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> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 68 | #include <linux/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> |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 92 | #include <linux/jhash.h> |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 93 | #include <net/dst.h> |
Thomas Graf | 1b7179d | 2015-07-21 10:43:59 +0200 | [diff] [blame] | 94 | #include <net/dst_metadata.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 95 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #include <net/protocol.h> |
| 97 | #include <net/ip.h> |
| 98 | #include <net/route.h> |
| 99 | #include <net/inetpeer.h> |
| 100 | #include <net/sock.h> |
| 101 | #include <net/ip_fib.h> |
| 102 | #include <net/arp.h> |
| 103 | #include <net/tcp.h> |
| 104 | #include <net/icmp.h> |
| 105 | #include <net/xfrm.h> |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 106 | #include <net/lwtunnel.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 107 | #include <net/netevent.h> |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 108 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #ifdef CONFIG_SYSCTL |
| 110 | #include <linux/sysctl.h> |
Shan Wei | 7426a56 | 2012-04-18 18:05:46 +0000 | [diff] [blame] | 111 | #include <linux/kmemleak.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | #endif |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 113 | #include <net/secure_seq.h> |
Thomas Graf | 1b7179d | 2015-07-21 10:43:59 +0200 | [diff] [blame] | 114 | #include <net/ip_tunnels.h> |
David Ahern | 385add9 | 2015-09-29 20:07:13 -0700 | [diff] [blame] | 115 | #include <net/l3mdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 117 | #define RT_FL_TOS(oldflp4) \ |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 118 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | #define RT_GC_TIMEOUT (300*HZ) |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static int ip_rt_max_size; |
Stephen Hemminger | 817bc4d | 2008-03-22 17:43:59 -0700 | [diff] [blame] | 123 | static int ip_rt_redirect_number __read_mostly = 9; |
| 124 | static int ip_rt_redirect_load __read_mostly = HZ / 50; |
| 125 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); |
| 126 | static int ip_rt_error_cost __read_mostly = HZ; |
| 127 | static int ip_rt_error_burst __read_mostly = 5 * HZ; |
Stephen Hemminger | 817bc4d | 2008-03-22 17:43:59 -0700 | [diff] [blame] | 128 | static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ; |
| 129 | static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20; |
| 130 | static int ip_rt_min_advmss __read_mostly = 256; |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 131 | |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 132 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * Interface to generic destination cache. |
| 135 | */ |
| 136 | |
| 137 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 138 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 139 | static unsigned int ipv4_mtu(const struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
| 141 | static void ipv4_link_failure(struct sk_buff *skb); |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 142 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 143 | struct sk_buff *skb, u32 mtu); |
| 144 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, |
| 145 | struct sk_buff *skb); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 146 | static void ipv4_dst_destroy(struct dst_entry *dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 148 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
| 149 | { |
David S. Miller | 3124873 | 2012-07-10 07:08:18 -0700 | [diff] [blame] | 150 | WARN_ON(1); |
| 151 | return NULL; |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 152 | } |
| 153 | |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 154 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
| 155 | struct sk_buff *skb, |
| 156 | const void *daddr); |
Julian Anastasov | 63fca65 | 2017-02-06 23:14:15 +0200 | [diff] [blame] | 157 | static void ipv4_confirm_neigh(const struct dst_entry *dst, 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, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | .check = ipv4_dst_check, |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 162 | .default_advmss = ipv4_default_advmss, |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 163 | .mtu = ipv4_mtu, |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 164 | .cow_metrics = ipv4_cow_metrics, |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 165 | .destroy = ipv4_dst_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | .negative_advice = ipv4_negative_advice, |
| 167 | .link_failure = ipv4_link_failure, |
| 168 | .update_pmtu = ip_rt_update_pmtu, |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 169 | .redirect = ip_do_redirect, |
Eric W. Biederman | b92dacd | 2015-10-07 16:48:37 -0500 | [diff] [blame] | 170 | .local_out = __ip_local_out, |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 171 | .neigh_lookup = ipv4_neigh_lookup, |
Julian Anastasov | 63fca65 | 2017-02-06 23:14:15 +0200 | [diff] [blame] | 172 | .confirm_neigh = ipv4_confirm_neigh, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | }; |
| 174 | |
| 175 | #define ECN_OR_COST(class) TC_PRIO_##class |
| 176 | |
Philippe De Muyter | 4839c52 | 2007-07-09 15:32:57 -0700 | [diff] [blame] | 177 | const __u8 ip_tos2prio[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | TC_PRIO_BESTEFFORT, |
Dan Siemon | 4a2b9c3 | 2011-03-15 13:56:07 +0000 | [diff] [blame] | 179 | ECN_OR_COST(BESTEFFORT), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | TC_PRIO_BESTEFFORT, |
| 181 | ECN_OR_COST(BESTEFFORT), |
| 182 | TC_PRIO_BULK, |
| 183 | ECN_OR_COST(BULK), |
| 184 | TC_PRIO_BULK, |
| 185 | ECN_OR_COST(BULK), |
| 186 | TC_PRIO_INTERACTIVE, |
| 187 | ECN_OR_COST(INTERACTIVE), |
| 188 | TC_PRIO_INTERACTIVE, |
| 189 | ECN_OR_COST(INTERACTIVE), |
| 190 | TC_PRIO_INTERACTIVE_BULK, |
| 191 | ECN_OR_COST(INTERACTIVE_BULK), |
| 192 | TC_PRIO_INTERACTIVE_BULK, |
| 193 | ECN_OR_COST(INTERACTIVE_BULK) |
| 194 | }; |
Amir Vadai | d4a9686 | 2012-04-04 21:33:28 +0000 | [diff] [blame] | 195 | EXPORT_SYMBOL(ip_tos2prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 197 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
