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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 11 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> |
| 12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 13 | * |
| 14 | * Fixes: |
| 15 | * Alan Cox : Verify area fixes. |
| 16 | * Alan Cox : cli() protects routing changes |
| 17 | * Rui Oliveira : ICMP routing table updates |
| 18 | * (rco@di.uminho.pt) Routing table insertion and update |
| 19 | * Linus Torvalds : Rewrote bits to be sensible |
| 20 | * Alan Cox : Added BSD route gw semantics |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 21 | * Alan Cox : Super /proc >4K |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | * Alan Cox : MTU in route table |
| 23 | * Alan Cox : MSS actually. Also added the window |
| 24 | * clamper. |
| 25 | * Sam Lantinga : Fixed route matching in rt_del() |
| 26 | * Alan Cox : Routing cache support. |
| 27 | * Alan Cox : Removed compatibility cruft. |
| 28 | * Alan Cox : RTF_REJECT support. |
| 29 | * Alan Cox : TCP irtt support. |
| 30 | * Jonathan Naylor : Added Metric support. |
| 31 | * Miquel van Smoorenburg : BSD API fixes. |
| 32 | * Miquel van Smoorenburg : Metrics. |
| 33 | * Alan Cox : Use __u32 properly |
| 34 | * Alan Cox : Aligned routing errors more closely with BSD |
| 35 | * our system is still very different. |
| 36 | * Alan Cox : Faster /proc handling |
| 37 | * Alexey Kuznetsov : Massive rework to support tree based routing, |
| 38 | * routing caches and better behaviour. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 39 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | * Olaf Erb : irtt wasn't being copied right. |
| 41 | * Bjorn Ekwall : Kerneld route support. |
| 42 | * Alan Cox : Multicast fixed (I hope) |
| 43 | * Pavel Krauz : Limited broadcast fixed |
| 44 | * Mike McLagan : Routing by source |
| 45 | * Alexey Kuznetsov : End of old history. Split to fib.c and |
| 46 | * route.c and rewritten from scratch. |
| 47 | * Andi Kleen : Load-limit warning messages. |
| 48 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
| 49 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. |
| 50 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. |
| 51 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. |
| 52 | * Marc Boucher : routing by fwmark |
| 53 | * Robert Olsson : Added rt_cache statistics |
| 54 | * Arnaldo C. Melo : Convert proc stuff to seq_file |
Eric Dumazet | bb1d23b | 2005-07-05 15:00:32 -0700 | [diff] [blame] | 55 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
Ilia Sotnikov | cef2685 | 2006-03-25 01:38:55 -0800 | [diff] [blame] | 56 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
| 57 | * Ilia Sotnikov : Removed TOS from hash calculations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * |
| 59 | * This program is free software; you can redistribute it and/or |
| 60 | * modify it under the terms of the GNU General Public License |
| 61 | * as published by the Free Software Foundation; either version |
| 62 | * 2 of the License, or (at your option) any later version. |
| 63 | */ |
| 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <linux/module.h> |
| 66 | #include <asm/uaccess.h> |
| 67 | #include <asm/system.h> |
| 68 | #include <linux/bitops.h> |
| 69 | #include <linux/types.h> |
| 70 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <linux/mm.h> |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 72 | #include <linux/bootmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #include <linux/string.h> |
| 74 | #include <linux/socket.h> |
| 75 | #include <linux/sockios.h> |
| 76 | #include <linux/errno.h> |
| 77 | #include <linux/in.h> |
| 78 | #include <linux/inet.h> |
| 79 | #include <linux/netdevice.h> |
| 80 | #include <linux/proc_fs.h> |
| 81 | #include <linux/init.h> |
Eric Dumazet | 39c90ec | 2007-09-15 10:55:54 -0700 | [diff] [blame] | 82 | #include <linux/workqueue.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <linux/inetdevice.h> |
| 85 | #include <linux/igmp.h> |
| 86 | #include <linux/pkt_sched.h> |
| 87 | #include <linux/mroute.h> |
| 88 | #include <linux/netfilter_ipv4.h> |
| 89 | #include <linux/random.h> |
| 90 | #include <linux/jhash.h> |
| 91 | #include <linux/rcupdate.h> |
| 92 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 93 | #include <linux/slab.h> |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 94 | #include <net/dst.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 95 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #include <net/protocol.h> |
| 97 | #include <net/ip.h> |
| 98 | #include <net/route.h> |
| 99 | #include <net/inetpeer.h> |
| 100 | #include <net/sock.h> |
| 101 | #include <net/ip_fib.h> |
| 102 | #include <net/arp.h> |
| 103 | #include <net/tcp.h> |
| 104 | #include <net/icmp.h> |
| 105 | #include <net/xfrm.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 106 | #include <net/netevent.h> |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 107 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #ifdef CONFIG_SYSCTL |
| 109 | #include <linux/sysctl.h> |
| 110 | #endif |
| 111 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 112 | #define RT_FL_TOS(oldflp4) \ |
| 113 | ((u32)(oldflp4->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | #define IP_MAX_MTU 0xFFF0 |
| 116 | |
| 117 | #define RT_GC_TIMEOUT (300*HZ) |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | static int ip_rt_max_size; |
Stephen Hemminger | 817bc4d | 2008-03-22 17:43:59 -0700 | [diff] [blame] | 120 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
| 121 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
| 122 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; |
| 123 | static int ip_rt_redirect_number __read_mostly = 9; |
| 124 | static int ip_rt_redirect_load __read_mostly = HZ / 50; |
| 125 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); |
| 126 | static int ip_rt_error_cost __read_mostly = HZ; |
| 127 | static int ip_rt_error_burst __read_mostly = 5 * HZ; |
| 128 | static int ip_rt_gc_elasticity __read_mostly = 8; |
| 129 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
| 130 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; |
| 131 | static int ip_rt_min_advmss __read_mostly = 256; |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 132 | static int rt_chain_length_max __read_mostly = 20; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | /* |
| 135 | * Interface to generic destination cache. |
| 136 | */ |
| 137 | |
| 138 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 139 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 140 | static unsigned int ipv4_default_mtu(const struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | static void ipv4_dst_destroy(struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
| 143 | static void ipv4_link_failure(struct sk_buff *skb); |
| 144 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 145 | static int rt_garbage_collect(struct dst_ops *ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Eric Dumazet | 72cdd1d | 2010-11-11 07:14:07 +0000 | [diff] [blame] | 147 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 148 | int how) |
| 149 | { |
| 150 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 152 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
| 153 | { |
David S. Miller | 0658254 | 2011-01-27 14:58:42 -0800 | [diff] [blame] | 154 | struct rtable *rt = (struct rtable *) dst; |
| 155 | struct inet_peer *peer; |
| 156 | u32 *p = NULL; |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 157 | |
David S. Miller | 0658254 | 2011-01-27 14:58:42 -0800 | [diff] [blame] | 158 | if (!rt->peer) |
| 159 | rt_bind_peer(rt, 1); |
| 160 | |
| 161 | peer = rt->peer; |
| 162 | if (peer) { |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 163 | u32 *old_p = __DST_METRICS_PTR(old); |
| 164 | unsigned long prev, new; |
| 165 | |
David S. Miller | 0658254 | 2011-01-27 14:58:42 -0800 | [diff] [blame] | 166 | p = peer->metrics; |
| 167 | if (inet_metrics_new(peer)) |
| 168 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 169 | |
| 170 | new = (unsigned long) p; |
| 171 | prev = cmpxchg(&dst->_metrics, old, new); |
| 172 | |
| 173 | if (prev != old) { |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 174 | p = __DST_METRICS_PTR(prev); |
| 175 | if (prev & DST_METRICS_READ_ONLY) |
| 176 | p = NULL; |
| 177 | } else { |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 178 | if (rt->fi) { |
| 179 | fib_info_put(rt->fi); |
| 180 | rt->fi = NULL; |
| 181 | } |
| 182 | } |
| 183 | } |
| 184 | return p; |
| 185 | } |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | static struct dst_ops ipv4_dst_ops = { |
| 188 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 189 | .protocol = cpu_to_be16(ETH_P_IP), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | .gc = rt_garbage_collect, |
| 191 | .check = ipv4_dst_check, |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 192 | .default_advmss = ipv4_default_advmss, |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 193 | .default_mtu = ipv4_default_mtu, |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 194 | .cow_metrics = ipv4_cow_metrics, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | .destroy = ipv4_dst_destroy, |
| 196 | .ifdown = ipv4_dst_ifdown, |
| 197 | .negative_advice = ipv4_negative_advice, |
| 198 | .link_failure = ipv4_link_failure, |
| 199 | .update_pmtu = ip_rt_update_pmtu, |
Herbert Xu | 1ac06e0 | 2008-05-20 14:32:14 -0700 | [diff] [blame] | 200 | .local_out = __ip_local_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | }; |
| 202 | |
| 203 | #define ECN_OR_COST(class) TC_PRIO_##class |
| 204 | |
Philippe De Muyter | 4839c52 | 2007-07-09 15:32:57 -0700 | [diff] [blame] | 205 | const __u8 ip_tos2prio[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | TC_PRIO_BESTEFFORT, |
Dan Siemon | 4a2b9c3 | 2011-03-15 13:56:07 +0000 | [diff] [blame] | 207 | ECN_OR_COST(BESTEFFORT), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | TC_PRIO_BESTEFFORT, |
| 209 | ECN_OR_COST(BESTEFFORT), |
| 210 | TC_PRIO_BULK, |
| 211 | ECN_OR_COST(BULK), |
| 212 | TC_PRIO_BULK, |
| 213 | ECN_OR_COST(BULK), |
| 214 | TC_PRIO_INTERACTIVE, |
| 215 | ECN_OR_COST(INTERACTIVE), |
| 216 | TC_PRIO_INTERACTIVE, |
| 217 | ECN_OR_COST(INTERACTIVE), |
| 218 | TC_PRIO_INTERACTIVE_BULK, |
| 219 | ECN_OR_COST(INTERACTIVE_BULK), |
| 220 | TC_PRIO_INTERACTIVE_BULK, |
| 221 | ECN_OR_COST(INTERACTIVE_BULK) |
| 222 | }; |
| 223 | |
| 224 | |
| 225 | /* |
| 226 | * Route cache. |
| 227 | */ |
| 228 | |
| 229 | /* The locking scheme is rather straight forward: |
| 230 | * |
| 231 | * 1) Read-Copy Update protects the buckets of the central route hash. |
| 232 | * 2) Only writers remove entries, and they hold the lock |
| 233 | * as they look at rtable reference counts. |
| 234 | * 3) Only readers acquire references to rtable entries, |
| 235 | * they do so with atomic increments and with the |
| 236 | * lock held. |
| 237 | */ |
| 238 | |
| 239 | struct rt_hash_bucket { |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 240 | struct rtable __rcu *chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 241 | }; |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 242 | |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 243 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) || \ |
| 244 | defined(CONFIG_PROVE_LOCKING) |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 245 | /* |
| 246 | * Instead of using one spinlock for each rt_hash_bucket, we use a table of spinlocks |
| 247 | * The size of this table is a power of two and depends on the number of CPUS. |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 248 | * (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] | 249 | */ |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 250 | #ifdef CONFIG_LOCKDEP |
| 251 | # define RT_HASH_LOCK_SZ 256 |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 252 | #else |
Ingo Molnar | 6205120 | 2006-07-03 00:24:59 -0700 | [diff] [blame] | 253 | # if NR_CPUS >= 32 |
| 254 | # define RT_HASH_LOCK_SZ 4096 |
| 255 | # elif NR_CPUS >= 16 |
| 256 | # define RT_HASH_LOCK_SZ 2048 |
| 257 | # elif NR_CPUS >= 8 |
| 258 | # define RT_HASH_LOCK_SZ 1024 |
| 259 | # elif NR_CPUS >= 4 |
| 260 | # define RT_HASH_LOCK_SZ 512 |
| 261 | # else |
| 262 | # define RT_HASH_LOCK_SZ 256 |
| 263 | # endif |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 264 | #endif |
| 265 | |
| 266 | static spinlock_t *rt_hash_locks; |
| 267 | # define rt_hash_lock_addr(slot) &rt_hash_locks[(slot) & (RT_HASH_LOCK_SZ - 1)] |
Pavel Emelyanov | 1ff1cc2 | 2007-12-05 21:15:05 -0800 | [diff] [blame] | 268 | |
| 269 | static __init void rt_hash_lock_init(void) |
| 270 | { |
| 271 | int i; |
| 272 | |
| 273 | rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, |
| 274 | GFP_KERNEL); |
| 275 | if (!rt_hash_locks) |
| 276 | panic("IP: failed to allocate rt_hash_locks\n"); |
| 277 | |
| 278 | for (i = 0; i < RT_HASH_LOCK_SZ; i++) |
| 279 | spin_lock_init(&rt_hash_locks[i]); |
| 280 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 281 | #else |
| 282 | # define rt_hash_lock_addr(slot) NULL |
Pavel Emelyanov | 1ff1cc2 | 2007-12-05 21:15:05 -0800 | [diff] [blame] | 283 | |
| 284 | static inline void rt_hash_lock_init(void) |
| 285 | { |
| 286 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 287 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Stephen Hemminger | 817bc4d | 2008-03-22 17:43:59 -0700 | [diff] [blame] | 289 | static struct rt_hash_bucket *rt_hash_table __read_mostly; |
| 290 | static unsigned rt_hash_mask __read_mostly; |
| 291 | static unsigned int rt_hash_log __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 293 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
Eric Dumazet | 27f39c7 | 2010-05-19 22:07:23 +0000 | [diff] [blame] | 294 | #define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Denis V. Lunev | b00180d | 2008-07-05 19:04:09 -0700 | [diff] [blame] | 296 | static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 297 | int genid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 299 | return jhash_3words((__force u32)daddr, (__force u32)saddr, |
Denis V. Lunev | b00180d | 2008-07-05 19:04:09 -0700 | [diff] [blame] | 300 | idx, genid) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 301 | & rt_hash_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } |
| 303 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 304 | static inline int rt_genid(struct net *net) |
| 305 | { |
| 306 | return atomic_read(&net->ipv4.rt_genid); |
| 307 | } |
| 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | #ifdef CONFIG_PROC_FS |
| 310 | struct rt_cache_iter_state { |
Denis V. Lunev | a75e936 | 2008-02-28 20:50:55 -0800 | [diff] [blame] | 311 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | int bucket; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 313 | int genid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | }; |
| 315 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 316 | static struct rtable *rt_cache_get_first(struct seq_file *seq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 318 | struct rt_cache_iter_state *st = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | struct rtable *r = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
| 321 | for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 322 | if (!rcu_dereference_raw(rt_hash_table[st->bucket].chain)) |
Eric Dumazet | a627266 | 2008-08-28 01:11:25 -0700 | [diff] [blame] | 323 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | rcu_read_lock_bh(); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 325 | r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 326 | while (r) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 327 | if (dev_net(r->dst.dev) == seq_file_net(seq) && |
Denis V. Lunev | a75e936 | 2008-02-28 20:50:55 -0800 | [diff] [blame] | 328 | r->rt_genid == st->genid) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 329 | return r; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 330 | r = rcu_dereference_bh(r->dst.rt_next); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 331 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | rcu_read_unlock_bh(); |
| 333 | } |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 334 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } |
| 336 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 337 | static struct rtable *__rt_cache_get_next(struct seq_file *seq, |
Denis V. Lunev | 642d631 | 2008-02-28 20:50:33 -0800 | [diff] [blame] | 338 | struct rtable *r) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 340 | struct rt_cache_iter_state *st = seq->private; |
Eric Dumazet | a627266 | 2008-08-28 01:11:25 -0700 | [diff] [blame] | 341 | |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 342 | r = rcu_dereference_bh(r->dst.rt_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | while (!r) { |
| 344 | rcu_read_unlock_bh(); |
Eric Dumazet | a627266 | 2008-08-28 01:11:25 -0700 | [diff] [blame] | 345 | do { |
| 346 | if (--st->bucket < 0) |
| 347 | return NULL; |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 348 | } while (!rcu_dereference_raw(rt_hash_table[st->bucket].chain)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | rcu_read_lock_bh(); |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 350 | r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 352 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 355 | static struct rtable *rt_cache_get_next(struct seq_file *seq, |
Denis V. Lunev | 642d631 | 2008-02-28 20:50:33 -0800 | [diff] [blame] | 356 | struct rtable *r) |
| 357 | { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 358 | struct rt_cache_iter_state *st = seq->private; |
| 359 | while ((r = __rt_cache_get_next(seq, r)) != NULL) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 360 | if (dev_net(r->dst.dev) != seq_file_net(seq)) |
Denis V. Lunev | a75e936 | 2008-02-28 20:50:55 -0800 | [diff] [blame] | 361 | continue; |
Denis V. Lunev | 642d631 | 2008-02-28 20:50:33 -0800 | [diff] [blame] | 362 | if (r->rt_genid == st->genid) |
| 363 | break; |
| 364 | } |
| 365 | return r; |
| 366 | } |
| 367 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 368 | static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 370 | struct rtable *r = rt_cache_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | if (r) |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 373 | while (pos && (r = rt_cache_get_next(seq, r))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | --pos; |
| 375 | return pos ? NULL : r; |
| 376 | } |
| 377 | |
| 378 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 379 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 380 | struct rt_cache_iter_state *st = seq->private; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 381 | if (*pos) |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 382 | return rt_cache_get_idx(seq, *pos - 1); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 383 | st->genid = rt_genid(seq_file_net(seq)); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 384 | return SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 388 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 389 | struct rtable *r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | if (v == SEQ_START_TOKEN) |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 392 | r = rt_cache_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | else |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 394 | r = rt_cache_get_next(seq, v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | ++*pos; |
| 396 | return r; |
| 397 | } |
| 398 | |
| 399 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 400 | { |
| 401 | if (v && v != SEQ_START_TOKEN) |
| 402 | rcu_read_unlock_bh(); |
| 403 | } |
| 404 | |
| 405 | static int rt_cache_seq_show(struct seq_file *seq, void *v) |
| 406 | { |
| 407 | if (v == SEQ_START_TOKEN) |
| 408 | seq_printf(seq, "%-127s\n", |
| 409 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" |
| 410 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" |
| 411 | "HHUptod\tSpecDst"); |
| 412 | else { |
| 413 | struct rtable *r = v; |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 414 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 416 | seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t" |
| 417 | "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 418 | r->dst.dev ? r->dst.dev->name : "*", |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 419 | (__force u32)r->rt_dst, |
| 420 | (__force u32)r->rt_gateway, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 421 | r->rt_flags, atomic_read(&r->dst.__refcnt), |
| 422 | r->dst.__use, 0, (__force u32)r->rt_src, |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 423 | dst_metric_advmss(&r->dst) + 40, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 424 | dst_metric(&r->dst, RTAX_WINDOW), |
