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_redirect_number __read_mostly = 9; |
| 121 | static int ip_rt_redirect_load __read_mostly = HZ / 50; |
| 122 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); |
| 123 | static int ip_rt_error_cost __read_mostly = HZ; |
| 124 | static int ip_rt_error_burst __read_mostly = 5 * HZ; |
Stephen Hemminger | 817bc4d | 2008-03-22 17:43:59 -0700 | [diff] [blame] | 125 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
| 126 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; |
| 127 | static int ip_rt_min_advmss __read_mostly = 256; |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | /* |
| 130 | * Interface to generic destination cache. |
| 131 | */ |
| 132 | |
| 133 | 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] | 134 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 135 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
| 137 | static void ipv4_link_failure(struct sk_buff *skb); |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 138 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 139 | struct sk_buff *skb, u32 mtu); |
| 140 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, |
| 141 | struct sk_buff *skb); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 142 | static void ipv4_dst_destroy(struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Eric Dumazet | 72cdd1d | 2010-11-11 07:14:07 +0000 | [diff] [blame] | 144 | static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 145 | int how) |
| 146 | { |
| 147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 149 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
| 150 | { |
David S. Miller | 3124873 | 2012-07-10 07:08:18 -0700 | [diff] [blame] | 151 | WARN_ON(1); |
| 152 | return NULL; |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 153 | } |
| 154 | |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 155 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
| 156 | struct sk_buff *skb, |
| 157 | const void *daddr); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | static struct dst_ops ipv4_dst_ops = { |
| 160 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 161 | .protocol = cpu_to_be16(ETH_P_IP), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | .check = ipv4_dst_check, |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 163 | .default_advmss = ipv4_default_advmss, |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 164 | .mtu = ipv4_mtu, |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 165 | .cow_metrics = ipv4_cow_metrics, |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 166 | .destroy = ipv4_dst_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | .ifdown = ipv4_dst_ifdown, |
| 168 | .negative_advice = ipv4_negative_advice, |
| 169 | .link_failure = ipv4_link_failure, |
| 170 | .update_pmtu = ip_rt_update_pmtu, |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 171 | .redirect = ip_do_redirect, |
Herbert Xu | 1ac06e0 | 2008-05-20 14:32:14 -0700 | [diff] [blame] | 172 | .local_out = __ip_local_out, |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 173 | .neigh_lookup = ipv4_neigh_lookup, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | }; |
| 175 | |
| 176 | #define ECN_OR_COST(class) TC_PRIO_##class |
| 177 | |
Philippe De Muyter | 4839c52 | 2007-07-09 15:32:57 -0700 | [diff] [blame] | 178 | const __u8 ip_tos2prio[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | TC_PRIO_BESTEFFORT, |
Dan Siemon | 4a2b9c3 | 2011-03-15 13:56:07 +0000 | [diff] [blame] | 180 | ECN_OR_COST(BESTEFFORT), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | TC_PRIO_BESTEFFORT, |
| 182 | ECN_OR_COST(BESTEFFORT), |
| 183 | TC_PRIO_BULK, |
| 184 | ECN_OR_COST(BULK), |
| 185 | TC_PRIO_BULK, |
| 186 | ECN_OR_COST(BULK), |
| 187 | TC_PRIO_INTERACTIVE, |
| 188 | ECN_OR_COST(INTERACTIVE), |
| 189 | TC_PRIO_INTERACTIVE, |
| 190 | ECN_OR_COST(INTERACTIVE), |
| 191 | TC_PRIO_INTERACTIVE_BULK, |
| 192 | ECN_OR_COST(INTERACTIVE_BULK), |
| 193 | TC_PRIO_INTERACTIVE_BULK, |
| 194 | ECN_OR_COST(INTERACTIVE_BULK) |
| 195 | }; |
Amir Vadai | d4a9686 | 2012-04-04 21:33:28 +0000 | [diff] [blame] | 196 | EXPORT_SYMBOL(ip_tos2prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 198 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
Eric Dumazet | 27f39c73e | 2010-05-19 22:07:23 +0000 | [diff] [blame] | 199 | #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] | 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 203 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 204 | if (*pos) |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 205 | return NULL; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 206 | return SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 210 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | ++*pos; |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 212 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 216 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
| 219 | static int rt_cache_seq_show(struct seq_file *seq, void *v) |
| 220 | { |
| 221 | if (v == SEQ_START_TOKEN) |
| 222 | seq_printf(seq, "%-127s\n", |
| 223 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" |
| 224 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" |
| 225 | "HHUptod\tSpecDst"); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 226 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 229 | static const struct seq_operations rt_cache_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | .start = rt_cache_seq_start, |
| 231 | .next = rt_cache_seq_next, |
| 232 | .stop = rt_cache_seq_stop, |
| 233 | .show = rt_cache_seq_show, |
| 234 | }; |
| 235 | |
| 236 | static int rt_cache_seq_open(struct inode *inode, struct file *file) |
| 237 | { |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 238 | return seq_open(file, &rt_cache_seq_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 241 | static const struct file_operations rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | .owner = THIS_MODULE, |
| 243 | .open = rt_cache_seq_open, |
| 244 | .read = seq_read, |
| 245 | .llseek = seq_lseek, |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 246 | .release = seq_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | }; |
| 248 | |
| 249 | |
| 250 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 251 | { |
| 252 | int cpu; |
| 253 | |
| 254 | if (*pos == 0) |
| 255 | return SEQ_START_TOKEN; |
| 256 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 257 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (!cpu_possible(cpu)) |
| 259 | continue; |
| 260 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 261 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | return NULL; |
| 264 | } |
| 265 | |
| 266 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 267 | { |
| 268 | int cpu; |
| 269 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 270 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | if (!cpu_possible(cpu)) |
| 272 | continue; |
| 273 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 274 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
| 276 | return NULL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) |
| 281 | { |
| 282 | |
| 283 | } |
| 284 | |
| 285 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) |
| 286 | { |
| 287 | struct rt_cache_stat *st = v; |
| 288 | |
| 289 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 290 | 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] | 291 | return 0; |
| 292 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
| 295 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 296 | dst_entries_get_slow(&ipv4_dst_ops), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | st->in_hit, |
| 298 | st->in_slow_tot, |
| 299 | st->in_slow_mc, |
| 300 | st->in_no_route, |
| 301 | st->in_brd, |
| 302 | st->in_martian_dst, |
| 303 | st->in_martian_src, |
| 304 | |
| 305 | st->out_hit, |
| 306 | st->out_slow_tot, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 307 | st->out_slow_mc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | st->gc_total, |
| 310 | st->gc_ignored, |
| 311 | st->gc_goal_miss, |
| 312 | st->gc_dst_overflow, |
| 313 | st->in_hlist_search, |
| 314 | st->out_hlist_search |
| 315 | ); |
| 316 | return 0; |
| 317 | } |
| 318 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 319 | static const struct seq_operations rt_cpu_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | .start = rt_cpu_seq_start, |
| 321 | .next = rt_cpu_seq_next, |
| 322 | .stop = rt_cpu_seq_stop, |
| 323 | .show = rt_cpu_seq_show, |
| 324 | }; |
| 325 | |
| 326 | |
| 327 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) |
| 328 | { |
| 329 | return seq_open(file, &rt_cpu_seq_ops); |
| 330 | } |
| 331 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 332 | static const struct file_operations rt_cpu_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | .owner = THIS_MODULE, |
| 334 | .open = rt_cpu_seq_open, |
| 335 | .read = seq_read, |
| 336 | .llseek = seq_lseek, |
| 337 | .release = seq_release, |
| 338 | }; |
| 339 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 340 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 341 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 342 | { |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 343 | struct ip_rt_acct *dst, *src; |
| 344 | unsigned int i, j; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 345 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 346 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); |
| 347 | if (!dst) |
| 348 | return -ENOMEM; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 349 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 350 | for_each_possible_cpu(i) { |
| 351 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); |
| 352 | for (j = 0; j < 256; j++) { |
| 353 | dst[j].o_bytes += src[j].o_bytes; |
| 354 | dst[j].o_packets += src[j].o_packets; |
| 355 | dst[j].i_bytes += src[j].i_bytes; |
| 356 | dst[j].i_packets += src[j].i_packets; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 357 | } |
| 358 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 359 | |
| 360 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
| 361 | kfree(dst); |
| 362 | return 0; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 363 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 364 | |
| 365 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
| 366 | { |
| 367 | return single_open(file, rt_acct_proc_show, NULL); |
| 368 | } |
| 369 | |
| 370 | static const struct file_operations rt_acct_proc_fops = { |
| 371 | .owner = THIS_MODULE, |
| 372 | .open = rt_acct_proc_open, |
| 373 | .read = seq_read, |
| 374 | .llseek = seq_lseek, |
| 375 | .release = single_release, |
| 376 | }; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 377 | #endif |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 378 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 379 | static int __net_init ip_rt_do_proc_init(struct net *net) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 380 | { |
| 381 | struct proc_dir_entry *pde; |
| 382 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 383 | pde = proc_create("rt_cache", S_IRUGO, net->proc_net, |
| 384 | &rt_cache_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 385 | if (!pde) |
| 386 | goto err1; |
| 387 | |
Wang Chen | 7702072 | 2008-02-28 14:14:25 -0800 | [diff] [blame] | 388 | pde = proc_create("rt_cache", S_IRUGO, |
| 389 | net->proc_net_stat, &rt_cpu_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 390 | if (!pde) |
| 391 | goto err2; |
| 392 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 393 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 394 | 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] | 395 | if (!pde) |
| 396 | goto err3; |
| 397 | #endif |
| 398 | return 0; |
| 399 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 400 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 401 | err3: |
| 402 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 403 | #endif |
| 404 | err2: |
| 405 | remove_proc_entry("rt_cache", net->proc_net); |
| 406 | err1: |
| 407 | return -ENOMEM; |
| 408 | } |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 409 | |
| 410 | static void __net_exit ip_rt_do_proc_exit(struct net *net) |
| 411 | { |
| 412 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 413 | remove_proc_entry("rt_cache", net->proc_net); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 414 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 415 | remove_proc_entry("rt_acct", net->proc_net); |
Alexey Dobriyan | 0a931ac | 2010-01-17 03:32:50 +0000 | [diff] [blame] | 416 | #endif |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { |
| 420 | .init = ip_rt_do_proc_init, |
| 421 | .exit = ip_rt_do_proc_exit, |
| 422 | }; |
| 423 | |
| 424 | static int __init ip_rt_proc_init(void) |
| 425 | { |
| 426 | return register_pernet_subsys(&ip_rt_proc_ops); |
| 427 | } |
| 428 | |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 429 | #else |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 430 | static inline int ip_rt_proc_init(void) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 431 | { |
| 432 | return 0; |
| 433 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | #endif /* CONFIG_PROC_FS */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 435 | |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 436 | static inline bool rt_is_expired(const struct rtable *rth) |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 437 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 438 | return rth->rt_genid != rt_genid(dev_net(rth->dst.dev)); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 439 | } |
| 440 | |
Nicolas Dichtel | 4ccfe6d | 2012-09-07 00:45:29 +0000 | [diff] [blame] | 441 | void rt_cache_flush(struct net *net) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 442 | { |
Nicolas Dichtel | b42664f | 2012-09-10 22:09:44 +0000 | [diff] [blame] | 443 | rt_genid_bump(net); |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 444 | } |
| 445 | |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 446 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
| 447 | struct sk_buff *skb, |
| 448 | const void *daddr) |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 449 | { |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 450 | struct net_device *dev = dst->dev; |
| 451 | const __be32 *pkey = daddr; |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 452 | const struct rtable *rt; |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 453 | struct neighbour *n; |
| 454 | |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 455 | rt = (const struct rtable *) dst; |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 456 | if (rt->rt_gateway) |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 457 | pkey = (const __be32 *) &rt->rt_gateway; |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 458 | else if (skb) |
| 459 | pkey = &ip_hdr(skb)->daddr; |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 460 | |
David S. Miller | 80703d2 | 2012-02-15 17:48:35 -0500 | [diff] [blame] | 461 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 462 | if (n) |
| 463 | return n; |
David Miller | 32092ec | 2011-07-25 00:01:41 +0000 | [diff] [blame] | 464 | return neigh_create(&arp_tbl, pkey, dev); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 465 | } |
| 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | /* |
| 468 | * Peer allocation may fail only in serious out-of-memory conditions. However |
| 469 | * we still can generate some output. |
| 470 | * Random ID selection looks a bit dangerous because we have no chances to |
| 471 | * select ID being unique in a reasonable period of time. |
| 472 | * But broken packet identifier may be better than no packet at all. |
| 473 | */ |
| 474 | static void ip_select_fb_ident(struct iphdr *iph) |
| 475 | { |
| 476 | static DEFINE_SPINLOCK(ip_fb_id_lock); |
| 477 | static u32 ip_fallback_id; |
