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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090021 * Alan Cox : Super /proc >4K
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 * 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.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090039 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 * 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
Eric Dumazetbb1d23b2005-07-05 15:00:32 -070055 * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes.
Ilia Sotnikovcef26852006-03-25 01:38:55 -080056 * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect
57 * Ilia Sotnikov : Removed TOS from hash calculations
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/mm.h>
Eric Dumazet424c4b72005-07-05 14:58:19 -070072#include <linux/bootmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#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>
Eric Dumazet39c90ec2007-09-15 10:55:54 -070082#include <linux/workqueue.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#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>
Herbert Xu352e5122007-11-13 21:34:06 -080093#include <net/dst.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020094#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <net/protocol.h>
96#include <net/ip.h>
97#include <net/route.h>
98#include <net/inetpeer.h>
99#include <net/sock.h>
100#include <net/ip_fib.h>
101#include <net/arp.h>
102#include <net/tcp.h>
103#include <net/icmp.h>
104#include <net/xfrm.h>
Tom Tucker8d717402006-07-30 20:43:36 -0700105#include <net/netevent.h>
Thomas Graf63f34442007-03-22 11:55:17 -0700106#include <net/rtnetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#ifdef CONFIG_SYSCTL
108#include <linux/sysctl.h>
109#endif
110
111#define RT_FL_TOS(oldflp) \
112 ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK)))
113
114#define IP_MAX_MTU 0xFFF0
115
116#define RT_GC_TIMEOUT (300*HZ)
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118static int ip_rt_max_size;
Stephen Hemminger817bc4d2008-03-22 17:43:59 -0700119static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT;
120static int ip_rt_gc_interval __read_mostly = 60 * HZ;
121static int ip_rt_gc_min_interval __read_mostly = HZ / 2;
122static int ip_rt_redirect_number __read_mostly = 9;
123static int ip_rt_redirect_load __read_mostly = HZ / 50;
124static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1));
125static int ip_rt_error_cost __read_mostly = HZ;
126static int ip_rt_error_burst __read_mostly = 5 * HZ;
127static int ip_rt_gc_elasticity __read_mostly = 8;
128static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ;
129static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20;
130static int ip_rt_min_advmss __read_mostly = 256;
131static int ip_rt_secret_interval __read_mostly = 10 * 60 * HZ;
Neil Horman1080d702008-10-27 12:28:25 -0700132static int rt_chain_length_max __read_mostly = 20;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Eric Dumazet125bb8f2009-06-11 20:10:07 +0000134static struct delayed_work expires_work;
135static unsigned long expires_ljiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137/*
138 * Interface to generic destination cache.
139 */
140
141static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie);
142static void ipv4_dst_destroy(struct dst_entry *dst);
143static void ipv4_dst_ifdown(struct dst_entry *dst,
144 struct net_device *dev, int how);
145static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst);
146static void ipv4_link_failure(struct sk_buff *skb);
147static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
Daniel Lezcano569d3642008-01-18 03:56:57 -0800148static int rt_garbage_collect(struct dst_ops *ops);
Neil Horman1080d702008-10-27 12:28:25 -0700149static void rt_emergency_hash_rebuild(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151
152static struct dst_ops ipv4_dst_ops = {
153 .family = AF_INET,
Harvey Harrison09640e62009-02-01 00:45:17 -0800154 .protocol = cpu_to_be16(ETH_P_IP),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 .gc = rt_garbage_collect,
156 .check = ipv4_dst_check,
157 .destroy = ipv4_dst_destroy,
158 .ifdown = ipv4_dst_ifdown,
159 .negative_advice = ipv4_negative_advice,
160 .link_failure = ipv4_link_failure,
161 .update_pmtu = ip_rt_update_pmtu,
Herbert Xu1ac06e02008-05-20 14:32:14 -0700162 .local_out = __ip_local_out,
Eric Dumazete2422972008-01-30 20:07:45 -0800163 .entries = ATOMIC_INIT(0),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164};
165
166#define ECN_OR_COST(class) TC_PRIO_##class
167
Philippe De Muyter4839c522007-07-09 15:32:57 -0700168const __u8 ip_tos2prio[16] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 TC_PRIO_BESTEFFORT,
170 ECN_OR_COST(FILLER),
171 TC_PRIO_BESTEFFORT,
172 ECN_OR_COST(BESTEFFORT),
173 TC_PRIO_BULK,
174 ECN_OR_COST(BULK),
175 TC_PRIO_BULK,
176 ECN_OR_COST(BULK),
177 TC_PRIO_INTERACTIVE,
178 ECN_OR_COST(INTERACTIVE),
179 TC_PRIO_INTERACTIVE,
180 ECN_OR_COST(INTERACTIVE),
181 TC_PRIO_INTERACTIVE_BULK,
182 ECN_OR_COST(INTERACTIVE_BULK),
183 TC_PRIO_INTERACTIVE_BULK,
184 ECN_OR_COST(INTERACTIVE_BULK)
185};
186
187
188/*
189 * Route cache.
190 */
191
192/* The locking scheme is rather straight forward:
193 *
194 * 1) Read-Copy Update protects the buckets of the central route hash.
195 * 2) Only writers remove entries, and they hold the lock
196 * as they look at rtable reference counts.
197 * 3) Only readers acquire references to rtable entries,
198 * they do so with atomic increments and with the
199 * lock held.
200 */
201
202struct rt_hash_bucket {
203 struct rtable *chain;
Eric Dumazet22c047c2005-07-05 14:55:24 -0700204};
Neil Horman1080d702008-10-27 12:28:25 -0700205
Ingo Molnar8a25d5d2006-07-03 00:24:54 -0700206#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \
207 defined(CONFIG_PROVE_LOCKING)
Eric Dumazet22c047c2005-07-05 14:55:24 -0700208/*
209 * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks
210 * The size of this table is a power of two and depends on the number of CPUS.
Ingo Molnar62051202006-07-03 00:24:59 -0700211 * (on lockdep we have a quite big spinlock_t, so keep the size down there)
Eric Dumazet22c047c2005-07-05 14:55:24 -0700212 */
Ingo Molnar62051202006-07-03 00:24:59 -0700213#ifdef CONFIG_LOCKDEP
214# define RT_HASH_LOCK_SZ 256
Eric Dumazet22c047c2005-07-05 14:55:24 -0700215#else
Ingo Molnar62051202006-07-03 00:24:59 -0700216# if NR_CPUS >= 32
217# define RT_HASH_LOCK_SZ 4096
218# elif NR_CPUS >= 16
219# define RT_HASH_LOCK_SZ 2048
220# elif NR_CPUS >= 8
221# define RT_HASH_LOCK_SZ 1024
222# elif NR_CPUS >= 4
223# define RT_HASH_LOCK_SZ 512
224# else
225# define RT_HASH_LOCK_SZ 256
226# endif
Eric Dumazet22c047c2005-07-05 14:55:24 -0700227#endif
228
229static spinlock_t *rt_hash_locks;
230# define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)]
Pavel Emelyanov1ff1cc22007-12-05 21:15:05 -0800231
232static __init void rt_hash_lock_init(void)
233{
234 int i;
235
236 rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ,
237 GFP_KERNEL);
238 if (!rt_hash_locks)
239 panic("IP: failed to allocate rt_hash_locks\n");
240
241 for (i = 0; i < RT_HASH_LOCK_SZ; i++)
242 spin_lock_init(&rt_hash_locks[i]);
243}
Eric Dumazet22c047c2005-07-05 14:55:24 -0700244#else
245# define rt_hash_lock_addr(slot) NULL
Pavel Emelyanov1ff1cc22007-12-05 21:15:05 -0800246
247static inline void rt_hash_lock_init(void)
248{
249}
Eric Dumazet22c047c2005-07-05 14:55:24 -0700250#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Stephen Hemminger817bc4d2008-03-22 17:43:59 -0700252static struct rt_hash_bucket *rt_hash_table __read_mostly;
253static unsigned rt_hash_mask __read_mostly;
254static unsigned int rt_hash_log __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Eric Dumazet2f970d82006-01-17 02:54:36 -0800256static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
Andrew Mortondbd29152006-01-17 21:58:01 -0800257#define RT_CACHE_STAT_INC(field) \
Paul Mackerrasbfe5d832006-06-25 05:47:14 -0700258 (__raw_get_cpu_var(rt_cache_stat).field++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Denis V. Lunevb00180d2008-07-05 19:04:09 -0700260static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx,
261 int genid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Stephen Hemminger1294fc42008-04-10 01:54:01 -0700263 return jhash_3words((__force u32)(__be32)(daddr),
264 (__force u32)(__be32)(saddr),
Denis V. Lunevb00180d2008-07-05 19:04:09 -0700265 idx, genid)
Eric Dumazet29e75252008-01-31 17:05:09 -0800266 & rt_hash_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
268
Denis V. Luneve84f84f2008-07-05 19:04:32 -0700269static inline int rt_genid(struct net *net)
270{
271 return atomic_read(&net->ipv4.rt_genid);
272}
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274#ifdef CONFIG_PROC_FS
275struct rt_cache_iter_state {
Denis V. Luneva75e9362008-02-28 20:50:55 -0800276 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 int bucket;
Eric Dumazet29e75252008-01-31 17:05:09 -0800278 int genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279};
280
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900281static struct rtable *rt_cache_get_first(struct seq_file *seq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900283 struct rt_cache_iter_state *st = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 struct rtable *r = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) {
Eric Dumazeta6272662008-08-28 01:11:25 -0700287 if (!rt_hash_table[st->bucket].chain)
288 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 rcu_read_lock_bh();
Eric Dumazet29e75252008-01-31 17:05:09 -0800290 r = rcu_dereference(rt_hash_table[st->bucket].chain);
291 while (r) {
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900292 if (dev_net(r->u.dst.dev) == seq_file_net(seq) &&
Denis V. Luneva75e9362008-02-28 20:50:55 -0800293 r->rt_genid == st->genid)
Eric Dumazet29e75252008-01-31 17:05:09 -0800294 return r;
295 r = rcu_dereference(r->u.dst.rt_next);
296 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 rcu_read_unlock_bh();
298 }
Eric Dumazet29e75252008-01-31 17:05:09 -0800299 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900302static struct rtable *__rt_cache_get_next(struct seq_file *seq,
Denis V. Lunev642d6312008-02-28 20:50:33 -0800303 struct rtable *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900305 struct rt_cache_iter_state *st = seq->private;
Eric Dumazeta6272662008-08-28 01:11:25 -0700306
Eric Dumazet093c2ca2007-02-09 16:19:26 -0800307 r = r->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 while (!r) {
309 rcu_read_unlock_bh();
Eric Dumazeta6272662008-08-28 01:11:25 -0700310 do {
311 if (--st->bucket < 0)
312 return NULL;
313 } while (!rt_hash_table[st->bucket].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 rcu_read_lock_bh();
315 r = rt_hash_table[st->bucket].chain;
316 }
Eric Dumazet0bccead2008-01-10 03:55:57 -0800317 return rcu_dereference(r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318}
319
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900320static struct rtable *rt_cache_get_next(struct seq_file *seq,
Denis V. Lunev642d6312008-02-28 20:50:33 -0800321 struct rtable *r)
322{
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900323 struct rt_cache_iter_state *st = seq->private;
324 while ((r = __rt_cache_get_next(seq, r)) != NULL) {
325 if (dev_net(r->u.dst.dev) != seq_file_net(seq))
Denis V. Luneva75e9362008-02-28 20:50:55 -0800326 continue;
Denis V. Lunev642d6312008-02-28 20:50:33 -0800327 if (r->rt_genid == st->genid)
328 break;
329 }
330 return r;
331}
332
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900333static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900335 struct rtable *r = rt_cache_get_first(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 if (r)
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900338 while (pos && (r = rt_cache_get_next(seq, r)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 --pos;
340 return pos ? NULL : r;
341}
342
343static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
344{
Eric Dumazet29e75252008-01-31 17:05:09 -0800345 struct rt_cache_iter_state *st = seq->private;
Eric Dumazet29e75252008-01-31 17:05:09 -0800346 if (*pos)
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900347 return rt_cache_get_idx(seq, *pos - 1);
Denis V. Luneve84f84f2008-07-05 19:04:32 -0700348 st->genid = rt_genid(seq_file_net(seq));
Eric Dumazet29e75252008-01-31 17:05:09 -0800349 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
351
352static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
353{
Eric Dumazet29e75252008-01-31 17:05:09 -0800354 struct rtable *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 if (v == SEQ_START_TOKEN)
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900357 r = rt_cache_get_first(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 else
YOSHIFUJI Hideaki12188542008-03-26 02:36:06 +0900359 r = rt_cache_get_next(seq, v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 ++*pos;
361 return r;
362}
363
364static void rt_cache_seq_stop(struct seq_file *seq, void *v)
365{
366 if (v && v != SEQ_START_TOKEN)
367 rcu_read_unlock_bh();
368}
369
370static int rt_cache_seq_show(struct seq_file *seq, void *v)
371{
372 if (v == SEQ_START_TOKEN)
373 seq_printf(seq, "%-127s\n",
374 "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t"
375 "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t"
376 "HHUptod\tSpecDst");
377 else {
378 struct rtable *r = v;
Pavel Emelyanov5e659e42008-04-24 01:02:16 -0700379 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Pavel Emelyanov5e659e42008-04-24 01:02:16 -0700381 seq_printf(seq, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t"
382 "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 r->u.dst.dev ? r->u.dst.dev->name : "*",
384 (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway,
385 r->rt_flags, atomic_read(&r->u.dst.__refcnt),
386 r->u.dst.__use, 0, (unsigned long)r->rt_src,
387 (dst_metric(&r->u.dst, RTAX_ADVMSS) ?
