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 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 65 | #define pr_fmt(fmt) "IPv4: " fmt |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <linux/module.h> |
| 68 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <linux/bitops.h> |
| 70 | #include <linux/types.h> |
| 71 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #include <linux/mm.h> |
| 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> |
| 82 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #include <linux/inetdevice.h> |
| 84 | #include <linux/igmp.h> |
| 85 | #include <linux/pkt_sched.h> |
| 86 | #include <linux/mroute.h> |
| 87 | #include <linux/netfilter_ipv4.h> |
| 88 | #include <linux/random.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #include <linux/rcupdate.h> |
| 90 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 91 | #include <linux/slab.h> |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 92 | #include <net/dst.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 93 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #include <net/protocol.h> |
| 95 | #include <net/ip.h> |
| 96 | #include <net/route.h> |
| 97 | #include <net/inetpeer.h> |
| 98 | #include <net/sock.h> |
| 99 | #include <net/ip_fib.h> |
| 100 | #include <net/arp.h> |
| 101 | #include <net/tcp.h> |
| 102 | #include <net/icmp.h> |
| 103 | #include <net/xfrm.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 104 | #include <net/netevent.h> |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 105 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #ifdef CONFIG_SYSCTL |
| 107 | #include <linux/sysctl.h> |
Shan Wei | 7426a56 | 2012-04-18 18:05:46 +0000 | [diff] [blame] | 108 | #include <linux/kmemleak.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #endif |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 110 | #include <net/secure_seq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 112 | #define RT_FL_TOS(oldflp4) \ |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 113 | ((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; |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 121 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
Stephen Hemminger | 817bc4d | 2008-03-22 17:43:59 -0700 | [diff] [blame] | 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; |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * Interface to generic destination cache. |
| 135 | */ |
| 136 | |
| 137 | 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] | 138 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 139 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
| 141 | static void ipv4_link_failure(struct sk_buff *skb); |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 142 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 143 | struct sk_buff *skb, u32 mtu); |
| 144 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, |
| 145 | struct sk_buff *skb); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 146 | static void ipv4_dst_destroy(struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Eric Dumazet | 72cdd1d | 2010-11-11 07:14:07 +0000 | [diff] [blame] | 148 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 149 | int how) |
| 150 | { |
| 151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 153 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
| 154 | { |
David S. Miller | 3124873 | 2012-07-10 07:08:18 -0700 | [diff] [blame] | 155 | WARN_ON(1); |
| 156 | return NULL; |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 157 | } |
| 158 | |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 159 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
| 160 | struct sk_buff *skb, |
| 161 | const void *daddr); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | static struct dst_ops ipv4_dst_ops = { |
| 164 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 165 | .protocol = cpu_to_be16(ETH_P_IP), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | .check = ipv4_dst_check, |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 167 | .default_advmss = ipv4_default_advmss, |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 168 | .mtu = ipv4_mtu, |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 169 | .cow_metrics = ipv4_cow_metrics, |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 170 | .destroy = ipv4_dst_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | .ifdown = ipv4_dst_ifdown, |
| 172 | .negative_advice = ipv4_negative_advice, |
| 173 | .link_failure = ipv4_link_failure, |
| 174 | .update_pmtu = ip_rt_update_pmtu, |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 175 | .redirect = ip_do_redirect, |
Herbert Xu | 1ac06e0 | 2008-05-20 14:32:14 -0700 | [diff] [blame] | 176 | .local_out = __ip_local_out, |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 177 | .neigh_lookup = ipv4_neigh_lookup, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | }; |
| 179 | |
| 180 | #define ECN_OR_COST(class) TC_PRIO_##class |
| 181 | |
Philippe De Muyter | 4839c52 | 2007-07-09 15:32:57 -0700 | [diff] [blame] | 182 | const __u8 ip_tos2prio[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | TC_PRIO_BESTEFFORT, |
Dan Siemon | 4a2b9c3 | 2011-03-15 13:56:07 +0000 | [diff] [blame] | 184 | ECN_OR_COST(BESTEFFORT), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | TC_PRIO_BESTEFFORT, |
| 186 | ECN_OR_COST(BESTEFFORT), |
| 187 | TC_PRIO_BULK, |
| 188 | ECN_OR_COST(BULK), |
| 189 | TC_PRIO_BULK, |
| 190 | ECN_OR_COST(BULK), |
| 191 | TC_PRIO_INTERACTIVE, |
| 192 | ECN_OR_COST(INTERACTIVE), |
| 193 | TC_PRIO_INTERACTIVE, |
| 194 | ECN_OR_COST(INTERACTIVE), |
| 195 | TC_PRIO_INTERACTIVE_BULK, |
| 196 | ECN_OR_COST(INTERACTIVE_BULK), |
| 197 | TC_PRIO_INTERACTIVE_BULK, |
| 198 | ECN_OR_COST(INTERACTIVE_BULK) |
| 199 | }; |
Amir Vadai | d4a9686 | 2012-04-04 21:33:28 +0000 | [diff] [blame] | 200 | EXPORT_SYMBOL(ip_tos2prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 202 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
Eric Dumazet | 27f39c73e | 2010-05-19 22:07:23 +0000 | [diff] [blame] | 203 | #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] | 204 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 205 | static inline int rt_genid(struct net *net) |
| 206 | { |
| 207 | return atomic_read(&net->ipv4.rt_genid); |
| 208 | } |
| 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 212 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 213 | if (*pos) |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 214 | return NULL; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 215 | return SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 219 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | ++*pos; |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 221 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 225 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | static int rt_cache_seq_show(struct seq_file *seq, void *v) |
| 229 | { |
| 230 | if (v == SEQ_START_TOKEN) |
| 231 | seq_printf(seq, "%-127s\n", |
| 232 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" |
| 233 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" |
| 234 | "HHUptod\tSpecDst"); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 235 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 238 | static const struct seq_operations rt_cache_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | .start = rt_cache_seq_start, |
| 240 | .next = rt_cache_seq_next, |
| 241 | .stop = rt_cache_seq_stop, |
| 242 | .show = rt_cache_seq_show, |
| 243 | }; |
| 244 | |
| 245 | static int rt_cache_seq_open(struct inode *inode, struct file *file) |
| 246 | { |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 247 | return seq_open(file, &rt_cache_seq_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 250 | static const struct file_operations rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | .owner = THIS_MODULE, |
| 252 | .open = rt_cache_seq_open, |
| 253 | .read = seq_read, |
| 254 | .llseek = seq_lseek, |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 255 | .release = seq_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | }; |
| 257 | |
| 258 | |
| 259 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 260 | { |
| 261 | int cpu; |
| 262 | |
| 263 | if (*pos == 0) |
| 264 | return SEQ_START_TOKEN; |
| 265 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 266 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | if (!cpu_possible(cpu)) |
| 268 | continue; |
| 269 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 270 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | return NULL; |
| 273 | } |
| 274 | |
| 275 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 276 | { |
| 277 | int cpu; |
| 278 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 279 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | if (!cpu_possible(cpu)) |
| 281 | continue; |
| 282 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 283 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | return NULL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) |
| 290 | { |
| 291 | |
| 292 | } |
| 293 | |
| 294 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) |
| 295 | { |
| 296 | struct rt_cache_stat *st = v; |
| 297 | |
| 298 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 299 | 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] | 300 | return 0; |
| 301 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
| 304 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 305 | dst_entries_get_slow(&ipv4_dst_ops), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | st->in_hit, |
| 307 | st->in_slow_tot, |
| 308 | st->in_slow_mc, |
| 309 | st->in_no_route, |
| 310 | st->in_brd, |
| 311 | st->in_martian_dst, |
| 312 | st->in_martian_src, |
| 313 | |
| 314 | st->out_hit, |
| 315 | st->out_slow_tot, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 316 | st->out_slow_mc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | st->gc_total, |
| 319 | st->gc_ignored, |
| 320 | st->gc_goal_miss, |
| 321 | st->gc_dst_overflow, |
| 322 | st->in_hlist_search, |
| 323 | st->out_hlist_search |
| 324 | ); |
| 325 | return 0; |
| 326 | } |
| 327 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 328 | static const struct seq_operations rt_cpu_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | .start = rt_cpu_seq_start, |
| 330 | .next = rt_cpu_seq_next, |
| 331 | .stop = rt_cpu_seq_stop, |
| 332 | .show = rt_cpu_seq_show, |
| 333 | }; |
| 334 | |
| 335 | |
| 336 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) |
| 337 | { |
| 338 | return seq_open(file, &rt_cpu_seq_ops); |
| 339 | } |
| 340 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 341 | static const struct file_operations rt_cpu_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | .owner = THIS_MODULE, |
| 343 | .open = rt_cpu_seq_open, |
| 344 | .read = seq_read, |
| 345 | .llseek = seq_lseek, |
| 346 | .release = seq_release, |
| 347 | }; |
| 348 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 349 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 350 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 351 | { |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 352 | struct ip_rt_acct *dst, *src; |
| 353 | unsigned int i, j; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 354 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 355 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); |
| 356 | if (!dst) |
| 357 | return -ENOMEM; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 358 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 359 | for_each_possible_cpu(i) { |
| 360 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); |
| 361 | for (j = 0; j < 256; j++) { |
| 362 | dst[j].o_bytes += src[j].o_bytes; |
| 363 | dst[j].o_packets += src[j].o_packets; |
| 364 | dst[j].i_bytes += src[j].i_bytes; |
| 365 | dst[j].i_packets += src[j].i_packets; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 366 | } |
| 367 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 368 | |
| 369 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
| 370 | kfree(dst); |
| 371 | return 0; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 372 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 373 | |
| 374 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
| 375 | { |
| 376 | return single_open(file, rt_acct_proc_show, NULL); |
| 377 | } |
| 378 | |
| 379 | static const struct file_operations rt_acct_proc_fops = { |
| 380 | .owner = THIS_MODULE, |
| 381 | .open = rt_acct_proc_open, |
| 382 | .read = seq_read, |
| 383 | .llseek = seq_lseek, |
| 384 | .release = single_release, |
| 385 | }; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 386 | #endif |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 387 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 388 | static int __net_init ip_rt_do_proc_init(struct net *net) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 389 | { |
| 390 | struct proc_dir_entry *pde; |
| 391 | |
| 392 | pde = proc_net_fops_create(net, "rt_cache", S_IRUGO, |
| 393 | &rt_cache_seq_fops); |
| 394 | if (!pde) |
| 395 | goto err1; |
| 396 | |
Wang Chen | 7702072 | 2008-02-28 14:14:25 -0800 | [diff] [blame] | 397 | pde = proc_create("rt_cache", S_IRUGO, |
| 398 | net->proc_net_stat, &rt_cpu_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 399 | if (!pde) |
| 400 | goto err2; |
| 401 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 402 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 403 | 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] | 404 | if (!pde) |
| 405 | goto err3; |
| 406 | #endif |
| 407 | return 0; |
| 408 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 409 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 410 | err3: |
| 411 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 412 | #endif |
| 413 | err2: |
| 414 | remove_proc_entry("rt_cache", net->proc_net); |
| 415 | err1: |
| 416 | return -ENOMEM; |
| 417 | } |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 418 | |
| 419 | static void __net_exit ip_rt_do_proc_exit(struct net *net) |
| 420 | { |
| 421 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 422 | remove_proc_entry("rt_cache", net->proc_net); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 423 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 424 | remove_proc_entry("rt_acct", net->proc_net); |
Alexey Dobriyan | 0a931ac | 2010-01-17 03:32:50 +0000 | [diff] [blame] | 425 | #endif |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { |
| 429 | .init = ip_rt_do_proc_init, |
| 430 | .exit = ip_rt_do_proc_exit, |
| 431 | }; |
| 432 | |
| 433 | static int __init ip_rt_proc_init(void) |
| 434 | { |
| 435 | return register_pernet_subsys(&ip_rt_proc_ops); |
| 436 | } |
| 437 | |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 438 | #else |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 439 | static inline int ip_rt_proc_init(void) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 440 | { |
| 441 | return 0; |
| 442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | #endif /* CONFIG_PROC_FS */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 444 | |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 445 | static inline bool rt_is_expired(const struct rtable *rth) |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 446 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 447 | return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 448 | } |
