Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * ROUTE - implementation of the IP router. |
| 7 | * |
| 8 | * Version: $Id: route.c,v 1.103 2002/01/12 07:44:09 davem Exp $ |
| 9 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 13 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> |
| 14 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 15 | * |
| 16 | * Fixes: |
| 17 | * Alan Cox : Verify area fixes. |
| 18 | * Alan Cox : cli() protects routing changes |
| 19 | * Rui Oliveira : ICMP routing table updates |
| 20 | * (rco@di.uminho.pt) Routing table insertion and update |
| 21 | * Linus Torvalds : Rewrote bits to be sensible |
| 22 | * Alan Cox : Added BSD route gw semantics |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 23 | * Alan Cox : Super /proc >4K |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * Alan Cox : MTU in route table |
| 25 | * Alan Cox : MSS actually. Also added the window |
| 26 | * clamper. |
| 27 | * Sam Lantinga : Fixed route matching in rt_del() |
| 28 | * Alan Cox : Routing cache support. |
| 29 | * Alan Cox : Removed compatibility cruft. |
| 30 | * Alan Cox : RTF_REJECT support. |
| 31 | * Alan Cox : TCP irtt support. |
| 32 | * Jonathan Naylor : Added Metric support. |
| 33 | * Miquel van Smoorenburg : BSD API fixes. |
| 34 | * Miquel van Smoorenburg : Metrics. |
| 35 | * Alan Cox : Use __u32 properly |
| 36 | * Alan Cox : Aligned routing errors more closely with BSD |
| 37 | * our system is still very different. |
| 38 | * Alan Cox : Faster /proc handling |
| 39 | * Alexey Kuznetsov : Massive rework to support tree based routing, |
| 40 | * routing caches and better behaviour. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 41 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | * Olaf Erb : irtt wasn't being copied right. |
| 43 | * Bjorn Ekwall : Kerneld route support. |
| 44 | * Alan Cox : Multicast fixed (I hope) |
| 45 | * Pavel Krauz : Limited broadcast fixed |
| 46 | * Mike McLagan : Routing by source |
| 47 | * Alexey Kuznetsov : End of old history. Split to fib.c and |
| 48 | * route.c and rewritten from scratch. |
| 49 | * Andi Kleen : Load-limit warning messages. |
| 50 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
| 51 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. |
| 52 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. |
| 53 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. |
| 54 | * Marc Boucher : routing by fwmark |
| 55 | * Robert Olsson : Added rt_cache statistics |
| 56 | * Arnaldo C. Melo : Convert proc stuff to seq_file |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 57 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 58 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
| 59 | * Ilia Sotnikov : Removed TOS from hash calculations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | * |
| 61 | * This program is free software; you can redistribute it and/or |
| 62 | * modify it under the terms of the GNU General Public License |
| 63 | * as published by the Free Software Foundation; either version |
| 64 | * 2 of the License, or (at your option) any later version. |
| 65 | */ |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <linux/module.h> |
| 68 | #include <asm/uaccess.h> |
| 69 | #include <asm/system.h> |
| 70 | #include <linux/bitops.h> |
| 71 | #include <linux/types.h> |
| 72 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #include <linux/mm.h> |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 74 | #include <linux/bootmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #include <linux/string.h> |
| 76 | #include <linux/socket.h> |
| 77 | #include <linux/sockios.h> |
| 78 | #include <linux/errno.h> |
| 79 | #include <linux/in.h> |
| 80 | #include <linux/inet.h> |
| 81 | #include <linux/netdevice.h> |
| 82 | #include <linux/proc_fs.h> |
| 83 | #include <linux/init.h> |
| 84 | #include <linux/skbuff.h> |
| 85 | #include <linux/rtnetlink.h> |
| 86 | #include <linux/inetdevice.h> |
| 87 | #include <linux/igmp.h> |
| 88 | #include <linux/pkt_sched.h> |
| 89 | #include <linux/mroute.h> |
| 90 | #include <linux/netfilter_ipv4.h> |
| 91 | #include <linux/random.h> |
| 92 | #include <linux/jhash.h> |
| 93 | #include <linux/rcupdate.h> |
| 94 | #include <linux/times.h> |
| 95 | #include <net/protocol.h> |
| 96 | #include <net/ip.h> |
| 97 | #include <net/route.h> |
| 98 | #include <net/inetpeer.h> |
| 99 | #include <net/sock.h> |
| 100 | #include <net/ip_fib.h> |
| 101 | #include <net/arp.h> |
| 102 | #include <net/tcp.h> |
| 103 | #include <net/icmp.h> |
| 104 | #include <net/xfrm.h> |
| 105 | #include <net/ip_mp_alg.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 106 | #include <net/netevent.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #ifdef CONFIG_SYSCTL |
| 108 | #include <linux/sysctl.h> |
| 109 | #endif |
| 110 | |
| 111 | #define RT_FL_TOS(oldflp) \ |
| 112 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) |
| 113 | |
| 114 | #define IP_MAX_MTU 0xFFF0 |
| 115 | |
| 116 | #define RT_GC_TIMEOUT (300*HZ) |
| 117 | |
| 118 | static int ip_rt_min_delay = 2 * HZ; |
| 119 | static int ip_rt_max_delay = 10 * HZ; |
| 120 | static int ip_rt_max_size; |
| 121 | static int ip_rt_gc_timeout = RT_GC_TIMEOUT; |
| 122 | static int ip_rt_gc_interval = 60 * HZ; |
| 123 | static int ip_rt_gc_min_interval = HZ / 2; |
| 124 | static int ip_rt_redirect_number = 9; |
| 125 | static int ip_rt_redirect_load = HZ / 50; |
| 126 | static int ip_rt_redirect_silence = ((HZ / 50) << (9 + 1)); |
| 127 | static int ip_rt_error_cost = HZ; |
| 128 | static int ip_rt_error_burst = 5 * HZ; |
| 129 | static int ip_rt_gc_elasticity = 8; |
| 130 | static int ip_rt_mtu_expires = 10 * 60 * HZ; |
| 131 | static int ip_rt_min_pmtu = 512 + 20 + 20; |
| 132 | static int ip_rt_min_advmss = 256; |
| 133 | static int ip_rt_secret_interval = 10 * 60 * HZ; |
| 134 | static unsigned long rt_deadline; |
| 135 | |
| 136 | #define RTprint(a...) printk(KERN_DEBUG a) |
| 137 | |
| 138 | static struct timer_list rt_flush_timer; |
| 139 | static struct timer_list rt_periodic_timer; |
| 140 | static struct timer_list rt_secret_timer; |
| 141 | |
| 142 | /* |
| 143 | * Interface to generic destination cache. |
| 144 | */ |
| 145 | |
| 146 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); |
| 147 | static void ipv4_dst_destroy(struct dst_entry *dst); |
| 148 | static void ipv4_dst_ifdown(struct dst_entry *dst, |
| 149 | struct net_device *dev, int how); |
| 150 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
| 151 | static void ipv4_link_failure(struct sk_buff *skb); |
| 152 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); |
| 153 | static int rt_garbage_collect(void); |
| 154 | |
| 155 | |
| 156 | static struct dst_ops ipv4_dst_ops = { |
| 157 | .family = AF_INET, |
| 158 | .protocol = __constant_htons(ETH_P_IP), |
| 159 | .gc = rt_garbage_collect, |
| 160 | .check = ipv4_dst_check, |
| 161 | .destroy = ipv4_dst_destroy, |
| 162 | .ifdown = ipv4_dst_ifdown, |
| 163 | .negative_advice = ipv4_negative_advice, |
| 164 | .link_failure = ipv4_link_failure, |
| 165 | .update_pmtu = ip_rt_update_pmtu, |
| 166 | .entry_size = sizeof(struct rtable), |
| 167 | }; |
| 168 | |
| 169 | #define ECN_OR_COST(class) TC_PRIO_##class |
| 170 | |
| 171 | __u8 ip_tos2prio[16] = { |
| 172 | TC_PRIO_BESTEFFORT, |
| 173 | ECN_OR_COST(FILLER), |
| 174 | TC_PRIO_BESTEFFORT, |
| 175 | ECN_OR_COST(BESTEFFORT), |
| 176 | TC_PRIO_BULK, |
| 177 | ECN_OR_COST(BULK), |
| 178 | TC_PRIO_BULK, |
| 179 | ECN_OR_COST(BULK), |
| 180 | TC_PRIO_INTERACTIVE, |
| 181 | ECN_OR_COST(INTERACTIVE), |
| 182 | TC_PRIO_INTERACTIVE, |
| 183 | ECN_OR_COST(INTERACTIVE), |
| 184 | TC_PRIO_INTERACTIVE_BULK, |
| 185 | ECN_OR_COST(INTERACTIVE_BULK), |
| 186 | TC_PRIO_INTERACTIVE_BULK, |
| 187 | ECN_OR_COST(INTERACTIVE_BULK) |
| 188 | }; |
| 189 | |
| 190 | |
| 191 | /* |
| 192 | * Route cache. |
| 193 | */ |
| 194 | |
| 195 | /* The locking scheme is rather straight forward: |
| 196 | * |
| 197 | * 1) Read-Copy Update protects the buckets of the central route hash. |
| 198 | * 2) Only writers remove entries, and they hold the lock |
| 199 | * as they look at rtable reference counts. |
| 200 | * 3) Only readers acquire references to rtable entries, |
| 201 | * they do so with atomic increments and with the |
| 202 | * lock held. |
| 203 | */ |
| 204 | |
| 205 | struct rt_hash_bucket { |
| 206 | struct rtable *chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 207 | }; |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 208 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
| 209 | defined(CONFIG_PROVE_LOCKING) |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 210 | /* |
| 211 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks |
| 212 | * The size of this table is a power of two and depends on the number of CPUS. |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 213 | * (on lockdep we have a quite big spinlock_t, so keep the size down there) |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 214 | */ |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 215 | #ifdef CONFIG_LOCKDEP |
| 216 | # define RT_HASH_LOCK_SZ 256 |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 217 | #else |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 218 | # if NR_CPUS >= 32 |
| 219 | # define RT_HASH_LOCK_SZ 4096 |
| 220 | # elif NR_CPUS >= 16 |
| 221 | # define RT_HASH_LOCK_SZ 2048 |
| 222 | # elif NR_CPUS >= 8 |
| 223 | # define RT_HASH_LOCK_SZ 1024 |
| 224 | # elif NR_CPUS >= 4 |
| 225 | # define RT_HASH_LOCK_SZ 512 |
| 226 | # else |
| 227 | # define RT_HASH_LOCK_SZ 256 |
| 228 | # endif |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 229 | #endif |
| 230 | |
| 231 | static spinlock_t *rt_hash_locks; |
| 232 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] |
| 233 | # define rt_hash_lock_init() { \ |
| 234 | int i; \ |
| 235 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, GFP_KERNEL); \ |
| 236 | if (!rt_hash_locks) panic("IP: failed to allocate rt_hash_locks\n"); \ |
| 237 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) \ |
| 238 | spin_lock_init(&rt_hash_locks[i]); \ |
| 239 | } |
| 240 | #else |
| 241 | # define rt_hash_lock_addr(slot) NULL |
| 242 | # define rt_hash_lock_init() |
| 243 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | static struct rt_hash_bucket *rt_hash_table; |
| 246 | static unsigned rt_hash_mask; |
| 247 | static int rt_hash_log; |
| 248 | static unsigned int rt_hash_rnd; |
| 249 | |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 250 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
Andrew Morton | dbd2915 | 2006-01-17 21:58:01 -0800 | [diff] [blame] | 251 | #define RT_CACHE_STAT_INC(field) \ |
Paul Mackerras | bfe5d83 | 2006-06-25 05:47:14 -0700 | [diff] [blame] | 252 | (__raw_get_cpu_var(rt_cache_stat).field++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | static int rt_intern_hash(unsigned hash, struct rtable *rth, |
| 255 | struct rtable **res); |
| 256 | |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 257 | static unsigned int rt_hash_code(u32 daddr, u32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | { |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 259 | return (jhash_2words(daddr, saddr, rt_hash_rnd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | & rt_hash_mask); |
| 261 | } |
| 262 | |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 263 | #define rt_hash(daddr, saddr, idx) \ |
| 264 | rt_hash_code((__force u32)(__be32)(daddr),\ |
| 265 | (__force u32)(__be32)(saddr) ^ ((idx) << 5)) |
| 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | #ifdef CONFIG_PROC_FS |
| 268 | struct rt_cache_iter_state { |
| 269 | int bucket; |
| 270 | }; |
| 271 | |
| 272 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
| 273 | { |
| 274 | struct rtable *r = NULL; |
| 275 | struct rt_cache_iter_state *st = seq->private; |
| 276 | |
| 277 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { |
| 278 | rcu_read_lock_bh(); |
| 279 | r = rt_hash_table[st->bucket].chain; |
| 280 | if (r) |
| 281 | break; |
| 282 | rcu_read_unlock_bh(); |
| 283 | } |
| 284 | return r; |
| 285 | } |
| 286 | |
| 287 | static struct rtable *rt_cache_get_next(struct seq_file *seq, struct rtable *r) |
| 288 | { |
| 289 | struct rt_cache_iter_state *st = rcu_dereference(seq->private); |
| 290 | |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 291 | r = r->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | while (!r) { |
| 293 | rcu_read_unlock_bh(); |
| 294 | if (--st->bucket < 0) |
| 295 | break; |
| 296 | rcu_read_lock_bh(); |
| 297 | r = rt_hash_table[st->bucket].chain; |
| 298 | } |
| 299 | return r; |
| 300 | } |
| 301 | |
| 302 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
| 303 | { |
| 304 | struct rtable *r = rt_cache_get_first(seq); |
| 305 | |
| 306 | if (r) |
| 307 | while (pos && (r = rt_cache_get_next(seq, r))) |
| 308 | --pos; |
| 309 | return pos ? NULL : r; |
| 310 | } |
| 311 | |
| 312 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 313 | { |
| 314 | return *pos ? rt_cache_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 315 | } |
| 316 | |
| 317 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 318 | { |
| 319 | struct rtable *r = NULL; |
| 320 | |
| 321 | if (v == SEQ_START_TOKEN) |
| 322 | r = rt_cache_get_first(seq); |
| 323 | else |
| 324 | r = rt_cache_get_next(seq, v); |
| 325 | ++*pos; |
| 326 | return r; |
| 327 | } |
| 328 | |
| 329 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 330 | { |
| 331 | if (v && v != SEQ_START_TOKEN) |
| 332 | rcu_read_unlock_bh(); |
| 333 | } |
| 334 | |
| 335 | static int rt_cache_seq_show(struct seq_file *seq, void *v) |
| 336 | { |
| 337 | if (v == SEQ_START_TOKEN) |
| 338 | seq_printf(seq, "%-127s\n", |
| 339 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" |
| 340 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" |
| 341 | "HHUptod\tSpecDst"); |
| 342 | else { |
| 343 | struct rtable *r = v; |
| 344 | char temp[256]; |
| 345 | |
| 346 | sprintf(temp, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" |
| 347 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X", |
| 348 | r->u.dst.dev ? r->u.dst.dev->name : "*", |
| 349 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, |
| 350 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), |
| 351 | r->u.dst.__use, 0, (unsigned long)r->rt_src, |
| 352 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? |
| 353 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), |
| 354 | dst_metric(&r->u.dst, RTAX_WINDOW), |
| 355 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + |
| 356 | dst_metric(&r->u.dst, RTAX_RTTVAR)), |
| 357 | r->fl.fl4_tos, |
| 358 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, |
| 359 | r->u.dst.hh ? (r->u.dst.hh->hh_output == |
| 360 | dev_queue_xmit) : 0, |
| 361 | r->rt_spec_dst); |
| 362 | seq_printf(seq, "%-127s\n", temp); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 363 | } |
| 364 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | static struct seq_operations rt_cache_seq_ops = { |
| 368 | .start = rt_cache_seq_start, |