388 (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0),
389 dst_metric(&r->u.dst, RTAX_WINDOW),
390 (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) +
391 dst_metric(&r->u.dst, RTAX_RTTVAR)),
392 r->fl.fl4_tos,
393 r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1,
394 r->u.dst.hh ? (r->u.dst.hh->hh_output ==
395 dev_queue_xmit) : 0,
Pavel Emelyanov5e659e42008-04-24 01:02:16 -0700396 r->rt_spec_dst, &len);
397
398 seq_printf(seq, "%*s\n", 127 - len, "");
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900399 }
400 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401}
402
Stephen Hemmingerf6908082007-03-12 14:34:29 -0700403static const struct seq_operations rt_cache_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 .start = rt_cache_seq_start,
405 .next = rt_cache_seq_next,
406 .stop = rt_cache_seq_stop,
407 .show = rt_cache_seq_show,
408};
409
410static int rt_cache_seq_open(struct inode *inode, struct file *file)
411{
Denis V. Luneva75e9362008-02-28 20:50:55 -0800412 return seq_open_net(inode, file, &rt_cache_seq_ops,
Pavel Emelyanovcf7732e2007-10-10 02:29:29 -0700413 sizeof(struct rt_cache_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
415
Arjan van de Ven9a321442007-02-12 00:55:35 -0800416static const struct file_operations rt_cache_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 .owner = THIS_MODULE,
418 .open = rt_cache_seq_open,
419 .read = seq_read,
420 .llseek = seq_lseek,
Denis V. Luneva75e9362008-02-28 20:50:55 -0800421 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422};
423
424
425static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos)
426{
427 int cpu;
428
429 if (*pos == 0)
430 return SEQ_START_TOKEN;
431
Rusty Russell0f23174a2008-12-29 12:23:42 +0000432 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 if (!cpu_possible(cpu))
434 continue;
435 *pos = cpu+1;
Eric Dumazet2f970d82006-01-17 02:54:36 -0800436 return &per_cpu(rt_cache_stat, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 }
438 return NULL;
439}
440
441static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
442{
443 int cpu;
444
Rusty Russell0f23174a2008-12-29 12:23:42 +0000445 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (!cpu_possible(cpu))
447 continue;
448 *pos = cpu+1;
Eric Dumazet2f970d82006-01-17 02:54:36 -0800449 return &per_cpu(rt_cache_stat, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
451 return NULL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455static void rt_cpu_seq_stop(struct seq_file *seq, void *v)
456{
457
458}
459
460static int rt_cpu_seq_show(struct seq_file *seq, void *v)
461{
462 struct rt_cache_stat *st = v;
463
464 if (v == SEQ_START_TOKEN) {
Olaf Rempel5bec0032005-04-28 12:16:08 -0700465 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");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return 0;
467 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x "
470 " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n",
471 atomic_read(&ipv4_dst_ops.entries),
472 st->in_hit,
473 st->in_slow_tot,
474 st->in_slow_mc,
475 st->in_no_route,
476 st->in_brd,
477 st->in_martian_dst,
478 st->in_martian_src,
479
480 st->out_hit,
481 st->out_slow_tot,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900482 st->out_slow_mc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 st->gc_total,
485 st->gc_ignored,
486 st->gc_goal_miss,
487 st->gc_dst_overflow,
488 st->in_hlist_search,
489 st->out_hlist_search
490 );
491 return 0;
492}
493
Stephen Hemmingerf6908082007-03-12 14:34:29 -0700494static const struct seq_operations rt_cpu_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 .start = rt_cpu_seq_start,
496 .next = rt_cpu_seq_next,
497 .stop = rt_cpu_seq_stop,
498 .show = rt_cpu_seq_show,
499};
500
501
502static int rt_cpu_seq_open(struct inode *inode, struct file *file)
503{
504 return seq_open(file, &rt_cpu_seq_ops);
505}
506
Arjan van de Ven9a321442007-02-12 00:55:35 -0800507static const struct file_operations rt_cpu_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 .owner = THIS_MODULE,
509 .open = rt_cpu_seq_open,
510 .read = seq_read,
511 .llseek = seq_lseek,
512 .release = seq_release,
513};
514
Pavel Emelyanov78c686e2007-12-05 21:13:48 -0800515#ifdef CONFIG_NET_CLS_ROUTE
516static int ip_rt_acct_read(char *buffer, char **start, off_t offset,
517 int length, int *eof, void *data)
518{
519 unsigned int i;
520
521 if ((offset & 3) || (length & 3))
522 return -EIO;
523
524 if (offset >= sizeof(struct ip_rt_acct) * 256) {
525 *eof = 1;
526 return 0;
527 }
528
529 if (offset + length >= sizeof(struct ip_rt_acct) * 256) {
530 length = sizeof(struct ip_rt_acct) * 256 - offset;
531 *eof = 1;
532 }
533
534 offset /= sizeof(u32);
535
536 if (length > 0) {
537 u32 *dst = (u32 *) buffer;
538
539 *start = buffer;
540 memset(dst, 0, length);
541
542 for_each_possible_cpu(i) {
543 unsigned int j;
544 u32 *src;
545
546 src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset;
547 for (j = 0; j < length/4; j++)
548 dst[j] += src[j];
549 }
550 }
551 return length;
552}
553#endif
Pavel Emelyanov107f1632007-12-05 21:14:28 -0800554
Denis V. Lunev73b38712008-02-28 20:51:18 -0800555static int __net_init ip_rt_do_proc_init(struct net *net)
Pavel Emelyanov107f1632007-12-05 21:14:28 -0800556{
557 struct proc_dir_entry *pde;
558
559 pde = proc_net_fops_create(net, "rt_cache", S_IRUGO,
560 &rt_cache_seq_fops);
561 if (!pde)
562 goto err1;
563
Wang Chen77020722008-02-28 14:14:25 -0800564 pde = proc_create("rt_cache", S_IRUGO,
565 net->proc_net_stat, &rt_cpu_seq_fops);
Pavel Emelyanov107f1632007-12-05 21:14:28 -0800566 if (!pde)
567 goto err2;
568
Pavel Emelyanov107f1632007-12-05 21:14:28 -0800569#ifdef CONFIG_NET_CLS_ROUTE
570 pde = create_proc_read_entry("rt_acct", 0, net->proc_net,
571 ip_rt_acct_read, NULL);
572 if (!pde)
573 goto err3;
574#endif
575 return 0;
576
577#ifdef CONFIG_NET_CLS_ROUTE
578err3:
579 remove_proc_entry("rt_cache", net->proc_net_stat);
580#endif
581err2:
582 remove_proc_entry("rt_cache", net->proc_net);
583err1:
584 return -ENOMEM;
585}
Denis V. Lunev73b38712008-02-28 20:51:18 -0800586
587static void __net_exit ip_rt_do_proc_exit(struct net *net)
588{
589 remove_proc_entry("rt_cache", net->proc_net_stat);
590 remove_proc_entry("rt_cache", net->proc_net);
591 remove_proc_entry("rt_acct", net->proc_net);
592}
593
594static struct pernet_operations ip_rt_proc_ops __net_initdata = {
595 .init = ip_rt_do_proc_init,
596 .exit = ip_rt_do_proc_exit,
597};
598
599static int __init ip_rt_proc_init(void)
600{
601 return register_pernet_subsys(&ip_rt_proc_ops);
602}
603
Pavel Emelyanov107f1632007-12-05 21:14:28 -0800604#else
Denis V. Lunev73b38712008-02-28 20:51:18 -0800605static inline int ip_rt_proc_init(void)
Pavel Emelyanov107f1632007-12-05 21:14:28 -0800606{
607 return 0;
608}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609#endif /* CONFIG_PROC_FS */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900610
Stephen Hemminger5969f712008-04-10 01:52:09 -0700611static inline void rt_free(struct rtable *rt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
614}
615
Stephen Hemminger5969f712008-04-10 01:52:09 -0700616static inline void rt_drop(struct rtable *rt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 ip_rt_put(rt);
619 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
620}
621
Stephen Hemminger5969f712008-04-10 01:52:09 -0700622static inline int rt_fast_clean(struct rtable *rth)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623{
624 /* Kill broadcast/multicast entries very aggresively, if they
625 collide in hash table with more useful entries */
626 return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
Eric Dumazet093c2ca2007-02-09 16:19:26 -0800627 rth->fl.iif && rth->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628}
629
Stephen Hemminger5969f712008-04-10 01:52:09 -0700630static inline int rt_valuable(struct rtable *rth)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
632 return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) ||
633 rth->u.dst.expires;
634}
635
636static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2)
637{
638 unsigned long age;
639 int ret = 0;
640
641 if (atomic_read(&rth->u.dst.__refcnt))
642 goto out;
643
644 ret = 1;
645 if (rth->u.dst.expires &&
646 time_after_eq(jiffies, rth->u.dst.expires))
647 goto out;
648
649 age = jiffies - rth->u.dst.lastuse;
650 ret = 0;
651 if ((age <= tmo1 && !rt_fast_clean(rth)) ||
652 (age <= tmo2 && rt_valuable(rth)))
653 goto out;
654 ret = 1;
655out: return ret;
656}
657
658/* Bits of score are:
659 * 31: very valuable
660 * 30: not quite useless
661 * 29..0: usage counter
662 */
663static inline u32 rt_score(struct rtable *rt)
664{
665 u32 score = jiffies - rt->u.dst.lastuse;
666
667 score = ~score & ~(3<<30);
668
669 if (rt_valuable(rt))
670 score |= (1<<31);
671
672 if (!rt->fl.iif ||
673 !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL)))
674 score |= (1<<30);
675
676 return score;
677}
678
Neil Horman1080d702008-10-27 12:28:25 -0700679static inline bool rt_caching(const struct net *net)
680{
681 return net->ipv4.current_rt_cache_rebuild_count <=
682 net->ipv4.sysctl_rt_cache_rebuild_count;
683}
684
685static inline bool compare_hash_inputs(const struct flowi *fl1,
686 const struct flowi *fl2)
687{
688 return (__force u32)(((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) |
689 (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr) |
690 (fl1->iif ^ fl2->iif)) == 0);
691}
692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
694{
Al Viro714e85b2006-11-14 20:51:49 -0800695 return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) |
696 (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) |
Thomas Graf47dcf0c2006-11-09 15:20:38 -0800697 (fl1->mark ^ fl2->mark) |
David S. Miller8238b212006-10-12 00:49:15 -0700698 (*(u16 *)&fl1->nl_u.ip4_u.tos ^
699 *(u16 *)&fl2->nl_u.ip4_u.tos) |
700 (fl1->oif ^ fl2->oif) |
701 (fl1->iif ^ fl2->iif)) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702}
703
Denis V. Lunevb5921912008-01-22 23:50:25 -0800704static inline int compare_netns(struct rtable *rt1, struct rtable *rt2)
705{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900706 return dev_net(rt1->u.dst.dev) == dev_net(rt2->u.dst.dev);
Denis V. Lunevb5921912008-01-22 23:50:25 -0800707}
708
Denis V. Luneve84f84f2008-07-05 19:04:32 -0700709static inline int rt_is_expired(struct rtable *rth)
710{
711 return rth->rt_genid != rt_genid(dev_net(rth->u.dst.dev));
712}
713
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800714/*
715 * Perform a full scan of hash table and free all entries.
716 * Can be called by a softirq or a process.
717 * In the later case, we want to be reschedule if necessary
718 */
719static void rt_do_flush(int process_context)
720{
721 unsigned int i;
722 struct rtable *rth, *next;
Denis V. Lunev32cb5b42008-07-05 19:06:12 -0700723 struct rtable * tail;
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800724
725 for (i = 0; i <= rt_hash_mask; i++) {
726 if (process_context && need_resched())
727 cond_resched();
728 rth = rt_hash_table[i].chain;
729 if (!rth)
730 continue;
731
732 spin_lock_bh(rt_hash_lock_addr(i));
Denis V. Lunev32cb5b42008-07-05 19:06:12 -0700733#ifdef CONFIG_NET_NS
734 {
735 struct rtable ** prev, * p;
736
737 rth = rt_hash_table[i].chain;
738
739 /* defer releasing the head of the list after spin_unlock */
740 for (tail = rth; tail; tail = tail->u.dst.rt_next)
741 if (!rt_is_expired(tail))
742 break;
743 if (rth != tail)
744 rt_hash_table[i].chain = tail;
745
746 /* call rt_free on entries after the tail requiring flush */
747 prev = &rt_hash_table[i].chain;
748 for (p = *prev; p; p = next) {
749 next = p->u.dst.rt_next;
750 if (!rt_is_expired(p)) {
751 prev = &p->u.dst.rt_next;
752 } else {
753 *prev = next;
754 rt_free(p);
755 }
756 }
757 }
758#else
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800759 rth = rt_hash_table[i].chain;
760 rt_hash_table[i].chain = NULL;
Denis V. Lunev32cb5b42008-07-05 19:06:12 -0700761 tail = NULL;
762#endif
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800763 spin_unlock_bh(rt_hash_lock_addr(i));
764
Denis V. Lunev32cb5b42008-07-05 19:06:12 -0700765 for (; rth != tail; rth = next) {
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800766 next = rth->u.dst.rt_next;
767 rt_free(rth);
768 }
769 }
770}
771
Neil Horman1080d702008-10-27 12:28:25 -0700772/*
773 * While freeing expired entries, we compute average chain length
774 * and standard deviation, using fixed-point arithmetic.
775 * This to have an estimation of rt_chain_length_max
776 * rt_chain_length_max = max(elasticity, AVG + 4*SD)
777 * We use 3 bits for frational part, and 29 (or 61) for magnitude.
778 */
779
780#define FRACT_BITS 3
781#define ONE (1UL << FRACT_BITS)
782
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800783static void rt_check_expire(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784{
Eric Dumazetbb1d23b2005-07-05 15:00:32 -0700785 static unsigned int rover;
786 unsigned int i = rover, goal;
Eric Dumazet1ddbcb02009-05-19 20:14:28 +0000787 struct rtable *rth, *aux, **rthp;
Eric Dumazetcf8da762009-05-19 18:54:22 +0000788 unsigned long samples = 0;
Neil Horman1080d702008-10-27 12:28:25 -0700789 unsigned long sum = 0, sum2 = 0;
Eric Dumazet125bb8f2009-06-11 20:10:07 +0000790 unsigned long delta;
Eric Dumazetbb1d23b2005-07-05 15:00:32 -0700791 u64 mult;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
Eric Dumazet125bb8f2009-06-11 20:10:07 +0000793 delta = jiffies - expires_ljiffies;
794 expires_ljiffies = jiffies;
795 mult = ((u64)delta) << rt_hash_log;
Eric Dumazetbb1d23b2005-07-05 15:00:32 -0700796 if (ip_rt_gc_timeout > 1)
797 do_div(mult, ip_rt_gc_timeout);
798 goal = (unsigned int)mult;
Eric Dumazet39c90ec2007-09-15 10:55:54 -0700799 if (goal > rt_hash_mask)
800 goal = rt_hash_mask + 1;
Eric Dumazetbb1d23b2005-07-05 15:00:32 -0700801 for (; goal > 0; goal--) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 unsigned long tmo = ip_rt_gc_timeout;
Eric Dumazetcf8da762009-05-19 18:54:22 +0000803 unsigned long length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 i = (i + 1) & rt_hash_mask;
806 rthp = &rt_hash_table[i].chain;
807
Eric Dumazetd90bf5a2007-11-14 16:14:05 -0800808 if (need_resched())
809 cond_resched();
810
Neil Horman1080d702008-10-27 12:28:25 -0700811 samples++;
812
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700813 if (*rthp == NULL)
Eric Dumazetbb1d23b2005-07-05 15:00:32 -0700814 continue;
Eric Dumazetcf8da762009-05-19 18:54:22 +0000815 length = 0;
Eric Dumazet39c90ec2007-09-15 10:55:54 -0700816 spin_lock_bh(rt_hash_lock_addr(i));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 while ((rth = *rthp) != NULL) {
Eric Dumazet1ddbcb02009-05-19 20:14:28 +0000818 prefetch(rth->u.dst.rt_next);
Denis V. Luneve84f84f2008-07-05 19:04:32 -0700819 if (rt_is_expired(rth)) {
Eric Dumazet29e75252008-01-31 17:05:09 -0800820 *rthp = rth->u.dst.rt_next;
821 rt_free(rth);
822 continue;
823 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 if (rth->u.dst.expires) {
825 /* Entry is expired even if it is in use */
Eric Dumazet39c90ec2007-09-15 10:55:54 -0700826 if (time_before_eq(jiffies, rth->u.dst.expires)) {
Eric Dumazet1ddbcb02009-05-19 20:14:28 +0000827nofree:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 tmo >>= 1;
Eric Dumazet093c2ca2007-02-09 16:19:26 -0800829 rthp = &rth->u.dst.rt_next;
Neil Horman1080d702008-10-27 12:28:25 -0700830 /*
Eric Dumazet1ddbcb02009-05-19 20:14:28 +0000831 * We only count entries on
Neil Horman1080d702008-10-27 12:28:25 -0700832 * a chain with equal hash inputs once
833 * so that entries for different QOS
834 * levels, and other non-hash input
835 * attributes don't unfairly skew
836 * the length computation
837 */
Eric Dumazet1ddbcb02009-05-19 20:14:28 +0000838 for (aux = rt_hash_table[i].chain;;) {
839 if (aux == rth) {
840 length += ONE;
841 break;
842 }
843 if (compare_hash_inputs(&aux->fl, &rth->fl))
844 break;
845 aux = aux->u.dst.rt_next;
846 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 continue;
848 }
Eric Dumazet1ddbcb02009-05-19 20:14:28 +0000849 } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout))
850 goto nofree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
852 /* Cleanup aged off entries. */
Eric Dumazet093c2ca2007-02-09 16:19:26 -0800853 *rthp = rth->u.dst.rt_next;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900854 rt_free(rth);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 }
Eric Dumazet39c90ec2007-09-15 10:55:54 -0700856 spin_unlock_bh(rt_hash_lock_addr(i));
Neil Horman1080d702008-10-27 12:28:25 -0700857 sum += length;
858 sum2 += length*length;
859 }
860 if (samples) {
861 unsigned long avg = sum / samples;
862 unsigned long sd = int_sqrt(sum2 / samples - avg*avg);
863 rt_chain_length_max = max_t(unsigned long,
864 ip_rt_gc_elasticity,
865 (avg + 4*sd) >> FRACT_BITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 }
867 rover = i;
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800868}
869
870/*
871 * rt_worker_func() is run in process context.
Eric Dumazet29e75252008-01-31 17:05:09 -0800872 * we call rt_check_expire() to scan part of the hash table
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800873 */
874static void rt_worker_func(struct work_struct *work)
875{
Eric Dumazet29e75252008-01-31 17:05:09 -0800876 rt_check_expire();
Eric Dumazet39c90ec2007-09-15 10:55:54 -0700877 schedule_delayed_work(&expires_work, ip_rt_gc_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878}
879
Eric Dumazet29e75252008-01-31 17:05:09 -0800880/*
881 * Pertubation of rt_genid by a small quantity [1..256]
882 * Using 8 bits of shuffling ensure we can call rt_cache_invalidate()
883 * many times (2^24) without giving recent rt_genid.
884 * Jenkins hash is strong enough that litle changes of rt_genid are OK.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 */
Denis V. Lunev86c657f2008-07-05 19:03:31 -0700886static void rt_cache_invalidate(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
Eric Dumazet29e75252008-01-31 17:05:09 -0800888 unsigned char shuffle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Eric Dumazet29e75252008-01-31 17:05:09 -0800890 get_random_bytes(&shuffle, sizeof(shuffle));
Denis V. Luneve84f84f2008-07-05 19:04:32 -0700891 atomic_add(shuffle + 1U, &net->ipv4.rt_genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892}
893
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800894/*
Eric Dumazet29e75252008-01-31 17:05:09 -0800895 * delay < 0 : invalidate cache (fast : entries will be deleted later)
896 * delay >= 0 : invalidate & flush cache (can be long)
897 */
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -0700898void rt_cache_flush(struct net *net, int delay)
Eric Dumazet29e75252008-01-31 17:05:09 -0800899{
Denis V. Lunev86c657f2008-07-05 19:03:31 -0700900 rt_cache_invalidate(net);
Eric Dumazet29e75252008-01-31 17:05:09 -0800901 if (delay >= 0)
902 rt_do_flush(!in_softirq());
903}
904
905/*
906 * We change rt_genid and let gc do the cleanup
Eric Dumazetbeb659b2007-11-19 22:43:37 -0800907 */
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -0700908static void rt_secret_rebuild(unsigned long __net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909{
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -0700910 struct net *net = (struct net *)__net;
Denis V. Lunev86c657f2008-07-05 19:03:31 -0700911 rt_cache_invalidate(net);
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -0700912 mod_timer(&net->ipv4.rt_secret_timer, jiffies + ip_rt_secret_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913}
914
Neil Horman1080d702008-10-27 12:28:25 -0700915static void rt_secret_rebuild_oneshot(struct net *net)
916{
917 del_timer_sync(&net->ipv4.rt_secret_timer);
918 rt_cache_invalidate(net);
919 if (ip_rt_secret_interval) {
920 net->ipv4.rt_secret_timer.expires += ip_rt_secret_interval;
921 add_timer(&net->ipv4.rt_secret_timer);
922 }
923}
924
925static void rt_emergency_hash_rebuild(struct net *net)
926{
927 if (net_ratelimit()) {
928 printk(KERN_WARNING "Route hash chain too long!\n");
929 printk(KERN_WARNING "Adjust your secret_interval!\n");
930 }
931
932 rt_secret_rebuild_oneshot(net);
933}
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935/*
936 Short description of GC goals.
937
938 We want to build algorithm, which will keep routing cache
939 at some equilibrium point, when number of aged off entries
940 is kept approximately equal to newly generated ones.
