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> |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 84 | #include <linux/workqueue.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 95 | #include <net/dst.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 96 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #include <net/protocol.h> |
| 98 | #include <net/ip.h> |
| 99 | #include <net/route.h> |
| 100 | #include <net/inetpeer.h> |
| 101 | #include <net/sock.h> |
| 102 | #include <net/ip_fib.h> |
| 103 | #include <net/arp.h> |
| 104 | #include <net/tcp.h> |
| 105 | #include <net/icmp.h> |
| 106 | #include <net/xfrm.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 107 | #include <net/netevent.h> |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 108 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #ifdef CONFIG_SYSCTL |
| 110 | #include <linux/sysctl.h> |
| 111 | #endif |
| 112 | |
| 113 | #define RT_FL_TOS(oldflp) \ |
| 114 | ((u32)(oldflp->fl4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) |
| 115 | |
| 116 | #define IP_MAX_MTU 0xFFF0 |
| 117 | |
| 118 | #define RT_GC_TIMEOUT (300*HZ) |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | #define RTprint(a...) printk(KERN_DEBUG a) |
| 136 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 137 | static void rt_worker_func(struct work_struct *work); |
| 138 | static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | static struct timer_list rt_secret_timer; |
| 140 | |
| 141 | /* |
| 142 | * Interface to generic destination cache. |
| 143 | */ |
| 144 | |
| 145 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); |
| 146 | static void ipv4_dst_destroy(struct dst_entry *dst); |
| 147 | static void ipv4_dst_ifdown(struct dst_entry *dst, |
| 148 | struct net_device *dev, int how); |
| 149 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
| 150 | static void ipv4_link_failure(struct sk_buff *skb); |
| 151 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 152 | static int rt_garbage_collect(struct dst_ops *ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | |
| 155 | static struct dst_ops ipv4_dst_ops = { |
| 156 | .family = AF_INET, |
| 157 | .protocol = __constant_htons(ETH_P_IP), |
| 158 | .gc = rt_garbage_collect, |
| 159 | .check = ipv4_dst_check, |
| 160 | .destroy = ipv4_dst_destroy, |
| 161 | .ifdown = ipv4_dst_ifdown, |
| 162 | .negative_advice = ipv4_negative_advice, |
| 163 | .link_failure = ipv4_link_failure, |
| 164 | .update_pmtu = ip_rt_update_pmtu, |
Herbert Xu | 862b82c | 2007-11-13 21:43:11 -0800 | [diff] [blame] | 165 | .local_out = ip_local_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | .entry_size = sizeof(struct rtable), |
Eric Dumazet | e242297 | 2008-01-30 20:07:45 -0800 | [diff] [blame] | 167 | .entries = ATOMIC_INIT(0), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | }; |
| 169 | |
| 170 | #define ECN_OR_COST(class) TC_PRIO_##class |
| 171 | |
Philippe De Muyter | 4839c52 | 2007-07-09 15:32:57 -0700 | [diff] [blame] | 172 | const __u8 ip_tos2prio[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | TC_PRIO_BESTEFFORT, |
| 174 | ECN_OR_COST(FILLER), |
| 175 | TC_PRIO_BESTEFFORT, |
| 176 | ECN_OR_COST(BESTEFFORT), |
| 177 | TC_PRIO_BULK, |
| 178 | ECN_OR_COST(BULK), |
| 179 | TC_PRIO_BULK, |
| 180 | ECN_OR_COST(BULK), |
| 181 | TC_PRIO_INTERACTIVE, |
| 182 | ECN_OR_COST(INTERACTIVE), |
| 183 | TC_PRIO_INTERACTIVE, |
| 184 | ECN_OR_COST(INTERACTIVE), |
| 185 | TC_PRIO_INTERACTIVE_BULK, |
| 186 | ECN_OR_COST(INTERACTIVE_BULK), |
| 187 | TC_PRIO_INTERACTIVE_BULK, |
| 188 | ECN_OR_COST(INTERACTIVE_BULK) |
| 189 | }; |
| 190 | |
| 191 | |
| 192 | /* |
| 193 | * Route cache. |
| 194 | */ |
| 195 | |
| 196 | /* The locking scheme is rather straight forward: |
| 197 | * |
| 198 | * 1) Read-Copy Update protects the buckets of the central route hash. |
| 199 | * 2) Only writers remove entries, and they hold the lock |
| 200 | * as they look at rtable reference counts. |
| 201 | * 3) Only readers acquire references to rtable entries, |
| 202 | * they do so with atomic increments and with the |
| 203 | * lock held. |
| 204 | */ |
| 205 | |
| 206 | struct rt_hash_bucket { |
| 207 | struct rtable *chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 208 | }; |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 209 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
| 210 | defined(CONFIG_PROVE_LOCKING) |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 211 | /* |
| 212 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks |
| 213 | * 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] | 214 | * (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] | 215 | */ |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 216 | #ifdef CONFIG_LOCKDEP |
| 217 | # define RT_HASH_LOCK_SZ 256 |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 218 | #else |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 219 | # if NR_CPUS >= 32 |
| 220 | # define RT_HASH_LOCK_SZ 4096 |
| 221 | # elif NR_CPUS >= 16 |
| 222 | # define RT_HASH_LOCK_SZ 2048 |
| 223 | # elif NR_CPUS >= 8 |
| 224 | # define RT_HASH_LOCK_SZ 1024 |
| 225 | # elif NR_CPUS >= 4 |
| 226 | # define RT_HASH_LOCK_SZ 512 |
| 227 | # else |
| 228 | # define RT_HASH_LOCK_SZ 256 |
| 229 | # endif |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 230 | #endif |
| 231 | |
| 232 | static spinlock_t *rt_hash_locks; |
| 233 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] |
Pavel Emelyanov | 1ff1cc2 | 2007-12-05 21:15:05 -0800 | [diff] [blame] | 234 | |
| 235 | static __init void rt_hash_lock_init(void) |
| 236 | { |
| 237 | int i; |
| 238 | |
| 239 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, |
| 240 | GFP_KERNEL); |
| 241 | if (!rt_hash_locks) |
| 242 | panic("IP: failed to allocate rt_hash_locks\n"); |
| 243 | |
| 244 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) |
| 245 | spin_lock_init(&rt_hash_locks[i]); |
| 246 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 247 | #else |
| 248 | # define rt_hash_lock_addr(slot) NULL |
Pavel Emelyanov | 1ff1cc2 | 2007-12-05 21:15:05 -0800 | [diff] [blame] | 249 | |
| 250 | static inline void rt_hash_lock_init(void) |
| 251 | { |
| 252 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 253 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | static struct rt_hash_bucket *rt_hash_table; |
| 256 | static unsigned rt_hash_mask; |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 257 | static unsigned int rt_hash_log; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 258 | static atomic_t rt_genid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 260 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
Andrew Morton | dbd2915 | 2006-01-17 21:58:01 -0800 | [diff] [blame] | 261 | #define RT_CACHE_STAT_INC(field) \ |
Paul Mackerras | bfe5d83 | 2006-06-25 05:47:14 -0700 | [diff] [blame] | 262 | (__raw_get_cpu_var(rt_cache_stat).field++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 264 | static unsigned int rt_hash_code(u32 daddr, u32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 266 | return jhash_2words(daddr, saddr, atomic_read(&rt_genid)) |
| 267 | & rt_hash_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } |
| 269 | |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 270 | #define rt_hash(daddr, saddr, idx) \ |
| 271 | rt_hash_code((__force u32)(__be32)(daddr),\ |
| 272 | (__force u32)(__be32)(saddr) ^ ((idx) << 5)) |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | #ifdef CONFIG_PROC_FS |
| 275 | struct rt_cache_iter_state { |
| 276 | int bucket; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 277 | int genid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | }; |
| 279 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 280 | static struct rtable *rt_cache_get_first(struct rt_cache_iter_state *st) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
| 282 | struct rtable *r = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { |
| 285 | rcu_read_lock_bh(); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 286 | r = rcu_dereference(rt_hash_table[st->bucket].chain); |
| 287 | while (r) { |
| 288 | if (r->rt_genid == st->genid) |
| 289 | return r; |
| 290 | r = rcu_dereference(r->u.dst.rt_next); |
| 291 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | rcu_read_unlock_bh(); |
| 293 | } |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 294 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Denis V. Lunev | 642d631 | 2008-02-28 20:50:33 -0800 | [diff] [blame^] | 297 | static struct rtable *__rt_cache_get_next(struct rt_cache_iter_state *st, |
| 298 | struct rtable *r) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 300 | r = r->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | while (!r) { |
| 302 | rcu_read_unlock_bh(); |
| 303 | if (--st->bucket < 0) |
| 304 | break; |
| 305 | rcu_read_lock_bh(); |
| 306 | r = rt_hash_table[st->bucket].chain; |
| 307 | } |
Eric Dumazet | 0bccead | 2008-01-10 03:55:57 -0800 | [diff] [blame] | 308 | return rcu_dereference(r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Denis V. Lunev | 642d631 | 2008-02-28 20:50:33 -0800 | [diff] [blame^] | 311 | static struct rtable *rt_cache_get_next(struct rt_cache_iter_state *st, |
| 312 | struct rtable *r) |
| 313 | { |
| 314 | while ((r = __rt_cache_get_next(st, r)) != NULL) { |
| 315 | if (r->rt_genid == st->genid) |
| 316 | break; |
| 317 | } |
| 318 | return r; |
| 319 | } |
| 320 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 321 | static struct rtable *rt_cache_get_idx(struct rt_cache_iter_state *st, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 323 | struct rtable *r = rt_cache_get_first(st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | if (r) |
Denis V. Lunev | 642d631 | 2008-02-28 20:50:33 -0800 | [diff] [blame^] | 326 | while (pos && (r = rt_cache_get_next(st, r))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | --pos; |
| 328 | return pos ? NULL : r; |
| 329 | } |
| 330 | |
| 331 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 332 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 333 | struct rt_cache_iter_state *st = seq->private; |
| 334 | |
| 335 | if (*pos) |
| 336 | return rt_cache_get_idx(st, *pos - 1); |
| 337 | st->genid = atomic_read(&rt_genid); |
| 338 | return SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 342 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 343 | struct rtable *r; |
| 344 | struct rt_cache_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | if (v == SEQ_START_TOKEN) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 347 | r = rt_cache_get_first(st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | else |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 349 | r = rt_cache_get_next(st, v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | ++*pos; |
| 351 | return r; |
| 352 | } |
| 353 | |
| 354 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 355 | { |
| 356 | if (v && v != SEQ_START_TOKEN) |
| 357 | rcu_read_unlock_bh(); |
| 358 | } |
| 359 | |
| 360 | static int rt_cache_seq_show(struct seq_file *seq, void *v) |
| 361 | { |
| 362 | if (v == SEQ_START_TOKEN) |
| 363 | seq_printf(seq, "%-127s\n", |
| 364 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" |
| 365 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" |
| 366 | "HHUptod\tSpecDst"); |
| 367 | else { |
| 368 | struct rtable *r = v; |
| 369 | char temp[256]; |
| 370 | |
| 371 | sprintf(temp, "%s\t%08lX\t%08lX\t%8X\t%d\t%u\t%d\t" |
| 372 | "%08lX\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X", |
| 373 | r->u.dst.dev ? r->u.dst.dev->name : "*", |
| 374 | (unsigned long)r->rt_dst, (unsigned long)r->rt_gateway, |
| 375 | r->rt_flags, atomic_read(&r->u.dst.__refcnt), |
| 376 | r->u.dst.__use, 0, (unsigned long)r->rt_src, |
| 377 | (dst_metric(&r->u.dst, RTAX_ADVMSS) ? |
| 378 | (int)dst_metric(&r->u.dst, RTAX_ADVMSS) + 40 : 0), |
| 379 | dst_metric(&r->u.dst, RTAX_WINDOW), |
| 380 | (int)((dst_metric(&r->u.dst, RTAX_RTT) >> 3) + |
| 381 | dst_metric(&r->u.dst, RTAX_RTTVAR)), |
| 382 | r->fl.fl4_tos, |
| 383 | r->u.dst.hh ? atomic_read(&r->u.dst.hh->hh_refcnt) : -1, |
| 384 | r->u.dst.hh ? (r->u.dst.hh->hh_output == |
| 385 | dev_queue_xmit) : 0, |
| 386 | r->rt_spec_dst); |
| 387 | seq_printf(seq, "%-127s\n", temp); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 388 | } |
| 389 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 392 | static const struct seq_operations rt_cache_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | .start = rt_cache_seq_start, |
| 394 | .next = rt_cache_seq_next, |
| 395 | .stop = rt_cache_seq_stop, |
| 396 | .show = rt_cache_seq_show, |
| 397 | }; |
| 398 | |
| 399 | static int rt_cache_seq_open(struct inode *inode, struct file *file) |
| 400 | { |
Pavel Emelyanov | cf7732e | 2007-10-10 02:29:29 -0700 | [diff] [blame] | 401 | return seq_open_private(file, &rt_cache_seq_ops, |
| 402 | sizeof(struct rt_cache_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
| 404 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 405 | static const struct file_operations rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | .owner = THIS_MODULE, |
| 407 | .open = rt_cache_seq_open, |
| 408 | .read = seq_read, |
| 409 | .llseek = seq_lseek, |
| 410 | .release = seq_release_private, |
| 411 | }; |
| 412 | |
| 413 | |
| 414 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 415 | { |
| 416 | int cpu; |
| 417 | |
| 418 | if (*pos == 0) |
| 419 | return SEQ_START_TOKEN; |
| 420 | |
| 421 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { |
| 422 | if (!cpu_possible(cpu)) |
| 423 | continue; |
| 424 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 425 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | } |
| 427 | return NULL; |
| 428 | } |
| 429 | |
| 430 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 431 | { |
| 432 | int cpu; |
| 433 | |
| 434 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { |
| 435 | if (!cpu_possible(cpu)) |
| 436 | continue; |
| 437 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 438 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | return NULL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) |
| 445 | { |
| 446 | |
| 447 | } |
| 448 | |
| 449 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) |
| 450 | { |
| 451 | struct rt_cache_stat *st = v; |
| 452 | |
| 453 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 454 | 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] | 455 | return 0; |
| 456 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
| 459 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", |
| 460 | atomic_read(&ipv4_dst_ops.entries), |
| 461 | st->in_hit, |
| 462 | st->in_slow_tot, |
| 463 | st->in_slow_mc, |
| 464 | st->in_no_route, |
| 465 | st->in_brd, |
| 466 | st->in_martian_dst, |
| 467 | st->in_martian_src, |
| 468 | |
| 469 | st->out_hit, |
| 470 | st->out_slow_tot, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 471 | st->out_slow_mc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | st->gc_total, |
| 474 | st->gc_ignored, |
| 475 | st->gc_goal_miss, |
| 476 | st->gc_dst_overflow, |
| 477 | st->in_hlist_search, |
| 478 | st->out_hlist_search |
| 479 | ); |
| 480 | return 0; |
| 481 | } |
| 482 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 483 | static const struct seq_operations rt_cpu_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | .start = rt_cpu_seq_start, |
| 485 | .next = rt_cpu_seq_next, |