| 449 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 450 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 451 | * Perturbation of rt_genid by a small quantity [1..256] |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 452 | * Using 8 bits of shuffling ensure we can call rt_cache_invalidate() |
| 453 | * many times (2^24) without giving recent rt_genid. |
| 454 | * 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] | 455 | */ |
Denis V. Lunev | 86c657f | 2008-07-05 19:03:31 -0700 | [diff] [blame] | 456 | static void rt_cache_invalidate(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 458 | unsigned char shuffle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 460 | get_random_bytes(&shuffle, sizeof(shuffle)); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 461 | atomic_add(shuffle + 1U, &net->ipv4.rt_genid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Eric Dumazet | beb659b | 2007-11-19 22:43:37 -0800 | [diff] [blame] | 464 | /* |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 465 | * delay < 0 : invalidate cache (fast : entries will be deleted later) |
| 466 | * delay >= 0 : invalidate & flush cache (can be long) |
| 467 | */ |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 468 | void rt_cache_flush(struct net *net, int delay) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 469 | { |
Denis V. Lunev | 86c657f | 2008-07-05 19:03:31 -0700 | [diff] [blame] | 470 | rt_cache_invalidate(net); |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 471 | } |
| 472 | |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 473 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
| 474 | struct sk_buff *skb, |
| 475 | const void *daddr) |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 476 | { |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 477 | struct net_device *dev = dst->dev; |
| 478 | const __be32 *pkey = daddr; |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 479 | const struct rtable *rt; |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 480 | struct neighbour *n; |
| 481 | |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 482 | rt = (const struct rtable *) dst; |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 483 | if (rt->rt_gateway) |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 484 | pkey = (const __be32 *) &rt->rt_gateway; |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 485 | else if (skb) |
| 486 | pkey = &ip_hdr(skb)->daddr; |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 487 | |
David S. Miller | 80703d2 | 2012-02-15 17:48:35 -0500 | [diff] [blame] | 488 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 489 | if (n) |
| 490 | return n; |
David Miller | 32092ec | 2011-07-25 00:01:41 +0000 | [diff] [blame] | 491 | return neigh_create(&arp_tbl, pkey, dev); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 492 | } |
| 493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | /* |
| 495 | * Peer allocation may fail only in serious out-of-memory conditions. However |
| 496 | * we still can generate some output. |
| 497 | * Random ID selection looks a bit dangerous because we have no chances to |
| 498 | * select ID being unique in a reasonable period of time. |
| 499 | * But broken packet identifier may be better than no packet at all. |
| 500 | */ |
| 501 | static void ip_select_fb_ident(struct iphdr *iph) |
| 502 | { |
| 503 | static DEFINE_SPINLOCK(ip_fb_id_lock); |
| 504 | static u32 ip_fallback_id; |
| 505 | u32 salt; |
| 506 | |
| 507 | spin_lock_bh(&ip_fb_id_lock); |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 508 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | iph->id = htons(salt & 0xFFFF); |
| 510 | ip_fallback_id = salt; |
| 511 | spin_unlock_bh(&ip_fb_id_lock); |
| 512 | } |
| 513 | |
| 514 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) |
| 515 | { |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 516 | struct net *net = dev_net(dst->dev); |
| 517 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 519 | peer = inet_getpeer_v4(net->ipv4.peers, iph->daddr, 1); |
| 520 | if (peer) { |
| 521 | iph->id = htons(inet_getid(peer, more)); |
| 522 | inet_putpeer(peer); |
| 523 | return; |
| 524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | ip_select_fb_ident(iph); |
| 527 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 528 | EXPORT_SYMBOL(__ip_select_ident); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 530 | static void __build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 531 | const struct iphdr *iph, |
| 532 | int oif, u8 tos, |
| 533 | u8 prot, u32 mark, int flow_flags) |
| 534 | { |
| 535 | if (sk) { |
| 536 | const struct inet_sock *inet = inet_sk(sk); |
| 537 | |
| 538 | oif = sk->sk_bound_dev_if; |
| 539 | mark = sk->sk_mark; |
| 540 | tos = RT_CONN_FLAGS(sk); |
| 541 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; |
| 542 | } |
| 543 | flowi4_init_output(fl4, oif, mark, tos, |
| 544 | RT_SCOPE_UNIVERSE, prot, |
| 545 | flow_flags, |
| 546 | iph->daddr, iph->saddr, 0, 0); |
| 547 | } |
| 548 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 549 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
| 550 | const struct sock *sk) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 551 | { |
| 552 | const struct iphdr *iph = ip_hdr(skb); |
| 553 | int oif = skb->dev->ifindex; |
| 554 | u8 tos = RT_TOS(iph->tos); |
| 555 | u8 prot = iph->protocol; |
| 556 | u32 mark = skb->mark; |
| 557 | |
| 558 | __build_flow_key(fl4, sk, iph, oif, tos, prot, mark, 0); |
| 559 | } |
| 560 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 561 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 562 | { |
| 563 | const struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 564 | const struct ip_options_rcu *inet_opt; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 565 | __be32 daddr = inet->inet_daddr; |
| 566 | |
| 567 | rcu_read_lock(); |
| 568 | inet_opt = rcu_dereference(inet->inet_opt); |
| 569 | if (inet_opt && inet_opt->opt.srr) |
| 570 | daddr = inet_opt->opt.faddr; |
| 571 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, |
| 572 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
| 573 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, |
| 574 | inet_sk_flowi_flags(sk), |
| 575 | daddr, inet->inet_saddr, 0, 0); |
| 576 | rcu_read_unlock(); |
| 577 | } |
| 578 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 579 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
| 580 | const struct sk_buff *skb) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 581 | { |
| 582 | if (skb) |
| 583 | build_skb_flow_key(fl4, skb, sk); |
| 584 | else |
| 585 | build_sk_flow_key(fl4, sk); |
| 586 | } |
| 587 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 588 | static inline void rt_free(struct rtable *rt) |
| 589 | { |
| 590 | call_rcu(&rt->dst.rcu_head, dst_rcu_free); |
| 591 | } |
| 592 | |
| 593 | static DEFINE_SPINLOCK(fnhe_lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 594 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 595 | static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 596 | { |
| 597 | struct fib_nh_exception *fnhe, *oldest; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 598 | struct rtable *orig; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 599 | |
| 600 | oldest = rcu_dereference(hash->chain); |
| 601 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; |
| 602 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
| 603 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) |
| 604 | oldest = fnhe; |
| 605 | } |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 606 | orig = rcu_dereference(oldest->fnhe_rth); |
| 607 | if (orig) { |
| 608 | RCU_INIT_POINTER(oldest->fnhe_rth, NULL); |
| 609 | rt_free(orig); |
| 610 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 611 | return oldest; |
| 612 | } |
| 613 | |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 614 | static inline u32 fnhe_hashfun(__be32 daddr) |
| 615 | { |
| 616 | u32 hval; |
| 617 | |
| 618 | hval = (__force u32) daddr; |
| 619 | hval ^= (hval >> 11) ^ (hval >> 22); |
| 620 | |
| 621 | return hval & (FNHE_HASH_SIZE - 1); |
| 622 | } |
| 623 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 624 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
| 625 | u32 pmtu, unsigned long expires) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 626 | { |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 627 | struct fnhe_hash_bucket *hash; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 628 | struct fib_nh_exception *fnhe; |
| 629 | int depth; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 630 | u32 hval = fnhe_hashfun(daddr); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 631 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 632 | spin_lock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 633 | |
| 634 | hash = nh->nh_exceptions; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 635 | if (!hash) { |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 636 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 637 | if (!hash) |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 638 | goto out_unlock; |
| 639 | nh->nh_exceptions = hash; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 640 | } |
| 641 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 642 | hash += hval; |
| 643 | |
| 644 | depth = 0; |
| 645 | for (fnhe = rcu_dereference(hash->chain); fnhe; |
| 646 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
| 647 | if (fnhe->fnhe_daddr == daddr) |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 648 | break; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 649 | depth++; |
| 650 | } |
| 651 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 652 | if (fnhe) { |
| 653 | if (gw) |
| 654 | fnhe->fnhe_gw = gw; |
| 655 | if (pmtu) { |
| 656 | fnhe->fnhe_pmtu = pmtu; |
| 657 | fnhe->fnhe_expires = expires; |
| 658 | } |
| 659 | } else { |
| 660 | if (depth > FNHE_RECLAIM_DEPTH) |
| 661 | fnhe = fnhe_oldest(hash); |
| 662 | else { |
| 663 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); |
| 664 | if (!fnhe) |
| 665 | goto out_unlock; |
| 666 | |
| 667 | fnhe->fnhe_next = hash->chain; |
| 668 | rcu_assign_pointer(hash->chain, fnhe); |
| 669 | } |
| 670 | fnhe->fnhe_daddr = daddr; |
| 671 | fnhe->fnhe_gw = gw; |
| 672 | fnhe->fnhe_pmtu = pmtu; |
| 673 | fnhe->fnhe_expires = expires; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 674 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 675 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 676 | fnhe->fnhe_stamp = jiffies; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 677 | |
| 678 | out_unlock: |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 679 | spin_unlock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 680 | return; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 681 | } |
| 682 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 683 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
| 684 | bool kill_route) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 686 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
David S. Miller | 9420612 | 2012-07-11 20:38:08 -0700 | [diff] [blame] | 687 | __be32 old_gw = ip_hdr(skb)->saddr; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 688 | struct net_device *dev = skb->dev; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 689 | struct in_device *in_dev; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 690 | struct fib_result res; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 691 | struct neighbour *n; |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 692 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
David S. Miller | 9420612 | 2012-07-11 20:38:08 -0700 | [diff] [blame] | 694 | switch (icmp_hdr(skb)->code & 7) { |
| 695 | case ICMP_REDIR_NET: |
| 696 | case ICMP_REDIR_NETTOS: |
| 697 | case ICMP_REDIR_HOST: |
| 698 | case ICMP_REDIR_HOSTTOS: |
| 699 | break; |
| 700 | |
| 701 | default: |
| 702 | return; |
| 703 | } |
| 704 | |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 705 | if (rt->rt_gateway != old_gw) |
| 706 | return; |
| 707 | |
| 708 | in_dev = __in_dev_get_rcu(dev); |
| 709 | if (!in_dev) |
| 710 | return; |
| 711 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 712 | net = dev_net(dev); |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 713 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
| 714 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || |
| 715 | ipv4_is_zeronet(new_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | goto reject_redirect; |
| 717 | |
| 718 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
| 719 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) |
| 720 | goto reject_redirect; |
| 721 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) |
| 722 | goto reject_redirect; |
| 723 | } else { |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 724 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | goto reject_redirect; |
| 726 | } |
| 727 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 728 | n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw); |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 729 | if (n) { |
| 730 | if (!(n->nud_state & NUD_VALID)) { |
| 731 | neigh_event_send(n, NULL); |
| 732 | } else { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 733 | if (fib_lookup(net, fl4, &res) == 0) { |
| 734 | struct fib_nh *nh = &FIB_RES_NH(res); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 735 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 736 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
| 737 | 0, 0); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 738 | } |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 739 | if (kill_route) |
| 740 | rt->dst.obsolete = DST_OBSOLETE_KILL; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 741 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
| 742 | } |
| 743 | neigh_release(n); |
| 744 | } |
| 745 | return; |
| 746 | |
| 747 | reject_redirect: |
| 748 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
David S. Miller | 99ee038 | 2012-07-12 07:40:05 -0700 | [diff] [blame] | 749 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
| 750 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 751 | __be32 daddr = iph->daddr; |
| 752 | __be32 saddr = iph->saddr; |
| 753 | |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 754 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
| 755 | " Advised path = %pI4 -> %pI4\n", |
| 756 | &old_gw, dev->name, &new_gw, |
| 757 | &saddr, &daddr); |
David S. Miller | 99ee038 | 2012-07-12 07:40:05 -0700 | [diff] [blame] | 758 | } |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 759 | #endif |
| 760 | ; |
| 761 | } |
| 762 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 763 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
| 764 | { |
| 765 | struct rtable *rt; |
| 766 | struct flowi4 fl4; |
| 767 | |
| 768 | rt = (struct rtable *) dst; |
| 769 | |
| 770 | ip_rt_build_flow_key(&fl4, sk, skb); |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 771 | __ip_do_redirect(rt, skb, &fl4, true); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 772 | } |
| 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