941
942 Current expiration strength is variable "expire".
943 We try to adjust it dynamically, so that if networking
944 is idle expires is large enough to keep enough of warm entries,
945 and when load increases it reduces to limit cache size.
946 */
947
Daniel Lezcano569d3642008-01-18 03:56:57 -0800948static int rt_garbage_collect(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
950 static unsigned long expire = RT_GC_TIMEOUT;
951 static unsigned long last_gc;
952 static int rover;
953 static int equilibrium;
954 struct rtable *rth, **rthp;
955 unsigned long now = jiffies;
956 int goal;
957
958 /*
959 * Garbage collection is pretty expensive,
960 * do not make it too frequently.
961 */
962
963 RT_CACHE_STAT_INC(gc_total);
964
965 if (now - last_gc < ip_rt_gc_min_interval &&
966 atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) {
967 RT_CACHE_STAT_INC(gc_ignored);
968 goto out;
969 }
970
971 /* Calculate number of entries, which we want to expire now. */
972 goal = atomic_read(&ipv4_dst_ops.entries) -
973 (ip_rt_gc_elasticity << rt_hash_log);
974 if (goal <= 0) {
975 if (equilibrium < ipv4_dst_ops.gc_thresh)
976 equilibrium = ipv4_dst_ops.gc_thresh;
977 goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium;
978 if (goal > 0) {
Eric Dumazetb790ced2007-12-21 01:49:07 -0800979 equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium;
981 }
982 } else {
983 /* We are in dangerous area. Try to reduce cache really
984 * aggressively.
985 */
Eric Dumazetb790ced2007-12-21 01:49:07 -0800986 goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal;
988 }
989
990 if (now - last_gc >= ip_rt_gc_min_interval)
991 last_gc = now;
992
993 if (goal <= 0) {
994 equilibrium += goal;
995 goto work_done;
996 }
997
998 do {
999 int i, k;
1000
1001 for (i = rt_hash_mask, k = rover; i >= 0; i--) {
1002 unsigned long tmo = expire;
1003
1004 k = (k + 1) & rt_hash_mask;
1005 rthp = &rt_hash_table[k].chain;
Eric Dumazet22c047c2005-07-05 14:55:24 -07001006 spin_lock_bh(rt_hash_lock_addr(k));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 while ((rth = *rthp) != NULL) {
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001008 if (!rt_is_expired(rth) &&
Eric Dumazet29e75252008-01-31 17:05:09 -08001009 !rt_may_expire(rth, tmo, expire)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 tmo >>= 1;
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001011 rthp = &rth->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 continue;
1013 }
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001014 *rthp = rth->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 rt_free(rth);
1016 goal--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 }
Eric Dumazet22c047c2005-07-05 14:55:24 -07001018 spin_unlock_bh(rt_hash_lock_addr(k));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (goal <= 0)
1020 break;
1021 }
1022 rover = k;
1023
1024 if (goal <= 0)
1025 goto work_done;
1026
1027 /* Goal is not achieved. We stop process if:
1028
1029 - if expire reduced to zero. Otherwise, expire is halfed.
1030 - if table is not full.
1031 - if we are called from interrupt.
1032 - jiffies check is just fallback/debug loop breaker.
1033 We will not spin here for long time in any case.
1034 */
1035
1036 RT_CACHE_STAT_INC(gc_goal_miss);
1037
1038 if (expire == 0)
1039 break;
1040
1041 expire >>= 1;
1042#if RT_CACHE_DEBUG >= 2
1043 printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire,
1044 atomic_read(&ipv4_dst_ops.entries), goal, i);
1045#endif
1046
1047 if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size)
1048 goto out;
1049 } while (!in_softirq() && time_before_eq(jiffies, now));
1050
1051 if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size)
1052 goto out;
1053 if (net_ratelimit())
1054 printk(KERN_WARNING "dst cache overflow\n");
1055 RT_CACHE_STAT_INC(gc_dst_overflow);
1056 return 1;
1057
1058work_done:
1059 expire += ip_rt_gc_min_interval;
1060 if (expire > ip_rt_gc_timeout ||
1061 atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh)
1062 expire = ip_rt_gc_timeout;
1063#if RT_CACHE_DEBUG >= 2
1064 printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire,
1065 atomic_read(&ipv4_dst_ops.entries), goal, rover);
1066#endif
1067out: return 0;
1068}
1069
Eric Dumazet511c3f92009-06-02 05:14:27 +00001070static int rt_intern_hash(unsigned hash, struct rtable *rt,
1071 struct rtable **rp, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072{
1073 struct rtable *rth, **rthp;
1074 unsigned long now;
1075 struct rtable *cand, **candp;
1076 u32 min_score;
1077 int chain_length;
1078 int attempts = !in_softirq();
1079
1080restart:
1081 chain_length = 0;
1082 min_score = ~(u32)0;
1083 cand = NULL;
1084 candp = NULL;
1085 now = jiffies;
1086
Neil Horman1080d702008-10-27 12:28:25 -07001087 if (!rt_caching(dev_net(rt->u.dst.dev))) {
Neil Horman73e42892009-06-20 01:15:16 -07001088 /*
1089 * If we're not caching, just tell the caller we
1090 * were successful and don't touch the route. The
1091 * caller hold the sole reference to the cache entry, and
1092 * it will be released when the caller is done with it.
1093 * If we drop it here, the callers have no way to resolve routes
1094 * when we're not caching. Instead, just point *rp at rt, so
1095 * the caller gets a single use out of the route
Neil Hormanb6280b42009-06-22 10:18:53 +00001096 * Note that we do rt_free on this new route entry, so that
1097 * once its refcount hits zero, we are still able to reap it
1098 * (Thanks Alexey)
1099 * Note also the rt_free uses call_rcu. We don't actually
1100 * need rcu protection here, this is just our path to get
1101 * on the route gc list.
Neil Horman73e42892009-06-20 01:15:16 -07001102 */
Neil Hormanb6280b42009-06-22 10:18:53 +00001103
1104 if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) {
1105 int err = arp_bind_neighbour(&rt->u.dst);
1106 if (err) {
1107 if (net_ratelimit())
1108 printk(KERN_WARNING
1109 "Neighbour table failure & not caching routes.\n");
1110 rt_drop(rt);
1111 return err;
1112 }
1113 }
1114
1115 rt_free(rt);
1116 goto skip_hashing;
Neil Horman1080d702008-10-27 12:28:25 -07001117 }
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 rthp = &rt_hash_table[hash].chain;
1120
Eric Dumazet22c047c2005-07-05 14:55:24 -07001121 spin_lock_bh(rt_hash_lock_addr(hash));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 while ((rth = *rthp) != NULL) {
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001123 if (rt_is_expired(rth)) {
Eric Dumazet29e75252008-01-31 17:05:09 -08001124 *rthp = rth->u.dst.rt_next;
1125 rt_free(rth);
1126 continue;
1127 }
Denis V. Lunevb5921912008-01-22 23:50:25 -08001128 if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 /* Put it first */
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001130 *rthp = rth->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 /*
1132 * Since lookup is lockfree, the deletion
1133 * must be visible to another weakly ordered CPU before
1134 * the insertion at the start of the hash chain.
1135 */
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001136 rcu_assign_pointer(rth->u.dst.rt_next,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 rt_hash_table[hash].chain);
1138 /*
1139 * Since lookup is lockfree, the update writes
1140 * must be ordered for consistency on SMP.
1141 */
1142 rcu_assign_pointer(rt_hash_table[hash].chain, rth);
1143
Pavel Emelyanov03f49f32007-11-10 21:28:34 -08001144 dst_use(&rth->u.dst, now);
Eric Dumazet22c047c2005-07-05 14:55:24 -07001145 spin_unlock_bh(rt_hash_lock_addr(hash));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
1147 rt_drop(rt);
Eric Dumazet511c3f92009-06-02 05:14:27 +00001148 if (rp)
1149 *rp = rth;
1150 else
Eric Dumazetadf30902009-06-02 05:19:30 +00001151 skb_dst_set(skb, &rth->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 return 0;
1153 }
1154
1155 if (!atomic_read(&rth->u.dst.__refcnt)) {
1156 u32 score = rt_score(rth);
1157
1158 if (score <= min_score) {
1159 cand = rth;
1160 candp = rthp;
1161 min_score = score;
1162 }
1163 }
1164
1165 chain_length++;
1166
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001167 rthp = &rth->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 }
1169
1170 if (cand) {
1171 /* ip_rt_gc_elasticity used to be average length of chain
1172 * length, when exceeded gc becomes really aggressive.
1173 *
1174 * The second limit is less certain. At the moment it allows
1175 * only 2 entries per bucket. We will see.
1176 */
1177 if (chain_length > ip_rt_gc_elasticity) {
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001178 *candp = cand->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 rt_free(cand);
1180 }
Neil Horman1080d702008-10-27 12:28:25 -07001181 } else {
1182 if (chain_length > rt_chain_length_max) {
1183 struct net *net = dev_net(rt->u.dst.dev);
1184 int num = ++net->ipv4.current_rt_cache_rebuild_count;
1185 if (!rt_caching(dev_net(rt->u.dst.dev))) {
1186 printk(KERN_WARNING "%s: %d rebuilds is over limit, route caching disabled\n",
1187 rt->u.dst.dev->name, num);
1188 }
1189 rt_emergency_hash_rebuild(dev_net(rt->u.dst.dev));
1190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 }
1192
1193 /* Try to bind route to arp only if it is output
1194 route or unicast forwarding path.
1195 */
1196 if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) {
1197 int err = arp_bind_neighbour(&rt->u.dst);
1198 if (err) {
Eric Dumazet22c047c2005-07-05 14:55:24 -07001199 spin_unlock_bh(rt_hash_lock_addr(hash));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
1201 if (err != -ENOBUFS) {
1202 rt_drop(rt);
1203 return err;
1204 }
1205
1206 /* Neighbour tables are full and nothing
1207 can be released. Try to shrink route cache,
1208 it is most likely it holds some neighbour records.
1209 */
1210 if (attempts-- > 0) {
1211 int saved_elasticity = ip_rt_gc_elasticity;
1212 int saved_int = ip_rt_gc_min_interval;
1213 ip_rt_gc_elasticity = 1;
1214 ip_rt_gc_min_interval = 0;
Daniel Lezcano569d3642008-01-18 03:56:57 -08001215 rt_garbage_collect(&ipv4_dst_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 ip_rt_gc_min_interval = saved_int;
1217 ip_rt_gc_elasticity = saved_elasticity;
1218 goto restart;
1219 }
1220
1221 if (net_ratelimit())
1222 printk(KERN_WARNING "Neighbour table overflow.\n");
1223 rt_drop(rt);
1224 return -ENOBUFS;
1225 }
1226 }
1227
Eric Dumazet1ddbcb02009-05-19 20:14:28 +00001228 rt->u.dst.rt_next = rt_hash_table[hash].chain;
Neil Horman1080d702008-10-27 12:28:25 -07001229
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230#if RT_CACHE_DEBUG >= 2
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001231 if (rt->u.dst.rt_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 struct rtable *trt;
Neil Hormanb6280b42009-06-22 10:18:53 +00001233 printk(KERN_DEBUG "rt_cache @%02x: %pI4",
1234 hash, &rt->rt_dst);
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001235 for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next)
Harvey Harrison673d57e2008-10-31 00:53:57 -07001236 printk(" . %pI4", &trt->rt_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 printk("\n");
1238 }
1239#endif
Eric Dumazet00269b52008-10-16 14:18:29 -07001240 /*
1241 * Since lookup is lockfree, we must make sure
1242 * previous writes to rt are comitted to memory
1243 * before making rt visible to other CPUS.
1244 */
Eric Dumazet1ddbcb02009-05-19 20:14:28 +00001245 rcu_assign_pointer(rt_hash_table[hash].chain, rt);
Neil Horman1080d702008-10-27 12:28:25 -07001246
Eric Dumazet22c047c2005-07-05 14:55:24 -07001247 spin_unlock_bh(rt_hash_lock_addr(hash));
Neil Horman73e42892009-06-20 01:15:16 -07001248
Neil Hormanb6280b42009-06-22 10:18:53 +00001249skip_hashing:
Eric Dumazet511c3f92009-06-02 05:14:27 +00001250 if (rp)
1251 *rp = rt;
1252 else
Eric Dumazetadf30902009-06-02 05:19:30 +00001253 skb_dst_set(skb, &rt->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 return 0;
1255}
1256
1257void rt_bind_peer(struct rtable *rt, int create)
1258{
1259 static DEFINE_SPINLOCK(rt_peer_lock);
1260 struct inet_peer *peer;
1261
1262 peer = inet_getpeer(rt->rt_dst, create);
1263
1264 spin_lock_bh(&rt_peer_lock);
1265 if (rt->peer == NULL) {
1266 rt->peer = peer;
1267 peer = NULL;
1268 }
1269 spin_unlock_bh(&rt_peer_lock);
1270 if (peer)
1271 inet_putpeer(peer);
1272}
1273
1274/*
1275 * Peer allocation may fail only in serious out-of-memory conditions. However
1276 * we still can generate some output.
1277 * Random ID selection looks a bit dangerous because we have no chances to
1278 * select ID being unique in a reasonable period of time.
1279 * But broken packet identifier may be better than no packet at all.
1280 */
1281static void ip_select_fb_ident(struct iphdr *iph)
1282{
1283 static DEFINE_SPINLOCK(ip_fb_id_lock);
1284 static u32 ip_fallback_id;
1285 u32 salt;
1286
1287 spin_lock_bh(&ip_fb_id_lock);
Al Viroe4485152006-09-26 22:15:01 -07001288 salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 iph->id = htons(salt & 0xFFFF);
1290 ip_fallback_id = salt;
1291 spin_unlock_bh(&ip_fb_id_lock);
1292}
1293
1294void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more)
1295{
1296 struct rtable *rt = (struct rtable *) dst;
1297
1298 if (rt) {
1299 if (rt->peer == NULL)
1300 rt_bind_peer(rt, 1);
1301
1302 /* If peer is attached to destination, it is never detached,
1303 so that we need not to grab a lock to dereference it.