| 369 | .next = rt_cache_seq_next, |
| 370 | .stop = rt_cache_seq_stop, |
| 371 | .show = rt_cache_seq_show, |
| 372 | }; |
| 373 | |
| 374 | static int rt_cache_seq_open(struct inode *inode, struct file *file) |
| 375 | { |
| 376 | struct seq_file *seq; |
| 377 | int rc = -ENOMEM; |
| 378 | struct rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 379 | |
| 380 | if (!s) |
| 381 | goto out; |
| 382 | rc = seq_open(file, &rt_cache_seq_ops); |
| 383 | if (rc) |
| 384 | goto out_kfree; |
| 385 | seq = file->private_data; |
| 386 | seq->private = s; |
| 387 | memset(s, 0, sizeof(*s)); |
| 388 | out: |
| 389 | return rc; |
| 390 | out_kfree: |
| 391 | kfree(s); |
| 392 | goto out; |
| 393 | } |
| 394 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 395 | static const struct file_operations rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | .owner = THIS_MODULE, |
| 397 | .open = rt_cache_seq_open, |
| 398 | .read = seq_read, |
| 399 | .llseek = seq_lseek, |
| 400 | .release = seq_release_private, |
| 401 | }; |
| 402 | |
| 403 | |
| 404 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 405 | { |
| 406 | int cpu; |
| 407 | |
| 408 | if (*pos == 0) |
| 409 | return SEQ_START_TOKEN; |
| 410 | |
| 411 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { |
| 412 | if (!cpu_possible(cpu)) |
| 413 | continue; |
| 414 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 415 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | return NULL; |
| 418 | } |
| 419 | |
| 420 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 421 | { |
| 422 | int cpu; |
| 423 | |
| 424 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { |
| 425 | if (!cpu_possible(cpu)) |
| 426 | continue; |
| 427 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 428 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
| 430 | return NULL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) |
| 435 | { |
| 436 | |
| 437 | } |
| 438 | |
| 439 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) |
| 440 | { |
| 441 | struct rt_cache_stat *st = v; |
| 442 | |
| 443 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 444 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | return 0; |
| 446 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
| 449 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", |
| 450 | atomic_read(&ipv4_dst_ops.entries), |
| 451 | st->in_hit, |
| 452 | st->in_slow_tot, |
| 453 | st->in_slow_mc, |
| 454 | st->in_no_route, |
| 455 | st->in_brd, |
| 456 | st->in_martian_dst, |
| 457 | st->in_martian_src, |
| 458 | |
| 459 | st->out_hit, |
| 460 | st->out_slow_tot, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 461 | st->out_slow_mc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 463 | st->gc_total, |
| 464 | st->gc_ignored, |
| 465 | st->gc_goal_miss, |
| 466 | st->gc_dst_overflow, |
| 467 | st->in_hlist_search, |
| 468 | st->out_hlist_search |
| 469 | ); |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static struct seq_operations rt_cpu_seq_ops = { |
| 474 | .start = rt_cpu_seq_start, |
| 475 | .next = rt_cpu_seq_next, |
| 476 | .stop = rt_cpu_seq_stop, |
| 477 | .show = rt_cpu_seq_show, |
| 478 | }; |
| 479 | |
| 480 | |
| 481 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) |
| 482 | { |
| 483 | return seq_open(file, &rt_cpu_seq_ops); |
| 484 | } |
| 485 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 486 | static const struct file_operations rt_cpu_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | .owner = THIS_MODULE, |
| 488 | .open = rt_cpu_seq_open, |
| 489 | .read = seq_read, |
| 490 | .llseek = seq_lseek, |
| 491 | .release = seq_release, |
| 492 | }; |
| 493 | |
| 494 | #endif /* CONFIG_PROC_FS */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | static __inline__ void rt_free(struct rtable *rt) |
| 497 | { |
| 498 | multipath_remove(rt); |
| 499 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 500 | } |
| 501 | |
| 502 | static __inline__ void rt_drop(struct rtable *rt) |
| 503 | { |
| 504 | multipath_remove(rt); |
| 505 | ip_rt_put(rt); |
| 506 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 507 | } |
| 508 | |
| 509 | static __inline__ int rt_fast_clean(struct rtable *rth) |
| 510 | { |
| 511 | /* Kill broadcast/multicast entries very aggresively, if they |
| 512 | collide in hash table with more useful entries */ |
| 513 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 514 | rth->fl.iif && rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | static __inline__ int rt_valuable(struct rtable *rth) |
| 518 | { |
| 519 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || |
| 520 | rth->u.dst.expires; |
| 521 | } |
| 522 | |
| 523 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) |
| 524 | { |
| 525 | unsigned long age; |
| 526 | int ret = 0; |
| 527 | |
| 528 | if (atomic_read(&rth->u.dst.__refcnt)) |
| 529 | goto out; |
| 530 | |
| 531 | ret = 1; |
| 532 | if (rth->u.dst.expires && |
| 533 | time_after_eq(jiffies, rth->u.dst.expires)) |
| 534 | goto out; |
| 535 | |
| 536 | age = jiffies - rth->u.dst.lastuse; |
| 537 | ret = 0; |
| 538 | if ((age <= tmo1 && !rt_fast_clean(rth)) || |
| 539 | (age <= tmo2 && rt_valuable(rth))) |
| 540 | goto out; |
| 541 | ret = 1; |
| 542 | out: return ret; |
| 543 | } |
| 544 | |
| 545 | /* Bits of score are: |
| 546 | * 31: very valuable |
| 547 | * 30: not quite useless |
| 548 | * 29..0: usage counter |
| 549 | */ |
| 550 | static inline u32 rt_score(struct rtable *rt) |
| 551 | { |
| 552 | u32 score = jiffies - rt->u.dst.lastuse; |
| 553 | |
| 554 | score = ~score & ~(3<<30); |
| 555 | |
| 556 | if (rt_valuable(rt)) |
| 557 | score |= (1<<31); |
| 558 | |
| 559 | if (!rt->fl.iif || |
| 560 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) |
| 561 | score |= (1<<30); |
| 562 | |
| 563 | return score; |
| 564 | } |
| 565 | |
| 566 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
| 567 | { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 568 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
| 569 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 570 | (fl1->mark ^ fl2->mark) | |
David S. Miller | 8238b21 | 2006-10-12 00:49:15 -0700 | [diff] [blame] | 571 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
| 572 | *(u16 *)&fl2->nl_u.ip4_u.tos) | |
| 573 | (fl1->oif ^ fl2->oif) | |
| 574 | (fl1->iif ^ fl2->iif)) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
| 578 | static struct rtable **rt_remove_balanced_route(struct rtable **chain_head, |
| 579 | struct rtable *expentry, |
| 580 | int *removed_count) |
| 581 | { |
| 582 | int passedexpired = 0; |
| 583 | struct rtable **nextstep = NULL; |
| 584 | struct rtable **rthp = chain_head; |
| 585 | struct rtable *rth; |
| 586 | |
| 587 | if (removed_count) |
| 588 | *removed_count = 0; |
| 589 | |
| 590 | while ((rth = *rthp) != NULL) { |
| 591 | if (rth == expentry) |
| 592 | passedexpired = 1; |
| 593 | |
| 594 | if (((*rthp)->u.dst.flags & DST_BALANCED) != 0 && |
| 595 | compare_keys(&(*rthp)->fl, &expentry->fl)) { |
| 596 | if (*rthp == expentry) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 597 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | continue; |
| 599 | } else { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 600 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | rt_free(rth); |
| 602 | if (removed_count) |
| 603 | ++(*removed_count); |
| 604 | } |
| 605 | } else { |
| 606 | if (!((*rthp)->u.dst.flags & DST_BALANCED) && |
| 607 | passedexpired && !nextstep) |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 608 | nextstep = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 610 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } |
| 612 | } |
| 613 | |
| 614 | rt_free(expentry); |
| 615 | if (removed_count) |
| 616 | ++(*removed_count); |
| 617 | |
| 618 | return nextstep; |
| 619 | } |
| 620 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
| 621 | |
| 622 | |
| 623 | /* This runs via a timer and thus is always in BH context. */ |
| 624 | static void rt_check_expire(unsigned long dummy) |
| 625 | { |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 626 | static unsigned int rover; |
| 627 | unsigned int i = rover, goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | struct rtable *rth, **rthp; |
| 629 | unsigned long now = jiffies; |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 630 | u64 mult; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 632 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; |
| 633 | if (ip_rt_gc_timeout > 1) |
| 634 | do_div(mult, ip_rt_gc_timeout); |
| 635 | goal = (unsigned int)mult; |
| 636 | if (goal > rt_hash_mask) goal = rt_hash_mask + 1; |
| 637 | for (; goal > 0; goal--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | unsigned long tmo = ip_rt_gc_timeout; |
| 639 | |
| 640 | i = (i + 1) & rt_hash_mask; |
| 641 | rthp = &rt_hash_table[i].chain; |
| 642 | |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 643 | if (*rthp == 0) |
| 644 | continue; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 645 | spin_lock(rt_hash_lock_addr(i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | while ((rth = *rthp) != NULL) { |
| 647 | if (rth->u.dst.expires) { |
| 648 | /* Entry is expired even if it is in use */ |
| 649 | if (time_before_eq(now, rth->u.dst.expires)) { |
| 650 | tmo >>= 1; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 651 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | continue; |
| 653 | } |
| 654 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { |
| 655 | tmo >>= 1; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 656 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | continue; |
| 658 | } |
| 659 | |
| 660 | /* Cleanup aged off entries. */ |
| 661 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
| 662 | /* remove all related balanced entries if necessary */ |
| 663 | if (rth->u.dst.flags & DST_BALANCED) { |
| 664 | rthp = rt_remove_balanced_route( |
| 665 | &rt_hash_table[i].chain, |
| 666 | rth, NULL); |
| 667 | if (!rthp) |
| 668 | break; |
| 669 | } else { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 670 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | rt_free(rth); |
| 672 | } |
| 673 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 674 | *rthp = rth->u.dst.rt_next; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 675 | rt_free(rth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
| 677 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 678 | spin_unlock(rt_hash_lock_addr(i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | /* Fallback loop breaker. */ |
| 681 | if (time_after(jiffies, now)) |
| 682 | break; |
| 683 | } |
| 684 | rover = i; |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 685 | mod_timer(&rt_periodic_timer, jiffies + ip_rt_gc_interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | } |
| 687 | |
| 688 | /* This can run from both BH and non-BH contexts, the latter |
| 689 | * in the case of a forced flush event. |
| 690 | */ |
| 691 | static void rt_run_flush(unsigned long dummy) |
| 692 | { |
| 693 | int i; |
| 694 | struct rtable *rth, *next; |
| 695 | |
| 696 | rt_deadline = 0; |
| 697 | |
| 698 | get_random_bytes(&rt_hash_rnd, 4); |
| 699 | |
| 700 | for (i = rt_hash_mask; i >= 0; i--) { |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 701 | spin_lock_bh(rt_hash_lock_addr(i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | rth = rt_hash_table[i].chain; |
| 703 | if (rth) |
| 704 | rt_hash_table[i].chain = NULL; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 705 | spin_unlock_bh(rt_hash_lock_addr(i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | for (; rth; rth = next) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 708 | next = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | rt_free(rth); |
| 710 | } |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | static DEFINE_SPINLOCK(rt_flush_lock); |
| 715 | |
| 716 | void rt_cache_flush(int delay) |
| 717 | { |
| 718 | unsigned long now = jiffies; |
| 719 | int user_mode = !in_softirq(); |
| 720 | |
| 721 | if (delay < 0) |
| 722 | delay = ip_rt_min_delay; |
| 723 | |
| 724 | /* flush existing multipath state*/ |
| 725 | multipath_flush(); |
| 726 | |
| 727 | spin_lock_bh(&rt_flush_lock); |
| 728 | |
| 729 | if (del_timer(&rt_flush_timer) && delay > 0 && rt_deadline) { |
| 730 | long tmo = (long)(rt_deadline - now); |
| 731 | |
| 732 | /* If flush timer is already running |
| 733 | and flush request is not immediate (delay > 0): |
| 734 | |
| 735 | if deadline is not achieved, prolongate timer to "delay", |
| 736 | otherwise fire it at deadline time. |
| 737 | */ |
| 738 | |
| 739 | if (user_mode && tmo < ip_rt_max_delay-ip_rt_min_delay) |
| 740 | tmo = 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | if (delay > tmo) |
| 743 | delay = tmo; |
| 744 | } |
| 745 | |
| 746 | if (delay <= 0) { |
| 747 | spin_unlock_bh(&rt_flush_lock); |
| 748 | rt_run_flush(0); |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | if (rt_deadline == 0) |
| 753 | rt_deadline = now + ip_rt_max_delay; |
| 754 | |
| 755 | mod_timer(&rt_flush_timer, now+delay); |
| 756 | spin_unlock_bh(&rt_flush_lock); |
| 757 | } |
| 758 | |
| 759 | static void rt_secret_rebuild(unsigned long dummy) |
| 760 | { |
| 761 | unsigned long now = jiffies; |
| 762 | |
| 763 | rt_cache_flush(0); |
| 764 | mod_timer(&rt_secret_timer, now + ip_rt_secret_interval); |
| 765 | } |
| 766 | |
| 767 | /* |
| 768 | Short description of GC goals. |
| 769 | |
| 770 | We want to build algorithm, which will keep routing cache |
| 771 | at some equilibrium point, when number of aged off entries |
| 772 | is kept approximately equal to newly generated ones. |
| 773 | |
| 774 | Current expiration strength is variable "expire". |
| 775 | We try to adjust it dynamically, so that if networking |
| 776 | is idle expires is large enough to keep enough of warm entries, |
| 777 | and when load increases it reduces to limit cache size. |
| 778 | */ |
| 779 | |
| 780 | static int rt_garbage_collect(void) |
| 781 | { |
| 782 | static unsigned long expire = RT_GC_TIMEOUT; |
| 783 | static unsigned long last_gc; |
| 784 | static int rover; |
| 785 | static int equilibrium; |
| 786 | struct rtable *rth, **rthp; |
| 787 | unsigned long now = jiffies; |
| 788 | int goal; |
| 789 | |
| 790 | /* |
| 791 | * Garbage collection is pretty expensive, |
| 792 | * do not make it too frequently. |
| 793 | */ |
| 794 | |
| 795 | RT_CACHE_STAT_INC(gc_total); |
| 796 | |
| 797 | if (now - last_gc < ip_rt_gc_min_interval && |
| 798 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { |
| 799 | RT_CACHE_STAT_INC(gc_ignored); |
| 800 | goto out; |
| 801 | } |
| 802 | |
| 803 | /* Calculate number of entries, which we want to expire now. */ |
| 804 | goal = atomic_read(&ipv4_dst_ops.entries) - |
| 805 | (ip_rt_gc_elasticity << rt_hash_log); |
| 806 | if (goal <= 0) { |
| 807 | if (equilibrium < ipv4_dst_ops.gc_thresh) |
| 808 | equilibrium = ipv4_dst_ops.gc_thresh; |
| 809 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
| 810 | if (goal > 0) { |