| 775 | { |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 776 | struct rtable *rt = (struct rtable *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | struct dst_entry *ret = dst; |
| 778 | |
| 779 | if (rt) { |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 780 | if (dst->obsolete > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | ip_rt_put(rt); |
| 782 | ret = NULL; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 783 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
| 784 | rt->dst.expires) { |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 785 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | ret = NULL; |
| 787 | } |
| 788 | } |
| 789 | return ret; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Algorithm: |
| 794 | * 1. The first ip_rt_redirect_number redirects are sent |
| 795 | * with exponential backoff, then we stop sending them at all, |
| 796 | * assuming that the host ignores our redirects. |
| 797 | * 2. If we did not see packets requiring redirects |
| 798 | * during ip_rt_redirect_silence, we assume that the host |
| 799 | * forgot redirected route and start to send redirects again. |
| 800 | * |
| 801 | * This algorithm is much cheaper and more intelligent than dumb load limiting |
| 802 | * in icmp.c. |
| 803 | * |
| 804 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) |
| 805 | * and "frag. need" (breaks PMTU discovery) in icmp.c. |
| 806 | */ |
| 807 | |
| 808 | void ip_rt_send_redirect(struct sk_buff *skb) |
| 809 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 810 | struct rtable *rt = skb_rtable(skb); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 811 | struct in_device *in_dev; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 812 | struct inet_peer *peer; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 813 | struct net *net; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 814 | int log_martians; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 816 | rcu_read_lock(); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 817 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 818 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
| 819 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | return; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 821 | } |
| 822 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); |
| 823 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 825 | net = dev_net(rt->dst.dev); |
| 826 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 827 | if (!peer) { |
| 828 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
| 829 | return; |
| 830 | } |
| 831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | /* No redirected packets during ip_rt_redirect_silence; |
| 833 | * reset the algorithm. |
| 834 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 835 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
| 836 | peer->rate_tokens = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | /* Too many ignored redirects; do not send anything |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 839 | * set dst.rate_last to the last seen redirected packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 841 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
| 842 | peer->rate_last = jiffies; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 843 | goto out_put_peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | /* Check for load limit; set rate_last to the latest sent |
| 847 | * redirect. |
| 848 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 849 | if (peer->rate_tokens == 0 || |
Li Yewang | 14fb8a7 | 2006-12-18 00:26:35 -0800 | [diff] [blame] | 850 | time_after(jiffies, |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 851 | (peer->rate_last + |
| 852 | (ip_rt_redirect_load << peer->rate_tokens)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, rt->rt_gateway); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 854 | peer->rate_last = jiffies; |
| 855 | ++peer->rate_tokens; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 857 | if (log_martians && |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 858 | peer->rate_tokens == ip_rt_redirect_number) |
| 859 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", |
David S. Miller | 92101b3 | 2012-07-23 16:29:00 -0700 | [diff] [blame] | 860 | &ip_hdr(skb)->saddr, inet_iif(skb), |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 861 | &ip_hdr(skb)->daddr, &rt->rt_gateway); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | #endif |
| 863 | } |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 864 | out_put_peer: |
| 865 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | static int ip_error(struct sk_buff *skb) |
| 869 | { |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 870 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 871 | struct rtable *rt = skb_rtable(skb); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 872 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | unsigned long now; |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 874 | struct net *net; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 875 | bool send; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | int code; |
| 877 | |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 878 | net = dev_net(rt->dst.dev); |
| 879 | if (!IN_DEV_FORWARD(in_dev)) { |
| 880 | switch (rt->dst.error) { |
| 881 | case EHOSTUNREACH: |
| 882 | IP_INC_STATS_BH(net, IPSTATS_MIB_INADDRERRORS); |
| 883 | break; |
| 884 | |
| 885 | case ENETUNREACH: |
| 886 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
| 887 | break; |
| 888 | } |
| 889 | goto out; |
| 890 | } |
| 891 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 892 | switch (rt->dst.error) { |
Joe Perches | 4500ebf | 2011-07-01 09:43:07 +0000 | [diff] [blame] | 893 | case EINVAL: |
| 894 | default: |
| 895 | goto out; |
| 896 | case EHOSTUNREACH: |
| 897 | code = ICMP_HOST_UNREACH; |
| 898 | break; |
| 899 | case ENETUNREACH: |
| 900 | code = ICMP_NET_UNREACH; |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 901 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
Joe Perches | 4500ebf | 2011-07-01 09:43:07 +0000 | [diff] [blame] | 902 | break; |
| 903 | case EACCES: |
| 904 | code = ICMP_PKT_FILTERED; |
| 905 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
| 907 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 908 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, 1); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 909 | |
| 910 | send = true; |
| 911 | if (peer) { |
| 912 | now = jiffies; |
| 913 | peer->rate_tokens += now - peer->rate_last; |
| 914 | if (peer->rate_tokens > ip_rt_error_burst) |
| 915 | peer->rate_tokens = ip_rt_error_burst; |
| 916 | peer->rate_last = now; |
| 917 | if (peer->rate_tokens >= ip_rt_error_cost) |
| 918 | peer->rate_tokens -= ip_rt_error_cost; |
| 919 | else |
| 920 | send = false; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 921 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 923 | if (send) |
| 924 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | out: kfree_skb(skb); |
| 927 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 928 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 930 | static u32 __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 932 | struct fib_result res; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 933 | |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 934 | if (mtu < ip_rt_min_pmtu) |
| 935 | mtu = ip_rt_min_pmtu; |
Eric Dumazet | fe6fe79 | 2011-06-08 06:07:07 +0000 | [diff] [blame] | 936 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 937 | if (fib_lookup(dev_net(rt->dst.dev), fl4, &res) == 0) { |
| 938 | struct fib_nh *nh = &FIB_RES_NH(res); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 939 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 940 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, |
| 941 | jiffies + ip_rt_mtu_expires); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 942 | } |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 943 | return mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 946 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 947 | struct sk_buff *skb, u32 mtu) |
| 948 | { |
| 949 | struct rtable *rt = (struct rtable *) dst; |
| 950 | struct flowi4 fl4; |
| 951 | |
| 952 | ip_rt_build_flow_key(&fl4, sk, skb); |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 953 | mtu = __ip_rt_update_pmtu(rt, &fl4, mtu); |
| 954 | |
| 955 | if (!rt->rt_pmtu) { |
| 956 | dst->obsolete = DST_OBSOLETE_KILL; |
| 957 | } else { |
| 958 | rt->rt_pmtu = mtu; |
| 959 | dst_set_expires(&rt->dst, ip_rt_mtu_expires); |
| 960 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 961 | } |
| 962 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 963 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
| 964 | int oif, u32 mark, u8 protocol, int flow_flags) |
| 965 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 966 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 967 | struct flowi4 fl4; |
| 968 | struct rtable *rt; |
| 969 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 970 | __build_flow_key(&fl4, NULL, iph, oif, |
| 971 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 972 | rt = __ip_route_output_key(net, &fl4); |
| 973 | if (!IS_ERR(rt)) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 974 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 975 | ip_rt_put(rt); |
| 976 | } |
| 977 | } |
| 978 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); |
| 979 | |
| 980 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
| 981 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 982 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 983 | struct flowi4 fl4; |
| 984 | struct rtable *rt; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 985 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 986 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
| 987 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
| 988 | if (!IS_ERR(rt)) { |
| 989 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
| 990 | ip_rt_put(rt); |
| 991 | } |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 992 | } |
| 993 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 994 | |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 995 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
| 996 | int oif, u32 mark, u8 protocol, int flow_flags) |
| 997 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 998 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 999 | struct flowi4 fl4; |
| 1000 | struct rtable *rt; |
| 1001 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1002 | __build_flow_key(&fl4, NULL, iph, oif, |
| 1003 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1004 | rt = __ip_route_output_key(net, &fl4); |
| 1005 | if (!IS_ERR(rt)) { |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1006 | __ip_do_redirect(rt, skb, &fl4, false); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1007 | ip_rt_put(rt); |
| 1008 | } |
| 1009 | } |
| 1010 | EXPORT_SYMBOL_GPL(ipv4_redirect); |
| 1011 | |
| 1012 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) |
| 1013 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1014 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1015 | struct flowi4 fl4; |
| 1016 | struct rtable *rt; |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1017 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1018 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
| 1019 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
| 1020 | if (!IS_ERR(rt)) { |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1021 | __ip_do_redirect(rt, skb, &fl4, false); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1022 | ip_rt_put(rt); |
| 1023 | } |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1024 | } |
| 1025 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); |
| 1026 | |
David S. Miller | efbc368 | 2011-12-01 13:38:59 -0500 | [diff] [blame] | 1027 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
| 1028 | { |
| 1029 | struct rtable *rt = (struct rtable *) dst; |
| 1030 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1031 | /* All IPV4 dsts are created with ->obsolete set to the value |
| 1032 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down |
| 1033 | * into this function always. |
| 1034 | * |
| 1035 | * When a PMTU/redirect information update invalidates a |
| 1036 | * route, this is indicated by setting obsolete to |
| 1037 | * DST_OBSOLETE_KILL. |
| 1038 | */ |
| 1039 | if (dst->obsolete == DST_OBSOLETE_KILL || rt_is_expired(rt)) |
David S. Miller | efbc368 | 2011-12-01 13:38:59 -0500 | [diff] [blame] | 1040 | return NULL; |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 1041 | return dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | } |
| 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | static void ipv4_link_failure(struct sk_buff *skb) |
| 1045 | { |
| 1046 | struct rtable *rt; |
| 1047 | |
| 1048 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| 1049 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1050 | rt = skb_rtable(skb); |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1051 | if (rt) |
| 1052 | dst_set_expires(&rt->dst, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | static int ip_rt_bug(struct sk_buff *skb) |
| 1056 | { |
Joe Perches | 91df42b | 2012-05-15 14:11:54 +0000 | [diff] [blame] | 1057 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
| 1058 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, |
| 1059 | skb->dev ? skb->dev->name : "?"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | kfree_skb(skb); |
Dave Jones | c378a9c | 2011-05-21 07:16:42 +0000 | [diff] [blame] | 1061 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | return 0; |
| 1063 | } |
| 1064 | |
| 1065 | /* |
| 1066 | We do not cache source address of outgoing interface, |
| 1067 | because it is used only by IP RR, TS and SRR options, |
| 1068 | so that it out of fast path. |
| 1069 | |
| 1070 | BTW remember: "addr" is allowed to be not aligned |
| 1071 | in IP options! |
| 1072 | */ |
| 1073 | |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1074 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1076 | __be32 src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1078 | if (rt_is_output_route(rt)) |
David S. Miller | c5be24f | 2011-05-13 18:01:21 -0400 | [diff] [blame] | 1079 | src = ip_hdr(skb)->saddr; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1080 | else { |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1081 | struct fib_result res; |
| 1082 | struct flowi4 fl4; |
| 1083 | struct iphdr *iph; |
| 1084 | |
| 1085 | iph = ip_hdr(skb); |
| 1086 | |
| 1087 | memset(&fl4, 0, sizeof(fl4)); |
| 1088 | fl4.daddr = iph->daddr; |
| 1089 | fl4.saddr = iph->saddr; |
Julian Anastasov | b0fe4a3 | 2011-07-23 02:00:41 +0000 | [diff] [blame] | 1090 | fl4.flowi4_tos = RT_TOS(iph->tos); |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1091 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
| 1092 | fl4.flowi4_iif = skb->dev->ifindex; |
| 1093 | fl4.flowi4_mark = skb->mark; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1094 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1095 | rcu_read_lock(); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1096 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 1097 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1098 | else |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1099 | src = inet_select_addr(rt->dst.dev, |