1304 */
1305 if (rt->peer) {
1306 iph->id = htons(inet_getid(rt->peer, more));
1307 return;
1308 }
1309 } else
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001310 printk(KERN_DEBUG "rt_bind_peer(0) @%p\n",
Stephen Hemminger9c2b3322005-04-19 22:39:42 -07001311 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
1313 ip_select_fb_ident(iph);
1314}
1315
1316static void rt_del(unsigned hash, struct rtable *rt)
1317{
Eric Dumazet29e75252008-01-31 17:05:09 -08001318 struct rtable **rthp, *aux;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319
Eric Dumazet29e75252008-01-31 17:05:09 -08001320 rthp = &rt_hash_table[hash].chain;
Eric Dumazet22c047c2005-07-05 14:55:24 -07001321 spin_lock_bh(rt_hash_lock_addr(hash));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 ip_rt_put(rt);
Eric Dumazet29e75252008-01-31 17:05:09 -08001323 while ((aux = *rthp) != NULL) {
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001324 if (aux == rt || rt_is_expired(aux)) {
Eric Dumazet29e75252008-01-31 17:05:09 -08001325 *rthp = aux->u.dst.rt_next;
1326 rt_free(aux);
1327 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 }
Eric Dumazet29e75252008-01-31 17:05:09 -08001329 rthp = &aux->u.dst.rt_next;
1330 }
Eric Dumazet22c047c2005-07-05 14:55:24 -07001331 spin_unlock_bh(rt_hash_lock_addr(hash));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332}
1333
Al Virof7655222006-09-26 21:25:43 -07001334void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
1335 __be32 saddr, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336{
1337 int i, k;
1338 struct in_device *in_dev = in_dev_get(dev);
1339 struct rtable *rth, **rthp;
Al Virof7655222006-09-26 21:25:43 -07001340 __be32 skeys[2] = { saddr, 0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 int ikeys[2] = { dev->ifindex, 0 };
Tom Tucker8d717402006-07-30 20:43:36 -07001342 struct netevent_redirect netevent;
Denis V. Lunev317805b2008-02-28 20:50:06 -08001343 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 if (!in_dev)
1346 return;
1347
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001348 net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev)
Jan Engelhardt1e637c72008-01-21 03:18:08 -08001350 || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw)
Joe Perchesf97c1e02007-12-16 13:45:43 -08001351 || ipv4_is_zeronet(new_gw))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 goto reject_redirect;
1353
Neil Horman1080d702008-10-27 12:28:25 -07001354 if (!rt_caching(net))
1355 goto reject_redirect;
1356
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 if (!IN_DEV_SHARED_MEDIA(in_dev)) {
1358 if (!inet_addr_onlink(in_dev, new_gw, old_gw))
1359 goto reject_redirect;
1360 if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev))
1361 goto reject_redirect;
1362 } else {
Denis V. Lunev317805b2008-02-28 20:50:06 -08001363 if (inet_addr_type(net, new_gw) != RTN_UNICAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 goto reject_redirect;
1365 }
1366
1367 for (i = 0; i < 2; i++) {
1368 for (k = 0; k < 2; k++) {
Denis V. Lunevb00180d2008-07-05 19:04:09 -07001369 unsigned hash = rt_hash(daddr, skeys[i], ikeys[k],
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001370 rt_genid(net));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
1372 rthp=&rt_hash_table[hash].chain;
1373
1374 rcu_read_lock();
1375 while ((rth = rcu_dereference(*rthp)) != NULL) {
1376 struct rtable *rt;
1377
1378 if (rth->fl.fl4_dst != daddr ||
1379 rth->fl.fl4_src != skeys[i] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 rth->fl.oif != ikeys[k] ||
Eric Dumazet29e75252008-01-31 17:05:09 -08001381 rth->fl.iif != 0 ||
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001382 rt_is_expired(rth) ||
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09001383 !net_eq(dev_net(rth->u.dst.dev), net)) {
Eric Dumazet093c2ca2007-02-09 16:19:26 -08001384 rthp = &rth->u.dst.rt_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 continue;
1386 }
1387
1388 if (rth->rt_dst != daddr ||
1389 rth->rt_src != saddr ||
1390 rth->u.dst.error ||
1391 rth->rt_gateway != old_gw ||
1392 rth->u.dst.dev != dev)
1393 break;
1394
1395 dst_hold(&rth->u.dst);
1396 rcu_read_unlock();
1397
1398 rt = dst_alloc(&ipv4_dst_ops);
1399 if (rt == NULL) {
1400 ip_rt_put(rth);
1401 in_dev_put(in_dev);
1402 return;
1403 }
1404
1405 /* Copy all the information. */
1406 *rt = *rth;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 rt->u.dst.__use = 1;
1408 atomic_set(&rt->u.dst.__refcnt, 1);
1409 rt->u.dst.child = NULL;
1410 if (rt->u.dst.dev)
1411 dev_hold(rt->u.dst.dev);
1412 if (rt->idev)
1413 in_dev_hold(rt->idev);
1414 rt->u.dst.obsolete = 0;
1415 rt->u.dst.lastuse = jiffies;
1416 rt->u.dst.path = &rt->u.dst;
1417 rt->u.dst.neighbour = NULL;
1418 rt->u.dst.hh = NULL;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07001419#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 rt->u.dst.xfrm = NULL;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07001421#endif
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001422 rt->rt_genid = rt_genid(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 rt->rt_flags |= RTCF_REDIRECTED;
1424
1425 /* Gateway is different ... */
1426 rt->rt_gateway = new_gw;
1427
1428 /* Redirect received -> path was valid */
1429 dst_confirm(&rth->u.dst);
1430
1431 if (rt->peer)
1432 atomic_inc(&rt->peer->refcnt);
1433
1434 if (arp_bind_neighbour(&rt->u.dst) ||
1435 !(rt->u.dst.neighbour->nud_state &
1436 NUD_VALID)) {
1437 if (rt->u.dst.neighbour)
1438 neigh_event_send(rt->u.dst.neighbour, NULL);
1439 ip_rt_put(rth);
1440 rt_drop(rt);
1441 goto do_next;
1442 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001443
Tom Tucker8d717402006-07-30 20:43:36 -07001444 netevent.old = &rth->u.dst;
1445 netevent.new = &rt->u.dst;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001446 call_netevent_notifiers(NETEVENT_REDIRECT,
1447 &netevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
1449 rt_del(hash, rth);
Eric Dumazet511c3f92009-06-02 05:14:27 +00001450 if (!rt_intern_hash(hash, rt, &rt, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 ip_rt_put(rt);
1452 goto do_next;
1453 }
1454 rcu_read_unlock();
1455 do_next:
1456 ;
1457 }
1458 }
1459 in_dev_put(in_dev);
1460 return;
1461
1462reject_redirect:
1463#ifdef CONFIG_IP_ROUTE_VERBOSE
1464 if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
Harvey Harrison673d57e2008-10-31 00:53:57 -07001465 printk(KERN_INFO "Redirect from %pI4 on %s about %pI4 ignored.\n"
1466 " Advised path = %pI4 -> %pI4\n",
1467 &old_gw, dev->name, &new_gw,
1468 &saddr, &daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469#endif
1470 in_dev_put(in_dev);
1471}
1472
1473static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
1474{
Eric Dumazetee6b9672008-03-05 18:30:47 -08001475 struct rtable *rt = (struct rtable *)dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 struct dst_entry *ret = dst;
1477
1478 if (rt) {
1479 if (dst->obsolete) {
1480 ip_rt_put(rt);
1481 ret = NULL;
1482 } else if ((rt->rt_flags & RTCF_REDIRECTED) ||
1483 rt->u.dst.expires) {
Al Viro8c7bc842006-09-26 21:26:19 -07001484 unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src,
Denis V. Lunevb00180d2008-07-05 19:04:09 -07001485 rt->fl.oif,
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001486 rt_genid(dev_net(dst->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487#if RT_CACHE_DEBUG >= 1
Harvey Harrison673d57e2008-10-31 00:53:57 -07001488 printk(KERN_DEBUG "ipv4_negative_advice: redirect to %pI4/%02x dropped\n",
1489 &rt->rt_dst, rt->fl.fl4_tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490#endif
1491 rt_del(hash, rt);
1492 ret = NULL;
1493 }
1494 }
1495 return ret;
1496}
1497
1498/*
1499 * Algorithm:
1500 * 1. The first ip_rt_redirect_number redirects are sent
1501 * with exponential backoff, then we stop sending them at all,
1502 * assuming that the host ignores our redirects.
1503 * 2. If we did not see packets requiring redirects
1504 * during ip_rt_redirect_silence, we assume that the host
1505 * forgot redirected route and start to send redirects again.
1506 *
1507 * This algorithm is much cheaper and more intelligent than dumb load limiting
1508 * in icmp.c.
1509 *
1510 * NOTE. Do not forget to inhibit load limiting for redirects (redundant)
1511 * and "frag. need" (breaks PMTU discovery) in icmp.c.
1512 */
1513
1514void ip_rt_send_redirect(struct sk_buff *skb)
1515{
Eric Dumazet511c3f92009-06-02 05:14:27 +00001516 struct rtable *rt = skb_rtable(skb);
Eric Dumazet30038fc2009-08-28 23:52:01 -07001517 struct in_device *in_dev;
1518 int log_martians;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519
Eric Dumazet30038fc2009-08-28 23:52:01 -07001520 rcu_read_lock();
1521 in_dev = __in_dev_get_rcu(rt->u.dst.dev);
1522 if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) {
1523 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 return;
Eric Dumazet30038fc2009-08-28 23:52:01 -07001525 }
1526 log_martians = IN_DEV_LOG_MARTIANS(in_dev);
1527 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
1529 /* No redirected packets during ip_rt_redirect_silence;
1530 * reset the algorithm.
1531 */
1532 if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence))
1533 rt->u.dst.rate_tokens = 0;
1534
1535 /* Too many ignored redirects; do not send anything
1536 * set u.dst.rate_last to the last seen redirected packet.
1537 */
1538 if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) {
1539 rt->u.dst.rate_last = jiffies;
Eric Dumazet30038fc2009-08-28 23:52:01 -07001540 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 }
1542
1543 /* Check for load limit; set rate_last to the latest sent
1544 * redirect.
1545 */
Li Yewang14fb8a72006-12-18 00:26:35 -08001546 if (rt->u.dst.rate_tokens == 0 ||
1547 time_after(jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 (rt->u.dst.rate_last +
1549 (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) {
1550 icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway);
1551 rt->u.dst.rate_last = jiffies;
1552 ++rt->u.dst.rate_tokens;
1553#ifdef CONFIG_IP_ROUTE_VERBOSE
Eric Dumazet30038fc2009-08-28 23:52:01 -07001554 if (log_martians &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 rt->u.dst.rate_tokens == ip_rt_redirect_number &&
1556 net_ratelimit())
Harvey Harrison673d57e2008-10-31 00:53:57 -07001557 printk(KERN_WARNING "host %pI4/if%d ignores redirects for %pI4 to %pI4.\n",
1558 &rt->rt_src, rt->rt_iif,
1559 &rt->rt_dst, &rt->rt_gateway);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560#endif
1561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562}
1563
1564static int ip_error(struct sk_buff *skb)
1565{
Eric Dumazet511c3f92009-06-02 05:14:27 +00001566 struct rtable *rt = skb_rtable(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 unsigned long now;
1568 int code;
1569
1570 switch (rt->u.dst.error) {
1571 case EINVAL:
1572 default:
1573 goto out;
1574 case EHOSTUNREACH:
1575 code = ICMP_HOST_UNREACH;
1576 break;
1577 case ENETUNREACH:
1578 code = ICMP_NET_UNREACH;
Pavel Emelyanov7c73a6f2008-07-16 20:20:11 -07001579 IP_INC_STATS_BH(dev_net(rt->u.dst.dev),
1580 IPSTATS_MIB_INNOROUTES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 break;
1582 case EACCES:
1583 code = ICMP_PKT_FILTERED;
1584 break;
1585 }
1586
1587 now = jiffies;
1588 rt->u.dst.rate_tokens += now - rt->u.dst.rate_last;
1589 if (rt->u.dst.rate_tokens > ip_rt_error_burst)
1590 rt->u.dst.rate_tokens = ip_rt_error_burst;
1591 rt->u.dst.rate_last = now;
1592 if (rt->u.dst.rate_tokens >= ip_rt_error_cost) {
1593 rt->u.dst.rate_tokens -= ip_rt_error_cost;
1594 icmp_send(skb, ICMP_DEST_UNREACH, code, 0);
1595 }
1596
1597out: kfree_skb(skb);
1598 return 0;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001599}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600
1601/*
1602 * The last two values are not from the RFC but
1603 * are needed for AMPRnet AX.25 paths.
1604 */
1605
Arjan van de Ven9b5b5cf2005-11-29 16:21:38 -08001606static const unsigned short mtu_plateau[] =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607{32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 };
1608
Stephen Hemminger5969f712008-04-10 01:52:09 -07001609static inline unsigned short guess_mtu(unsigned short old_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610{
1611 int i;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001612
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++)
1614 if (old_mtu > mtu_plateau[i])
1615 return mtu_plateau[i];
1616 return 68;
1617}
1618
Denis V. Lunevb5921912008-01-22 23:50:25 -08001619unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
Timo Teras0010e462008-04-29 03:32:25 -07001620 unsigned short new_mtu,
1621 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622{
Timo Teras0010e462008-04-29 03:32:25 -07001623 int i, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 unsigned short old_mtu = ntohs(iph->tot_len);
1625 struct rtable *rth;
Timo Teras0010e462008-04-29 03:32:25 -07001626 int ikeys[2] = { dev->ifindex, 0 };
Al Viroe4485152006-09-26 22:15:01 -07001627 __be32 skeys[2] = { iph->saddr, 0, };
1628 __be32 daddr = iph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 unsigned short est_mtu = 0;
1630
1631 if (ipv4_config.no_pmtu_disc)
1632 return 0;
1633
Timo Teras0010e462008-04-29 03:32:25 -07001634 for (k = 0; k < 2; k++) {
1635 for (i = 0; i < 2; i++) {
Denis V. Lunevb00180d2008-07-05 19:04:09 -07001636 unsigned hash = rt_hash(daddr, skeys[i], ikeys[k],
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001637 rt_genid(net));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
Timo Teras0010e462008-04-29 03:32:25 -07001639 rcu_read_lock();
1640 for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
1641 rth = rcu_dereference(rth->u.dst.rt_next)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 unsigned short mtu = new_mtu;
1643
Timo Teras0010e462008-04-29 03:32:25 -07001644 if (rth->fl.fl4_dst != daddr ||
1645 rth->fl.fl4_src != skeys[i] ||
1646 rth->rt_dst != daddr ||
1647 rth->rt_src != iph->saddr ||
1648 rth->fl.oif != ikeys[k] ||
1649 rth->fl.iif != 0 ||
1650 dst_metric_locked(&rth->u.dst, RTAX_MTU) ||
1651 !net_eq(dev_net(rth->u.dst.dev), net) ||
Hugh Dickins6c3b8fc2008-07-26 17:51:06 -07001652 rt_is_expired(rth))
Timo Teras0010e462008-04-29 03:32:25 -07001653 continue;
1654
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 if (new_mtu < 68 || new_mtu >= old_mtu) {
1656
1657 /* BSD 4.2 compatibility hack :-( */
1658 if (mtu == 0 &&
Rami Rosen6d273f82008-08-06 02:33:49 -07001659 old_mtu >= dst_mtu(&rth->u.dst) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 old_mtu >= 68 + (iph->ihl << 2))
1661 old_mtu -= iph->ihl << 2;
1662
1663 mtu = guess_mtu(old_mtu);
1664 }
Rami Rosen6d273f82008-08-06 02:33:49 -07001665 if (mtu <= dst_mtu(&rth->u.dst)) {
1666 if (mtu < dst_mtu(&rth->u.dst)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 dst_confirm(&rth->u.dst);
1668 if (mtu < ip_rt_min_pmtu) {
1669 mtu = ip_rt_min_pmtu;
1670 rth->u.dst.metrics[RTAX_LOCK-1] |=
1671 (1 << RTAX_MTU);
1672 }
1673 rth->u.dst.metrics[RTAX_MTU-1] = mtu;
1674 dst_set_expires(&rth->u.dst,
1675 ip_rt_mtu_expires);
1676 }
1677 est_mtu = mtu;
1678 }
1679 }
Timo Teras0010e462008-04-29 03:32:25 -07001680 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 }
1683 return est_mtu ? : new_mtu;
1684}
1685
1686static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
1687{
Rami Rosen6d273f82008-08-06 02:33:49 -07001688 if (dst_mtu(dst) > mtu && mtu >= 68 &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 !(dst_metric_locked(dst, RTAX_MTU))) {
1690 if (mtu < ip_rt_min_pmtu) {
1691 mtu = ip_rt_min_pmtu;
1692 dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU);
1693 }
1694 dst->metrics[RTAX_MTU-1] = mtu;
1695 dst_set_expires(dst, ip_rt_mtu_expires);
Tom Tucker8d717402006-07-30 20:43:36 -07001696 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 }
1698}
1699
1700static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
1701{
1702 return NULL;
1703}
1704
1705static void ipv4_dst_destroy(struct dst_entry *dst)
1706{
1707 struct rtable *rt = (struct rtable *) dst;
1708 struct inet_peer *peer = rt->peer;
1709 struct in_device *idev = rt->idev;
1710
1711 if (peer) {
1712 rt->peer = NULL;
1713 inet_putpeer(peer);
1714 }
1715
1716 if (idev) {
1717 rt->idev = NULL;
1718 in_dev_put(idev);
1719 }
1720}
1721
1722static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
1723 int how)
1724{
1725 struct rtable *rt = (struct rtable *) dst;
1726 struct in_device *idev = rt->idev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001727 if (dev != dev_net(dev)->loopback_dev && idev && idev->dev == dev) {
Denis V. Lunev5a3e55d2007-12-07 00:38:10 -08001728 struct in_device *loopback_idev =
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001729 in_dev_get(dev_net(dev)->loopback_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 if (loopback_idev) {
1731 rt->idev = loopback_idev;
1732 in_dev_put(idev);
1733 }
1734 }
1735}
1736
1737static void ipv4_link_failure(struct sk_buff *skb)
1738{
1739 struct rtable *rt;
1740
1741 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
1742
Eric Dumazet511c3f92009-06-02 05:14:27 +00001743 rt = skb_rtable(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 if (rt)
1745 dst_set_expires(&rt->u.dst, 0);
1746}
1747
1748static int ip_rt_bug(struct sk_buff *skb)
1749{
Harvey Harrison673d57e2008-10-31 00:53:57 -07001750 printk(KERN_DEBUG "ip_rt_bug: %pI4 -> %pI4, %s\n",
1751 &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 skb->dev ? skb->dev->name : "?");
1753 kfree_skb(skb);
1754 return 0;
1755}
1756
1757/*
1758 We do not cache source address of outgoing interface,
1759 because it is used only by IP RR, TS and SRR options,
1760 so that it out of fast path.
1761
1762 BTW remember: "addr" is allowed to be not aligned
1763 in IP options!