| 478 | u32 salt; |
| 479 | |
| 480 | spin_lock_bh(&ip_fb_id_lock); |
Al Viro | e448515 | 2006-09-26 22:15:01 -0700 | [diff] [blame] | 481 | salt = secure_ip_id((__force __be32)ip_fallback_id ^ iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | iph->id = htons(salt & 0xFFFF); |
| 483 | ip_fallback_id = salt; |
| 484 | spin_unlock_bh(&ip_fb_id_lock); |
| 485 | } |
| 486 | |
| 487 | void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more) |
| 488 | { |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 489 | struct net *net = dev_net(dst->dev); |
| 490 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 492 | peer = inet_getpeer_v4(net->ipv4.peers, iph->daddr, 1); |
| 493 | if (peer) { |
| 494 | iph->id = htons(inet_getid(peer, more)); |
| 495 | inet_putpeer(peer); |
| 496 | return; |
| 497 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | ip_select_fb_ident(iph); |
| 500 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 501 | EXPORT_SYMBOL(__ip_select_ident); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 503 | 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] | 504 | const struct iphdr *iph, |
| 505 | int oif, u8 tos, |
| 506 | u8 prot, u32 mark, int flow_flags) |
| 507 | { |
| 508 | if (sk) { |
| 509 | const struct inet_sock *inet = inet_sk(sk); |
| 510 | |
| 511 | oif = sk->sk_bound_dev_if; |
| 512 | mark = sk->sk_mark; |
| 513 | tos = RT_CONN_FLAGS(sk); |
| 514 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; |
| 515 | } |
| 516 | flowi4_init_output(fl4, oif, mark, tos, |
| 517 | RT_SCOPE_UNIVERSE, prot, |
| 518 | flow_flags, |
| 519 | iph->daddr, iph->saddr, 0, 0); |
| 520 | } |
| 521 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 522 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
| 523 | const struct sock *sk) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 524 | { |
| 525 | const struct iphdr *iph = ip_hdr(skb); |
| 526 | int oif = skb->dev->ifindex; |
| 527 | u8 tos = RT_TOS(iph->tos); |
| 528 | u8 prot = iph->protocol; |
| 529 | u32 mark = skb->mark; |
| 530 | |
| 531 | __build_flow_key(fl4, sk, iph, oif, tos, prot, mark, 0); |
| 532 | } |
| 533 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 534 | 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] | 535 | { |
| 536 | const struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 537 | const struct ip_options_rcu *inet_opt; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 538 | __be32 daddr = inet->inet_daddr; |
| 539 | |
| 540 | rcu_read_lock(); |
| 541 | inet_opt = rcu_dereference(inet->inet_opt); |
| 542 | if (inet_opt && inet_opt->opt.srr) |
| 543 | daddr = inet_opt->opt.faddr; |
| 544 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, |
| 545 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
| 546 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, |
| 547 | inet_sk_flowi_flags(sk), |
| 548 | daddr, inet->inet_saddr, 0, 0); |
| 549 | rcu_read_unlock(); |
| 550 | } |
| 551 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 552 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
| 553 | const struct sk_buff *skb) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 554 | { |
| 555 | if (skb) |
| 556 | build_skb_flow_key(fl4, skb, sk); |
| 557 | else |
| 558 | build_sk_flow_key(fl4, sk); |
| 559 | } |
| 560 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 561 | static inline void rt_free(struct rtable *rt) |
| 562 | { |
| 563 | call_rcu(&rt->dst.rcu_head, dst_rcu_free); |
| 564 | } |
| 565 | |
| 566 | static DEFINE_SPINLOCK(fnhe_lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 567 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 568 | 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] | 569 | { |
| 570 | struct fib_nh_exception *fnhe, *oldest; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 571 | struct rtable *orig; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 572 | |
| 573 | oldest = rcu_dereference(hash->chain); |
| 574 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; |
| 575 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
| 576 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) |
| 577 | oldest = fnhe; |
| 578 | } |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 579 | orig = rcu_dereference(oldest->fnhe_rth); |
| 580 | if (orig) { |
| 581 | RCU_INIT_POINTER(oldest->fnhe_rth, NULL); |
| 582 | rt_free(orig); |
| 583 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 584 | return oldest; |
| 585 | } |
| 586 | |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 587 | static inline u32 fnhe_hashfun(__be32 daddr) |
| 588 | { |
| 589 | u32 hval; |
| 590 | |
| 591 | hval = (__force u32) daddr; |
| 592 | hval ^= (hval >> 11) ^ (hval >> 22); |
| 593 | |
| 594 | return hval & (FNHE_HASH_SIZE - 1); |
| 595 | } |
| 596 | |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 597 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
| 598 | { |
| 599 | rt->rt_pmtu = fnhe->fnhe_pmtu; |
| 600 | rt->dst.expires = fnhe->fnhe_expires; |
| 601 | |
| 602 | if (fnhe->fnhe_gw) { |
| 603 | rt->rt_flags |= RTCF_REDIRECTED; |
| 604 | rt->rt_gateway = fnhe->fnhe_gw; |
| 605 | rt->rt_uses_gateway = 1; |
| 606 | } |
| 607 | } |
| 608 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 609 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
| 610 | u32 pmtu, unsigned long expires) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 611 | { |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 612 | struct fnhe_hash_bucket *hash; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 613 | struct fib_nh_exception *fnhe; |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 614 | struct rtable *rt; |
| 615 | unsigned int i; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 616 | int depth; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 617 | u32 hval = fnhe_hashfun(daddr); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 618 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 619 | spin_lock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 620 | |
| 621 | hash = nh->nh_exceptions; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 622 | if (!hash) { |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 623 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 624 | if (!hash) |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 625 | goto out_unlock; |
| 626 | nh->nh_exceptions = hash; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 627 | } |
| 628 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 629 | hash += hval; |
| 630 | |
| 631 | depth = 0; |
| 632 | for (fnhe = rcu_dereference(hash->chain); fnhe; |
| 633 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
| 634 | if (fnhe->fnhe_daddr == daddr) |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 635 | break; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 636 | depth++; |
| 637 | } |
| 638 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 639 | if (fnhe) { |
| 640 | if (gw) |
| 641 | fnhe->fnhe_gw = gw; |
| 642 | if (pmtu) { |
| 643 | fnhe->fnhe_pmtu = pmtu; |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 644 | fnhe->fnhe_expires = max(1UL, expires); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 645 | } |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 646 | /* Update all cached dsts too */ |
| 647 | rt = rcu_dereference(fnhe->fnhe_rth); |
| 648 | if (rt) |
| 649 | fill_route_from_fnhe(rt, fnhe); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 650 | } else { |
| 651 | if (depth > FNHE_RECLAIM_DEPTH) |
| 652 | fnhe = fnhe_oldest(hash); |
| 653 | else { |
| 654 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); |
| 655 | if (!fnhe) |
| 656 | goto out_unlock; |
| 657 | |
| 658 | fnhe->fnhe_next = hash->chain; |
| 659 | rcu_assign_pointer(hash->chain, fnhe); |
| 660 | } |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 661 | fnhe->fnhe_genid = fnhe_genid(dev_net(nh->nh_dev)); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 662 | fnhe->fnhe_daddr = daddr; |
| 663 | fnhe->fnhe_gw = gw; |
| 664 | fnhe->fnhe_pmtu = pmtu; |
| 665 | fnhe->fnhe_expires = expires; |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 666 | |
| 667 | /* Exception created; mark the cached routes for the nexthop |
| 668 | * stale, so anyone caching it rechecks if this exception |
| 669 | * applies to them. |
| 670 | */ |
| 671 | for_each_possible_cpu(i) { |
| 672 | struct rtable __rcu **prt; |
| 673 | prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i); |
| 674 | rt = rcu_dereference(*prt); |
| 675 | if (rt) |
| 676 | rt->dst.obsolete = DST_OBSOLETE_KILL; |
| 677 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 678 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 679 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 680 | fnhe->fnhe_stamp = jiffies; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 681 | |
| 682 | out_unlock: |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 683 | spin_unlock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 684 | return; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 685 | } |
| 686 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 687 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
| 688 | bool kill_route) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 690 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
David S. Miller | 9420612 | 2012-07-11 20:38:08 -0700 | [diff] [blame] | 691 | __be32 old_gw = ip_hdr(skb)->saddr; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 692 | struct net_device *dev = skb->dev; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 693 | struct in_device *in_dev; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 694 | struct fib_result res; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 695 | struct neighbour *n; |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 696 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
David S. Miller | 9420612 | 2012-07-11 20:38:08 -0700 | [diff] [blame] | 698 | switch (icmp_hdr(skb)->code & 7) { |
| 699 | case ICMP_REDIR_NET: |
| 700 | case ICMP_REDIR_NETTOS: |
| 701 | case ICMP_REDIR_HOST: |
| 702 | case ICMP_REDIR_HOSTTOS: |
| 703 | break; |
| 704 | |
| 705 | default: |
| 706 | return; |
| 707 | } |
| 708 | |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 709 | if (rt->rt_gateway != old_gw) |
| 710 | return; |
| 711 | |
| 712 | in_dev = __in_dev_get_rcu(dev); |
| 713 | if (!in_dev) |
| 714 | return; |
| 715 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 716 | net = dev_net(dev); |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 717 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
| 718 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || |
| 719 | ipv4_is_zeronet(new_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | goto reject_redirect; |
| 721 | |
| 722 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
| 723 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) |
| 724 | goto reject_redirect; |
| 725 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) |
| 726 | goto reject_redirect; |
| 727 | } else { |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 728 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | goto reject_redirect; |
| 730 | } |
| 731 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 732 | n = ipv4_neigh_lookup(&rt->dst, NULL, &new_gw); |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 733 | if (n) { |
| 734 | if (!(n->nud_state & NUD_VALID)) { |
| 735 | neigh_event_send(n, NULL); |
| 736 | } else { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 737 | if (fib_lookup(net, fl4, &res) == 0) { |
| 738 | struct fib_nh *nh = &FIB_RES_NH(res); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 739 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 740 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
| 741 | 0, 0); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 742 | } |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 743 | if (kill_route) |
| 744 | rt->dst.obsolete = DST_OBSOLETE_KILL; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 745 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
| 746 | } |
| 747 | neigh_release(n); |
| 748 | } |
| 749 | return; |
| 750 | |
| 751 | reject_redirect: |
| 752 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
David S. Miller | 99ee038 | 2012-07-12 07:40:05 -0700 | [diff] [blame] | 753 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
| 754 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 755 | __be32 daddr = iph->daddr; |
| 756 | __be32 saddr = iph->saddr; |
| 757 | |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 758 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
| 759 | " Advised path = %pI4 -> %pI4\n", |
| 760 | &old_gw, dev->name, &new_gw, |
| 761 | &saddr, &daddr); |
David S. Miller | 99ee038 | 2012-07-12 07:40:05 -0700 | [diff] [blame] | 762 | } |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 763 | #endif |
| 764 | ; |
| 765 | } |
| 766 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 767 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
| 768 | { |
| 769 | struct rtable *rt; |
| 770 | struct flowi4 fl4; |
Michal Kubecek | f96ef98 | 2013-05-28 08:26:49 +0200 | [diff] [blame] | 771 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 772 | int oif = skb->dev->ifindex; |
| 773 | u8 tos = RT_TOS(iph->tos); |
| 774 | u8 prot = iph->protocol; |
| 775 | u32 mark = skb->mark; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 776 | |
| 777 | rt = (struct rtable *) dst; |
| 778 | |
Michal Kubecek | f96ef98 | 2013-05-28 08:26:49 +0200 | [diff] [blame] | 779 | __build_flow_key(&fl4, sk, iph, oif, tos, prot, mark, 0); |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 780 | __ip_do_redirect(rt, skb, &fl4, true); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 781 | } |
| 782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
| 784 | { |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 785 | struct rtable *rt = (struct rtable *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | struct dst_entry *ret = dst; |
| 787 | |
| 788 | if (rt) { |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 789 | if (dst->obsolete > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | ip_rt_put(rt); |
| 791 | ret = NULL; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 792 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
| 793 | rt->dst.expires) { |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 794 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | ret = NULL; |
| 796 | } |
| 797 | } |
| 798 | return ret; |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * Algorithm: |
| 803 | * 1. The first ip_rt_redirect_number redirects are sent |
| 804 | * with exponential backoff, then we stop sending them at all, |
| 805 | * assuming that the host ignores our redirects. |
| 806 | * 2. If we did not see packets requiring redirects |
| 807 | * during ip_rt_redirect_silence, we assume that the host |
| 808 | * forgot redirected route and start to send redirects again. |
| 809 | * |
| 810 | * This algorithm is much cheaper and more intelligent than dumb load limiting |
| 811 | * in icmp.c. |
| 812 | * |
| 813 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) |
| 814 | * and "frag. need" (breaks PMTU discovery) in icmp.c. |
| 815 | */ |
| 816 | |
| 817 | void ip_rt_send_redirect(struct sk_buff *skb) |
| 818 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 819 | struct rtable *rt = skb_rtable(skb); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 820 | struct in_device *in_dev; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 821 | struct inet_peer *peer; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 822 | struct net *net; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 823 | int log_martians; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 825 | rcu_read_lock(); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 826 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 827 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