| 1100 | rt_nexthop(rt, iph->daddr), |
| 1101 | RT_SCOPE_UNIVERSE); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1102 | rcu_read_unlock(); |
| 1103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | memcpy(addr, &src, 4); |
| 1105 | } |
| 1106 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1107 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | static void set_class_tag(struct rtable *rt, u32 tag) |
| 1109 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1110 | if (!(rt->dst.tclassid & 0xFFFF)) |
| 1111 | rt->dst.tclassid |= tag & 0xFFFF; |
| 1112 | if (!(rt->dst.tclassid & 0xFFFF0000)) |
| 1113 | rt->dst.tclassid |= tag & 0xFFFF0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |
| 1115 | #endif |
| 1116 | |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1117 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
| 1118 | { |
| 1119 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); |
| 1120 | |
| 1121 | if (advmss == 0) { |
| 1122 | advmss = max_t(unsigned int, dst->dev->mtu - 40, |
| 1123 | ip_rt_min_advmss); |
| 1124 | if (advmss > 65535 - 40) |
| 1125 | advmss = 65535 - 40; |
| 1126 | } |
| 1127 | return advmss; |
| 1128 | } |
| 1129 | |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 1130 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1131 | { |
Steffen Klassert | 261663b | 2011-11-23 02:14:50 +0000 | [diff] [blame] | 1132 | const struct rtable *rt = (const struct rtable *) dst; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1133 | unsigned int mtu = rt->rt_pmtu; |
| 1134 | |
| 1135 | if (mtu && time_after_eq(jiffies, rt->dst.expires)) |
| 1136 | mtu = 0; |
| 1137 | |
| 1138 | if (!mtu) |
| 1139 | mtu = dst_metric_raw(dst, RTAX_MTU); |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 1140 | |
Steffen Klassert | 261663b | 2011-11-23 02:14:50 +0000 | [diff] [blame] | 1141 | if (mtu && rt_is_output_route(rt)) |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 1142 | return mtu; |
| 1143 | |
| 1144 | mtu = dst->dev->mtu; |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1145 | |
| 1146 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1147 | if (rt->rt_gateway && mtu > 576) |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1148 | mtu = 576; |
| 1149 | } |
| 1150 | |
| 1151 | if (mtu > IP_MAX_MTU) |
| 1152 | mtu = IP_MAX_MTU; |
| 1153 | |
| 1154 | return mtu; |
| 1155 | } |
| 1156 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1157 | static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1158 | { |
| 1159 | struct fnhe_hash_bucket *hash = nh->nh_exceptions; |
| 1160 | struct fib_nh_exception *fnhe; |
| 1161 | u32 hval; |
| 1162 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1163 | if (!hash) |
| 1164 | return NULL; |
| 1165 | |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 1166 | hval = fnhe_hashfun(daddr); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1167 | |
| 1168 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; |
| 1169 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1170 | if (fnhe->fnhe_daddr == daddr) |
| 1171 | return fnhe; |
| 1172 | } |
| 1173 | return NULL; |
| 1174 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1175 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1176 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1177 | __be32 daddr) |
| 1178 | { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1179 | bool ret = false; |
| 1180 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1181 | spin_lock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 1182 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1183 | if (daddr == fnhe->fnhe_daddr) { |
| 1184 | struct rtable *orig; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1185 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1186 | if (fnhe->fnhe_pmtu) { |
| 1187 | unsigned long expires = fnhe->fnhe_expires; |
| 1188 | unsigned long diff = expires - jiffies; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1189 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1190 | if (time_before(jiffies, expires)) { |
| 1191 | rt->rt_pmtu = fnhe->fnhe_pmtu; |
| 1192 | dst_set_expires(&rt->dst, diff); |
| 1193 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1194 | } |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1195 | if (fnhe->fnhe_gw) { |
| 1196 | rt->rt_flags |= RTCF_REDIRECTED; |
| 1197 | rt->rt_gateway = fnhe->fnhe_gw; |
| 1198 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1199 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1200 | orig = rcu_dereference(fnhe->fnhe_rth); |
| 1201 | rcu_assign_pointer(fnhe->fnhe_rth, rt); |
| 1202 | if (orig) |
| 1203 | rt_free(orig); |
| 1204 | |
| 1205 | fnhe->fnhe_stamp = jiffies; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1206 | ret = true; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1207 | } else { |
| 1208 | /* Routes we intend to cache in nexthop exception have |
| 1209 | * the DST_NOCACHE bit clear. However, if we are |
| 1210 | * unsuccessful at storing this route into the cache |
| 1211 | * we really need to set it. |
| 1212 | */ |
| 1213 | rt->dst.flags |= DST_NOCACHE; |
| 1214 | } |
| 1215 | spin_unlock_bh(&fnhe_lock); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1216 | |
| 1217 | return ret; |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1218 | } |
| 1219 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1220 | static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt) |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1221 | { |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1222 | struct rtable *orig, *prev, **p; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1223 | bool ret = true; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1224 | |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1225 | if (rt_is_input_route(rt)) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1226 | p = (struct rtable **)&nh->nh_rth_input; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1227 | } else { |
| 1228 | if (!nh->nh_pcpu_rth_output) |
| 1229 | goto nocache; |
| 1230 | p = (struct rtable **)__this_cpu_ptr(nh->nh_pcpu_rth_output); |
| 1231 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1232 | orig = *p; |
| 1233 | |
| 1234 | prev = cmpxchg(p, orig, rt); |
| 1235 | if (prev == orig) { |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1236 | if (orig) |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1237 | rt_free(orig); |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1238 | } else { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1239 | /* Routes we intend to cache in the FIB nexthop have |
| 1240 | * the DST_NOCACHE bit clear. However, if we are |
| 1241 | * unsuccessful at storing this route into the cache |
| 1242 | * we really need to set it. |
| 1243 | */ |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1244 | nocache: |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1245 | rt->dst.flags |= DST_NOCACHE; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1246 | ret = false; |
| 1247 | } |
| 1248 | |
| 1249 | return ret; |
| 1250 | } |
| 1251 | |
| 1252 | static DEFINE_SPINLOCK(rt_uncached_lock); |
| 1253 | static LIST_HEAD(rt_uncached_list); |
| 1254 | |
| 1255 | static void rt_add_uncached_list(struct rtable *rt) |
| 1256 | { |
| 1257 | spin_lock_bh(&rt_uncached_lock); |
| 1258 | list_add_tail(&rt->rt_uncached, &rt_uncached_list); |
| 1259 | spin_unlock_bh(&rt_uncached_lock); |
| 1260 | } |
| 1261 | |
| 1262 | static void ipv4_dst_destroy(struct dst_entry *dst) |
| 1263 | { |
| 1264 | struct rtable *rt = (struct rtable *) dst; |
| 1265 | |
| 1266 | if (dst->flags & DST_NOCACHE) { |
| 1267 | spin_lock_bh(&rt_uncached_lock); |
| 1268 | list_del(&rt->rt_uncached); |
| 1269 | spin_unlock_bh(&rt_uncached_lock); |
| 1270 | } |
| 1271 | } |
| 1272 | |
| 1273 | void rt_flush_dev(struct net_device *dev) |
| 1274 | { |
| 1275 | if (!list_empty(&rt_uncached_list)) { |
| 1276 | struct net *net = dev_net(dev); |
| 1277 | struct rtable *rt; |
| 1278 | |
| 1279 | spin_lock_bh(&rt_uncached_lock); |
| 1280 | list_for_each_entry(rt, &rt_uncached_list, rt_uncached) { |
| 1281 | if (rt->dst.dev != dev) |
| 1282 | continue; |
| 1283 | rt->dst.dev = net->loopback_dev; |
| 1284 | dev_hold(rt->dst.dev); |
| 1285 | dev_put(dev); |
| 1286 | } |
| 1287 | spin_unlock_bh(&rt_uncached_lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1288 | } |
| 1289 | } |
| 1290 | |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 1291 | static bool rt_cache_valid(const struct rtable *rt) |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1292 | { |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 1293 | return rt && |
| 1294 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && |
| 1295 | !rt_is_expired(rt); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1296 | } |
| 1297 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1298 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1299 | const struct fib_result *res, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1300 | struct fib_nh_exception *fnhe, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1301 | struct fib_info *fi, u16 type, u32 itag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1303 | bool cached = false; |
| 1304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | if (fi) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1306 | struct fib_nh *nh = &FIB_RES_NH(*res); |
| 1307 | |
| 1308 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) |
| 1309 | rt->rt_gateway = nh->nh_gw; |
David S. Miller | 2860583 | 2012-07-17 14:55:59 -0700 | [diff] [blame] | 1310 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1311 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1312 | rt->dst.tclassid = nh->nh_tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | #endif |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1314 | if (unlikely(fnhe)) |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1315 | cached = rt_bind_exception(rt, fnhe, daddr); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1316 | else if (!(rt->dst.flags & DST_NOCACHE)) |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1317 | cached = rt_cache_route(nh, rt); |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1318 | } |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1319 | if (unlikely(!cached)) |
| 1320 | rt_add_uncached_list(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1322 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 1324 | set_class_tag(rt, res->tclassid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | #endif |
| 1326 | set_class_tag(rt, itag); |
| 1327 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | } |
| 1329 | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1330 | static struct rtable *rt_dst_alloc(struct net_device *dev, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1331 | bool nopolicy, bool noxfrm, bool will_cache) |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1332 | { |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 1333 | return dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1334 | (will_cache ? 0 : (DST_HOST | DST_NOCACHE)) | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1335 | (nopolicy ? DST_NOPOLICY : 0) | |
| 1336 | (noxfrm ? DST_NOXFRM : 0)); |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1337 | } |
| 1338 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1339 | /* called in rcu_read_lock() section */ |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1340 | 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] | 1341 | u8 tos, struct net_device *dev, int our) |
| 1342 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | struct rtable *rth; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1344 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | u32 itag = 0; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1346 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | |
| 1348 | /* Primary sanity checks. */ |
| 1349 | |
| 1350 | if (in_dev == NULL) |
| 1351 | return -EINVAL; |
| 1352 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1353 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1354 | skb->protocol != htons(ETH_P_IP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | goto e_inval; |
| 1356 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1357 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
| 1358 | if (ipv4_is_loopback(saddr)) |
| 1359 | goto e_inval; |
| 1360 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1361 | if (ipv4_is_zeronet(saddr)) { |
| 1362 | if (!ipv4_is_local_multicast(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | goto e_inval; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1364 | } else { |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1365 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
| 1366 | in_dev, &itag); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1367 | if (err < 0) |
| 1368 | goto e_err; |
| 1369 | } |
Benjamin LaHaise | 4e7b2f1 | 2012-03-27 15:55:32 +0000 | [diff] [blame] | 1370 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1371 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | if (!rth) |
| 1373 | goto e_nobufs; |
| 1374 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1375 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1376 | rth->dst.tclassid = itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | #endif |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1378 | rth->dst.output = ip_rt_bug; |
| 1379 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1380 | rth->rt_genid = rt_genid(dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | rth->rt_flags = RTCF_MULTICAST; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1382 | rth->rt_type = RTN_MULTICAST; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1383 | rth->rt_is_input= 1; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1384 | rth->rt_iif = 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1385 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1386 | rth->rt_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1387 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | if (our) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1389 | rth->dst.input= ip_local_deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | rth->rt_flags |= RTCF_LOCAL; |
| 1391 | } |
| 1392 | |
| 1393 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1394 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1395 | rth->dst.input = ip_mr_input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | #endif |
| 1397 | RT_CACHE_STAT_INC(in_slow_mc); |
| 1398 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1399 | skb_dst_set(skb, &rth->dst); |
| 1400 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
| 1402 | e_nobufs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | e_inval: |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1405 | return -EINVAL; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1406 | e_err: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1407 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | } |
| 1409 | |
| 1410 | |
| 1411 | static void ip_handle_martian_source(struct net_device *dev, |
| 1412 | struct in_device *in_dev, |
| 1413 | struct sk_buff *skb, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1414 | __be32 daddr, |