1764 */
1765
1766void ip_rt_get_source(u8 *addr, struct rtable *rt)
1767{
Al Viroa61ced52006-09-26 21:27:54 -07001768 __be32 src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 struct fib_result res;
1770
1771 if (rt->fl.iif == 0)
1772 src = rt->rt_src;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001773 else if (fib_lookup(dev_net(rt->u.dst.dev), &rt->fl, &res) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 src = FIB_RES_PREFSRC(res);
1775 fib_res_put(&res);
1776 } else
1777 src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway,
1778 RT_SCOPE_UNIVERSE);
1779 memcpy(addr, &src, 4);
1780}
1781
1782#ifdef CONFIG_NET_CLS_ROUTE
1783static void set_class_tag(struct rtable *rt, u32 tag)
1784{
1785 if (!(rt->u.dst.tclassid & 0xFFFF))
1786 rt->u.dst.tclassid |= tag & 0xFFFF;
1787 if (!(rt->u.dst.tclassid & 0xFFFF0000))
1788 rt->u.dst.tclassid |= tag & 0xFFFF0000;
1789}
1790#endif
1791
1792static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag)
1793{
1794 struct fib_info *fi = res->fi;
1795
1796 if (fi) {
1797 if (FIB_RES_GW(*res) &&
1798 FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
1799 rt->rt_gateway = FIB_RES_GW(*res);
1800 memcpy(rt->u.dst.metrics, fi->fib_metrics,
1801 sizeof(rt->u.dst.metrics));
1802 if (fi->fib_mtu == 0) {
1803 rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
Satoru SATOH0bbeafd2008-05-04 22:12:43 -07001804 if (dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 rt->rt_gateway != rt->rt_dst &&
1806 rt->u.dst.dev->mtu > 576)
1807 rt->u.dst.metrics[RTAX_MTU-1] = 576;
1808 }
1809#ifdef CONFIG_NET_CLS_ROUTE
1810 rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid;
1811#endif
1812 } else
1813 rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu;
1814
Satoru SATOH5ffc02a2008-05-04 22:14:42 -07001815 if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl;
Rami Rosen6d273f82008-08-06 02:33:49 -07001817 if (dst_mtu(&rt->u.dst) > IP_MAX_MTU)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU;
Satoru SATOH5ffc02a2008-05-04 22:14:42 -07001819 if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40,
1821 ip_rt_min_advmss);
Satoru SATOH5ffc02a2008-05-04 22:14:42 -07001822 if (dst_metric(&rt->u.dst, RTAX_ADVMSS) > 65535 - 40)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40;
1824
1825#ifdef CONFIG_NET_CLS_ROUTE
1826#ifdef CONFIG_IP_MULTIPLE_TABLES
1827 set_class_tag(rt, fib_rules_tclass(res));
1828#endif
1829 set_class_tag(rt, itag);
1830#endif
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001831 rt->rt_type = res->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832}
1833
Al Viro9e12bb22006-09-26 21:25:20 -07001834static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 u8 tos, struct net_device *dev, int our)
1836{
1837 unsigned hash;
1838 struct rtable *rth;
Al Viroa61ced52006-09-26 21:27:54 -07001839 __be32 spec_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 struct in_device *in_dev = in_dev_get(dev);
1841 u32 itag = 0;
1842
1843 /* Primary sanity checks. */
1844
1845 if (in_dev == NULL)
1846 return -EINVAL;
1847
Jan Engelhardt1e637c72008-01-21 03:18:08 -08001848 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
Joe Perchesf97c1e02007-12-16 13:45:43 -08001849 ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 goto e_inval;
1851
Joe Perchesf97c1e02007-12-16 13:45:43 -08001852 if (ipv4_is_zeronet(saddr)) {
1853 if (!ipv4_is_local_multicast(daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 goto e_inval;
1855 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
1856 } else if (fib_validate_source(saddr, 0, tos, 0,
jamalb0c110c2009-10-18 02:12:33 +00001857 dev, &spec_dst, &itag, 0) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 goto e_inval;
1859
1860 rth = dst_alloc(&ipv4_dst_ops);
1861 if (!rth)
1862 goto e_nobufs;
1863
1864 rth->u.dst.output= ip_rt_bug;
1865
1866 atomic_set(&rth->u.dst.__refcnt, 1);
1867 rth->u.dst.flags= DST_HOST;
Herbert Xu42f811b2007-06-04 23:34:44 -07001868 if (IN_DEV_CONF_GET(in_dev, NOPOLICY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 rth->u.dst.flags |= DST_NOPOLICY;
1870 rth->fl.fl4_dst = daddr;
1871 rth->rt_dst = daddr;
1872 rth->fl.fl4_tos = tos;
Thomas Graf47dcf0c2006-11-09 15:20:38 -08001873 rth->fl.mark = skb->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 rth->fl.fl4_src = saddr;
1875 rth->rt_src = saddr;
1876#ifdef CONFIG_NET_CLS_ROUTE
1877 rth->u.dst.tclassid = itag;
1878#endif
1879 rth->rt_iif =
1880 rth->fl.iif = dev->ifindex;
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001881 rth->u.dst.dev = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 dev_hold(rth->u.dst.dev);
1883 rth->idev = in_dev_get(rth->u.dst.dev);
1884 rth->fl.oif = 0;
1885 rth->rt_gateway = daddr;
1886 rth->rt_spec_dst= spec_dst;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001887 rth->rt_genid = rt_genid(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 rth->rt_flags = RTCF_MULTICAST;
Eric Dumazet29e75252008-01-31 17:05:09 -08001889 rth->rt_type = RTN_MULTICAST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 if (our) {
1891 rth->u.dst.input= ip_local_deliver;
1892 rth->rt_flags |= RTCF_LOCAL;
1893 }
1894
1895#ifdef CONFIG_IP_MROUTE
Joe Perchesf97c1e02007-12-16 13:45:43 -08001896 if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 rth->u.dst.input = ip_mr_input;
1898#endif
1899 RT_CACHE_STAT_INC(in_slow_mc);
1900
1901 in_dev_put(in_dev);
Denis V. Luneve84f84f2008-07-05 19:04:32 -07001902 hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev)));
Eric Dumazet511c3f92009-06-02 05:14:27 +00001903 return rt_intern_hash(hash, rth, NULL, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904
1905e_nobufs:
1906 in_dev_put(in_dev);
1907 return -ENOBUFS;
1908
1909e_inval:
1910 in_dev_put(in_dev);
1911 return -EINVAL;
1912}
1913
1914
1915static void ip_handle_martian_source(struct net_device *dev,
1916 struct in_device *in_dev,
1917 struct sk_buff *skb,
Al Viro9e12bb22006-09-26 21:25:20 -07001918 __be32 daddr,
1919 __be32 saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920{
1921 RT_CACHE_STAT_INC(in_martian_src);
1922#ifdef CONFIG_IP_ROUTE_VERBOSE
1923 if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) {
1924 /*
1925 * RFC1812 recommendation, if source is martian,
1926 * the only hint is MAC header.
1927 */
Harvey Harrison673d57e2008-10-31 00:53:57 -07001928 printk(KERN_WARNING "martian source %pI4 from %pI4, on dev %s\n",
1929 &daddr, &saddr, dev->name);
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001930 if (dev->hard_header_len && skb_mac_header_was_set(skb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 int i;
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001932 const unsigned char *p = skb_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 printk(KERN_WARNING "ll header: ");
1934 for (i = 0; i < dev->hard_header_len; i++, p++) {
1935 printk("%02x", *p);
1936 if (i < (dev->hard_header_len - 1))
1937 printk(":");
1938 }
1939 printk("\n");
1940 }
1941 }
1942#endif
1943}
1944
Stephen Hemminger5969f712008-04-10 01:52:09 -07001945static int __mkroute_input(struct sk_buff *skb,
1946 struct fib_result *res,
1947 struct in_device *in_dev,
1948 __be32 daddr, __be32 saddr, u32 tos,
1949 struct rtable **result)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950{
1951
1952 struct rtable *rth;
1953 int err;
1954 struct in_device *out_dev;
1955 unsigned flags = 0;
Al Virod9c9df82006-09-26 21:28:14 -07001956 __be32 spec_dst;
1957 u32 itag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958
1959 /* get a working reference to the output device */
1960 out_dev = in_dev_get(FIB_RES_DEV(*res));
1961 if (out_dev == NULL) {
1962 if (net_ratelimit())
1963 printk(KERN_CRIT "Bug in ip_route_input" \
1964 "_slow(). Please, report\n");
1965 return -EINVAL;
1966 }
1967
1968
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001969 err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res),
jamalb0c110c2009-10-18 02:12:33 +00001970 in_dev->dev, &spec_dst, &itag, skb->mark);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 if (err < 0) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001972 ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973 saddr);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001974
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 err = -EINVAL;
1976 goto cleanup;
1977 }
1978
1979 if (err)
1980 flags |= RTCF_DIRECTSRC;
1981
Thomas Graf51b77ca2008-06-03 16:36:01 -07001982 if (out_dev == in_dev && err &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 (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.
1990 */
Rami Rosencb7928a2008-01-09 00:18:24 -08001991 if (out_dev == in_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 err = -EINVAL;
1993 goto cleanup;
1994 }
1995 }
1996
1997
1998 rth = dst_alloc(&ipv4_dst_ops);
1999 if (!rth) {
2000 err = -ENOBUFS;
2001 goto cleanup;
2002 }
2003
Julian Anastasovce723d82005-09-08 13:34:47 -07002004 atomic_set(&rth->u.dst.__refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 rth->u.dst.flags= DST_HOST;
Herbert Xu42f811b2007-06-04 23:34:44 -07002006 if (IN_DEV_CONF_GET(in_dev, NOPOLICY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 rth->u.dst.flags |= DST_NOPOLICY;
Herbert Xu42f811b2007-06-04 23:34:44 -07002008 if (IN_DEV_CONF_GET(out_dev, NOXFRM))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 rth->u.dst.flags |= DST_NOXFRM;
2010 rth->fl.fl4_dst = daddr;
2011 rth->rt_dst = daddr;
2012 rth->fl.fl4_tos = tos;
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002013 rth->fl.mark = skb->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 rth->fl.fl4_src = saddr;
2015 rth->rt_src = saddr;
2016 rth->rt_gateway = daddr;
2017 rth->rt_iif =
2018 rth->fl.iif = in_dev->dev->ifindex;
2019 rth->u.dst.dev = (out_dev)->dev;
2020 dev_hold(rth->u.dst.dev);
2021 rth->idev = in_dev_get(rth->u.dst.dev);
2022 rth->fl.oif = 0;
2023 rth->rt_spec_dst= spec_dst;
2024
2025 rth->u.dst.input = ip_forward;
2026 rth->u.dst.output = ip_output;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002027 rth->rt_genid = rt_genid(dev_net(rth->u.dst.dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
2029 rt_set_nexthop(rth, res, itag);
2030
2031 rth->rt_flags = flags;
2032
2033 *result = rth;
2034 err = 0;
2035 cleanup:
2036 /* release the working reference to the output device */
2037 in_dev_put(out_dev);
2038 return err;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002039}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040
Stephen Hemminger5969f712008-04-10 01:52:09 -07002041static int ip_mkroute_input(struct sk_buff *skb,
2042 struct fib_result *res,
2043 const struct flowi *fl,
2044 struct in_device *in_dev,
2045 __be32 daddr, __be32 saddr, u32 tos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046{
Chuck Short7abaa272005-06-22 22:10:23 -07002047 struct rtable* rth = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 int err;
2049 unsigned hash;
2050
2051#ifdef CONFIG_IP_ROUTE_MULTIPATH
2052 if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0)
2053 fib_select_multipath(fl, res);
2054#endif
2055
2056 /* create a routing cache entry */
2057 err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth);
2058 if (err)
2059 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
2061 /* put it into the cache */
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002062 hash = rt_hash(daddr, saddr, fl->iif,
2063 rt_genid(dev_net(rth->u.dst.dev)));
Eric Dumazet511c3f92009-06-02 05:14:27 +00002064 return rt_intern_hash(hash, rth, NULL, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065}
2066
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067/*
2068 * NOTE. We drop all the packets that has local source
2069 * addresses, because every properly looped back packet
2070 * must have correct destination already attached by output routine.
2071 *
2072 * Such approach solves two big problems:
2073 * 1. Not simplex devices are handled properly.
2074 * 2. IP spoofing attempts are filtered with 100% of guarantee.
2075 */
2076
Al Viro9e12bb22006-09-26 21:25:20 -07002077static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 u8 tos, struct net_device *dev)
2079{
2080 struct fib_result res;
2081 struct in_device *in_dev = in_dev_get(dev);
2082 struct flowi fl = { .nl_u = { .ip4_u =
2083 { .daddr = daddr,
2084 .saddr = saddr,
2085 .tos = tos,
2086 .scope = RT_SCOPE_UNIVERSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087 } },
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002088 .mark = skb->mark,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 .iif = dev->ifindex };
2090 unsigned flags = 0;
2091 u32 itag = 0;
2092 struct rtable * rth;
2093 unsigned hash;
Al Viro9e12bb22006-09-26 21:25:20 -07002094 __be32 spec_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 int err = -EINVAL;
2096 int free_res = 0;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002097 struct net * net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098
2099 /* IP on this device is disabled. */
2100
2101 if (!in_dev)
2102 goto out;
2103
2104 /* Check for the most weird martians, which can be not detected
2105 by fib_lookup.
2106 */
2107
Jan Engelhardt1e637c72008-01-21 03:18:08 -08002108 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
Joe Perchesf97c1e02007-12-16 13:45:43 -08002109 ipv4_is_loopback(saddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 goto martian_source;
2111
Al Viroe4485152006-09-26 22:15:01 -07002112 if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 goto brd_input;
2114
2115 /* Accept zero addresses only to limited broadcast;
2116 * I even do not know to fix it or not. Waiting for complains :-)
2117 */
Joe Perchesf97c1e02007-12-16 13:45:43 -08002118 if (ipv4_is_zeronet(saddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 goto martian_source;
2120
Jan Engelhardt1e637c72008-01-21 03:18:08 -08002121 if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) ||
Joe Perchesf97c1e02007-12-16 13:45:43 -08002122 ipv4_is_loopback(daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123 goto martian_destination;
2124
2125 /*
2126 * Now we are ready to route packet.
2127 */
Denis V. Lunev84a885f2008-01-21 17:34:35 -08002128 if ((err = fib_lookup(net, &fl, &res)) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 if (!IN_DEV_FORWARD(in_dev))
Dietmar Eggemann2c2910a2005-06-28 13:06:23 -07002130 goto e_hostunreach;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 goto no_route;
2132 }
2133 free_res = 1;
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) {
2141 int result;
2142 result = fib_validate_source(saddr, daddr, tos,
Denis V. Lunev84a885f2008-01-21 17:34:35 -08002143 net->loopback_dev->ifindex,
jamalb0c110c2009-10-18 02:12:33 +00002144 dev, &spec_dst, &itag, skb->mark);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 if (result < 0)
2146 goto martian_source;
2147 if (result)
2148 flags |= RTCF_DIRECTSRC;
2149 spec_dst = daddr;
2150 goto local_input;
2151 }
2152
2153 if (!IN_DEV_FORWARD(in_dev))
Dietmar Eggemann2c2910a2005-06-28 13:06:23 -07002154 goto e_hostunreach;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 if (res.type != RTN_UNICAST)
2156 goto martian_destination;
2157
2158 err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159done:
2160 in_dev_put(in_dev);
2161 if (free_res)
2162 fib_res_put(&res);
2163out: return err;
2164
2165brd_input:
2166 if (skb->protocol != htons(ETH_P_IP))
2167 goto e_inval;
2168
Joe Perchesf97c1e02007-12-16 13:45:43 -08002169 if (ipv4_is_zeronet(saddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK);
2171 else {
2172 err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst,
jamalb0c110c2009-10-18 02:12:33 +00002173 &itag, skb->mark);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174 if (err < 0)
2175 goto martian_source;
2176 if (err)
2177 flags |= RTCF_DIRECTSRC;
2178 }
2179 flags |= RTCF_BROADCAST;
2180 res.type = RTN_BROADCAST;
2181 RT_CACHE_STAT_INC(in_brd);
2182
2183local_input:
2184 rth = dst_alloc(&ipv4_dst_ops);
2185 if (!rth)
2186 goto e_nobufs;
2187
2188 rth->u.dst.output= ip_rt_bug;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002189 rth->rt_genid = rt_genid(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190
2191 atomic_set(&rth->u.dst.__refcnt, 1);
2192 rth->u.dst.flags= DST_HOST;
Herbert Xu42f811b2007-06-04 23:34:44 -07002193 if (IN_DEV_CONF_GET(in_dev, NOPOLICY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 rth->u.dst.flags |= DST_NOPOLICY;
2195 rth->fl.fl4_dst = daddr;
2196 rth->rt_dst = daddr;
2197 rth->fl.fl4_tos = tos;
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002198 rth->fl.mark = skb->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 rth->fl.fl4_src = saddr;
2200 rth->rt_src = saddr;
2201#ifdef CONFIG_NET_CLS_ROUTE
2202 rth->u.dst.tclassid = itag;
2203#endif
2204 rth->rt_iif =
2205 rth->fl.iif = dev->ifindex;
Denis V. Lunev84a885f2008-01-21 17:34:35 -08002206 rth->u.dst.dev = net->loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207 dev_hold(rth->u.dst.dev);
2208 rth->idev = in_dev_get(rth->u.dst.dev);
2209 rth->rt_gateway = daddr;
2210 rth->rt_spec_dst= spec_dst;
2211 rth->u.dst.input= ip_local_deliver;
2212 rth->rt_flags = flags|RTCF_LOCAL;
2213 if (res.type == RTN_UNREACHABLE) {
2214 rth->u.dst.input= ip_error;
2215 rth->u.dst.error= -err;
2216 rth->rt_flags &= ~RTCF_LOCAL;
2217 }
2218 rth->rt_type = res.type;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002219 hash = rt_hash(daddr, saddr, fl.iif, rt_genid(net));
Eric Dumazet511c3f92009-06-02 05:14:27 +00002220 err = rt_intern_hash(hash, rth, NULL, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 goto done;
2222
2223no_route:
2224 RT_CACHE_STAT_INC(in_no_route);
2225 spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
2226 res.type = RTN_UNREACHABLE;
Mitsuru Chinen7f538782007-12-07 01:07:24 -08002227 if (err == -ESRCH)
2228 err = -ENETUNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 goto local_input;
2230
2231 /*
2232 * Do not cache martian addresses: they should be logged (RFC1812)
2233 */
2234martian_destination:
2235 RT_CACHE_STAT_INC(in_martian_dst);
2236#ifdef CONFIG_IP_ROUTE_VERBOSE
2237 if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
Harvey Harrison673d57e2008-10-31 00:53:57 -07002238 printk(KERN_WARNING "martian destination %pI4 from %pI4, dev %s\n",
2239 &daddr, &saddr, dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240#endif
Dietmar Eggemann2c2910a2005-06-28 13:06:23 -07002241
2242e_hostunreach:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002243 err = -EHOSTUNREACH;
2244 goto done;
Dietmar Eggemann2c2910a2005-06-28 13:06:23 -07002245
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246e_inval:
2247 err = -EINVAL;
2248 goto done;
2249
2250e_nobufs:
2251 err = -ENOBUFS;
2252 goto done;
2253
2254martian_source:
2255 ip_handle_martian_source(dev, in_dev, skb, daddr, saddr);
2256 goto e_inval;
2257}
2258
Al Viro9e12bb22006-09-26 21:25:20 -07002259int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 u8 tos, struct net_device *dev)
2261{
2262 struct rtable * rth;
2263 unsigned hash;
2264 int iif = dev->ifindex;
Denis V. Lunevb5921912008-01-22 23:50:25 -08002265 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002267 net = dev_net(dev);
Neil Horman1080d702008-10-27 12:28:25 -07002268
2269 if (!rt_caching(net))
2270 goto skip_cache;
2271
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272 tos &= IPTOS_RT_MASK;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002273 hash = rt_hash(daddr, saddr, iif, rt_genid(net));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274
2275 rcu_read_lock();
2276 for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
Eric Dumazet093c2ca2007-02-09 16:19:26 -08002277 rth = rcu_dereference(rth->u.dst.rt_next)) {
Stephen Hemmingerc0b8c322008-04-10 04:00:28 -07002278 if (((rth->fl.fl4_dst ^ daddr) |
2279 (rth->fl.fl4_src ^ saddr) |
2280 (rth->fl.iif ^ iif) |
2281 rth->fl.oif |
2282 (rth->fl.fl4_tos ^ tos)) == 0 &&
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002283 rth->fl.mark == skb->mark &&
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09002284 net_eq(dev_net(rth->u.dst.dev), net) &&
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002285 !rt_is_expired(rth)) {
Pavel Emelyanov03f49f32007-11-10 21:28:34 -08002286 dst_use(&rth->u.dst, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 RT_CACHE_STAT_INC(in_hit);
2288 rcu_read_unlock();
Eric Dumazetadf30902009-06-02 05:19:30 +00002289 skb_dst_set(skb, &rth->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 return 0;
2291 }
2292 RT_CACHE_STAT_INC(in_hlist_search);
2293 }
2294 rcu_read_unlock();
2295
Neil Horman1080d702008-10-27 12:28:25 -07002296skip_cache:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 /* Multicast recognition logic is moved from route cache to here.