| 811 | equilibrium += min_t(unsigned int, goal / 2, rt_hash_mask + 1); |
| 812 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
| 813 | } |
| 814 | } else { |
| 815 | /* We are in dangerous area. Try to reduce cache really |
| 816 | * aggressively. |
| 817 | */ |
| 818 | goal = max_t(unsigned int, goal / 2, rt_hash_mask + 1); |
| 819 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
| 820 | } |
| 821 | |
| 822 | if (now - last_gc >= ip_rt_gc_min_interval) |
| 823 | last_gc = now; |
| 824 | |
| 825 | if (goal <= 0) { |
| 826 | equilibrium += goal; |
| 827 | goto work_done; |
| 828 | } |
| 829 | |
| 830 | do { |
| 831 | int i, k; |
| 832 | |
| 833 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { |
| 834 | unsigned long tmo = expire; |
| 835 | |
| 836 | k = (k + 1) & rt_hash_mask; |
| 837 | rthp = &rt_hash_table[k].chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 838 | spin_lock_bh(rt_hash_lock_addr(k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | while ((rth = *rthp) != NULL) { |
| 840 | if (!rt_may_expire(rth, tmo, expire)) { |
| 841 | tmo >>= 1; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 842 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | continue; |
| 844 | } |
| 845 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
| 846 | /* remove all related balanced entries |
| 847 | * if necessary |
| 848 | */ |
| 849 | if (rth->u.dst.flags & DST_BALANCED) { |
| 850 | int r; |
| 851 | |
| 852 | rthp = rt_remove_balanced_route( |
Suresh Bhogavilli | 8525987 | 2006-02-21 13:42:22 -0800 | [diff] [blame] | 853 | &rt_hash_table[k].chain, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | rth, |
| 855 | &r); |
| 856 | goal -= r; |
| 857 | if (!rthp) |
| 858 | break; |
| 859 | } else { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 860 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | rt_free(rth); |
| 862 | goal--; |
| 863 | } |
| 864 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 865 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | rt_free(rth); |
| 867 | goal--; |
| 868 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
| 869 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 870 | spin_unlock_bh(rt_hash_lock_addr(k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | if (goal <= 0) |
| 872 | break; |
| 873 | } |
| 874 | rover = k; |
| 875 | |
| 876 | if (goal <= 0) |
| 877 | goto work_done; |
| 878 | |
| 879 | /* Goal is not achieved. We stop process if: |
| 880 | |
| 881 | - if expire reduced to zero. Otherwise, expire is halfed. |
| 882 | - if table is not full. |
| 883 | - if we are called from interrupt. |
| 884 | - jiffies check is just fallback/debug loop breaker. |
| 885 | We will not spin here for long time in any case. |
| 886 | */ |
| 887 | |
| 888 | RT_CACHE_STAT_INC(gc_goal_miss); |
| 889 | |
| 890 | if (expire == 0) |
| 891 | break; |
| 892 | |
| 893 | expire >>= 1; |
| 894 | #if RT_CACHE_DEBUG >= 2 |
| 895 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, |
| 896 | atomic_read(&ipv4_dst_ops.entries), goal, i); |
| 897 | #endif |
| 898 | |
| 899 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) |
| 900 | goto out; |
| 901 | } while (!in_softirq() && time_before_eq(jiffies, now)); |
| 902 | |
| 903 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) |
| 904 | goto out; |
| 905 | if (net_ratelimit()) |
| 906 | printk(KERN_WARNING "dst cache overflow\n"); |
| 907 | RT_CACHE_STAT_INC(gc_dst_overflow); |
| 908 | return 1; |
| 909 | |
| 910 | work_done: |
| 911 | expire += ip_rt_gc_min_interval; |
| 912 | if (expire > ip_rt_gc_timeout || |
| 913 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) |
| 914 | expire = ip_rt_gc_timeout; |
| 915 | #if RT_CACHE_DEBUG >= 2 |
| 916 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, |
| 917 | atomic_read(&ipv4_dst_ops.entries), goal, rover); |
| 918 | #endif |
| 919 | out: return 0; |
| 920 | } |
| 921 | |
| 922 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) |
| 923 | { |
| 924 | struct rtable *rth, **rthp; |
| 925 | unsigned long now; |
| 926 | struct rtable *cand, **candp; |
| 927 | u32 min_score; |
| 928 | int chain_length; |
| 929 | int attempts = !in_softirq(); |
| 930 | |
| 931 | restart: |
| 932 | chain_length = 0; |
| 933 | min_score = ~(u32)0; |
| 934 | cand = NULL; |
| 935 | candp = NULL; |
| 936 | now = jiffies; |
| 937 | |
| 938 | rthp = &rt_hash_table[hash].chain; |
| 939 | |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 940 | spin_lock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | while ((rth = *rthp) != NULL) { |
| 942 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
| 943 | if (!(rth->u.dst.flags & DST_BALANCED) && |
| 944 | compare_keys(&rth->fl, &rt->fl)) { |
| 945 | #else |
| 946 | if (compare_keys(&rth->fl, &rt->fl)) { |
| 947 | #endif |
| 948 | /* Put it first */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 949 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | /* |
| 951 | * Since lookup is lockfree, the deletion |
| 952 | * must be visible to another weakly ordered CPU before |
| 953 | * the insertion at the start of the hash chain. |
| 954 | */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 955 | rcu_assign_pointer(rth->u.dst.rt_next, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | rt_hash_table[hash].chain); |
| 957 | /* |
| 958 | * Since lookup is lockfree, the update writes |
| 959 | * must be ordered for consistency on SMP. |
| 960 | */ |
| 961 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); |
| 962 | |
| 963 | rth->u.dst.__use++; |
| 964 | dst_hold(&rth->u.dst); |
| 965 | rth->u.dst.lastuse = now; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 966 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
| 968 | rt_drop(rt); |
| 969 | *rp = rth; |
| 970 | return 0; |
| 971 | } |
| 972 | |
| 973 | if (!atomic_read(&rth->u.dst.__refcnt)) { |
| 974 | u32 score = rt_score(rth); |
| 975 | |
| 976 | if (score <= min_score) { |
| 977 | cand = rth; |
| 978 | candp = rthp; |
| 979 | min_score = score; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | chain_length++; |
| 984 | |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 985 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | } |
| 987 | |
| 988 | if (cand) { |
| 989 | /* ip_rt_gc_elasticity used to be average length of chain |
| 990 | * length, when exceeded gc becomes really aggressive. |
| 991 | * |
| 992 | * The second limit is less certain. At the moment it allows |
| 993 | * only 2 entries per bucket. We will see. |
| 994 | */ |
| 995 | if (chain_length > ip_rt_gc_elasticity) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 996 | *candp = cand->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | rt_free(cand); |
| 998 | } |
| 999 | } |
| 1000 | |
| 1001 | /* Try to bind route to arp only if it is output |
| 1002 | route or unicast forwarding path. |
| 1003 | */ |
| 1004 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { |
| 1005 | int err = arp_bind_neighbour(&rt->u.dst); |
| 1006 | if (err) { |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1007 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | |
| 1009 | if (err != -ENOBUFS) { |
| 1010 | rt_drop(rt); |
| 1011 | return err; |
| 1012 | } |
| 1013 | |
| 1014 | /* Neighbour tables are full and nothing |
| 1015 | can be released. Try to shrink route cache, |
| 1016 | it is most likely it holds some neighbour records. |
| 1017 | */ |
| 1018 | if (attempts-- > 0) { |
| 1019 | int saved_elasticity = ip_rt_gc_elasticity; |
| 1020 | int saved_int = ip_rt_gc_min_interval; |
| 1021 | ip_rt_gc_elasticity = 1; |
| 1022 | ip_rt_gc_min_interval = 0; |
| 1023 | rt_garbage_collect(); |
| 1024 | ip_rt_gc_min_interval = saved_int; |
| 1025 | ip_rt_gc_elasticity = saved_elasticity; |
| 1026 | goto restart; |
| 1027 | } |
| 1028 | |
| 1029 | if (net_ratelimit()) |
| 1030 | printk(KERN_WARNING "Neighbour table overflow.\n"); |
| 1031 | rt_drop(rt); |
| 1032 | return -ENOBUFS; |
| 1033 | } |
| 1034 | } |
| 1035 | |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1036 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | #if RT_CACHE_DEBUG >= 2 |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1038 | if (rt->u.dst.rt_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | struct rtable *trt; |
| 1040 | printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash, |
| 1041 | NIPQUAD(rt->rt_dst)); |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1042 | for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst)); |
| 1044 | printk("\n"); |
| 1045 | } |
| 1046 | #endif |
| 1047 | rt_hash_table[hash].chain = rt; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1048 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | *rp = rt; |
| 1050 | return 0; |
| 1051 | } |
| 1052 | |
| 1053 | void rt_bind_peer(struct rtable *rt, int create) |
| 1054 | { |
| 1055 | static DEFINE_SPINLOCK(rt_peer_lock); |
| 1056 | struct inet_peer *peer; |
| 1057 | |
| 1058 | peer = inet_getpeer(rt->rt_dst, create); |
| 1059 | |
| 1060 | spin_lock_bh(&rt_peer_lock); |
| 1061 | if (rt->peer == NULL) { |
| 1062 | rt->peer = peer; |
| 1063 | peer = NULL; |
| 1064 | } |
| 1065 | spin_unlock_bh(&rt_peer_lock); |
| 1066 | if (peer) |
| 1067 | inet_putpeer(peer); |
| 1068 | } |
| 1069 | |
| 1070 | /* |
| 1071 | * Peer allocation may fail only in serious out-of-memory conditions. However |
| 1072 | * we still can generate some output. |
| 1073 | * Random ID selection looks a bit dangerous because we have no chances to |
| 1074 | * select ID being unique in a reasonable period of time. |
| 1075 | * But broken packet identifier may be better than no packet at all. |
| 1076 | */ |
| 1077 | static void ip_select_fb_ident(struct iphdr *iph) |
| 1078 | { |
| 1079 | static DEFINE_SPINLOCK(ip_fb_id_lock); |
| 1080 | static u32 ip_fallback_id; |
| 1081 | u32 salt; |
| 1082 | |
| 1083 | spin_lock_bh(&ip_fb_id_lock); |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1084 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | iph->id = htons(salt & 0xFFFF); |
| 1086 | ip_fallback_id = salt; |
| 1087 | spin_unlock_bh(&ip_fb_id_lock); |
| 1088 | } |
| 1089 | |
| 1090 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) |
| 1091 | { |
| 1092 | struct rtable *rt = (struct rtable *) dst; |
| 1093 | |
| 1094 | if (rt) { |
| 1095 | if (rt->peer == NULL) |
| 1096 | rt_bind_peer(rt, 1); |
| 1097 | |
| 1098 | /* If peer is attached to destination, it is never detached, |
| 1099 | so that we need not to grab a lock to dereference it. |
| 1100 | */ |
| 1101 | if (rt->peer) { |
| 1102 | iph->id = htons(inet_getid(rt->peer, more)); |
| 1103 | return; |
| 1104 | } |
| 1105 | } else |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1106 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
Stephen Hemminger | 9c2b332 | 2005-04-19 22:39:42 -0700 | [diff] [blame] | 1107 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
| 1109 | ip_select_fb_ident(iph); |
| 1110 | } |
| 1111 | |
| 1112 | static void rt_del(unsigned hash, struct rtable *rt) |
| 1113 | { |
| 1114 | struct rtable **rthp; |
| 1115 | |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1116 | spin_lock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | ip_rt_put(rt); |
| 1118 | for (rthp = &rt_hash_table[hash].chain; *rthp; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1119 | rthp = &(*rthp)->u.dst.rt_next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | if (*rthp == rt) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1121 | *rthp = rt->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | rt_free(rt); |
| 1123 | break; |
| 1124 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1125 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | } |
| 1127 | |
Al Viro | f765522 | 2006-09-26 21:25:43 -0700 | [diff] [blame] | 1128 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
| 1129 | __be32 saddr, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | { |
| 1131 | int i, k; |
| 1132 | struct in_device *in_dev = in_dev_get(dev); |
| 1133 | struct rtable *rth, **rthp; |
Al Viro | f765522 | 2006-09-26 21:25:43 -0700 | [diff] [blame] | 1134 | __be32 skeys[2] = { saddr, 0 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | int ikeys[2] = { dev->ifindex, 0 }; |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1136 | struct netevent_redirect netevent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | if (!in_dev) |
| 1139 | return; |
| 1140 | |
| 1141 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
| 1142 | || MULTICAST(new_gw) || BADCLASS(new_gw) || ZERONET(new_gw)) |
| 1143 | goto reject_redirect; |
| 1144 | |
| 1145 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
| 1146 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) |
| 1147 | goto reject_redirect; |
| 1148 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) |
| 1149 | goto reject_redirect; |
| 1150 | } else { |
| 1151 | if (inet_addr_type(new_gw) != RTN_UNICAST) |
| 1152 | goto reject_redirect; |
| 1153 | } |
| 1154 | |
| 1155 | for (i = 0; i < 2; i++) { |
| 1156 | for (k = 0; k < 2; k++) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1157 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | |
| 1159 | rthp=&rt_hash_table[hash].chain; |
| 1160 | |
| 1161 | rcu_read_lock(); |
| 1162 | while ((rth = rcu_dereference(*rthp)) != NULL) { |
| 1163 | struct rtable *rt; |
| 1164 | |
| 1165 | if (rth->fl.fl4_dst != daddr || |
| 1166 | rth->fl.fl4_src != skeys[i] || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | rth->fl.oif != ikeys[k] || |
| 1168 | rth->fl.iif != 0) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1169 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | continue; |
| 1171 | } |
| 1172 | |
| 1173 | if (rth->rt_dst != daddr || |
| 1174 | rth->rt_src != saddr || |
| 1175 | rth->u.dst.error || |
| 1176 | rth->rt_gateway != old_gw || |
| 1177 | rth->u.dst.dev != dev) |
| 1178 | break; |
| 1179 | |
| 1180 | dst_hold(&rth->u.dst); |
| 1181 | rcu_read_unlock(); |
| 1182 | |
| 1183 | rt = dst_alloc(&ipv4_dst_ops); |
| 1184 | if (rt == NULL) { |
| 1185 | ip_rt_put(rth); |
| 1186 | in_dev_put(in_dev); |
| 1187 | return; |
| 1188 | } |
| 1189 | |
| 1190 | /* Copy all the information. */ |
| 1191 | *rt = *rth; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1192 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | rt->u.dst.__use = 1; |
| 1194 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 1195 | rt->u.dst.child = NULL; |
| 1196 | if (rt->u.dst.dev) |
| 1197 | dev_hold(rt->u.dst.dev); |
| 1198 | if (rt->idev) |
| 1199 | in_dev_hold(rt->idev); |
| 1200 | rt->u.dst.obsolete = 0; |
| 1201 | rt->u.dst.lastuse = jiffies; |
| 1202 | rt->u.dst.path = &rt->u.dst; |
| 1203 | rt->u.dst.neighbour = NULL; |
| 1204 | rt->u.dst.hh = NULL; |
| 1205 | rt->u.dst.xfrm = NULL; |
| 1206 | |
| 1207 | rt->rt_flags |= RTCF_REDIRECTED; |
| 1208 | |
| 1209 | /* Gateway is different ... */ |
| 1210 | rt->rt_gateway = new_gw; |
| 1211 | |
| 1212 | /* Redirect received -> path was valid */ |
| 1213 | dst_confirm(&rth->u.dst); |
| 1214 | |
| 1215 | if (rt->peer) |
| 1216 | atomic_inc(&rt->peer->refcnt); |
| 1217 | |
| 1218 | if (arp_bind_neighbour(&rt->u.dst) || |