| 828 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | return; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 830 | } |
| 831 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); |
| 832 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 834 | net = dev_net(rt->dst.dev); |
| 835 | 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] | 836 | if (!peer) { |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 837 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
| 838 | rt_nexthop(rt, ip_hdr(skb)->daddr)); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 839 | return; |
| 840 | } |
| 841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | /* No redirected packets during ip_rt_redirect_silence; |
| 843 | * reset the algorithm. |
| 844 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 845 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
| 846 | peer->rate_tokens = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
| 848 | /* Too many ignored redirects; do not send anything |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 849 | * set dst.rate_last to the last seen redirected packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 851 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
| 852 | peer->rate_last = jiffies; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 853 | goto out_put_peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | /* Check for load limit; set rate_last to the latest sent |
| 857 | * redirect. |
| 858 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 859 | if (peer->rate_tokens == 0 || |
Li Yewang | 14fb8a7 | 2006-12-18 00:26:35 -0800 | [diff] [blame] | 860 | time_after(jiffies, |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 861 | (peer->rate_last + |
| 862 | (ip_rt_redirect_load << peer->rate_tokens)))) { |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 863 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
| 864 | |
| 865 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 866 | peer->rate_last = jiffies; |
| 867 | ++peer->rate_tokens; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 869 | if (log_martians && |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 870 | peer->rate_tokens == ip_rt_redirect_number) |
| 871 | 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] | 872 | &ip_hdr(skb)->saddr, inet_iif(skb), |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 873 | &ip_hdr(skb)->daddr, &gw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | #endif |
| 875 | } |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 876 | out_put_peer: |
| 877 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | } |
| 879 | |
| 880 | static int ip_error(struct sk_buff *skb) |
| 881 | { |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 882 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 883 | struct rtable *rt = skb_rtable(skb); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 884 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | unsigned long now; |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 886 | struct net *net; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 887 | bool send; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | int code; |
| 889 | |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 890 | net = dev_net(rt->dst.dev); |
| 891 | if (!IN_DEV_FORWARD(in_dev)) { |
| 892 | switch (rt->dst.error) { |
| 893 | case EHOSTUNREACH: |
| 894 | IP_INC_STATS_BH(net, IPSTATS_MIB_INADDRERRORS); |
| 895 | break; |
| 896 | |
| 897 | case ENETUNREACH: |
| 898 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
| 899 | break; |
| 900 | } |
| 901 | goto out; |
| 902 | } |
| 903 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 904 | switch (rt->dst.error) { |
Joe Perches | 4500ebf | 2011-07-01 09:43:07 +0000 | [diff] [blame] | 905 | case EINVAL: |
| 906 | default: |
| 907 | goto out; |
| 908 | case EHOSTUNREACH: |
| 909 | code = ICMP_HOST_UNREACH; |
| 910 | break; |
| 911 | case ENETUNREACH: |
| 912 | code = ICMP_NET_UNREACH; |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 913 | IP_INC_STATS_BH(net, IPSTATS_MIB_INNOROUTES); |
Joe Perches | 4500ebf | 2011-07-01 09:43:07 +0000 | [diff] [blame] | 914 | break; |
| 915 | case EACCES: |
| 916 | code = ICMP_PKT_FILTERED; |
| 917 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 920 | 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] | 921 | |
| 922 | send = true; |
| 923 | if (peer) { |
| 924 | now = jiffies; |
| 925 | peer->rate_tokens += now - peer->rate_last; |
| 926 | if (peer->rate_tokens > ip_rt_error_burst) |
| 927 | peer->rate_tokens = ip_rt_error_burst; |
| 928 | peer->rate_last = now; |
| 929 | if (peer->rate_tokens >= ip_rt_error_cost) |
| 930 | peer->rate_tokens -= ip_rt_error_cost; |
| 931 | else |
| 932 | send = false; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 933 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 935 | if (send) |
| 936 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
| 938 | out: kfree_skb(skb); |
| 939 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 940 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 942 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 944 | struct dst_entry *dst = &rt->dst; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 945 | struct fib_result res; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 946 | |
Steffen Klassert | fa1e492 | 2013-01-16 20:58:10 +0000 | [diff] [blame] | 947 | if (dst_metric_locked(dst, RTAX_MTU)) |
| 948 | return; |
| 949 | |
Steffen Klassert | 7f92d33 | 2012-10-07 22:48:18 +0000 | [diff] [blame] | 950 | if (dst->dev->mtu < mtu) |
| 951 | return; |
| 952 | |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 953 | if (mtu < ip_rt_min_pmtu) |
| 954 | mtu = ip_rt_min_pmtu; |
Eric Dumazet | fe6fe79 | 2011-06-08 06:07:07 +0000 | [diff] [blame] | 955 | |
Timo Teräs | f016229 | 2013-05-27 20:46:32 +0000 | [diff] [blame] | 956 | if (rt->rt_pmtu == mtu && |
| 957 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) |
| 958 | return; |
| 959 | |
Eric Dumazet | c5ae7d4 | 2012-08-28 12:33:07 +0000 | [diff] [blame] | 960 | rcu_read_lock(); |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 961 | if (fib_lookup(dev_net(dst->dev), fl4, &res) == 0) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 962 | struct fib_nh *nh = &FIB_RES_NH(res); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 963 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 964 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, |
| 965 | jiffies + ip_rt_mtu_expires); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 966 | } |
Eric Dumazet | c5ae7d4 | 2012-08-28 12:33:07 +0000 | [diff] [blame] | 967 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | } |
| 969 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 970 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 971 | struct sk_buff *skb, u32 mtu) |
| 972 | { |
| 973 | struct rtable *rt = (struct rtable *) dst; |
| 974 | struct flowi4 fl4; |
| 975 | |
| 976 | ip_rt_build_flow_key(&fl4, sk, skb); |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 977 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 978 | } |
| 979 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 980 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
| 981 | int oif, u32 mark, u8 protocol, int flow_flags) |
| 982 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 983 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 984 | struct flowi4 fl4; |
| 985 | struct rtable *rt; |
| 986 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 987 | __build_flow_key(&fl4, NULL, iph, oif, |
| 988 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 989 | rt = __ip_route_output_key(net, &fl4); |
| 990 | if (!IS_ERR(rt)) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 991 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 992 | ip_rt_put(rt); |
| 993 | } |
| 994 | } |
| 995 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); |
| 996 | |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 997 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 998 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 999 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1000 | struct flowi4 fl4; |
| 1001 | struct rtable *rt; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1002 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1003 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
| 1004 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
| 1005 | if (!IS_ERR(rt)) { |
| 1006 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
| 1007 | ip_rt_put(rt); |
| 1008 | } |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1009 | } |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1010 | |
| 1011 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
| 1012 | { |
| 1013 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1014 | struct flowi4 fl4; |
| 1015 | struct rtable *rt; |
| 1016 | struct dst_entry *dst; |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1017 | bool new = false; |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1018 | |
| 1019 | bh_lock_sock(sk); |
| 1020 | rt = (struct rtable *) __sk_dst_get(sk); |
| 1021 | |
| 1022 | if (sock_owned_by_user(sk) || !rt) { |
| 1023 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
| 1024 | goto out; |
| 1025 | } |
| 1026 | |
| 1027 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
| 1028 | |
| 1029 | if (!__sk_dst_check(sk, 0)) { |
| 1030 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
| 1031 | if (IS_ERR(rt)) |
| 1032 | goto out; |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1033 | |
| 1034 | new = true; |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1035 | } |
| 1036 | |
| 1037 | __ip_rt_update_pmtu((struct rtable *) rt->dst.path, &fl4, mtu); |
| 1038 | |
| 1039 | dst = dst_check(&rt->dst, 0); |
| 1040 | if (!dst) { |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1041 | if (new) |
| 1042 | dst_release(&rt->dst); |
| 1043 | |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1044 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
| 1045 | if (IS_ERR(rt)) |
| 1046 | goto out; |
| 1047 | |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1048 | new = true; |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1049 | } |
| 1050 | |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1051 | if (new) |
| 1052 | __sk_dst_set(sk, &rt->dst); |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1053 | |
| 1054 | out: |
| 1055 | bh_unlock_sock(sk); |
| 1056 | } |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1057 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1058 | |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1059 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
| 1060 | int oif, u32 mark, u8 protocol, int flow_flags) |
| 1061 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1062 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1063 | struct flowi4 fl4; |
| 1064 | struct rtable *rt; |
| 1065 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1066 | __build_flow_key(&fl4, NULL, iph, oif, |
| 1067 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1068 | rt = __ip_route_output_key(net, &fl4); |
| 1069 | if (!IS_ERR(rt)) { |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1070 | __ip_do_redirect(rt, skb, &fl4, false); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1071 | ip_rt_put(rt); |
| 1072 | } |
| 1073 | } |
| 1074 | EXPORT_SYMBOL_GPL(ipv4_redirect); |
| 1075 | |
| 1076 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) |
| 1077 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1078 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1079 | struct flowi4 fl4; |
| 1080 | struct rtable *rt; |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1081 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1082 | __build_flow_key(&fl4, sk, iph, 0, 0, 0, 0, 0); |
| 1083 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
| 1084 | if (!IS_ERR(rt)) { |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1085 | __ip_do_redirect(rt, skb, &fl4, false); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1086 | ip_rt_put(rt); |
| 1087 | } |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1088 | } |
| 1089 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); |
| 1090 | |
David S. Miller | efbc368 | 2011-12-01 13:38:59 -0500 | [diff] [blame] | 1091 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
| 1092 | { |
| 1093 | struct rtable *rt = (struct rtable *) dst; |
| 1094 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1095 | /* All IPV4 dsts are created with ->obsolete set to the value |
| 1096 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down |
| 1097 | * into this function always. |
| 1098 | * |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 1099 | * When a PMTU/redirect information update invalidates a route, |
| 1100 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or |
| 1101 | * DST_OBSOLETE_DEAD by dst_free(). |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1102 | */ |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 1103 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
David S. Miller | efbc368 | 2011-12-01 13:38:59 -0500 | [diff] [blame] | 1104 | return NULL; |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 1105 | return dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | } |
| 1107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | static void ipv4_link_failure(struct sk_buff *skb) |
| 1109 | { |
| 1110 | struct rtable *rt; |
| 1111 | |
| 1112 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| 1113 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1114 | rt = skb_rtable(skb); |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1115 | if (rt) |
| 1116 | dst_set_expires(&rt->dst, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | static int ip_rt_bug(struct sk_buff *skb) |
| 1120 | { |
Joe Perches | 91df42b | 2012-05-15 14:11:54 +0000 | [diff] [blame] | 1121 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
| 1122 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, |
| 1123 | skb->dev ? skb->dev->name : "?"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | kfree_skb(skb); |
Dave Jones | c378a9c | 2011-05-21 07:16:42 +0000 | [diff] [blame] | 1125 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | return 0; |
| 1127 | } |
| 1128 | |
| 1129 | /* |
| 1130 | We do not cache source address of outgoing interface, |
| 1131 | because it is used only by IP RR, TS and SRR options, |
| 1132 | so that it out of fast path. |
| 1133 | |
| 1134 | BTW remember: "addr" is allowed to be not aligned |
| 1135 | in IP options! |
| 1136 | */ |
| 1137 | |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1138 | 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] | 1139 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1140 | __be32 src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1142 | if (rt_is_output_route(rt)) |
David S. Miller | c5be24f | 2011-05-13 18:01:21 -0400 | [diff] [blame] | 1143 | src = ip_hdr(skb)->saddr; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1144 | else { |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1145 | struct fib_result res; |
| 1146 | struct flowi4 fl4; |
| 1147 | struct iphdr *iph; |
| 1148 | |
| 1149 | iph = ip_hdr(skb); |
| 1150 | |
| 1151 | memset(&fl4, 0, sizeof(fl4)); |
| 1152 | fl4.daddr = iph->daddr; |
| 1153 | fl4.saddr = iph->saddr; |
Julian Anastasov | b0fe4a3 | 2011-07-23 02:00:41 +0000 | [diff] [blame] | 1154 | fl4.flowi4_tos = RT_TOS(iph->tos); |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1155 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
| 1156 | fl4.flowi4_iif = skb->dev->ifindex; |