2298 The problem was that too many Ethernet cards have broken/missing
2299 hardware multicast filters :-( As result the host on multicasting
2300 network acquires a lot of useless route cache entries, sort of
2301 SDR messages from all the world. Now we try to get rid of them.
2302 Really, provided software IP multicast filter is organized
2303 reasonably (at least, hashed), it does not result in a slowdown
2304 comparing with route cache reject entries.
2305 Note, that multicast routers are not affected, because
2306 route cache entry is created eventually.
2307 */
Joe Perchesf97c1e02007-12-16 13:45:43 -08002308 if (ipv4_is_multicast(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 struct in_device *in_dev;
2310
2311 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -07002312 if ((in_dev = __in_dev_get_rcu(dev)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 int our = ip_check_mc(in_dev, daddr, saddr,
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07002314 ip_hdr(skb)->protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 if (our
2316#ifdef CONFIG_IP_MROUTE
Joe Perchesf97c1e02007-12-16 13:45:43 -08002317 || (!ipv4_is_local_multicast(daddr) &&
2318 IN_DEV_MFORWARD(in_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319#endif
2320 ) {
2321 rcu_read_unlock();
2322 return ip_route_input_mc(skb, daddr, saddr,
2323 tos, dev, our);
2324 }
2325 }
2326 rcu_read_unlock();
2327 return -EINVAL;
2328 }
2329 return ip_route_input_slow(skb, daddr, saddr, tos, dev);
2330}
2331
Stephen Hemminger5969f712008-04-10 01:52:09 -07002332static int __mkroute_output(struct rtable **result,
2333 struct fib_result *res,
2334 const struct flowi *fl,
2335 const struct flowi *oldflp,
2336 struct net_device *dev_out,
2337 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338{
2339 struct rtable *rth;
2340 struct in_device *in_dev;
2341 u32 tos = RT_FL_TOS(oldflp);
2342 int err = 0;
2343
Joe Perchesf97c1e02007-12-16 13:45:43 -08002344 if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 return -EINVAL;
2346
Al Viroe4485152006-09-26 22:15:01 -07002347 if (fl->fl4_dst == htonl(0xFFFFFFFF))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 res->type = RTN_BROADCAST;
Joe Perchesf97c1e02007-12-16 13:45:43 -08002349 else if (ipv4_is_multicast(fl->fl4_dst))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350 res->type = RTN_MULTICAST;
Jan Engelhardt1e637c72008-01-21 03:18:08 -08002351 else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 return -EINVAL;
2353
2354 if (dev_out->flags & IFF_LOOPBACK)
2355 flags |= RTCF_LOCAL;
2356
2357 /* get work reference to inet device */
2358 in_dev = in_dev_get(dev_out);
2359 if (!in_dev)
2360 return -EINVAL;
2361
2362 if (res->type == RTN_BROADCAST) {
2363 flags |= RTCF_BROADCAST | RTCF_LOCAL;
2364 if (res->fi) {
2365 fib_info_put(res->fi);
2366 res->fi = NULL;
2367 }
2368 } else if (res->type == RTN_MULTICAST) {
2369 flags |= RTCF_MULTICAST|RTCF_LOCAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002370 if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 oldflp->proto))
2372 flags &= ~RTCF_LOCAL;
2373 /* If multicast route do not exist use
2374 default one, but do not gateway in this case.
2375 Yes, it is hack.
2376 */
2377 if (res->fi && res->prefixlen < 4) {
2378 fib_info_put(res->fi);
2379 res->fi = NULL;
2380 }
2381 }
2382
2383
2384 rth = dst_alloc(&ipv4_dst_ops);
2385 if (!rth) {
2386 err = -ENOBUFS;
2387 goto cleanup;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002388 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389
Julian Anastasovce723d82005-09-08 13:34:47 -07002390 atomic_set(&rth->u.dst.__refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391 rth->u.dst.flags= DST_HOST;
Herbert Xu42f811b2007-06-04 23:34:44 -07002392 if (IN_DEV_CONF_GET(in_dev, NOXFRM))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393 rth->u.dst.flags |= DST_NOXFRM;
Herbert Xu42f811b2007-06-04 23:34:44 -07002394 if (IN_DEV_CONF_GET(in_dev, NOPOLICY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395 rth->u.dst.flags |= DST_NOPOLICY;
2396
2397 rth->fl.fl4_dst = oldflp->fl4_dst;
2398 rth->fl.fl4_tos = tos;
2399 rth->fl.fl4_src = oldflp->fl4_src;
2400 rth->fl.oif = oldflp->oif;
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002401 rth->fl.mark = oldflp->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402 rth->rt_dst = fl->fl4_dst;
2403 rth->rt_src = fl->fl4_src;
2404 rth->rt_iif = oldflp->oif ? : dev_out->ifindex;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002405 /* get references to the devices that are to be hold by the routing
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 cache entry */
2407 rth->u.dst.dev = dev_out;
2408 dev_hold(dev_out);
2409 rth->idev = in_dev_get(dev_out);
2410 rth->rt_gateway = fl->fl4_dst;
2411 rth->rt_spec_dst= fl->fl4_src;
2412
2413 rth->u.dst.output=ip_output;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002414 rth->rt_genid = rt_genid(dev_net(dev_out));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415
2416 RT_CACHE_STAT_INC(out_slow_tot);
2417
2418 if (flags & RTCF_LOCAL) {
2419 rth->u.dst.input = ip_local_deliver;
2420 rth->rt_spec_dst = fl->fl4_dst;
2421 }
2422 if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) {
2423 rth->rt_spec_dst = fl->fl4_src;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002424 if (flags & RTCF_LOCAL &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002425 !(dev_out->flags & IFF_LOOPBACK)) {
2426 rth->u.dst.output = ip_mc_output;
2427 RT_CACHE_STAT_INC(out_slow_mc);
2428 }
2429#ifdef CONFIG_IP_MROUTE
2430 if (res->type == RTN_MULTICAST) {
2431 if (IN_DEV_MFORWARD(in_dev) &&
Joe Perchesf97c1e02007-12-16 13:45:43 -08002432 !ipv4_is_local_multicast(oldflp->fl4_dst)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 rth->u.dst.input = ip_mr_input;
2434 rth->u.dst.output = ip_mc_output;
2435 }
2436 }
2437#endif
2438 }
2439
2440 rt_set_nexthop(rth, res, 0);
2441
2442 rth->rt_flags = flags;
2443
2444 *result = rth;
2445 cleanup:
2446 /* release work reference to inet device */
2447 in_dev_put(in_dev);
2448
2449 return err;
2450}
2451
Stephen Hemminger5969f712008-04-10 01:52:09 -07002452static int ip_mkroute_output(struct rtable **rp,
2453 struct fib_result *res,
2454 const struct flowi *fl,
2455 const struct flowi *oldflp,
2456 struct net_device *dev_out,
2457 unsigned flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458{
Chuck Short7abaa272005-06-22 22:10:23 -07002459 struct rtable *rth = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460 int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags);
2461 unsigned hash;
2462 if (err == 0) {
Denis V. Lunevb00180d2008-07-05 19:04:09 -07002463 hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif,
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002464 rt_genid(dev_net(dev_out)));
Eric Dumazet511c3f92009-06-02 05:14:27 +00002465 err = rt_intern_hash(hash, rth, rp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002467
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468 return err;
2469}
2470
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471/*
2472 * Major route resolver routine.
2473 */
2474
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002475static int ip_route_output_slow(struct net *net, struct rtable **rp,
2476 const struct flowi *oldflp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477{
2478 u32 tos = RT_FL_TOS(oldflp);
2479 struct flowi fl = { .nl_u = { .ip4_u =
2480 { .daddr = oldflp->fl4_dst,
2481 .saddr = oldflp->fl4_src,
2482 .tos = tos & IPTOS_RT_MASK,
2483 .scope = ((tos & RTO_ONLINK) ?
2484 RT_SCOPE_LINK :
2485 RT_SCOPE_UNIVERSE),
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 } },
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002487 .mark = oldflp->mark,
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002488 .iif = net->loopback_dev->ifindex,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 .oif = oldflp->oif };
2490 struct fib_result res;
2491 unsigned flags = 0;
2492 struct net_device *dev_out = NULL;
2493 int free_res = 0;
2494 int err;
2495
2496
2497 res.fi = NULL;
2498#ifdef CONFIG_IP_MULTIPLE_TABLES
2499 res.r = NULL;
2500#endif
2501
2502 if (oldflp->fl4_src) {
2503 err = -EINVAL;
Joe Perchesf97c1e02007-12-16 13:45:43 -08002504 if (ipv4_is_multicast(oldflp->fl4_src) ||
Jan Engelhardt1e637c72008-01-21 03:18:08 -08002505 ipv4_is_lbcast(oldflp->fl4_src) ||
Joe Perchesf97c1e02007-12-16 13:45:43 -08002506 ipv4_is_zeronet(oldflp->fl4_src))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002507 goto out;
2508
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509 /* I removed check for oif == dev_out->oif here.
2510 It was wrong for two reasons:
Denis V. Lunev1ab35272008-01-22 22:04:30 -08002511 1. ip_dev_find(net, saddr) can return wrong iface, if saddr
2512 is assigned to multiple interfaces.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513 2. Moreover, we are allowed to send packets with saddr
2514 of another iface. --ANK
2515 */
2516
David S. Millerf6c5d732007-05-18 02:07:50 -07002517 if (oldflp->oif == 0
Joe Perchesf97c1e02007-12-16 13:45:43 -08002518 && (ipv4_is_multicast(oldflp->fl4_dst) ||
2519 oldflp->fl4_dst == htonl(0xFFFFFFFF))) {
Julian Anastasova210d012008-10-01 07:28:28 -07002520 /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
2521 dev_out = ip_dev_find(net, oldflp->fl4_src);
2522 if (dev_out == NULL)
2523 goto out;
2524
Linus Torvalds1da177e2005-04-16 15:20:36 -07002525 /* Special hack: user can direct multicasts
2526 and limited broadcast via necessary interface
2527 without fiddling with IP_MULTICAST_IF or IP_PKTINFO.
2528 This hack is not just for fun, it allows
2529 vic,vat and friends to work.
2530 They bind socket to loopback, set ttl to zero
2531 and expect that it will work.
2532 From the viewpoint of routing cache they are broken,
2533 because we are not allowed to build multicast path
2534 with loopback source addr (look, routing cache
2535 cannot know, that ttl is zero, so that packet
2536 will not leave this host and route is valid).
2537 Luckily, this hack is good workaround.
2538 */
2539
2540 fl.oif = dev_out->ifindex;
2541 goto make_route;
2542 }
Julian Anastasova210d012008-10-01 07:28:28 -07002543
2544 if (!(oldflp->flags & FLOWI_FLAG_ANYSRC)) {
2545 /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */
2546 dev_out = ip_dev_find(net, oldflp->fl4_src);
2547 if (dev_out == NULL)
2548 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549 dev_put(dev_out);
Julian Anastasova210d012008-10-01 07:28:28 -07002550 dev_out = NULL;
2551 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552 }
2553
2554
2555 if (oldflp->oif) {
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002556 dev_out = dev_get_by_index(net, oldflp->oif);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557 err = -ENODEV;
2558 if (dev_out == NULL)
2559 goto out;
Herbert Xue5ed6392005-10-03 14:35:55 -07002560
2561 /* RACE: Check return value of inet_select_addr instead. */
2562 if (__in_dev_get_rtnl(dev_out) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 dev_put(dev_out);
2564 goto out; /* Wrong error code */
2565 }
2566
Joe Perchesf97c1e02007-12-16 13:45:43 -08002567 if (ipv4_is_local_multicast(oldflp->fl4_dst) ||
2568 oldflp->fl4_dst == htonl(0xFFFFFFFF)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 if (!fl.fl4_src)
2570 fl.fl4_src = inet_select_addr(dev_out, 0,
2571 RT_SCOPE_LINK);
2572 goto make_route;
2573 }
2574 if (!fl.fl4_src) {
Joe Perchesf97c1e02007-12-16 13:45:43 -08002575 if (ipv4_is_multicast(oldflp->fl4_dst))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576 fl.fl4_src = inet_select_addr(dev_out, 0,
2577 fl.fl4_scope);
2578 else if (!oldflp->fl4_dst)
2579 fl.fl4_src = inet_select_addr(dev_out, 0,
2580 RT_SCOPE_HOST);
2581 }
2582 }
2583
2584 if (!fl.fl4_dst) {
2585 fl.fl4_dst = fl.fl4_src;
2586 if (!fl.fl4_dst)
2587 fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK);
2588 if (dev_out)
2589 dev_put(dev_out);
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002590 dev_out = net->loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 dev_hold(dev_out);
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002592 fl.oif = net->loopback_dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002593 res.type = RTN_LOCAL;
2594 flags |= RTCF_LOCAL;
2595 goto make_route;
2596 }
2597
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002598 if (fib_lookup(net, &fl, &res)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599 res.fi = NULL;
2600 if (oldflp->oif) {
2601 /* Apparently, routing tables are wrong. Assume,
2602 that the destination is on link.
2603
2604 WHY? DW.
2605 Because we are allowed to send to iface
2606 even if it has NO routes and NO assigned
2607 addresses. When oif is specified, routing
2608 tables are looked up with only one purpose:
2609 to catch if destination is gatewayed, rather than
2610 direct. Moreover, if MSG_DONTROUTE is set,
2611 we send packet, ignoring both routing tables
2612 and ifaddr state. --ANK
2613
2614
2615 We could make it even if oif is unknown,
2616 likely IPv6, but we do not.