| 1219 | !(rt->u.dst.neighbour->nud_state & |
| 1220 | NUD_VALID)) { |
| 1221 | if (rt->u.dst.neighbour) |
| 1222 | neigh_event_send(rt->u.dst.neighbour, NULL); |
| 1223 | ip_rt_put(rth); |
| 1224 | rt_drop(rt); |
| 1225 | goto do_next; |
| 1226 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1227 | |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1228 | netevent.old = &rth->u.dst; |
| 1229 | netevent.new = &rt->u.dst; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1230 | call_netevent_notifiers(NETEVENT_REDIRECT, |
| 1231 | &netevent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
| 1233 | rt_del(hash, rth); |
| 1234 | if (!rt_intern_hash(hash, rt, &rt)) |
| 1235 | ip_rt_put(rt); |
| 1236 | goto do_next; |
| 1237 | } |
| 1238 | rcu_read_unlock(); |
| 1239 | do_next: |
| 1240 | ; |
| 1241 | } |
| 1242 | } |
| 1243 | in_dev_put(in_dev); |
| 1244 | return; |
| 1245 | |
| 1246 | reject_redirect: |
| 1247 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1248 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) |
| 1249 | printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about " |
| 1250 | "%u.%u.%u.%u ignored.\n" |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 1251 | " Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 1253 | NIPQUAD(saddr), NIPQUAD(daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | #endif |
| 1255 | in_dev_put(in_dev); |
| 1256 | } |
| 1257 | |
| 1258 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
| 1259 | { |
| 1260 | struct rtable *rt = (struct rtable*)dst; |
| 1261 | struct dst_entry *ret = dst; |
| 1262 | |
| 1263 | if (rt) { |
| 1264 | if (dst->obsolete) { |
| 1265 | ip_rt_put(rt); |
| 1266 | ret = NULL; |
| 1267 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
| 1268 | rt->u.dst.expires) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1269 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
| 1270 | rt->fl.oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | #if RT_CACHE_DEBUG >= 1 |
| 1272 | printk(KERN_DEBUG "ip_rt_advice: redirect to " |
| 1273 | "%u.%u.%u.%u/%02x dropped\n", |
| 1274 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); |
| 1275 | #endif |
| 1276 | rt_del(hash, rt); |
| 1277 | ret = NULL; |
| 1278 | } |
| 1279 | } |
| 1280 | return ret; |
| 1281 | } |
| 1282 | |
| 1283 | /* |
| 1284 | * Algorithm: |
| 1285 | * 1. The first ip_rt_redirect_number redirects are sent |
| 1286 | * with exponential backoff, then we stop sending them at all, |
| 1287 | * assuming that the host ignores our redirects. |
| 1288 | * 2. If we did not see packets requiring redirects |
| 1289 | * during ip_rt_redirect_silence, we assume that the host |
| 1290 | * forgot redirected route and start to send redirects again. |
| 1291 | * |
| 1292 | * This algorithm is much cheaper and more intelligent than dumb load limiting |
| 1293 | * in icmp.c. |
| 1294 | * |
| 1295 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) |
| 1296 | * and "frag. need" (breaks PMTU discovery) in icmp.c. |
| 1297 | */ |
| 1298 | |
| 1299 | void ip_rt_send_redirect(struct sk_buff *skb) |
| 1300 | { |
| 1301 | struct rtable *rt = (struct rtable*)skb->dst; |
| 1302 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
| 1303 | |
| 1304 | if (!in_dev) |
| 1305 | return; |
| 1306 | |
| 1307 | if (!IN_DEV_TX_REDIRECTS(in_dev)) |
| 1308 | goto out; |
| 1309 | |
| 1310 | /* No redirected packets during ip_rt_redirect_silence; |
| 1311 | * reset the algorithm. |
| 1312 | */ |
| 1313 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) |
| 1314 | rt->u.dst.rate_tokens = 0; |
| 1315 | |
| 1316 | /* Too many ignored redirects; do not send anything |
| 1317 | * set u.dst.rate_last to the last seen redirected packet. |
| 1318 | */ |
| 1319 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { |
| 1320 | rt->u.dst.rate_last = jiffies; |
| 1321 | goto out; |
| 1322 | } |
| 1323 | |
| 1324 | /* Check for load limit; set rate_last to the latest sent |
| 1325 | * redirect. |
| 1326 | */ |
Li Yewang | 14fb8a7 | 2006-12-18 00:26:35 -0800 | [diff] [blame] | 1327 | if (rt->u.dst.rate_tokens == 0 || |
| 1328 | time_after(jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | (rt->u.dst.rate_last + |
| 1330 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { |
| 1331 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
| 1332 | rt->u.dst.rate_last = jiffies; |
| 1333 | ++rt->u.dst.rate_tokens; |
| 1334 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1335 | if (IN_DEV_LOG_MARTIANS(in_dev) && |
| 1336 | rt->u.dst.rate_tokens == ip_rt_redirect_number && |
| 1337 | net_ratelimit()) |
| 1338 | printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores " |
| 1339 | "redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n", |
| 1340 | NIPQUAD(rt->rt_src), rt->rt_iif, |
| 1341 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); |
| 1342 | #endif |
| 1343 | } |
| 1344 | out: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1345 | in_dev_put(in_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
| 1348 | static int ip_error(struct sk_buff *skb) |
| 1349 | { |
| 1350 | struct rtable *rt = (struct rtable*)skb->dst; |
| 1351 | unsigned long now; |
| 1352 | int code; |
| 1353 | |
| 1354 | switch (rt->u.dst.error) { |
| 1355 | case EINVAL: |
| 1356 | default: |
| 1357 | goto out; |
| 1358 | case EHOSTUNREACH: |
| 1359 | code = ICMP_HOST_UNREACH; |
| 1360 | break; |
| 1361 | case ENETUNREACH: |
| 1362 | code = ICMP_NET_UNREACH; |
| 1363 | break; |
| 1364 | case EACCES: |
| 1365 | code = ICMP_PKT_FILTERED; |
| 1366 | break; |
| 1367 | } |
| 1368 | |
| 1369 | now = jiffies; |
| 1370 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; |
| 1371 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) |
| 1372 | rt->u.dst.rate_tokens = ip_rt_error_burst; |
| 1373 | rt->u.dst.rate_last = now; |
| 1374 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { |
| 1375 | rt->u.dst.rate_tokens -= ip_rt_error_cost; |
| 1376 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); |
| 1377 | } |
| 1378 | |
| 1379 | out: kfree_skb(skb); |
| 1380 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1381 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
| 1383 | /* |
| 1384 | * The last two values are not from the RFC but |
| 1385 | * are needed for AMPRnet AX.25 paths. |
| 1386 | */ |
| 1387 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1388 | static const unsigned short mtu_plateau[] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
| 1390 | |
| 1391 | static __inline__ unsigned short guess_mtu(unsigned short old_mtu) |
| 1392 | { |
| 1393 | int i; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
| 1396 | if (old_mtu > mtu_plateau[i]) |
| 1397 | return mtu_plateau[i]; |
| 1398 | return 68; |
| 1399 | } |
| 1400 | |
| 1401 | unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu) |
| 1402 | { |
| 1403 | int i; |
| 1404 | unsigned short old_mtu = ntohs(iph->tot_len); |
| 1405 | struct rtable *rth; |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1406 | __be32 skeys[2] = { iph->saddr, 0, }; |
| 1407 | __be32 daddr = iph->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | unsigned short est_mtu = 0; |
| 1409 | |
| 1410 | if (ipv4_config.no_pmtu_disc) |
| 1411 | return 0; |
| 1412 | |
| 1413 | for (i = 0; i < 2; i++) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1414 | unsigned hash = rt_hash(daddr, skeys[i], 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | rcu_read_lock(); |
| 1417 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1418 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | if (rth->fl.fl4_dst == daddr && |
| 1420 | rth->fl.fl4_src == skeys[i] && |
| 1421 | rth->rt_dst == daddr && |
| 1422 | rth->rt_src == iph->saddr && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | rth->fl.iif == 0 && |
| 1424 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU))) { |
| 1425 | unsigned short mtu = new_mtu; |
| 1426 | |
| 1427 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
| 1428 | |
| 1429 | /* BSD 4.2 compatibility hack :-( */ |
| 1430 | if (mtu == 0 && |
| 1431 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && |
| 1432 | old_mtu >= 68 + (iph->ihl << 2)) |
| 1433 | old_mtu -= iph->ihl << 2; |
| 1434 | |
| 1435 | mtu = guess_mtu(old_mtu); |
| 1436 | } |
| 1437 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1438 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | dst_confirm(&rth->u.dst); |
| 1440 | if (mtu < ip_rt_min_pmtu) { |
| 1441 | mtu = ip_rt_min_pmtu; |
| 1442 | rth->u.dst.metrics[RTAX_LOCK-1] |= |
| 1443 | (1 << RTAX_MTU); |
| 1444 | } |
| 1445 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; |
| 1446 | dst_set_expires(&rth->u.dst, |
| 1447 | ip_rt_mtu_expires); |
| 1448 | } |
| 1449 | est_mtu = mtu; |
| 1450 | } |
| 1451 | } |
| 1452 | } |
| 1453 | rcu_read_unlock(); |
| 1454 | } |
| 1455 | return est_mtu ? : new_mtu; |
| 1456 | } |
| 1457 | |
| 1458 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 1459 | { |
| 1460 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && |
| 1461 | !(dst_metric_locked(dst, RTAX_MTU))) { |
| 1462 | if (mtu < ip_rt_min_pmtu) { |
| 1463 | mtu = ip_rt_min_pmtu; |
| 1464 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); |
| 1465 | } |
| 1466 | dst->metrics[RTAX_MTU-1] = mtu; |
| 1467 | dst_set_expires(dst, ip_rt_mtu_expires); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1468 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | } |
| 1470 | } |
| 1471 | |
| 1472 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
| 1473 | { |
| 1474 | return NULL; |
| 1475 | } |
| 1476 | |
| 1477 | static void ipv4_dst_destroy(struct dst_entry *dst) |
| 1478 | { |
| 1479 | struct rtable *rt = (struct rtable *) dst; |
| 1480 | struct inet_peer *peer = rt->peer; |
| 1481 | struct in_device *idev = rt->idev; |
| 1482 | |
| 1483 | if (peer) { |
| 1484 | rt->peer = NULL; |
| 1485 | inet_putpeer(peer); |
| 1486 | } |
| 1487 | |
| 1488 | if (idev) { |
| 1489 | rt->idev = NULL; |
| 1490 | in_dev_put(idev); |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 1495 | int how) |
| 1496 | { |
| 1497 | struct rtable *rt = (struct rtable *) dst; |
| 1498 | struct in_device *idev = rt->idev; |
| 1499 | if (dev != &loopback_dev && idev && idev->dev == dev) { |
| 1500 | struct in_device *loopback_idev = in_dev_get(&loopback_dev); |
| 1501 | if (loopback_idev) { |
| 1502 | rt->idev = loopback_idev; |
| 1503 | in_dev_put(idev); |
| 1504 | } |
| 1505 | } |
| 1506 | } |
| 1507 | |
| 1508 | static void ipv4_link_failure(struct sk_buff *skb) |
| 1509 | { |
| 1510 | struct rtable *rt; |
| 1511 | |
| 1512 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| 1513 | |
| 1514 | rt = (struct rtable *) skb->dst; |
| 1515 | if (rt) |
| 1516 | dst_set_expires(&rt->u.dst, 0); |
| 1517 | } |
| 1518 | |
| 1519 | static int ip_rt_bug(struct sk_buff *skb) |
| 1520 | { |
| 1521 | printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n", |
| 1522 | NIPQUAD(skb->nh.iph->saddr), NIPQUAD(skb->nh.iph->daddr), |
| 1523 | skb->dev ? skb->dev->name : "?"); |
| 1524 | kfree_skb(skb); |
| 1525 | return 0; |
| 1526 | } |
| 1527 | |
| 1528 | /* |
| 1529 | We do not cache source address of outgoing interface, |
| 1530 | because it is used only by IP RR, TS and SRR options, |
| 1531 | so that it out of fast path. |
| 1532 | |
| 1533 | BTW remember: "addr" is allowed to be not aligned |
| 1534 | in IP options! |
| 1535 | */ |
| 1536 | |
| 1537 | void ip_rt_get_source(u8 *addr, struct rtable *rt) |
| 1538 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1539 | __be32 src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | struct fib_result res; |
| 1541 | |
| 1542 | if (rt->fl.iif == 0) |
| 1543 | src = rt->rt_src; |
| 1544 | else if (fib_lookup(&rt->fl, &res) == 0) { |
| 1545 | src = FIB_RES_PREFSRC(res); |
| 1546 | fib_res_put(&res); |
| 1547 | } else |
| 1548 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, |
| 1549 | RT_SCOPE_UNIVERSE); |
| 1550 | memcpy(addr, &src, 4); |
| 1551 | } |
| 1552 | |
| 1553 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1554 | static void set_class_tag(struct rtable *rt, u32 tag) |
| 1555 | { |
| 1556 | if (!(rt->u.dst.tclassid & 0xFFFF)) |
| 1557 | rt->u.dst.tclassid |= tag & 0xFFFF; |
| 1558 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) |
| 1559 | rt->u.dst.tclassid |= tag & 0xFFFF0000; |
| 1560 | } |
| 1561 | #endif |
| 1562 | |
| 1563 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) |
| 1564 | { |
| 1565 | struct fib_info *fi = res->fi; |
| 1566 | |
| 1567 | if (fi) { |
| 1568 | if (FIB_RES_GW(*res) && |
| 1569 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
| 1570 | rt->rt_gateway = FIB_RES_GW(*res); |
| 1571 | memcpy(rt->u.dst.metrics, fi->fib_metrics, |
| 1572 | sizeof(rt->u.dst.metrics)); |
| 1573 | if (fi->fib_mtu == 0) { |
| 1574 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; |
| 1575 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && |
| 1576 | rt->rt_gateway != rt->rt_dst && |
| 1577 | rt->u.dst.dev->mtu > 576) |
| 1578 | rt->u.dst.metrics[RTAX_MTU-1] = 576; |
| 1579 | } |
| 1580 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1581 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; |
| 1582 | #endif |
| 1583 | } else |
| 1584 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; |
| 1585 | |
| 1586 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) |
| 1587 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; |
| 1588 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) |
| 1589 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; |
| 1590 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) |
| 1591 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, |
| 1592 | ip_rt_min_advmss); |
| 1593 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) |
| 1594 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; |
| 1595 | |
| 1596 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1597 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 1598 | set_class_tag(rt, fib_rules_tclass(res)); |
| 1599 | #endif |
| 1600 | set_class_tag(rt, itag); |
| 1601 | #endif |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1602 | rt->rt_type = res->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | } |
| 1604 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1605 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | u8 tos, struct net_device *dev, int our) |
| 1607 | { |
| 1608 | unsigned hash; |
| 1609 | struct rtable *rth; |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1610 | __be32 spec_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | struct in_device *in_dev = in_dev_get(dev); |
| 1612 | u32 itag = 0; |
| 1613 | |
| 1614 | /* Primary sanity checks. */ |
| 1615 | |
| 1616 | if (in_dev == NULL) |
| 1617 | return -EINVAL; |
| 1618 | |
| 1619 | if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr) || |
| 1620 | skb->protocol != htons(ETH_P_IP)) |
| 1621 | goto e_inval; |
| 1622 | |
| 1623 | if (ZERONET(saddr)) { |
| 1624 | if (!LOCAL_MCAST(daddr)) |
| 1625 | goto e_inval; |
| 1626 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