| 1157 | fl4.flowi4_mark = skb->mark; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1158 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1159 | rcu_read_lock(); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1160 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res) == 0) |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 1161 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1162 | else |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1163 | src = inet_select_addr(rt->dst.dev, |
| 1164 | rt_nexthop(rt, iph->daddr), |
| 1165 | RT_SCOPE_UNIVERSE); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1166 | rcu_read_unlock(); |
| 1167 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | memcpy(addr, &src, 4); |
| 1169 | } |
| 1170 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1171 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | static void set_class_tag(struct rtable *rt, u32 tag) |
| 1173 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1174 | if (!(rt->dst.tclassid & 0xFFFF)) |
| 1175 | rt->dst.tclassid |= tag & 0xFFFF; |
| 1176 | if (!(rt->dst.tclassid & 0xFFFF0000)) |
| 1177 | rt->dst.tclassid |= tag & 0xFFFF0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | } |
| 1179 | #endif |
| 1180 | |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1181 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
| 1182 | { |
| 1183 | unsigned int advmss = dst_metric_raw(dst, RTAX_ADVMSS); |
| 1184 | |
| 1185 | if (advmss == 0) { |
| 1186 | advmss = max_t(unsigned int, dst->dev->mtu - 40, |
| 1187 | ip_rt_min_advmss); |
| 1188 | if (advmss > 65535 - 40) |
| 1189 | advmss = 65535 - 40; |
| 1190 | } |
| 1191 | return advmss; |
| 1192 | } |
| 1193 | |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 1194 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1195 | { |
Steffen Klassert | 261663b | 2011-11-23 02:14:50 +0000 | [diff] [blame] | 1196 | const struct rtable *rt = (const struct rtable *) dst; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1197 | unsigned int mtu = rt->rt_pmtu; |
| 1198 | |
Alexander Duyck | 98d75c3 | 2012-08-27 06:30:01 +0000 | [diff] [blame] | 1199 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1200 | mtu = dst_metric_raw(dst, RTAX_MTU); |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 1201 | |
Steffen Klassert | 38d523e | 2013-01-16 20:55:01 +0000 | [diff] [blame] | 1202 | if (mtu) |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 1203 | return mtu; |
| 1204 | |
| 1205 | mtu = dst->dev->mtu; |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1206 | |
| 1207 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1208 | if (rt->rt_uses_gateway && mtu > 576) |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1209 | mtu = 576; |
| 1210 | } |
| 1211 | |
| 1212 | if (mtu > IP_MAX_MTU) |
| 1213 | mtu = IP_MAX_MTU; |
| 1214 | |
| 1215 | return mtu; |
| 1216 | } |
| 1217 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1218 | 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] | 1219 | { |
| 1220 | struct fnhe_hash_bucket *hash = nh->nh_exceptions; |
| 1221 | struct fib_nh_exception *fnhe; |
| 1222 | u32 hval; |
| 1223 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1224 | if (!hash) |
| 1225 | return NULL; |
| 1226 | |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 1227 | hval = fnhe_hashfun(daddr); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1228 | |
| 1229 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; |
| 1230 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1231 | if (fnhe->fnhe_daddr == daddr) |
| 1232 | return fnhe; |
| 1233 | } |
| 1234 | return NULL; |
| 1235 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1236 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1237 | 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] | 1238 | __be32 daddr) |
| 1239 | { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1240 | bool ret = false; |
| 1241 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1242 | spin_lock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 1243 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1244 | if (daddr == fnhe->fnhe_daddr) { |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 1245 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
Steffen Klassert | 13d82bf | 2012-10-17 21:17:44 +0000 | [diff] [blame] | 1246 | struct rtable *orig = rcu_dereference(fnhe->fnhe_rth); |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 1247 | |
| 1248 | if (fnhe->fnhe_genid != genid) { |
| 1249 | fnhe->fnhe_genid = genid; |
Steffen Klassert | 13d82bf | 2012-10-17 21:17:44 +0000 | [diff] [blame] | 1250 | fnhe->fnhe_gw = 0; |
| 1251 | fnhe->fnhe_pmtu = 0; |
| 1252 | fnhe->fnhe_expires = 0; |
| 1253 | } |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 1254 | fill_route_from_fnhe(rt, fnhe); |
| 1255 | if (!rt->rt_gateway) |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1256 | rt->rt_gateway = daddr; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1257 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1258 | rcu_assign_pointer(fnhe->fnhe_rth, rt); |
| 1259 | if (orig) |
| 1260 | rt_free(orig); |
| 1261 | |
| 1262 | fnhe->fnhe_stamp = jiffies; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1263 | ret = true; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1264 | } |
| 1265 | spin_unlock_bh(&fnhe_lock); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1266 | |
| 1267 | return ret; |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1268 | } |
| 1269 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1270 | 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] | 1271 | { |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1272 | struct rtable *orig, *prev, **p; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1273 | bool ret = true; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1274 | |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1275 | if (rt_is_input_route(rt)) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1276 | p = (struct rtable **)&nh->nh_rth_input; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1277 | } else { |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1278 | p = (struct rtable **)__this_cpu_ptr(nh->nh_pcpu_rth_output); |
| 1279 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1280 | orig = *p; |
| 1281 | |
| 1282 | prev = cmpxchg(p, orig, rt); |
| 1283 | if (prev == orig) { |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1284 | if (orig) |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1285 | rt_free(orig); |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1286 | } else |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1287 | ret = false; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1288 | |
| 1289 | return ret; |
| 1290 | } |
| 1291 | |
| 1292 | static DEFINE_SPINLOCK(rt_uncached_lock); |
| 1293 | static LIST_HEAD(rt_uncached_list); |
| 1294 | |
| 1295 | static void rt_add_uncached_list(struct rtable *rt) |
| 1296 | { |
| 1297 | spin_lock_bh(&rt_uncached_lock); |
| 1298 | list_add_tail(&rt->rt_uncached, &rt_uncached_list); |
| 1299 | spin_unlock_bh(&rt_uncached_lock); |
| 1300 | } |
| 1301 | |
| 1302 | static void ipv4_dst_destroy(struct dst_entry *dst) |
| 1303 | { |
| 1304 | struct rtable *rt = (struct rtable *) dst; |
| 1305 | |
Eric Dumazet | 78df76a | 2012-08-24 05:40:47 +0000 | [diff] [blame] | 1306 | if (!list_empty(&rt->rt_uncached)) { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1307 | spin_lock_bh(&rt_uncached_lock); |
| 1308 | list_del(&rt->rt_uncached); |
| 1309 | spin_unlock_bh(&rt_uncached_lock); |
| 1310 | } |
| 1311 | } |
| 1312 | |
| 1313 | void rt_flush_dev(struct net_device *dev) |
| 1314 | { |
| 1315 | if (!list_empty(&rt_uncached_list)) { |
| 1316 | struct net *net = dev_net(dev); |
| 1317 | struct rtable *rt; |
| 1318 | |
| 1319 | spin_lock_bh(&rt_uncached_lock); |
| 1320 | list_for_each_entry(rt, &rt_uncached_list, rt_uncached) { |
| 1321 | if (rt->dst.dev != dev) |
| 1322 | continue; |
| 1323 | rt->dst.dev = net->loopback_dev; |
| 1324 | dev_hold(rt->dst.dev); |
| 1325 | dev_put(dev); |
| 1326 | } |
| 1327 | spin_unlock_bh(&rt_uncached_lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1328 | } |
| 1329 | } |
| 1330 | |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 1331 | static bool rt_cache_valid(const struct rtable *rt) |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1332 | { |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 1333 | return rt && |
| 1334 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && |
| 1335 | !rt_is_expired(rt); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1336 | } |
| 1337 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1338 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1339 | const struct fib_result *res, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1340 | struct fib_nh_exception *fnhe, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1341 | struct fib_info *fi, u16 type, u32 itag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1343 | bool cached = false; |
| 1344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | if (fi) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1346 | struct fib_nh *nh = &FIB_RES_NH(*res); |
| 1347 | |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1348 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1349 | rt->rt_gateway = nh->nh_gw; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1350 | rt->rt_uses_gateway = 1; |
| 1351 | } |
David S. Miller | 2860583 | 2012-07-17 14:55:59 -0700 | [diff] [blame] | 1352 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1353 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1354 | rt->dst.tclassid = nh->nh_tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | #endif |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1356 | if (unlikely(fnhe)) |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1357 | cached = rt_bind_exception(rt, fnhe, daddr); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1358 | else if (!(rt->dst.flags & DST_NOCACHE)) |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1359 | cached = rt_cache_route(nh, rt); |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1360 | if (unlikely(!cached)) { |
| 1361 | /* Routes we intend to cache in nexthop exception or |
| 1362 | * FIB nexthop have the DST_NOCACHE bit clear. |
| 1363 | * However, if we are unsuccessful at storing this |
| 1364 | * route into the cache we really need to set it. |
| 1365 | */ |
| 1366 | rt->dst.flags |= DST_NOCACHE; |
| 1367 | if (!rt->rt_gateway) |
| 1368 | rt->rt_gateway = daddr; |
| 1369 | rt_add_uncached_list(rt); |
| 1370 | } |
| 1371 | } else |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1372 | rt_add_uncached_list(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1374 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 1376 | set_class_tag(rt, res->tclassid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | #endif |
| 1378 | set_class_tag(rt, itag); |
| 1379 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | } |
| 1381 | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1382 | static struct rtable *rt_dst_alloc(struct net_device *dev, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1383 | bool nopolicy, bool noxfrm, bool will_cache) |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1384 | { |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 1385 | 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] | 1386 | (will_cache ? 0 : (DST_HOST | DST_NOCACHE)) | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1387 | (nopolicy ? DST_NOPOLICY : 0) | |
| 1388 | (noxfrm ? DST_NOXFRM : 0)); |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1389 | } |
| 1390 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1391 | /* called in rcu_read_lock() section */ |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1392 | 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] | 1393 | u8 tos, struct net_device *dev, int our) |
| 1394 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | struct rtable *rth; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1396 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | u32 itag = 0; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1398 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | |
| 1400 | /* Primary sanity checks. */ |
| 1401 | |
| 1402 | if (in_dev == NULL) |
| 1403 | return -EINVAL; |
| 1404 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1405 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1406 | skb->protocol != htons(ETH_P_IP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | goto e_inval; |
| 1408 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1409 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
| 1410 | if (ipv4_is_loopback(saddr)) |
| 1411 | goto e_inval; |
| 1412 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1413 | if (ipv4_is_zeronet(saddr)) { |
| 1414 | if (!ipv4_is_local_multicast(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | goto e_inval; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1416 | } else { |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1417 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
| 1418 | in_dev, &itag); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1419 | if (err < 0) |
| 1420 | goto e_err; |
| 1421 | } |
Benjamin LaHaise | 4e7b2f1 | 2012-03-27 15:55:32 +0000 | [diff] [blame] | 1422 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1423 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | if (!rth) |
| 1425 | goto e_nobufs; |
| 1426 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1427 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1428 | rth->dst.tclassid = itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | #endif |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1430 | rth->dst.output = ip_rt_bug; |
| 1431 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 1432 | rth->rt_genid = rt_genid(dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | rth->rt_flags = RTCF_MULTICAST; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 1434 | rth->rt_type = RTN_MULTICAST; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1435 | rth->rt_is_input= 1; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1436 | rth->rt_iif = 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1437 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1438 | rth->rt_gateway = 0; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1439 | rth->rt_uses_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1440 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | if (our) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1442 | rth->dst.input= ip_local_deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | rth->rt_flags |= RTCF_LOCAL; |
| 1444 | } |
| 1445 | |
| 1446 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1447 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1448 | rth->dst.input = ip_mr_input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | #endif |
| 1450 | RT_CACHE_STAT_INC(in_slow_mc); |
| 1451 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1452 | skb_dst_set(skb, &rth->dst); |
| 1453 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
| 1455 | e_nobufs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | e_inval: |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1458 | return -EINVAL; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1459 | e_err: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1460 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | } |
| 1462 | |
| 1463 | |
| 1464 | static void ip_handle_martian_source(struct net_device *dev, |
| 1465 | struct in_device *in_dev, |
| 1466 | struct sk_buff *skb, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1467 | __be32 daddr, |
| 1468 | __be32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | { |
| 1470 | RT_CACHE_STAT_INC(in_martian_src); |
| 1471 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1472 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { |
| 1473 | /* |
| 1474 | * RFC1812 recommendation, if source is martian, |
| 1475 | * the only hint is MAC header. |