| 425 | (int)((dst_metric(&r->dst, RTAX_RTT) >> 3) + |
| 426 | dst_metric(&r->dst, RTAX_RTTVAR)), |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 427 | r->rt_tos, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 428 | r->dst.hh ? atomic_read(&r->dst.hh->hh_refcnt) : -1, |
| 429 | r->dst.hh ? (r->dst.hh->hh_output == |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | dev_queue_xmit) : 0, |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 431 | r->rt_spec_dst, &len); |
| 432 | |
| 433 | seq_printf(seq, "%*s\n", 127 - len, ""); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 434 | } |
| 435 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 438 | static const struct seq_operations rt_cache_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | .start = rt_cache_seq_start, |
| 440 | .next = rt_cache_seq_next, |
| 441 | .stop = rt_cache_seq_stop, |
| 442 | .show = rt_cache_seq_show, |
| 443 | }; |
| 444 | |
| 445 | static int rt_cache_seq_open(struct inode *inode, struct file *file) |
| 446 | { |
Denis V. Lunev | a75e936 | 2008-02-28 20:50:55 -0800 | [diff] [blame] | 447 | return seq_open_net(inode, file, &rt_cache_seq_ops, |
Pavel Emelyanov | cf7732e | 2007-10-10 02:29:29 -0700 | [diff] [blame] | 448 | sizeof(struct rt_cache_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 451 | static const struct file_operations rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | .owner = THIS_MODULE, |
| 453 | .open = rt_cache_seq_open, |
| 454 | .read = seq_read, |
| 455 | .llseek = seq_lseek, |
Denis V. Lunev | a75e936 | 2008-02-28 20:50:55 -0800 | [diff] [blame] | 456 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | }; |
| 458 | |
| 459 | |
| 460 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 461 | { |
| 462 | int cpu; |
| 463 | |
| 464 | if (*pos == 0) |
| 465 | return SEQ_START_TOKEN; |
| 466 | |
Rusty Russell | 0f23174 | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 467 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | if (!cpu_possible(cpu)) |
| 469 | continue; |
| 470 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 471 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | } |
| 473 | return NULL; |
| 474 | } |
| 475 | |
| 476 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 477 | { |
| 478 | int cpu; |
| 479 | |
Rusty Russell | 0f23174 | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 480 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (!cpu_possible(cpu)) |
| 482 | continue; |
| 483 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 484 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
| 486 | return NULL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) |
| 491 | { |
| 492 | |
| 493 | } |
| 494 | |
| 495 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) |
| 496 | { |
| 497 | struct rt_cache_stat *st = v; |
| 498 | |
| 499 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 500 | seq_printf(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | return 0; |
| 502 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
| 505 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 506 | dst_entries_get_slow(&ipv4_dst_ops), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | st->in_hit, |
| 508 | st->in_slow_tot, |
| 509 | st->in_slow_mc, |
| 510 | st->in_no_route, |
| 511 | st->in_brd, |
| 512 | st->in_martian_dst, |
| 513 | st->in_martian_src, |
| 514 | |
| 515 | st->out_hit, |
| 516 | st->out_slow_tot, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 517 | st->out_slow_mc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | st->gc_total, |
| 520 | st->gc_ignored, |
| 521 | st->gc_goal_miss, |
| 522 | st->gc_dst_overflow, |
| 523 | st->in_hlist_search, |
| 524 | st->out_hlist_search |
| 525 | ); |
| 526 | return 0; |
| 527 | } |
| 528 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 529 | static const struct seq_operations rt_cpu_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | .start = rt_cpu_seq_start, |
| 531 | .next = rt_cpu_seq_next, |
| 532 | .stop = rt_cpu_seq_stop, |
| 533 | .show = rt_cpu_seq_show, |
| 534 | }; |
| 535 | |
| 536 | |
| 537 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) |
| 538 | { |
| 539 | return seq_open(file, &rt_cpu_seq_ops); |
| 540 | } |
| 541 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 542 | static const struct file_operations rt_cpu_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | .owner = THIS_MODULE, |
| 544 | .open = rt_cpu_seq_open, |
| 545 | .read = seq_read, |
| 546 | .llseek = seq_lseek, |
| 547 | .release = seq_release, |
| 548 | }; |
| 549 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 550 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 551 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 552 | { |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 553 | struct ip_rt_acct *dst, *src; |
| 554 | unsigned int i, j; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 555 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 556 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); |
| 557 | if (!dst) |
| 558 | return -ENOMEM; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 559 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 560 | for_each_possible_cpu(i) { |
| 561 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); |
| 562 | for (j = 0; j < 256; j++) { |
| 563 | dst[j].o_bytes += src[j].o_bytes; |
| 564 | dst[j].o_packets += src[j].o_packets; |
| 565 | dst[j].i_bytes += src[j].i_bytes; |
| 566 | dst[j].i_packets += src[j].i_packets; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 567 | } |
| 568 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 569 | |
| 570 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
| 571 | kfree(dst); |
| 572 | return 0; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 573 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 574 | |
| 575 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
| 576 | { |
| 577 | return single_open(file, rt_acct_proc_show, NULL); |
| 578 | } |
| 579 | |
| 580 | static const struct file_operations rt_acct_proc_fops = { |
| 581 | .owner = THIS_MODULE, |
| 582 | .open = rt_acct_proc_open, |
| 583 | .read = seq_read, |
| 584 | .llseek = seq_lseek, |
| 585 | .release = single_release, |
| 586 | }; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 587 | #endif |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 588 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 589 | static int __net_init ip_rt_do_proc_init(struct net *net) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 590 | { |
| 591 | struct proc_dir_entry *pde; |
| 592 | |
| 593 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, |
| 594 | &rt_cache_seq_fops); |
| 595 | if (!pde) |
| 596 | goto err1; |
| 597 | |
Wang Chen | 7702072 | 2008-02-28 14:14:25 -0800 | [diff] [blame] | 598 | pde = proc_create("rt_cache", S_IRUGO, |
| 599 | net->proc_net_stat, &rt_cpu_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 600 | if (!pde) |
| 601 | goto err2; |
| 602 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 603 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 604 | pde = proc_create("rt_acct", 0, net->proc_net, &rt_acct_proc_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 605 | if (!pde) |
| 606 | goto err3; |
| 607 | #endif |
| 608 | return 0; |
| 609 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 610 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 611 | err3: |
| 612 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 613 | #endif |
| 614 | err2: |
| 615 | remove_proc_entry("rt_cache", net->proc_net); |
| 616 | err1: |
| 617 | return -ENOMEM; |
| 618 | } |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 619 | |
| 620 | static void __net_exit ip_rt_do_proc_exit(struct net *net) |
| 621 | { |
| 622 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 623 | remove_proc_entry("rt_cache", net->proc_net); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 624 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 625 | remove_proc_entry("rt_acct", net->proc_net); |
Alexey Dobriyan | 0a931ac | 2010-01-17 03:32:50 +0000 | [diff] [blame] | 626 | #endif |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { |
| 630 | .init = ip_rt_do_proc_init, |
| 631 | .exit = ip_rt_do_proc_exit, |
| 632 | }; |
| 633 | |
| 634 | static int __init ip_rt_proc_init(void) |
| 635 | { |
| 636 | return register_pernet_subsys(&ip_rt_proc_ops); |
| 637 | } |
| 638 | |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 639 | #else |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 640 | static inline int ip_rt_proc_init(void) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 641 | { |
| 642 | return 0; |
| 643 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | #endif /* CONFIG_PROC_FS */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 645 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 646 | static inline void rt_free(struct rtable *rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 648 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | } |
| 650 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 651 | static inline void rt_drop(struct rtable *rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | ip_rt_put(rt); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 654 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
| 656 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 657 | static inline int rt_fast_clean(struct rtable *rth) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | { |
| 659 | /* Kill broadcast/multicast entries very aggresively, if they |
| 660 | collide in hash table with more useful entries */ |
| 661 | return (rth->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 662 | rt_is_input_route(rth) && rth->dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 665 | static inline int rt_valuable(struct rtable *rth) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
| 667 | return (rth->rt_flags & (RTCF_REDIRECTED | RTCF_NOTIFY)) || |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 668 | (rth->peer && rth->peer->pmtu_expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | static int rt_may_expire(struct rtable *rth, unsigned long tmo1, unsigned long tmo2) |
| 672 | { |
| 673 | unsigned long age; |
| 674 | int ret = 0; |
| 675 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 676 | if (atomic_read(&rth->dst.__refcnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | goto out; |
| 678 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 679 | age = jiffies - rth->dst.lastuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | if ((age <= tmo1 && !rt_fast_clean(rth)) || |
| 681 | (age <= tmo2 && rt_valuable(rth))) |
| 682 | goto out; |
| 683 | ret = 1; |
| 684 | out: return ret; |
| 685 | } |
| 686 | |
| 687 | /* Bits of score are: |
| 688 | * 31: very valuable |
| 689 | * 30: not quite useless |
| 690 | * 29..0: usage counter |
| 691 | */ |
| 692 | static inline u32 rt_score(struct rtable *rt) |
| 693 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 694 | u32 score = jiffies - rt->dst.lastuse; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | score = ~score & ~(3<<30); |
| 697 | |
| 698 | if (rt_valuable(rt)) |
| 699 | score |= (1<<31); |
| 700 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 701 | if (rt_is_output_route(rt) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | !(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL))) |
| 703 | score |= (1<<30); |
| 704 | |
| 705 | return score; |
| 706 | } |
| 707 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 708 | static inline bool rt_caching(const struct net *net) |
| 709 | { |
| 710 | return net->ipv4.current_rt_cache_rebuild_count <= |
| 711 | net->ipv4.sysctl_rt_cache_rebuild_count; |
| 712 | } |
| 713 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 714 | static inline bool compare_hash_inputs(const struct rtable *rt1, |
| 715 | const struct rtable *rt2) |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 716 | { |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 717 | return ((((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) | |
| 718 | ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | |
| 719 | (rt1->rt_iif ^ rt2->rt_iif)) == 0); |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 720 | } |
| 721 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 722 | static inline int compare_keys(struct rtable *rt1, struct rtable *rt2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | { |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 724 | return (((__force u32)rt1->rt_key_dst ^ (__force u32)rt2->rt_key_dst) | |
| 725 | ((__force u32)rt1->rt_key_src ^ (__force u32)rt2->rt_key_src) | |
| 726 | (rt1->rt_mark ^ rt2->rt_mark) | |
| 727 | (rt1->rt_tos ^ rt2->rt_tos) | |
| 728 | (rt1->rt_oif ^ rt2->rt_oif) | |
| 729 | (rt1->rt_iif ^ rt2->rt_iif)) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 732 | static inline int compare_netns(struct rtable *rt1, struct rtable *rt2) |
| 733 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 734 | return net_eq(dev_net(rt1->dst.dev), dev_net(rt2->dst.dev)); |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 735 | } |
| 736 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 737 | static inline int rt_is_expired(struct rtable *rth) |
| 738 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 739 | return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 742 | /* |
| 743 | * Perform a full scan of hash table and free all entries. |
| 744 | * Can be called by a softirq or a process. |
| 745 | * In the later case, we want to be reschedule if necessary |
| 746 | */ |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 747 | static void rt_do_flush(struct net *net, int process_context) |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 748 | { |
| 749 | unsigned int i; |
| 750 | struct rtable *rth, *next; |
| 751 | |
| 752 | for (i = 0; i <= rt_hash_mask; i++) { |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 753 | struct rtable __rcu **pprev; |
| 754 | struct rtable *list; |
| 755 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 756 | if (process_context && need_resched()) |
| 757 | cond_resched(); |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 758 | rth = rcu_dereference_raw(rt_hash_table[i].chain); |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 759 | if (!rth) |
| 760 | continue; |
| 761 | |
| 762 | spin_lock_bh(rt_hash_lock_addr(i)); |
Denis V. Lunev | 32cb5b4 | 2008-07-05 19:06:12 -0700 | [diff] [blame] | 763 | |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 764 | list = NULL; |
| 765 | pprev = &rt_hash_table[i].chain; |
| 766 | rth = rcu_dereference_protected(*pprev, |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 767 | lockdep_is_held(rt_hash_lock_addr(i))); |
Denis V. Lunev | 32cb5b4 | 2008-07-05 19:06:12 -0700 | [diff] [blame] | 768 | |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 769 | while (rth) { |
| 770 | next = rcu_dereference_protected(rth->dst.rt_next, |
| 771 | lockdep_is_held(rt_hash_lock_addr(i))); |
Denis V. Lunev | 32cb5b4 | 2008-07-05 19:06:12 -0700 | [diff] [blame] | 772 | |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 773 | if (!net || |
| 774 | net_eq(dev_net(rth->dst.dev), net)) { |
| 775 | rcu_assign_pointer(*pprev, next); |
| 776 | rcu_assign_pointer(rth->dst.rt_next, list); |
| 777 | list = rth; |
Denis V. Lunev | 32cb5b4 | 2008-07-05 19:06:12 -0700 | [diff] [blame] | 778 | } else { |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 779 | pprev = &rth->dst.rt_next; |
Denis V. Lunev | 32cb5b4 | 2008-07-05 19:06:12 -0700 | [diff] [blame] | 780 | } |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 781 | rth = next; |
Denis V. Lunev | 32cb5b4 | 2008-07-05 19:06:12 -0700 | [diff] [blame] | 782 | } |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 783 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 784 | spin_unlock_bh(rt_hash_lock_addr(i)); |
| 785 | |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 786 | for (; list; list = next) { |
| 787 | next = rcu_dereference_protected(list->dst.rt_next, 1); |
| 788 | rt_free(list); |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 789 | } |
| 790 | } |
| 791 | } |
| 792 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 793 | /* |
| 794 | * While freeing expired entries, we compute average chain length |
| 795 | * and standard deviation, using fixed-point arithmetic. |
| 796 | * This to have an estimation of rt_chain_length_max |
| 797 | * rt_chain_length_max = max(elasticity, AVG + 4*SD) |
| 798 | * We use 3 bits for frational part, and 29 (or 61) for magnitude. |
| 799 | */ |
| 800 | |
| 801 | #define FRACT_BITS 3 |
| 802 | #define ONE (1UL << FRACT_BITS) |
| 803 | |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 804 | /* |
| 805 | * Given a hash chain and an item in this hash chain, |
| 806 | * find if a previous entry has the same hash_inputs |
| 807 | * (but differs on tos, mark or oif) |
| 808 | * Returns 0 if an alias is found. |
| 809 | * Returns ONE if rth has no alias before itself. |
| 810 | */ |
| 811 | static int has_noalias(const struct rtable *head, const struct rtable *rth) |
| 812 | { |
| 813 | const struct rtable *aux = head; |
| 814 | |
| 815 | while (aux != rth) { |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 816 | if (compare_hash_inputs(aux, rth)) |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 817 | return 0; |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 818 | aux = rcu_dereference_protected(aux->dst.rt_next, 1); |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 819 | } |
| 820 | return ONE; |
| 821 | } |
| 822 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 823 | /* |
| 824 | * Pertubation of rt_genid by a small quantity [1..256] |
| 825 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() |
| 826 | * many times (2^24) without giving recent rt_genid. |
| 827 | * Jenkins hash is strong enough that litle changes of rt_genid are OK. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | */ |
Denis V. Lunev | 86c657f | 2008-07-05 19:03:31 -0700 | [diff] [blame] | 829 | static void rt_cache_invalidate(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 831 | unsigned char shuffle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 833 | get_random_bytes(&shuffle, sizeof(shuffle)); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 834 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 837 | /* |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 838 | * delay < 0 : invalidate cache (fast : entries will be deleted later) |
| 839 | * delay >= 0 : invalidate & flush cache (can be long) |
| 840 | */ |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 841 | void rt_cache_flush(struct net *net, int delay) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 842 | { |
Denis V. Lunev | 86c657f | 2008-07-05 19:03:31 -0700 | [diff] [blame] | 843 | rt_cache_invalidate(net); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 844 | if (delay >= 0) |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 845 | rt_do_flush(net, !in_softirq()); |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 846 | } |
| 847 | |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 848 | /* Flush previous cache invalidated entries from the cache */ |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 849 | void rt_cache_flush_batch(struct net *net) |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 850 | { |
David S. Miller | 6561a3b | 2010-12-19 21:11:20 -0800 | [diff] [blame] | 851 | rt_do_flush(net, !in_softirq()); |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 852 | } |
| 853 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 854 | static void rt_emergency_hash_rebuild(struct net *net) |
| 855 | { |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 856 | if (net_ratelimit()) |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 857 | printk(KERN_WARNING "Route hash chain too long!\n"); |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 858 | rt_cache_invalidate(net); |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 859 | } |
| 860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | /* |
| 862 | Short description of GC goals. |
| 863 | |
| 864 | We want to build algorithm, which will keep routing cache |
| 865 | at some equilibrium point, when number of aged off entries |
| 866 | is kept approximately equal to newly generated ones. |
| 867 | |
| 868 | Current expiration strength is variable "expire". |
| 869 | We try to adjust it dynamically, so that if networking |
| 870 | is idle expires is large enough to keep enough of warm entries, |
| 871 | and when load increases it reduces to limit cache size. |
| 872 | */ |
| 873 | |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 874 | static int rt_garbage_collect(struct dst_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | { |
| 876 | static unsigned long expire = RT_GC_TIMEOUT; |
| 877 | static unsigned long last_gc; |
| 878 | static int rover; |
| 879 | static int equilibrium; |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 880 | struct rtable *rth; |
| 881 | struct rtable __rcu **rthp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | unsigned long now = jiffies; |
| 883 | int goal; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 884 | int entries = dst_entries_get_fast(&ipv4_dst_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | /* |
| 887 | * Garbage collection is pretty expensive, |
| 888 | * do not make it too frequently. |
| 889 | */ |
| 890 | |
| 891 | RT_CACHE_STAT_INC(gc_total); |
| 892 | |
| 893 | if (now - last_gc < ip_rt_gc_min_interval && |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 894 | entries < ip_rt_max_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | RT_CACHE_STAT_INC(gc_ignored); |
| 896 | goto out; |
| 897 | } |
| 898 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 899 | entries = dst_entries_get_slow(&ipv4_dst_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | /* Calculate number of entries, which we want to expire now. */ |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 901 | goal = entries - (ip_rt_gc_elasticity << rt_hash_log); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | if (goal <= 0) { |
| 903 | if (equilibrium < ipv4_dst_ops.gc_thresh) |
| 904 | equilibrium = ipv4_dst_ops.gc_thresh; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 905 | goal = entries - equilibrium; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | if (goal > 0) { |
Eric Dumazet | b790ced | 2007-12-21 01:49:07 -0800 | [diff] [blame] | 907 | equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 908 | goal = entries - equilibrium; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
| 910 | } else { |
| 911 | /* We are in dangerous area. Try to reduce cache really |
| 912 | * aggressively. |
| 913 | */ |
Eric Dumazet | b790ced | 2007-12-21 01:49:07 -0800 | [diff] [blame] | 914 | goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1); |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 915 | equilibrium = entries - goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | if (now - last_gc >= ip_rt_gc_min_interval) |
| 919 | last_gc = now; |
| 920 | |
| 921 | if (goal <= 0) { |
| 922 | equilibrium += goal; |
| 923 | goto work_done; |
| 924 | } |
| 925 | |
| 926 | do { |
| 927 | int i, k; |
| 928 | |
| 929 | for (i = rt_hash_mask, k = rover; i >= 0; i--) { |
| 930 | unsigned long tmo = expire; |
| 931 | |
| 932 | k = (k + 1) & rt_hash_mask; |
| 933 | rthp = &rt_hash_table[k].chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 934 | spin_lock_bh(rt_hash_lock_addr(k)); |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 935 | while ((rth = rcu_dereference_protected(*rthp, |
| 936 | lockdep_is_held(rt_hash_lock_addr(k)))) != NULL) { |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 937 | if (!rt_is_expired(rth) && |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 938 | !rt_may_expire(rth, tmo, expire)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | tmo >>= 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 940 | rthp = &rth->dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | continue; |
| 942 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 943 | *rthp = rth->dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | rt_free(rth); |
| 945 | goal--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 947 | spin_unlock_bh(rt_hash_lock_addr(k)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | if (goal <= 0) |
| 949 | break; |
| 950 | } |
| 951 | rover = k; |
| 952 | |
| 953 | if (goal <= 0) |
| 954 | goto work_done; |
| 955 | |
| 956 | /* Goal is not achieved. We stop process if: |
| 957 | |
| 958 | - if expire reduced to zero. Otherwise, expire is halfed. |
| 959 | - if table is not full. |
| 960 | - if we are called from interrupt. |
| 961 | - jiffies check is just fallback/debug loop breaker. |
| 962 | We will not spin here for long time in any case. |
| 963 | */ |
| 964 | |
| 965 | RT_CACHE_STAT_INC(gc_goal_miss); |
| 966 | |
| 967 | if (expire == 0) |
| 968 | break; |
| 969 | |
| 970 | expire >>= 1; |
| 971 | #if RT_CACHE_DEBUG >= 2 |
| 972 | printk(KERN_DEBUG "expire>> %u %d %d %d\n", expire, |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 973 | dst_entries_get_fast(&ipv4_dst_ops), goal, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | #endif |
| 975 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 976 | if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | goto out; |
| 978 | } while (!in_softirq() && time_before_eq(jiffies, now)); |
| 979 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 980 | if (dst_entries_get_fast(&ipv4_dst_ops) < ip_rt_max_size) |
| 981 | goto out; |
| 982 | if (dst_entries_get_slow(&ipv4_dst_ops) < ip_rt_max_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | goto out; |
| 984 | if (net_ratelimit()) |
| 985 | printk(KERN_WARNING "dst cache overflow\n"); |
| 986 | RT_CACHE_STAT_INC(gc_dst_overflow); |
| 987 | return 1; |
| 988 | |
| 989 | work_done: |
| 990 | expire += ip_rt_gc_min_interval; |
| 991 | if (expire > ip_rt_gc_timeout || |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 992 | dst_entries_get_fast(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh || |
| 993 | dst_entries_get_slow(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | expire = ip_rt_gc_timeout; |
| 995 | #if RT_CACHE_DEBUG >= 2 |
| 996 | printk(KERN_DEBUG "expire++ %u %d %d %d\n", expire, |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 997 | dst_entries_get_fast(&ipv4_dst_ops), goal, rover); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | #endif |
| 999 | out: return 0; |
| 1000 | } |
| 1001 | |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 1002 | /* |
| 1003 | * Returns number of entries in a hash chain that have different hash_inputs |
| 1004 | */ |
| 1005 | static int slow_chain_length(const struct rtable *head) |
| 1006 | { |
| 1007 | int length = 0; |
| 1008 | const struct rtable *rth = head; |
| 1009 | |
| 1010 | while (rth) { |
| 1011 | length += has_noalias(head, rth); |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 1012 | rth = rcu_dereference_protected(rth->dst.rt_next, 1); |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 1013 | } |
| 1014 | return length >> FRACT_BITS; |
| 1015 | } |
| 1016 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1017 | static struct rtable *rt_intern_hash(unsigned hash, struct rtable *rt, |
| 1018 | struct sk_buff *skb, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | { |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 1020 | struct rtable *rth, *cand; |
| 1021 | struct rtable __rcu **rthp, **candp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | unsigned long now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | u32 min_score; |
| 1024 | int chain_length; |
| 1025 | int attempts = !in_softirq(); |
| 1026 | |
| 1027 | restart: |
| 1028 | chain_length = 0; |
| 1029 | min_score = ~(u32)0; |
| 1030 | cand = NULL; |
| 1031 | candp = NULL; |
| 1032 | now = jiffies; |
| 1033 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1034 | if (!rt_caching(dev_net(rt->dst.dev))) { |
Neil Horman | 73e4289 | 2009-06-20 01:15:16 -0700 | [diff] [blame] | 1035 | /* |
| 1036 | * If we're not caching, just tell the caller we |
| 1037 | * were successful and don't touch the route. The |
| 1038 | * caller hold the sole reference to the cache entry, and |
| 1039 | * it will be released when the caller is done with it. |
| 1040 | * If we drop it here, the callers have no way to resolve routes |
| 1041 | * when we're not caching. Instead, just point *rp at rt, so |
| 1042 | * the caller gets a single use out of the route |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1043 | * Note that we do rt_free on this new route entry, so that |
| 1044 | * once its refcount hits zero, we are still able to reap it |
| 1045 | * (Thanks Alexey) |
Eric Dumazet | 27b75c9 | 2010-10-15 05:44:11 +0000 | [diff] [blame] | 1046 | * Note: To avoid expensive rcu stuff for this uncached dst, |
| 1047 | * we set DST_NOCACHE so that dst_release() can free dst without |
| 1048 | * waiting a grace period. |
Neil Horman | 73e4289 | 2009-06-20 01:15:16 -0700 | [diff] [blame] | 1049 | */ |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1050 | |
Eric Dumazet | c7d4426 | 2010-10-03 22:17:54 -0700 | [diff] [blame] | 1051 | rt->dst.flags |= DST_NOCACHE; |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1052 | if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1053 | int err = arp_bind_neighbour(&rt->dst); |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1054 | if (err) { |
| 1055 | if (net_ratelimit()) |
| 1056 | printk(KERN_WARNING |
| 1057 | "Neighbour table failure & not caching routes.\n"); |
Eric Dumazet | 27b75c9 | 2010-10-15 05:44:11 +0000 | [diff] [blame] | 1058 | ip_rt_put(rt); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1059 | return ERR_PTR(err); |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1060 | } |
| 1061 | } |
| 1062 | |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1063 | goto skip_hashing; |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1064 | } |
| 1065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | rthp = &rt_hash_table[hash].chain; |
| 1067 | |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1068 | spin_lock_bh(rt_hash_lock_addr(hash)); |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 1069 | while ((rth = rcu_dereference_protected(*rthp, |
| 1070 | lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) { |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1071 | if (rt_is_expired(rth)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1072 | *rthp = rth->dst.rt_next; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1073 | rt_free(rth); |
| 1074 | continue; |
| 1075 | } |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1076 | if (compare_keys(rth, rt) && compare_netns(rth, rt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | /* Put it first */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1078 | *rthp = rth->dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | /* |
| 1080 | * Since lookup is lockfree, the deletion |
| 1081 | * must be visible to another weakly ordered CPU before |
| 1082 | * the insertion at the start of the hash chain. |
| 1083 | */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1084 | rcu_assign_pointer(rth->dst.rt_next, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | rt_hash_table[hash].chain); |
| 1086 | /* |
| 1087 | * Since lookup is lockfree, the update writes |
| 1088 | * must be ordered for consistency on SMP. |
| 1089 | */ |
| 1090 | rcu_assign_pointer(rt_hash_table[hash].chain, rth); |
| 1091 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1092 | dst_use(&rth->dst, now); |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1093 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
| 1095 | rt_drop(rt); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1096 | if (skb) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1097 | skb_dst_set(skb, &rth->dst); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1098 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | } |
| 1100 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1101 | if (!atomic_read(&rth->dst.__refcnt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | u32 score = rt_score(rth); |
| 1103 | |
| 1104 | if (score <= min_score) { |
| 1105 | cand = rth; |
| 1106 | candp = rthp; |
| 1107 | min_score = score; |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | chain_length++; |
| 1112 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1113 | rthp = &rth->dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |
| 1115 | |
| 1116 | if (cand) { |
| 1117 | /* ip_rt_gc_elasticity used to be average length of chain |
| 1118 | * length, when exceeded gc becomes really aggressive. |
| 1119 | * |
| 1120 | * The second limit is less certain. At the moment it allows |
| 1121 | * only 2 entries per bucket. We will see. |
| 1122 | */ |
| 1123 | if (chain_length > ip_rt_gc_elasticity) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1124 | *candp = cand->dst.rt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | rt_free(cand); |
| 1126 | } |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1127 | } else { |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 1128 | if (chain_length > rt_chain_length_max && |
| 1129 | slow_chain_length(rt_hash_table[hash].chain) > rt_chain_length_max) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1130 | struct net *net = dev_net(rt->dst.dev); |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1131 | int num = ++net->ipv4.current_rt_cache_rebuild_count; |
Pavel Emelyanov | b35ecb5 | 2010-03-24 07:43:17 +0000 | [diff] [blame] | 1132 | if (!rt_caching(net)) { |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1133 | printk(KERN_WARNING "%s: %d rebuilds is over limit, route caching disabled\n", |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1134 | rt->dst.dev->name, num); |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1135 | } |
Pavel Emelyanov | b35ecb5 | 2010-03-24 07:43:17 +0000 | [diff] [blame] | 1136 | rt_emergency_hash_rebuild(net); |
Pavel Emelyanov | 6a2bad7 | 2010-03-24 21:51:22 +0000 | [diff] [blame] | 1137 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
| 1138 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1139 | hash = rt_hash(rt->rt_key_dst, rt->rt_key_src, |
Pavel Emelyanov | 6a2bad7 | 2010-03-24 21:51:22 +0000 | [diff] [blame] | 1140 | ifindex, rt_genid(net)); |
| 1141 | goto restart; |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1142 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | } |
| 1144 | |
| 1145 | /* Try to bind route to arp only if it is output |
| 1146 | route or unicast forwarding path. |
| 1147 | */ |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1148 | if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1149 | int err = arp_bind_neighbour(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | if (err) { |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1151 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | |
| 1153 | if (err != -ENOBUFS) { |
| 1154 | rt_drop(rt); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1155 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | } |
| 1157 | |
| 1158 | /* Neighbour tables are full and nothing |
| 1159 | can be released. Try to shrink route cache, |
| 1160 | it is most likely it holds some neighbour records. |
| 1161 | */ |
| 1162 | if (attempts-- > 0) { |
| 1163 | int saved_elasticity = ip_rt_gc_elasticity; |
| 1164 | int saved_int = ip_rt_gc_min_interval; |
| 1165 | ip_rt_gc_elasticity = 1; |
| 1166 | ip_rt_gc_min_interval = 0; |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 1167 | rt_garbage_collect(&ipv4_dst_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | ip_rt_gc_min_interval = saved_int; |
| 1169 | ip_rt_gc_elasticity = saved_elasticity; |
| 1170 | goto restart; |
| 1171 | } |
| 1172 | |
| 1173 | if (net_ratelimit()) |
Ulrich Weber | 7e1b33e | 2010-09-27 15:02:18 -0700 | [diff] [blame] | 1174 | printk(KERN_WARNING "ipv4: Neighbour table overflow.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | rt_drop(rt); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1176 | return ERR_PTR(-ENOBUFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | } |
| 1178 | } |
| 1179 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1180 | rt->dst.rt_next = rt_hash_table[hash].chain; |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | #if RT_CACHE_DEBUG >= 2 |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1183 | if (rt->dst.rt_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | struct rtable *trt; |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1185 | printk(KERN_DEBUG "rt_cache @%02x: %pI4", |
| 1186 | hash, &rt->rt_dst); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1187 | for (trt = rt->dst.rt_next; trt; trt = trt->dst.rt_next) |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1188 | printk(" . %pI4", &trt->rt_dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | printk("\n"); |
| 1190 | } |
| 1191 | #endif |
Eric Dumazet | 00269b5 | 2008-10-16 14:18:29 -0700 | [diff] [blame] | 1192 | /* |
| 1193 | * Since lookup is lockfree, we must make sure |
| 1194 | * previous writes to rt are comitted to memory |
| 1195 | * before making rt visible to other CPUS. |
| 1196 | */ |
Eric Dumazet | 1ddbcb0 | 2009-05-19 20:14:28 +0000 | [diff] [blame] | 1197 | rcu_assign_pointer(rt_hash_table[hash].chain, rt); |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 1198 | |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1199 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Neil Horman | 73e4289 | 2009-06-20 01:15:16 -0700 | [diff] [blame] | 1200 | |
Neil Horman | b6280b4 | 2009-06-22 10:18:53 +0000 | [diff] [blame] | 1201 | skip_hashing: |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1202 | if (skb) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1203 | skb_dst_set(skb, &rt->dst); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1204 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | } |
| 1206 | |
David S. Miller | 6431cbc | 2011-02-07 20:38:06 -0800 | [diff] [blame] | 1207 | static atomic_t __rt_peer_genid = ATOMIC_INIT(0); |
| 1208 | |
| 1209 | static u32 rt_peer_genid(void) |
| 1210 | { |
| 1211 | return atomic_read(&__rt_peer_genid); |
| 1212 | } |
| 1213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | void rt_bind_peer(struct rtable *rt, int create) |
| 1215 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | struct inet_peer *peer; |
| 1217 | |
David S. Miller | b534ecf | 2010-11-30 11:54:19 -0800 | [diff] [blame] | 1218 | peer = inet_getpeer_v4(rt->rt_dst, create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
Eric Dumazet | 49e8ab0 | 2010-08-19 06:10:45 +0000 | [diff] [blame] | 1220 | if (peer && cmpxchg(&rt->peer, NULL, peer) != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | inet_putpeer(peer); |
David S. Miller | 6431cbc | 2011-02-07 20:38:06 -0800 | [diff] [blame] | 1222 | else |
| 1223 | rt->rt_peer_genid = rt_peer_genid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | } |
| 1225 | |
| 1226 | /* |
| 1227 | * Peer allocation may fail only in serious out-of-memory conditions. However |
| 1228 | * we still can generate some output. |
| 1229 | * Random ID selection looks a bit dangerous because we have no chances to |
| 1230 | * select ID being unique in a reasonable period of time. |
| 1231 | * But broken packet identifier may be better than no packet at all. |
| 1232 | */ |
| 1233 | static void ip_select_fb_ident(struct iphdr *iph) |
| 1234 | { |
| 1235 | static DEFINE_SPINLOCK(ip_fb_id_lock); |
| 1236 | static u32 ip_fallback_id; |
| 1237 | u32 salt; |
| 1238 | |
| 1239 | spin_lock_bh(&ip_fb_id_lock); |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 1240 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | iph->id = htons(salt & 0xFFFF); |
| 1242 | ip_fallback_id = salt; |
| 1243 | spin_unlock_bh(&ip_fb_id_lock); |
| 1244 | } |
| 1245 | |
| 1246 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) |
| 1247 | { |
| 1248 | struct rtable *rt = (struct rtable *) dst; |
| 1249 | |
| 1250 | if (rt) { |
| 1251 | if (rt->peer == NULL) |
| 1252 | rt_bind_peer(rt, 1); |
| 1253 | |
| 1254 | /* If peer is attached to destination, it is never detached, |
| 1255 | so that we need not to grab a lock to dereference it. |
| 1256 | */ |
| 1257 | if (rt->peer) { |
| 1258 | iph->id = htons(inet_getid(rt->peer, more)); |
| 1259 | return; |
| 1260 | } |
| 1261 | } else |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1262 | printk(KERN_DEBUG "rt_bind_peer(0) @%p\n", |
Stephen Hemminger | 9c2b332 | 2005-04-19 22:39:42 -0700 | [diff] [blame] | 1263 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | |
| 1265 | ip_select_fb_ident(iph); |
| 1266 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1267 | EXPORT_SYMBOL(__ip_select_ident); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
| 1269 | static void rt_del(unsigned hash, struct rtable *rt) |
| 1270 | { |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 1271 | struct rtable __rcu **rthp; |
| 1272 | struct rtable *aux; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1274 | rthp = &rt_hash_table[hash].chain; |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1275 | spin_lock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | ip_rt_put(rt); |
Eric Dumazet | 1c31720 | 2010-10-25 21:02:07 +0000 | [diff] [blame] | 1277 | while ((aux = rcu_dereference_protected(*rthp, |