| 1627 | } else if (fib_validate_source(saddr, 0, tos, 0, |
| 1628 | dev, &spec_dst, &itag) < 0) |
| 1629 | goto e_inval; |
| 1630 | |
| 1631 | rth = dst_alloc(&ipv4_dst_ops); |
| 1632 | if (!rth) |
| 1633 | goto e_nobufs; |
| 1634 | |
| 1635 | rth->u.dst.output= ip_rt_bug; |
| 1636 | |
| 1637 | atomic_set(&rth->u.dst.__refcnt, 1); |
| 1638 | rth->u.dst.flags= DST_HOST; |
| 1639 | if (in_dev->cnf.no_policy) |
| 1640 | rth->u.dst.flags |= DST_NOPOLICY; |
| 1641 | rth->fl.fl4_dst = daddr; |
| 1642 | rth->rt_dst = daddr; |
| 1643 | rth->fl.fl4_tos = tos; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1644 | rth->fl.mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | rth->fl.fl4_src = saddr; |
| 1646 | rth->rt_src = saddr; |
| 1647 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1648 | rth->u.dst.tclassid = itag; |
| 1649 | #endif |
| 1650 | rth->rt_iif = |
| 1651 | rth->fl.iif = dev->ifindex; |
| 1652 | rth->u.dst.dev = &loopback_dev; |
| 1653 | dev_hold(rth->u.dst.dev); |
| 1654 | rth->idev = in_dev_get(rth->u.dst.dev); |
| 1655 | rth->fl.oif = 0; |
| 1656 | rth->rt_gateway = daddr; |
| 1657 | rth->rt_spec_dst= spec_dst; |
| 1658 | rth->rt_type = RTN_MULTICAST; |
| 1659 | rth->rt_flags = RTCF_MULTICAST; |
| 1660 | if (our) { |
| 1661 | rth->u.dst.input= ip_local_deliver; |
| 1662 | rth->rt_flags |= RTCF_LOCAL; |
| 1663 | } |
| 1664 | |
| 1665 | #ifdef CONFIG_IP_MROUTE |
| 1666 | if (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev)) |
| 1667 | rth->u.dst.input = ip_mr_input; |
| 1668 | #endif |
| 1669 | RT_CACHE_STAT_INC(in_slow_mc); |
| 1670 | |
| 1671 | in_dev_put(in_dev); |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1672 | hash = rt_hash(daddr, saddr, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst); |
| 1674 | |
| 1675 | e_nobufs: |
| 1676 | in_dev_put(in_dev); |
| 1677 | return -ENOBUFS; |
| 1678 | |
| 1679 | e_inval: |
| 1680 | in_dev_put(in_dev); |
| 1681 | return -EINVAL; |
| 1682 | } |
| 1683 | |
| 1684 | |
| 1685 | static void ip_handle_martian_source(struct net_device *dev, |
| 1686 | struct in_device *in_dev, |
| 1687 | struct sk_buff *skb, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1688 | __be32 daddr, |
| 1689 | __be32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | { |
| 1691 | RT_CACHE_STAT_INC(in_martian_src); |
| 1692 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1693 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { |
| 1694 | /* |
| 1695 | * RFC1812 recommendation, if source is martian, |
| 1696 | * the only hint is MAC header. |
| 1697 | */ |
| 1698 | printk(KERN_WARNING "martian source %u.%u.%u.%u from " |
| 1699 | "%u.%u.%u.%u, on dev %s\n", |
| 1700 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
Olaf Kirch | 0b7f22a | 2005-07-11 21:01:42 -0700 | [diff] [blame] | 1701 | if (dev->hard_header_len && skb->mac.raw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | int i; |
| 1703 | unsigned char *p = skb->mac.raw; |
| 1704 | printk(KERN_WARNING "ll header: "); |
| 1705 | for (i = 0; i < dev->hard_header_len; i++, p++) { |
| 1706 | printk("%02x", *p); |
| 1707 | if (i < (dev->hard_header_len - 1)) |
| 1708 | printk(":"); |
| 1709 | } |
| 1710 | printk("\n"); |
| 1711 | } |
| 1712 | } |
| 1713 | #endif |
| 1714 | } |
| 1715 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1716 | static inline int __mkroute_input(struct sk_buff *skb, |
| 1717 | struct fib_result* res, |
| 1718 | struct in_device *in_dev, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1719 | __be32 daddr, __be32 saddr, u32 tos, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1720 | struct rtable **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | { |
| 1722 | |
| 1723 | struct rtable *rth; |
| 1724 | int err; |
| 1725 | struct in_device *out_dev; |
| 1726 | unsigned flags = 0; |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 1727 | __be32 spec_dst; |
| 1728 | u32 itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | |
| 1730 | /* get a working reference to the output device */ |
| 1731 | out_dev = in_dev_get(FIB_RES_DEV(*res)); |
| 1732 | if (out_dev == NULL) { |
| 1733 | if (net_ratelimit()) |
| 1734 | printk(KERN_CRIT "Bug in ip_route_input" \ |
| 1735 | "_slow(). Please, report\n"); |
| 1736 | return -EINVAL; |
| 1737 | } |
| 1738 | |
| 1739 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1740 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | in_dev->dev, &spec_dst, &itag); |
| 1742 | if (err < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1743 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | saddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | err = -EINVAL; |
| 1747 | goto cleanup; |
| 1748 | } |
| 1749 | |
| 1750 | if (err) |
| 1751 | flags |= RTCF_DIRECTSRC; |
| 1752 | |
| 1753 | if (out_dev == in_dev && err && !(flags & (RTCF_NAT | RTCF_MASQ)) && |
| 1754 | (IN_DEV_SHARED_MEDIA(out_dev) || |
| 1755 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
| 1756 | flags |= RTCF_DOREDIRECT; |
| 1757 | |
| 1758 | if (skb->protocol != htons(ETH_P_IP)) { |
| 1759 | /* Not IP (i.e. ARP). Do not create route, if it is |
| 1760 | * invalid for proxy arp. DNAT routes are always valid. |
| 1761 | */ |
| 1762 | if (out_dev == in_dev && !(flags & RTCF_DNAT)) { |
| 1763 | err = -EINVAL; |
| 1764 | goto cleanup; |
| 1765 | } |
| 1766 | } |
| 1767 | |
| 1768 | |
| 1769 | rth = dst_alloc(&ipv4_dst_ops); |
| 1770 | if (!rth) { |
| 1771 | err = -ENOBUFS; |
| 1772 | goto cleanup; |
| 1773 | } |
| 1774 | |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 1775 | atomic_set(&rth->u.dst.__refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | rth->u.dst.flags= DST_HOST; |
| 1777 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
| 1778 | if (res->fi->fib_nhs > 1) |
| 1779 | rth->u.dst.flags |= DST_BALANCED; |
| 1780 | #endif |
| 1781 | if (in_dev->cnf.no_policy) |
| 1782 | rth->u.dst.flags |= DST_NOPOLICY; |
Patrick McHardy | 1b6651f | 2006-12-04 19:59:00 -0800 | [diff] [blame] | 1783 | if (out_dev->cnf.no_xfrm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | rth->u.dst.flags |= DST_NOXFRM; |
| 1785 | rth->fl.fl4_dst = daddr; |
| 1786 | rth->rt_dst = daddr; |
| 1787 | rth->fl.fl4_tos = tos; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1788 | rth->fl.mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | rth->fl.fl4_src = saddr; |
| 1790 | rth->rt_src = saddr; |
| 1791 | rth->rt_gateway = daddr; |
| 1792 | rth->rt_iif = |
| 1793 | rth->fl.iif = in_dev->dev->ifindex; |
| 1794 | rth->u.dst.dev = (out_dev)->dev; |
| 1795 | dev_hold(rth->u.dst.dev); |
| 1796 | rth->idev = in_dev_get(rth->u.dst.dev); |
| 1797 | rth->fl.oif = 0; |
| 1798 | rth->rt_spec_dst= spec_dst; |
| 1799 | |
| 1800 | rth->u.dst.input = ip_forward; |
| 1801 | rth->u.dst.output = ip_output; |
| 1802 | |
| 1803 | rt_set_nexthop(rth, res, itag); |
| 1804 | |
| 1805 | rth->rt_flags = flags; |
| 1806 | |
| 1807 | *result = rth; |
| 1808 | err = 0; |
| 1809 | cleanup: |
| 1810 | /* release the working reference to the output device */ |
| 1811 | in_dev_put(out_dev); |
| 1812 | return err; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1813 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1815 | static inline int ip_mkroute_input_def(struct sk_buff *skb, |
| 1816 | struct fib_result* res, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | const struct flowi *fl, |
| 1818 | struct in_device *in_dev, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1819 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | { |
Chuck Short | 7abaa27 | 2005-06-22 22:10:23 -0700 | [diff] [blame] | 1821 | struct rtable* rth = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | int err; |
| 1823 | unsigned hash; |
| 1824 | |
| 1825 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 1826 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) |
| 1827 | fib_select_multipath(fl, res); |
| 1828 | #endif |
| 1829 | |
| 1830 | /* create a routing cache entry */ |
| 1831 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); |
| 1832 | if (err) |
| 1833 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | |
| 1835 | /* put it into the cache */ |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1836 | hash = rt_hash(daddr, saddr, fl->iif); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1837 | return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | } |
| 1839 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1840 | static inline int ip_mkroute_input(struct sk_buff *skb, |
| 1841 | struct fib_result* res, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | const struct flowi *fl, |
| 1843 | struct in_device *in_dev, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1844 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | { |
| 1846 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 1847 | struct rtable* rth = NULL, *rtres; |
| 1848 | unsigned char hop, hopcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | int err = -EINVAL; |
| 1850 | unsigned int hash; |
| 1851 | |
| 1852 | if (res->fi) |
| 1853 | hopcount = res->fi->fib_nhs; |
| 1854 | else |
| 1855 | hopcount = 1; |
| 1856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | /* distinguish between multipath and singlepath */ |
| 1858 | if (hopcount < 2) |
| 1859 | return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, |
| 1860 | saddr, tos); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1861 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | /* add all alternatives to the routing cache */ |
| 1863 | for (hop = 0; hop < hopcount; hop++) { |
| 1864 | res->nh_sel = hop; |
| 1865 | |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 1866 | /* put reference to previous result */ |
| 1867 | if (hop) |
| 1868 | ip_rt_put(rtres); |
| 1869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | /* create a routing cache entry */ |
| 1871 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, |
| 1872 | &rth); |
| 1873 | if (err) |
| 1874 | return err; |
| 1875 | |
| 1876 | /* put it into the cache */ |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1877 | hash = rt_hash(daddr, saddr, fl->iif); |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 1878 | err = rt_intern_hash(hash, rth, &rtres); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | if (err) |
| 1880 | return err; |
| 1881 | |
| 1882 | /* forward hop information to multipath impl. */ |
| 1883 | multipath_set_nhinfo(rth, |
| 1884 | FIB_RES_NETWORK(*res), |
| 1885 | FIB_RES_NETMASK(*res), |
| 1886 | res->prefixlen, |
| 1887 | &FIB_RES_NH(*res)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | } |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 1889 | skb->dst = &rtres->u.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | return err; |
| 1891 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
| 1892 | return ip_mkroute_input_def(skb, res, fl, in_dev, daddr, saddr, tos); |
| 1893 | #endif /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
| 1894 | } |
| 1895 | |
| 1896 | |
| 1897 | /* |
| 1898 | * NOTE. We drop all the packets that has local source |
| 1899 | * addresses, because every properly looped back packet |
| 1900 | * must have correct destination already attached by output routine. |
| 1901 | * |
| 1902 | * Such approach solves two big problems: |
| 1903 | * 1. Not simplex devices are handled properly. |
| 1904 | * 2. IP spoofing attempts are filtered with 100% of guarantee. |
| 1905 | */ |
| 1906 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1907 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | u8 tos, struct net_device *dev) |
| 1909 | { |
| 1910 | struct fib_result res; |
| 1911 | struct in_device *in_dev = in_dev_get(dev); |
| 1912 | struct flowi fl = { .nl_u = { .ip4_u = |
| 1913 | { .daddr = daddr, |
| 1914 | .saddr = saddr, |
| 1915 | .tos = tos, |
| 1916 | .scope = RT_SCOPE_UNIVERSE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | } }, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1918 | .mark = skb->mark, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | .iif = dev->ifindex }; |
| 1920 | unsigned flags = 0; |
| 1921 | u32 itag = 0; |
| 1922 | struct rtable * rth; |
| 1923 | unsigned hash; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1924 | __be32 spec_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | int err = -EINVAL; |
| 1926 | int free_res = 0; |
| 1927 | |
| 1928 | /* IP on this device is disabled. */ |
| 1929 | |
| 1930 | if (!in_dev) |
| 1931 | goto out; |
| 1932 | |
| 1933 | /* Check for the most weird martians, which can be not detected |
| 1934 | by fib_lookup. |
| 1935 | */ |
| 1936 | |
| 1937 | if (MULTICAST(saddr) || BADCLASS(saddr) || LOOPBACK(saddr)) |
| 1938 | goto martian_source; |
| 1939 | |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1940 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | goto brd_input; |
| 1942 | |
| 1943 | /* Accept zero addresses only to limited broadcast; |
| 1944 | * I even do not know to fix it or not. Waiting for complains :-) |
| 1945 | */ |
| 1946 | if (ZERONET(saddr)) |
| 1947 | goto martian_source; |
| 1948 | |
| 1949 | if (BADCLASS(daddr) || ZERONET(daddr) || LOOPBACK(daddr)) |
| 1950 | goto martian_destination; |
| 1951 | |
| 1952 | /* |
| 1953 | * Now we are ready to route packet. |
| 1954 | */ |
| 1955 | if ((err = fib_lookup(&fl, &res)) != 0) { |
| 1956 | if (!IN_DEV_FORWARD(in_dev)) |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 1957 | goto e_hostunreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | goto no_route; |
| 1959 | } |
| 1960 | free_res = 1; |
| 1961 | |
| 1962 | RT_CACHE_STAT_INC(in_slow_tot); |
| 1963 | |
| 1964 | if (res.type == RTN_BROADCAST) |
| 1965 | goto brd_input; |
| 1966 | |
| 1967 | if (res.type == RTN_LOCAL) { |
| 1968 | int result; |
| 1969 | result = fib_validate_source(saddr, daddr, tos, |
| 1970 | loopback_dev.ifindex, |
| 1971 | dev, &spec_dst, &itag); |
| 1972 | if (result < 0) |
| 1973 | goto martian_source; |
| 1974 | if (result) |
| 1975 | flags |= RTCF_DIRECTSRC; |
| 1976 | spec_dst = daddr; |
| 1977 | goto local_input; |
| 1978 | } |
| 1979 | |
| 1980 | if (!IN_DEV_FORWARD(in_dev)) |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 1981 | goto e_hostunreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | if (res.type != RTN_UNICAST) |
| 1983 | goto martian_destination; |
| 1984 | |
| 1985 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); |
| 1986 | if (err == -ENOBUFS) |
| 1987 | goto e_nobufs; |
| 1988 | if (err == -EINVAL) |
| 1989 | goto e_inval; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | done: |
| 1992 | in_dev_put(in_dev); |
| 1993 | if (free_res) |
| 1994 | fib_res_put(&res); |
| 1995 | out: return err; |
| 1996 | |
| 1997 | brd_input: |
| 1998 | if (skb->protocol != htons(ETH_P_IP)) |
| 1999 | goto e_inval; |
| 2000 | |
| 2001 | if (ZERONET(saddr)) |
| 2002 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
| 2003 | else { |
| 2004 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, |
| 2005 | &itag); |
| 2006 | if (err < 0) |
| 2007 | goto martian_source; |
| 2008 | if (err) |
| 2009 | flags |= RTCF_DIRECTSRC; |
| 2010 | } |
| 2011 | flags |= RTCF_BROADCAST; |