| 1476 | */ |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1477 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1478 | &daddr, &saddr, dev->name); |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1479 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1480 | print_hex_dump(KERN_WARNING, "ll header: ", |
| 1481 | DUMP_PREFIX_OFFSET, 16, 1, |
| 1482 | skb_mac_header(skb), |
| 1483 | dev->hard_header_len, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | } |
| 1485 | } |
| 1486 | #endif |
| 1487 | } |
| 1488 | |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1489 | /* called in rcu_read_lock() section */ |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1490 | static int __mkroute_input(struct sk_buff *skb, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1491 | const struct fib_result *res, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1492 | struct in_device *in_dev, |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1493 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | struct rtable *rth; |
| 1496 | int err; |
| 1497 | struct in_device *out_dev; |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1498 | unsigned int flags = 0; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1499 | bool do_cache; |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 1500 | u32 itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | |
| 1502 | /* get a working reference to the output device */ |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1503 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | if (out_dev == NULL) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1505 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | return -EINVAL; |
| 1507 | } |
| 1508 | |
Michael Smith | 5c04c81 | 2011-04-07 04:51:50 +0000 | [diff] [blame] | 1509 | 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] | 1510 | in_dev->dev, in_dev, &itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | if (err < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1512 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | saddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | goto cleanup; |
| 1516 | } |
| 1517 | |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1518 | do_cache = res->fi && !itag; |
| 1519 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | (IN_DEV_SHARED_MEDIA(out_dev) || |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1521 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | flags |= RTCF_DOREDIRECT; |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1523 | do_cache = false; |
| 1524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | |
| 1526 | if (skb->protocol != htons(ETH_P_IP)) { |
| 1527 | /* Not IP (i.e. ARP). Do not create route, if it is |
| 1528 | * invalid for proxy arp. DNAT routes are always valid. |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 1529 | * |
| 1530 | * Proxy arp feature have been extended to allow, ARP |
| 1531 | * replies back to the same interface, to support |
| 1532 | * Private VLAN switch technologies. See arp.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | */ |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 1534 | if (out_dev == in_dev && |
| 1535 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | err = -EINVAL; |
| 1537 | goto cleanup; |
| 1538 | } |
| 1539 | } |
| 1540 | |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1541 | if (do_cache) { |
| 1542 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); |
| 1543 | if (rt_cache_valid(rth)) { |
| 1544 | skb_dst_set_noref(skb, &rth->dst); |
| 1545 | goto out; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1546 | } |
| 1547 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1548 | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1549 | rth = rt_dst_alloc(out_dev->dev, |
| 1550 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1551 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | if (!rth) { |
| 1553 | err = -ENOBUFS; |
| 1554 | goto cleanup; |
| 1555 | } |
| 1556 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1557 | rth->rt_genid = rt_genid(dev_net(rth->dst.dev)); |
| 1558 | rth->rt_flags = flags; |
| 1559 | rth->rt_type = res->type; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1560 | rth->rt_is_input = 1; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1561 | rth->rt_iif = 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1562 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1563 | rth->rt_gateway = 0; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1564 | rth->rt_uses_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1565 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1567 | rth->dst.input = ip_forward; |
| 1568 | rth->dst.output = ip_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1570 | 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] | 1571 | skb_dst_set(skb, &rth->dst); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1572 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | err = 0; |
| 1574 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | return err; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1576 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1578 | static int ip_mkroute_input(struct sk_buff *skb, |
| 1579 | struct fib_result *res, |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1580 | const struct flowi4 *fl4, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1581 | struct in_device *in_dev, |
| 1582 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | ff3fccb | 2011-03-10 16:23:24 -0800 | [diff] [blame] | 1585 | if (res->fi && res->fi->fib_nhs > 1) |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 1586 | fib_select_multipath(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | #endif |
| 1588 | |
| 1589 | /* create a routing cache entry */ |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1590 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | } |
| 1592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | /* |
| 1594 | * NOTE. We drop all the packets that has local source |
| 1595 | * addresses, because every properly looped back packet |
| 1596 | * must have correct destination already attached by output routine. |
| 1597 | * |
| 1598 | * Such approach solves two big problems: |
| 1599 | * 1. Not simplex devices are handled properly. |
| 1600 | * 2. IP spoofing attempts are filtered with 100% of guarantee. |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1601 | * called with rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | */ |
| 1603 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1604 | 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] | 1605 | u8 tos, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | { |
| 1607 | struct fib_result res; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1608 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1609 | struct flowi4 fl4; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1610 | unsigned int flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | u32 itag = 0; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1612 | struct rtable *rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | int err = -EINVAL; |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 1614 | struct net *net = dev_net(dev); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1615 | bool do_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | |
| 1617 | /* IP on this device is disabled. */ |
| 1618 | |
| 1619 | if (!in_dev) |
| 1620 | goto out; |
| 1621 | |
| 1622 | /* Check for the most weird martians, which can be not detected |
| 1623 | by fib_lookup. |
| 1624 | */ |
| 1625 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1626 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | goto martian_source; |
| 1628 | |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1629 | res.fi = NULL; |
Andy Walls | 27a954b | 2010-10-17 15:11:22 +0000 | [diff] [blame] | 1630 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | goto brd_input; |
| 1632 | |
| 1633 | /* Accept zero addresses only to limited broadcast; |
| 1634 | * I even do not know to fix it or not. Waiting for complains :-) |
| 1635 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1636 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | goto martian_source; |
| 1638 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1639 | if (ipv4_is_zeronet(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | goto martian_destination; |
| 1641 | |
Eric Dumazet | 9eb43e7 | 2012-08-03 21:27:25 +0000 | [diff] [blame] | 1642 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
| 1643 | * and call it once if daddr or/and saddr are loopback addresses |
| 1644 | */ |
| 1645 | if (ipv4_is_loopback(daddr)) { |
| 1646 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1647 | goto martian_destination; |
Eric Dumazet | 9eb43e7 | 2012-08-03 21:27:25 +0000 | [diff] [blame] | 1648 | } else if (ipv4_is_loopback(saddr)) { |
| 1649 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1650 | goto martian_source; |
| 1651 | } |
| 1652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | /* |
| 1654 | * Now we are ready to route packet. |
| 1655 | */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1656 | fl4.flowi4_oif = 0; |
| 1657 | fl4.flowi4_iif = dev->ifindex; |
| 1658 | fl4.flowi4_mark = skb->mark; |
| 1659 | fl4.flowi4_tos = tos; |
| 1660 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
| 1661 | fl4.daddr = daddr; |
| 1662 | fl4.saddr = saddr; |
| 1663 | err = fib_lookup(net, &fl4, &res); |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 1664 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | goto no_route; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
| 1667 | RT_CACHE_STAT_INC(in_slow_tot); |
| 1668 | |
| 1669 | if (res.type == RTN_BROADCAST) |
| 1670 | goto brd_input; |
| 1671 | |
| 1672 | if (res.type == RTN_LOCAL) { |
Michael Smith | 5c04c81 | 2011-04-07 04:51:50 +0000 | [diff] [blame] | 1673 | err = fib_validate_source(skb, saddr, daddr, tos, |
Pavel Emelyanov | 1fb9489 | 2012-08-08 21:53:36 +0000 | [diff] [blame] | 1674 | LOOPBACK_IFINDEX, |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1675 | dev, in_dev, &itag); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1676 | if (err < 0) |
| 1677 | goto martian_source_keep_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | goto local_input; |
| 1679 | } |
| 1680 | |
| 1681 | if (!IN_DEV_FORWARD(in_dev)) |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 1682 | goto no_route; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | if (res.type != RTN_UNICAST) |
| 1684 | goto martian_destination; |
| 1685 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1686 | err = ip_mkroute_input(skb, &res, &fl4, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | out: return err; |
| 1688 | |
| 1689 | brd_input: |
| 1690 | if (skb->protocol != htons(ETH_P_IP)) |
| 1691 | goto e_inval; |
| 1692 | |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 1693 | if (!ipv4_is_zeronet(saddr)) { |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1694 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
| 1695 | in_dev, &itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | if (err < 0) |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1697 | goto martian_source_keep_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | } |
| 1699 | flags |= RTCF_BROADCAST; |
| 1700 | res.type = RTN_BROADCAST; |
| 1701 | RT_CACHE_STAT_INC(in_brd); |
| 1702 | |
| 1703 | local_input: |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1704 | do_cache = false; |
| 1705 | if (res.fi) { |
David S. Miller | fe3edf4 | 2012-07-23 13:22:20 -0700 | [diff] [blame] | 1706 | if (!itag) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1707 | rth = rcu_dereference(FIB_RES_NH(res).nh_rth_input); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1708 | if (rt_cache_valid(rth)) { |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1709 | skb_dst_set_noref(skb, &rth->dst); |
| 1710 | err = 0; |
| 1711 | goto out; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1712 | } |
| 1713 | do_cache = true; |
| 1714 | } |
| 1715 | } |
| 1716 | |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1717 | rth = rt_dst_alloc(net->loopback_dev, |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1718 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | if (!rth) |
| 1720 | goto e_nobufs; |
| 1721 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1722 | rth->dst.input= ip_local_deliver; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1723 | rth->dst.output= ip_rt_bug; |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1724 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 1725 | rth->dst.tclassid = itag; |
| 1726 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1728 | rth->rt_genid = rt_genid(net); |
| 1729 | rth->rt_flags = flags|RTCF_LOCAL; |
| 1730 | rth->rt_type = res.type; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1731 | rth->rt_is_input = 1; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1732 | rth->rt_iif = 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1733 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1734 | rth->rt_gateway = 0; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1735 | rth->rt_uses_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1736 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | if (res.type == RTN_UNREACHABLE) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1738 | rth->dst.input= ip_error; |
| 1739 | rth->dst.error= -err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | rth->rt_flags &= ~RTCF_LOCAL; |
| 1741 | } |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1742 | if (do_cache) |
| 1743 | rt_cache_route(&FIB_RES_NH(res), rth); |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1744 | skb_dst_set(skb, &rth->dst); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1745 | err = 0; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1746 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
| 1748 | no_route: |
| 1749 | RT_CACHE_STAT_INC(in_no_route); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | res.type = RTN_UNREACHABLE; |
Mitsuru Chinen | 7f53878 | 2007-12-07 01:07:24 -0800 | [diff] [blame] | 1751 | if (err == -ESRCH) |
| 1752 | err = -ENETUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | goto local_input; |
| 1754 | |
| 1755 | /* |
| 1756 | * Do not cache martian addresses: they should be logged (RFC1812) |
| 1757 | */ |
| 1758 | martian_destination: |
| 1759 | RT_CACHE_STAT_INC(in_martian_dst); |
| 1760 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1761 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
| 1762 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", |
| 1763 | &daddr, &saddr, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | #endif |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 1765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | e_inval: |
| 1767 | err = -EINVAL; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1768 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | |
| 1770 | e_nobufs: |
| 1771 | err = -ENOBUFS; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1772 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | |
| 1774 | martian_source: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1775 | err = -EINVAL; |
| 1776 | martian_source_keep_err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1778 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | } |
| 1780 | |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1781 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
| 1782 | u8 tos, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1784 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1786 | rcu_read_lock(); |
| 1787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | /* Multicast recognition logic is moved from route cache to here. |
| 1789 | The problem was that too many Ethernet cards have broken/missing |
| 1790 | hardware multicast filters :-( As result the host on multicasting |