| 1278 | lockdep_is_held(rt_hash_lock_addr(hash)))) != NULL) { |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1279 | if (aux == rt || rt_is_expired(aux)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1280 | *rthp = aux->dst.rt_next; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1281 | rt_free(aux); |
| 1282 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1284 | rthp = &aux->dst.rt_next; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1285 | } |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 1286 | spin_unlock_bh(rt_hash_lock_addr(hash)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | } |
| 1288 | |
Eric Dumazet | ed7865a4 | 2010-06-07 21:49:44 -0700 | [diff] [blame] | 1289 | /* called in rcu_read_lock() section */ |
Al Viro | f765522 | 2006-09-26 21:25:43 -0700 | [diff] [blame] | 1290 | void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw, |
| 1291 | __be32 saddr, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | { |
Eric Dumazet | ed7865a4 | 2010-06-07 21:49:44 -0700 | [diff] [blame] | 1293 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1294 | struct inet_peer *peer; |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 1295 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | if (!in_dev) |
| 1298 | return; |
| 1299 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1300 | net = dev_net(dev); |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 1301 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
| 1302 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || |
| 1303 | ipv4_is_zeronet(new_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | goto reject_redirect; |
| 1305 | |
| 1306 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
| 1307 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) |
| 1308 | goto reject_redirect; |
| 1309 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) |
| 1310 | goto reject_redirect; |
| 1311 | } else { |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 1312 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | goto reject_redirect; |
| 1314 | } |
| 1315 | |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1316 | peer = inet_getpeer_v4(daddr, 1); |
| 1317 | if (peer) { |
| 1318 | peer->redirect_learned.a4 = new_gw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1320 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1322 | atomic_inc(&__rt_peer_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | return; |
| 1325 | |
| 1326 | reject_redirect: |
| 1327 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1328 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1329 | printk(KERN_INFO "Redirect from %pI4 on %s about %pI4 ignored.\n" |
| 1330 | " Advised path = %pI4 -> %pI4\n", |
| 1331 | &old_gw, dev->name, &new_gw, |
| 1332 | &saddr, &daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | #endif |
Eric Dumazet | ed7865a4 | 2010-06-07 21:49:44 -0700 | [diff] [blame] | 1334 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | } |
| 1336 | |
| 1337 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
| 1338 | { |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 1339 | struct rtable *rt = (struct rtable *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | struct dst_entry *ret = dst; |
| 1341 | |
| 1342 | if (rt) { |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 1343 | if (dst->obsolete > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | ip_rt_put(rt); |
| 1345 | ret = NULL; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1346 | } else if (rt->rt_flags & RTCF_REDIRECTED) { |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1347 | unsigned hash = rt_hash(rt->rt_key_dst, rt->rt_key_src, |
| 1348 | rt->rt_oif, |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1349 | rt_genid(dev_net(dst->dev))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | #if RT_CACHE_DEBUG >= 1 |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1351 | printk(KERN_DEBUG "ipv4_negative_advice: redirect to %pI4/%02x dropped\n", |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1352 | &rt->rt_dst, rt->rt_tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | #endif |
| 1354 | rt_del(hash, rt); |
| 1355 | ret = NULL; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1356 | } else if (rt->peer && |
| 1357 | rt->peer->pmtu_expires && |
| 1358 | time_after_eq(jiffies, rt->peer->pmtu_expires)) { |
| 1359 | unsigned long orig = rt->peer->pmtu_expires; |
| 1360 | |
| 1361 | if (cmpxchg(&rt->peer->pmtu_expires, orig, 0) == orig) |
| 1362 | dst_metric_set(dst, RTAX_MTU, |
| 1363 | rt->peer->pmtu_orig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | } |
| 1365 | } |
| 1366 | return ret; |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * Algorithm: |
| 1371 | * 1. The first ip_rt_redirect_number redirects are sent |
| 1372 | * with exponential backoff, then we stop sending them at all, |
| 1373 | * assuming that the host ignores our redirects. |
| 1374 | * 2. If we did not see packets requiring redirects |
| 1375 | * during ip_rt_redirect_silence, we assume that the host |
| 1376 | * forgot redirected route and start to send redirects again. |
| 1377 | * |
| 1378 | * This algorithm is much cheaper and more intelligent than dumb load limiting |
| 1379 | * in icmp.c. |
| 1380 | * |
| 1381 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) |
| 1382 | * and "frag. need" (breaks PMTU discovery) in icmp.c. |
| 1383 | */ |
| 1384 | |
| 1385 | void ip_rt_send_redirect(struct sk_buff *skb) |
| 1386 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1387 | struct rtable *rt = skb_rtable(skb); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1388 | struct in_device *in_dev; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1389 | struct inet_peer *peer; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1390 | int log_martians; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1392 | rcu_read_lock(); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1393 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1394 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
| 1395 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | return; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1397 | } |
| 1398 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); |
| 1399 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1401 | if (!rt->peer) |
| 1402 | rt_bind_peer(rt, 1); |
| 1403 | peer = rt->peer; |
| 1404 | if (!peer) { |
| 1405 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
| 1406 | return; |
| 1407 | } |
| 1408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | /* No redirected packets during ip_rt_redirect_silence; |
| 1410 | * reset the algorithm. |
| 1411 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1412 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
| 1413 | peer->rate_tokens = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | |
| 1415 | /* Too many ignored redirects; do not send anything |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1416 | * set dst.rate_last to the last seen redirected packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1418 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
| 1419 | peer->rate_last = jiffies; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1420 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | } |
| 1422 | |
| 1423 | /* Check for load limit; set rate_last to the latest sent |
| 1424 | * redirect. |
| 1425 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1426 | if (peer->rate_tokens == 0 || |
Li Yewang | 14fb8a7 | 2006-12-18 00:26:35 -0800 | [diff] [blame] | 1427 | time_after(jiffies, |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1428 | (peer->rate_last + |
| 1429 | (ip_rt_redirect_load << peer->rate_tokens)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1431 | peer->rate_last = jiffies; |
| 1432 | ++peer->rate_tokens; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 1434 | if (log_martians && |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1435 | peer->rate_tokens == ip_rt_redirect_number && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | net_ratelimit()) |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1437 | printk(KERN_WARNING "host %pI4/if%d ignores redirects for %pI4 to %pI4.\n", |
| 1438 | &rt->rt_src, rt->rt_iif, |
| 1439 | &rt->rt_dst, &rt->rt_gateway); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | #endif |
| 1441 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | } |
| 1443 | |
| 1444 | static int ip_error(struct sk_buff *skb) |
| 1445 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1446 | struct rtable *rt = skb_rtable(skb); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1447 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | unsigned long now; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1449 | bool send; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | int code; |
| 1451 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1452 | switch (rt->dst.error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | case EINVAL: |
| 1454 | default: |
| 1455 | goto out; |
| 1456 | case EHOSTUNREACH: |
| 1457 | code = ICMP_HOST_UNREACH; |
| 1458 | break; |
| 1459 | case ENETUNREACH: |
| 1460 | code = ICMP_NET_UNREACH; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1461 | IP_INC_STATS_BH(dev_net(rt->dst.dev), |
Pavel Emelyanov | 7c73a6f | 2008-07-16 20:20:11 -0700 | [diff] [blame] | 1462 | IPSTATS_MIB_INNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | break; |
| 1464 | case EACCES: |
| 1465 | code = ICMP_PKT_FILTERED; |
| 1466 | break; |
| 1467 | } |
| 1468 | |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1469 | if (!rt->peer) |
| 1470 | rt_bind_peer(rt, 1); |
| 1471 | peer = rt->peer; |
| 1472 | |
| 1473 | send = true; |
| 1474 | if (peer) { |
| 1475 | now = jiffies; |
| 1476 | peer->rate_tokens += now - peer->rate_last; |
| 1477 | if (peer->rate_tokens > ip_rt_error_burst) |
| 1478 | peer->rate_tokens = ip_rt_error_burst; |
| 1479 | peer->rate_last = now; |
| 1480 | if (peer->rate_tokens >= ip_rt_error_cost) |
| 1481 | peer->rate_tokens -= ip_rt_error_cost; |
| 1482 | else |
| 1483 | send = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | } |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 1485 | if (send) |
| 1486 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
| 1488 | out: kfree_skb(skb); |
| 1489 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1490 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
| 1492 | /* |
| 1493 | * The last two values are not from the RFC but |
| 1494 | * are needed for AMPRnet AX.25 paths. |
| 1495 | */ |
| 1496 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1497 | static const unsigned short mtu_plateau[] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | {32000, 17914, 8166, 4352, 2002, 1492, 576, 296, 216, 128 }; |
| 1499 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1500 | static inline unsigned short guess_mtu(unsigned short old_mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | { |
| 1502 | int i; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | for (i = 0; i < ARRAY_SIZE(mtu_plateau); i++) |
| 1505 | if (old_mtu > mtu_plateau[i]) |
| 1506 | return mtu_plateau[i]; |
| 1507 | return 68; |
| 1508 | } |
| 1509 | |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 1510 | unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, |
Timo Teras | 0010e46 | 2008-04-29 03:32:25 -0700 | [diff] [blame] | 1511 | unsigned short new_mtu, |
| 1512 | struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | unsigned short old_mtu = ntohs(iph->tot_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | unsigned short est_mtu = 0; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1516 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1518 | peer = inet_getpeer_v4(iph->daddr, 1); |
| 1519 | if (peer) { |
| 1520 | unsigned short mtu = new_mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1522 | if (new_mtu < 68 || new_mtu >= old_mtu) { |
| 1523 | /* BSD 4.2 derived systems incorrectly adjust |
| 1524 | * tot_len by the IP header length, and report |
| 1525 | * a zero MTU in the ICMP message. |
| 1526 | */ |
| 1527 | if (mtu == 0 && |
| 1528 | old_mtu >= 68 + (iph->ihl << 2)) |
| 1529 | old_mtu -= iph->ihl << 2; |
| 1530 | mtu = guess_mtu(old_mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | } |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1532 | |
| 1533 | if (mtu < ip_rt_min_pmtu) |
| 1534 | mtu = ip_rt_min_pmtu; |
| 1535 | if (!peer->pmtu_expires || mtu < peer->pmtu_learned) { |
Hiroaki SHIMODA | 46af318 | 2011-03-09 20:09:58 +0000 | [diff] [blame] | 1536 | unsigned long pmtu_expires; |
| 1537 | |
| 1538 | pmtu_expires = jiffies + ip_rt_mtu_expires; |
| 1539 | if (!pmtu_expires) |
| 1540 | pmtu_expires = 1UL; |
| 1541 | |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1542 | est_mtu = mtu; |
| 1543 | peer->pmtu_learned = mtu; |
Hiroaki SHIMODA | 46af318 | 2011-03-09 20:09:58 +0000 | [diff] [blame] | 1544 | peer->pmtu_expires = pmtu_expires; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | inet_putpeer(peer); |
| 1548 | |
| 1549 | atomic_inc(&__rt_peer_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | } |
| 1551 | return est_mtu ? : new_mtu; |
| 1552 | } |
| 1553 | |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1554 | static void check_peer_pmtu(struct dst_entry *dst, struct inet_peer *peer) |
| 1555 | { |
| 1556 | unsigned long expires = peer->pmtu_expires; |
| 1557 | |
Hiroaki SHIMODA | 46af318 | 2011-03-09 20:09:58 +0000 | [diff] [blame] | 1558 | if (time_before(jiffies, expires)) { |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1559 | u32 orig_dst_mtu = dst_mtu(dst); |
| 1560 | if (peer->pmtu_learned < orig_dst_mtu) { |
| 1561 | if (!peer->pmtu_orig) |
| 1562 | peer->pmtu_orig = dst_metric_raw(dst, RTAX_MTU); |
| 1563 | dst_metric_set(dst, RTAX_MTU, peer->pmtu_learned); |
| 1564 | } |
| 1565 | } else if (cmpxchg(&peer->pmtu_expires, expires, 0) == expires) |
| 1566 | dst_metric_set(dst, RTAX_MTU, peer->pmtu_orig); |
| 1567 | } |
| 1568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 1570 | { |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1571 | struct rtable *rt = (struct rtable *) dst; |
| 1572 | struct inet_peer *peer; |
| 1573 | |
| 1574 | dst_confirm(dst); |
| 1575 | |
| 1576 | if (!rt->peer) |
| 1577 | rt_bind_peer(rt, 1); |
| 1578 | peer = rt->peer; |
| 1579 | if (peer) { |
| 1580 | if (mtu < ip_rt_min_pmtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | mtu = ip_rt_min_pmtu; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1582 | if (!peer->pmtu_expires || mtu < peer->pmtu_learned) { |
Hiroaki SHIMODA | 46af318 | 2011-03-09 20:09:58 +0000 | [diff] [blame] | 1583 | unsigned long pmtu_expires; |
| 1584 | |
| 1585 | pmtu_expires = jiffies + ip_rt_mtu_expires; |
| 1586 | if (!pmtu_expires) |
| 1587 | pmtu_expires = 1UL; |
| 1588 | |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1589 | peer->pmtu_learned = mtu; |
Hiroaki SHIMODA | 46af318 | 2011-03-09 20:09:58 +0000 | [diff] [blame] | 1590 | peer->pmtu_expires = pmtu_expires; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1591 | |
| 1592 | atomic_inc(&__rt_peer_genid); |
| 1593 | rt->rt_peer_genid = rt_peer_genid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | } |
Hiroaki SHIMODA | 46af318 | 2011-03-09 20:09:58 +0000 | [diff] [blame] | 1595 | check_peer_pmtu(dst, peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | } |
| 1597 | } |
| 1598 | |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1599 | static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer) |
| 1600 | { |
| 1601 | struct rtable *rt = (struct rtable *) dst; |
| 1602 | __be32 orig_gw = rt->rt_gateway; |
| 1603 | |
| 1604 | dst_confirm(&rt->dst); |
| 1605 | |
| 1606 | neigh_release(rt->dst.neighbour); |
| 1607 | rt->dst.neighbour = NULL; |
| 1608 | |
| 1609 | rt->rt_gateway = peer->redirect_learned.a4; |
| 1610 | if (arp_bind_neighbour(&rt->dst) || |
| 1611 | !(rt->dst.neighbour->nud_state & NUD_VALID)) { |
| 1612 | if (rt->dst.neighbour) |
| 1613 | neigh_event_send(rt->dst.neighbour, NULL); |
| 1614 | rt->rt_gateway = orig_gw; |
| 1615 | return -EAGAIN; |
| 1616 | } else { |
| 1617 | rt->rt_flags |= RTCF_REDIRECTED; |
| 1618 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, |
| 1619 | rt->dst.neighbour); |
| 1620 | } |
| 1621 | return 0; |
| 1622 | } |
| 1623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
| 1625 | { |
David S. Miller | 6431cbc | 2011-02-07 20:38:06 -0800 | [diff] [blame] | 1626 | struct rtable *rt = (struct rtable *) dst; |
| 1627 | |
| 1628 | if (rt_is_expired(rt)) |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 1629 | return NULL; |
David S. Miller | 6431cbc | 2011-02-07 20:38:06 -0800 | [diff] [blame] | 1630 | if (rt->rt_peer_genid != rt_peer_genid()) { |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1631 | struct inet_peer *peer; |
| 1632 | |
David S. Miller | 6431cbc | 2011-02-07 20:38:06 -0800 | [diff] [blame] | 1633 | if (!rt->peer) |
| 1634 | rt_bind_peer(rt, 0); |
| 1635 | |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1636 | peer = rt->peer; |
| 1637 | if (peer && peer->pmtu_expires) |
| 1638 | check_peer_pmtu(dst, peer); |
| 1639 | |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1640 | if (peer && peer->redirect_learned.a4 && |
| 1641 | peer->redirect_learned.a4 != rt->rt_gateway) { |
| 1642 | if (check_peer_redir(dst, peer)) |
| 1643 | return NULL; |
| 1644 | } |
| 1645 | |
David S. Miller | 6431cbc | 2011-02-07 20:38:06 -0800 | [diff] [blame] | 1646 | rt->rt_peer_genid = rt_peer_genid(); |
| 1647 | } |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 1648 | return dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | } |
| 1650 | |
| 1651 | static void ipv4_dst_destroy(struct dst_entry *dst) |
| 1652 | { |
| 1653 | struct rtable *rt = (struct rtable *) dst; |
| 1654 | struct inet_peer *peer = rt->peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 1656 | if (rt->fi) { |
| 1657 | fib_info_put(rt->fi); |
| 1658 | rt->fi = NULL; |
| 1659 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | if (peer) { |
| 1661 | rt->peer = NULL; |
| 1662 | inet_putpeer(peer); |
| 1663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | } |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
| 1667 | static void ipv4_link_failure(struct sk_buff *skb) |
| 1668 | { |
| 1669 | struct rtable *rt; |
| 1670 | |
| 1671 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| 1672 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1673 | rt = skb_rtable(skb); |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1674 | if (rt && |
| 1675 | rt->peer && |
| 1676 | rt->peer->pmtu_expires) { |
| 1677 | unsigned long orig = rt->peer->pmtu_expires; |
| 1678 | |
| 1679 | if (cmpxchg(&rt->peer->pmtu_expires, orig, 0) == orig) |
| 1680 | dst_metric_set(&rt->dst, RTAX_MTU, rt->peer->pmtu_orig); |
| 1681 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | } |
| 1683 | |
| 1684 | static int ip_rt_bug(struct sk_buff *skb) |
| 1685 | { |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1686 | printk(KERN_DEBUG "ip_rt_bug: %pI4 -> %pI4, %s\n", |
| 1687 | &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | skb->dev ? skb->dev->name : "?"); |
| 1689 | kfree_skb(skb); |
| 1690 | return 0; |
| 1691 | } |
| 1692 | |
| 1693 | /* |
| 1694 | We do not cache source address of outgoing interface, |
| 1695 | because it is used only by IP RR, TS and SRR options, |
| 1696 | so that it out of fast path. |
| 1697 | |
| 1698 | BTW remember: "addr" is allowed to be not aligned |
| 1699 | in IP options! |
| 1700 | */ |
| 1701 | |
| 1702 | void ip_rt_get_source(u8 *addr, struct rtable *rt) |
| 1703 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1704 | __be32 src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | struct fib_result res; |
| 1706 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1707 | if (rt_is_output_route(rt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | src = rt->rt_src; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1709 | else { |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1710 | struct flowi4 fl4 = { |
| 1711 | .daddr = rt->rt_key_dst, |
| 1712 | .saddr = rt->rt_key_src, |
| 1713 | .flowi4_tos = rt->rt_tos, |
| 1714 | .flowi4_oif = rt->rt_oif, |
| 1715 | .flowi4_iif = rt->rt_iif, |
| 1716 | .flowi4_mark = rt->rt_mark, |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1717 | }; |
| 1718 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1719 | rcu_read_lock(); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1720 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame^] | 1721 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1722 | else |
| 1723 | src = inet_select_addr(rt->dst.dev, rt->rt_gateway, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | RT_SCOPE_UNIVERSE); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1725 | rcu_read_unlock(); |