| 1415 | __be32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | { |
| 1417 | RT_CACHE_STAT_INC(in_martian_src); |
| 1418 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1419 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { |
| 1420 | /* |
| 1421 | * RFC1812 recommendation, if source is martian, |
| 1422 | * the only hint is MAC header. |
| 1423 | */ |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1424 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1425 | &daddr, &saddr, dev->name); |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1426 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1427 | print_hex_dump(KERN_WARNING, "ll header: ", |
| 1428 | DUMP_PREFIX_OFFSET, 16, 1, |
| 1429 | skb_mac_header(skb), |
| 1430 | dev->hard_header_len, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | } |
| 1432 | } |
| 1433 | #endif |
| 1434 | } |
| 1435 | |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1436 | /* called in rcu_read_lock() section */ |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1437 | static int __mkroute_input(struct sk_buff *skb, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1438 | const struct fib_result *res, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1439 | struct in_device *in_dev, |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1440 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | struct rtable *rth; |
| 1443 | int err; |
| 1444 | struct in_device *out_dev; |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1445 | unsigned int flags = 0; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1446 | bool do_cache; |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 1447 | u32 itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | |
| 1449 | /* get a working reference to the output device */ |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1450 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | if (out_dev == NULL) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1452 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | return -EINVAL; |
| 1454 | } |
| 1455 | |
| 1456 | |
Michael Smith | 5c04c81 | 2011-04-07 04:51:50 +0000 | [diff] [blame] | 1457 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1458 | in_dev->dev, in_dev, &itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | if (err < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1460 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | saddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | goto cleanup; |
| 1464 | } |
| 1465 | |
Thomas Graf | 51b77ca | 2008-06-03 16:36:01 -0700 | [diff] [blame] | 1466 | if (out_dev == in_dev && err && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | (IN_DEV_SHARED_MEDIA(out_dev) || |
| 1468 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
| 1469 | flags |= RTCF_DOREDIRECT; |
| 1470 | |
| 1471 | if (skb->protocol != htons(ETH_P_IP)) { |
| 1472 | /* Not IP (i.e. ARP). Do not create route, if it is |
| 1473 | * invalid for proxy arp. DNAT routes are always valid. |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 1474 | * |
| 1475 | * Proxy arp feature have been extended to allow, ARP |
| 1476 | * replies back to the same interface, to support |
| 1477 | * Private VLAN switch technologies. See arp.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | */ |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 1479 | if (out_dev == in_dev && |
| 1480 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | err = -EINVAL; |
| 1482 | goto cleanup; |
| 1483 | } |
| 1484 | } |
| 1485 | |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1486 | do_cache = false; |
| 1487 | if (res->fi) { |
David S. Miller | fe3edf4 | 2012-07-23 13:22:20 -0700 | [diff] [blame] | 1488 | if (!itag) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1489 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1490 | if (rt_cache_valid(rth)) { |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1491 | skb_dst_set_noref(skb, &rth->dst); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1492 | goto out; |
| 1493 | } |
| 1494 | do_cache = true; |
| 1495 | } |
| 1496 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1497 | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1498 | rth = rt_dst_alloc(out_dev->dev, |
| 1499 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1500 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | if (!rth) { |
| 1502 | err = -ENOBUFS; |
| 1503 | goto cleanup; |
| 1504 | } |
| 1505 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1506 | rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); |
| 1507 | rth->rt_flags = flags; |
| 1508 | rth->rt_type = res->type; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1509 | rth->rt_is_input = 1; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1510 | rth->rt_iif = 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1511 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1512 | rth->rt_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1513 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1515 | rth->dst.input = ip_forward; |
| 1516 | rth->dst.output = ip_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1518 | rt_set_nexthop(rth, daddr, res, NULL, res->fi, res->type, itag); |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1519 | skb_dst_set(skb, &rth->dst); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1520 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | err = 0; |
| 1522 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | return err; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1526 | static int ip_mkroute_input(struct sk_buff *skb, |
| 1527 | struct fib_result *res, |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1528 | const struct flowi4 *fl4, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1529 | struct in_device *in_dev, |
| 1530 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | ff3fccb | 2011-03-10 16:23:24 -0800 | [diff] [blame] | 1533 | if (res->fi && res->fi->fib_nhs > 1) |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 1534 | fib_select_multipath(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | #endif |
| 1536 | |
| 1537 | /* create a routing cache entry */ |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1538 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | } |
| 1540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | /* |
| 1542 | * NOTE. We drop all the packets that has local source |
| 1543 | * addresses, because every properly looped back packet |
| 1544 | * must have correct destination already attached by output routine. |
| 1545 | * |
| 1546 | * Such approach solves two big problems: |
| 1547 | * 1. Not simplex devices are handled properly. |
| 1548 | * 2. IP spoofing attempts are filtered with 100% of guarantee. |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1549 | * called with rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | */ |
| 1551 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1552 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
David S. Miller | c10237e | 2012-06-27 17:05:06 -0700 | [diff] [blame] | 1553 | u8 tos, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | { |
| 1555 | struct fib_result res; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1556 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1557 | struct flowi4 fl4; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1558 | unsigned int flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | u32 itag = 0; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1560 | struct rtable *rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | int err = -EINVAL; |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 1562 | struct net *net = dev_net(dev); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1563 | bool do_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | |
| 1565 | /* IP on this device is disabled. */ |
| 1566 | |
| 1567 | if (!in_dev) |
| 1568 | goto out; |
| 1569 | |
| 1570 | /* Check for the most weird martians, which can be not detected |
| 1571 | by fib_lookup. |
| 1572 | */ |
| 1573 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1574 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | goto martian_source; |
| 1576 | |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1577 | res.fi = NULL; |
Andy Walls | 27a954b | 2010-10-17 15:11:22 +0000 | [diff] [blame] | 1578 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | goto brd_input; |
| 1580 | |
| 1581 | /* Accept zero addresses only to limited broadcast; |
| 1582 | * I even do not know to fix it or not. Waiting for complains :-) |
| 1583 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1584 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | goto martian_source; |
| 1586 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1587 | if (ipv4_is_zeronet(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | goto martian_destination; |
| 1589 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1590 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) { |
| 1591 | if (ipv4_is_loopback(daddr)) |
| 1592 | goto martian_destination; |
| 1593 | |
| 1594 | if (ipv4_is_loopback(saddr)) |
| 1595 | goto martian_source; |
| 1596 | } |
| 1597 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | /* |
| 1599 | * Now we are ready to route packet. |
| 1600 | */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1601 | fl4.flowi4_oif = 0; |
| 1602 | fl4.flowi4_iif = dev->ifindex; |
| 1603 | fl4.flowi4_mark = skb->mark; |
| 1604 | fl4.flowi4_tos = tos; |
| 1605 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
| 1606 | fl4.daddr = daddr; |
| 1607 | fl4.saddr = saddr; |
| 1608 | err = fib_lookup(net, &fl4, &res); |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 1609 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | goto no_route; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | |
| 1612 | RT_CACHE_STAT_INC(in_slow_tot); |
| 1613 | |
| 1614 | if (res.type == RTN_BROADCAST) |
| 1615 | goto brd_input; |
| 1616 | |
| 1617 | if (res.type == RTN_LOCAL) { |
Michael Smith | 5c04c81 | 2011-04-07 04:51:50 +0000 | [diff] [blame] | 1618 | err = fib_validate_source(skb, saddr, daddr, tos, |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1619 | net->loopback_dev->ifindex, |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1620 | dev, in_dev, &itag); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1621 | if (err < 0) |
| 1622 | goto martian_source_keep_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | goto local_input; |
| 1624 | } |
| 1625 | |
| 1626 | if (!IN_DEV_FORWARD(in_dev)) |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 1627 | goto no_route; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | if (res.type != RTN_UNICAST) |
| 1629 | goto martian_destination; |
| 1630 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1631 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | out: return err; |
| 1633 | |
| 1634 | brd_input: |
| 1635 | if (skb->protocol != htons(ETH_P_IP)) |
| 1636 | goto e_inval; |
| 1637 | |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 1638 | if (!ipv4_is_zeronet(saddr)) { |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1639 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
| 1640 | in_dev, &itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | if (err < 0) |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1642 | goto martian_source_keep_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | } |
| 1644 | flags |= RTCF_BROADCAST; |
| 1645 | res.type = RTN_BROADCAST; |
| 1646 | RT_CACHE_STAT_INC(in_brd); |
| 1647 | |
| 1648 | local_input: |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1649 | do_cache = false; |
| 1650 | if (res.fi) { |
David S. Miller | fe3edf4 | 2012-07-23 13:22:20 -0700 | [diff] [blame] | 1651 | if (!itag) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1652 | rth = rcu_dereference(FIB_RES_NH(res).nh_rth_input); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1653 | if (rt_cache_valid(rth)) { |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1654 | skb_dst_set_noref(skb, &rth->dst); |
| 1655 | err = 0; |
| 1656 | goto out; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1657 | } |
| 1658 | do_cache = true; |
| 1659 | } |
| 1660 | } |
| 1661 | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1662 | rth = rt_dst_alloc(net->loopback_dev, |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1663 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | if (!rth) |
| 1665 | goto e_nobufs; |
| 1666 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1667 | rth->dst.input= ip_local_deliver; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1668 | rth->dst.output= ip_rt_bug; |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1669 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 1670 | rth->dst.tclassid = itag; |
| 1671 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1673 | rth->rt_genid = rt_genid(net); |
| 1674 | rth->rt_flags = flags|RTCF_LOCAL; |
| 1675 | rth->rt_type = res.type; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1676 | rth->rt_is_input = 1; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1677 | rth->rt_iif = 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1678 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1679 | rth->rt_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1680 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | if (res.type == RTN_UNREACHABLE) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1682 | rth->dst.input= ip_error; |
| 1683 | rth->dst.error= -err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | rth->rt_flags &= ~RTCF_LOCAL; |
| 1685 | } |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1686 | if (do_cache) |
| 1687 | rt_cache_route(&FIB_RES_NH(res), rth); |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1688 | skb_dst_set(skb, &rth->dst); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1689 | err = 0; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1690 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | |
| 1692 | no_route: |
| 1693 | RT_CACHE_STAT_INC(in_no_route); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | res.type = RTN_UNREACHABLE; |
Mitsuru Chinen | 7f53878 | 2007-12-07 01:07:24 -0800 | [diff] [blame] | 1695 | if (err == -ESRCH) |
| 1696 | err = -ENETUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | goto local_input; |
| 1698 | |
| 1699 | /* |
| 1700 | * Do not cache martian addresses: they should be logged (RFC1812) |
| 1701 | */ |
| 1702 | martian_destination: |
| 1703 | RT_CACHE_STAT_INC(in_martian_dst); |
| 1704 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1705 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
| 1706 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", |
| 1707 | &daddr, &saddr, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | #endif |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 1709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | e_inval: |
| 1711 | err = -EINVAL; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1712 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
| 1714 | e_nobufs: |
| 1715 | err = -ENOBUFS; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1716 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
| 1718 | martian_source: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1719 | err = -EINVAL; |