| 1791 | network acquires a lot of useless route cache entries, sort of |
| 1792 | SDR messages from all the world. Now we try to get rid of them. |
| 1793 | Really, provided software IP multicast filter is organized |
| 1794 | reasonably (at least, hashed), it does not result in a slowdown |
| 1795 | comparing with route cache reject entries. |
| 1796 | Note, that multicast routers are not affected, because |
| 1797 | route cache entry is created eventually. |
| 1798 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1799 | if (ipv4_is_multicast(daddr)) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1800 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1802 | if (in_dev) { |
David S. Miller | dbdd9a5 | 2011-03-10 16:34:38 -0800 | [diff] [blame] | 1803 | int our = ip_check_mc_rcu(in_dev, daddr, saddr, |
| 1804 | ip_hdr(skb)->protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | if (our |
| 1806 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 1807 | || |
| 1808 | (!ipv4_is_local_multicast(daddr) && |
| 1809 | IN_DEV_MFORWARD(in_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | #endif |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 1811 | ) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1812 | int res = ip_route_input_mc(skb, daddr, saddr, |
| 1813 | tos, dev, our); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | rcu_read_unlock(); |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1815 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | } |
| 1817 | } |
| 1818 | rcu_read_unlock(); |
| 1819 | return -EINVAL; |
| 1820 | } |
David S. Miller | c10237e | 2012-06-27 17:05:06 -0700 | [diff] [blame] | 1821 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1822 | rcu_read_unlock(); |
| 1823 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | } |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1825 | EXPORT_SYMBOL(ip_route_input_noref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1827 | /* called with rcu_read_lock() */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1828 | static struct rtable *__mkroute_output(const struct fib_result *res, |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 1829 | const struct flowi4 *fl4, int orig_oif, |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 1830 | struct net_device *dev_out, |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1831 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | { |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1833 | struct fib_info *fi = res->fi; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1834 | struct fib_nh_exception *fnhe; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1835 | struct in_device *in_dev; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1836 | u16 type = res->type; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1837 | struct rtable *rth; |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 1838 | bool do_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1840 | in_dev = __in_dev_get_rcu(dev_out); |
| 1841 | if (!in_dev) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1842 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1844 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
| 1845 | if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK)) |
| 1846 | return ERR_PTR(-EINVAL); |
| 1847 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1848 | if (ipv4_is_lbcast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1849 | type = RTN_BROADCAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1850 | else if (ipv4_is_multicast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1851 | type = RTN_MULTICAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1852 | else if (ipv4_is_zeronet(fl4->daddr)) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1853 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | |
| 1855 | if (dev_out->flags & IFF_LOOPBACK) |
| 1856 | flags |= RTCF_LOCAL; |
| 1857 | |
Julian Anastasov | 6361742 | 2012-11-22 23:04:14 +0200 | [diff] [blame] | 1858 | do_cache = true; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1859 | if (type == RTN_BROADCAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1861 | fi = NULL; |
| 1862 | } else if (type == RTN_MULTICAST) { |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 1863 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1864 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
| 1865 | fl4->flowi4_proto)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | flags &= ~RTCF_LOCAL; |
Julian Anastasov | 6361742 | 2012-11-22 23:04:14 +0200 | [diff] [blame] | 1867 | else |
| 1868 | do_cache = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | /* If multicast route do not exist use |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 1870 | * default one, but do not gateway in this case. |
| 1871 | * Yes, it is hack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1873 | if (fi && res->prefixlen < 4) |
| 1874 | fi = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | } |
| 1876 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1877 | fnhe = NULL; |
Julian Anastasov | 6361742 | 2012-11-22 23:04:14 +0200 | [diff] [blame] | 1878 | do_cache &= fi != NULL; |
| 1879 | if (do_cache) { |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1880 | struct rtable __rcu **prth; |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 1881 | struct fib_nh *nh = &FIB_RES_NH(*res); |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1882 | |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 1883 | fnhe = find_exception(nh, fl4->daddr); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1884 | if (fnhe) |
| 1885 | prth = &fnhe->fnhe_rth; |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 1886 | else { |
| 1887 | if (unlikely(fl4->flowi4_flags & |
| 1888 | FLOWI_FLAG_KNOWN_NH && |
| 1889 | !(nh->nh_gw && |
| 1890 | nh->nh_scope == RT_SCOPE_LINK))) { |
| 1891 | do_cache = false; |
| 1892 | goto add; |
| 1893 | } |
| 1894 | prth = __this_cpu_ptr(nh->nh_pcpu_rth_output); |
| 1895 | } |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1896 | rth = rcu_dereference(*prth); |
| 1897 | if (rt_cache_valid(rth)) { |
| 1898 | dst_hold(&rth->dst); |
| 1899 | return rth; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1900 | } |
| 1901 | } |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 1902 | |
| 1903 | add: |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1904 | rth = rt_dst_alloc(dev_out, |
| 1905 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1906 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 1907 | do_cache); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 1908 | if (!rth) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1909 | return ERR_PTR(-ENOBUFS); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 1910 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1911 | rth->dst.output = ip_output; |
| 1912 | |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1913 | rth->rt_genid = rt_genid(dev_net(dev_out)); |
| 1914 | rth->rt_flags = flags; |
| 1915 | rth->rt_type = type; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1916 | rth->rt_is_input = 0; |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 1917 | rth->rt_iif = orig_oif ? : 0; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1918 | rth->rt_pmtu = 0; |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1919 | rth->rt_gateway = 0; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1920 | rth->rt_uses_gateway = 0; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1921 | INIT_LIST_HEAD(&rth->rt_uncached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | |
| 1923 | RT_CACHE_STAT_INC(out_slow_tot); |
| 1924 | |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 1925 | if (flags & RTCF_LOCAL) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1926 | rth->dst.input = ip_local_deliver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1928 | if (flags & RTCF_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | !(dev_out->flags & IFF_LOOPBACK)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1930 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | RT_CACHE_STAT_INC(out_slow_mc); |
| 1932 | } |
| 1933 | #ifdef CONFIG_IP_MROUTE |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1934 | if (type == RTN_MULTICAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | if (IN_DEV_MFORWARD(in_dev) && |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1936 | !ipv4_is_local_multicast(fl4->daddr)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1937 | rth->dst.input = ip_mr_input; |
| 1938 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | } |
| 1940 | } |
| 1941 | #endif |
| 1942 | } |
| 1943 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1944 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1946 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | } |
| 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | /* |
| 1950 | * Major route resolver routine. |
| 1951 | */ |
| 1952 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1953 | struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | struct net_device *dev_out = NULL; |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 1956 | __u8 tos = RT_FL_TOS(fl4); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1957 | unsigned int flags = 0; |
| 1958 | struct fib_result res; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 1959 | struct rtable *rth; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1960 | int orig_oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 1962 | res.tclassid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | res.fi = NULL; |
David S. Miller | 8b96d22 | 2012-06-11 02:01:56 -0700 | [diff] [blame] | 1964 | res.table = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1966 | orig_oif = fl4->flowi4_oif; |
| 1967 | |
Pavel Emelyanov | 1fb9489 | 2012-08-08 21:53:36 +0000 | [diff] [blame] | 1968 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1969 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
| 1970 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? |
| 1971 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); |
David S. Miller | 44713b6 | 2011-03-04 21:24:47 -0800 | [diff] [blame] | 1972 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 1973 | rcu_read_lock(); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1974 | if (fl4->saddr) { |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1975 | rth = ERR_PTR(-EINVAL); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1976 | if (ipv4_is_multicast(fl4->saddr) || |
| 1977 | ipv4_is_lbcast(fl4->saddr) || |
| 1978 | ipv4_is_zeronet(fl4->saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | goto out; |
| 1980 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | /* I removed check for oif == dev_out->oif here. |
| 1982 | It was wrong for two reasons: |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 1983 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
| 1984 | is assigned to multiple interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | 2. Moreover, we are allowed to send packets with saddr |
| 1986 | of another iface. --ANK |
| 1987 | */ |
| 1988 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1989 | if (fl4->flowi4_oif == 0 && |
| 1990 | (ipv4_is_multicast(fl4->daddr) || |
| 1991 | ipv4_is_lbcast(fl4->daddr))) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1992 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 1993 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 1994 | if (dev_out == NULL) |
| 1995 | goto out; |
| 1996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | /* Special hack: user can direct multicasts |
| 1998 | and limited broadcast via necessary interface |
| 1999 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. |
| 2000 | This hack is not just for fun, it allows |
| 2001 | vic,vat and friends to work. |
| 2002 | They bind socket to loopback, set ttl to zero |
| 2003 | and expect that it will work. |
| 2004 | From the viewpoint of routing cache they are broken, |
| 2005 | because we are not allowed to build multicast path |
| 2006 | with loopback source addr (look, routing cache |
| 2007 | cannot know, that ttl is zero, so that packet |
| 2008 | will not leave this host and route is valid). |
| 2009 | Luckily, this hack is good workaround. |
| 2010 | */ |
| 2011 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2012 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | goto make_route; |
| 2014 | } |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2015 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2016 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2017 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2018 | if (!__ip_dev_find(net, fl4->saddr, false)) |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2019 | goto out; |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2020 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | } |
| 2022 | |
| 2023 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2024 | if (fl4->flowi4_oif) { |
| 2025 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2026 | rth = ERR_PTR(-ENODEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | if (dev_out == NULL) |
| 2028 | goto out; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2029 | |
| 2030 | /* RACE: Check return value of inet_select_addr instead. */ |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 2031 | 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] | 2032 | rth = ERR_PTR(-ENETUNREACH); |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 2033 | goto out; |
| 2034 | } |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2035 | if (ipv4_is_local_multicast(fl4->daddr) || |
| 2036 | ipv4_is_lbcast(fl4->daddr)) { |
| 2037 | if (!fl4->saddr) |
| 2038 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2039 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | goto make_route; |
| 2041 | } |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2042 | if (fl4->saddr) { |
| 2043 | if (ipv4_is_multicast(fl4->daddr)) |
| 2044 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2045 | fl4->flowi4_scope); |
| 2046 | else if (!fl4->daddr) |
| 2047 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2048 | RT_SCOPE_HOST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | } |
| 2050 | } |
| 2051 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2052 | if (!fl4->daddr) { |
| 2053 | fl4->daddr = fl4->saddr; |
| 2054 | if (!fl4->daddr) |
| 2055 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2056 | dev_out = net->loopback_dev; |
Pavel Emelyanov | 1fb9489 | 2012-08-08 21:53:36 +0000 | [diff] [blame] | 2057 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | res.type = RTN_LOCAL; |
| 2059 | flags |= RTCF_LOCAL; |
| 2060 | goto make_route; |
| 2061 | } |
| 2062 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2063 | if (fib_lookup(net, fl4, &res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | res.fi = NULL; |
David S. Miller | 8b96d22 | 2012-06-11 02:01:56 -0700 | [diff] [blame] | 2065 | res.table = NULL; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2066 | if (fl4->flowi4_oif) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | /* Apparently, routing tables are wrong. Assume, |
| 2068 | that the destination is on link. |
| 2069 | |
| 2070 | WHY? DW. |
| 2071 | Because we are allowed to send to iface |
| 2072 | even if it has NO routes and NO assigned |
| 2073 | addresses. When oif is specified, routing |
| 2074 | tables are looked up with only one purpose: |
| 2075 | to catch if destination is gatewayed, rather than |
| 2076 | direct. Moreover, if MSG_DONTROUTE is set, |
| 2077 | we send packet, ignoring both routing tables |
| 2078 | and ifaddr state. --ANK |
| 2079 | |
| 2080 | |
| 2081 | We could make it even if oif is unknown, |
| 2082 | likely IPv6, but we do not. |
| 2083 | */ |
| 2084 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2085 | if (fl4->saddr == 0) |