| 1726 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | memcpy(addr, &src, 4); |
| 1728 | } |
| 1729 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1730 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | static void set_class_tag(struct rtable *rt, u32 tag) |
| 1732 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1733 | if (!(rt->dst.tclassid & 0xFFFF)) |
| 1734 | rt->dst.tclassid |= tag & 0xFFFF; |
| 1735 | if (!(rt->dst.tclassid & 0xFFFF0000)) |
| 1736 | rt->dst.tclassid |= tag & 0xFFFF0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | } |
| 1738 | #endif |
| 1739 | |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1740 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
| 1741 | { |
| 1742 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); |
| 1743 | |
| 1744 | if (advmss == 0) { |
| 1745 | advmss = max_t(unsigned int, dst->dev->mtu - 40, |
| 1746 | ip_rt_min_advmss); |
| 1747 | if (advmss > 65535 - 40) |
| 1748 | advmss = 65535 - 40; |
| 1749 | } |
| 1750 | return advmss; |
| 1751 | } |
| 1752 | |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1753 | static unsigned int ipv4_default_mtu(const struct dst_entry *dst) |
| 1754 | { |
| 1755 | unsigned int mtu = dst->dev->mtu; |
| 1756 | |
| 1757 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { |
| 1758 | const struct rtable *rt = (const struct rtable *) dst; |
| 1759 | |
| 1760 | if (rt->rt_gateway != rt->rt_dst && mtu > 576) |
| 1761 | mtu = 576; |
| 1762 | } |
| 1763 | |
| 1764 | if (mtu > IP_MAX_MTU) |
| 1765 | mtu = IP_MAX_MTU; |
| 1766 | |
| 1767 | return mtu; |
| 1768 | } |
| 1769 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1770 | static void rt_init_metrics(struct rtable *rt, const struct flowi4 *oldflp4, |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1771 | struct fib_info *fi) |
David S. Miller | a4daad6 | 2011-01-27 22:01:53 -0800 | [diff] [blame] | 1772 | { |
David S. Miller | 0131ba4 | 2011-02-04 14:37:30 -0800 | [diff] [blame] | 1773 | struct inet_peer *peer; |
| 1774 | int create = 0; |
| 1775 | |
| 1776 | /* If a peer entry exists for this destination, we must hook |
| 1777 | * it up in order to get at cached metrics. |
| 1778 | */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1779 | if (oldflp4 && (oldflp4->flowi4_flags & FLOWI_FLAG_PRECOW_METRICS)) |
David S. Miller | 0131ba4 | 2011-02-04 14:37:30 -0800 | [diff] [blame] | 1780 | create = 1; |
| 1781 | |
David S. Miller | 3c0afdc | 2011-03-04 21:26:07 -0800 | [diff] [blame] | 1782 | rt->peer = peer = inet_getpeer_v4(rt->rt_dst, create); |
David S. Miller | 0131ba4 | 2011-02-04 14:37:30 -0800 | [diff] [blame] | 1783 | if (peer) { |
David S. Miller | 3c0afdc | 2011-03-04 21:26:07 -0800 | [diff] [blame] | 1784 | rt->rt_peer_genid = rt_peer_genid(); |
David S. Miller | 0131ba4 | 2011-02-04 14:37:30 -0800 | [diff] [blame] | 1785 | if (inet_metrics_new(peer)) |
| 1786 | memcpy(peer->metrics, fi->fib_metrics, |
| 1787 | sizeof(u32) * RTAX_MAX); |
| 1788 | dst_init_metrics(&rt->dst, peer->metrics, false); |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1789 | |
| 1790 | if (peer->pmtu_expires) |
| 1791 | check_peer_pmtu(&rt->dst, peer); |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1792 | if (peer->redirect_learned.a4 && |
| 1793 | peer->redirect_learned.a4 != rt->rt_gateway) { |
| 1794 | rt->rt_gateway = peer->redirect_learned.a4; |
| 1795 | rt->rt_flags |= RTCF_REDIRECTED; |
| 1796 | } |
David S. Miller | 0131ba4 | 2011-02-04 14:37:30 -0800 | [diff] [blame] | 1797 | } else { |
David S. Miller | b8dad61 | 2011-01-28 14:07:16 -0800 | [diff] [blame] | 1798 | if (fi->fib_metrics != (u32 *) dst_default_metrics) { |
| 1799 | rt->fi = fi; |
| 1800 | atomic_inc(&fi->fib_clntref); |
| 1801 | } |
David S. Miller | a4daad6 | 2011-01-27 22:01:53 -0800 | [diff] [blame] | 1802 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
David S. Miller | a4daad6 | 2011-01-27 22:01:53 -0800 | [diff] [blame] | 1803 | } |
| 1804 | } |
| 1805 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1806 | static void rt_set_nexthop(struct rtable *rt, const struct flowi4 *oldflp4, |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1807 | const struct fib_result *res, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1808 | struct fib_info *fi, u16 type, u32 itag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | { |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1810 | struct dst_entry *dst = &rt->dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | |
| 1812 | if (fi) { |
| 1813 | if (FIB_RES_GW(*res) && |
| 1814 | FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
| 1815 | rt->rt_gateway = FIB_RES_GW(*res); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1816 | rt_init_metrics(rt, oldflp4, fi); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1817 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1818 | dst->tclassid = FIB_RES_NH(*res).nh_tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | #endif |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1820 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1822 | if (dst_mtu(dst) > IP_MAX_MTU) |
| 1823 | dst_metric_set(dst, RTAX_MTU, IP_MAX_MTU); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1824 | if (dst_metric_raw(dst, RTAX_ADVMSS) > 65535 - 40) |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 1825 | dst_metric_set(dst, RTAX_ADVMSS, 65535 - 40); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1827 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 1829 | set_class_tag(rt, fib_rules_tclass(res)); |
| 1830 | #endif |
| 1831 | set_class_tag(rt, itag); |
| 1832 | #endif |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1833 | rt->rt_type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | } |
| 1835 | |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1836 | static struct rtable *rt_dst_alloc(bool nopolicy, bool noxfrm) |
| 1837 | { |
David S. Miller | 3c7bd1a | 2011-02-16 14:08:44 -0800 | [diff] [blame] | 1838 | struct rtable *rt = dst_alloc(&ipv4_dst_ops, 1); |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1839 | if (rt) { |
| 1840 | rt->dst.obsolete = -1; |
| 1841 | |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1842 | rt->dst.flags = DST_HOST | |
| 1843 | (nopolicy ? DST_NOPOLICY : 0) | |
| 1844 | (noxfrm ? DST_NOXFRM : 0); |
| 1845 | } |
| 1846 | return rt; |
| 1847 | } |
| 1848 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1849 | /* called in rcu_read_lock() section */ |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1850 | 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] | 1851 | u8 tos, struct net_device *dev, int our) |
| 1852 | { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1853 | unsigned int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | struct rtable *rth; |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1855 | __be32 spec_dst; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1856 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | u32 itag = 0; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1858 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | |
| 1860 | /* Primary sanity checks. */ |
| 1861 | |
| 1862 | if (in_dev == NULL) |
| 1863 | return -EINVAL; |
| 1864 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1865 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1866 | ipv4_is_loopback(saddr) || skb->protocol != htons(ETH_P_IP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | goto e_inval; |
| 1868 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1869 | if (ipv4_is_zeronet(saddr)) { |
| 1870 | if (!ipv4_is_local_multicast(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | goto e_inval; |
| 1872 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1873 | } else { |
| 1874 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, |
| 1875 | &itag, 0); |
| 1876 | if (err < 0) |
| 1877 | goto e_err; |
| 1878 | } |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1879 | rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | if (!rth) |
| 1881 | goto e_nobufs; |
| 1882 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1883 | rth->dst.output = ip_rt_bug; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1885 | rth->rt_key_dst = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | rth->rt_dst = daddr; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1887 | rth->rt_tos = tos; |
| 1888 | rth->rt_mark = skb->mark; |
| 1889 | rth->rt_key_src = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | rth->rt_src = saddr; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1891 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1892 | rth->dst.tclassid = itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | #endif |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1894 | rth->rt_iif = dev->ifindex; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1895 | rth->dst.dev = init_net.loopback_dev; |
| 1896 | dev_hold(rth->dst.dev); |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1897 | rth->rt_oif = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | rth->rt_gateway = daddr; |
| 1899 | rth->rt_spec_dst= spec_dst; |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1900 | rth->rt_genid = rt_genid(dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | rth->rt_flags = RTCF_MULTICAST; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1902 | rth->rt_type = RTN_MULTICAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | if (our) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1904 | rth->dst.input= ip_local_deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | rth->rt_flags |= RTCF_LOCAL; |
| 1906 | } |
| 1907 | |
| 1908 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1909 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1910 | rth->dst.input = ip_mr_input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | #endif |
| 1912 | RT_CACHE_STAT_INC(in_slow_mc); |
| 1913 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1914 | hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev))); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1915 | rth = rt_intern_hash(hash, rth, skb, dev->ifindex); |
| 1916 | err = 0; |
| 1917 | if (IS_ERR(rth)) |
| 1918 | err = PTR_ERR(rth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
| 1920 | e_nobufs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | e_inval: |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1923 | return -EINVAL; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1924 | e_err: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1925 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | } |
| 1927 | |
| 1928 | |
| 1929 | static void ip_handle_martian_source(struct net_device *dev, |
| 1930 | struct in_device *in_dev, |
| 1931 | struct sk_buff *skb, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1932 | __be32 daddr, |
| 1933 | __be32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | { |
| 1935 | RT_CACHE_STAT_INC(in_martian_src); |
| 1936 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1937 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { |
| 1938 | /* |
| 1939 | * RFC1812 recommendation, if source is martian, |
| 1940 | * the only hint is MAC header. |
| 1941 | */ |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1942 | printk(KERN_WARNING "martian source %pI4 from %pI4, on dev %s\n", |
| 1943 | &daddr, &saddr, dev->name); |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1944 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | int i; |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1946 | const unsigned char *p = skb_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | printk(KERN_WARNING "ll header: "); |
| 1948 | for (i = 0; i < dev->hard_header_len; i++, p++) { |
| 1949 | printk("%02x", *p); |
| 1950 | if (i < (dev->hard_header_len - 1)) |
| 1951 | printk(":"); |
| 1952 | } |
| 1953 | printk("\n"); |
| 1954 | } |
| 1955 | } |
| 1956 | #endif |
| 1957 | } |
| 1958 | |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1959 | /* called in rcu_read_lock() section */ |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1960 | static int __mkroute_input(struct sk_buff *skb, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1961 | const struct fib_result *res, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1962 | struct in_device *in_dev, |
| 1963 | __be32 daddr, __be32 saddr, u32 tos, |
| 1964 | struct rtable **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | struct rtable *rth; |
| 1967 | int err; |
| 1968 | struct in_device *out_dev; |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1969 | unsigned int flags = 0; |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 1970 | __be32 spec_dst; |
| 1971 | u32 itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | |
| 1973 | /* get a working reference to the output device */ |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1974 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | if (out_dev == NULL) { |
| 1976 | if (net_ratelimit()) |
| 1977 | printk(KERN_CRIT "Bug in ip_route_input" \ |
| 1978 | "_slow(). Please, report\n"); |
| 1979 | return -EINVAL; |
| 1980 | } |
| 1981 | |
| 1982 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1983 | err = fib_validate_source(saddr, daddr, tos, FIB_RES_OIF(*res), |
jamal | b0c110c | 2009-10-18 02:12:33 +0000 | [diff] [blame] | 1984 | in_dev->dev, &spec_dst, &itag, skb->mark); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | if (err < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1986 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | saddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | goto cleanup; |
| 1990 | } |
| 1991 | |
| 1992 | if (err) |
| 1993 | flags |= RTCF_DIRECTSRC; |
| 1994 | |
Thomas Graf | 51b77ca | 2008-06-03 16:36:01 -0700 | [diff] [blame] | 1995 | if (out_dev == in_dev && err && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | (IN_DEV_SHARED_MEDIA(out_dev) || |
| 1997 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
| 1998 | flags |= RTCF_DOREDIRECT; |
| 1999 | |
| 2000 | if (skb->protocol != htons(ETH_P_IP)) { |
| 2001 | /* Not IP (i.e. ARP). Do not create route, if it is |
| 2002 | * invalid for proxy arp. DNAT routes are always valid. |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 2003 | * |
| 2004 | * Proxy arp feature have been extended to allow, ARP |
| 2005 | * replies back to the same interface, to support |
| 2006 | * Private VLAN switch technologies. See arp.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | */ |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 2008 | if (out_dev == in_dev && |
| 2009 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | err = -EINVAL; |
| 2011 | goto cleanup; |
| 2012 | } |
| 2013 | } |
| 2014 | |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 2015 | rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), |
| 2016 | IN_DEV_CONF_GET(out_dev, NOXFRM)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | if (!rth) { |
| 2018 | err = -ENOBUFS; |
| 2019 | goto cleanup; |
| 2020 | } |
| 2021 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2022 | rth->rt_key_dst = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | rth->rt_dst = daddr; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2024 | rth->rt_tos = tos; |
| 2025 | rth->rt_mark = skb->mark; |
| 2026 | rth->rt_key_src = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | rth->rt_src = saddr; |
| 2028 | rth->rt_gateway = daddr; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2029 | rth->rt_iif = in_dev->dev->ifindex; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2030 | rth->dst.dev = (out_dev)->dev; |
| 2031 | dev_hold(rth->dst.dev); |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2032 | rth->rt_oif = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | rth->rt_spec_dst= spec_dst; |
| 2034 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2035 | rth->dst.input = ip_forward; |
| 2036 | rth->dst.output = ip_output; |
| 2037 | rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2039 | rt_set_nexthop(rth, NULL, res, res->fi, res->type, itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | |
| 2041 | rth->rt_flags = flags; |
| 2042 | |
| 2043 | *result = rth; |
| 2044 | err = 0; |
| 2045 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | return err; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2047 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 2049 | static int ip_mkroute_input(struct sk_buff *skb, |
| 2050 | struct fib_result *res, |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2051 | const struct flowi4 *fl4, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 2052 | struct in_device *in_dev, |
| 2053 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | { |
Chuck Short | 7abaa27 | 2005-06-22 22:10:23 -0700 | [diff] [blame] | 2055 | struct rtable* rth = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | int err; |
| 2057 | unsigned hash; |
| 2058 | |
| 2059 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | ff3fccb | 2011-03-10 16:23:24 -0800 | [diff] [blame] | 2060 | if (res->fi && res->fi->fib_nhs > 1) |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 2061 | fib_select_multipath(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | #endif |
| 2063 | |
| 2064 | /* create a routing cache entry */ |
| 2065 | err = __mkroute_input(skb, res, in_dev, daddr, saddr, tos, &rth); |
| 2066 | if (err) |
| 2067 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | |
| 2069 | /* put it into the cache */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2070 | hash = rt_hash(daddr, saddr, fl4->flowi4_iif, |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2071 | rt_genid(dev_net(rth->dst.dev))); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2072 | rth = rt_intern_hash(hash, rth, skb, fl4->flowi4_iif); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2073 | if (IS_ERR(rth)) |
| 2074 | return PTR_ERR(rth); |
| 2075 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | } |
| 2077 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | /* |
| 2079 | * NOTE. We drop all the packets that has local source |
| 2080 | * addresses, because every properly looped back packet |
| 2081 | * must have correct destination already attached by output routine. |
| 2082 | * |
| 2083 | * Such approach solves two big problems: |
| 2084 | * 1. Not simplex devices are handled properly. |
| 2085 | * 2. IP spoofing attempts are filtered with 100% of guarantee. |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2086 | * called with rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | */ |
| 2088 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2089 | 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] | 2090 | u8 tos, struct net_device *dev) |
| 2091 | { |
| 2092 | struct fib_result res; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2093 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2094 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | unsigned flags = 0; |
| 2096 | u32 itag = 0; |
| 2097 | struct rtable * rth; |
| 2098 | unsigned hash; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2099 | __be32 spec_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | int err = -EINVAL; |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2101 | struct net * net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | |
| 2103 | /* IP on this device is disabled. */ |
| 2104 | |
| 2105 | if (!in_dev) |
| 2106 | goto out; |
| 2107 | |
| 2108 | /* Check for the most weird martians, which can be not detected |
| 2109 | by fib_lookup. |
| 2110 | */ |
| 2111 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 2112 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2113 | ipv4_is_loopback(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | goto martian_source; |
| 2115 | |
Andy Walls | 27a954b | 2010-10-17 15:11:22 +0000 | [diff] [blame] | 2116 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | goto brd_input; |
| 2118 | |
| 2119 | /* Accept zero addresses only to limited broadcast; |
| 2120 | * I even do not know to fix it or not. Waiting for complains :-) |
| 2121 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2122 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | goto martian_source; |
| 2124 | |
Andy Walls | 27a954b | 2010-10-17 15:11:22 +0000 | [diff] [blame] | 2125 | if (ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | goto martian_destination; |
| 2127 | |
| 2128 | /* |
| 2129 | * Now we are ready to route packet. |
| 2130 | */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2131 | fl4.flowi4_oif = 0; |
| 2132 | fl4.flowi4_iif = dev->ifindex; |
| 2133 | fl4.flowi4_mark = skb->mark; |
| 2134 | fl4.flowi4_tos = tos; |
| 2135 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
| 2136 | fl4.daddr = daddr; |
| 2137 | fl4.saddr = saddr; |