| 486 | .stop = rt_cpu_seq_stop, |
| 487 | .show = rt_cpu_seq_show, |
| 488 | }; |
| 489 | |
| 490 | |
| 491 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) |
| 492 | { |
| 493 | return seq_open(file, &rt_cpu_seq_ops); |
| 494 | } |
| 495 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 496 | static const struct file_operations rt_cpu_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | .owner = THIS_MODULE, |
| 498 | .open = rt_cpu_seq_open, |
| 499 | .read = seq_read, |
| 500 | .llseek = seq_lseek, |
| 501 | .release = seq_release, |
| 502 | }; |
| 503 | |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 504 | #ifdef CONFIG_NET_CLS_ROUTE |
| 505 | static int ip_rt_acct_read(char *buffer, char **start, off_t offset, |
| 506 | int length, int *eof, void *data) |
| 507 | { |
| 508 | unsigned int i; |
| 509 | |
| 510 | if ((offset & 3) || (length & 3)) |
| 511 | return -EIO; |
| 512 | |
| 513 | if (offset >= sizeof(struct ip_rt_acct) * 256) { |
| 514 | *eof = 1; |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | if (offset + length >= sizeof(struct ip_rt_acct) * 256) { |
| 519 | length = sizeof(struct ip_rt_acct) * 256 - offset; |
| 520 | *eof = 1; |
| 521 | } |
| 522 | |
| 523 | offset /= sizeof(u32); |
| 524 | |
| 525 | if (length > 0) { |
| 526 | u32 *dst = (u32 *) buffer; |
| 527 | |
| 528 | *start = buffer; |
| 529 | memset(dst, 0, length); |
| 530 | |
| 531 | for_each_possible_cpu(i) { |
| 532 | unsigned int j; |
| 533 | u32 *src; |
| 534 | |
| 535 | src = ((u32 *) per_cpu_ptr(ip_rt_acct, i)) + offset; |
| 536 | for (j = 0; j < length/4; j++) |
| 537 | dst[j] += src[j]; |
| 538 | } |
| 539 | } |
| 540 | return length; |
| 541 | } |
| 542 | #endif |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 543 | |
| 544 | static __init int ip_rt_proc_init(struct net *net) |
| 545 | { |
| 546 | struct proc_dir_entry *pde; |
| 547 | |
| 548 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, |
| 549 | &rt_cache_seq_fops); |
| 550 | if (!pde) |
| 551 | goto err1; |
| 552 | |
Wang Chen | 7702072 | 2008-02-28 14:14:25 -0800 | [diff] [blame] | 553 | pde = proc_create("rt_cache", S_IRUGO, |
| 554 | net->proc_net_stat, &rt_cpu_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 555 | if (!pde) |
| 556 | goto err2; |
| 557 | |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 558 | #ifdef CONFIG_NET_CLS_ROUTE |
| 559 | pde = create_proc_read_entry("rt_acct", 0, net->proc_net, |
| 560 | ip_rt_acct_read, NULL); |
| 561 | if (!pde) |
| 562 | goto err3; |
| 563 | #endif |
| 564 | return 0; |
| 565 | |
| 566 | #ifdef CONFIG_NET_CLS_ROUTE |
| 567 | err3: |
| 568 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 569 | #endif |
| 570 | err2: |
| 571 | remove_proc_entry("rt_cache", net->proc_net); |
| 572 | err1: |
| 573 | return -ENOMEM; |
| 574 | } |
| 575 | #else |
| 576 | static inline int ip_rt_proc_init(struct net *net) |
| 577 | { |
| 578 | return 0; |
| 579 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | #endif /* CONFIG_PROC_FS */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | static __inline__ void rt_free(struct rtable *rt) |
| 583 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 585 | } |
| 586 | |
| 587 | static __inline__ void rt_drop(struct rtable *rt) |
| 588 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | ip_rt_put(rt); |
| 590 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
| 591 | } |
| 592 | |
| 593 | static __inline__ int rt_fast_clean(struct rtable *rth) |
| 594 | { |
| 595 | /* Kill broadcast/multicast entries very aggresively, if they |
| 596 | collide in hash table with more useful entries */ |
| 597 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 598 | rth->fl.iif && rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | static __inline__ int rt_valuable(struct rtable *rth) |
| 602 | { |
| 603 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || |
| 604 | rth->u.dst.expires; |
| 605 | } |
| 606 | |
| 607 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) |
| 608 | { |
| 609 | unsigned long age; |
| 610 | int ret = 0; |
| 611 | |
| 612 | if (atomic_read(&rth->u.dst.__refcnt)) |
| 613 | goto out; |
| 614 | |
| 615 | ret = 1; |
| 616 | if (rth->u.dst.expires && |
| 617 | time_after_eq(jiffies, rth->u.dst.expires)) |
| 618 | goto out; |
| 619 | |
| 620 | age = jiffies - rth->u.dst.lastuse; |
| 621 | ret = 0; |
| 622 | if ((age <= tmo1 && !rt_fast_clean(rth)) || |
| 623 | (age <= tmo2 && rt_valuable(rth))) |
| 624 | goto out; |
| 625 | ret = 1; |
| 626 | out: return ret; |
| 627 | } |
| 628 | |
| 629 | /* Bits of score are: |
| 630 | * 31: very valuable |
| 631 | * 30: not quite useless |
| 632 | * 29..0: usage counter |
| 633 | */ |
| 634 | static inline u32 rt_score(struct rtable *rt) |
| 635 | { |
| 636 | u32 score = jiffies - rt->u.dst.lastuse; |
| 637 | |
| 638 | score = ~score & ~(3<<30); |
| 639 | |
| 640 | if (rt_valuable(rt)) |
| 641 | score |= (1<<31); |
| 642 | |
| 643 | if (!rt->fl.iif || |
| 644 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) |
| 645 | score |= (1<<30); |
| 646 | |
| 647 | return score; |
| 648 | } |
| 649 | |
| 650 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
| 651 | { |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 652 | return ((__force u32)((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) | |
| 653 | (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr)) | |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 654 | (fl1->mark ^ fl2->mark) | |
David S. Miller | 8238b21 | 2006-10-12 00:49:15 -0700 | [diff] [blame] | 655 | (*(u16 *)&fl1->nl_u.ip4_u.tos ^ |
| 656 | *(u16 *)&fl2->nl_u.ip4_u.tos) | |
| 657 | (fl1->oif ^ fl2->oif) | |
| 658 | (fl1->iif ^ fl2->iif)) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 661 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
| 662 | { |
| 663 | return rt1->u.dst.dev->nd_net == rt2->u.dst.dev->nd_net; |
| 664 | } |
| 665 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 666 | /* |
| 667 | * Perform a full scan of hash table and free all entries. |
| 668 | * Can be called by a softirq or a process. |
| 669 | * In the later case, we want to be reschedule if necessary |
| 670 | */ |
| 671 | static void rt_do_flush(int process_context) |
| 672 | { |
| 673 | unsigned int i; |
| 674 | struct rtable *rth, *next; |
| 675 | |
| 676 | for (i = 0; i <= rt_hash_mask; i++) { |
| 677 | if (process_context && need_resched()) |
| 678 | cond_resched(); |
| 679 | rth = rt_hash_table[i].chain; |
| 680 | if (!rth) |
| 681 | continue; |
| 682 | |
| 683 | spin_lock_bh(rt_hash_lock_addr(i)); |
| 684 | rth = rt_hash_table[i].chain; |
| 685 | rt_hash_table[i].chain = NULL; |
| 686 | spin_unlock_bh(rt_hash_lock_addr(i)); |
| 687 | |
| 688 | for (; rth; rth = next) { |
| 689 | next = rth->u.dst.rt_next; |
| 690 | rt_free(rth); |
| 691 | } |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | static void rt_check_expire(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | { |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 697 | static unsigned int rover; |
| 698 | unsigned int i = rover, goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | struct rtable *rth, **rthp; |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 700 | u64 mult; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 702 | mult = ((u64)ip_rt_gc_interval) << rt_hash_log; |
| 703 | if (ip_rt_gc_timeout > 1) |
| 704 | do_div(mult, ip_rt_gc_timeout); |
| 705 | goal = (unsigned int)mult; |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 706 | if (goal > rt_hash_mask) |
| 707 | goal = rt_hash_mask + 1; |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 708 | for (; goal > 0; goal--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | unsigned long tmo = ip_rt_gc_timeout; |
| 710 | |
| 711 | i = (i + 1) & rt_hash_mask; |
| 712 | rthp = &rt_hash_table[i].chain; |
| 713 | |
Eric Dumazet | d90bf5a | 2007-11-14 16:14:05 -0800 | [diff] [blame] | 714 | if (need_resched()) |
| 715 | cond_resched(); |
| 716 | |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 717 | if (*rthp == NULL) |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 718 | continue; |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 719 | spin_lock_bh(rt_hash_lock_addr(i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | while ((rth = *rthp) != NULL) { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 721 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
| 722 | *rthp = rth->u.dst.rt_next; |
| 723 | rt_free(rth); |
| 724 | continue; |
| 725 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (rth->u.dst.expires) { |
| 727 | /* Entry is expired even if it is in use */ |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 728 | if (time_before_eq(jiffies, rth->u.dst.expires)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | tmo >>= 1; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 730 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | continue; |
| 732 | } |
| 733 | } else if (!rt_may_expire(rth, tmo, ip_rt_gc_timeout)) { |
| 734 | tmo >>= 1; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 735 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | continue; |
| 737 | } |
| 738 | |
| 739 | /* Cleanup aged off entries. */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 740 | *rthp = rth->u.dst.rt_next; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 741 | rt_free(rth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 743 | spin_unlock_bh(rt_hash_lock_addr(i)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
| 745 | rover = i; |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 746 | } |
| 747 | |
| 748 | /* |
| 749 | * rt_worker_func() is run in process context. |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 750 | * we call rt_check_expire() to scan part of the hash table |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 751 | */ |
| 752 | static void rt_worker_func(struct work_struct *work) |
| 753 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 754 | rt_check_expire(); |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 755 | schedule_delayed_work(&expires_work, ip_rt_gc_interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 758 | /* |
| 759 | * Pertubation of rt_genid by a small quantity [1..256] |
| 760 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() |
| 761 | * many times (2^24) without giving recent rt_genid. |
| 762 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | */ |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 764 | static void rt_cache_invalidate(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 766 | unsigned char shuffle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 768 | get_random_bytes(&shuffle, sizeof(shuffle)); |
| 769 | atomic_add(shuffle + 1U, &rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 772 | /* |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 773 | * delay < 0 : invalidate cache (fast : entries will be deleted later) |
| 774 | * delay >= 0 : invalidate & flush cache (can be long) |
| 775 | */ |
| 776 | void rt_cache_flush(int delay) |
| 777 | { |
| 778 | rt_cache_invalidate(); |
| 779 | if (delay >= 0) |
| 780 | rt_do_flush(!in_softirq()); |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * We change rt_genid and let gc do the cleanup |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 785 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | static void rt_secret_rebuild(unsigned long dummy) |
| 787 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 788 | rt_cache_invalidate(); |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 789 | mod_timer(&rt_secret_timer, jiffies + ip_rt_secret_interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /* |
| 793 | Short description of GC goals. |
| 794 | |
| 795 | We want to build algorithm, which will keep routing cache |
| 796 | at some equilibrium point, when number of aged off entries |
| 797 | is kept approximately equal to newly generated ones. |
| 798 | |
| 799 | Current expiration strength is variable "expire". |
| 800 | We try to adjust it dynamically, so that if networking |
| 801 | is idle expires is large enough to keep enough of warm entries, |
| 802 | and when load increases it reduces to limit cache size. |
| 803 | */ |
| 804 | |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 805 | static int rt_garbage_collect(struct dst_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | { |
| 807 | static unsigned long expire = RT_GC_TIMEOUT; |
| 808 | static unsigned long last_gc; |
| 809 | static int rover; |
| 810 | static int equilibrium; |
| 811 | struct rtable *rth, **rthp; |
| 812 | unsigned long now = jiffies; |
| 813 | int goal; |
| 814 | |
| 815 | /* |
| 816 | * Garbage collection is pretty expensive, |
| 817 | * do not make it too frequently. |
| 818 | */ |
| 819 | |
| 820 | RT_CACHE_STAT_INC(gc_total); |
| 821 | |
| 822 | if (now - last_gc < ip_rt_gc_min_interval && |
| 823 | atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) { |
| 824 | RT_CACHE_STAT_INC(gc_ignored); |
| 825 | goto out; |
| 826 | } |
| 827 | |
| 828 | /* Calculate number of entries, which we want to expire now. */ |
| 829 | goal = atomic_read(&ipv4_dst_ops.entries) - |
| 830 | (ip_rt_gc_elasticity << rt_hash_log); |
| 831 | if (goal <= 0) { |
| 832 | if (equilibrium < ipv4_dst_ops.gc_thresh) |
| 833 | equilibrium = ipv4_dst_ops.gc_thresh; |
| 834 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
| 835 | if (goal > 0) { |
Eric Dumazet | b790ced | 2007-12-21 01:49:07 -0800 | [diff] [blame] | 836 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium; |
| 838 | } |
| 839 | } else { |
| 840 | /* We are in dangerous area. Try to reduce cache really |
| 841 | * aggressively. |
| 842 | */ |
Eric Dumazet | b790ced | 2007-12-21 01:49:07 -0800 | [diff] [blame] | 843 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal; |
| 845 | } |
| 846 | |
| 847 | if (now - last_gc >= ip_rt_gc_min_interval) |
| 848 | last_gc = now; |
| 849 | |
| 850 | if (goal <= 0) { |
| 851 | equilibrium += goal; |
| 852 | goto work_done; |
| 853 | } |
| 854 | |
| 855 | do { |
| 856 | int i, k; |
| 857 | |
| 858 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { |
| 859 | unsigned long tmo = expire; |
| 860 | |
| 861 | k = (k + 1) & rt_hash_mask; |
| 862 | rthp = &rt_hash_table[k].chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 863 | spin_lock_bh(rt_hash_lock_addr(k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | while ((rth = *rthp) != NULL) { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 865 | if (rth->rt_genid == atomic_read(&rt_genid) && |
| 866 | !rt_may_expire(rth, tmo, expire)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | tmo >>= 1; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 868 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | continue; |
| 870 | } |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 871 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | rt_free(rth); |
| 873 | goal--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 875 | spin_unlock_bh(rt_hash_lock_addr(k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | if (goal <= 0) |
| 877 | break; |
| 878 | } |
| 879 | rover = k; |
| 880 | |
| 881 | if (goal <= 0) |
| 882 | goto work_done; |
| 883 | |
| 884 | /* Goal is not achieved. We stop process if: |
| 885 | |
| 886 | - if expire reduced to zero. Otherwise, expire is halfed. |
| 887 | - if table is not full. |
| 888 | - if we are called from interrupt. |