| 2086 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2087 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | res.type = RTN_UNICAST; |
| 2089 | goto make_route; |
| 2090 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2091 | rth = ERR_PTR(-ENETUNREACH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | goto out; |
| 2093 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | |
| 2095 | if (res.type == RTN_LOCAL) { |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2096 | if (!fl4->saddr) { |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2097 | if (res.fi->fib_prefsrc) |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2098 | fl4->saddr = res.fi->fib_prefsrc; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2099 | else |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2100 | fl4->saddr = fl4->daddr; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2101 | } |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2102 | dev_out = net->loopback_dev; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2103 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | flags |= RTCF_LOCAL; |
| 2105 | goto make_route; |
| 2106 | } |
| 2107 | |
| 2108 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2109 | if (res.fi->fib_nhs > 1 && fl4->flowi4_oif == 0) |
David S. Miller | 1b7fe593 | 2011-03-10 17:01:16 -0800 | [diff] [blame] | 2110 | fib_select_multipath(&res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | else |
| 2112 | #endif |
David S. Miller | 21d8c49 | 2011-04-14 14:49:37 -0700 | [diff] [blame] | 2113 | if (!res.prefixlen && |
| 2114 | res.table->tb_num_default > 1 && |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2115 | res.type == RTN_UNICAST && !fl4->flowi4_oif) |
David S. Miller | 0c838ff | 2011-01-31 16:16:50 -0800 | [diff] [blame] | 2116 | fib_select_default(&res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2118 | if (!fl4->saddr) |
| 2119 | fl4->saddr = FIB_RES_PREFSRC(net, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | dev_out = FIB_RES_DEV(res); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2122 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | |
| 2124 | |
| 2125 | make_route: |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2126 | rth = __mkroute_output(&res, fl4, orig_oif, dev_out, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2128 | out: |
| 2129 | rcu_read_unlock(); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2130 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2132 | EXPORT_SYMBOL_GPL(__ip_route_output_key); |
| 2133 | |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2134 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
| 2135 | { |
| 2136 | return NULL; |
| 2137 | } |
| 2138 | |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 2139 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2140 | { |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 2141 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
| 2142 | |
| 2143 | return mtu ? : dst->dev->mtu; |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2144 | } |
| 2145 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 2146 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 2147 | struct sk_buff *skb, u32 mtu) |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2148 | { |
| 2149 | } |
| 2150 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 2151 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
| 2152 | struct sk_buff *skb) |
David S. Miller | b587ee3 | 2012-07-12 00:39:24 -0700 | [diff] [blame] | 2153 | { |
| 2154 | } |
| 2155 | |
Held Bernhard | 0972ddb | 2011-04-24 22:07:32 +0000 | [diff] [blame] | 2156 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
| 2157 | unsigned long old) |
| 2158 | { |
| 2159 | return NULL; |
| 2160 | } |
| 2161 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2162 | static struct dst_ops ipv4_dst_blackhole_ops = { |
| 2163 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 2164 | .protocol = cpu_to_be16(ETH_P_IP), |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2165 | .check = ipv4_blackhole_dst_check, |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 2166 | .mtu = ipv4_blackhole_mtu, |
Eric Dumazet | 214f45c | 2011-02-18 11:39:01 -0800 | [diff] [blame] | 2167 | .default_advmss = ipv4_default_advmss, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2168 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
David S. Miller | b587ee3 | 2012-07-12 00:39:24 -0700 | [diff] [blame] | 2169 | .redirect = ipv4_rt_blackhole_redirect, |
Held Bernhard | 0972ddb | 2011-04-24 22:07:32 +0000 | [diff] [blame] | 2170 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 2171 | .neigh_lookup = ipv4_neigh_lookup, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2172 | }; |
| 2173 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2174 | 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] | 2175 | { |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2176 | struct rtable *ort = (struct rtable *) dst_orig; |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 2177 | struct rtable *rt; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2178 | |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 2179 | 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] | 2180 | if (rt) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2181 | struct dst_entry *new = &rt->dst; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2182 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2183 | new->__use = 1; |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 2184 | new->input = dst_discard; |
| 2185 | new->output = dst_discard; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2186 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2187 | new->dev = ort->dst.dev; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2188 | if (new->dev) |
| 2189 | dev_hold(new->dev); |
| 2190 | |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 2191 | rt->rt_is_input = ort->rt_is_input; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2192 | rt->rt_iif = ort->rt_iif; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 2193 | rt->rt_pmtu = ort->rt_pmtu; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2194 | |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 2195 | rt->rt_genid = rt_genid(net); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2196 | rt->rt_flags = ort->rt_flags; |
| 2197 | rt->rt_type = ort->rt_type; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2198 | rt->rt_gateway = ort->rt_gateway; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 2199 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2200 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 2201 | INIT_LIST_HEAD(&rt->rt_uncached); |
| 2202 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2203 | dst_free(new); |
| 2204 | } |
| 2205 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2206 | dst_release(dst_orig); |
| 2207 | |
| 2208 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2209 | } |
| 2210 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2211 | 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] | 2212 | struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2214 | struct rtable *rt = __ip_route_output_key(net, flp4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2216 | if (IS_ERR(rt)) |
| 2217 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | |
David S. Miller | 5615787 | 2011-05-02 14:37:45 -0700 | [diff] [blame] | 2219 | if (flp4->flowi4_proto) |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2220 | rt = (struct rtable *) xfrm_lookup(net, &rt->dst, |
| 2221 | flowi4_to_flowi(flp4), |
| 2222 | sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2224 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2226 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
| 2227 | |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2228 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2229 | struct flowi4 *fl4, struct sk_buff *skb, u32 portid, |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2230 | u32 seq, int event, int nowait, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2232 | struct rtable *rt = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | struct rtmsg *r; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2234 | struct nlmsghdr *nlh; |
Steffen Klassert | 2bc8ca4 | 2011-10-11 01:12:02 +0000 | [diff] [blame] | 2235 | unsigned long expires = 0; |
David S. Miller | f185071 | 2012-07-10 07:26:01 -0700 | [diff] [blame] | 2236 | u32 error; |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2237 | u32 metrics[RTAX_MAX]; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2238 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2239 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags); |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2240 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2241 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2242 | |
| 2243 | r = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | r->rtm_family = AF_INET; |
| 2245 | r->rtm_dst_len = 32; |
| 2246 | r->rtm_src_len = 0; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2247 | r->rtm_tos = fl4->flowi4_tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | r->rtm_table = RT_TABLE_MAIN; |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2249 | if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN)) |
| 2250 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | r->rtm_type = rt->rt_type; |
| 2252 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2253 | r->rtm_protocol = RTPROT_UNSPEC; |
| 2254 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 2255 | if (rt->rt_flags & RTCF_NOTIFY) |
| 2256 | r->rtm_flags |= RTM_F_NOTIFY; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2257 | |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2258 | if (nla_put_be32(skb, RTA_DST, dst)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2259 | goto nla_put_failure; |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2260 | if (src) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | r->rtm_src_len = 32; |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2262 | if (nla_put_be32(skb, RTA_SRC, src)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2263 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | } |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2265 | if (rt->dst.dev && |
| 2266 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
| 2267 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2268 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2269 | if (rt->dst.tclassid && |
| 2270 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) |
| 2271 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | #endif |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 2273 | if (!rt_is_input_route(rt) && |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2274 | fl4->saddr != src) { |
| 2275 | if (nla_put_be32(skb, RTA_PREFSRC, fl4->saddr)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2276 | goto nla_put_failure; |
| 2277 | } |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 2278 | if (rt->rt_uses_gateway && |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2279 | nla_put_be32(skb, RTA_GATEWAY, rt->rt_gateway)) |
| 2280 | goto nla_put_failure; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2281 | |
Steffen Klassert | ee9a8f7 | 2012-10-08 00:56:54 +0000 | [diff] [blame] | 2282 | expires = rt->dst.expires; |
| 2283 | if (expires) { |
| 2284 | unsigned long now = jiffies; |
| 2285 | |
| 2286 | if (time_before(now, expires)) |
| 2287 | expires -= now; |
| 2288 | else |
| 2289 | expires = 0; |
| 2290 | } |
| 2291 | |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2292 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
Steffen Klassert | ee9a8f7 | 2012-10-08 00:56:54 +0000 | [diff] [blame] | 2293 | if (rt->rt_pmtu && expires) |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2294 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
| 2295 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2296 | goto nla_put_failure; |
| 2297 | |
David Miller | b486988 | 2012-07-01 02:03:01 +0000 | [diff] [blame] | 2298 | if (fl4->flowi4_mark && |
stephen hemminger | 68aaed5 | 2012-10-10 08:27:25 +0000 | [diff] [blame] | 2299 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2300 | goto nla_put_failure; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2301 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2302 | error = rt->dst.error; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2303 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 2304 | if (rt_is_input_route(rt)) { |
Nicolas Dichtel | 8caaf7b | 2012-12-04 01:03:07 +0000 | [diff] [blame] | 2305 | #ifdef CONFIG_IP_MROUTE |
| 2306 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
| 2307 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { |
| 2308 | int err = ipmr_get_route(net, skb, |
| 2309 | fl4->saddr, fl4->daddr, |
| 2310 | r, nowait); |
| 2311 | if (err <= 0) { |
| 2312 | if (!nowait) { |
| 2313 | if (err == 0) |
| 2314 | return 0; |
| 2315 | goto nla_put_failure; |
| 2316 | } else { |
| 2317 | if (err == -EMSGSIZE) |
| 2318 | goto nla_put_failure; |
| 2319 | error = err; |
| 2320 | } |
| 2321 | } |
| 2322 | } else |
| 2323 | #endif |
| 2324 | if (nla_put_u32(skb, RTA_IIF, rt->rt_iif)) |
| 2325 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | } |
| 2327 | |
David S. Miller | f185071 | 2012-07-10 07:26:01 -0700 | [diff] [blame] | 2328 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2329 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2331 | return nlmsg_end(skb, nlh); |
| 2332 | |
| 2333 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2334 | nlmsg_cancel(skb, nlh); |
| 2335 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | } |
| 2337 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 2338 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2340 | struct net *net = sock_net(in_skb->sk); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2341 | struct rtmsg *rtm; |
| 2342 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | struct rtable *rt = NULL; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2344 | struct flowi4 fl4; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2345 | __be32 dst = 0; |
| 2346 | __be32 src = 0; |
| 2347 | u32 iif; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2348 | int err; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2349 | int mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | struct sk_buff *skb; |
| 2351 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2352 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy); |
| 2353 | if (err < 0) |
| 2354 | goto errout; |
| 2355 | |
| 2356 | rtm = nlmsg_data(nlh); |
| 2357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2359 | if (skb == NULL) { |
| 2360 | err = -ENOBUFS; |
| 2361 | goto errout; |
| 2362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | |
| 2364 | /* Reserve room for dummy headers, this skb can pass |
| 2365 | through good chunk of routing engine. |
| 2366 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 2367 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2368 | skb_reset_network_header(skb); |
Stephen Hemminger | d2c962b | 2006-04-17 17:27:11 -0700 | [diff] [blame] | 2369 | |
| 2370 | /* 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] | 2371 | ip_hdr(skb)->protocol = IPPROTO_ICMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
| 2373 | |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 2374 | src = tb[RTA_SRC] ? nla_get_be32(tb[RTA_SRC]) : 0; |
| 2375 | dst = tb[RTA_DST] ? nla_get_be32(tb[RTA_DST]) : 0; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2376 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2377 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2379 | memset(&fl4, 0, sizeof(fl4)); |
| 2380 | fl4.daddr = dst; |
| 2381 | fl4.saddr = src; |
| 2382 | fl4.flowi4_tos = rtm->rtm_tos; |