| 2138 | err = fib_lookup(net, &fl4, &res); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2139 | if (err != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | if (!IN_DEV_FORWARD(in_dev)) |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2141 | goto e_hostunreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2142 | goto no_route; |
| 2143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | |
| 2145 | RT_CACHE_STAT_INC(in_slow_tot); |
| 2146 | |
| 2147 | if (res.type == RTN_BROADCAST) |
| 2148 | goto brd_input; |
| 2149 | |
| 2150 | if (res.type == RTN_LOCAL) { |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 2151 | err = fib_validate_source(saddr, daddr, tos, |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2152 | net->loopback_dev->ifindex, |
| 2153 | dev, &spec_dst, &itag, skb->mark); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 2154 | if (err < 0) |
| 2155 | goto martian_source_keep_err; |
| 2156 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | flags |= RTCF_DIRECTSRC; |
| 2158 | spec_dst = daddr; |
| 2159 | goto local_input; |
| 2160 | } |
| 2161 | |
| 2162 | if (!IN_DEV_FORWARD(in_dev)) |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2163 | goto e_hostunreach; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | if (res.type != RTN_UNICAST) |
| 2165 | goto martian_destination; |
| 2166 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2167 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | out: return err; |
| 2169 | |
| 2170 | brd_input: |
| 2171 | if (skb->protocol != htons(ETH_P_IP)) |
| 2172 | goto e_inval; |
| 2173 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2174 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_LINK); |
| 2176 | else { |
| 2177 | err = fib_validate_source(saddr, 0, tos, 0, dev, &spec_dst, |
jamal | b0c110c | 2009-10-18 02:12:33 +0000 | [diff] [blame] | 2178 | &itag, skb->mark); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | if (err < 0) |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 2180 | goto martian_source_keep_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | if (err) |
| 2182 | flags |= RTCF_DIRECTSRC; |
| 2183 | } |
| 2184 | flags |= RTCF_BROADCAST; |
| 2185 | res.type = RTN_BROADCAST; |
| 2186 | RT_CACHE_STAT_INC(in_brd); |
| 2187 | |
| 2188 | local_input: |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 2189 | rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | if (!rth) |
| 2191 | goto e_nobufs; |
| 2192 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2193 | rth->dst.output= ip_rt_bug; |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2194 | rth->rt_genid = rt_genid(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2196 | rth->rt_key_dst = daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | rth->rt_dst = daddr; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2198 | rth->rt_tos = tos; |
| 2199 | rth->rt_mark = skb->mark; |
| 2200 | rth->rt_key_src = saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | rth->rt_src = saddr; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2202 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2203 | rth->dst.tclassid = itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | #endif |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2205 | rth->rt_iif = dev->ifindex; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2206 | rth->dst.dev = net->loopback_dev; |
| 2207 | dev_hold(rth->dst.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | rth->rt_gateway = daddr; |
| 2209 | rth->rt_spec_dst= spec_dst; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2210 | rth->dst.input= ip_local_deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | rth->rt_flags = flags|RTCF_LOCAL; |
| 2212 | if (res.type == RTN_UNREACHABLE) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2213 | rth->dst.input= ip_error; |
| 2214 | rth->dst.error= -err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | rth->rt_flags &= ~RTCF_LOCAL; |
| 2216 | } |
| 2217 | rth->rt_type = res.type; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2218 | hash = rt_hash(daddr, saddr, fl4.flowi4_iif, rt_genid(net)); |
| 2219 | rth = rt_intern_hash(hash, rth, skb, fl4.flowi4_iif); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2220 | err = 0; |
| 2221 | if (IS_ERR(rth)) |
| 2222 | err = PTR_ERR(rth); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2223 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | |
| 2225 | no_route: |
| 2226 | RT_CACHE_STAT_INC(in_no_route); |
| 2227 | spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 2228 | res.type = RTN_UNREACHABLE; |
Mitsuru Chinen | 7f53878 | 2007-12-07 01:07:24 -0800 | [diff] [blame] | 2229 | if (err == -ESRCH) |
| 2230 | err = -ENETUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | goto local_input; |
| 2232 | |
| 2233 | /* |
| 2234 | * Do not cache martian addresses: they should be logged (RFC1812) |
| 2235 | */ |
| 2236 | martian_destination: |
| 2237 | RT_CACHE_STAT_INC(in_martian_dst); |
| 2238 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 2239 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 2240 | printk(KERN_WARNING "martian destination %pI4 from %pI4, dev %s\n", |
| 2241 | &daddr, &saddr, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | #endif |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2243 | |
| 2244 | e_hostunreach: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2245 | err = -EHOSTUNREACH; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2246 | goto out; |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | e_inval: |
| 2249 | err = -EINVAL; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2250 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | |
| 2252 | e_nobufs: |
| 2253 | err = -ENOBUFS; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2254 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | |
| 2256 | martian_source: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 2257 | err = -EINVAL; |
| 2258 | martian_source_keep_err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2260 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | } |
| 2262 | |
Eric Dumazet | 407eadd | 2010-05-10 11:32:55 +0000 | [diff] [blame] | 2263 | int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
| 2264 | u8 tos, struct net_device *dev, bool noref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | { |
| 2266 | struct rtable * rth; |
| 2267 | unsigned hash; |
| 2268 | int iif = dev->ifindex; |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 2269 | struct net *net; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2270 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2272 | net = dev_net(dev); |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 2273 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2274 | rcu_read_lock(); |
| 2275 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 2276 | if (!rt_caching(net)) |
| 2277 | goto skip_cache; |
| 2278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | tos &= IPTOS_RT_MASK; |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2280 | hash = rt_hash(daddr, saddr, iif, rt_genid(net)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | for (rth = rcu_dereference(rt_hash_table[hash].chain); rth; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2283 | rth = rcu_dereference(rth->dst.rt_next)) { |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2284 | if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) | |
| 2285 | ((__force u32)rth->rt_key_src ^ (__force u32)saddr) | |
| 2286 | (rth->rt_iif ^ iif) | |
| 2287 | rth->rt_oif | |
| 2288 | (rth->rt_tos ^ tos)) == 0 && |
| 2289 | rth->rt_mark == skb->mark && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2290 | net_eq(dev_net(rth->dst.dev), net) && |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2291 | !rt_is_expired(rth)) { |
Eric Dumazet | 407eadd | 2010-05-10 11:32:55 +0000 | [diff] [blame] | 2292 | if (noref) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2293 | dst_use_noref(&rth->dst, jiffies); |
| 2294 | skb_dst_set_noref(skb, &rth->dst); |
Eric Dumazet | 407eadd | 2010-05-10 11:32:55 +0000 | [diff] [blame] | 2295 | } else { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2296 | dst_use(&rth->dst, jiffies); |
| 2297 | skb_dst_set(skb, &rth->dst); |
Eric Dumazet | 407eadd | 2010-05-10 11:32:55 +0000 | [diff] [blame] | 2298 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | RT_CACHE_STAT_INC(in_hit); |
| 2300 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | return 0; |
| 2302 | } |
| 2303 | RT_CACHE_STAT_INC(in_hlist_search); |
| 2304 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 2306 | skip_cache: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | /* Multicast recognition logic is moved from route cache to here. |
| 2308 | The problem was that too many Ethernet cards have broken/missing |
| 2309 | hardware multicast filters :-( As result the host on multicasting |
| 2310 | network acquires a lot of useless route cache entries, sort of |
| 2311 | SDR messages from all the world. Now we try to get rid of them. |
| 2312 | Really, provided software IP multicast filter is organized |
| 2313 | reasonably (at least, hashed), it does not result in a slowdown |
| 2314 | comparing with route cache reject entries. |
| 2315 | Note, that multicast routers are not affected, because |
| 2316 | route cache entry is created eventually. |
| 2317 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2318 | if (ipv4_is_multicast(daddr)) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2319 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2321 | if (in_dev) { |
David S. Miller | dbdd9a5 | 2011-03-10 16:34:38 -0800 | [diff] [blame] | 2322 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
| 2323 | ip_hdr(skb)->protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | if (our |
| 2325 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 2326 | || |
| 2327 | (!ipv4_is_local_multicast(daddr) && |
| 2328 | IN_DEV_MFORWARD(in_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | #endif |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 2330 | ) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2331 | int res = ip_route_input_mc(skb, daddr, saddr, |
| 2332 | tos, dev, our); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | rcu_read_unlock(); |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2334 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | } |
| 2336 | } |
| 2337 | rcu_read_unlock(); |
| 2338 | return -EINVAL; |
| 2339 | } |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2340 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
| 2341 | rcu_read_unlock(); |
| 2342 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | } |
Eric Dumazet | 407eadd | 2010-05-10 11:32:55 +0000 | [diff] [blame] | 2344 | EXPORT_SYMBOL(ip_route_input_common); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2345 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2346 | /* called with rcu_read_lock() */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2347 | static struct rtable *__mkroute_output(const struct fib_result *res, |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2348 | const struct flowi4 *fl4, |
| 2349 | const struct flowi4 *oldflp4, |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2350 | struct net_device *dev_out, |
| 2351 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | { |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2353 | struct fib_info *fi = res->fi; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2354 | u32 tos = RT_FL_TOS(oldflp4); |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2355 | struct in_device *in_dev; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2356 | u16 type = res->type; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2357 | struct rtable *rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2359 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2360 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2362 | if (ipv4_is_lbcast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2363 | type = RTN_BROADCAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2364 | else if (ipv4_is_multicast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2365 | type = RTN_MULTICAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2366 | else if (ipv4_is_zeronet(fl4->daddr)) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2367 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | |
| 2369 | if (dev_out->flags & IFF_LOOPBACK) |
| 2370 | flags |= RTCF_LOCAL; |
| 2371 | |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 2372 | in_dev = __in_dev_get_rcu(dev_out); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2373 | if (!in_dev) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2374 | return ERR_PTR(-EINVAL); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2375 | |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2376 | if (type == RTN_BROADCAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2378 | fi = NULL; |
| 2379 | } else if (type == RTN_MULTICAST) { |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 2380 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2381 | if (!ip_check_mc_rcu(in_dev, oldflp4->daddr, oldflp4->saddr, |
| 2382 | oldflp4->flowi4_proto)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | flags &= ~RTCF_LOCAL; |
| 2384 | /* If multicast route do not exist use |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 2385 | * default one, but do not gateway in this case. |
| 2386 | * Yes, it is hack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2388 | if (fi && res->prefixlen < 4) |
| 2389 | fi = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | } |
| 2391 | |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 2392 | rth = rt_dst_alloc(IN_DEV_CONF_GET(in_dev, NOPOLICY), |
| 2393 | IN_DEV_CONF_GET(in_dev, NOXFRM)); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 2394 | if (!rth) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2395 | return ERR_PTR(-ENOBUFS); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 2396 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2397 | rth->rt_key_dst = oldflp4->daddr; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2398 | rth->rt_tos = tos; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2399 | rth->rt_key_src = oldflp4->saddr; |
| 2400 | rth->rt_oif = oldflp4->flowi4_oif; |
| 2401 | rth->rt_mark = oldflp4->flowi4_mark; |
| 2402 | rth->rt_dst = fl4->daddr; |
| 2403 | rth->rt_src = fl4->saddr; |
David S. Miller | 1018b5c | 2011-03-04 21:35:25 -0800 | [diff] [blame] | 2404 | rth->rt_iif = 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2405 | /* 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] | 2406 | cache entry */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2407 | rth->dst.dev = dev_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | dev_hold(dev_out); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2409 | rth->rt_gateway = fl4->daddr; |
| 2410 | rth->rt_spec_dst= fl4->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2412 | rth->dst.output=ip_output; |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2413 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | |
| 2415 | RT_CACHE_STAT_INC(out_slow_tot); |
| 2416 | |
| 2417 | if (flags & RTCF_LOCAL) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2418 | rth->dst.input = ip_local_deliver; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2419 | rth->rt_spec_dst = fl4->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | } |
| 2421 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2422 | rth->rt_spec_dst = fl4->saddr; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2423 | if (flags & RTCF_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | !(dev_out->flags & IFF_LOOPBACK)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2425 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | RT_CACHE_STAT_INC(out_slow_mc); |
| 2427 | } |
| 2428 | #ifdef CONFIG_IP_MROUTE |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2429 | if (type == RTN_MULTICAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | if (IN_DEV_MFORWARD(in_dev) && |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2431 | !ipv4_is_local_multicast(oldflp4->daddr)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2432 | rth->dst.input = ip_mr_input; |
| 2433 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | } |
| 2435 | } |
| 2436 | #endif |
| 2437 | } |
| 2438 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2439 | rt_set_nexthop(rth, oldflp4, res, fi, type, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | |
| 2441 | rth->rt_flags = flags; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2442 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | } |
| 2444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | /* |
| 2446 | * Major route resolver routine. |
Eric Dumazet | 0197aa3 | 2010-09-30 03:33:58 +0000 | [diff] [blame] | 2447 | * called with rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2448 | */ |
| 2449 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2450 | static struct rtable *ip_route_output_slow(struct net *net, |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2451 | const struct flowi4 *oldflp4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | { |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2453 | u32 tos = RT_FL_TOS(oldflp4); |
| 2454 | struct flowi4 fl4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | struct fib_result res; |
Eric Dumazet | 0197aa3 | 2010-09-30 03:33:58 +0000 | [diff] [blame] | 2456 | unsigned int flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | struct net_device *dev_out = NULL; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2458 | struct rtable *rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | |
| 2460 | res.fi = NULL; |
| 2461 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 2462 | res.r = NULL; |
| 2463 | #endif |
| 2464 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2465 | fl4.flowi4_oif = oldflp4->flowi4_oif; |
| 2466 | fl4.flowi4_iif = net->loopback_dev->ifindex; |
| 2467 | fl4.flowi4_mark = oldflp4->flowi4_mark; |
| 2468 | fl4.daddr = oldflp4->daddr; |
| 2469 | fl4.saddr = oldflp4->saddr; |
| 2470 | fl4.flowi4_tos = tos & IPTOS_RT_MASK; |
| 2471 | fl4.flowi4_scope = ((tos & RTO_ONLINK) ? |
David S. Miller | 44713b6 | 2011-03-04 21:24:47 -0800 | [diff] [blame] | 2472 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); |
| 2473 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2474 | rcu_read_lock(); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2475 | if (oldflp4->saddr) { |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2476 | rth = ERR_PTR(-EINVAL); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2477 | if (ipv4_is_multicast(oldflp4->saddr) || |
| 2478 | ipv4_is_lbcast(oldflp4->saddr) || |
| 2479 | ipv4_is_zeronet(oldflp4->saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2480 | goto out; |
| 2481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | /* I removed check for oif == dev_out->oif here. |
| 2483 | It was wrong for two reasons: |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 2484 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
| 2485 | is assigned to multiple interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | 2. Moreover, we are allowed to send packets with saddr |
| 2487 | of another iface. --ANK |
| 2488 | */ |
| 2489 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2490 | if (oldflp4->flowi4_oif == 0 && |
| 2491 | (ipv4_is_multicast(oldflp4->daddr) || |
| 2492 | ipv4_is_lbcast(oldflp4->daddr))) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2493 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2494 | dev_out = __ip_dev_find(net, oldflp4->saddr, false); |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2495 | if (dev_out == NULL) |
| 2496 | goto out; |
| 2497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2498 | /* Special hack: user can direct multicasts |
| 2499 | and limited broadcast via necessary interface |
| 2500 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. |
| 2501 | This hack is not just for fun, it allows |
| 2502 | vic,vat and friends to work. |
| 2503 | They bind socket to loopback, set ttl to zero |
| 2504 | and expect that it will work. |
| 2505 | From the viewpoint of routing cache they are broken, |
| 2506 | because we are not allowed to build multicast path |
| 2507 | with loopback source addr (look, routing cache |
| 2508 | cannot know, that ttl is zero, so that packet |
| 2509 | will not leave this host and route is valid). |
| 2510 | Luckily, this hack is good workaround. |
| 2511 | */ |
| 2512 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2513 | fl4.flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2514 | goto make_route; |