| 889 | - jiffies check is just fallback/debug loop breaker. |
| 890 | We will not spin here for long time in any case. |
| 891 | */ |
| 892 | |
| 893 | RT_CACHE_STAT_INC(gc_goal_miss); |
| 894 | |
| 895 | if (expire == 0) |
| 896 | break; |
| 897 | |
| 898 | expire >>= 1; |
| 899 | #if RT_CACHE_DEBUG >= 2 |
| 900 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, |
| 901 | atomic_read(&ipv4_dst_ops.entries), goal, i); |
| 902 | #endif |
| 903 | |
| 904 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) |
| 905 | goto out; |
| 906 | } while (!in_softirq() && time_before_eq(jiffies, now)); |
| 907 | |
| 908 | if (atomic_read(&ipv4_dst_ops.entries) < ip_rt_max_size) |
| 909 | goto out; |
| 910 | if (net_ratelimit()) |
| 911 | printk(KERN_WARNING "dst cache overflow\n"); |
| 912 | RT_CACHE_STAT_INC(gc_dst_overflow); |
| 913 | return 1; |
| 914 | |
| 915 | work_done: |
| 916 | expire += ip_rt_gc_min_interval; |
| 917 | if (expire > ip_rt_gc_timeout || |
| 918 | atomic_read(&ipv4_dst_ops.entries) < ipv4_dst_ops.gc_thresh) |
| 919 | expire = ip_rt_gc_timeout; |
| 920 | #if RT_CACHE_DEBUG >= 2 |
| 921 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, |
| 922 | atomic_read(&ipv4_dst_ops.entries), goal, rover); |
| 923 | #endif |
| 924 | out: return 0; |
| 925 | } |
| 926 | |
| 927 | static int rt_intern_hash(unsigned hash, struct rtable *rt, struct rtable **rp) |
| 928 | { |
| 929 | struct rtable *rth, **rthp; |
| 930 | unsigned long now; |
| 931 | struct rtable *cand, **candp; |
| 932 | u32 min_score; |
| 933 | int chain_length; |
| 934 | int attempts = !in_softirq(); |
| 935 | |
| 936 | restart: |
| 937 | chain_length = 0; |
| 938 | min_score = ~(u32)0; |
| 939 | cand = NULL; |
| 940 | candp = NULL; |
| 941 | now = jiffies; |
| 942 | |
| 943 | rthp = &rt_hash_table[hash].chain; |
| 944 | |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 945 | spin_lock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | while ((rth = *rthp) != NULL) { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 947 | if (rth->rt_genid != atomic_read(&rt_genid)) { |
| 948 | *rthp = rth->u.dst.rt_next; |
| 949 | rt_free(rth); |
| 950 | continue; |
| 951 | } |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 952 | if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | /* Put it first */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 954 | *rthp = rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | /* |
| 956 | * Since lookup is lockfree, the deletion |
| 957 | * must be visible to another weakly ordered CPU before |
| 958 | * the insertion at the start of the hash chain. |
| 959 | */ |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 960 | rcu_assign_pointer(rth->u.dst.rt_next, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | rt_hash_table[hash].chain); |
| 962 | /* |
| 963 | * Since lookup is lockfree, the update writes |
| 964 | * must be ordered for consistency on SMP. |
| 965 | */ |
| 966 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); |
| 967 | |
Pavel Emelyanov | 03f49f3 | 2007-11-10 21:28:34 -0800 | [diff] [blame] | 968 | dst_use(&rth->u.dst, now); |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 969 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | rt_drop(rt); |
| 972 | *rp = rth; |
| 973 | return 0; |
| 974 | } |
| 975 | |
| 976 | if (!atomic_read(&rth->u.dst.__refcnt)) { |
| 977 | u32 score = rt_score(rth); |
| 978 | |
| 979 | if (score <= min_score) { |
| 980 | cand = rth; |
| 981 | candp = rthp; |
| 982 | min_score = score; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | chain_length++; |
| 987 | |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 988 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | } |
| 990 | |
| 991 | if (cand) { |
| 992 | /* ip_rt_gc_elasticity used to be average length of chain |
| 993 | * length, when exceeded gc becomes really aggressive. |
| 994 | * |
| 995 | * The second limit is less certain. At the moment it allows |
| 996 | * only 2 entries per bucket. We will see. |
| 997 | */ |
| 998 | if (chain_length > ip_rt_gc_elasticity) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 999 | *candp = cand->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | rt_free(cand); |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | /* Try to bind route to arp only if it is output |
| 1005 | route or unicast forwarding path. |
| 1006 | */ |
| 1007 | if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) { |
| 1008 | int err = arp_bind_neighbour(&rt->u.dst); |
| 1009 | if (err) { |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1010 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
| 1012 | if (err != -ENOBUFS) { |
| 1013 | rt_drop(rt); |
| 1014 | return err; |
| 1015 | } |
| 1016 | |
| 1017 | /* Neighbour tables are full and nothing |
| 1018 | can be released. Try to shrink route cache, |
| 1019 | it is most likely it holds some neighbour records. |
| 1020 | */ |
| 1021 | if (attempts-- > 0) { |
| 1022 | int saved_elasticity = ip_rt_gc_elasticity; |
| 1023 | int saved_int = ip_rt_gc_min_interval; |
| 1024 | ip_rt_gc_elasticity = 1; |
| 1025 | ip_rt_gc_min_interval = 0; |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 1026 | rt_garbage_collect(&ipv4_dst_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | ip_rt_gc_min_interval = saved_int; |
| 1028 | ip_rt_gc_elasticity = saved_elasticity; |
| 1029 | goto restart; |
| 1030 | } |
| 1031 | |
| 1032 | if (net_ratelimit()) |
| 1033 | printk(KERN_WARNING "Neighbour table overflow.\n"); |
| 1034 | rt_drop(rt); |
| 1035 | return -ENOBUFS; |
| 1036 | } |
| 1037 | } |
| 1038 | |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1039 | rt->u.dst.rt_next = rt_hash_table[hash].chain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | #if RT_CACHE_DEBUG >= 2 |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1041 | if (rt->u.dst.rt_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | struct rtable *trt; |
| 1043 | printk(KERN_DEBUG "rt_cache @%02x: %u.%u.%u.%u", hash, |
| 1044 | NIPQUAD(rt->rt_dst)); |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1045 | 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] | 1046 | printk(" . %u.%u.%u.%u", NIPQUAD(trt->rt_dst)); |
| 1047 | printk("\n"); |
| 1048 | } |
| 1049 | #endif |
| 1050 | rt_hash_table[hash].chain = rt; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1051 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | *rp = rt; |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
| 1056 | void rt_bind_peer(struct rtable *rt, int create) |
| 1057 | { |
| 1058 | static DEFINE_SPINLOCK(rt_peer_lock); |
| 1059 | struct inet_peer *peer; |
| 1060 | |
| 1061 | peer = inet_getpeer(rt->rt_dst, create); |
| 1062 | |
| 1063 | spin_lock_bh(&rt_peer_lock); |
| 1064 | if (rt->peer == NULL) { |
| 1065 | rt->peer = peer; |
| 1066 | peer = NULL; |
| 1067 | } |
| 1068 | spin_unlock_bh(&rt_peer_lock); |
| 1069 | if (peer) |
| 1070 | inet_putpeer(peer); |
| 1071 | } |
| 1072 | |
| 1073 | /* |
| 1074 | * Peer allocation may fail only in serious out-of-memory conditions. However |
| 1075 | * we still can generate some output. |
| 1076 | * Random ID selection looks a bit dangerous because we have no chances to |
| 1077 | * select ID being unique in a reasonable period of time. |
| 1078 | * But broken packet identifier may be better than no packet at all. |
| 1079 | */ |
| 1080 | static void ip_select_fb_ident(struct iphdr *iph) |
| 1081 | { |
| 1082 | static DEFINE_SPINLOCK(ip_fb_id_lock); |
| 1083 | static u32 ip_fallback_id; |
| 1084 | u32 salt; |
| 1085 | |
| 1086 | spin_lock_bh(&ip_fb_id_lock); |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1087 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | iph->id = htons(salt & 0xFFFF); |
| 1089 | ip_fallback_id = salt; |
| 1090 | spin_unlock_bh(&ip_fb_id_lock); |
| 1091 | } |
| 1092 | |
| 1093 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) |
| 1094 | { |
| 1095 | struct rtable *rt = (struct rtable *) dst; |
| 1096 | |
| 1097 | if (rt) { |
| 1098 | if (rt->peer == NULL) |
| 1099 | rt_bind_peer(rt, 1); |
| 1100 | |
| 1101 | /* If peer is attached to destination, it is never detached, |
| 1102 | so that we need not to grab a lock to dereference it. |
| 1103 | */ |
| 1104 | if (rt->peer) { |
| 1105 | iph->id = htons(inet_getid(rt->peer, more)); |
| 1106 | return; |
| 1107 | } |
| 1108 | } else |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1109 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
Stephen Hemminger | 9c2b332 | 2005-04-19 22:39:42 -0700 | [diff] [blame] | 1110 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
| 1112 | ip_select_fb_ident(iph); |
| 1113 | } |
| 1114 | |
| 1115 | static void rt_del(unsigned hash, struct rtable *rt) |
| 1116 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1117 | struct rtable **rthp, *aux; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1119 | rthp = &rt_hash_table[hash].chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1120 | spin_lock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | ip_rt_put(rt); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1122 | while ((aux = *rthp) != NULL) { |
| 1123 | if (aux == rt || (aux->rt_genid != atomic_read(&rt_genid))) { |
| 1124 | *rthp = aux->u.dst.rt_next; |
| 1125 | rt_free(aux); |
| 1126 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | } |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1128 | rthp = &aux->u.dst.rt_next; |
| 1129 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1130 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | } |
| 1132 | |
Al Viro | f765522 | 2006-09-26 21:25:43 -0700 | [diff] [blame] | 1133 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
| 1134 | __be32 saddr, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | { |
| 1136 | int i, k; |
| 1137 | struct in_device *in_dev = in_dev_get(dev); |
| 1138 | struct rtable *rth, **rthp; |
Al Viro | f765522 | 2006-09-26 21:25:43 -0700 | [diff] [blame] | 1139 | __be32 skeys[2] = { saddr, 0 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | int ikeys[2] = { dev->ifindex, 0 }; |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1141 | struct netevent_redirect netevent; |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 1142 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (!in_dev) |
| 1145 | return; |
| 1146 | |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 1147 | net = dev->nd_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1149 | || ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1150 | || ipv4_is_zeronet(new_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | goto reject_redirect; |
| 1152 | |
| 1153 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
| 1154 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) |
| 1155 | goto reject_redirect; |
| 1156 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) |
| 1157 | goto reject_redirect; |
| 1158 | } else { |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 1159 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | goto reject_redirect; |
| 1161 | } |
| 1162 | |
| 1163 | for (i = 0; i < 2; i++) { |
| 1164 | for (k = 0; k < 2; k++) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1165 | unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | rthp=&rt_hash_table[hash].chain; |
| 1168 | |
| 1169 | rcu_read_lock(); |
| 1170 | while ((rth = rcu_dereference(*rthp)) != NULL) { |
| 1171 | struct rtable *rt; |
| 1172 | |
| 1173 | if (rth->fl.fl4_dst != daddr || |
| 1174 | rth->fl.fl4_src != skeys[i] || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | rth->fl.oif != ikeys[k] || |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1176 | rth->fl.iif != 0 || |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 1177 | rth->rt_genid != atomic_read(&rt_genid) || |
| 1178 | rth->u.dst.dev->nd_net != net) { |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1179 | rthp = &rth->u.dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | continue; |
| 1181 | } |
| 1182 | |
| 1183 | if (rth->rt_dst != daddr || |
| 1184 | rth->rt_src != saddr || |
| 1185 | rth->u.dst.error || |
| 1186 | rth->rt_gateway != old_gw || |
| 1187 | rth->u.dst.dev != dev) |
| 1188 | break; |
| 1189 | |
| 1190 | dst_hold(&rth->u.dst); |
| 1191 | rcu_read_unlock(); |
| 1192 | |
| 1193 | rt = dst_alloc(&ipv4_dst_ops); |
| 1194 | if (rt == NULL) { |
| 1195 | ip_rt_put(rth); |
| 1196 | in_dev_put(in_dev); |
| 1197 | return; |
| 1198 | } |
| 1199 | |
| 1200 | /* Copy all the information. */ |
| 1201 | *rt = *rth; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1202 | INIT_RCU_HEAD(&rt->u.dst.rcu_head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | rt->u.dst.__use = 1; |
| 1204 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 1205 | rt->u.dst.child = NULL; |
| 1206 | if (rt->u.dst.dev) |
| 1207 | dev_hold(rt->u.dst.dev); |
| 1208 | if (rt->idev) |
| 1209 | in_dev_hold(rt->idev); |
| 1210 | rt->u.dst.obsolete = 0; |
| 1211 | rt->u.dst.lastuse = jiffies; |
| 1212 | rt->u.dst.path = &rt->u.dst; |
| 1213 | rt->u.dst.neighbour = NULL; |
| 1214 | rt->u.dst.hh = NULL; |
| 1215 | rt->u.dst.xfrm = NULL; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1216 | rt->rt_genid = atomic_read(&rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | rt->rt_flags |= RTCF_REDIRECTED; |
| 1218 | |
| 1219 | /* Gateway is different ... */ |
| 1220 | rt->rt_gateway = new_gw; |
| 1221 | |
| 1222 | /* Redirect received -> path was valid */ |
| 1223 | dst_confirm(&rth->u.dst); |
| 1224 | |
| 1225 | if (rt->peer) |
| 1226 | atomic_inc(&rt->peer->refcnt); |
| 1227 | |
| 1228 | if (arp_bind_neighbour(&rt->u.dst) || |
| 1229 | !(rt->u.dst.neighbour->nud_state & |
| 1230 | NUD_VALID)) { |
| 1231 | if (rt->u.dst.neighbour) |
| 1232 | neigh_event_send(rt->u.dst.neighbour, NULL); |
| 1233 | ip_rt_put(rth); |
| 1234 | rt_drop(rt); |
| 1235 | goto do_next; |
| 1236 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1237 | |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1238 | netevent.old = &rth->u.dst; |
| 1239 | netevent.new = &rt->u.dst; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1240 | call_netevent_notifiers(NETEVENT_REDIRECT, |
| 1241 | &netevent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
| 1243 | rt_del(hash, rth); |
| 1244 | if (!rt_intern_hash(hash, rt, &rt)) |
| 1245 | ip_rt_put(rt); |
| 1246 | goto do_next; |
| 1247 | } |
| 1248 | rcu_read_unlock(); |
| 1249 | do_next: |
| 1250 | ; |
| 1251 | } |
| 1252 | } |
| 1253 | in_dev_put(in_dev); |
| 1254 | return; |
| 1255 | |
| 1256 | reject_redirect: |
| 1257 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1258 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) |
| 1259 | printk(KERN_INFO "Redirect from %u.%u.%u.%u on %s about " |
| 1260 | "%u.%u.%u.%u ignored.\n" |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 1261 | " Advised path = %u.%u.%u.%u -> %u.%u.%u.%u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | NIPQUAD(old_gw), dev->name, NIPQUAD(new_gw), |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 1263 | NIPQUAD(saddr), NIPQUAD(daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | #endif |
| 1265 | in_dev_put(in_dev); |
| 1266 | } |
| 1267 | |
| 1268 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
| 1269 | { |
| 1270 | struct rtable *rt = (struct rtable*)dst; |
| 1271 | struct dst_entry *ret = dst; |
| 1272 | |
| 1273 | if (rt) { |
| 1274 | if (dst->obsolete) { |
| 1275 | ip_rt_put(rt); |