2617 */
2618
2619 if (fl.fl4_src == 0)
2620 fl.fl4_src = inet_select_addr(dev_out, 0,
2621 RT_SCOPE_LINK);
2622 res.type = RTN_UNICAST;
2623 goto make_route;
2624 }
2625 if (dev_out)
2626 dev_put(dev_out);
2627 err = -ENETUNREACH;
2628 goto out;
2629 }
2630 free_res = 1;
2631
2632 if (res.type == RTN_LOCAL) {
2633 if (!fl.fl4_src)
2634 fl.fl4_src = fl.fl4_dst;
2635 if (dev_out)
2636 dev_put(dev_out);
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002637 dev_out = net->loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 dev_hold(dev_out);
2639 fl.oif = dev_out->ifindex;
2640 if (res.fi)
2641 fib_info_put(res.fi);
2642 res.fi = NULL;
2643 flags |= RTCF_LOCAL;
2644 goto make_route;
2645 }
2646
2647#ifdef CONFIG_IP_ROUTE_MULTIPATH
2648 if (res.fi->fib_nhs > 1 && fl.oif == 0)
2649 fib_select_multipath(&fl, &res);
2650 else
2651#endif
2652 if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif)
Denis V. Lunevb40afd02008-01-22 22:06:19 -08002653 fib_select_default(net, &fl, &res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654
2655 if (!fl.fl4_src)
2656 fl.fl4_src = FIB_RES_PREFSRC(res);
2657
2658 if (dev_out)
2659 dev_put(dev_out);
2660 dev_out = FIB_RES_DEV(res);
2661 dev_hold(dev_out);
2662 fl.oif = dev_out->ifindex;
2663
2664
2665make_route:
2666 err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags);
2667
2668
2669 if (free_res)
2670 fib_res_put(&res);
2671 if (dev_out)
2672 dev_put(dev_out);
2673out: return err;
2674}
2675
Denis V. Lunev611c1832008-01-22 22:06:48 -08002676int __ip_route_output_key(struct net *net, struct rtable **rp,
2677 const struct flowi *flp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002678{
2679 unsigned hash;
2680 struct rtable *rth;
2681
Neil Horman1080d702008-10-27 12:28:25 -07002682 if (!rt_caching(net))
2683 goto slow_output;
2684
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002685 hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif, rt_genid(net));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686
2687 rcu_read_lock_bh();
2688 for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
Eric Dumazet093c2ca2007-02-09 16:19:26 -08002689 rth = rcu_dereference(rth->u.dst.rt_next)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690 if (rth->fl.fl4_dst == flp->fl4_dst &&
2691 rth->fl.fl4_src == flp->fl4_src &&
2692 rth->fl.iif == 0 &&
2693 rth->fl.oif == flp->oif &&
Thomas Graf47dcf0c2006-11-09 15:20:38 -08002694 rth->fl.mark == flp->mark &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695 !((rth->fl.fl4_tos ^ flp->fl4_tos) &
Denis V. Lunevb5921912008-01-22 23:50:25 -08002696 (IPTOS_RT_MASK | RTO_ONLINK)) &&
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09002697 net_eq(dev_net(rth->u.dst.dev), net) &&
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002698 !rt_is_expired(rth)) {
Pavel Emelyanov03f49f32007-11-10 21:28:34 -08002699 dst_use(&rth->u.dst, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700 RT_CACHE_STAT_INC(out_hit);
2701 rcu_read_unlock_bh();
2702 *rp = rth;
2703 return 0;
2704 }
2705 RT_CACHE_STAT_INC(out_hlist_search);
2706 }
2707 rcu_read_unlock_bh();
2708
Neil Horman1080d702008-10-27 12:28:25 -07002709slow_output:
Denis V. Lunev611c1832008-01-22 22:06:48 -08002710 return ip_route_output_slow(net, rp, flp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711}
2712
Arnaldo Carvalho de Melod8c97a92005-08-09 20:12:12 -07002713EXPORT_SYMBOL_GPL(__ip_route_output_key);
2714
David S. Miller14e50e52007-05-24 18:17:54 -07002715static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
2716{
2717}
2718
2719static struct dst_ops ipv4_dst_blackhole_ops = {
2720 .family = AF_INET,
Harvey Harrison09640e62009-02-01 00:45:17 -08002721 .protocol = cpu_to_be16(ETH_P_IP),
David S. Miller14e50e52007-05-24 18:17:54 -07002722 .destroy = ipv4_dst_destroy,
2723 .check = ipv4_dst_check,
2724 .update_pmtu = ipv4_rt_blackhole_update_pmtu,
Eric Dumazete2422972008-01-30 20:07:45 -08002725 .entries = ATOMIC_INIT(0),
David S. Miller14e50e52007-05-24 18:17:54 -07002726};
2727
2728
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002729static int ipv4_dst_blackhole(struct net *net, struct rtable **rp, struct flowi *flp)
David S. Miller14e50e52007-05-24 18:17:54 -07002730{
2731 struct rtable *ort = *rp;
2732 struct rtable *rt = (struct rtable *)
2733 dst_alloc(&ipv4_dst_blackhole_ops);
2734
2735 if (rt) {
2736 struct dst_entry *new = &rt->u.dst;
2737
2738 atomic_set(&new->__refcnt, 1);
2739 new->__use = 1;
Herbert Xu352e5122007-11-13 21:34:06 -08002740 new->input = dst_discard;
2741 new->output = dst_discard;
David S. Miller14e50e52007-05-24 18:17:54 -07002742 memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
2743
2744 new->dev = ort->u.dst.dev;
2745 if (new->dev)
2746 dev_hold(new->dev);
2747
2748 rt->fl = ort->fl;
2749
2750 rt->idev = ort->idev;
2751 if (rt->idev)
2752 in_dev_hold(rt->idev);
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002753 rt->rt_genid = rt_genid(net);
David S. Miller14e50e52007-05-24 18:17:54 -07002754 rt->rt_flags = ort->rt_flags;
2755 rt->rt_type = ort->rt_type;
2756 rt->rt_dst = ort->rt_dst;
2757 rt->rt_src = ort->rt_src;
2758 rt->rt_iif = ort->rt_iif;
2759 rt->rt_gateway = ort->rt_gateway;
2760 rt->rt_spec_dst = ort->rt_spec_dst;
2761 rt->peer = ort->peer;
2762 if (rt->peer)
2763 atomic_inc(&rt->peer->refcnt);
2764
2765 dst_free(new);
2766 }
2767
2768 dst_release(&(*rp)->u.dst);
2769 *rp = rt;
2770 return (rt ? 0 : -ENOMEM);
2771}
2772
Denis V. Lunevf1b050b2008-01-22 22:07:10 -08002773int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp,
2774 struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002775{
2776 int err;
2777
Denis V. Lunevf1b050b2008-01-22 22:07:10 -08002778 if ((err = __ip_route_output_key(net, rp, flp)) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002779 return err;
2780
2781 if (flp->proto) {
2782 if (!flp->fl4_src)
2783 flp->fl4_src = (*rp)->rt_src;
2784 if (!flp->fl4_dst)
2785 flp->fl4_dst = (*rp)->rt_dst;
Alexey Dobriyan52479b62008-11-25 17:35:18 -08002786 err = __xfrm_lookup(net, (struct dst_entry **)rp, flp, sk,
Herbert Xubb728452007-12-12 18:48:58 -08002787 flags ? XFRM_LOOKUP_WAIT : 0);
David S. Miller14e50e52007-05-24 18:17:54 -07002788 if (err == -EREMOTE)
Denis V. Luneve84f84f2008-07-05 19:04:32 -07002789 err = ipv4_dst_blackhole(net, rp, flp);
David S. Miller14e50e52007-05-24 18:17:54 -07002790
2791 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002792 }
2793
2794 return 0;
2795}
2796
Arnaldo Carvalho de Melod8c97a92005-08-09 20:12:12 -07002797EXPORT_SYMBOL_GPL(ip_route_output_flow);
2798
Denis V. Lunevf2063512008-01-22 22:07:34 -08002799int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800{
Denis V. Lunevf2063512008-01-22 22:07:34 -08002801 return ip_route_output_flow(net, rp, flp, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002802}
2803
Benjamin Thery4feb88e2009-01-22 04:56:23 +00002804static int rt_fill_info(struct net *net,
2805 struct sk_buff *skb, u32 pid, u32 seq, int event,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07002806 int nowait, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002807{
Eric Dumazet511c3f92009-06-02 05:14:27 +00002808 struct rtable *rt = skb_rtable(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809 struct rtmsg *r;
Thomas Grafbe403ea2006-08-17 18:15:17 -07002810 struct nlmsghdr *nlh;
Thomas Grafe3703b32006-11-27 09:27:07 -08002811 long expires;
2812 u32 id = 0, ts = 0, tsage = 0, error;
Thomas Grafbe403ea2006-08-17 18:15:17 -07002813
2814 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags);
2815 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -08002816 return -EMSGSIZE;
Thomas Grafbe403ea2006-08-17 18:15:17 -07002817
2818 r = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819 r->rtm_family = AF_INET;
2820 r->rtm_dst_len = 32;
2821 r->rtm_src_len = 0;
2822 r->rtm_tos = rt->fl.fl4_tos;
2823 r->rtm_table = RT_TABLE_MAIN;
Thomas Grafbe403ea2006-08-17 18:15:17 -07002824 NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002825 r->rtm_type = rt->rt_type;
2826 r->rtm_scope = RT_SCOPE_UNIVERSE;
2827 r->rtm_protocol = RTPROT_UNSPEC;
2828 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
2829 if (rt->rt_flags & RTCF_NOTIFY)
2830 r->rtm_flags |= RTM_F_NOTIFY;
Thomas Grafbe403ea2006-08-17 18:15:17 -07002831
Al Viro17fb2c62006-09-26 22:15:25 -07002832 NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst);
Thomas Grafbe403ea2006-08-17 18:15:17 -07002833
Linus Torvalds1da177e2005-04-16 15:20:36 -07002834 if (rt->fl.fl4_src) {
2835 r->rtm_src_len = 32;
Al Viro17fb2c62006-09-26 22:15:25 -07002836 NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837 }
2838 if (rt->u.dst.dev)
Thomas Grafbe403ea2006-08-17 18:15:17 -07002839 NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840#ifdef CONFIG_NET_CLS_ROUTE
2841 if (rt->u.dst.tclassid)
Thomas Grafbe403ea2006-08-17 18:15:17 -07002842 NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844 if (rt->fl.iif)
Al Viro17fb2c62006-09-26 22:15:25 -07002845 NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 else if (rt->rt_src != rt->fl.fl4_src)
Al Viro17fb2c62006-09-26 22:15:25 -07002847 NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src);
Thomas Grafbe403ea2006-08-17 18:15:17 -07002848
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849 if (rt->rt_dst != rt->rt_gateway)
Al Viro17fb2c62006-09-26 22:15:25 -07002850 NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway);
Thomas Grafbe403ea2006-08-17 18:15:17 -07002851
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
Thomas Grafbe403ea2006-08-17 18:15:17 -07002853 goto nla_put_failure;
2854
Thomas Grafe3703b32006-11-27 09:27:07 -08002855 error = rt->u.dst.error;
2856 expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002857 if (rt->peer) {
Thomas Grafe3703b32006-11-27 09:27:07 -08002858 id = rt->peer->ip_id_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002859 if (rt->peer->tcp_ts_stamp) {
Thomas Grafe3703b32006-11-27 09:27:07 -08002860 ts = rt->peer->tcp_ts;
James Morris9d729f72007-03-04 16:12:44 -08002861 tsage = get_seconds() - rt->peer->tcp_ts_stamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002862 }
2863 }
Thomas Grafbe403ea2006-08-17 18:15:17 -07002864
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865 if (rt->fl.iif) {
2866#ifdef CONFIG_IP_MROUTE
Al Viroe4485152006-09-26 22:15:01 -07002867 __be32 dst = rt->rt_dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868
Joe Perchesf97c1e02007-12-16 13:45:43 -08002869 if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) &&
Benjamin Thery4feb88e2009-01-22 04:56:23 +00002870 IPV4_DEVCONF_ALL(net, MC_FORWARDING)) {
2871 int err = ipmr_get_route(net, skb, r, nowait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002872 if (err <= 0) {
2873 if (!nowait) {
2874 if (err == 0)
2875 return 0;
Thomas Grafbe403ea2006-08-17 18:15:17 -07002876 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 } else {
2878 if (err == -EMSGSIZE)
Thomas Grafbe403ea2006-08-17 18:15:17 -07002879 goto nla_put_failure;
Thomas Grafe3703b32006-11-27 09:27:07 -08002880 error = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881 }
2882 }
2883 } else
2884#endif
Thomas Grafbe403ea2006-08-17 18:15:17 -07002885 NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 }
2887
Thomas Grafe3703b32006-11-27 09:27:07 -08002888 if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage,
2889 expires, error) < 0)
2890 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891
Thomas Grafbe403ea2006-08-17 18:15:17 -07002892 return nlmsg_end(skb, nlh);
2893
2894nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08002895 nlmsg_cancel(skb, nlh);
2896 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897}
2898
Thomas Graf63f34442007-03-22 11:55:17 -07002899static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002901 struct net *net = sock_net(in_skb->sk);
Thomas Grafd889ce32006-08-17 18:15:44 -07002902 struct rtmsg *rtm;
2903 struct nlattr *tb[RTA_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904 struct rtable *rt = NULL;
Al Viro9e12bb22006-09-26 21:25:20 -07002905 __be32 dst = 0;
2906 __be32 src = 0;
2907 u32 iif;
Thomas Grafd889ce32006-08-17 18:15:44 -07002908 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909 struct sk_buff *skb;
2910
Thomas Grafd889ce32006-08-17 18:15:44 -07002911 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy);
2912 if (err < 0)
2913 goto errout;
2914
2915 rtm = nlmsg_data(nlh);
2916
Linus Torvalds1da177e2005-04-16 15:20:36 -07002917 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
Thomas Grafd889ce32006-08-17 18:15:44 -07002918 if (skb == NULL) {
2919 err = -ENOBUFS;
2920 goto errout;
2921 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002922
2923 /* Reserve room for dummy headers, this skb can pass
2924 through good chunk of routing engine.