| 1720 | martian_source_keep_err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1722 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | } |
| 1724 | |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1725 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
| 1726 | u8 tos, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1728 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1730 | rcu_read_lock(); |
| 1731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | /* Multicast recognition logic is moved from route cache to here. |
| 1733 | The problem was that too many Ethernet cards have broken/missing |
| 1734 | hardware multicast filters :-( As result the host on multicasting |
| 1735 | network acquires a lot of useless route cache entries, sort of |
| 1736 | SDR messages from all the world. Now we try to get rid of them. |
| 1737 | Really, provided software IP multicast filter is organized |
| 1738 | reasonably (at least, hashed), it does not result in a slowdown |
| 1739 | comparing with route cache reject entries. |
| 1740 | Note, that multicast routers are not affected, because |
| 1741 | route cache entry is created eventually. |
| 1742 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1743 | if (ipv4_is_multicast(daddr)) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1744 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1746 | if (in_dev) { |
David S. Miller | dbdd9a5 | 2011-03-10 16:34:38 -0800 | [diff] [blame] | 1747 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
| 1748 | ip_hdr(skb)->protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | if (our |
| 1750 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 1751 | || |
| 1752 | (!ipv4_is_local_multicast(daddr) && |
| 1753 | IN_DEV_MFORWARD(in_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | #endif |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 1755 | ) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1756 | int res = ip_route_input_mc(skb, daddr, saddr, |
| 1757 | tos, dev, our); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | rcu_read_unlock(); |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1759 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | } |
| 1761 | } |
| 1762 | rcu_read_unlock(); |
| 1763 | return -EINVAL; |
| 1764 | } |
David S. Miller | c10237e | 2012-06-27 17:05:06 -0700 | [diff] [blame] | 1765 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1766 | rcu_read_unlock(); |
| 1767 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | } |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1769 | EXPORT_SYMBOL(ip_route_input_noref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1771 | /* called with rcu_read_lock() */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1772 | static struct rtable *__mkroute_output(const struct fib_result *res, |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 1773 | const struct flowi4 *fl4, int orig_oif, |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 1774 | struct net_device *dev_out, |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1775 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | { |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1777 | struct fib_info *fi = res->fi; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1778 | struct fib_nh_exception *fnhe; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1779 | struct in_device *in_dev; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1780 | u16 type = res->type; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1781 | struct rtable *rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1783 | in_dev = __in_dev_get_rcu(dev_out); |
| 1784 | if (!in_dev) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1785 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1787 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
| 1788 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) |
| 1789 | return ERR_PTR(-EINVAL); |
| 1790 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1791 | if (ipv4_is_lbcast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1792 | type = RTN_BROADCAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1793 | else if (ipv4_is_multicast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1794 | type = RTN_MULTICAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1795 | else if (ipv4_is_zeronet(fl4->daddr)) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1796 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | |
| 1798 | if (dev_out->flags & IFF_LOOPBACK) |
| 1799 | flags |= RTCF_LOCAL; |
| 1800 | |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1801 | if (type == RTN_BROADCAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1803 | fi = NULL; |
| 1804 | } else if (type == RTN_MULTICAST) { |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 1805 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1806 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
| 1807 | fl4->flowi4_proto)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | flags &= ~RTCF_LOCAL; |
| 1809 | /* If multicast route do not exist use |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 1810 | * default one, but do not gateway in this case. |
| 1811 | * Yes, it is hack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1813 | if (fi && res->prefixlen < 4) |
| 1814 | fi = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | } |
| 1816 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1817 | fnhe = NULL; |
| 1818 | if (fi) { |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1819 | struct rtable __rcu **prth; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1820 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1821 | fnhe = find_exception(&FIB_RES_NH(*res), fl4->daddr); |
| 1822 | if (fnhe) |
| 1823 | prth = &fnhe->fnhe_rth; |
| 1824 | else |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1825 | prth = __this_cpu_ptr(FIB_RES_NH(*res).nh_pcpu_rth_output); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1826 | rth = rcu_dereference(*prth); |
| 1827 | if (rt_cache_valid(rth)) { |
| 1828 | dst_hold(&rth->dst); |
| 1829 | return rth; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1830 | } |
| 1831 | } |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1832 | rth = rt_dst_alloc(dev_out, |
| 1833 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1834 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1835 | fi); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 1836 | if (!rth) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1837 | return ERR_PTR(-ENOBUFS); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 1838 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1839 | rth->dst.output = ip_output; |
| 1840 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1841 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
| 1842 | rth->rt_flags = flags; |
| 1843 | rth->rt_type = type; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1844 | rth->rt_is_input = 0; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1845 | rth->rt_iif = orig_oif ? : 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1846 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1847 | rth->rt_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1848 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | |
| 1850 | RT_CACHE_STAT_INC(out_slow_tot); |
| 1851 | |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 1852 | if (flags & RTCF_LOCAL) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1853 | rth->dst.input = ip_local_deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1855 | if (flags & RTCF_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | !(dev_out->flags & IFF_LOOPBACK)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1857 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | RT_CACHE_STAT_INC(out_slow_mc); |
| 1859 | } |
| 1860 | #ifdef CONFIG_IP_MROUTE |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1861 | if (type == RTN_MULTICAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | if (IN_DEV_MFORWARD(in_dev) && |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1863 | !ipv4_is_local_multicast(fl4->daddr)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1864 | rth->dst.input = ip_mr_input; |
| 1865 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | } |
| 1867 | } |
| 1868 | #endif |
| 1869 | } |
| 1870 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1871 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1873 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | } |
| 1875 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | /* |
| 1877 | * Major route resolver routine. |
| 1878 | */ |
| 1879 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1880 | struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | struct net_device *dev_out = NULL; |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 1883 | __u8 tos = RT_FL_TOS(fl4); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1884 | unsigned int flags = 0; |
| 1885 | struct fib_result res; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1886 | struct rtable *rth; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1887 | int orig_oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 1889 | res.tclassid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | res.fi = NULL; |
David S. Miller | 8b96d22 | 2012-06-11 02:01:56 -0700 | [diff] [blame] | 1891 | res.table = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1893 | orig_oif = fl4->flowi4_oif; |
| 1894 | |
| 1895 | fl4->flowi4_iif = net->loopback_dev->ifindex; |
| 1896 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
| 1897 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? |
| 1898 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); |
David S. Miller | 44713b6 | 2011-03-04 21:24:47 -0800 | [diff] [blame] | 1899 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 1900 | rcu_read_lock(); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1901 | if (fl4->saddr) { |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1902 | rth = ERR_PTR(-EINVAL); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1903 | if (ipv4_is_multicast(fl4->saddr) || |
| 1904 | ipv4_is_lbcast(fl4->saddr) || |
| 1905 | ipv4_is_zeronet(fl4->saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | goto out; |
| 1907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | /* I removed check for oif == dev_out->oif here. |
| 1909 | It was wrong for two reasons: |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 1910 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
| 1911 | is assigned to multiple interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | 2. Moreover, we are allowed to send packets with saddr |
| 1913 | of another iface. --ANK |
| 1914 | */ |
| 1915 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1916 | if (fl4->flowi4_oif == 0 && |
| 1917 | (ipv4_is_multicast(fl4->daddr) || |
| 1918 | ipv4_is_lbcast(fl4->daddr))) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1919 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1920 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1921 | if (dev_out == NULL) |
| 1922 | goto out; |
| 1923 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | /* Special hack: user can direct multicasts |
| 1925 | and limited broadcast via necessary interface |
| 1926 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. |
| 1927 | This hack is not just for fun, it allows |
| 1928 | vic,vat and friends to work. |
| 1929 | They bind socket to loopback, set ttl to zero |
| 1930 | and expect that it will work. |
| 1931 | From the viewpoint of routing cache they are broken, |
| 1932 | because we are not allowed to build multicast path |
| 1933 | with loopback source addr (look, routing cache |
| 1934 | cannot know, that ttl is zero, so that packet |
| 1935 | will not leave this host and route is valid). |
| 1936 | Luckily, this hack is good workaround. |
| 1937 | */ |
| 1938 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1939 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | goto make_route; |
| 1941 | } |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1942 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1943 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1944 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1945 | if (!__ip_dev_find(net, fl4->saddr, false)) |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1946 | goto out; |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1947 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | } |
| 1949 | |
| 1950 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1951 | if (fl4->flowi4_oif) { |
| 1952 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1953 | rth = ERR_PTR(-ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | if (dev_out == NULL) |
| 1955 | goto out; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 1956 | |
| 1957 | /* RACE: Check return value of inet_select_addr instead. */ |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 1958 | 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] | 1959 | rth = ERR_PTR(-ENETUNREACH); |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 1960 | goto out; |
| 1961 | } |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1962 | if (ipv4_is_local_multicast(fl4->daddr) || |
| 1963 | ipv4_is_lbcast(fl4->daddr)) { |
| 1964 | if (!fl4->saddr) |
| 1965 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 1966 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | goto make_route; |
| 1968 | } |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1969 | if (fl4->saddr) { |
| 1970 | if (ipv4_is_multicast(fl4->daddr)) |
| 1971 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 1972 | fl4->flowi4_scope); |
| 1973 | else if (!fl4->daddr) |
| 1974 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 1975 | RT_SCOPE_HOST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | } |
| 1977 | } |
| 1978 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1979 | if (!fl4->daddr) { |
| 1980 | fl4->daddr = fl4->saddr; |
| 1981 | if (!fl4->daddr) |
| 1982 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 1983 | dev_out = net->loopback_dev; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1984 | fl4->flowi4_oif = net->loopback_dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | res.type = RTN_LOCAL; |
| 1986 | flags |= RTCF_LOCAL; |
| 1987 | goto make_route; |
| 1988 | } |
| 1989 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1990 | if (fib_lookup(net, fl4, &res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | res.fi = NULL; |
David S. Miller | 8b96d22 | 2012-06-11 02:01:56 -0700 | [diff] [blame] | 1992 | res.table = NULL; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1993 | if (fl4->flowi4_oif) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | /* Apparently, routing tables are wrong. Assume, |
| 1995 | that the destination is on link. |
| 1996 | |
| 1997 | WHY? DW. |
| 1998 | Because we are allowed to send to iface |
| 1999 | even if it has NO routes and NO assigned |
| 2000 | addresses. When oif is specified, routing |
| 2001 | tables are looked up with only one purpose: |
| 2002 | to catch if destination is gatewayed, rather than |
| 2003 | direct. Moreover, if MSG_DONTROUTE is set, |
| 2004 | we send packet, ignoring both routing tables |
| 2005 | and ifaddr state. --ANK |
| 2006 | |
| 2007 | |
| 2008 | We could make it even if oif is unknown, |
| 2009 | likely IPv6, but we do not. |
| 2010 | */ |