| 1276 | ret = NULL; |
| 1277 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
| 1278 | rt->u.dst.expires) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1279 | unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src, |
| 1280 | rt->fl.oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | #if RT_CACHE_DEBUG >= 1 |
Denis V. Lunev | 56c99d0 | 2007-12-06 02:19:07 -0800 | [diff] [blame] | 1282 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | "%u.%u.%u.%u/%02x dropped\n", |
| 1284 | NIPQUAD(rt->rt_dst), rt->fl.fl4_tos); |
| 1285 | #endif |
| 1286 | rt_del(hash, rt); |
| 1287 | ret = NULL; |
| 1288 | } |
| 1289 | } |
| 1290 | return ret; |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * Algorithm: |
| 1295 | * 1. The first ip_rt_redirect_number redirects are sent |
| 1296 | * with exponential backoff, then we stop sending them at all, |
| 1297 | * assuming that the host ignores our redirects. |
| 1298 | * 2. If we did not see packets requiring redirects |
| 1299 | * during ip_rt_redirect_silence, we assume that the host |
| 1300 | * forgot redirected route and start to send redirects again. |
| 1301 | * |
| 1302 | * This algorithm is much cheaper and more intelligent than dumb load limiting |
| 1303 | * in icmp.c. |
| 1304 | * |
| 1305 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) |
| 1306 | * and "frag. need" (breaks PMTU discovery) in icmp.c. |
| 1307 | */ |
| 1308 | |
| 1309 | void ip_rt_send_redirect(struct sk_buff *skb) |
| 1310 | { |
| 1311 | struct rtable *rt = (struct rtable*)skb->dst; |
| 1312 | struct in_device *in_dev = in_dev_get(rt->u.dst.dev); |
| 1313 | |
| 1314 | if (!in_dev) |
| 1315 | return; |
| 1316 | |
| 1317 | if (!IN_DEV_TX_REDIRECTS(in_dev)) |
| 1318 | goto out; |
| 1319 | |
| 1320 | /* No redirected packets during ip_rt_redirect_silence; |
| 1321 | * reset the algorithm. |
| 1322 | */ |
| 1323 | if (time_after(jiffies, rt->u.dst.rate_last + ip_rt_redirect_silence)) |
| 1324 | rt->u.dst.rate_tokens = 0; |
| 1325 | |
| 1326 | /* Too many ignored redirects; do not send anything |
| 1327 | * set u.dst.rate_last to the last seen redirected packet. |
| 1328 | */ |
| 1329 | if (rt->u.dst.rate_tokens >= ip_rt_redirect_number) { |
| 1330 | rt->u.dst.rate_last = jiffies; |
| 1331 | goto out; |
| 1332 | } |
| 1333 | |
| 1334 | /* Check for load limit; set rate_last to the latest sent |
| 1335 | * redirect. |
| 1336 | */ |
Li Yewang | 14fb8a7 | 2006-12-18 00:26:35 -0800 | [diff] [blame] | 1337 | if (rt->u.dst.rate_tokens == 0 || |
| 1338 | time_after(jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | (rt->u.dst.rate_last + |
| 1340 | (ip_rt_redirect_load << rt->u.dst.rate_tokens)))) { |
| 1341 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
| 1342 | rt->u.dst.rate_last = jiffies; |
| 1343 | ++rt->u.dst.rate_tokens; |
| 1344 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1345 | if (IN_DEV_LOG_MARTIANS(in_dev) && |
| 1346 | rt->u.dst.rate_tokens == ip_rt_redirect_number && |
| 1347 | net_ratelimit()) |
| 1348 | printk(KERN_WARNING "host %u.%u.%u.%u/if%d ignores " |
| 1349 | "redirects for %u.%u.%u.%u to %u.%u.%u.%u.\n", |
| 1350 | NIPQUAD(rt->rt_src), rt->rt_iif, |
| 1351 | NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_gateway)); |
| 1352 | #endif |
| 1353 | } |
| 1354 | out: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1355 | in_dev_put(in_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | } |
| 1357 | |
| 1358 | static int ip_error(struct sk_buff *skb) |
| 1359 | { |
| 1360 | struct rtable *rt = (struct rtable*)skb->dst; |
| 1361 | unsigned long now; |
| 1362 | int code; |
| 1363 | |
| 1364 | switch (rt->u.dst.error) { |
| 1365 | case EINVAL: |
| 1366 | default: |
| 1367 | goto out; |
| 1368 | case EHOSTUNREACH: |
| 1369 | code = ICMP_HOST_UNREACH; |
| 1370 | break; |
| 1371 | case ENETUNREACH: |
| 1372 | code = ICMP_NET_UNREACH; |
Mitsuru Chinen | 7f53878 | 2007-12-07 01:07:24 -0800 | [diff] [blame] | 1373 | IP_INC_STATS_BH(IPSTATS_MIB_INNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | break; |
| 1375 | case EACCES: |
| 1376 | code = ICMP_PKT_FILTERED; |
| 1377 | break; |
| 1378 | } |
| 1379 | |
| 1380 | now = jiffies; |
| 1381 | rt->u.dst.rate_tokens += now - rt->u.dst.rate_last; |
| 1382 | if (rt->u.dst.rate_tokens > ip_rt_error_burst) |
| 1383 | rt->u.dst.rate_tokens = ip_rt_error_burst; |
| 1384 | rt->u.dst.rate_last = now; |
| 1385 | if (rt->u.dst.rate_tokens >= ip_rt_error_cost) { |
| 1386 | rt->u.dst.rate_tokens -= ip_rt_error_cost; |
| 1387 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); |
| 1388 | } |
| 1389 | |
| 1390 | out: kfree_skb(skb); |
| 1391 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
| 1394 | /* |
| 1395 | * The last two values are not from the RFC but |
| 1396 | * are needed for AMPRnet AX.25 paths. |
| 1397 | */ |
| 1398 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1399 | static const unsigned short mtu_plateau[] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
| 1401 | |
| 1402 | static __inline__ unsigned short guess_mtu(unsigned short old_mtu) |
| 1403 | { |
| 1404 | int i; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
| 1407 | if (old_mtu > mtu_plateau[i]) |
| 1408 | return mtu_plateau[i]; |
| 1409 | return 68; |
| 1410 | } |
| 1411 | |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 1412 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
| 1413 | unsigned short new_mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | { |
| 1415 | int i; |
| 1416 | unsigned short old_mtu = ntohs(iph->tot_len); |
| 1417 | struct rtable *rth; |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1418 | __be32 skeys[2] = { iph->saddr, 0, }; |
| 1419 | __be32 daddr = iph->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | unsigned short est_mtu = 0; |
| 1421 | |
| 1422 | if (ipv4_config.no_pmtu_disc) |
| 1423 | return 0; |
| 1424 | |
| 1425 | for (i = 0; i < 2; i++) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1426 | unsigned hash = rt_hash(daddr, skeys[i], 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
| 1428 | rcu_read_lock(); |
| 1429 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 1430 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | if (rth->fl.fl4_dst == daddr && |
| 1432 | rth->fl.fl4_src == skeys[i] && |
| 1433 | rth->rt_dst == daddr && |
| 1434 | rth->rt_src == iph->saddr && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | rth->fl.iif == 0 && |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 1436 | !(dst_metric_locked(&rth->u.dst, RTAX_MTU)) && |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1437 | rth->u.dst.dev->nd_net == net && |
| 1438 | rth->rt_genid == atomic_read(&rt_genid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | unsigned short mtu = new_mtu; |
| 1440 | |
| 1441 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
| 1442 | |
| 1443 | /* BSD 4.2 compatibility hack :-( */ |
| 1444 | if (mtu == 0 && |
| 1445 | old_mtu >= rth->u.dst.metrics[RTAX_MTU-1] && |
| 1446 | old_mtu >= 68 + (iph->ihl << 2)) |
| 1447 | old_mtu -= iph->ihl << 2; |
| 1448 | |
| 1449 | mtu = guess_mtu(old_mtu); |
| 1450 | } |
| 1451 | if (mtu <= rth->u.dst.metrics[RTAX_MTU-1]) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1452 | if (mtu < rth->u.dst.metrics[RTAX_MTU-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | dst_confirm(&rth->u.dst); |
| 1454 | if (mtu < ip_rt_min_pmtu) { |
| 1455 | mtu = ip_rt_min_pmtu; |
| 1456 | rth->u.dst.metrics[RTAX_LOCK-1] |= |
| 1457 | (1 << RTAX_MTU); |
| 1458 | } |
| 1459 | rth->u.dst.metrics[RTAX_MTU-1] = mtu; |
| 1460 | dst_set_expires(&rth->u.dst, |
| 1461 | ip_rt_mtu_expires); |
| 1462 | } |
| 1463 | est_mtu = mtu; |
| 1464 | } |
| 1465 | } |
| 1466 | } |
| 1467 | rcu_read_unlock(); |
| 1468 | } |
| 1469 | return est_mtu ? : new_mtu; |
| 1470 | } |
| 1471 | |
| 1472 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 1473 | { |
| 1474 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= 68 && |
| 1475 | !(dst_metric_locked(dst, RTAX_MTU))) { |
| 1476 | if (mtu < ip_rt_min_pmtu) { |
| 1477 | mtu = ip_rt_min_pmtu; |
| 1478 | dst->metrics[RTAX_LOCK-1] |= (1 << RTAX_MTU); |
| 1479 | } |
| 1480 | dst->metrics[RTAX_MTU-1] = mtu; |
| 1481 | dst_set_expires(dst, ip_rt_mtu_expires); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1482 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | } |
| 1484 | } |
| 1485 | |
| 1486 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
| 1487 | { |
| 1488 | return NULL; |
| 1489 | } |
| 1490 | |
| 1491 | static void ipv4_dst_destroy(struct dst_entry *dst) |
| 1492 | { |
| 1493 | struct rtable *rt = (struct rtable *) dst; |
| 1494 | struct inet_peer *peer = rt->peer; |
| 1495 | struct in_device *idev = rt->idev; |
| 1496 | |
| 1497 | if (peer) { |
| 1498 | rt->peer = NULL; |
| 1499 | inet_putpeer(peer); |
| 1500 | } |
| 1501 | |
| 1502 | if (idev) { |
| 1503 | rt->idev = NULL; |
| 1504 | in_dev_put(idev); |
| 1505 | } |
| 1506 | } |
| 1507 | |
| 1508 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 1509 | int how) |
| 1510 | { |
| 1511 | struct rtable *rt = (struct rtable *) dst; |
| 1512 | struct in_device *idev = rt->idev; |
Denis V. Lunev | 5a3e55d | 2007-12-07 00:38:10 -0800 | [diff] [blame] | 1513 | if (dev != dev->nd_net->loopback_dev && idev && idev->dev == dev) { |
| 1514 | struct in_device *loopback_idev = |
| 1515 | in_dev_get(dev->nd_net->loopback_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | if (loopback_idev) { |
| 1517 | rt->idev = loopback_idev; |
| 1518 | in_dev_put(idev); |
| 1519 | } |
| 1520 | } |
| 1521 | } |
| 1522 | |
| 1523 | static void ipv4_link_failure(struct sk_buff *skb) |
| 1524 | { |
| 1525 | struct rtable *rt; |
| 1526 | |
| 1527 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| 1528 | |
| 1529 | rt = (struct rtable *) skb->dst; |
| 1530 | if (rt) |
| 1531 | dst_set_expires(&rt->u.dst, 0); |
| 1532 | } |
| 1533 | |
| 1534 | static int ip_rt_bug(struct sk_buff *skb) |
| 1535 | { |
| 1536 | printk(KERN_DEBUG "ip_rt_bug: %u.%u.%u.%u -> %u.%u.%u.%u, %s\n", |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1537 | NIPQUAD(ip_hdr(skb)->saddr), NIPQUAD(ip_hdr(skb)->daddr), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | skb->dev ? skb->dev->name : "?"); |
| 1539 | kfree_skb(skb); |
| 1540 | return 0; |
| 1541 | } |
| 1542 | |
| 1543 | /* |
| 1544 | We do not cache source address of outgoing interface, |
| 1545 | because it is used only by IP RR, TS and SRR options, |
| 1546 | so that it out of fast path. |
| 1547 | |
| 1548 | BTW remember: "addr" is allowed to be not aligned |
| 1549 | in IP options! |
| 1550 | */ |
| 1551 | |
| 1552 | void ip_rt_get_source(u8 *addr, struct rtable *rt) |
| 1553 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1554 | __be32 src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | struct fib_result res; |
| 1556 | |
| 1557 | if (rt->fl.iif == 0) |
| 1558 | src = rt->rt_src; |
Denis V. Lunev | ecfdc8c | 2008-01-21 17:35:06 -0800 | [diff] [blame] | 1559 | else if (fib_lookup(rt->u.dst.dev->nd_net, &rt->fl, &res) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | src = FIB_RES_PREFSRC(res); |
| 1561 | fib_res_put(&res); |
| 1562 | } else |
| 1563 | src = inet_select_addr(rt->u.dst.dev, rt->rt_gateway, |
| 1564 | RT_SCOPE_UNIVERSE); |
| 1565 | memcpy(addr, &src, 4); |
| 1566 | } |
| 1567 | |
| 1568 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1569 | static void set_class_tag(struct rtable *rt, u32 tag) |
| 1570 | { |
| 1571 | if (!(rt->u.dst.tclassid & 0xFFFF)) |
| 1572 | rt->u.dst.tclassid |= tag & 0xFFFF; |
| 1573 | if (!(rt->u.dst.tclassid & 0xFFFF0000)) |
| 1574 | rt->u.dst.tclassid |= tag & 0xFFFF0000; |
| 1575 | } |
| 1576 | #endif |
| 1577 | |
| 1578 | static void rt_set_nexthop(struct rtable *rt, struct fib_result *res, u32 itag) |
| 1579 | { |
| 1580 | struct fib_info *fi = res->fi; |
| 1581 | |
| 1582 | if (fi) { |
| 1583 | if (FIB_RES_GW(*res) && |
| 1584 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
| 1585 | rt->rt_gateway = FIB_RES_GW(*res); |
| 1586 | memcpy(rt->u.dst.metrics, fi->fib_metrics, |
| 1587 | sizeof(rt->u.dst.metrics)); |
| 1588 | if (fi->fib_mtu == 0) { |
| 1589 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; |
| 1590 | if (rt->u.dst.metrics[RTAX_LOCK-1] & (1 << RTAX_MTU) && |
| 1591 | rt->rt_gateway != rt->rt_dst && |
| 1592 | rt->u.dst.dev->mtu > 576) |
| 1593 | rt->u.dst.metrics[RTAX_MTU-1] = 576; |
| 1594 | } |
| 1595 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1596 | rt->u.dst.tclassid = FIB_RES_NH(*res).nh_tclassid; |
| 1597 | #endif |
| 1598 | } else |
| 1599 | rt->u.dst.metrics[RTAX_MTU-1]= rt->u.dst.dev->mtu; |
| 1600 | |
| 1601 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) |
| 1602 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = sysctl_ip_default_ttl; |
| 1603 | if (rt->u.dst.metrics[RTAX_MTU-1] > IP_MAX_MTU) |
| 1604 | rt->u.dst.metrics[RTAX_MTU-1] = IP_MAX_MTU; |
| 1605 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0) |
| 1606 | rt->u.dst.metrics[RTAX_ADVMSS-1] = max_t(unsigned int, rt->u.dst.dev->mtu - 40, |
| 1607 | ip_rt_min_advmss); |
| 1608 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] > 65535 - 40) |
| 1609 | rt->u.dst.metrics[RTAX_ADVMSS-1] = 65535 - 40; |
| 1610 | |
| 1611 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1612 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 1613 | set_class_tag(rt, fib_rules_tclass(res)); |
| 1614 | #endif |
| 1615 | set_class_tag(rt, itag); |
| 1616 | #endif |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1617 | rt->rt_type = res->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | } |
| 1619 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1620 | 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] | 1621 | u8 tos, struct net_device *dev, int our) |
| 1622 | { |
| 1623 | unsigned hash; |
| 1624 | struct rtable *rth; |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1625 | __be32 spec_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | struct in_device *in_dev = in_dev_get(dev); |
| 1627 | u32 itag = 0; |
| 1628 | |
| 1629 | /* Primary sanity checks. */ |
| 1630 | |
| 1631 | if (in_dev == NULL) |
| 1632 | return -EINVAL; |
| 1633 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1634 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1635 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | goto e_inval; |
| 1637 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1638 | if (ipv4_is_zeronet(saddr)) { |
| 1639 | if (!ipv4_is_local_multicast(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | goto e_inval; |
| 1641 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
| 1642 | } else if (fib_validate_source(saddr, 0, tos, 0, |
| 1643 | dev, &spec_dst, &itag) < 0) |
| 1644 | goto e_inval; |
| 1645 | |
| 1646 | rth = dst_alloc(&ipv4_dst_ops); |
| 1647 | if (!rth) |
| 1648 | goto e_nobufs; |
| 1649 | |
| 1650 | rth->u.dst.output= ip_rt_bug; |
| 1651 | |
| 1652 | atomic_set(&rth->u.dst.__refcnt, 1); |
| 1653 | rth->u.dst.flags= DST_HOST; |
Herbert Xu | 42f811b | 2007-06-04 23:34:44 -0700 | [diff] [blame] | 1654 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | rth->u.dst.flags |= DST_NOPOLICY; |
| 1656 | rth->fl.fl4_dst = daddr; |
| 1657 | rth->rt_dst = daddr; |
| 1658 | rth->fl.fl4_tos = tos; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1659 | rth->fl.mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | rth->fl.fl4_src = saddr; |
| 1661 | rth->rt_src = saddr; |