| 2383 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; |
| 2384 | fl4.flowi4_mark = mark; |
| 2385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2386 | if (iif) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2387 | struct net_device *dev; |
| 2388 | |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2389 | dev = __dev_get_by_index(net, iif); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2390 | if (dev == NULL) { |
| 2391 | err = -ENODEV; |
| 2392 | goto errout_free; |
| 2393 | } |
| 2394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | skb->protocol = htons(ETH_P_IP); |
| 2396 | skb->dev = dev; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2397 | skb->mark = mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | local_bh_disable(); |
| 2399 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); |
| 2400 | local_bh_enable(); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2401 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2402 | rt = skb_rtable(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2403 | if (err == 0 && rt->dst.error) |
| 2404 | err = -rt->dst.error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | } else { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2406 | rt = ip_route_output_key(net, &fl4); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2407 | |
| 2408 | err = 0; |
| 2409 | if (IS_ERR(rt)) |
| 2410 | err = PTR_ERR(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | } |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | if (err) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2414 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2416 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 2418 | rt->rt_flags |= RTCF_NOTIFY; |
| 2419 | |
David S. Miller | f1ce306 | 2012-07-12 10:10:17 -0700 | [diff] [blame] | 2420 | err = rt_fill_info(net, dst, src, &fl4, skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2421 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2422 | RTM_NEWROUTE, 0, 0); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2423 | if (err <= 0) |
| 2424 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2426 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2427 | errout: |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2428 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2430 | errout_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | kfree_skb(skb); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2432 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | } |
| 2434 | |
| 2435 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 2436 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | return skb->len; |
| 2438 | } |
| 2439 | |
| 2440 | void ip_rt_multicast_event(struct in_device *in_dev) |
| 2441 | { |
Nicolas Dichtel | 4ccfe6d | 2012-09-07 00:45:29 +0000 | [diff] [blame] | 2442 | rt_cache_flush(dev_net(in_dev->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | } |
| 2444 | |
| 2445 | #ifdef CONFIG_SYSCTL |
Gao feng | 082c7ca | 2013-02-19 00:43:12 +0000 | [diff] [blame] | 2446 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
| 2447 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
| 2448 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; |
| 2449 | static int ip_rt_gc_elasticity __read_mostly = 8; |
| 2450 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2451 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2452 | void __user *buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | size_t *lenp, loff_t *ppos) |
| 2454 | { |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 2455 | struct net *net = (struct net *)__ctl->extra1; |
| 2456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | if (write) { |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 2458 | rt_cache_flush(net); |
| 2459 | fnhe_genid_bump(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2461 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | |
| 2463 | return -EINVAL; |
| 2464 | } |
| 2465 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2466 | static struct ctl_table ipv4_route_table[] = { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2467 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | .procname = "gc_thresh", |
| 2469 | .data = &ipv4_dst_ops.gc_thresh, |
| 2470 | .maxlen = sizeof(int), |
| 2471 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2472 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | }, |
| 2474 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | .procname = "max_size", |
| 2476 | .data = &ip_rt_max_size, |
| 2477 | .maxlen = sizeof(int), |
| 2478 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2479 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2480 | }, |
| 2481 | { |
| 2482 | /* Deprecated. Use gc_min_interval_ms */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | .procname = "gc_min_interval", |
| 2485 | .data = &ip_rt_gc_min_interval, |
| 2486 | .maxlen = sizeof(int), |
| 2487 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2488 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | }, |
| 2490 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | .procname = "gc_min_interval_ms", |
| 2492 | .data = &ip_rt_gc_min_interval, |
| 2493 | .maxlen = sizeof(int), |
| 2494 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2495 | .proc_handler = proc_dointvec_ms_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | }, |
| 2497 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2498 | .procname = "gc_timeout", |
| 2499 | .data = &ip_rt_gc_timeout, |
| 2500 | .maxlen = sizeof(int), |
| 2501 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2502 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2503 | }, |
| 2504 | { |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 2505 | .procname = "gc_interval", |
| 2506 | .data = &ip_rt_gc_interval, |
| 2507 | .maxlen = sizeof(int), |
| 2508 | .mode = 0644, |
| 2509 | .proc_handler = proc_dointvec_jiffies, |
| 2510 | }, |
| 2511 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | .procname = "redirect_load", |
| 2513 | .data = &ip_rt_redirect_load, |
| 2514 | .maxlen = sizeof(int), |
| 2515 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2516 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | }, |
| 2518 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2519 | .procname = "redirect_number", |
| 2520 | .data = &ip_rt_redirect_number, |
| 2521 | .maxlen = sizeof(int), |
| 2522 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2523 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | }, |
| 2525 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | .procname = "redirect_silence", |
| 2527 | .data = &ip_rt_redirect_silence, |
| 2528 | .maxlen = sizeof(int), |
| 2529 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2530 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2531 | }, |
| 2532 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2533 | .procname = "error_cost", |
| 2534 | .data = &ip_rt_error_cost, |
| 2535 | .maxlen = sizeof(int), |
| 2536 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2537 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2538 | }, |
| 2539 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | .procname = "error_burst", |
| 2541 | .data = &ip_rt_error_burst, |
| 2542 | .maxlen = sizeof(int), |
| 2543 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2544 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | }, |
| 2546 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | .procname = "gc_elasticity", |
| 2548 | .data = &ip_rt_gc_elasticity, |
| 2549 | .maxlen = sizeof(int), |
| 2550 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2551 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2552 | }, |
| 2553 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | .procname = "mtu_expires", |
| 2555 | .data = &ip_rt_mtu_expires, |
| 2556 | .maxlen = sizeof(int), |
| 2557 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2558 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | }, |
| 2560 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2561 | .procname = "min_pmtu", |
| 2562 | .data = &ip_rt_min_pmtu, |
| 2563 | .maxlen = sizeof(int), |
| 2564 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2565 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | }, |
| 2567 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2568 | .procname = "min_adv_mss", |
| 2569 | .data = &ip_rt_min_advmss, |
| 2570 | .maxlen = sizeof(int), |
| 2571 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2572 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2574 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2575 | }; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2576 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2577 | static struct ctl_table ipv4_route_flush_table[] = { |
| 2578 | { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2579 | .procname = "flush", |
| 2580 | .maxlen = sizeof(int), |
| 2581 | .mode = 0200, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2582 | .proc_handler = ipv4_sysctl_rtcache_flush, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2583 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2584 | { }, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2585 | }; |
| 2586 | |
| 2587 | static __net_init int sysctl_route_net_init(struct net *net) |
| 2588 | { |
| 2589 | struct ctl_table *tbl; |
| 2590 | |
| 2591 | tbl = ipv4_route_flush_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2592 | if (!net_eq(net, &init_net)) { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2593 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
| 2594 | if (tbl == NULL) |
| 2595 | goto err_dup; |
Eric W. Biederman | 464dc80 | 2012-11-16 03:02:59 +0000 | [diff] [blame] | 2596 | |
| 2597 | /* Don't export sysctls to unprivileged users */ |
| 2598 | if (net->user_ns != &init_user_ns) |
| 2599 | tbl[0].procname = NULL; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2600 | } |
| 2601 | tbl[0].extra1 = net; |
| 2602 | |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 2603 | 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] | 2604 | if (net->ipv4.route_hdr == NULL) |
| 2605 | goto err_reg; |
| 2606 | return 0; |
| 2607 | |
| 2608 | err_reg: |
| 2609 | if (tbl != ipv4_route_flush_table) |
| 2610 | kfree(tbl); |
| 2611 | err_dup: |
| 2612 | return -ENOMEM; |
| 2613 | } |
| 2614 | |
| 2615 | static __net_exit void sysctl_route_net_exit(struct net *net) |
| 2616 | { |
| 2617 | struct ctl_table *tbl; |
| 2618 | |
| 2619 | tbl = net->ipv4.route_hdr->ctl_table_arg; |
| 2620 | unregister_net_sysctl_table(net->ipv4.route_hdr); |
| 2621 | BUG_ON(tbl == ipv4_route_flush_table); |
| 2622 | kfree(tbl); |
| 2623 | } |
| 2624 | |
| 2625 | static __net_initdata struct pernet_operations sysctl_route_ops = { |
| 2626 | .init = sysctl_route_net_init, |
| 2627 | .exit = sysctl_route_net_exit, |
| 2628 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | #endif |
| 2630 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2631 | static __net_init int rt_genid_init(struct net *net) |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2632 | { |
Nicolas Dichtel | b42664f | 2012-09-10 22:09:44 +0000 | [diff] [blame] | 2633 | atomic_set(&net->rt_genid, 0); |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 2634 | atomic_set(&net->fnhe_genid, 0); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 2635 | get_random_bytes(&net->ipv4.dev_addr_genid, |
| 2636 | sizeof(net->ipv4.dev_addr_genid)); |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2637 | return 0; |
| 2638 | } |
| 2639 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2640 | static __net_initdata struct pernet_operations rt_genid_ops = { |
| 2641 | .init = rt_genid_init, |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2642 | }; |
| 2643 | |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2644 | static int __net_init ipv4_inetpeer_init(struct net *net) |
| 2645 | { |
| 2646 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); |
| 2647 | |
| 2648 | if (!bp) |
| 2649 | return -ENOMEM; |
| 2650 | inet_peer_base_init(bp); |
| 2651 | net->ipv4.peers = bp; |
| 2652 | return 0; |
| 2653 | } |
| 2654 | |
| 2655 | static void __net_exit ipv4_inetpeer_exit(struct net *net) |
| 2656 | { |
| 2657 | struct inet_peer_base *bp = net->ipv4.peers; |
| 2658 | |
| 2659 | net->ipv4.peers = NULL; |
David S. Miller | 56a6b24 | 2012-06-09 16:32:41 -0700 | [diff] [blame] | 2660 | inetpeer_invalidate_tree(bp); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2661 | kfree(bp); |
| 2662 | } |
| 2663 | |
| 2664 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { |
| 2665 | .init = ipv4_inetpeer_init, |
| 2666 | .exit = ipv4_inetpeer_exit, |
| 2667 | }; |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2668 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2669 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Tejun Heo | 7d720c3 | 2010-02-16 15:20:26 +0000 | [diff] [blame] | 2670 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2671 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | int __init ip_rt_init(void) |
| 2674 | { |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 2675 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2676 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2677 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Ingo Molnar | 0dcec8c | 2009-02-25 14:07:33 +0100 | [diff] [blame] | 2678 | 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] | 2679 | if (!ip_rt_acct) |
| 2680 | panic("IP: failed to allocate ip_rt_acct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | #endif |
| 2682 | |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 2683 | ipv4_dst_ops.kmem_cachep = |
| 2684 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2685 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2687 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
| 2688 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 2689 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
| 2690 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); |
| 2691 | |
| 2692 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) |
| 2693 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); |
| 2694 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 2695 | ipv4_dst_ops.gc_thresh = ~0; |
| 2696 | ip_rt_max_size = INT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2698 | devinet_init(); |
| 2699 | ip_fib_init(); |
| 2700 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 2701 | if (ip_rt_proc_init()) |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 2702 | pr_err("Unable to create route proc files\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2703 | #ifdef CONFIG_XFRM |
| 2704 | xfrm_init(); |
Steffen Klassert | 703fb94 | 2012-11-13 08:52:24 +0100 | [diff] [blame] | 2705 | xfrm4_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | #endif |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2707 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 2708 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2709 | #ifdef CONFIG_SYSCTL |
| 2710 | register_pernet_subsys(&sysctl_route_ops); |
| 2711 | #endif |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2712 | register_pernet_subsys(&rt_genid_ops); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2713 | register_pernet_subsys(&ipv4_inetpeer_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2714 | return rc; |
| 2715 | } |
| 2716 | |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 2717 | #ifdef CONFIG_SYSCTL |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 2718 | /* |
| 2719 | * We really need to sanitize the damn ipv4 init order, then all |
| 2720 | * this nonsense will go away. |
| 2721 | */ |
| 2722 | void __init ip_static_sysctl_init(void) |
| 2723 | { |
Eric W. Biederman | 4e5ca78 | 2012-04-19 13:32:39 +0000 | [diff] [blame] | 2724 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 2725 | } |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 2726 | #endif |