| 2011 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2012 | if (fl4->saddr == 0) |
| 2013 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2014 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | res.type = RTN_UNICAST; |
| 2016 | goto make_route; |
| 2017 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2018 | rth = ERR_PTR(-ENETUNREACH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | goto out; |
| 2020 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | |
| 2022 | if (res.type == RTN_LOCAL) { |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2023 | if (!fl4->saddr) { |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2024 | if (res.fi->fib_prefsrc) |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2025 | fl4->saddr = res.fi->fib_prefsrc; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2026 | else |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2027 | fl4->saddr = fl4->daddr; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2028 | } |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2029 | dev_out = net->loopback_dev; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2030 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | flags |= RTCF_LOCAL; |
| 2032 | goto make_route; |
| 2033 | } |
| 2034 | |
| 2035 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2036 | if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 2037 | fib_select_multipath(&res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | else |
| 2039 | #endif |
David S. Miller | 21d8c49 | 2011-04-14 14:49:37 -0700 | [diff] [blame] | 2040 | if (!res.prefixlen && |
| 2041 | res.table->tb_num_default > 1 && |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2042 | res.type == RTN_UNICAST && !fl4->flowi4_oif) |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 2043 | fib_select_default(&res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2045 | if (!fl4->saddr) |
| 2046 | fl4->saddr = FIB_RES_PREFSRC(net, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | dev_out = FIB_RES_DEV(res); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2049 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
| 2051 | |
| 2052 | make_route: |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2053 | rth = __mkroute_output(&res, fl4, orig_oif, dev_out, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2055 | out: |
| 2056 | rcu_read_unlock(); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2057 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2059 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
| 2060 | |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2061 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
| 2062 | { |
| 2063 | return NULL; |
| 2064 | } |
| 2065 | |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 2066 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2067 | { |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 2068 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
| 2069 | |
| 2070 | return mtu ? : dst->dev->mtu; |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2071 | } |
| 2072 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 2073 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 2074 | struct sk_buff *skb, u32 mtu) |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2075 | { |
| 2076 | } |
| 2077 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 2078 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
| 2079 | struct sk_buff *skb) |
David S. Miller | b587ee3 | 2012-07-12 00:39:24 -0700 | [diff] [blame] | 2080 | { |
| 2081 | } |
| 2082 | |
Held Bernhard | 0972ddb | 2011-04-24 22:07:32 +0000 | [diff] [blame] | 2083 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
| 2084 | unsigned long old) |
| 2085 | { |
| 2086 | return NULL; |
| 2087 | } |
| 2088 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2089 | static struct dst_ops ipv4_dst_blackhole_ops = { |
| 2090 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 2091 | .protocol = cpu_to_be16(ETH_P_IP), |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2092 | .check = ipv4_blackhole_dst_check, |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 2093 | .mtu = ipv4_blackhole_mtu, |
Eric Dumazet | 214f45c | 2011-02-18 11:39:01 -0800 | [diff] [blame] | 2094 | .default_advmss = ipv4_default_advmss, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2095 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
David S. Miller | b587ee3 | 2012-07-12 00:39:24 -0700 | [diff] [blame] | 2096 | .redirect = ipv4_rt_blackhole_redirect, |
Held Bernhard | 0972ddb | 2011-04-24 22:07:32 +0000 | [diff] [blame] | 2097 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 2098 | .neigh_lookup = ipv4_neigh_lookup, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2099 | }; |
| 2100 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2101 | 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] | 2102 | { |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2103 | struct rtable *ort = (struct rtable *) dst_orig; |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 2104 | struct rtable *rt; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2105 | |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 2106 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE, 0); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2107 | if (rt) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2108 | struct dst_entry *new = &rt->dst; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2109 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2110 | new->__use = 1; |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 2111 | new->input = dst_discard; |
| 2112 | new->output = dst_discard; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2113 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2114 | new->dev = ort->dst.dev; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2115 | if (new->dev) |
| 2116 | dev_hold(new->dev); |
| 2117 | |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 2118 | rt->rt_is_input = ort->rt_is_input; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2119 | rt->rt_iif = ort->rt_iif; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 2120 | rt->rt_pmtu = ort->rt_pmtu; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2121 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2122 | rt->rt_genid = rt_genid(net); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2123 | rt->rt_flags = ort->rt_flags; |
| 2124 | rt->rt_type = ort->rt_type; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2125 | rt->rt_gateway = ort->rt_gateway; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2126 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 2127 | INIT_LIST_HEAD(&rt->rt_uncached); |
| 2128 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2129 | dst_free(new); |
| 2130 | } |
| 2131 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2132 | dst_release(dst_orig); |
| 2133 | |
| 2134 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2135 | } |
| 2136 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2137 | 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] | 2138 | struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2140 | struct rtable *rt = __ip_route_output_key(net, flp4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2142 | if (IS_ERR(rt)) |
| 2143 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | |
David S. Miller | 5615787 | 2011-05-02 14:37:45 -0700 | [diff] [blame] | 2145 | if (flp4->flowi4_proto) |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2146 | rt = (struct rtable *) xfrm_lookup(net, &rt->dst, |
| 2147 | flowi4_to_flowi(flp4), |
| 2148 | sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2150 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2152 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
| 2153 | |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2154 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
| 2155 | struct flowi4 *fl4, struct sk_buff *skb, u32 pid, |
| 2156 | u32 seq, int event, int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2158 | struct rtable *rt = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | struct rtmsg *r; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2160 | struct nlmsghdr *nlh; |
Steffen Klassert | 2bc8ca4 | 2011-10-11 01:12:02 +0000 | [diff] [blame] | 2161 | unsigned long expires = 0; |
David S. Miller | f185071 | 2012-07-10 07:26:01 -0700 | [diff] [blame] | 2162 | u32 error; |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2163 | u32 metrics[RTAX_MAX]; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2164 | |
| 2165 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); |
| 2166 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2167 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2168 | |
| 2169 | r = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | r->rtm_family = AF_INET; |
| 2171 | r->rtm_dst_len = 32; |
| 2172 | r->rtm_src_len = 0; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2173 | r->rtm_tos = fl4->flowi4_tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | r->rtm_table = RT_TABLE_MAIN; |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2175 | if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN)) |
| 2176 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | r->rtm_type = rt->rt_type; |
| 2178 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2179 | r->rtm_protocol = RTPROT_UNSPEC; |
| 2180 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 2181 | if (rt->rt_flags & RTCF_NOTIFY) |
| 2182 | r->rtm_flags |= RTM_F_NOTIFY; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2183 | |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2184 | if (nla_put_be32(skb, RTA_DST, dst)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2185 | goto nla_put_failure; |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2186 | if (src) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | r->rtm_src_len = 32; |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2188 | if (nla_put_be32(skb, RTA_SRC, src)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2189 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | } |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2191 | if (rt->dst.dev && |
| 2192 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
| 2193 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2194 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2195 | if (rt->dst.tclassid && |
| 2196 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) |
| 2197 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | #endif |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 2199 | if (!rt_is_input_route(rt) && |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2200 | fl4->saddr != src) { |
| 2201 | if (nla_put_be32(skb, RTA_PREFSRC, fl4->saddr)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2202 | goto nla_put_failure; |
| 2203 | } |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 2204 | if (rt->rt_gateway && |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2205 | nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway)) |
| 2206 | goto nla_put_failure; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2207 | |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2208 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
| 2209 | if (rt->rt_pmtu) |
| 2210 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
| 2211 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2212 | goto nla_put_failure; |
| 2213 | |
David Miller | b486988 | 2012-07-01 02:03:01 +0000 | [diff] [blame] | 2214 | if (fl4->flowi4_mark && |
| 2215 | nla_put_be32(skb, RTA_MARK, fl4->flowi4_mark)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2216 | goto nla_put_failure; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2217 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2218 | error = rt->dst.error; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 2219 | expires = rt->dst.expires; |
| 2220 | if (expires) { |
| 2221 | if (time_before(jiffies, expires)) |
| 2222 | expires -= jiffies; |
| 2223 | else |
| 2224 | expires = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | } |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2226 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 2227 | if (rt_is_input_route(rt)) { |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2228 | if (nla_put_u32(skb, RTA_IIF, rt->rt_iif)) |
| 2229 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | } |
| 2231 | |
David S. Miller | f185071 | 2012-07-10 07:26:01 -0700 | [diff] [blame] | 2232 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2233 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2235 | return nlmsg_end(skb, nlh); |
| 2236 | |
| 2237 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2238 | nlmsg_cancel(skb, nlh); |
| 2239 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | } |
| 2241 | |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 2242 | 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] | 2243 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2244 | struct net *net = sock_net(in_skb->sk); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2245 | struct rtmsg *rtm; |
| 2246 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | struct rtable *rt = NULL; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2248 | struct flowi4 fl4; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2249 | __be32 dst = 0; |
| 2250 | __be32 src = 0; |
| 2251 | u32 iif; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2252 | int err; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2253 | int mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | struct sk_buff *skb; |
| 2255 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2256 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
| 2257 | if (err < 0) |
| 2258 | goto errout; |
| 2259 | |
| 2260 | rtm = nlmsg_data(nlh); |
| 2261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2262 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2263 | if (skb == NULL) { |
| 2264 | err = -ENOBUFS; |
| 2265 | goto errout; |
| 2266 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | |
| 2268 | /* Reserve room for dummy headers, this skb can pass |
| 2269 | through good chunk of routing engine. |
| 2270 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 2271 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2272 | skb_reset_network_header(skb); |
Stephen Hemminger | d2c962b | 2006-04-17 17:27:11 -0700 | [diff] [blame] | 2273 | |
| 2274 | /* 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] | 2275 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
| 2277 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2278 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
| 2279 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2280 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2281 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2283 | memset(&fl4, 0, sizeof(fl4)); |
| 2284 | fl4.daddr = dst; |
| 2285 | fl4.saddr = src; |
| 2286 | fl4.flowi4_tos = rtm->rtm_tos; |
| 2287 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; |
| 2288 | fl4.flowi4_mark = mark; |
| 2289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | if (iif) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2291 | struct net_device *dev; |
| 2292 | |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2293 | dev = __dev_get_by_index(net, iif); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2294 | if (dev == NULL) { |