| 1662 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1663 | rth->u.dst.tclassid = itag; |
| 1664 | #endif |
| 1665 | rth->rt_iif = |
| 1666 | rth->fl.iif = dev->ifindex; |
Eric W. Biederman | 2774c7a | 2007-09-26 22:10:56 -0700 | [diff] [blame] | 1667 | rth->u.dst.dev = init_net.loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | dev_hold(rth->u.dst.dev); |
| 1669 | rth->idev = in_dev_get(rth->u.dst.dev); |
| 1670 | rth->fl.oif = 0; |
| 1671 | rth->rt_gateway = daddr; |
| 1672 | rth->rt_spec_dst= spec_dst; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1673 | rth->rt_genid = atomic_read(&rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | rth->rt_flags = RTCF_MULTICAST; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1675 | rth->rt_type = RTN_MULTICAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | if (our) { |
| 1677 | rth->u.dst.input= ip_local_deliver; |
| 1678 | rth->rt_flags |= RTCF_LOCAL; |
| 1679 | } |
| 1680 | |
| 1681 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1682 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | rth->u.dst.input = ip_mr_input; |
| 1684 | #endif |
| 1685 | RT_CACHE_STAT_INC(in_slow_mc); |
| 1686 | |
| 1687 | in_dev_put(in_dev); |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1688 | hash = rt_hash(daddr, saddr, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | return rt_intern_hash(hash, rth, (struct rtable**) &skb->dst); |
| 1690 | |
| 1691 | e_nobufs: |
| 1692 | in_dev_put(in_dev); |
| 1693 | return -ENOBUFS; |
| 1694 | |
| 1695 | e_inval: |
| 1696 | in_dev_put(in_dev); |
| 1697 | return -EINVAL; |
| 1698 | } |
| 1699 | |
| 1700 | |
| 1701 | static void ip_handle_martian_source(struct net_device *dev, |
| 1702 | struct in_device *in_dev, |
| 1703 | struct sk_buff *skb, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1704 | __be32 daddr, |
| 1705 | __be32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | { |
| 1707 | RT_CACHE_STAT_INC(in_martian_src); |
| 1708 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1709 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { |
| 1710 | /* |
| 1711 | * RFC1812 recommendation, if source is martian, |
| 1712 | * the only hint is MAC header. |
| 1713 | */ |
| 1714 | printk(KERN_WARNING "martian source %u.%u.%u.%u from " |
| 1715 | "%u.%u.%u.%u, on dev %s\n", |
| 1716 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1717 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | int i; |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1719 | const unsigned char *p = skb_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | printk(KERN_WARNING "ll header: "); |
| 1721 | for (i = 0; i < dev->hard_header_len; i++, p++) { |
| 1722 | printk("%02x", *p); |
| 1723 | if (i < (dev->hard_header_len - 1)) |
| 1724 | printk(":"); |
| 1725 | } |
| 1726 | printk("\n"); |
| 1727 | } |
| 1728 | } |
| 1729 | #endif |
| 1730 | } |
| 1731 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1732 | static inline int __mkroute_input(struct sk_buff *skb, |
| 1733 | struct fib_result* res, |
| 1734 | struct in_device *in_dev, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1735 | __be32 daddr, __be32 saddr, u32 tos, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1736 | struct rtable **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | { |
| 1738 | |
| 1739 | struct rtable *rth; |
| 1740 | int err; |
| 1741 | struct in_device *out_dev; |
| 1742 | unsigned flags = 0; |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 1743 | __be32 spec_dst; |
| 1744 | u32 itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | |
| 1746 | /* get a working reference to the output device */ |
| 1747 | out_dev = in_dev_get(FIB_RES_DEV(*res)); |
| 1748 | if (out_dev == NULL) { |
| 1749 | if (net_ratelimit()) |
| 1750 | printk(KERN_CRIT "Bug in ip_route_input" \ |
| 1751 | "_slow(). Please, report\n"); |
| 1752 | return -EINVAL; |
| 1753 | } |
| 1754 | |
| 1755 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1756 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | in_dev->dev, &spec_dst, &itag); |
| 1758 | if (err < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1759 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | saddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | err = -EINVAL; |
| 1763 | goto cleanup; |
| 1764 | } |
| 1765 | |
| 1766 | if (err) |
| 1767 | flags |= RTCF_DIRECTSRC; |
| 1768 | |
Rami Rosen | cb7928a | 2008-01-09 00:18:24 -0800 | [diff] [blame] | 1769 | if (out_dev == in_dev && err && !(flags & RTCF_MASQ) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | (IN_DEV_SHARED_MEDIA(out_dev) || |
| 1771 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
| 1772 | flags |= RTCF_DOREDIRECT; |
| 1773 | |
| 1774 | if (skb->protocol != htons(ETH_P_IP)) { |
| 1775 | /* Not IP (i.e. ARP). Do not create route, if it is |
| 1776 | * invalid for proxy arp. DNAT routes are always valid. |
| 1777 | */ |
Rami Rosen | cb7928a | 2008-01-09 00:18:24 -0800 | [diff] [blame] | 1778 | if (out_dev == in_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | err = -EINVAL; |
| 1780 | goto cleanup; |
| 1781 | } |
| 1782 | } |
| 1783 | |
| 1784 | |
| 1785 | rth = dst_alloc(&ipv4_dst_ops); |
| 1786 | if (!rth) { |
| 1787 | err = -ENOBUFS; |
| 1788 | goto cleanup; |
| 1789 | } |
| 1790 | |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 1791 | atomic_set(&rth->u.dst.__refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | rth->u.dst.flags= DST_HOST; |
Herbert Xu | 42f811b | 2007-06-04 23:34:44 -0700 | [diff] [blame] | 1793 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | rth->u.dst.flags |= DST_NOPOLICY; |
Herbert Xu | 42f811b | 2007-06-04 23:34:44 -0700 | [diff] [blame] | 1795 | if (IN_DEV_CONF_GET(out_dev, NOXFRM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | rth->u.dst.flags |= DST_NOXFRM; |
| 1797 | rth->fl.fl4_dst = daddr; |
| 1798 | rth->rt_dst = daddr; |
| 1799 | rth->fl.fl4_tos = tos; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1800 | rth->fl.mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | rth->fl.fl4_src = saddr; |
| 1802 | rth->rt_src = saddr; |
| 1803 | rth->rt_gateway = daddr; |
| 1804 | rth->rt_iif = |
| 1805 | rth->fl.iif = in_dev->dev->ifindex; |
| 1806 | rth->u.dst.dev = (out_dev)->dev; |
| 1807 | dev_hold(rth->u.dst.dev); |
| 1808 | rth->idev = in_dev_get(rth->u.dst.dev); |
| 1809 | rth->fl.oif = 0; |
| 1810 | rth->rt_spec_dst= spec_dst; |
| 1811 | |
| 1812 | rth->u.dst.input = ip_forward; |
| 1813 | rth->u.dst.output = ip_output; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1814 | rth->rt_genid = atomic_read(&rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | |
| 1816 | rt_set_nexthop(rth, res, itag); |
| 1817 | |
| 1818 | rth->rt_flags = flags; |
| 1819 | |
| 1820 | *result = rth; |
| 1821 | err = 0; |
| 1822 | cleanup: |
| 1823 | /* release the working reference to the output device */ |
| 1824 | in_dev_put(out_dev); |
| 1825 | return err; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1826 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
David S. Miller | e06e7c6 | 2007-06-10 17:22:39 -0700 | [diff] [blame] | 1828 | static inline int ip_mkroute_input(struct sk_buff *skb, |
| 1829 | struct fib_result* res, |
| 1830 | const struct flowi *fl, |
| 1831 | struct in_device *in_dev, |
| 1832 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | { |
Chuck Short | 7abaa27 | 2005-06-22 22:10:23 -0700 | [diff] [blame] | 1834 | struct rtable* rth = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | int err; |
| 1836 | unsigned hash; |
| 1837 | |
| 1838 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 1839 | if (res->fi && res->fi->fib_nhs > 1 && fl->oif == 0) |
| 1840 | fib_select_multipath(fl, res); |
| 1841 | #endif |
| 1842 | |
| 1843 | /* create a routing cache entry */ |
| 1844 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); |
| 1845 | if (err) |
| 1846 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | |
| 1848 | /* put it into the cache */ |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 1849 | hash = rt_hash(daddr, saddr, fl->iif); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1850 | return rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | } |
| 1852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | /* |
| 1854 | * NOTE. We drop all the packets that has local source |
| 1855 | * addresses, because every properly looped back packet |
| 1856 | * must have correct destination already attached by output routine. |
| 1857 | * |
| 1858 | * Such approach solves two big problems: |
| 1859 | * 1. Not simplex devices are handled properly. |
| 1860 | * 2. IP spoofing attempts are filtered with 100% of guarantee. |
| 1861 | */ |
| 1862 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1863 | 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] | 1864 | u8 tos, struct net_device *dev) |
| 1865 | { |
| 1866 | struct fib_result res; |
| 1867 | struct in_device *in_dev = in_dev_get(dev); |
| 1868 | struct flowi fl = { .nl_u = { .ip4_u = |
| 1869 | { .daddr = daddr, |
| 1870 | .saddr = saddr, |
| 1871 | .tos = tos, |
| 1872 | .scope = RT_SCOPE_UNIVERSE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | } }, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1874 | .mark = skb->mark, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | .iif = dev->ifindex }; |
| 1876 | unsigned flags = 0; |
| 1877 | u32 itag = 0; |
| 1878 | struct rtable * rth; |
| 1879 | unsigned hash; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1880 | __be32 spec_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | int err = -EINVAL; |
| 1882 | int free_res = 0; |
Denis V. Lunev | 84a885f | 2008-01-21 17:34:35 -0800 | [diff] [blame] | 1883 | struct net * net = dev->nd_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | |
| 1885 | /* IP on this device is disabled. */ |
| 1886 | |
| 1887 | if (!in_dev) |
| 1888 | goto out; |
| 1889 | |
| 1890 | /* Check for the most weird martians, which can be not detected |
| 1891 | by fib_lookup. |
| 1892 | */ |
| 1893 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1894 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1895 | ipv4_is_loopback(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | goto martian_source; |
| 1897 | |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1898 | if (daddr == htonl(0xFFFFFFFF) || (saddr == 0 && daddr == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | goto brd_input; |
| 1900 | |
| 1901 | /* Accept zero addresses only to limited broadcast; |
| 1902 | * I even do not know to fix it or not. Waiting for complains :-) |
| 1903 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1904 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | goto martian_source; |
| 1906 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1907 | if (ipv4_is_lbcast(daddr) || ipv4_is_zeronet(daddr) || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1908 | ipv4_is_loopback(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | goto martian_destination; |
| 1910 | |
| 1911 | /* |
| 1912 | * Now we are ready to route packet. |
| 1913 | */ |
Denis V. Lunev | 84a885f | 2008-01-21 17:34:35 -0800 | [diff] [blame] | 1914 | if ((err = fib_lookup(net, &fl, &res)) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | if (!IN_DEV_FORWARD(in_dev)) |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 1916 | goto e_hostunreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | goto no_route; |
| 1918 | } |
| 1919 | free_res = 1; |
| 1920 | |
| 1921 | RT_CACHE_STAT_INC(in_slow_tot); |
| 1922 | |
| 1923 | if (res.type == RTN_BROADCAST) |
| 1924 | goto brd_input; |
| 1925 | |
| 1926 | if (res.type == RTN_LOCAL) { |
| 1927 | int result; |
| 1928 | result = fib_validate_source(saddr, daddr, tos, |
Denis V. Lunev | 84a885f | 2008-01-21 17:34:35 -0800 | [diff] [blame] | 1929 | net->loopback_dev->ifindex, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | dev, &spec_dst, &itag); |
| 1931 | if (result < 0) |
| 1932 | goto martian_source; |
| 1933 | if (result) |
| 1934 | flags |= RTCF_DIRECTSRC; |
| 1935 | spec_dst = daddr; |
| 1936 | goto local_input; |
| 1937 | } |
| 1938 | |
| 1939 | if (!IN_DEV_FORWARD(in_dev)) |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 1940 | goto e_hostunreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | if (res.type != RTN_UNICAST) |
| 1942 | goto martian_destination; |
| 1943 | |
| 1944 | err = ip_mkroute_input(skb, &res, &fl, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | done: |
| 1946 | in_dev_put(in_dev); |
| 1947 | if (free_res) |
| 1948 | fib_res_put(&res); |
| 1949 | out: return err; |
| 1950 | |
| 1951 | brd_input: |
| 1952 | if (skb->protocol != htons(ETH_P_IP)) |
| 1953 | goto e_inval; |
| 1954 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1955 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
| 1957 | else { |
| 1958 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, |
| 1959 | &itag); |
| 1960 | if (err < 0) |
| 1961 | goto martian_source; |
| 1962 | if (err) |
| 1963 | flags |= RTCF_DIRECTSRC; |
| 1964 | } |
| 1965 | flags |= RTCF_BROADCAST; |
| 1966 | res.type = RTN_BROADCAST; |
| 1967 | RT_CACHE_STAT_INC(in_brd); |
| 1968 | |
| 1969 | local_input: |
| 1970 | rth = dst_alloc(&ipv4_dst_ops); |
| 1971 | if (!rth) |
| 1972 | goto e_nobufs; |
| 1973 | |
| 1974 | rth->u.dst.output= ip_rt_bug; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1975 | rth->rt_genid = atomic_read(&rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | |
| 1977 | atomic_set(&rth->u.dst.__refcnt, 1); |
| 1978 | rth->u.dst.flags= DST_HOST; |
Herbert Xu | 42f811b | 2007-06-04 23:34:44 -0700 | [diff] [blame] | 1979 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | rth->u.dst.flags |= DST_NOPOLICY; |
| 1981 | rth->fl.fl4_dst = daddr; |
| 1982 | rth->rt_dst = daddr; |
| 1983 | rth->fl.fl4_tos = tos; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 1984 | rth->fl.mark = skb->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | rth->fl.fl4_src = saddr; |
| 1986 | rth->rt_src = saddr; |
| 1987 | #ifdef CONFIG_NET_CLS_ROUTE |
| 1988 | rth->u.dst.tclassid = itag; |
| 1989 | #endif |
| 1990 | rth->rt_iif = |
| 1991 | rth->fl.iif = dev->ifindex; |
Denis V. Lunev | 84a885f | 2008-01-21 17:34:35 -0800 | [diff] [blame] | 1992 | rth->u.dst.dev = net->loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | dev_hold(rth->u.dst.dev); |
| 1994 | rth->idev = in_dev_get(rth->u.dst.dev); |
| 1995 | rth->rt_gateway = daddr; |
| 1996 | rth->rt_spec_dst= spec_dst; |
| 1997 | rth->u.dst.input= ip_local_deliver; |
| 1998 | rth->rt_flags = flags|RTCF_LOCAL; |
| 1999 | if (res.type == RTN_UNREACHABLE) { |
| 2000 | rth->u.dst.input= ip_error; |
| 2001 | rth->u.dst.error= -err; |
| 2002 | rth->rt_flags &= ~RTCF_LOCAL; |
| 2003 | } |
| 2004 | rth->rt_type = res.type; |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2005 | hash = rt_hash(daddr, saddr, fl.iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | err = rt_intern_hash(hash, rth, (struct rtable**)&skb->dst); |
| 2007 | goto done; |
| 2008 | |
| 2009 | no_route: |
| 2010 | RT_CACHE_STAT_INC(in_no_route); |
| 2011 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 2012 | res.type = RTN_UNREACHABLE; |
Mitsuru Chinen | 7f53878 | 2007-12-07 01:07:24 -0800 | [diff] [blame] | 2013 | if (err == -ESRCH) |
| 2014 | err = -ENETUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | goto local_input; |
| 2016 | |
| 2017 | /* |
| 2018 | * Do not cache martian addresses: they should be logged (RFC1812) |