| 2012 | res.type = RTN_BROADCAST; |
| 2013 | RT_CACHE_STAT_INC(in_brd); |
| 2014 | |
| 2015 | local_input: |
| 2016 | rth = dst_alloc(&ipv4_dst_ops); |
| 2017 | if (!rth) |
| 2018 | goto e_nobufs; |
| 2019 | |
| 2020 | rth->u.dst.output= ip_rt_bug; |
| 2021 | |
| 2022 | atomic_set(&rth->u.dst.__refcnt, 1); |
| 2023 | rth->u.dst.flags= DST_HOST; |
| 2024 | if (in_dev->cnf.no_policy) |
| 2025 | rth->u.dst.flags |= DST_NOPOLICY; |
| 2026 | rth->fl.fl4_dst = daddr; |
| 2027 | rth->rt_dst = daddr; |
| 2028 | rth->fl.fl4_tos = tos; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2029 | rth->fl.mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | rth->fl.fl4_src = saddr; |
| 2031 | rth->rt_src = saddr; |
| 2032 | #ifdef CONFIG_NET_CLS_ROUTE |
| 2033 | rth->u.dst.tclassid = itag; |
| 2034 | #endif |
| 2035 | rth->rt_iif = |
| 2036 | rth->fl.iif = dev->ifindex; |
| 2037 | rth->u.dst.dev = &loopback_dev; |
| 2038 | dev_hold(rth->u.dst.dev); |
| 2039 | rth->idev = in_dev_get(rth->u.dst.dev); |
| 2040 | rth->rt_gateway = daddr; |
| 2041 | rth->rt_spec_dst= spec_dst; |
| 2042 | rth->u.dst.input= ip_local_deliver; |
| 2043 | rth->rt_flags = flags|RTCF_LOCAL; |
| 2044 | if (res.type == RTN_UNREACHABLE) { |
| 2045 | rth->u.dst.input= ip_error; |
| 2046 | rth->u.dst.error= -err; |
| 2047 | rth->rt_flags &= ~RTCF_LOCAL; |
| 2048 | } |
| 2049 | rth->rt_type = res.type; |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2050 | hash = rt_hash(daddr, saddr, fl.iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
| 2052 | goto done; |
| 2053 | |
| 2054 | no_route: |
| 2055 | RT_CACHE_STAT_INC(in_no_route); |
| 2056 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 2057 | res.type = RTN_UNREACHABLE; |
| 2058 | goto local_input; |
| 2059 | |
| 2060 | /* |
| 2061 | * Do not cache martian addresses: they should be logged (RFC1812) |
| 2062 | */ |
| 2063 | martian_destination: |
| 2064 | RT_CACHE_STAT_INC(in_martian_dst); |
| 2065 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 2066 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) |
| 2067 | printk(KERN_WARNING "martian destination %u.%u.%u.%u from " |
| 2068 | "%u.%u.%u.%u, dev %s\n", |
| 2069 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
| 2070 | #endif |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2071 | |
| 2072 | e_hostunreach: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2073 | err = -EHOSTUNREACH; |
| 2074 | goto done; |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2075 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | e_inval: |
| 2077 | err = -EINVAL; |
| 2078 | goto done; |
| 2079 | |
| 2080 | e_nobufs: |
| 2081 | err = -ENOBUFS; |
| 2082 | goto done; |
| 2083 | |
| 2084 | martian_source: |
| 2085 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
| 2086 | goto e_inval; |
| 2087 | } |
| 2088 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2089 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | u8 tos, struct net_device *dev) |
| 2091 | { |
| 2092 | struct rtable * rth; |
| 2093 | unsigned hash; |
| 2094 | int iif = dev->ifindex; |
| 2095 | |
| 2096 | tos &= IPTOS_RT_MASK; |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2097 | hash = rt_hash(daddr, saddr, iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | |
| 2099 | rcu_read_lock(); |
| 2100 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 2101 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | if (rth->fl.fl4_dst == daddr && |
| 2103 | rth->fl.fl4_src == saddr && |
| 2104 | rth->fl.iif == iif && |
| 2105 | rth->fl.oif == 0 && |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2106 | rth->fl.mark == skb->mark && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | rth->fl.fl4_tos == tos) { |
| 2108 | rth->u.dst.lastuse = jiffies; |
| 2109 | dst_hold(&rth->u.dst); |
| 2110 | rth->u.dst.__use++; |
| 2111 | RT_CACHE_STAT_INC(in_hit); |
| 2112 | rcu_read_unlock(); |
| 2113 | skb->dst = (struct dst_entry*)rth; |
| 2114 | return 0; |
| 2115 | } |
| 2116 | RT_CACHE_STAT_INC(in_hlist_search); |
| 2117 | } |
| 2118 | rcu_read_unlock(); |
| 2119 | |
| 2120 | /* Multicast recognition logic is moved from route cache to here. |
| 2121 | The problem was that too many Ethernet cards have broken/missing |
| 2122 | hardware multicast filters :-( As result the host on multicasting |
| 2123 | network acquires a lot of useless route cache entries, sort of |
| 2124 | SDR messages from all the world. Now we try to get rid of them. |
| 2125 | Really, provided software IP multicast filter is organized |
| 2126 | reasonably (at least, hashed), it does not result in a slowdown |
| 2127 | comparing with route cache reject entries. |
| 2128 | Note, that multicast routers are not affected, because |
| 2129 | route cache entry is created eventually. |
| 2130 | */ |
| 2131 | if (MULTICAST(daddr)) { |
| 2132 | struct in_device *in_dev; |
| 2133 | |
| 2134 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2135 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | int our = ip_check_mc(in_dev, daddr, saddr, |
| 2137 | skb->nh.iph->protocol); |
| 2138 | if (our |
| 2139 | #ifdef CONFIG_IP_MROUTE |
| 2140 | || (!LOCAL_MCAST(daddr) && IN_DEV_MFORWARD(in_dev)) |
| 2141 | #endif |
| 2142 | ) { |
| 2143 | rcu_read_unlock(); |
| 2144 | return ip_route_input_mc(skb, daddr, saddr, |
| 2145 | tos, dev, our); |
| 2146 | } |
| 2147 | } |
| 2148 | rcu_read_unlock(); |
| 2149 | return -EINVAL; |
| 2150 | } |
| 2151 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); |
| 2152 | } |
| 2153 | |
| 2154 | static inline int __mkroute_output(struct rtable **result, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2155 | struct fib_result* res, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | const struct flowi *fl, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2157 | const struct flowi *oldflp, |
| 2158 | struct net_device *dev_out, |
| 2159 | unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | { |
| 2161 | struct rtable *rth; |
| 2162 | struct in_device *in_dev; |
| 2163 | u32 tos = RT_FL_TOS(oldflp); |
| 2164 | int err = 0; |
| 2165 | |
| 2166 | if (LOOPBACK(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
| 2167 | return -EINVAL; |
| 2168 | |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2169 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | res->type = RTN_BROADCAST; |
| 2171 | else if (MULTICAST(fl->fl4_dst)) |
| 2172 | res->type = RTN_MULTICAST; |
| 2173 | else if (BADCLASS(fl->fl4_dst) || ZERONET(fl->fl4_dst)) |
| 2174 | return -EINVAL; |
| 2175 | |
| 2176 | if (dev_out->flags & IFF_LOOPBACK) |
| 2177 | flags |= RTCF_LOCAL; |
| 2178 | |
| 2179 | /* get work reference to inet device */ |
| 2180 | in_dev = in_dev_get(dev_out); |
| 2181 | if (!in_dev) |
| 2182 | return -EINVAL; |
| 2183 | |
| 2184 | if (res->type == RTN_BROADCAST) { |
| 2185 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
| 2186 | if (res->fi) { |
| 2187 | fib_info_put(res->fi); |
| 2188 | res->fi = NULL; |
| 2189 | } |
| 2190 | } else if (res->type == RTN_MULTICAST) { |
| 2191 | flags |= RTCF_MULTICAST|RTCF_LOCAL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2192 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | oldflp->proto)) |
| 2194 | flags &= ~RTCF_LOCAL; |
| 2195 | /* If multicast route do not exist use |
| 2196 | default one, but do not gateway in this case. |
| 2197 | Yes, it is hack. |
| 2198 | */ |
| 2199 | if (res->fi && res->prefixlen < 4) { |
| 2200 | fib_info_put(res->fi); |
| 2201 | res->fi = NULL; |
| 2202 | } |
| 2203 | } |
| 2204 | |
| 2205 | |
| 2206 | rth = dst_alloc(&ipv4_dst_ops); |
| 2207 | if (!rth) { |
| 2208 | err = -ENOBUFS; |
| 2209 | goto cleanup; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 2212 | atomic_set(&rth->u.dst.__refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | rth->u.dst.flags= DST_HOST; |
| 2214 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
| 2215 | if (res->fi) { |
| 2216 | rth->rt_multipath_alg = res->fi->fib_mp_alg; |
| 2217 | if (res->fi->fib_nhs > 1) |
| 2218 | rth->u.dst.flags |= DST_BALANCED; |
| 2219 | } |
| 2220 | #endif |
| 2221 | if (in_dev->cnf.no_xfrm) |
| 2222 | rth->u.dst.flags |= DST_NOXFRM; |
| 2223 | if (in_dev->cnf.no_policy) |
| 2224 | rth->u.dst.flags |= DST_NOPOLICY; |
| 2225 | |
| 2226 | rth->fl.fl4_dst = oldflp->fl4_dst; |
| 2227 | rth->fl.fl4_tos = tos; |
| 2228 | rth->fl.fl4_src = oldflp->fl4_src; |
| 2229 | rth->fl.oif = oldflp->oif; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2230 | rth->fl.mark = oldflp->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | rth->rt_dst = fl->fl4_dst; |
| 2232 | rth->rt_src = fl->fl4_src; |
| 2233 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2234 | /* get references to the devices that are to be hold by the routing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | cache entry */ |
| 2236 | rth->u.dst.dev = dev_out; |
| 2237 | dev_hold(dev_out); |
| 2238 | rth->idev = in_dev_get(dev_out); |
| 2239 | rth->rt_gateway = fl->fl4_dst; |
| 2240 | rth->rt_spec_dst= fl->fl4_src; |
| 2241 | |
| 2242 | rth->u.dst.output=ip_output; |
| 2243 | |
| 2244 | RT_CACHE_STAT_INC(out_slow_tot); |
| 2245 | |
| 2246 | if (flags & RTCF_LOCAL) { |
| 2247 | rth->u.dst.input = ip_local_deliver; |
| 2248 | rth->rt_spec_dst = fl->fl4_dst; |
| 2249 | } |
| 2250 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
| 2251 | rth->rt_spec_dst = fl->fl4_src; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2252 | if (flags & RTCF_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | !(dev_out->flags & IFF_LOOPBACK)) { |
| 2254 | rth->u.dst.output = ip_mc_output; |
| 2255 | RT_CACHE_STAT_INC(out_slow_mc); |
| 2256 | } |
| 2257 | #ifdef CONFIG_IP_MROUTE |
| 2258 | if (res->type == RTN_MULTICAST) { |
| 2259 | if (IN_DEV_MFORWARD(in_dev) && |
| 2260 | !LOCAL_MCAST(oldflp->fl4_dst)) { |
| 2261 | rth->u.dst.input = ip_mr_input; |
| 2262 | rth->u.dst.output = ip_mc_output; |
| 2263 | } |
| 2264 | } |
| 2265 | #endif |
| 2266 | } |
| 2267 | |
| 2268 | rt_set_nexthop(rth, res, 0); |
| 2269 | |
| 2270 | rth->rt_flags = flags; |
| 2271 | |
| 2272 | *result = rth; |
| 2273 | cleanup: |
| 2274 | /* release work reference to inet device */ |
| 2275 | in_dev_put(in_dev); |
| 2276 | |
| 2277 | return err; |
| 2278 | } |
| 2279 | |
| 2280 | static inline int ip_mkroute_output_def(struct rtable **rp, |
| 2281 | struct fib_result* res, |
| 2282 | const struct flowi *fl, |
| 2283 | const struct flowi *oldflp, |
| 2284 | struct net_device *dev_out, |
| 2285 | unsigned flags) |
| 2286 | { |
Chuck Short | 7abaa27 | 2005-06-22 22:10:23 -0700 | [diff] [blame] | 2287 | struct rtable *rth = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
| 2289 | unsigned hash; |
| 2290 | if (err == 0) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2291 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | err = rt_intern_hash(hash, rth, rp); |
| 2293 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | return err; |
| 2296 | } |
| 2297 | |
| 2298 | static inline int ip_mkroute_output(struct rtable** rp, |
| 2299 | struct fib_result* res, |
| 2300 | const struct flowi *fl, |
| 2301 | const struct flowi *oldflp, |
| 2302 | struct net_device *dev_out, |
| 2303 | unsigned flags) |
| 2304 | { |
| 2305 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | unsigned char hop; |
| 2307 | unsigned hash; |
| 2308 | int err = -EINVAL; |
Chuck Short | 7abaa27 | 2005-06-22 22:10:23 -0700 | [diff] [blame] | 2309 | struct rtable *rth = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2310 | |
| 2311 | if (res->fi && res->fi->fib_nhs > 1) { |
| 2312 | unsigned char hopcount = res->fi->fib_nhs; |
| 2313 | |
| 2314 | for (hop = 0; hop < hopcount; hop++) { |
| 2315 | struct net_device *dev2nexthop; |
| 2316 | |
| 2317 | res->nh_sel = hop; |
| 2318 | |
| 2319 | /* hold a work reference to the output device */ |
| 2320 | dev2nexthop = FIB_RES_DEV(*res); |
| 2321 | dev_hold(dev2nexthop); |
| 2322 | |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 2323 | /* put reference to previous result */ |
| 2324 | if (hop) |
| 2325 | ip_rt_put(*rp); |
| 2326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | err = __mkroute_output(&rth, res, fl, oldflp, |
| 2328 | dev2nexthop, flags); |
| 2329 | |
| 2330 | if (err != 0) |
| 2331 | goto cleanup; |
| 2332 | |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2333 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, |
| 2334 | oldflp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | err = rt_intern_hash(hash, rth, rp); |
| 2336 | |
| 2337 | /* forward hop information to multipath impl. */ |
| 2338 | multipath_set_nhinfo(rth, |
| 2339 | FIB_RES_NETWORK(*res), |
| 2340 | FIB_RES_NETMASK(*res), |
| 2341 | res->prefixlen, |
| 2342 | &FIB_RES_NH(*res)); |
| 2343 | cleanup: |
| 2344 | /* release work reference to output device */ |
| 2345 | dev_put(dev2nexthop); |
| 2346 | |
| 2347 | if (err != 0) |
| 2348 | return err; |
| 2349 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | return err; |
| 2351 | } else { |
| 2352 | return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out, |
| 2353 | flags); |
| 2354 | } |
| 2355 | #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */ |
| 2356 | return ip_mkroute_output_def(rp, res, fl, oldflp, dev_out, flags); |
| 2357 | #endif |
| 2358 | } |
| 2359 | |
| 2360 | /* |
| 2361 | * Major route resolver routine. |
| 2362 | */ |
| 2363 | |
| 2364 | static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp) |
| 2365 | { |
| 2366 | u32 tos = RT_FL_TOS(oldflp); |
| 2367 | struct flowi fl = { .nl_u = { .ip4_u = |
| 2368 | { .daddr = oldflp->fl4_dst, |
| 2369 | .saddr = oldflp->fl4_src, |
| 2370 | .tos = tos & IPTOS_RT_MASK, |
| 2371 | .scope = ((tos & RTO_ONLINK) ? |
| 2372 | RT_SCOPE_LINK : |
| 2373 | RT_SCOPE_UNIVERSE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | } }, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2375 | .mark = oldflp->mark, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | .iif = loopback_dev.ifindex, |
| 2377 | .oif = oldflp->oif }; |
| 2378 | struct fib_result res; |
| 2379 | unsigned flags = 0; |
| 2380 | struct net_device *dev_out = NULL; |
| 2381 | int free_res = 0; |
| 2382 | int err; |
| 2383 | |
| 2384 | |
| 2385 | res.fi = NULL; |
| 2386 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 2387 | res.r = NULL; |
| 2388 | #endif |
| 2389 | |
| 2390 | if (oldflp->fl4_src) { |
| 2391 | err = -EINVAL; |
| 2392 | if (MULTICAST(oldflp->fl4_src) || |
| 2393 | BADCLASS(oldflp->fl4_src) || |
| 2394 | ZERONET(oldflp->fl4_src)) |
| 2395 | goto out; |
| 2396 | |
| 2397 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
| 2398 | dev_out = ip_dev_find(oldflp->fl4_src); |
| 2399 | if (dev_out == NULL) |
| 2400 | goto out; |
| 2401 | |
| 2402 | /* I removed check for oif == dev_out->oif here. |
| 2403 | It was wrong for two reasons: |
| 2404 | 1. ip_dev_find(saddr) can return wrong iface, if saddr is |
| 2405 | assigned to multiple interfaces. |
| 2406 | 2. Moreover, we are allowed to send packets with saddr |
| 2407 | of another iface. --ANK |
| 2408 | */ |
| 2409 | |