| 2515 | } |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2516 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2517 | if (!(oldflp4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2518 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2519 | if (!__ip_dev_find(net, oldflp4->saddr, false)) |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2520 | goto out; |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2522 | } |
| 2523 | |
| 2524 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2525 | if (oldflp4->flowi4_oif) { |
| 2526 | dev_out = dev_get_by_index_rcu(net, oldflp4->flowi4_oif); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2527 | rth = ERR_PTR(-ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | if (dev_out == NULL) |
| 2529 | goto out; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2530 | |
| 2531 | /* RACE: Check return value of inet_select_addr instead. */ |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 2532 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2533 | rth = ERR_PTR(-ENETUNREACH); |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 2534 | goto out; |
| 2535 | } |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2536 | if (ipv4_is_local_multicast(oldflp4->daddr) || |
| 2537 | ipv4_is_lbcast(oldflp4->daddr)) { |
| 2538 | if (!fl4.saddr) |
| 2539 | fl4.saddr = inet_select_addr(dev_out, 0, |
| 2540 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2541 | goto make_route; |
| 2542 | } |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2543 | if (!fl4.saddr) { |
| 2544 | if (ipv4_is_multicast(oldflp4->daddr)) |
| 2545 | fl4.saddr = inet_select_addr(dev_out, 0, |
| 2546 | fl4.flowi4_scope); |
| 2547 | else if (!oldflp4->daddr) |
| 2548 | fl4.saddr = inet_select_addr(dev_out, 0, |
| 2549 | RT_SCOPE_HOST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2550 | } |
| 2551 | } |
| 2552 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2553 | if (!fl4.daddr) { |
| 2554 | fl4.daddr = fl4.saddr; |
| 2555 | if (!fl4.daddr) |
| 2556 | fl4.daddr = fl4.saddr = htonl(INADDR_LOOPBACK); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2557 | dev_out = net->loopback_dev; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2558 | fl4.flowi4_oif = net->loopback_dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | res.type = RTN_LOCAL; |
| 2560 | flags |= RTCF_LOCAL; |
| 2561 | goto make_route; |
| 2562 | } |
| 2563 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2564 | if (fib_lookup(net, &fl4, &res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | res.fi = NULL; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2566 | if (oldflp4->flowi4_oif) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2567 | /* Apparently, routing tables are wrong. Assume, |
| 2568 | that the destination is on link. |
| 2569 | |
| 2570 | WHY? DW. |
| 2571 | Because we are allowed to send to iface |
| 2572 | even if it has NO routes and NO assigned |
| 2573 | addresses. When oif is specified, routing |
| 2574 | tables are looked up with only one purpose: |
| 2575 | to catch if destination is gatewayed, rather than |
| 2576 | direct. Moreover, if MSG_DONTROUTE is set, |
| 2577 | we send packet, ignoring both routing tables |
| 2578 | and ifaddr state. --ANK |
| 2579 | |
| 2580 | |
| 2581 | We could make it even if oif is unknown, |
| 2582 | likely IPv6, but we do not. |
| 2583 | */ |
| 2584 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2585 | if (fl4.saddr == 0) |
| 2586 | fl4.saddr = inet_select_addr(dev_out, 0, |
| 2587 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | res.type = RTN_UNICAST; |
| 2589 | goto make_route; |
| 2590 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2591 | rth = ERR_PTR(-ENETUNREACH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | goto out; |
| 2593 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2594 | |
| 2595 | if (res.type == RTN_LOCAL) { |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2596 | if (!fl4.saddr) { |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2597 | if (res.fi->fib_prefsrc) |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2598 | fl4.saddr = res.fi->fib_prefsrc; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2599 | else |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2600 | fl4.saddr = fl4.daddr; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2601 | } |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2602 | dev_out = net->loopback_dev; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2603 | fl4.flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | res.fi = NULL; |
| 2605 | flags |= RTCF_LOCAL; |
| 2606 | goto make_route; |
| 2607 | } |
| 2608 | |
| 2609 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2610 | if (res.fi->fib_nhs > 1 && fl4.flowi4_oif == 0) |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 2611 | fib_select_multipath(&res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2612 | else |
| 2613 | #endif |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2614 | if (!res.prefixlen && res.type == RTN_UNICAST && !fl4.flowi4_oif) |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 2615 | fib_select_default(&res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2616 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2617 | if (!fl4.saddr) |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame^] | 2618 | fl4.saddr = FIB_RES_PREFSRC(net, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | dev_out = FIB_RES_DEV(res); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2621 | fl4.flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2622 | |
| 2623 | |
| 2624 | make_route: |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2625 | rth = __mkroute_output(&res, &fl4, oldflp4, dev_out, flags); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2626 | if (!IS_ERR(rth)) { |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2627 | unsigned int hash; |
| 2628 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2629 | hash = rt_hash(oldflp4->daddr, oldflp4->saddr, oldflp4->flowi4_oif, |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2630 | rt_genid(dev_net(dev_out))); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2631 | rth = rt_intern_hash(hash, rth, NULL, oldflp4->flowi4_oif); |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2632 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2634 | out: |
| 2635 | rcu_read_unlock(); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2636 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2637 | } |
| 2638 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2639 | struct rtable *__ip_route_output_key(struct net *net, const struct flowi4 *flp4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2641 | struct rtable *rth; |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2642 | unsigned int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 2644 | if (!rt_caching(net)) |
| 2645 | goto slow_output; |
| 2646 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2647 | hash = rt_hash(flp4->daddr, flp4->saddr, flp4->flowi4_oif, rt_genid(net)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2648 | |
| 2649 | rcu_read_lock_bh(); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 2650 | for (rth = rcu_dereference_bh(rt_hash_table[hash].chain); rth; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2651 | rth = rcu_dereference_bh(rth->dst.rt_next)) { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2652 | if (rth->rt_key_dst == flp4->daddr && |
| 2653 | rth->rt_key_src == flp4->saddr && |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 2654 | rt_is_output_route(rth) && |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2655 | rth->rt_oif == flp4->flowi4_oif && |
| 2656 | rth->rt_mark == flp4->flowi4_mark && |
| 2657 | !((rth->rt_tos ^ flp4->flowi4_tos) & |
Denis V. Lunev | b592191 | 2008-01-22 23:50:25 -0800 | [diff] [blame] | 2658 | (IPTOS_RT_MASK | RTO_ONLINK)) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2659 | net_eq(dev_net(rth->dst.dev), net) && |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2660 | !rt_is_expired(rth)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2661 | dst_use(&rth->dst, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2662 | RT_CACHE_STAT_INC(out_hit); |
| 2663 | rcu_read_unlock_bh(); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2664 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | } |
| 2666 | RT_CACHE_STAT_INC(out_hlist_search); |
| 2667 | } |
| 2668 | rcu_read_unlock_bh(); |
| 2669 | |
Neil Horman | 1080d70 | 2008-10-27 12:28:25 -0700 | [diff] [blame] | 2670 | slow_output: |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2671 | return ip_route_output_slow(net, flp4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2673 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
| 2674 | |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2675 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
| 2676 | { |
| 2677 | return NULL; |
| 2678 | } |
| 2679 | |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2680 | static unsigned int ipv4_blackhole_default_mtu(const struct dst_entry *dst) |
| 2681 | { |
| 2682 | return 0; |
| 2683 | } |
| 2684 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2685 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 2686 | { |
| 2687 | } |
| 2688 | |
| 2689 | static struct dst_ops ipv4_dst_blackhole_ops = { |
| 2690 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 2691 | .protocol = cpu_to_be16(ETH_P_IP), |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2692 | .destroy = ipv4_dst_destroy, |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2693 | .check = ipv4_blackhole_dst_check, |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2694 | .default_mtu = ipv4_blackhole_default_mtu, |
Eric Dumazet | 214f45c | 2011-02-18 11:39:01 -0800 | [diff] [blame] | 2695 | .default_advmss = ipv4_default_advmss, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2696 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2697 | }; |
| 2698 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2699 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2700 | { |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2701 | struct rtable *rt = dst_alloc(&ipv4_dst_blackhole_ops, 1); |
| 2702 | struct rtable *ort = (struct rtable *) dst_orig; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2703 | |
| 2704 | if (rt) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2705 | struct dst_entry *new = &rt->dst; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2706 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2707 | new->__use = 1; |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 2708 | new->input = dst_discard; |
| 2709 | new->output = dst_discard; |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 2710 | dst_copy_metrics(new, &ort->dst); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2711 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2712 | new->dev = ort->dst.dev; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2713 | if (new->dev) |
| 2714 | dev_hold(new->dev); |
| 2715 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2716 | rt->rt_key_dst = ort->rt_key_dst; |
| 2717 | rt->rt_key_src = ort->rt_key_src; |
| 2718 | rt->rt_tos = ort->rt_tos; |
| 2719 | rt->rt_iif = ort->rt_iif; |
| 2720 | rt->rt_oif = ort->rt_oif; |
| 2721 | rt->rt_mark = ort->rt_mark; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2722 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2723 | rt->rt_genid = rt_genid(net); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2724 | rt->rt_flags = ort->rt_flags; |
| 2725 | rt->rt_type = ort->rt_type; |
| 2726 | rt->rt_dst = ort->rt_dst; |
| 2727 | rt->rt_src = ort->rt_src; |
| 2728 | rt->rt_iif = ort->rt_iif; |
| 2729 | rt->rt_gateway = ort->rt_gateway; |
| 2730 | rt->rt_spec_dst = ort->rt_spec_dst; |
| 2731 | rt->peer = ort->peer; |
| 2732 | if (rt->peer) |
| 2733 | atomic_inc(&rt->peer->refcnt); |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 2734 | rt->fi = ort->fi; |
| 2735 | if (rt->fi) |
| 2736 | atomic_inc(&rt->fi->fib_clntref); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2737 | |
| 2738 | dst_free(new); |
| 2739 | } |
| 2740 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2741 | dst_release(dst_orig); |
| 2742 | |
| 2743 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2744 | } |
| 2745 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2746 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2747 | struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2748 | { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2749 | struct rtable *rt = __ip_route_output_key(net, flp4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2750 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2751 | if (IS_ERR(rt)) |
| 2752 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2754 | if (flp4->flowi4_proto) { |
| 2755 | if (!flp4->saddr) |
| 2756 | flp4->saddr = rt->rt_src; |
| 2757 | if (!flp4->daddr) |
| 2758 | flp4->daddr = rt->rt_dst; |
| 2759 | rt = (struct rtable *) xfrm_lookup(net, &rt->dst, |
| 2760 | flowi4_to_flowi(flp4), |
| 2761 | sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2762 | } |
| 2763 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2764 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2766 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
| 2767 | |
Benjamin Thery | 4feb88e | 2009-01-22 04:56:23 +0000 | [diff] [blame] | 2768 | static int rt_fill_info(struct net *net, |
| 2769 | struct sk_buff *skb, u32 pid, u32 seq, int event, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2770 | int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2772 | struct rtable *rt = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2773 | struct rtmsg *r; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2774 | struct nlmsghdr *nlh; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2775 | long expires; |
| 2776 | u32 id = 0, ts = 0, tsage = 0, error; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2777 | |
| 2778 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); |
| 2779 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2780 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2781 | |
| 2782 | r = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | r->rtm_family = AF_INET; |
| 2784 | r->rtm_dst_len = 32; |
| 2785 | r->rtm_src_len = 0; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2786 | r->rtm_tos = rt->rt_tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | r->rtm_table = RT_TABLE_MAIN; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2788 | NLA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | r->rtm_type = rt->rt_type; |
| 2790 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2791 | r->rtm_protocol = RTPROT_UNSPEC; |
| 2792 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 2793 | if (rt->rt_flags & RTCF_NOTIFY) |
| 2794 | r->rtm_flags |= RTM_F_NOTIFY; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2795 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2796 | NLA_PUT_BE32(skb, RTA_DST, rt->rt_dst); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2797 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2798 | if (rt->rt_key_src) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | r->rtm_src_len = 32; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2800 | NLA_PUT_BE32(skb, RTA_SRC, rt->rt_key_src); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2802 | if (rt->dst.dev) |
| 2803 | NLA_PUT_U32(skb, RTA_OIF, rt->dst.dev->ifindex); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2804 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2805 | if (rt->dst.tclassid) |
| 2806 | NLA_PUT_U32(skb, RTA_FLOW, rt->dst.tclassid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | #endif |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 2808 | if (rt_is_input_route(rt)) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2809 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_spec_dst); |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2810 | else if (rt->rt_src != rt->rt_key_src) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2811 | NLA_PUT_BE32(skb, RTA_PREFSRC, rt->rt_src); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2813 | if (rt->rt_dst != rt->rt_gateway) |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2814 | NLA_PUT_BE32(skb, RTA_GATEWAY, rt->rt_gateway); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2815 | |
David S. Miller | defb351 | 2010-12-08 21:16:57 -0800 | [diff] [blame] | 2816 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2817 | goto nla_put_failure; |
| 2818 | |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2819 | if (rt->rt_mark) |
| 2820 | NLA_PUT_BE32(skb, RTA_MARK, rt->rt_mark); |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2821 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2822 | error = rt->dst.error; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 2823 | expires = (rt->peer && rt->peer->pmtu_expires) ? |
| 2824 | rt->peer->pmtu_expires - jiffies : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2825 | if (rt->peer) { |
Eric Dumazet | 317fe0e | 2010-06-16 04:52:13 +0000 | [diff] [blame] | 2826 | inet_peer_refcheck(rt->peer); |
Eric Dumazet | 2c1409a | 2009-11-12 09:33:09 +0000 | [diff] [blame] | 2827 | id = atomic_read(&rt->peer->ip_id_count) & 0xffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2828 | if (rt->peer->tcp_ts_stamp) { |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2829 | ts = rt->peer->tcp_ts; |
James Morris | 9d729f7 | 2007-03-04 16:12:44 -0800 | [diff] [blame] | 2830 | tsage = get_seconds() - rt->peer->tcp_ts_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2831 | } |
| 2832 | } |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2833 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 2834 | if (rt_is_input_route(rt)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2835 | #ifdef CONFIG_IP_MROUTE |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 2836 | __be32 dst = rt->rt_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2837 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2838 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
Benjamin Thery | 4feb88e | 2009-01-22 04:56:23 +0000 | [diff] [blame] | 2839 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { |
| 2840 | int err = ipmr_get_route(net, skb, r, nowait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2841 | if (err <= 0) { |
| 2842 | if (!nowait) { |
| 2843 | if (err == 0) |
| 2844 | return 0; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2845 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2846 | } else { |
| 2847 | if (err == -EMSGSIZE) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2848 | goto nla_put_failure; |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2849 | error = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | } |
| 2851 | } |
| 2852 | } else |
| 2853 | #endif |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2854 | NLA_PUT_U32(skb, RTA_IIF, rt->rt_iif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2855 | } |
| 2856 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2857 | if (rtnl_put_cacheinfo(skb, &rt->dst, id, ts, tsage, |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2858 | expires, error) < 0) |
| 2859 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2861 | return nlmsg_end(skb, nlh); |
| 2862 | |
| 2863 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2864 | nlmsg_cancel(skb, nlh); |
| 2865 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | } |
| 2867 | |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 2868 | 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] | 2869 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2870 | struct net *net = sock_net(in_skb->sk); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2871 | struct rtmsg *rtm; |
| 2872 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | struct rtable *rt = NULL; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2874 | __be32 dst = 0; |
| 2875 | __be32 src = 0; |
| 2876 | u32 iif; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2877 | int err; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2878 | int mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2879 | struct sk_buff *skb; |
| 2880 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2881 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
| 2882 | if (err < 0) |
| 2883 | goto errout; |
| 2884 | |
| 2885 | rtm = nlmsg_data(nlh); |
| 2886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2888 | if (skb == NULL) { |
| 2889 | err = -ENOBUFS; |
| 2890 | goto errout; |
| 2891 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2892 | |
| 2893 | /* Reserve room for dummy headers, this skb can pass |
| 2894 | through good chunk of routing engine. |