| 2019 | */ |
| 2020 | martian_destination: |
| 2021 | RT_CACHE_STAT_INC(in_martian_dst); |
| 2022 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 2023 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) |
| 2024 | printk(KERN_WARNING "martian destination %u.%u.%u.%u from " |
| 2025 | "%u.%u.%u.%u, dev %s\n", |
| 2026 | NIPQUAD(daddr), NIPQUAD(saddr), dev->name); |
| 2027 | #endif |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2028 | |
| 2029 | e_hostunreach: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2030 | err = -EHOSTUNREACH; |
| 2031 | goto done; |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | e_inval: |
| 2034 | err = -EINVAL; |
| 2035 | goto done; |
| 2036 | |
| 2037 | e_nobufs: |
| 2038 | err = -ENOBUFS; |
| 2039 | goto done; |
| 2040 | |
| 2041 | martian_source: |
| 2042 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
| 2043 | goto e_inval; |
| 2044 | } |
| 2045 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2046 | int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | u8 tos, struct net_device *dev) |
| 2048 | { |
| 2049 | struct rtable * rth; |
| 2050 | unsigned hash; |
| 2051 | int iif = dev->ifindex; |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 2052 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | |
Patrick McHardy | 4136cd5 | 2008-02-07 17:58:20 -0800 | [diff] [blame] | 2054 | net = dev->nd_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | tos &= IPTOS_RT_MASK; |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2056 | hash = rt_hash(daddr, saddr, iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | |
| 2058 | rcu_read_lock(); |
| 2059 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 2060 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | if (rth->fl.fl4_dst == daddr && |
| 2062 | rth->fl.fl4_src == saddr && |
| 2063 | rth->fl.iif == iif && |
| 2064 | rth->fl.oif == 0 && |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2065 | rth->fl.mark == skb->mark && |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 2066 | rth->fl.fl4_tos == tos && |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 2067 | rth->u.dst.dev->nd_net == net && |
| 2068 | rth->rt_genid == atomic_read(&rt_genid)) { |
Pavel Emelyanov | 03f49f3 | 2007-11-10 21:28:34 -0800 | [diff] [blame] | 2069 | dst_use(&rth->u.dst, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | RT_CACHE_STAT_INC(in_hit); |
| 2071 | rcu_read_unlock(); |
| 2072 | skb->dst = (struct dst_entry*)rth; |
| 2073 | return 0; |
| 2074 | } |
| 2075 | RT_CACHE_STAT_INC(in_hlist_search); |
| 2076 | } |
| 2077 | rcu_read_unlock(); |
| 2078 | |
| 2079 | /* Multicast recognition logic is moved from route cache to here. |
| 2080 | The problem was that too many Ethernet cards have broken/missing |
| 2081 | hardware multicast filters :-( As result the host on multicasting |
| 2082 | network acquires a lot of useless route cache entries, sort of |
| 2083 | SDR messages from all the world. Now we try to get rid of them. |
| 2084 | Really, provided software IP multicast filter is organized |
| 2085 | reasonably (at least, hashed), it does not result in a slowdown |
| 2086 | comparing with route cache reject entries. |
| 2087 | Note, that multicast routers are not affected, because |
| 2088 | route cache entry is created eventually. |
| 2089 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2090 | if (ipv4_is_multicast(daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | struct in_device *in_dev; |
| 2092 | |
| 2093 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2094 | if ((in_dev = __in_dev_get_rcu(dev)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | int our = ip_check_mc(in_dev, daddr, saddr, |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 2096 | ip_hdr(skb)->protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | if (our |
| 2098 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2099 | || (!ipv4_is_local_multicast(daddr) && |
| 2100 | IN_DEV_MFORWARD(in_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | #endif |
| 2102 | ) { |
| 2103 | rcu_read_unlock(); |
| 2104 | return ip_route_input_mc(skb, daddr, saddr, |
| 2105 | tos, dev, our); |
| 2106 | } |
| 2107 | } |
| 2108 | rcu_read_unlock(); |
| 2109 | return -EINVAL; |
| 2110 | } |
| 2111 | return ip_route_input_slow(skb, daddr, saddr, tos, dev); |
| 2112 | } |
| 2113 | |
| 2114 | static inline int __mkroute_output(struct rtable **result, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2115 | struct fib_result* res, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | const struct flowi *fl, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2117 | const struct flowi *oldflp, |
| 2118 | struct net_device *dev_out, |
| 2119 | unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | { |
| 2121 | struct rtable *rth; |
| 2122 | struct in_device *in_dev; |
| 2123 | u32 tos = RT_FL_TOS(oldflp); |
| 2124 | int err = 0; |
| 2125 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2126 | if (ipv4_is_loopback(fl->fl4_src) && !(dev_out->flags&IFF_LOOPBACK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | return -EINVAL; |
| 2128 | |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2129 | if (fl->fl4_dst == htonl(0xFFFFFFFF)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | res->type = RTN_BROADCAST; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2131 | else if (ipv4_is_multicast(fl->fl4_dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | res->type = RTN_MULTICAST; |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 2133 | else if (ipv4_is_lbcast(fl->fl4_dst) || ipv4_is_zeronet(fl->fl4_dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | return -EINVAL; |
| 2135 | |
| 2136 | if (dev_out->flags & IFF_LOOPBACK) |
| 2137 | flags |= RTCF_LOCAL; |
| 2138 | |
| 2139 | /* get work reference to inet device */ |
| 2140 | in_dev = in_dev_get(dev_out); |
| 2141 | if (!in_dev) |
| 2142 | return -EINVAL; |
| 2143 | |
| 2144 | if (res->type == RTN_BROADCAST) { |
| 2145 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
| 2146 | if (res->fi) { |
| 2147 | fib_info_put(res->fi); |
| 2148 | res->fi = NULL; |
| 2149 | } |
| 2150 | } else if (res->type == RTN_MULTICAST) { |
| 2151 | flags |= RTCF_MULTICAST|RTCF_LOCAL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2152 | if (!ip_check_mc(in_dev, oldflp->fl4_dst, oldflp->fl4_src, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | oldflp->proto)) |
| 2154 | flags &= ~RTCF_LOCAL; |
| 2155 | /* If multicast route do not exist use |
| 2156 | default one, but do not gateway in this case. |
| 2157 | Yes, it is hack. |
| 2158 | */ |
| 2159 | if (res->fi && res->prefixlen < 4) { |
| 2160 | fib_info_put(res->fi); |
| 2161 | res->fi = NULL; |
| 2162 | } |
| 2163 | } |
| 2164 | |
| 2165 | |
| 2166 | rth = dst_alloc(&ipv4_dst_ops); |
| 2167 | if (!rth) { |
| 2168 | err = -ENOBUFS; |
| 2169 | goto cleanup; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2170 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | |
Julian Anastasov | ce723d8 | 2005-09-08 13:34:47 -0700 | [diff] [blame] | 2172 | atomic_set(&rth->u.dst.__refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | rth->u.dst.flags= DST_HOST; |
Herbert Xu | 42f811b | 2007-06-04 23:34:44 -0700 | [diff] [blame] | 2174 | if (IN_DEV_CONF_GET(in_dev, NOXFRM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | rth->u.dst.flags |= DST_NOXFRM; |
Herbert Xu | 42f811b | 2007-06-04 23:34:44 -0700 | [diff] [blame] | 2176 | if (IN_DEV_CONF_GET(in_dev, NOPOLICY)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | rth->u.dst.flags |= DST_NOPOLICY; |
| 2178 | |
| 2179 | rth->fl.fl4_dst = oldflp->fl4_dst; |
| 2180 | rth->fl.fl4_tos = tos; |
| 2181 | rth->fl.fl4_src = oldflp->fl4_src; |
| 2182 | rth->fl.oif = oldflp->oif; |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2183 | rth->fl.mark = oldflp->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | rth->rt_dst = fl->fl4_dst; |
| 2185 | rth->rt_src = fl->fl4_src; |
| 2186 | rth->rt_iif = oldflp->oif ? : dev_out->ifindex; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2187 | /* 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] | 2188 | cache entry */ |
| 2189 | rth->u.dst.dev = dev_out; |
| 2190 | dev_hold(dev_out); |
| 2191 | rth->idev = in_dev_get(dev_out); |
| 2192 | rth->rt_gateway = fl->fl4_dst; |
| 2193 | rth->rt_spec_dst= fl->fl4_src; |
| 2194 | |
| 2195 | rth->u.dst.output=ip_output; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 2196 | rth->rt_genid = atomic_read(&rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | |
| 2198 | RT_CACHE_STAT_INC(out_slow_tot); |
| 2199 | |
| 2200 | if (flags & RTCF_LOCAL) { |
| 2201 | rth->u.dst.input = ip_local_deliver; |
| 2202 | rth->rt_spec_dst = fl->fl4_dst; |
| 2203 | } |
| 2204 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
| 2205 | rth->rt_spec_dst = fl->fl4_src; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2206 | if (flags & RTCF_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | !(dev_out->flags & IFF_LOOPBACK)) { |
| 2208 | rth->u.dst.output = ip_mc_output; |
| 2209 | RT_CACHE_STAT_INC(out_slow_mc); |
| 2210 | } |
| 2211 | #ifdef CONFIG_IP_MROUTE |
| 2212 | if (res->type == RTN_MULTICAST) { |
| 2213 | if (IN_DEV_MFORWARD(in_dev) && |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2214 | !ipv4_is_local_multicast(oldflp->fl4_dst)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | rth->u.dst.input = ip_mr_input; |
| 2216 | rth->u.dst.output = ip_mc_output; |
| 2217 | } |
| 2218 | } |
| 2219 | #endif |
| 2220 | } |
| 2221 | |
| 2222 | rt_set_nexthop(rth, res, 0); |
| 2223 | |
| 2224 | rth->rt_flags = flags; |
| 2225 | |
| 2226 | *result = rth; |
| 2227 | cleanup: |
| 2228 | /* release work reference to inet device */ |
| 2229 | in_dev_put(in_dev); |
| 2230 | |
| 2231 | return err; |
| 2232 | } |
| 2233 | |
David S. Miller | e06e7c6 | 2007-06-10 17:22:39 -0700 | [diff] [blame] | 2234 | static inline int ip_mkroute_output(struct rtable **rp, |
| 2235 | struct fib_result* res, |
| 2236 | const struct flowi *fl, |
| 2237 | const struct flowi *oldflp, |
| 2238 | struct net_device *dev_out, |
| 2239 | unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | { |
Chuck Short | 7abaa27 | 2005-06-22 22:10:23 -0700 | [diff] [blame] | 2241 | struct rtable *rth = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | int err = __mkroute_output(&rth, res, fl, oldflp, dev_out, flags); |
| 2243 | unsigned hash; |
| 2244 | if (err == 0) { |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2245 | hash = rt_hash(oldflp->fl4_dst, oldflp->fl4_src, oldflp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | err = rt_intern_hash(hash, rth, rp); |
| 2247 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | return err; |
| 2250 | } |
| 2251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | /* |
| 2253 | * Major route resolver routine. |
| 2254 | */ |
| 2255 | |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2256 | static int ip_route_output_slow(struct net *net, struct rtable **rp, |
| 2257 | const struct flowi *oldflp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | { |
| 2259 | u32 tos = RT_FL_TOS(oldflp); |
| 2260 | struct flowi fl = { .nl_u = { .ip4_u = |
| 2261 | { .daddr = oldflp->fl4_dst, |
| 2262 | .saddr = oldflp->fl4_src, |
| 2263 | .tos = tos & IPTOS_RT_MASK, |
| 2264 | .scope = ((tos & RTO_ONLINK) ? |
| 2265 | RT_SCOPE_LINK : |
| 2266 | RT_SCOPE_UNIVERSE), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | } }, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2268 | .mark = oldflp->mark, |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2269 | .iif = net->loopback_dev->ifindex, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | .oif = oldflp->oif }; |
| 2271 | struct fib_result res; |
| 2272 | unsigned flags = 0; |
| 2273 | struct net_device *dev_out = NULL; |
| 2274 | int free_res = 0; |
| 2275 | int err; |
| 2276 | |
| 2277 | |
| 2278 | res.fi = NULL; |
| 2279 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 2280 | res.r = NULL; |
| 2281 | #endif |
| 2282 | |
| 2283 | if (oldflp->fl4_src) { |
| 2284 | err = -EINVAL; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2285 | if (ipv4_is_multicast(oldflp->fl4_src) || |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 2286 | ipv4_is_lbcast(oldflp->fl4_src) || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2287 | ipv4_is_zeronet(oldflp->fl4_src)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | goto out; |
| 2289 | |
| 2290 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2291 | dev_out = ip_dev_find(net, oldflp->fl4_src); |
David S. Miller | f6c5d73 | 2007-05-18 02:07:50 -0700 | [diff] [blame] | 2292 | if (dev_out == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | goto out; |
| 2294 | |
| 2295 | /* I removed check for oif == dev_out->oif here. |
| 2296 | It was wrong for two reasons: |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 2297 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
| 2298 | is assigned to multiple interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | 2. Moreover, we are allowed to send packets with saddr |
| 2300 | of another iface. --ANK |
| 2301 | */ |
| 2302 | |
David S. Miller | f6c5d73 | 2007-05-18 02:07:50 -0700 | [diff] [blame] | 2303 | if (oldflp->oif == 0 |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2304 | && (ipv4_is_multicast(oldflp->fl4_dst) || |
| 2305 | oldflp->fl4_dst == htonl(0xFFFFFFFF))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | /* Special hack: user can direct multicasts |
| 2307 | and limited broadcast via necessary interface |
| 2308 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. |
| 2309 | This hack is not just for fun, it allows |
| 2310 | vic,vat and friends to work. |
| 2311 | They bind socket to loopback, set ttl to zero |
| 2312 | and expect that it will work. |
| 2313 | From the viewpoint of routing cache they are broken, |
| 2314 | because we are not allowed to build multicast path |
| 2315 | with loopback source addr (look, routing cache |
| 2316 | cannot know, that ttl is zero, so that packet |
| 2317 | will not leave this host and route is valid). |
| 2318 | Luckily, this hack is good workaround. |
| 2319 | */ |
| 2320 | |
| 2321 | fl.oif = dev_out->ifindex; |
| 2322 | goto make_route; |
| 2323 | } |
| 2324 | if (dev_out) |
| 2325 | dev_put(dev_out); |
| 2326 | dev_out = NULL; |
| 2327 | } |
| 2328 | |
| 2329 | |
| 2330 | if (oldflp->oif) { |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2331 | dev_out = dev_get_by_index(net, oldflp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | err = -ENODEV; |
| 2333 | if (dev_out == NULL) |
| 2334 | goto out; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2335 | |
| 2336 | /* RACE: Check return value of inet_select_addr instead. */ |
| 2337 | if (__in_dev_get_rtnl(dev_out) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | dev_put(dev_out); |
| 2339 | goto out; /* Wrong error code */ |
| 2340 | } |
| 2341 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2342 | if (ipv4_is_local_multicast(oldflp->fl4_dst) || |
| 2343 | oldflp->fl4_dst == htonl(0xFFFFFFFF)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | if (!fl.fl4_src) |
| 2345 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2346 | RT_SCOPE_LINK); |
| 2347 | goto make_route; |
| 2348 | } |
| 2349 | if (!fl.fl4_src) { |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2350 | if (ipv4_is_multicast(oldflp->fl4_dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2352 | fl.fl4_scope); |