2925 */
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07002926 skb_reset_mac_header(skb);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07002927 skb_reset_network_header(skb);
Stephen Hemmingerd2c962b2006-04-17 17:27:11 -07002928
2929 /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07002930 ip_hdr(skb)->protocol = IPPROTO_ICMP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931 skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr));
2932
Al Viro17fb2c62006-09-26 22:15:25 -07002933 src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0;
2934 dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0;
Thomas Grafd889ce32006-08-17 18:15:44 -07002935 iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002936
2937 if (iif) {
Thomas Grafd889ce32006-08-17 18:15:44 -07002938 struct net_device *dev;
2939
Denis V. Lunev19375042008-02-28 20:52:04 -08002940 dev = __dev_get_by_index(net, iif);
Thomas Grafd889ce32006-08-17 18:15:44 -07002941 if (dev == NULL) {
2942 err = -ENODEV;
2943 goto errout_free;
2944 }
2945
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946 skb->protocol = htons(ETH_P_IP);
2947 skb->dev = dev;
2948 local_bh_disable();
2949 err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev);
2950 local_bh_enable();
Thomas Grafd889ce32006-08-17 18:15:44 -07002951
Eric Dumazet511c3f92009-06-02 05:14:27 +00002952 rt = skb_rtable(skb);
Thomas Grafd889ce32006-08-17 18:15:44 -07002953 if (err == 0 && rt->u.dst.error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002954 err = -rt->u.dst.error;
2955 } else {
Thomas Grafd889ce32006-08-17 18:15:44 -07002956 struct flowi fl = {
2957 .nl_u = {
2958 .ip4_u = {
2959 .daddr = dst,
2960 .saddr = src,
2961 .tos = rtm->rtm_tos,
2962 },
2963 },
2964 .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0,
2965 };
Denis V. Lunev19375042008-02-28 20:52:04 -08002966 err = ip_route_output_key(net, &rt, &fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967 }
Thomas Grafd889ce32006-08-17 18:15:44 -07002968
Linus Torvalds1da177e2005-04-16 15:20:36 -07002969 if (err)
Thomas Grafd889ce32006-08-17 18:15:44 -07002970 goto errout_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971
Eric Dumazetadf30902009-06-02 05:19:30 +00002972 skb_dst_set(skb, &rt->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973 if (rtm->rtm_flags & RTM_F_NOTIFY)
2974 rt->rt_flags |= RTCF_NOTIFY;
2975
Benjamin Thery4feb88e2009-01-22 04:56:23 +00002976 err = rt_fill_info(net, skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
Denis V. Lunev19375042008-02-28 20:52:04 -08002977 RTM_NEWROUTE, 0, 0);
Thomas Grafd889ce32006-08-17 18:15:44 -07002978 if (err <= 0)
2979 goto errout_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002980
Denis V. Lunev19375042008-02-28 20:52:04 -08002981 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
Thomas Grafd889ce32006-08-17 18:15:44 -07002982errout:
Thomas Graf2942e902006-08-15 00:30:25 -07002983 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002984
Thomas Grafd889ce32006-08-17 18:15:44 -07002985errout_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 kfree_skb(skb);
Thomas Grafd889ce32006-08-17 18:15:44 -07002987 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988}
2989
2990int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb)
2991{
2992 struct rtable *rt;
2993 int h, s_h;
2994 int idx, s_idx;
Denis V. Lunev19375042008-02-28 20:52:04 -08002995 struct net *net;
2996
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002997 net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998
2999 s_h = cb->args[0];
Eric Dumazetd8c92832008-01-07 21:52:14 -08003000 if (s_h < 0)
3001 s_h = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003002 s_idx = idx = cb->args[1];
Eric Dumazeta6272662008-08-28 01:11:25 -07003003 for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) {
3004 if (!rt_hash_table[h].chain)
3005 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003006 rcu_read_lock_bh();
3007 for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt;
Eric Dumazet093c2ca2007-02-09 16:19:26 -08003008 rt = rcu_dereference(rt->u.dst.rt_next), idx++) {
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +09003009 if (!net_eq(dev_net(rt->u.dst.dev), net) || idx < s_idx)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003010 continue;
Denis V. Luneve84f84f2008-07-05 19:04:32 -07003011 if (rt_is_expired(rt))
Eric Dumazet29e75252008-01-31 17:05:09 -08003012 continue;
Eric Dumazetadf30902009-06-02 05:19:30 +00003013 skb_dst_set(skb, dst_clone(&rt->u.dst));
Benjamin Thery4feb88e2009-01-22 04:56:23 +00003014 if (rt_fill_info(net, skb, NETLINK_CB(cb->skb).pid,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09003015 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07003016 1, NLM_F_MULTI) <= 0) {
Eric Dumazetadf30902009-06-02 05:19:30 +00003017 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 rcu_read_unlock_bh();
3019 goto done;
3020 }
Eric Dumazetadf30902009-06-02 05:19:30 +00003021 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022 }
3023 rcu_read_unlock_bh();
3024 }
3025
3026done:
3027 cb->args[0] = h;
3028 cb->args[1] = idx;
3029 return skb->len;
3030}
3031
3032void ip_rt_multicast_event(struct in_device *in_dev)
3033{
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07003034 rt_cache_flush(dev_net(in_dev->dev), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003035}
3036
3037#ifdef CONFIG_SYSCTL
Denis V. Lunev81c684d2008-07-08 03:05:28 -07003038static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07003039 void __user *buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040 size_t *lenp, loff_t *ppos)
3041{
3042 if (write) {
Denis V. Lunev639e1042008-07-05 19:02:06 -07003043 int flush_delay;
Denis V. Lunev81c684d2008-07-08 03:05:28 -07003044 ctl_table ctl;
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003045 struct net *net;
Denis V. Lunev639e1042008-07-05 19:02:06 -07003046
Denis V. Lunev81c684d2008-07-08 03:05:28 -07003047 memcpy(&ctl, __ctl, sizeof(ctl));
3048 ctl.data = &flush_delay;
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07003049 proc_dointvec(&ctl, write, buffer, lenp, ppos);
Denis V. Lunev639e1042008-07-05 19:02:06 -07003050
Denis V. Lunev81c684d2008-07-08 03:05:28 -07003051 net = (struct net *)__ctl->extra1;
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003052 rt_cache_flush(net, flush_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 return 0;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09003054 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055
3056 return -EINVAL;
3057}
3058
3059static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003060 void __user *oldval,
3061 size_t __user *oldlenp,
3062 void __user *newval,
Alexey Dobriyan1f29bcd2006-12-10 02:19:10 -08003063 size_t newlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003064{
3065 int delay;
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003066 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067 if (newlen != sizeof(int))
3068 return -EINVAL;
3069 if (get_user(delay, (int __user *)newval))
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09003070 return -EFAULT;
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003071 net = (struct net *)table->extra1;
3072 rt_cache_flush(net, delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003073 return 0;
3074}
3075
Herbert Xuc6153b52008-08-15 13:44:31 -07003076static void rt_secret_reschedule(int old)
3077{
3078 struct net *net;
3079 int new = ip_rt_secret_interval;
3080 int diff = new - old;
3081
3082 if (!diff)
3083 return;
3084
3085 rtnl_lock();
3086 for_each_net(net) {
3087 int deleted = del_timer_sync(&net->ipv4.rt_secret_timer);
3088
3089 if (!new)
3090 continue;
3091
3092 if (deleted) {
3093 long time = net->ipv4.rt_secret_timer.expires - jiffies;
3094
3095 if (time <= 0 || (time += diff) <= 0)
3096 time = 0;
3097
3098 net->ipv4.rt_secret_timer.expires = time;
3099 } else
3100 net->ipv4.rt_secret_timer.expires = new;
3101
3102 net->ipv4.rt_secret_timer.expires += jiffies;
3103 add_timer(&net->ipv4.rt_secret_timer);
3104 }
3105 rtnl_unlock();
3106}
3107
3108static int ipv4_sysctl_rt_secret_interval(ctl_table *ctl, int write,
Herbert Xuc6153b52008-08-15 13:44:31 -07003109 void __user *buffer, size_t *lenp,
3110 loff_t *ppos)
3111{
3112 int old = ip_rt_secret_interval;
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07003113 int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos);
Herbert Xuc6153b52008-08-15 13:44:31 -07003114
3115 rt_secret_reschedule(old);
3116
3117 return ret;
3118}
3119
3120static int ipv4_sysctl_rt_secret_interval_strategy(ctl_table *table,
Herbert Xuc6153b52008-08-15 13:44:31 -07003121 void __user *oldval,
3122 size_t __user *oldlenp,
3123 void __user *newval,
3124 size_t newlen)
3125{
3126 int old = ip_rt_secret_interval;
Alexey Dobriyanf221e722008-10-15 22:04:23 -07003127 int ret = sysctl_jiffies(table, oldval, oldlenp, newval, newlen);
Herbert Xuc6153b52008-08-15 13:44:31 -07003128
3129 rt_secret_reschedule(old);
3130
3131 return ret;
3132}
3133
Al Viroeeb61f72008-07-27 08:59:33 +01003134static ctl_table ipv4_route_table[] = {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09003135 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003136 .ctl_name = NET_IPV4_ROUTE_GC_THRESH,
3137 .procname = "gc_thresh",
3138 .data = &ipv4_dst_ops.gc_thresh,
3139 .maxlen = sizeof(int),
3140 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003141 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003142 },
3143 {
3144 .ctl_name = NET_IPV4_ROUTE_MAX_SIZE,
3145 .procname = "max_size",
3146 .data = &ip_rt_max_size,
3147 .maxlen = sizeof(int),
3148 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003149 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003150 },
3151 {
3152 /* Deprecated. Use gc_min_interval_ms */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09003153
Linus Torvalds1da177e2005-04-16 15:20:36 -07003154 .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL,
3155 .procname = "gc_min_interval",
3156 .data = &ip_rt_gc_min_interval,
3157 .maxlen = sizeof(int),
3158 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003159 .proc_handler = proc_dointvec_jiffies,
3160 .strategy = sysctl_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003161 },
3162 {
3163 .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS,
3164 .procname = "gc_min_interval_ms",
3165 .data = &ip_rt_gc_min_interval,
3166 .maxlen = sizeof(int),
3167 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003168 .proc_handler = proc_dointvec_ms_jiffies,
3169 .strategy = sysctl_ms_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003170 },
3171 {
3172 .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT,
3173 .procname = "gc_timeout",
3174 .data = &ip_rt_gc_timeout,
3175 .maxlen = sizeof(int),
3176 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003177 .proc_handler = proc_dointvec_jiffies,
3178 .strategy = sysctl_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003179 },
3180 {
3181 .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL,
3182 .procname = "gc_interval",
3183 .data = &ip_rt_gc_interval,
3184 .maxlen = sizeof(int),
3185 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003186 .proc_handler = proc_dointvec_jiffies,
3187 .strategy = sysctl_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003188 },
3189 {
3190 .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD,
3191 .procname = "redirect_load",
3192 .data = &ip_rt_redirect_load,
3193 .maxlen = sizeof(int),
3194 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003195 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003196 },
3197 {
3198 .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER,
3199 .procname = "redirect_number",
3200 .data = &ip_rt_redirect_number,
3201 .maxlen = sizeof(int),
3202 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003203 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003204 },
3205 {
3206 .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE,
3207 .procname = "redirect_silence",
3208 .data = &ip_rt_redirect_silence,
3209 .maxlen = sizeof(int),
3210 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003211 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212 },
3213 {
3214 .ctl_name = NET_IPV4_ROUTE_ERROR_COST,
3215 .procname = "error_cost",
3216 .data = &ip_rt_error_cost,
3217 .maxlen = sizeof(int),
3218 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003219 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003220 },
3221 {
3222 .ctl_name = NET_IPV4_ROUTE_ERROR_BURST,
3223 .procname = "error_burst",
3224 .data = &ip_rt_error_burst,
3225 .maxlen = sizeof(int),
3226 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003227 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003228 },
3229 {
3230 .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY,
3231 .procname = "gc_elasticity",
3232 .data = &ip_rt_gc_elasticity,
3233 .maxlen = sizeof(int),
3234 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003235 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236 },
3237 {
3238 .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES,
3239 .procname = "mtu_expires",
3240 .data = &ip_rt_mtu_expires,
3241 .maxlen = sizeof(int),
3242 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003243 .proc_handler = proc_dointvec_jiffies,
3244 .strategy = sysctl_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245 },
3246 {
3247 .ctl_name = NET_IPV4_ROUTE_MIN_PMTU,
3248 .procname = "min_pmtu",
3249 .data = &ip_rt_min_pmtu,
3250 .maxlen = sizeof(int),
3251 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003252 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003253 },
3254 {
3255 .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS,
3256 .procname = "min_adv_mss",
3257 .data = &ip_rt_min_advmss,
3258 .maxlen = sizeof(int),
3259 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003260 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003261 },
3262 {
3263 .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL,
3264 .procname = "secret_interval",
3265 .data = &ip_rt_secret_interval,
3266 .maxlen = sizeof(int),
3267 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003268 .proc_handler = ipv4_sysctl_rt_secret_interval,
3269 .strategy = ipv4_sysctl_rt_secret_interval_strategy,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003270 },
3271 { .ctl_name = 0 }
3272};
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003273
Al Viro2f4520d2008-08-25 15:17:44 -07003274static struct ctl_table empty[1];
3275
3276static struct ctl_table ipv4_skeleton[] =
3277{
3278 { .procname = "route", .ctl_name = NET_IPV4_ROUTE,
Hugh Dickinsd994af02008-08-27 02:35:18 -07003279 .mode = 0555, .child = ipv4_route_table},
Al Viro2f4520d2008-08-25 15:17:44 -07003280 { .procname = "neigh", .ctl_name = NET_IPV4_NEIGH,
Hugh Dickinsd994af02008-08-27 02:35:18 -07003281 .mode = 0555, .child = empty},
Al Viro2f4520d2008-08-25 15:17:44 -07003282 { }
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003283};
3284
Al Viro2f4520d2008-08-25 15:17:44 -07003285static __net_initdata struct ctl_path ipv4_path[] = {
3286 { .procname = "net", .ctl_name = CTL_NET, },
3287 { .procname = "ipv4", .ctl_name = NET_IPV4, },
3288 { },
3289};
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003290
3291static struct ctl_table ipv4_route_flush_table[] = {
3292 {
3293 .ctl_name = NET_IPV4_ROUTE_FLUSH,
3294 .procname = "flush",
3295 .maxlen = sizeof(int),
3296 .mode = 0200,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -08003297 .proc_handler = ipv4_sysctl_rtcache_flush,
3298 .strategy = ipv4_sysctl_rtcache_flush_strategy,
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003299 },
3300 { .ctl_name = 0 },
3301};
3302
Al Viro2f4520d2008-08-25 15:17:44 -07003303static __net_initdata struct ctl_path ipv4_route_path[] = {
3304 { .procname = "net", .ctl_name = CTL_NET, },
3305 { .procname = "ipv4", .ctl_name = NET_IPV4, },
3306 { .procname = "route", .ctl_name = NET_IPV4_ROUTE, },
3307 { },
3308};
3309
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003310static __net_init int sysctl_route_net_init(struct net *net)
3311{
3312 struct ctl_table *tbl;
3313
3314 tbl = ipv4_route_flush_table;
3315 if (net != &init_net) {
3316 tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL);
3317 if (tbl == NULL)
3318 goto err_dup;
3319 }
3320 tbl[0].extra1 = net;
3321
3322 net->ipv4.route_hdr =
3323 register_net_sysctl_table(net, ipv4_route_path, tbl);
3324 if (net->ipv4.route_hdr == NULL)
3325 goto err_reg;
3326 return 0;
3327
3328err_reg:
3329 if (tbl != ipv4_route_flush_table)
3330 kfree(tbl);
3331err_dup:
3332 return -ENOMEM;
3333}
3334
3335static __net_exit void sysctl_route_net_exit(struct net *net)
3336{
3337 struct ctl_table *tbl;
3338
3339 tbl = net->ipv4.route_hdr->ctl_table_arg;
3340 unregister_net_sysctl_table(net->ipv4.route_hdr);
3341 BUG_ON(tbl == ipv4_route_flush_table);
3342 kfree(tbl);
3343}
3344
3345static __net_initdata struct pernet_operations sysctl_route_ops = {
3346 .init = sysctl_route_net_init,
3347 .exit = sysctl_route_net_exit,
3348};
Linus Torvalds1da177e2005-04-16 15:20:36 -07003349#endif
3350
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -07003351
3352static __net_init int rt_secret_timer_init(struct net *net)
3353{
Denis V. Luneve84f84f2008-07-05 19:04:32 -07003354 atomic_set(&net->ipv4.rt_genid,
3355 (int) ((num_physpages ^ (num_physpages>>8)) ^
3356 (jiffies ^ (jiffies >> 7))));
3357
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -07003358 net->ipv4.rt_secret_timer.function = rt_secret_rebuild;
3359 net->ipv4.rt_secret_timer.data = (unsigned long)net;
3360 init_timer_deferrable(&net->ipv4.rt_secret_timer);
3361
Herbert Xuc6153b52008-08-15 13:44:31 -07003362 if (ip_rt_secret_interval) {
3363 net->ipv4.rt_secret_timer.expires =
3364 jiffies + net_random() % ip_rt_secret_interval +
3365 ip_rt_secret_interval;
3366 add_timer(&net->ipv4.rt_secret_timer);
3367 }
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -07003368 return 0;
3369}
3370
3371static __net_exit void rt_secret_timer_exit(struct net *net)
3372{
3373 del_timer_sync(&net->ipv4.rt_secret_timer);
3374}
3375
3376static __net_initdata struct pernet_operations rt_secret_timer_ops = {
3377 .init = rt_secret_timer_init,
3378 .exit = rt_secret_timer_exit,
3379};
3380
3381
Linus Torvalds1da177e2005-04-16 15:20:36 -07003382#ifdef CONFIG_NET_CLS_ROUTE
Eric Dumazet8dbde282007-11-16 03:32:10 -08003383struct ip_rt_acct *ip_rt_acct __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003384#endif /* CONFIG_NET_CLS_ROUTE */
3385
3386static __initdata unsigned long rhash_entries;
3387static int __init set_rhash_entries(char *str)
3388{
3389 if (!str)
3390 return 0;
3391 rhash_entries = simple_strtoul(str, &str, 0);
3392 return 1;
3393}
3394__setup("rhash_entries=", set_rhash_entries);
3395
3396int __init ip_rt_init(void)
3397{
Eric Dumazet424c4b72005-07-05 14:58:19 -07003398 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003399
Linus Torvalds1da177e2005-04-16 15:20:36 -07003400#ifdef CONFIG_NET_CLS_ROUTE
Ingo Molnar0dcec8c2009-02-25 14:07:33 +01003401 ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003402 if (!ip_rt_acct)
3403 panic("IP: failed to allocate ip_rt_acct\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003404#endif
3405
Alexey Dobriyane5d679f332006-08-26 19:25:52 -07003406 ipv4_dst_ops.kmem_cachep =
3407 kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09003408 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003409
David S. Miller14e50e52007-05-24 18:17:54 -07003410 ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep;
3411
Eric Dumazet424c4b72005-07-05 14:58:19 -07003412 rt_hash_table = (struct rt_hash_bucket *)
3413 alloc_large_system_hash("IP route cache",
3414 sizeof(struct rt_hash_bucket),
3415 rhash_entries,
Jan Beulich44813742009-09-21 17:03:05 -07003416 (totalram_pages >= 128 * 1024) ?
Mike Stroyan18955cf2005-11-29 16:12:55 -08003417 15 : 17,
Kirill Korotaev8d1502d2006-08-07 20:44:22 -07003418 0,
Eric Dumazet424c4b72005-07-05 14:58:19 -07003419 &rt_hash_log,
3420 &rt_hash_mask,
Anton Blanchardc9503e02009-04-27 05:42:24 -07003421 rhash_entries ? 0 : 512 * 1024);
Eric Dumazet22c047c2005-07-05 14:55:24 -07003422 memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket));
3423 rt_hash_lock_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003424
3425 ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1);
3426 ip_rt_max_size = (rt_hash_mask + 1) * 16;
3427
Linus Torvalds1da177e2005-04-16 15:20:36 -07003428 devinet_init();
3429 ip_fib_init();
3430
Linus Torvalds1da177e2005-04-16 15:20:36 -07003431 /* All the timers, started at system startup tend
3432 to synchronize. Perturb it a bit.
3433 */
Eric Dumazet125bb8f2009-06-11 20:10:07 +00003434 INIT_DELAYED_WORK_DEFERRABLE(&expires_work, rt_worker_func);
3435 expires_ljiffies = jiffies;
Eric Dumazet39c90ec2007-09-15 10:55:54 -07003436 schedule_delayed_work(&expires_work,
3437 net_random() % ip_rt_gc_interval + ip_rt_gc_interval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003438
Denis V. Lunev9f5e97e2008-07-05 19:02:59 -07003439 if (register_pernet_subsys(&rt_secret_timer_ops))
3440 printk(KERN_ERR "Unable to setup rt_secret_timer\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003441
Denis V. Lunev73b38712008-02-28 20:51:18 -08003442 if (ip_rt_proc_init())
Pavel Emelyanov107f1632007-12-05 21:14:28 -08003443 printk(KERN_ERR "Unable to create route proc files\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003444#ifdef CONFIG_XFRM
3445 xfrm_init();
Neil Hormana33bc5c2009-07-30 18:52:15 -07003446 xfrm4_init(ip_rt_max_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003447#endif
Thomas Graf63f34442007-03-22 11:55:17 -07003448 rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL);
3449
Denis V. Lunev39a23e72008-07-05 19:02:33 -07003450#ifdef CONFIG_SYSCTL
3451 register_pernet_subsys(&sysctl_route_ops);
3452#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003453 return rc;
3454}
3455
Al Viroa1bc6eb2008-07-30 06:32:52 -04003456#ifdef CONFIG_SYSCTL
Al Viroeeb61f72008-07-27 08:59:33 +01003457/*
3458 * We really need to sanitize the damn ipv4 init order, then all
3459 * this nonsense will go away.
3460 */
3461void __init ip_static_sysctl_init(void)
3462{
Al Viro2f4520d2008-08-25 15:17:44 -07003463 register_sysctl_paths(ipv4_path, ipv4_skeleton);
Al Viroeeb61f72008-07-27 08:59:33 +01003464}
Al Viroa1bc6eb2008-07-30 06:32:52 -04003465#endif
Al Viroeeb61f72008-07-27 08:59:33 +01003466
Linus Torvalds1da177e2005-04-16 15:20:36 -07003467EXPORT_SYMBOL(__ip_select_ident);
3468EXPORT_SYMBOL(ip_route_input);
3469EXPORT_SYMBOL(ip_route_output_key);