| 2895 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 2896 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2897 | skb_reset_network_header(skb); |
Stephen Hemminger | d2c962b | 2006-04-17 17:27:11 -0700 | [diff] [blame] | 2898 | |
| 2899 | /* 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] | 2900 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
| 2902 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2903 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
| 2904 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2905 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2906 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2907 | |
| 2908 | if (iif) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2909 | struct net_device *dev; |
| 2910 | |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2911 | dev = __dev_get_by_index(net, iif); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2912 | if (dev == NULL) { |
| 2913 | err = -ENODEV; |
| 2914 | goto errout_free; |
| 2915 | } |
| 2916 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2917 | skb->protocol = htons(ETH_P_IP); |
| 2918 | skb->dev = dev; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2919 | skb->mark = mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2920 | local_bh_disable(); |
| 2921 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); |
| 2922 | local_bh_enable(); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2923 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2924 | rt = skb_rtable(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2925 | if (err == 0 && rt->dst.error) |
| 2926 | err = -rt->dst.error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2927 | } else { |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2928 | struct flowi4 fl4 = { |
| 2929 | .daddr = dst, |
| 2930 | .saddr = src, |
| 2931 | .flowi4_tos = rtm->rtm_tos, |
| 2932 | .flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0, |
| 2933 | .flowi4_mark = mark, |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2934 | }; |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2935 | rt = ip_route_output_key(net, &fl4); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2936 | |
| 2937 | err = 0; |
| 2938 | if (IS_ERR(rt)) |
| 2939 | err = PTR_ERR(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2940 | } |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2942 | if (err) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2943 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2945 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2946 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 2947 | rt->rt_flags |= RTCF_NOTIFY; |
| 2948 | |
Benjamin Thery | 4feb88e | 2009-01-22 04:56:23 +0000 | [diff] [blame] | 2949 | err = rt_fill_info(net, skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2950 | RTM_NEWROUTE, 0, 0); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2951 | if (err <= 0) |
| 2952 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2953 | |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2954 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2955 | errout: |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2956 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2958 | errout_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2959 | kfree_skb(skb); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2960 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2961 | } |
| 2962 | |
| 2963 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 2964 | { |
| 2965 | struct rtable *rt; |
| 2966 | int h, s_h; |
| 2967 | int idx, s_idx; |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2968 | struct net *net; |
| 2969 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2970 | net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2971 | |
| 2972 | s_h = cb->args[0]; |
Eric Dumazet | d8c9283 | 2008-01-07 21:52:14 -0800 | [diff] [blame] | 2973 | if (s_h < 0) |
| 2974 | s_h = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2975 | s_idx = idx = cb->args[1]; |
Eric Dumazet | a627266 | 2008-08-28 01:11:25 -0700 | [diff] [blame] | 2976 | for (h = s_h; h <= rt_hash_mask; h++, s_idx = 0) { |
| 2977 | if (!rt_hash_table[h].chain) |
| 2978 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | rcu_read_lock_bh(); |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 2980 | for (rt = rcu_dereference_bh(rt_hash_table[h].chain), idx = 0; rt; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2981 | rt = rcu_dereference_bh(rt->dst.rt_next), idx++) { |
| 2982 | if (!net_eq(dev_net(rt->dst.dev), net) || idx < s_idx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2983 | continue; |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2984 | if (rt_is_expired(rt)) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 2985 | continue; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2986 | skb_dst_set_noref(skb, &rt->dst); |
Benjamin Thery | 4feb88e | 2009-01-22 04:56:23 +0000 | [diff] [blame] | 2987 | if (rt_fill_info(net, skb, NETLINK_CB(cb->skb).pid, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2988 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2989 | 1, NLM_F_MULTI) <= 0) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 2990 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2991 | rcu_read_unlock_bh(); |
| 2992 | goto done; |
| 2993 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 2994 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2995 | } |
| 2996 | rcu_read_unlock_bh(); |
| 2997 | } |
| 2998 | |
| 2999 | done: |
| 3000 | cb->args[0] = h; |
| 3001 | cb->args[1] = idx; |
| 3002 | return skb->len; |
| 3003 | } |
| 3004 | |
| 3005 | void ip_rt_multicast_event(struct in_device *in_dev) |
| 3006 | { |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 3007 | rt_cache_flush(dev_net(in_dev->dev), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | } |
| 3009 | |
| 3010 | #ifdef CONFIG_SYSCTL |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 3011 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 3012 | void __user *buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3013 | size_t *lenp, loff_t *ppos) |
| 3014 | { |
| 3015 | if (write) { |
Denis V. Lunev | 639e104 | 2008-07-05 19:02:06 -0700 | [diff] [blame] | 3016 | int flush_delay; |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 3017 | ctl_table ctl; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3018 | struct net *net; |
Denis V. Lunev | 639e104 | 2008-07-05 19:02:06 -0700 | [diff] [blame] | 3019 | |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 3020 | memcpy(&ctl, __ctl, sizeof(ctl)); |
| 3021 | ctl.data = &flush_delay; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 3022 | proc_dointvec(&ctl, write, buffer, lenp, ppos); |
Denis V. Lunev | 639e104 | 2008-07-05 19:02:06 -0700 | [diff] [blame] | 3023 | |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 3024 | net = (struct net *)__ctl->extra1; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3025 | rt_cache_flush(net, flush_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 3027 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | |
| 3029 | return -EINVAL; |
| 3030 | } |
| 3031 | |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 3032 | static ctl_table ipv4_route_table[] = { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 3033 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3034 | .procname = "gc_thresh", |
| 3035 | .data = &ipv4_dst_ops.gc_thresh, |
| 3036 | .maxlen = sizeof(int), |
| 3037 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3038 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3039 | }, |
| 3040 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3041 | .procname = "max_size", |
| 3042 | .data = &ip_rt_max_size, |
| 3043 | .maxlen = sizeof(int), |
| 3044 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3045 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | }, |
| 3047 | { |
| 3048 | /* Deprecated. Use gc_min_interval_ms */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 3049 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3050 | .procname = "gc_min_interval", |
| 3051 | .data = &ip_rt_gc_min_interval, |
| 3052 | .maxlen = sizeof(int), |
| 3053 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3054 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | }, |
| 3056 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3057 | .procname = "gc_min_interval_ms", |
| 3058 | .data = &ip_rt_gc_min_interval, |
| 3059 | .maxlen = sizeof(int), |
| 3060 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3061 | .proc_handler = proc_dointvec_ms_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3062 | }, |
| 3063 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3064 | .procname = "gc_timeout", |
| 3065 | .data = &ip_rt_gc_timeout, |
| 3066 | .maxlen = sizeof(int), |
| 3067 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3068 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | }, |
| 3070 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | .procname = "gc_interval", |
| 3072 | .data = &ip_rt_gc_interval, |
| 3073 | .maxlen = sizeof(int), |
| 3074 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3075 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3076 | }, |
| 3077 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3078 | .procname = "redirect_load", |
| 3079 | .data = &ip_rt_redirect_load, |
| 3080 | .maxlen = sizeof(int), |
| 3081 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3082 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3083 | }, |
| 3084 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3085 | .procname = "redirect_number", |
| 3086 | .data = &ip_rt_redirect_number, |
| 3087 | .maxlen = sizeof(int), |
| 3088 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3089 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3090 | }, |
| 3091 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3092 | .procname = "redirect_silence", |
| 3093 | .data = &ip_rt_redirect_silence, |
| 3094 | .maxlen = sizeof(int), |
| 3095 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3096 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3097 | }, |
| 3098 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3099 | .procname = "error_cost", |
| 3100 | .data = &ip_rt_error_cost, |
| 3101 | .maxlen = sizeof(int), |
| 3102 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3103 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3104 | }, |
| 3105 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3106 | .procname = "error_burst", |
| 3107 | .data = &ip_rt_error_burst, |
| 3108 | .maxlen = sizeof(int), |
| 3109 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3110 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | }, |
| 3112 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3113 | .procname = "gc_elasticity", |
| 3114 | .data = &ip_rt_gc_elasticity, |
| 3115 | .maxlen = sizeof(int), |
| 3116 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3117 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3118 | }, |
| 3119 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3120 | .procname = "mtu_expires", |
| 3121 | .data = &ip_rt_mtu_expires, |
| 3122 | .maxlen = sizeof(int), |
| 3123 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3124 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3125 | }, |
| 3126 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | .procname = "min_pmtu", |
| 3128 | .data = &ip_rt_min_pmtu, |
| 3129 | .maxlen = sizeof(int), |
| 3130 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3131 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | }, |
| 3133 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3134 | .procname = "min_adv_mss", |
| 3135 | .data = &ip_rt_min_advmss, |
| 3136 | .maxlen = sizeof(int), |
| 3137 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3138 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3139 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3140 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3141 | }; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3142 | |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3143 | static struct ctl_table empty[1]; |
| 3144 | |
| 3145 | static struct ctl_table ipv4_skeleton[] = |
| 3146 | { |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3147 | { .procname = "route", |
Hugh Dickins | d994af0 | 2008-08-27 02:35:18 -0700 | [diff] [blame] | 3148 | .mode = 0555, .child = ipv4_route_table}, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3149 | { .procname = "neigh", |
Hugh Dickins | d994af0 | 2008-08-27 02:35:18 -0700 | [diff] [blame] | 3150 | .mode = 0555, .child = empty}, |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3151 | { } |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3152 | }; |
| 3153 | |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3154 | static __net_initdata struct ctl_path ipv4_path[] = { |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3155 | { .procname = "net", }, |
| 3156 | { .procname = "ipv4", }, |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3157 | { }, |
| 3158 | }; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3159 | |
| 3160 | static struct ctl_table ipv4_route_flush_table[] = { |
| 3161 | { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3162 | .procname = "flush", |
| 3163 | .maxlen = sizeof(int), |
| 3164 | .mode = 0200, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3165 | .proc_handler = ipv4_sysctl_rtcache_flush, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3166 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3167 | { }, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3168 | }; |
| 3169 | |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3170 | static __net_initdata struct ctl_path ipv4_route_path[] = { |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3171 | { .procname = "net", }, |
| 3172 | { .procname = "ipv4", }, |
| 3173 | { .procname = "route", }, |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3174 | { }, |
| 3175 | }; |
| 3176 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3177 | static __net_init int sysctl_route_net_init(struct net *net) |
| 3178 | { |
| 3179 | struct ctl_table *tbl; |
| 3180 | |
| 3181 | tbl = ipv4_route_flush_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 3182 | if (!net_eq(net, &init_net)) { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3183 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
| 3184 | if (tbl == NULL) |
| 3185 | goto err_dup; |
| 3186 | } |
| 3187 | tbl[0].extra1 = net; |
| 3188 | |
| 3189 | net->ipv4.route_hdr = |
| 3190 | register_net_sysctl_table(net, ipv4_route_path, tbl); |
| 3191 | if (net->ipv4.route_hdr == NULL) |
| 3192 | goto err_reg; |
| 3193 | return 0; |
| 3194 | |
| 3195 | err_reg: |
| 3196 | if (tbl != ipv4_route_flush_table) |
| 3197 | kfree(tbl); |
| 3198 | err_dup: |
| 3199 | return -ENOMEM; |
| 3200 | } |
| 3201 | |
| 3202 | static __net_exit void sysctl_route_net_exit(struct net *net) |
| 3203 | { |
| 3204 | struct ctl_table *tbl; |
| 3205 | |
| 3206 | tbl = net->ipv4.route_hdr->ctl_table_arg; |
| 3207 | unregister_net_sysctl_table(net->ipv4.route_hdr); |
| 3208 | BUG_ON(tbl == ipv4_route_flush_table); |
| 3209 | kfree(tbl); |
| 3210 | } |
| 3211 | |
| 3212 | static __net_initdata struct pernet_operations sysctl_route_ops = { |
| 3213 | .init = sysctl_route_net_init, |
| 3214 | .exit = sysctl_route_net_exit, |
| 3215 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3216 | #endif |
| 3217 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 3218 | static __net_init int rt_genid_init(struct net *net) |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 3219 | { |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 3220 | get_random_bytes(&net->ipv4.rt_genid, |
| 3221 | sizeof(net->ipv4.rt_genid)); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame^] | 3222 | get_random_bytes(&net->ipv4.dev_addr_genid, |
| 3223 | sizeof(net->ipv4.dev_addr_genid)); |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 3224 | return 0; |
| 3225 | } |
| 3226 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 3227 | static __net_initdata struct pernet_operations rt_genid_ops = { |
| 3228 | .init = rt_genid_init, |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 3229 | }; |
| 3230 | |
| 3231 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 3232 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Tejun Heo | 7d720c3 | 2010-02-16 15:20:26 +0000 | [diff] [blame] | 3233 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 3234 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3235 | |
| 3236 | static __initdata unsigned long rhash_entries; |
| 3237 | static int __init set_rhash_entries(char *str) |
| 3238 | { |
| 3239 | if (!str) |
| 3240 | return 0; |
| 3241 | rhash_entries = simple_strtoul(str, &str, 0); |
| 3242 | return 1; |
| 3243 | } |
| 3244 | __setup("rhash_entries=", set_rhash_entries); |
| 3245 | |
| 3246 | int __init ip_rt_init(void) |
| 3247 | { |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3248 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3249 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 3250 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Ingo Molnar | 0dcec8c | 2009-02-25 14:07:33 +0100 | [diff] [blame] | 3251 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3252 | if (!ip_rt_acct) |
| 3253 | panic("IP: failed to allocate ip_rt_acct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3254 | #endif |
| 3255 | |
Alexey Dobriyan | e5d679f | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 3256 | ipv4_dst_ops.kmem_cachep = |
| 3257 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 3258 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3259 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 3260 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
| 3261 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 3262 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
| 3263 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); |
| 3264 | |
| 3265 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) |
| 3266 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); |
| 3267 | |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3268 | rt_hash_table = (struct rt_hash_bucket *) |
| 3269 | alloc_large_system_hash("IP route cache", |
| 3270 | sizeof(struct rt_hash_bucket), |
| 3271 | rhash_entries, |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 3272 | (totalram_pages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 3273 | 15 : 17, |
Kirill Korotaev | 8d1502d | 2006-08-07 20:44:22 -0700 | [diff] [blame] | 3274 | 0, |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 3275 | &rt_hash_log, |
| 3276 | &rt_hash_mask, |
Anton Blanchard | c9503e0 | 2009-04-27 05:42:24 -0700 | [diff] [blame] | 3277 | rhash_entries ? 0 : 512 * 1024); |
Eric Dumazet | 22c047c | 2005-07-05 14:55:24 -0700 | [diff] [blame] | 3278 | memset(rt_hash_table, 0, (rt_hash_mask + 1) * sizeof(struct rt_hash_bucket)); |
| 3279 | rt_hash_lock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3280 | |
| 3281 | ipv4_dst_ops.gc_thresh = (rt_hash_mask + 1); |
| 3282 | ip_rt_max_size = (rt_hash_mask + 1) * 16; |
| 3283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3284 | devinet_init(); |
| 3285 | ip_fib_init(); |
| 3286 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 3287 | if (ip_rt_proc_init()) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 3288 | printk(KERN_ERR "Unable to create route proc files\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3289 | #ifdef CONFIG_XFRM |
| 3290 | xfrm_init(); |
Neil Horman | a33bc5c | 2009-07-30 18:52:15 -0700 | [diff] [blame] | 3291 | xfrm4_init(ip_rt_max_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3292 | #endif |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 3293 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL); |
| 3294 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3295 | #ifdef CONFIG_SYSCTL |
| 3296 | register_pernet_subsys(&sysctl_route_ops); |
| 3297 | #endif |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 3298 | register_pernet_subsys(&rt_genid_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3299 | return rc; |
| 3300 | } |
| 3301 | |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 3302 | #ifdef CONFIG_SYSCTL |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 3303 | /* |
| 3304 | * We really need to sanitize the damn ipv4 init order, then all |
| 3305 | * this nonsense will go away. |
| 3306 | */ |
| 3307 | void __init ip_static_sysctl_init(void) |
| 3308 | { |
Al Viro | 2f4520d | 2008-08-25 15:17:44 -0700 | [diff] [blame] | 3309 | register_sysctl_paths(ipv4_path, ipv4_skeleton); |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 3310 | } |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 3311 | #endif |