| 2353 | else if (!oldflp->fl4_dst) |
| 2354 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2355 | RT_SCOPE_HOST); |
| 2356 | } |
| 2357 | } |
| 2358 | |
| 2359 | if (!fl.fl4_dst) { |
| 2360 | fl.fl4_dst = fl.fl4_src; |
| 2361 | if (!fl.fl4_dst) |
| 2362 | fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK); |
| 2363 | if (dev_out) |
| 2364 | dev_put(dev_out); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2365 | dev_out = net->loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | dev_hold(dev_out); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2367 | fl.oif = net->loopback_dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | res.type = RTN_LOCAL; |
| 2369 | flags |= RTCF_LOCAL; |
| 2370 | goto make_route; |
| 2371 | } |
| 2372 | |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2373 | if (fib_lookup(net, &fl, &res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | res.fi = NULL; |
| 2375 | if (oldflp->oif) { |
| 2376 | /* Apparently, routing tables are wrong. Assume, |
| 2377 | that the destination is on link. |
| 2378 | |
| 2379 | WHY? DW. |
| 2380 | Because we are allowed to send to iface |
| 2381 | even if it has NO routes and NO assigned |
| 2382 | addresses. When oif is specified, routing |
| 2383 | tables are looked up with only one purpose: |
| 2384 | to catch if destination is gatewayed, rather than |
| 2385 | direct. Moreover, if MSG_DONTROUTE is set, |
| 2386 | we send packet, ignoring both routing tables |
| 2387 | and ifaddr state. --ANK |
| 2388 | |
| 2389 | |
| 2390 | We could make it even if oif is unknown, |
| 2391 | likely IPv6, but we do not. |
| 2392 | */ |
| 2393 | |
| 2394 | if (fl.fl4_src == 0) |
| 2395 | fl.fl4_src = inet_select_addr(dev_out, 0, |
| 2396 | RT_SCOPE_LINK); |
| 2397 | res.type = RTN_UNICAST; |
| 2398 | goto make_route; |
| 2399 | } |
| 2400 | if (dev_out) |
| 2401 | dev_put(dev_out); |
| 2402 | err = -ENETUNREACH; |
| 2403 | goto out; |
| 2404 | } |
| 2405 | free_res = 1; |
| 2406 | |
| 2407 | if (res.type == RTN_LOCAL) { |
| 2408 | if (!fl.fl4_src) |
| 2409 | fl.fl4_src = fl.fl4_dst; |
| 2410 | if (dev_out) |
| 2411 | dev_put(dev_out); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2412 | dev_out = net->loopback_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | dev_hold(dev_out); |
| 2414 | fl.oif = dev_out->ifindex; |
| 2415 | if (res.fi) |
| 2416 | fib_info_put(res.fi); |
| 2417 | res.fi = NULL; |
| 2418 | flags |= RTCF_LOCAL; |
| 2419 | goto make_route; |
| 2420 | } |
| 2421 | |
| 2422 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 2423 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
| 2424 | fib_select_multipath(&fl, &res); |
| 2425 | else |
| 2426 | #endif |
| 2427 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl.oif) |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2428 | fib_select_default(net, &fl, &res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
| 2430 | if (!fl.fl4_src) |
| 2431 | fl.fl4_src = FIB_RES_PREFSRC(res); |
| 2432 | |
| 2433 | if (dev_out) |
| 2434 | dev_put(dev_out); |
| 2435 | dev_out = FIB_RES_DEV(res); |
| 2436 | dev_hold(dev_out); |
| 2437 | fl.oif = dev_out->ifindex; |
| 2438 | |
| 2439 | |
| 2440 | make_route: |
| 2441 | err = ip_mkroute_output(rp, &res, &fl, oldflp, dev_out, flags); |
| 2442 | |
| 2443 | |
| 2444 | if (free_res) |
| 2445 | fib_res_put(&res); |
| 2446 | if (dev_out) |
| 2447 | dev_put(dev_out); |
| 2448 | out: return err; |
| 2449 | } |
| 2450 | |
Denis V. Lunev | 611c183 | 2008-01-22 22:06:48 -0800 | [diff] [blame] | 2451 | int __ip_route_output_key(struct net *net, struct rtable **rp, |
| 2452 | const struct flowi *flp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | { |
| 2454 | unsigned hash; |
| 2455 | struct rtable *rth; |
| 2456 | |
Al Viro | 8c7bc84 | 2006-09-26 21:26:19 -0700 | [diff] [blame] | 2457 | hash = rt_hash(flp->fl4_dst, flp->fl4_src, flp->oif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
| 2459 | rcu_read_lock_bh(); |
| 2460 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 2461 | rth = rcu_dereference(rth->u.dst.rt_next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | if (rth->fl.fl4_dst == flp->fl4_dst && |
| 2463 | rth->fl.fl4_src == flp->fl4_src && |
| 2464 | rth->fl.iif == 0 && |
| 2465 | rth->fl.oif == flp->oif && |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 2466 | rth->fl.mark == flp->mark && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | !((rth->fl.fl4_tos ^ flp->fl4_tos) & |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 2468 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 2469 | rth->u.dst.dev->nd_net == net && |
| 2470 | rth->rt_genid == atomic_read(&rt_genid)) { |
Pavel Emelyanov | 03f49f3 | 2007-11-10 21:28:34 -0800 | [diff] [blame] | 2471 | dst_use(&rth->u.dst, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | RT_CACHE_STAT_INC(out_hit); |
| 2473 | rcu_read_unlock_bh(); |
| 2474 | *rp = rth; |
| 2475 | return 0; |
| 2476 | } |
| 2477 | RT_CACHE_STAT_INC(out_hlist_search); |
| 2478 | } |
| 2479 | rcu_read_unlock_bh(); |
| 2480 | |
Denis V. Lunev | 611c183 | 2008-01-22 22:06:48 -0800 | [diff] [blame] | 2481 | return ip_route_output_slow(net, rp, flp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | } |
| 2483 | |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2484 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
| 2485 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2486 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 2487 | { |
| 2488 | } |
| 2489 | |
| 2490 | static struct dst_ops ipv4_dst_blackhole_ops = { |
| 2491 | .family = AF_INET, |
| 2492 | .protocol = __constant_htons(ETH_P_IP), |
| 2493 | .destroy = ipv4_dst_destroy, |
| 2494 | .check = ipv4_dst_check, |
| 2495 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
| 2496 | .entry_size = sizeof(struct rtable), |
Eric Dumazet | e242297 | 2008-01-30 20:07:45 -0800 | [diff] [blame] | 2497 | .entries = ATOMIC_INIT(0), |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2498 | }; |
| 2499 | |
| 2500 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2501 | static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp, struct sock *sk) |
| 2502 | { |
| 2503 | struct rtable *ort = *rp; |
| 2504 | struct rtable *rt = (struct rtable *) |
| 2505 | dst_alloc(&ipv4_dst_blackhole_ops); |
| 2506 | |
| 2507 | if (rt) { |
| 2508 | struct dst_entry *new = &rt->u.dst; |
| 2509 | |
| 2510 | atomic_set(&new->__refcnt, 1); |
| 2511 | new->__use = 1; |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 2512 | new->input = dst_discard; |
| 2513 | new->output = dst_discard; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2514 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
| 2515 | |
| 2516 | new->dev = ort->u.dst.dev; |
| 2517 | if (new->dev) |
| 2518 | dev_hold(new->dev); |
| 2519 | |
| 2520 | rt->fl = ort->fl; |
| 2521 | |
| 2522 | rt->idev = ort->idev; |
| 2523 | if (rt->idev) |
| 2524 | in_dev_hold(rt->idev); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 2525 | rt->rt_genid = atomic_read(&rt_genid); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2526 | rt->rt_flags = ort->rt_flags; |
| 2527 | rt->rt_type = ort->rt_type; |
| 2528 | rt->rt_dst = ort->rt_dst; |
| 2529 | rt->rt_src = ort->rt_src; |
| 2530 | rt->rt_iif = ort->rt_iif; |
| 2531 | rt->rt_gateway = ort->rt_gateway; |
| 2532 | rt->rt_spec_dst = ort->rt_spec_dst; |
| 2533 | rt->peer = ort->peer; |
| 2534 | if (rt->peer) |
| 2535 | atomic_inc(&rt->peer->refcnt); |
| 2536 | |
| 2537 | dst_free(new); |
| 2538 | } |
| 2539 | |
| 2540 | dst_release(&(*rp)->u.dst); |
| 2541 | *rp = rt; |
| 2542 | return (rt ? 0 : -ENOMEM); |
| 2543 | } |
| 2544 | |
Denis V. Lunev | f1b050b | 2008-01-22 22:07:10 -0800 | [diff] [blame] | 2545 | int ip_route_output_flow(struct net *net, struct rtable **rp, struct flowi *flp, |
| 2546 | struct sock *sk, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | { |
| 2548 | int err; |
| 2549 | |
Denis V. Lunev | f1b050b | 2008-01-22 22:07:10 -0800 | [diff] [blame] | 2550 | if ((err = __ip_route_output_key(net, rp, flp)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | return err; |
| 2552 | |
| 2553 | if (flp->proto) { |
| 2554 | if (!flp->fl4_src) |
| 2555 | flp->fl4_src = (*rp)->rt_src; |
| 2556 | if (!flp->fl4_dst) |
| 2557 | flp->fl4_dst = (*rp)->rt_dst; |
Herbert Xu | bb72845 | 2007-12-12 18:48:58 -0800 | [diff] [blame] | 2558 | err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, |
| 2559 | flags ? XFRM_LOOKUP_WAIT : 0); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2560 | if (err == -EREMOTE) |
| 2561 | err = ipv4_dst_blackhole(rp, flp, sk); |
| 2562 | |
| 2563 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | } |
| 2565 | |
| 2566 | return 0; |
| 2567 | } |
| 2568 | |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2569 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
| 2570 | |
Denis V. Lunev | f206351 | 2008-01-22 22:07:34 -0800 | [diff] [blame] | 2571 | int ip_route_output_key(struct net *net, struct rtable **rp, struct flowi *flp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | { |
Denis V. Lunev | f206351 | 2008-01-22 22:07:34 -0800 | [diff] [blame] | 2573 | return ip_route_output_flow(net, rp, flp, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | } |
| 2575 | |
| 2576 | 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] | 2577 | int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | { |
| 2579 | struct rtable *rt = (struct rtable*)skb->dst; |
| 2580 | struct rtmsg *r; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2581 | struct nlmsghdr *nlh; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2582 | long expires; |
| 2583 | u32 id = 0, ts = 0, tsage = 0, error; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2584 | |
| 2585 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); |
| 2586 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2587 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2588 | |
| 2589 | r = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | r->rtm_family = AF_INET; |
| 2591 | r->rtm_dst_len = 32; |
| 2592 | r->rtm_src_len = 0; |
| 2593 | r->rtm_tos = rt->fl.fl4_tos; |
| 2594 | r->rtm_table = RT_TABLE_MAIN; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2595 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | r->rtm_type = rt->rt_type; |
| 2597 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2598 | r->rtm_protocol = RTPROT_UNSPEC; |
| 2599 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 2600 | if (rt->rt_flags & RTCF_NOTIFY) |
| 2601 | r->rtm_flags |= RTM_F_NOTIFY; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2602 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2603 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | if (rt->fl.fl4_src) { |
| 2606 | r->rtm_src_len = 32; |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2607 | NLA_PUT_BE32(skb, RTA_SRC, rt->fl.fl4_src); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | } |
| 2609 | if (rt->u.dst.dev) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2610 | NLA_PUT_U32(skb, RTA_OIF, rt->u.dst.dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2611 | #ifdef CONFIG_NET_CLS_ROUTE |
| 2612 | if (rt->u.dst.tclassid) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2613 | NLA_PUT_U32(skb, RTA_FLOW, rt->u.dst.tclassid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | if (rt->fl.iif) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2616 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | else if (rt->rt_src != rt->fl.fl4_src) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2618 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | if (rt->rt_dst != rt->rt_gateway) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2621 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2624 | goto nla_put_failure; |
| 2625 | |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2626 | error = rt->u.dst.error; |
| 2627 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | if (rt->peer) { |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2629 | id = rt->peer->ip_id_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | if (rt->peer->tcp_ts_stamp) { |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2631 | ts = rt->peer->tcp_ts; |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 2632 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | } |
| 2634 | } |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2636 | if (rt->fl.iif) { |
| 2637 | #ifdef CONFIG_IP_MROUTE |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2638 | __be32 dst = rt->rt_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2640 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
Pavel Emelyanov | 586f121 | 2007-12-16 13:32:48 -0800 | [diff] [blame] | 2641 | IPV4_DEVCONF_ALL(&init_net, MC_FORWARDING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2642 | int err = ipmr_get_route(skb, r, nowait); |
| 2643 | if (err <= 0) { |
| 2644 | if (!nowait) { |
| 2645 | if (err == 0) |
| 2646 | return 0; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2647 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2648 | } else { |
| 2649 | if (err == -EMSGSIZE) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2650 | goto nla_put_failure; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2651 | error = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2652 | } |
| 2653 | } |
| 2654 | } else |
| 2655 | #endif |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2656 | NLA_PUT_U32(skb, RTA_IIF, rt->fl.iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | } |
| 2658 | |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2659 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, id, ts, tsage, |
| 2660 | expires, error) < 0) |
| 2661 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2662 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2663 | return nlmsg_end(skb, nlh); |
| 2664 | |
| 2665 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2666 | nlmsg_cancel(skb, nlh); |
| 2667 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | } |
| 2669 | |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 2670 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2671 | { |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 2672 | struct net *net = in_skb->sk->sk_net; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2673 | struct rtmsg *rtm; |
| 2674 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | struct rtable *rt = NULL; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2676 | __be32 dst = 0; |
| 2677 | __be32 src = 0; |
| 2678 | u32 iif; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2679 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2680 | struct sk_buff *skb; |
| 2681 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 2682 | if (net != &init_net) |
| 2683 | return -EINVAL; |
| 2684 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2685 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
| 2686 | if (err < 0) |
| 2687 | goto errout; |
| 2688 | |
| 2689 | rtm = nlmsg_data(nlh); |
| 2690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2691 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2692 | if (skb == NULL) { |
| 2693 | err = -ENOBUFS; |
| 2694 | goto errout; |
| 2695 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | |
| 2697 | /* Reserve room for dummy headers, this skb can pass |
| 2698 | through good chunk of routing engine. |