| 2410 | if (oldflp->oif == 0 |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2411 | && (MULTICAST(oldflp->fl4_dst) || oldflp->fl4_dst == htonl(0xFFFFFFFF))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | /* Special hack: user can direct multicasts |
| 2413 | and limited broadcast via necessary interface |
| 2414 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. |
| 2415 | This hack is not just for fun, it allows |
| 2416 | vic,vat and friends to work. |
| 2417 | They bind socket to loopback, set ttl to zero |
| 2418 | and expect that it will work. |
| 2419 | From the viewpoint of routing cache they are broken, |
| 2420 | because we are not allowed to build multicast path |
| 2421 | with loopback source addr (look, routing cache |
| 2422 | cannot know, that ttl is zero, so that packet |
| 2423 | will not leave this host and route is valid). |
| 2424 | Luckily, this hack is good workaround. |
| 2425 | */ |
| 2426 | |
| 2427 | fl.oif = dev_out->ifindex; |
| 2428 | goto make_route; |
| 2429 | } |
| 2430 | if (dev_out) |
| 2431 | dev_put(dev_out); |
| 2432 | dev_out = NULL; |
| 2433 | } |
| 2434 | |
| 2435 | |
| 2436 | if (oldflp->oif) { |
| 2437 | dev_out = dev_get_by_index(oldflp->oif); |
| 2438 | err = -ENODEV; |
| 2439 | if (dev_out == NULL) |
| 2440 | goto out; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2441 | |
| 2442 | /* RACE: Check return value of inet_select_addr instead. */ |
| 2443 | if (__in_dev_get_rtnl(dev_out) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | dev_put(dev_out); |
| 2445 | goto out; /* Wrong error code */ |
| 2446 | } |
| 2447 | |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2448 | if (LOCAL_MCAST(oldflp->fl4_dst) || oldflp->fl4_dst == htonl(0xFFFFFFFF)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | if (!fl.fl4_src) |
| 2450 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2451 | RT_SCOPE_LINK); |
| 2452 | goto make_route; |
| 2453 | } |
| 2454 | if (!fl.fl4_src) { |
| 2455 | if (MULTICAST(oldflp->fl4_dst)) |
| 2456 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2457 | fl.fl4_scope); |
| 2458 | else if (!oldflp->fl4_dst) |
| 2459 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2460 | RT_SCOPE_HOST); |
| 2461 | } |
| 2462 | } |
| 2463 | |
| 2464 | if (!fl.fl4_dst) { |
| 2465 | fl.fl4_dst = fl.fl4_src; |
| 2466 | if (!fl.fl4_dst) |
| 2467 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); |
| 2468 | if (dev_out) |
| 2469 | dev_put(dev_out); |
| 2470 | dev_out = &loopback_dev; |
| 2471 | dev_hold(dev_out); |
| 2472 | fl.oif = loopback_dev.ifindex; |
| 2473 | res.type = RTN_LOCAL; |
| 2474 | flags |= RTCF_LOCAL; |
| 2475 | goto make_route; |
| 2476 | } |
| 2477 | |
| 2478 | if (fib_lookup(&fl, &res)) { |
| 2479 | res.fi = NULL; |
| 2480 | if (oldflp->oif) { |
| 2481 | /* Apparently, routing tables are wrong. Assume, |
| 2482 | that the destination is on link. |
| 2483 | |
| 2484 | WHY? DW. |
| 2485 | Because we are allowed to send to iface |
| 2486 | even if it has NO routes and NO assigned |
| 2487 | addresses. When oif is specified, routing |
| 2488 | tables are looked up with only one purpose: |
| 2489 | to catch if destination is gatewayed, rather than |
| 2490 | direct. Moreover, if MSG_DONTROUTE is set, |
| 2491 | we send packet, ignoring both routing tables |
| 2492 | and ifaddr state. --ANK |
| 2493 | |
| 2494 | |
| 2495 | We could make it even if oif is unknown, |
| 2496 | likely IPv6, but we do not. |
| 2497 | */ |
| 2498 | |
| 2499 | if (fl.fl4_src == 0) |
| 2500 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2501 | RT_SCOPE_LINK); |
| 2502 | res.type = RTN_UNICAST; |
| 2503 | goto make_route; |
| 2504 | } |
| 2505 | if (dev_out) |
| 2506 | dev_put(dev_out); |
| 2507 | err = -ENETUNREACH; |
| 2508 | goto out; |
| 2509 | } |
| 2510 | free_res = 1; |
| 2511 | |
| 2512 | if (res.type == RTN_LOCAL) { |
| 2513 | if (!fl.fl4_src) |
| 2514 | fl.fl4_src = fl.fl4_dst; |
| 2515 | if (dev_out) |
| 2516 | dev_put(dev_out); |
| 2517 | dev_out = &loopback_dev; |
| 2518 | dev_hold(dev_out); |
| 2519 | fl.oif = dev_out->ifindex; |
| 2520 | if (res.fi) |
| 2521 | fib_info_put(res.fi); |
| 2522 | res.fi = NULL; |
| 2523 | flags |= RTCF_LOCAL; |
| 2524 | goto make_route; |
| 2525 | } |
| 2526 | |
| 2527 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 2528 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
| 2529 | fib_select_multipath(&fl, &res); |
| 2530 | else |
| 2531 | #endif |
| 2532 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) |
| 2533 | fib_select_default(&fl, &res); |
| 2534 | |
| 2535 | if (!fl.fl4_src) |
| 2536 | fl.fl4_src = FIB_RES_PREFSRC(res); |
| 2537 | |
| 2538 | if (dev_out) |
| 2539 | dev_put(dev_out); |
| 2540 | dev_out = FIB_RES_DEV(res); |
| 2541 | dev_hold(dev_out); |
| 2542 | fl.oif = dev_out->ifindex; |
| 2543 | |
| 2544 | |
| 2545 | make_route: |
| 2546 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); |
| 2547 | |
| 2548 | |
| 2549 | if (free_res) |
| 2550 | fib_res_put(&res); |
| 2551 | if (dev_out) |
| 2552 | dev_put(dev_out); |
| 2553 | out: return err; |
| 2554 | } |
| 2555 | |
| 2556 | int __ip_route_output_key(struct rtable **rp, const struct flowi *flp) |
| 2557 | { |
| 2558 | unsigned hash; |
| 2559 | struct rtable *rth; |
| 2560 | |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2561 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | |
| 2563 | rcu_read_lock_bh(); |
| 2564 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 2565 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | if (rth->fl.fl4_dst == flp->fl4_dst && |
| 2567 | rth->fl.fl4_src == flp->fl4_src && |
| 2568 | rth->fl.iif == 0 && |
| 2569 | rth->fl.oif == flp->oif && |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2570 | rth->fl.mark == flp->mark && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2571 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
| 2572 | (IPTOS_RT_MASK | RTO_ONLINK))) { |
| 2573 | |
| 2574 | /* check for multipath routes and choose one if |
| 2575 | * necessary |
| 2576 | */ |
| 2577 | if (multipath_select_route(flp, rth, rp)) { |
| 2578 | dst_hold(&(*rp)->u.dst); |
| 2579 | RT_CACHE_STAT_INC(out_hit); |
| 2580 | rcu_read_unlock_bh(); |
| 2581 | return 0; |
| 2582 | } |
| 2583 | |
| 2584 | rth->u.dst.lastuse = jiffies; |
| 2585 | dst_hold(&rth->u.dst); |
| 2586 | rth->u.dst.__use++; |
| 2587 | RT_CACHE_STAT_INC(out_hit); |
| 2588 | rcu_read_unlock_bh(); |
| 2589 | *rp = rth; |
| 2590 | return 0; |
| 2591 | } |
| 2592 | RT_CACHE_STAT_INC(out_hlist_search); |
| 2593 | } |
| 2594 | rcu_read_unlock_bh(); |
| 2595 | |
| 2596 | return ip_route_output_slow(rp, flp); |
| 2597 | } |
| 2598 | |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2599 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
| 2600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags) |
| 2602 | { |
| 2603 | int err; |
| 2604 | |
| 2605 | if ((err = __ip_route_output_key(rp, flp)) != 0) |
| 2606 | return err; |
| 2607 | |
| 2608 | if (flp->proto) { |
| 2609 | if (!flp->fl4_src) |
| 2610 | flp->fl4_src = (*rp)->rt_src; |
| 2611 | if (!flp->fl4_dst) |
| 2612 | flp->fl4_dst = (*rp)->rt_dst; |
| 2613 | return xfrm_lookup((struct dst_entry **)rp, flp, sk, flags); |
| 2614 | } |
| 2615 | |
| 2616 | return 0; |
| 2617 | } |
| 2618 | |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2619 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
| 2620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | int ip_route_output_key(struct rtable **rp, struct flowi *flp) |
| 2622 | { |
| 2623 | return ip_route_output_flow(rp, flp, NULL, 0); |
| 2624 | } |
| 2625 | |
| 2626 | static int rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2627 | int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | { |
| 2629 | struct rtable *rt = (struct rtable*)skb->dst; |
| 2630 | struct rtmsg *r; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2631 | struct nlmsghdr *nlh; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2632 | long expires; |
| 2633 | u32 id = 0, ts = 0, tsage = 0, error; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2634 | |
| 2635 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); |
| 2636 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2637 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2638 | |
| 2639 | r = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | r->rtm_family = AF_INET; |
| 2641 | r->rtm_dst_len = 32; |
| 2642 | r->rtm_src_len = 0; |
| 2643 | r->rtm_tos = rt->fl.fl4_tos; |
| 2644 | r->rtm_table = RT_TABLE_MAIN; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2645 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2646 | r->rtm_type = rt->rt_type; |
| 2647 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2648 | r->rtm_protocol = RTPROT_UNSPEC; |
| 2649 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 2650 | if (rt->rt_flags & RTCF_NOTIFY) |
| 2651 | r->rtm_flags |= RTM_F_NOTIFY; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2652 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2653 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | if (rt->fl.fl4_src) { |
| 2656 | r->rtm_src_len = 32; |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2657 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2658 | } |
| 2659 | if (rt->u.dst.dev) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2660 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2661 | #ifdef CONFIG_NET_CLS_ROUTE |
| 2662 | if (rt->u.dst.tclassid) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2663 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2664 | #endif |
| 2665 | #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2666 | if (rt->rt_multipath_alg != IP_MP_ALG_NONE) |
| 2667 | NLA_PUT_U32(skb, RTA_MP_ALGO, rt->rt_multipath_alg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | #endif |
| 2669 | if (rt->fl.iif) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2670 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2671 | else if (rt->rt_src != rt->fl.fl4_src) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2672 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | if (rt->rt_dst != rt->rt_gateway) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2675 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2678 | goto nla_put_failure; |
| 2679 | |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2680 | error = rt->u.dst.error; |
| 2681 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2682 | if (rt->peer) { |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2683 | id = rt->peer->ip_id_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | if (rt->peer->tcp_ts_stamp) { |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2685 | ts = rt->peer->tcp_ts; |
| 2686 | tsage = xtime.tv_sec - rt->peer->tcp_ts_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2687 | } |
| 2688 | } |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | if (rt->fl.iif) { |
| 2691 | #ifdef CONFIG_IP_MROUTE |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2692 | __be32 dst = rt->rt_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | |
| 2694 | if (MULTICAST(dst) && !LOCAL_MCAST(dst) && |
| 2695 | ipv4_devconf.mc_forwarding) { |
| 2696 | int err = ipmr_get_route(skb, r, nowait); |
| 2697 | if (err <= 0) { |
| 2698 | if (!nowait) { |
| 2699 | if (err == 0) |
| 2700 | return 0; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2701 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | } else { |
| 2703 | if (err == -EMSGSIZE) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2704 | goto nla_put_failure; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2705 | error = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | } |
| 2707 | } |
| 2708 | } else |
| 2709 | #endif |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2710 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | } |
| 2712 | |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2713 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
| 2714 | expires, error) < 0) |
| 2715 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2716 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2717 | return nlmsg_end(skb, nlh); |
| 2718 | |
| 2719 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2720 | nlmsg_cancel(skb, nlh); |
| 2721 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2722 | } |
| 2723 | |
| 2724 | int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
| 2725 | { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2726 | struct rtmsg *rtm; |
| 2727 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2728 | struct rtable *rt = NULL; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2729 | __be32 dst = 0; |
| 2730 | __be32 src = 0; |
| 2731 | u32 iif; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2732 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2733 | struct sk_buff *skb; |
| 2734 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2735 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
| 2736 | if (err < 0) |
| 2737 | goto errout; |
| 2738 | |
| 2739 | rtm = nlmsg_data(nlh); |
| 2740 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2741 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2742 | if (skb == NULL) { |
| 2743 | err = -ENOBUFS; |
| 2744 | goto errout; |
| 2745 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | |
| 2747 | /* Reserve room for dummy headers, this skb can pass |
| 2748 | through good chunk of routing engine. |
| 2749 | */ |
Stephen Hemminger | d2c962b | 2006-04-17 17:27:11 -0700 | [diff] [blame] | 2750 | skb->mac.raw = skb->nh.raw = skb->data; |
| 2751 | |
| 2752 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ |
| 2753 | skb->nh.iph->protocol = IPPROTO_ICMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
| 2755 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2756 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
| 2757 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2758 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | |
| 2760 | if (iif) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2761 | struct net_device *dev; |
| 2762 | |
| 2763 | dev = __dev_get_by_index(iif); |
| 2764 | if (dev == NULL) { |
| 2765 | err = -ENODEV; |
| 2766 | goto errout_free; |
| 2767 | } |
| 2768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | skb->protocol = htons(ETH_P_IP); |
| 2770 | skb->dev = dev; |
| 2771 | local_bh_disable(); |
| 2772 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); |
| 2773 | local_bh_enable(); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2774 | |
| 2775 | rt = (struct rtable*) skb->dst; |
| 2776 | if (err == 0 && rt->u.dst.error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2777 | err = -rt->u.dst.error; |
| 2778 | } else { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2779 | struct flowi fl = { |
| 2780 | .nl_u = { |
| 2781 | .ip4_u = { |
| 2782 | .daddr = dst, |
| 2783 | .saddr = src, |
| 2784 | .tos = rtm->rtm_tos, |
| 2785 | }, |
| 2786 | }, |
| 2787 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, |
| 2788 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | err = ip_route_output_key(&rt, &fl); |