| 2295 | err = -ENODEV; |
| 2296 | goto errout_free; |
| 2297 | } |
| 2298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | skb->protocol = htons(ETH_P_IP); |
| 2300 | skb->dev = dev; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2301 | skb->mark = mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | local_bh_disable(); |
| 2303 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); |
| 2304 | local_bh_enable(); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2305 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2306 | rt = skb_rtable(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2307 | if (err == 0 && rt->dst.error) |
| 2308 | err = -rt->dst.error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | } else { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2310 | rt = ip_route_output_key(net, &fl4); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2311 | |
| 2312 | err = 0; |
| 2313 | if (IS_ERR(rt)) |
| 2314 | err = PTR_ERR(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | } |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | if (err) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2318 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2320 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 2322 | rt->rt_flags |= RTCF_NOTIFY; |
| 2323 | |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2324 | err = rt_fill_info(net, dst, src, &fl4, skb, |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2325 | NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2326 | RTM_NEWROUTE, 0, 0); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2327 | if (err <= 0) |
| 2328 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2330 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2331 | errout: |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2332 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2334 | errout_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | kfree_skb(skb); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2336 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | } |
| 2338 | |
| 2339 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 2340 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | return skb->len; |
| 2342 | } |
| 2343 | |
| 2344 | void ip_rt_multicast_event(struct in_device *in_dev) |
| 2345 | { |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 2346 | rt_cache_flush(dev_net(in_dev->dev), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | } |
| 2348 | |
| 2349 | #ifdef CONFIG_SYSCTL |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 2350 | static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2351 | void __user *buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | size_t *lenp, loff_t *ppos) |
| 2353 | { |
| 2354 | if (write) { |
Denis V. Lunev | 639e104 | 2008-07-05 19:02:06 -0700 | [diff] [blame] | 2355 | int flush_delay; |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 2356 | ctl_table ctl; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2357 | struct net *net; |
Denis V. Lunev | 639e104 | 2008-07-05 19:02:06 -0700 | [diff] [blame] | 2358 | |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 2359 | memcpy(&ctl, __ctl, sizeof(ctl)); |
| 2360 | ctl.data = &flush_delay; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2361 | proc_dointvec(&ctl, write, buffer, lenp, ppos); |
Denis V. Lunev | 639e104 | 2008-07-05 19:02:06 -0700 | [diff] [blame] | 2362 | |
Denis V. Lunev | 81c684d | 2008-07-08 03:05:28 -0700 | [diff] [blame] | 2363 | net = (struct net *)__ctl->extra1; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2364 | rt_cache_flush(net, flush_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2366 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | |
| 2368 | return -EINVAL; |
| 2369 | } |
| 2370 | |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 2371 | static ctl_table ipv4_route_table[] = { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2372 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | .procname = "gc_thresh", |
| 2374 | .data = &ipv4_dst_ops.gc_thresh, |
| 2375 | .maxlen = sizeof(int), |
| 2376 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2377 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | }, |
| 2379 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2380 | .procname = "max_size", |
| 2381 | .data = &ip_rt_max_size, |
| 2382 | .maxlen = sizeof(int), |
| 2383 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2384 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | }, |
| 2386 | { |
| 2387 | /* Deprecated. Use gc_min_interval_ms */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | .procname = "gc_min_interval", |
| 2390 | .data = &ip_rt_gc_min_interval, |
| 2391 | .maxlen = sizeof(int), |
| 2392 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2393 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | }, |
| 2395 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | .procname = "gc_min_interval_ms", |
| 2397 | .data = &ip_rt_gc_min_interval, |
| 2398 | .maxlen = sizeof(int), |
| 2399 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2400 | .proc_handler = proc_dointvec_ms_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2401 | }, |
| 2402 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | .procname = "gc_timeout", |
| 2404 | .data = &ip_rt_gc_timeout, |
| 2405 | .maxlen = sizeof(int), |
| 2406 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2407 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2408 | }, |
| 2409 | { |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 2410 | .procname = "gc_interval", |
| 2411 | .data = &ip_rt_gc_interval, |
| 2412 | .maxlen = sizeof(int), |
| 2413 | .mode = 0644, |
| 2414 | .proc_handler = proc_dointvec_jiffies, |
| 2415 | }, |
| 2416 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | .procname = "redirect_load", |
| 2418 | .data = &ip_rt_redirect_load, |
| 2419 | .maxlen = sizeof(int), |
| 2420 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2421 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | }, |
| 2423 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | .procname = "redirect_number", |
| 2425 | .data = &ip_rt_redirect_number, |
| 2426 | .maxlen = sizeof(int), |
| 2427 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2428 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | }, |
| 2430 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | .procname = "redirect_silence", |
| 2432 | .data = &ip_rt_redirect_silence, |
| 2433 | .maxlen = sizeof(int), |
| 2434 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2435 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | }, |
| 2437 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | .procname = "error_cost", |
| 2439 | .data = &ip_rt_error_cost, |
| 2440 | .maxlen = sizeof(int), |
| 2441 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2442 | .proc_handler = proc_dointvec, |
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 | .procname = "error_burst", |
| 2446 | .data = &ip_rt_error_burst, |
| 2447 | .maxlen = sizeof(int), |
| 2448 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2449 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | }, |
| 2451 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | .procname = "gc_elasticity", |
| 2453 | .data = &ip_rt_gc_elasticity, |
| 2454 | .maxlen = sizeof(int), |
| 2455 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2456 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | }, |
| 2458 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | .procname = "mtu_expires", |
| 2460 | .data = &ip_rt_mtu_expires, |
| 2461 | .maxlen = sizeof(int), |
| 2462 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2463 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | }, |
| 2465 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2466 | .procname = "min_pmtu", |
| 2467 | .data = &ip_rt_min_pmtu, |
| 2468 | .maxlen = sizeof(int), |
| 2469 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2470 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | }, |
| 2472 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | .procname = "min_adv_mss", |
| 2474 | .data = &ip_rt_min_advmss, |
| 2475 | .maxlen = sizeof(int), |
| 2476 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2477 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2479 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2480 | }; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2481 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2482 | static struct ctl_table ipv4_route_flush_table[] = { |
| 2483 | { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2484 | .procname = "flush", |
| 2485 | .maxlen = sizeof(int), |
| 2486 | .mode = 0200, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2487 | .proc_handler = ipv4_sysctl_rtcache_flush, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2488 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2489 | { }, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2490 | }; |
| 2491 | |
| 2492 | static __net_init int sysctl_route_net_init(struct net *net) |
| 2493 | { |
| 2494 | struct ctl_table *tbl; |
| 2495 | |
| 2496 | tbl = ipv4_route_flush_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2497 | if (!net_eq(net, &init_net)) { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2498 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
| 2499 | if (tbl == NULL) |
| 2500 | goto err_dup; |
| 2501 | } |
| 2502 | tbl[0].extra1 = net; |
| 2503 | |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 2504 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2505 | if (net->ipv4.route_hdr == NULL) |
| 2506 | goto err_reg; |
| 2507 | return 0; |
| 2508 | |
| 2509 | err_reg: |
| 2510 | if (tbl != ipv4_route_flush_table) |
| 2511 | kfree(tbl); |
| 2512 | err_dup: |
| 2513 | return -ENOMEM; |
| 2514 | } |
| 2515 | |
| 2516 | static __net_exit void sysctl_route_net_exit(struct net *net) |
| 2517 | { |
| 2518 | struct ctl_table *tbl; |
| 2519 | |
| 2520 | tbl = net->ipv4.route_hdr->ctl_table_arg; |
| 2521 | unregister_net_sysctl_table(net->ipv4.route_hdr); |
| 2522 | BUG_ON(tbl == ipv4_route_flush_table); |
| 2523 | kfree(tbl); |
| 2524 | } |
| 2525 | |
| 2526 | static __net_initdata struct pernet_operations sysctl_route_ops = { |
| 2527 | .init = sysctl_route_net_init, |
| 2528 | .exit = sysctl_route_net_exit, |
| 2529 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | #endif |
| 2531 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2532 | static __net_init int rt_genid_init(struct net *net) |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2533 | { |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2534 | get_random_bytes(&net->ipv4.rt_genid, |
| 2535 | sizeof(net->ipv4.rt_genid)); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 2536 | get_random_bytes(&net->ipv4.dev_addr_genid, |
| 2537 | sizeof(net->ipv4.dev_addr_genid)); |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2538 | return 0; |
| 2539 | } |
| 2540 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2541 | static __net_initdata struct pernet_operations rt_genid_ops = { |
| 2542 | .init = rt_genid_init, |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2543 | }; |
| 2544 | |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2545 | static int __net_init ipv4_inetpeer_init(struct net *net) |
| 2546 | { |
| 2547 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); |
| 2548 | |
| 2549 | if (!bp) |
| 2550 | return -ENOMEM; |
| 2551 | inet_peer_base_init(bp); |
| 2552 | net->ipv4.peers = bp; |
| 2553 | return 0; |
| 2554 | } |
| 2555 | |
| 2556 | static void __net_exit ipv4_inetpeer_exit(struct net *net) |
| 2557 | { |
| 2558 | struct inet_peer_base *bp = net->ipv4.peers; |
| 2559 | |
| 2560 | net->ipv4.peers = NULL; |
David S. Miller | 56a6b24 | 2012-06-09 16:32:41 -0700 | [diff] [blame] | 2561 | inetpeer_invalidate_tree(bp); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2562 | kfree(bp); |
| 2563 | } |
| 2564 | |
| 2565 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { |
| 2566 | .init = ipv4_inetpeer_init, |
| 2567 | .exit = ipv4_inetpeer_exit, |
| 2568 | }; |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2569 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2570 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Tejun Heo | 7d720c3 | 2010-02-16 15:20:26 +0000 | [diff] [blame] | 2571 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2572 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | int __init ip_rt_init(void) |
| 2575 | { |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 2576 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2578 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Ingo Molnar | 0dcec8c | 2009-02-25 14:07:33 +0100 | [diff] [blame] | 2579 | 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] | 2580 | if (!ip_rt_acct) |
| 2581 | panic("IP: failed to allocate ip_rt_acct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2582 | #endif |
| 2583 | |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 2584 | ipv4_dst_ops.kmem_cachep = |
| 2585 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2586 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2588 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
| 2589 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 2590 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
| 2591 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); |
| 2592 | |
| 2593 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) |
| 2594 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); |
| 2595 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 2596 | ipv4_dst_ops.gc_thresh = ~0; |
| 2597 | ip_rt_max_size = INT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | devinet_init(); |
| 2600 | ip_fib_init(); |
| 2601 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 2602 | if (ip_rt_proc_init()) |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 2603 | pr_err("Unable to create route proc files\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | #ifdef CONFIG_XFRM |
| 2605 | xfrm_init(); |
Neil Horman | a33bc5c | 2009-07-30 18:52:15 -0700 | [diff] [blame] | 2606 | xfrm4_init(ip_rt_max_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2607 | #endif |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2608 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 2609 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2610 | #ifdef CONFIG_SYSCTL |
| 2611 | register_pernet_subsys(&sysctl_route_ops); |
| 2612 | #endif |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2613 | register_pernet_subsys(&rt_genid_ops); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2614 | register_pernet_subsys(&ipv4_inetpeer_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | return rc; |
| 2616 | } |
| 2617 | |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 2618 | #ifdef CONFIG_SYSCTL |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 2619 | /* |
| 2620 | * We really need to sanitize the damn ipv4 init order, then all |
| 2621 | * this nonsense will go away. |
| 2622 | */ |
| 2623 | void __init ip_static_sysctl_init(void) |
| 2624 | { |
Eric W. Biederman | 4e5ca78 | 2012-04-19 13:32:39 +0000 | [diff] [blame] | 2625 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 2626 | } |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 2627 | #endif |