| 2699 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 2700 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2701 | skb_reset_network_header(skb); |
Stephen Hemminger | d2c962b | 2006-04-17 17:27:11 -0700 | [diff] [blame] | 2702 | |
| 2703 | /* Bugfix: need to give ip_route_input enough of an IP header to not gag. */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 2704 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2705 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
| 2706 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2707 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
| 2708 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2709 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2710 | |
| 2711 | if (iif) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2712 | struct net_device *dev; |
| 2713 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 2714 | dev = __dev_get_by_index(&init_net, iif); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2715 | if (dev == NULL) { |
| 2716 | err = -ENODEV; |
| 2717 | goto errout_free; |
| 2718 | } |
| 2719 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | skb->protocol = htons(ETH_P_IP); |
| 2721 | skb->dev = dev; |
| 2722 | local_bh_disable(); |
| 2723 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); |
| 2724 | local_bh_enable(); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2725 | |
| 2726 | rt = (struct rtable*) skb->dst; |
| 2727 | if (err == 0 && rt->u.dst.error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2728 | err = -rt->u.dst.error; |
| 2729 | } else { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2730 | struct flowi fl = { |
| 2731 | .nl_u = { |
| 2732 | .ip4_u = { |
| 2733 | .daddr = dst, |
| 2734 | .saddr = src, |
| 2735 | .tos = rtm->rtm_tos, |
| 2736 | }, |
| 2737 | }, |
| 2738 | .oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, |
| 2739 | }; |
Denis V. Lunev | f206351 | 2008-01-22 22:07:34 -0800 | [diff] [blame] | 2740 | err = ip_route_output_key(&init_net, &rt, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2741 | } |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | if (err) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2744 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | |
| 2746 | skb->dst = &rt->u.dst; |
| 2747 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 2748 | rt->rt_flags |= RTCF_NOTIFY; |
| 2749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2750 | 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] | 2751 | RTM_NEWROUTE, 0, 0); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2752 | if (err <= 0) |
| 2753 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | |
Denis V. Lunev | 97c53ca | 2007-11-19 22:26:51 -0800 | [diff] [blame] | 2755 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2756 | errout: |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2757 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2759 | errout_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2760 | kfree_skb(skb); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2761 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2762 | } |
| 2763 | |
| 2764 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 2765 | { |
| 2766 | struct rtable *rt; |
| 2767 | int h, s_h; |
| 2768 | int idx, s_idx; |
| 2769 | |
| 2770 | s_h = cb->args[0]; |
Eric Dumazet | d8c9283 | 2008-01-07 21:52:14 -0800 | [diff] [blame] | 2771 | if (s_h < 0) |
| 2772 | s_h = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2773 | s_idx = idx = cb->args[1]; |
Eric Dumazet | d8c9283 | 2008-01-07 21:52:14 -0800 | [diff] [blame] | 2774 | for (h = s_h; h <= rt_hash_mask; h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2775 | rcu_read_lock_bh(); |
| 2776 | for (rt = rcu_dereference(rt_hash_table[h].chain), idx = 0; rt; |
Eric Dumazet | 093c2ca | 2007-02-09 16:19:26 -0800 | [diff] [blame] | 2777 | rt = rcu_dereference(rt->u.dst.rt_next), idx++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2778 | if (idx < s_idx) |
| 2779 | continue; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 2780 | if (rt->rt_genid != atomic_read(&rt_genid)) |
| 2781 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | skb->dst = dst_clone(&rt->u.dst); |
| 2783 | if (rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2784 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2785 | 1, NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | dst_release(xchg(&skb->dst, NULL)); |
| 2787 | rcu_read_unlock_bh(); |
| 2788 | goto done; |
| 2789 | } |
| 2790 | dst_release(xchg(&skb->dst, NULL)); |
| 2791 | } |
| 2792 | rcu_read_unlock_bh(); |
Eric Dumazet | d8c9283 | 2008-01-07 21:52:14 -0800 | [diff] [blame] | 2793 | s_idx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | } |
| 2795 | |
| 2796 | done: |
| 2797 | cb->args[0] = h; |
| 2798 | cb->args[1] = idx; |
| 2799 | return skb->len; |
| 2800 | } |
| 2801 | |
| 2802 | void ip_rt_multicast_event(struct in_device *in_dev) |
| 2803 | { |
| 2804 | rt_cache_flush(0); |
| 2805 | } |
| 2806 | |
| 2807 | #ifdef CONFIG_SYSCTL |
| 2808 | static int flush_delay; |
| 2809 | |
| 2810 | static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write, |
| 2811 | struct file *filp, void __user *buffer, |
| 2812 | size_t *lenp, loff_t *ppos) |
| 2813 | { |
| 2814 | if (write) { |
| 2815 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
| 2816 | rt_cache_flush(flush_delay); |
| 2817 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2818 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2819 | |
| 2820 | return -EINVAL; |
| 2821 | } |
| 2822 | |
| 2823 | static int ipv4_sysctl_rtcache_flush_strategy(ctl_table *table, |
| 2824 | int __user *name, |
| 2825 | int nlen, |
| 2826 | void __user *oldval, |
| 2827 | size_t __user *oldlenp, |
| 2828 | void __user *newval, |
Alexey Dobriyan | 1f29bcd | 2006-12-10 02:19:10 -0800 | [diff] [blame] | 2829 | size_t newlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2830 | { |
| 2831 | int delay; |
| 2832 | if (newlen != sizeof(int)) |
| 2833 | return -EINVAL; |
| 2834 | if (get_user(delay, (int __user *)newval)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2835 | return -EFAULT; |
| 2836 | rt_cache_flush(delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2837 | return 0; |
| 2838 | } |
| 2839 | |
| 2840 | ctl_table ipv4_route_table[] = { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2841 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2842 | .ctl_name = NET_IPV4_ROUTE_FLUSH, |
| 2843 | .procname = "flush", |
| 2844 | .data = &flush_delay, |
| 2845 | .maxlen = sizeof(int), |
Dave Jones | 7e3e036 | 2005-04-28 12:11:03 -0700 | [diff] [blame] | 2846 | .mode = 0200, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | .proc_handler = &ipv4_sysctl_rtcache_flush, |
| 2848 | .strategy = &ipv4_sysctl_rtcache_flush_strategy, |
| 2849 | }, |
| 2850 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2851 | .ctl_name = NET_IPV4_ROUTE_GC_THRESH, |
| 2852 | .procname = "gc_thresh", |
| 2853 | .data = &ipv4_dst_ops.gc_thresh, |
| 2854 | .maxlen = sizeof(int), |
| 2855 | .mode = 0644, |
| 2856 | .proc_handler = &proc_dointvec, |
| 2857 | }, |
| 2858 | { |
| 2859 | .ctl_name = NET_IPV4_ROUTE_MAX_SIZE, |
| 2860 | .procname = "max_size", |
| 2861 | .data = &ip_rt_max_size, |
| 2862 | .maxlen = sizeof(int), |
| 2863 | .mode = 0644, |
| 2864 | .proc_handler = &proc_dointvec, |
| 2865 | }, |
| 2866 | { |
| 2867 | /* Deprecated. Use gc_min_interval_ms */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2869 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL, |
| 2870 | .procname = "gc_min_interval", |
| 2871 | .data = &ip_rt_gc_min_interval, |
| 2872 | .maxlen = sizeof(int), |
| 2873 | .mode = 0644, |
| 2874 | .proc_handler = &proc_dointvec_jiffies, |
| 2875 | .strategy = &sysctl_jiffies, |
| 2876 | }, |
| 2877 | { |
| 2878 | .ctl_name = NET_IPV4_ROUTE_GC_MIN_INTERVAL_MS, |
| 2879 | .procname = "gc_min_interval_ms", |
| 2880 | .data = &ip_rt_gc_min_interval, |
| 2881 | .maxlen = sizeof(int), |
| 2882 | .mode = 0644, |
| 2883 | .proc_handler = &proc_dointvec_ms_jiffies, |
| 2884 | .strategy = &sysctl_ms_jiffies, |
| 2885 | }, |
| 2886 | { |
| 2887 | .ctl_name = NET_IPV4_ROUTE_GC_TIMEOUT, |
| 2888 | .procname = "gc_timeout", |
| 2889 | .data = &ip_rt_gc_timeout, |
| 2890 | .maxlen = sizeof(int), |
| 2891 | .mode = 0644, |
| 2892 | .proc_handler = &proc_dointvec_jiffies, |
| 2893 | .strategy = &sysctl_jiffies, |
| 2894 | }, |
| 2895 | { |
| 2896 | .ctl_name = NET_IPV4_ROUTE_GC_INTERVAL, |
| 2897 | .procname = "gc_interval", |
| 2898 | .data = &ip_rt_gc_interval, |
| 2899 | .maxlen = sizeof(int), |
| 2900 | .mode = 0644, |
| 2901 | .proc_handler = &proc_dointvec_jiffies, |
| 2902 | .strategy = &sysctl_jiffies, |
| 2903 | }, |
| 2904 | { |
| 2905 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_LOAD, |
| 2906 | .procname = "redirect_load", |
| 2907 | .data = &ip_rt_redirect_load, |
| 2908 | .maxlen = sizeof(int), |
| 2909 | .mode = 0644, |
| 2910 | .proc_handler = &proc_dointvec, |
| 2911 | }, |
| 2912 | { |
| 2913 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_NUMBER, |
| 2914 | .procname = "redirect_number", |
| 2915 | .data = &ip_rt_redirect_number, |
| 2916 | .maxlen = sizeof(int), |
| 2917 | .mode = 0644, |
| 2918 | .proc_handler = &proc_dointvec, |
| 2919 | }, |
| 2920 | { |
| 2921 | .ctl_name = NET_IPV4_ROUTE_REDIRECT_SILENCE, |
| 2922 | .procname = "redirect_silence", |
| 2923 | .data = &ip_rt_redirect_silence, |
| 2924 | .maxlen = sizeof(int), |
| 2925 | .mode = 0644, |
| 2926 | .proc_handler = &proc_dointvec, |
| 2927 | }, |
| 2928 | { |
| 2929 | .ctl_name = NET_IPV4_ROUTE_ERROR_COST, |
| 2930 | .procname = "error_cost", |
| 2931 | .data = &ip_rt_error_cost, |
| 2932 | .maxlen = sizeof(int), |
| 2933 | .mode = 0644, |
| 2934 | .proc_handler = &proc_dointvec, |
| 2935 | }, |
| 2936 | { |
| 2937 | .ctl_name = NET_IPV4_ROUTE_ERROR_BURST, |
| 2938 | .procname = "error_burst", |
| 2939 | .data = &ip_rt_error_burst, |
| 2940 | .maxlen = sizeof(int), |
| 2941 | .mode = 0644, |
| 2942 | .proc_handler = &proc_dointvec, |
| 2943 | }, |
| 2944 | { |
| 2945 | .ctl_name = NET_IPV4_ROUTE_GC_ELASTICITY, |
| 2946 | .procname = "gc_elasticity", |
| 2947 | .data = &ip_rt_gc_elasticity, |
| 2948 | .maxlen = sizeof(int), |
| 2949 | .mode = 0644, |
| 2950 | .proc_handler = &proc_dointvec, |
| 2951 | }, |
| 2952 | { |
| 2953 | .ctl_name = NET_IPV4_ROUTE_MTU_EXPIRES, |
| 2954 | .procname = "mtu_expires", |
| 2955 | .data = &ip_rt_mtu_expires, |
| 2956 | .maxlen = sizeof(int), |
| 2957 | .mode = 0644, |
| 2958 | .proc_handler = &proc_dointvec_jiffies, |
| 2959 | .strategy = &sysctl_jiffies, |
| 2960 | }, |
| 2961 | { |
| 2962 | .ctl_name = NET_IPV4_ROUTE_MIN_PMTU, |
| 2963 | .procname = "min_pmtu", |
| 2964 | .data = &ip_rt_min_pmtu, |
| 2965 | .maxlen = sizeof(int), |
| 2966 | .mode = 0644, |
| 2967 | .proc_handler = &proc_dointvec, |
| 2968 | }, |
| 2969 | { |
| 2970 | .ctl_name = NET_IPV4_ROUTE_MIN_ADVMSS, |
| 2971 | .procname = "min_adv_mss", |
| 2972 | .data = &ip_rt_min_advmss, |
| 2973 | .maxlen = sizeof(int), |
| 2974 | .mode = 0644, |
| 2975 | .proc_handler = &proc_dointvec, |
| 2976 | }, |
| 2977 | { |
| 2978 | .ctl_name = NET_IPV4_ROUTE_SECRET_INTERVAL, |
| 2979 | .procname = "secret_interval", |
| 2980 | .data = &ip_rt_secret_interval, |
| 2981 | .maxlen = sizeof(int), |
| 2982 | .mode = 0644, |
| 2983 | .proc_handler = &proc_dointvec_jiffies, |
| 2984 | .strategy = &sysctl_jiffies, |
| 2985 | }, |
| 2986 | { .ctl_name = 0 } |
| 2987 | }; |
| 2988 | #endif |
| 2989 | |
| 2990 | #ifdef CONFIG_NET_CLS_ROUTE |
Eric Dumazet | 8dbde28 | 2007-11-16 03:32:10 -0800 | [diff] [blame] | 2991 | struct ip_rt_acct *ip_rt_acct __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2992 | #endif /* CONFIG_NET_CLS_ROUTE */ |
| 2993 | |
| 2994 | static __initdata unsigned long rhash_entries; |
| 2995 | static int __init set_rhash_entries(char *str) |
| 2996 | { |
| 2997 | if (!str) |
| 2998 | return 0; |
| 2999 | rhash_entries = simple_strtoul(str, &str, 0); |
| 3000 | return 1; |
| 3001 | } |
| 3002 | __setup("rhash_entries=", set_rhash_entries); |
| 3003 | |
| 3004 | int __init ip_rt_init(void) |
| 3005 | { |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3006 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3007 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 3008 | atomic_set(&rt_genid, (int) ((num_physpages ^ (num_physpages>>8)) ^ |
| 3009 | (jiffies ^ (jiffies >> 7)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | |
| 3011 | #ifdef CONFIG_NET_CLS_ROUTE |
Eric Dumazet | 8dbde28 | 2007-11-16 03:32:10 -0800 | [diff] [blame] | 3012 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3013 | if (!ip_rt_acct) |
| 3014 | panic("IP: failed to allocate ip_rt_acct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | #endif |
| 3016 | |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 3017 | ipv4_dst_ops.kmem_cachep = |
| 3018 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 3019 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3020 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 3021 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
| 3022 | |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3023 | rt_hash_table = (struct rt_hash_bucket *) |
| 3024 | alloc_large_system_hash("IP route cache", |
| 3025 | sizeof(struct rt_hash_bucket), |
| 3026 | rhash_entries, |
| 3027 | (num_physpages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 3028 | 15 : 17, |
Kirill Korotaev | 8d1502d | 2006-08-07 20:44:22 -0700 | [diff] [blame] | 3029 | 0, |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3030 | &rt_hash_log, |
| 3031 | &rt_hash_mask, |
| 3032 | 0); |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 3033 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
| 3034 | rt_hash_lock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | |
| 3036 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); |
| 3037 | ip_rt_max_size = (rt_hash_mask + 1) * 16; |
| 3038 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3039 | devinet_init(); |
| 3040 | ip_fib_init(); |
| 3041 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 3042 | setup_timer(&rt_secret_timer, rt_secret_rebuild, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | |
| 3044 | /* All the timers, started at system startup tend |
| 3045 | to synchronize. Perturb it a bit. |
| 3046 | */ |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 3047 | schedule_delayed_work(&expires_work, |
| 3048 | net_random() % ip_rt_gc_interval + ip_rt_gc_interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | |
| 3050 | rt_secret_timer.expires = jiffies + net_random() % ip_rt_secret_interval + |
| 3051 | ip_rt_secret_interval; |
| 3052 | add_timer(&rt_secret_timer); |
| 3053 | |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 3054 | if (ip_rt_proc_init(&init_net)) |
| 3055 | printk(KERN_ERR "Unable to create route proc files\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3056 | #ifdef CONFIG_XFRM |
| 3057 | xfrm_init(); |
| 3058 | xfrm4_init(); |
| 3059 | #endif |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 3060 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
| 3061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3062 | return rc; |
| 3063 | } |
| 3064 | |
| 3065 | EXPORT_SYMBOL(__ip_select_ident); |
| 3066 | EXPORT_SYMBOL(ip_route_input); |
| 3067 | EXPORT_SYMBOL(ip_route_output_key); |