| 2790 | } |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | if (err) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2793 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | |
| 2795 | skb->dst = &rt->u.dst; |
| 2796 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 2797 | rt->rt_flags |= RTCF_NOTIFY; |
| 2798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | err = rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2800 | RTM_NEWROUTE, 0, 0); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2801 | if (err <= 0) |
| 2802 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2804 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2805 | errout: |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2806 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2808 | errout_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | kfree_skb(skb); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2810 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2811 | } |
| 2812 | |
| 2813 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 2814 | { |
| 2815 | struct rtable *rt; |
| 2816 | int h, s_h; |
| 2817 | int idx, s_idx; |
| 2818 | |
| 2819 | s_h = cb->args[0]; |
| 2820 | s_idx = idx = cb->args[1]; |
| 2821 | for (h = 0; h <= rt_hash_mask; h++) { |
| 2822 | if (h < s_h) continue; |
| 2823 | if (h > s_h) |
| 2824 | s_idx = 0; |
| 2825 | rcu_read_lock_bh(); |
| 2826 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 2827 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2828 | if (idx < s_idx) |
| 2829 | continue; |
| 2830 | skb->dst = dst_clone(&rt->u.dst); |
| 2831 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2832 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2833 | 1, NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | dst_release(xchg(&skb->dst, NULL)); |
| 2835 | rcu_read_unlock_bh(); |
| 2836 | goto done; |
| 2837 | } |
| 2838 | dst_release(xchg(&skb->dst, NULL)); |
| 2839 | } |
| 2840 | rcu_read_unlock_bh(); |
| 2841 | } |
| 2842 | |
| 2843 | done: |
| 2844 | cb->args[0] = h; |
| 2845 | cb->args[1] = idx; |
| 2846 | return skb->len; |
| 2847 | } |
| 2848 | |
| 2849 | void ip_rt_multicast_event(struct in_device *in_dev) |
| 2850 | { |
| 2851 | rt_cache_flush(0); |
| 2852 | } |
| 2853 | |
| 2854 | #ifdef CONFIG_SYSCTL |
| 2855 | static int flush_delay; |
| 2856 | |
| 2857 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, |
| 2858 | struct file *filp, void __user *buffer, |
| 2859 | size_t *lenp, loff_t *ppos) |
| 2860 | { |
| 2861 | if (write) { |
| 2862 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
| 2863 | rt_cache_flush(flush_delay); |
| 2864 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2865 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | |
| 2867 | return -EINVAL; |
| 2868 | } |
| 2869 | |
| 2870 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, |
| 2871 | int __user *name, |
| 2872 | int nlen, |
| 2873 | void __user *oldval, |
| 2874 | size_t __user *oldlenp, |
| 2875 | void __user *newval, |
Alexey Dobriyan | 1f29bcd | 2006-12-10 02:19:10 -0800 | [diff] [blame] | 2876 | size_t newlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2877 | { |
| 2878 | int delay; |
| 2879 | if (newlen != sizeof(int)) |
| 2880 | return -EINVAL; |
| 2881 | if (get_user(delay, (int __user *)newval)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2882 | return -EFAULT; |
| 2883 | rt_cache_flush(delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2884 | return 0; |
| 2885 | } |
| 2886 | |
| 2887 | ctl_table ipv4_route_table[] = { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2888 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | .ctl_name = NET_IPV4_ROUTE_FLUSH, |
| 2890 | .procname = "flush", |
| 2891 | .data = &flush_delay, |
| 2892 | .maxlen = sizeof(int), |
Dave Jones | 7e3e036 | 2005-04-28 12:11:03 -0700 | [diff] [blame] | 2893 | .mode = 0200, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
| 2895 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, |
| 2896 | }, |
| 2897 | { |
| 2898 | .ctl_name = NET_IPV4_ROUTE_MIN_DELAY, |
| 2899 | .procname = "min_delay", |
| 2900 | .data = &ip_rt_min_delay, |
| 2901 | .maxlen = sizeof(int), |
| 2902 | .mode = 0644, |
| 2903 | .proc_handler = &proc_dointvec_jiffies, |
| 2904 | .strategy = &sysctl_jiffies, |
| 2905 | }, |
| 2906 | { |
| 2907 | .ctl_name = NET_IPV4_ROUTE_MAX_DELAY, |
| 2908 | .procname = "max_delay", |
| 2909 | .data = &ip_rt_max_delay, |
| 2910 | .maxlen = sizeof(int), |
| 2911 | .mode = 0644, |
| 2912 | .proc_handler = &proc_dointvec_jiffies, |
| 2913 | .strategy = &sysctl_jiffies, |
| 2914 | }, |
| 2915 | { |
| 2916 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, |
| 2917 | .procname = "gc_thresh", |
| 2918 | .data = &ipv4_dst_ops.gc_thresh, |
| 2919 | .maxlen = sizeof(int), |
| 2920 | .mode = 0644, |
| 2921 | .proc_handler = &proc_dointvec, |
| 2922 | }, |
| 2923 | { |
| 2924 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, |
| 2925 | .procname = "max_size", |
| 2926 | .data = &ip_rt_max_size, |
| 2927 | .maxlen = sizeof(int), |
| 2928 | .mode = 0644, |
| 2929 | .proc_handler = &proc_dointvec, |
| 2930 | }, |
| 2931 | { |
| 2932 | /* Deprecated. Use gc_min_interval_ms */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
| 2935 | .procname = "gc_min_interval", |
| 2936 | .data = &ip_rt_gc_min_interval, |
| 2937 | .maxlen = sizeof(int), |
| 2938 | .mode = 0644, |
| 2939 | .proc_handler = &proc_dointvec_jiffies, |
| 2940 | .strategy = &sysctl_jiffies, |
| 2941 | }, |
| 2942 | { |
| 2943 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, |
| 2944 | .procname = "gc_min_interval_ms", |
| 2945 | .data = &ip_rt_gc_min_interval, |
| 2946 | .maxlen = sizeof(int), |
| 2947 | .mode = 0644, |
| 2948 | .proc_handler = &proc_dointvec_ms_jiffies, |
| 2949 | .strategy = &sysctl_ms_jiffies, |
| 2950 | }, |
| 2951 | { |
| 2952 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, |
| 2953 | .procname = "gc_timeout", |
| 2954 | .data = &ip_rt_gc_timeout, |
| 2955 | .maxlen = sizeof(int), |
| 2956 | .mode = 0644, |
| 2957 | .proc_handler = &proc_dointvec_jiffies, |
| 2958 | .strategy = &sysctl_jiffies, |
| 2959 | }, |
| 2960 | { |
| 2961 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, |
| 2962 | .procname = "gc_interval", |
| 2963 | .data = &ip_rt_gc_interval, |
| 2964 | .maxlen = sizeof(int), |
| 2965 | .mode = 0644, |
| 2966 | .proc_handler = &proc_dointvec_jiffies, |
| 2967 | .strategy = &sysctl_jiffies, |
| 2968 | }, |
| 2969 | { |
| 2970 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, |
| 2971 | .procname = "redirect_load", |
| 2972 | .data = &ip_rt_redirect_load, |
| 2973 | .maxlen = sizeof(int), |
| 2974 | .mode = 0644, |
| 2975 | .proc_handler = &proc_dointvec, |
| 2976 | }, |
| 2977 | { |
| 2978 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, |
| 2979 | .procname = "redirect_number", |
| 2980 | .data = &ip_rt_redirect_number, |
| 2981 | .maxlen = sizeof(int), |
| 2982 | .mode = 0644, |
| 2983 | .proc_handler = &proc_dointvec, |
| 2984 | }, |
| 2985 | { |
| 2986 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, |
| 2987 | .procname = "redirect_silence", |
| 2988 | .data = &ip_rt_redirect_silence, |
| 2989 | .maxlen = sizeof(int), |
| 2990 | .mode = 0644, |
| 2991 | .proc_handler = &proc_dointvec, |
| 2992 | }, |
| 2993 | { |
| 2994 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, |
| 2995 | .procname = "error_cost", |
| 2996 | .data = &ip_rt_error_cost, |
| 2997 | .maxlen = sizeof(int), |
| 2998 | .mode = 0644, |
| 2999 | .proc_handler = &proc_dointvec, |
| 3000 | }, |
| 3001 | { |
| 3002 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, |
| 3003 | .procname = "error_burst", |
| 3004 | .data = &ip_rt_error_burst, |
| 3005 | .maxlen = sizeof(int), |
| 3006 | .mode = 0644, |
| 3007 | .proc_handler = &proc_dointvec, |
| 3008 | }, |
| 3009 | { |
| 3010 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, |
| 3011 | .procname = "gc_elasticity", |
| 3012 | .data = &ip_rt_gc_elasticity, |
| 3013 | .maxlen = sizeof(int), |
| 3014 | .mode = 0644, |
| 3015 | .proc_handler = &proc_dointvec, |
| 3016 | }, |
| 3017 | { |
| 3018 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, |
| 3019 | .procname = "mtu_expires", |
| 3020 | .data = &ip_rt_mtu_expires, |
| 3021 | .maxlen = sizeof(int), |
| 3022 | .mode = 0644, |
| 3023 | .proc_handler = &proc_dointvec_jiffies, |
| 3024 | .strategy = &sysctl_jiffies, |
| 3025 | }, |
| 3026 | { |
| 3027 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, |
| 3028 | .procname = "min_pmtu", |
| 3029 | .data = &ip_rt_min_pmtu, |
| 3030 | .maxlen = sizeof(int), |
| 3031 | .mode = 0644, |
| 3032 | .proc_handler = &proc_dointvec, |
| 3033 | }, |
| 3034 | { |
| 3035 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, |
| 3036 | .procname = "min_adv_mss", |
| 3037 | .data = &ip_rt_min_advmss, |
| 3038 | .maxlen = sizeof(int), |
| 3039 | .mode = 0644, |
| 3040 | .proc_handler = &proc_dointvec, |
| 3041 | }, |
| 3042 | { |
| 3043 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, |
| 3044 | .procname = "secret_interval", |
| 3045 | .data = &ip_rt_secret_interval, |
| 3046 | .maxlen = sizeof(int), |
| 3047 | .mode = 0644, |
| 3048 | .proc_handler = &proc_dointvec_jiffies, |
| 3049 | .strategy = &sysctl_jiffies, |
| 3050 | }, |
| 3051 | { .ctl_name = 0 } |
| 3052 | }; |
| 3053 | #endif |
| 3054 | |
| 3055 | #ifdef CONFIG_NET_CLS_ROUTE |
| 3056 | struct ip_rt_acct *ip_rt_acct; |
| 3057 | |
| 3058 | /* This code sucks. But you should have seen it before! --RR */ |
| 3059 | |
| 3060 | /* IP route accounting ptr for this logical cpu number. */ |
| 3061 | #define IP_RT_ACCT_CPU(i) (ip_rt_acct + i * 256) |
| 3062 | |
| 3063 | #ifdef CONFIG_PROC_FS |
| 3064 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, |
| 3065 | int length, int *eof, void *data) |
| 3066 | { |
| 3067 | unsigned int i; |
| 3068 | |
| 3069 | if ((offset & 3) || (length & 3)) |
| 3070 | return -EIO; |
| 3071 | |
| 3072 | if (offset >= sizeof(struct ip_rt_acct) * 256) { |
| 3073 | *eof = 1; |
| 3074 | return 0; |
| 3075 | } |
| 3076 | |
| 3077 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { |
| 3078 | length = sizeof(struct ip_rt_acct) * 256 - offset; |
| 3079 | *eof = 1; |
| 3080 | } |
| 3081 | |
| 3082 | offset /= sizeof(u32); |
| 3083 | |
| 3084 | if (length > 0) { |
| 3085 | u32 *src = ((u32 *) IP_RT_ACCT_CPU(0)) + offset; |
| 3086 | u32 *dst = (u32 *) buffer; |
| 3087 | |
| 3088 | /* Copy first cpu. */ |
| 3089 | *start = buffer; |
| 3090 | memcpy(dst, src, length); |
| 3091 | |
| 3092 | /* Add the other cpus in, one int at a time */ |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 3093 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3094 | unsigned int j; |
| 3095 | |
| 3096 | src = ((u32 *) IP_RT_ACCT_CPU(i)) + offset; |
| 3097 | |
| 3098 | for (j = 0; j < length/4; j++) |
| 3099 | dst[j] += src[j]; |
| 3100 | } |
| 3101 | } |
| 3102 | return length; |
| 3103 | } |
| 3104 | #endif /* CONFIG_PROC_FS */ |
| 3105 | #endif /* CONFIG_NET_CLS_ROUTE */ |
| 3106 | |
| 3107 | static __initdata unsigned long rhash_entries; |
| 3108 | static int __init set_rhash_entries(char *str) |
| 3109 | { |
| 3110 | if (!str) |
| 3111 | return 0; |
| 3112 | rhash_entries = simple_strtoul(str, &str, 0); |
| 3113 | return 1; |
| 3114 | } |
| 3115 | __setup("rhash_entries=", set_rhash_entries); |
| 3116 | |
| 3117 | int __init ip_rt_init(void) |
| 3118 | { |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3119 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3120 | |
| 3121 | rt_hash_rnd = (int) ((num_physpages ^ (num_physpages>>8)) ^ |
| 3122 | (jiffies ^ (jiffies >> 7))); |
| 3123 | |
| 3124 | #ifdef CONFIG_NET_CLS_ROUTE |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3125 | { |
| 3126 | int order; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | for (order = 0; |
| 3128 | (PAGE_SIZE << order) < 256 * sizeof(struct ip_rt_acct) * NR_CPUS; order++) |
| 3129 | /* NOTHING */; |
| 3130 | ip_rt_acct = (struct ip_rt_acct *)__get_free_pages(GFP_KERNEL, order); |
| 3131 | if (!ip_rt_acct) |
| 3132 | panic("IP: failed to allocate ip_rt_acct\n"); |
| 3133 | memset(ip_rt_acct, 0, PAGE_SIZE << order); |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3134 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3135 | #endif |
| 3136 | |
Alexey Dobriyan | e5d679f | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 3137 | ipv4_dst_ops.kmem_cachep = |
| 3138 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, |
| 3139 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3140 | |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3141 | rt_hash_table = (struct rt_hash_bucket *) |
| 3142 | alloc_large_system_hash("IP route cache", |
| 3143 | sizeof(struct rt_hash_bucket), |
| 3144 | rhash_entries, |
| 3145 | (num_physpages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 3146 | 15 : 17, |
Kirill Korotaev | 8d1502d | 2006-08-07 20:44:22 -0700 | [diff] [blame] | 3147 | 0, |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3148 | &rt_hash_log, |
| 3149 | &rt_hash_mask, |
| 3150 | 0); |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 3151 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
| 3152 | rt_hash_lock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3153 | |
| 3154 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); |
| 3155 | ip_rt_max_size = (rt_hash_mask + 1) * 16; |
| 3156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3157 | devinet_init(); |
| 3158 | ip_fib_init(); |
| 3159 | |
| 3160 | init_timer(&rt_flush_timer); |
| 3161 | rt_flush_timer.function = rt_run_flush; |
| 3162 | init_timer(&rt_periodic_timer); |
| 3163 | rt_periodic_timer.function = rt_check_expire; |
| 3164 | init_timer(&rt_secret_timer); |
| 3165 | rt_secret_timer.function = rt_secret_rebuild; |
| 3166 | |
| 3167 | /* All the timers, started at system startup tend |
| 3168 | to synchronize. Perturb it a bit. |
| 3169 | */ |
| 3170 | rt_periodic_timer.expires = jiffies + net_random() % ip_rt_gc_interval + |
| 3171 | ip_rt_gc_interval; |
| 3172 | add_timer(&rt_periodic_timer); |
| 3173 | |
| 3174 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + |
| 3175 | ip_rt_secret_interval; |
| 3176 | add_timer(&rt_secret_timer); |
| 3177 | |
| 3178 | #ifdef CONFIG_PROC_FS |
| 3179 | { |
| 3180 | struct proc_dir_entry *rtstat_pde = NULL; /* keep gcc happy */ |
| 3181 | if (!proc_net_fops_create("rt_cache", S_IRUGO, &rt_cache_seq_fops) || |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 3182 | !(rtstat_pde = create_proc_entry("rt_cache", S_IRUGO, |
| 3183 | proc_net_stat))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3184 | return -ENOMEM; |
| 3185 | } |
| 3186 | rtstat_pde->proc_fops = &rt_cpu_seq_fops; |
| 3187 | } |
| 3188 | #ifdef CONFIG_NET_CLS_ROUTE |
| 3189 | create_proc_read_entry("rt_acct", 0, proc_net, ip_rt_acct_read, NULL); |
| 3190 | #endif |
| 3191 | #endif |
| 3192 | #ifdef CONFIG_XFRM |
| 3193 | xfrm_init(); |
| 3194 | xfrm4_init(); |
| 3195 | #endif |
| 3196 | return rc; |
| 3197 | } |
| 3198 | |
| 3199 | EXPORT_SYMBOL(__ip_select_ident); |
| 3200 | EXPORT_SYMBOL(ip_route_input); |
| 3201 | EXPORT_SYMBOL(ip_route_output_key); |