Christoph Lameter | 3ed66e9 | 2014-04-07 15:39:40 -0700 | [diff] [blame] | 198 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
| 202 | { |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 203 | if (*pos) |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 204 | return NULL; |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 205 | return SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 209 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | ++*pos; |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 211 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) |
| 215 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | static int rt_cache_seq_show(struct seq_file *seq, void *v) |
| 219 | { |
| 220 | if (v == SEQ_START_TOKEN) |
| 221 | seq_printf(seq, "%-127s\n", |
| 222 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" |
| 223 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" |
| 224 | "HHUptod\tSpecDst"); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 225 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 228 | static const struct seq_operations rt_cache_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | .start = rt_cache_seq_start, |
| 230 | .next = rt_cache_seq_next, |
| 231 | .stop = rt_cache_seq_stop, |
| 232 | .show = rt_cache_seq_show, |
| 233 | }; |
| 234 | |
| 235 | static int rt_cache_seq_open(struct inode *inode, struct file *file) |
| 236 | { |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 237 | return seq_open(file, &rt_cache_seq_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 240 | static const struct file_operations rt_cache_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | .owner = THIS_MODULE, |
| 242 | .open = rt_cache_seq_open, |
| 243 | .read = seq_read, |
| 244 | .llseek = seq_lseek, |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 245 | .release = seq_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | }; |
| 247 | |
| 248 | |
| 249 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
| 250 | { |
| 251 | int cpu; |
| 252 | |
| 253 | if (*pos == 0) |
| 254 | return SEQ_START_TOKEN; |
| 255 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 256 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | if (!cpu_possible(cpu)) |
| 258 | continue; |
| 259 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 260 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
| 262 | return NULL; |
| 263 | } |
| 264 | |
| 265 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 266 | { |
| 267 | int cpu; |
| 268 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 269 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | if (!cpu_possible(cpu)) |
| 271 | continue; |
| 272 | *pos = cpu+1; |
Eric Dumazet | 2f970d8 | 2006-01-17 02:54:36 -0800 | [diff] [blame] | 273 | return &per_cpu(rt_cache_stat, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | } |
| 275 | return NULL; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) |
| 280 | { |
| 281 | |
| 282 | } |
| 283 | |
| 284 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) |
| 285 | { |
| 286 | struct rt_cache_stat *st = v; |
| 287 | |
| 288 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 289 | 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] | 290 | return 0; |
| 291 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | seq_printf(seq,"%08x %08x %08x %08x %08x %08x %08x %08x " |
| 294 | " %08x %08x %08x %08x %08x %08x %08x %08x %08x \n", |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 295 | dst_entries_get_slow(&ipv4_dst_ops), |
Eric Dumazet | 0baf2b3 | 2013-10-16 02:49:04 -0700 | [diff] [blame] | 296 | 0, /* st->in_hit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | st->in_slow_tot, |
| 298 | st->in_slow_mc, |
| 299 | st->in_no_route, |
| 300 | st->in_brd, |
| 301 | st->in_martian_dst, |
| 302 | st->in_martian_src, |
| 303 | |
Eric Dumazet | 0baf2b3 | 2013-10-16 02:49:04 -0700 | [diff] [blame] | 304 | 0, /* st->out_hit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | st->out_slow_tot, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 306 | st->out_slow_mc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Eric Dumazet | 0baf2b3 | 2013-10-16 02:49:04 -0700 | [diff] [blame] | 308 | 0, /* st->gc_total */ |
| 309 | 0, /* st->gc_ignored */ |
| 310 | 0, /* st->gc_goal_miss */ |
| 311 | 0, /* st->gc_dst_overflow */ |
| 312 | 0, /* st->in_hlist_search */ |
| 313 | 0 /* st->out_hlist_search */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | ); |
| 315 | return 0; |
| 316 | } |
| 317 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 318 | static const struct seq_operations rt_cpu_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | .start = rt_cpu_seq_start, |
| 320 | .next = rt_cpu_seq_next, |
| 321 | .stop = rt_cpu_seq_stop, |
| 322 | .show = rt_cpu_seq_show, |
| 323 | }; |
| 324 | |
| 325 | |
| 326 | static int rt_cpu_seq_open(struct inode *inode, struct file *file) |
| 327 | { |
| 328 | return seq_open(file, &rt_cpu_seq_ops); |
| 329 | } |
| 330 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 331 | static const struct file_operations rt_cpu_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | .owner = THIS_MODULE, |
| 333 | .open = rt_cpu_seq_open, |
| 334 | .read = seq_read, |
| 335 | .llseek = seq_lseek, |
| 336 | .release = seq_release, |
| 337 | }; |
| 338 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 339 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 340 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 341 | { |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 342 | struct ip_rt_acct *dst, *src; |
| 343 | unsigned int i, j; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 344 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 345 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); |
| 346 | if (!dst) |
| 347 | return -ENOMEM; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 348 | |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 349 | for_each_possible_cpu(i) { |
| 350 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); |
| 351 | for (j = 0; j < 256; j++) { |
| 352 | dst[j].o_bytes += src[j].o_bytes; |
| 353 | dst[j].o_packets += src[j].o_packets; |
| 354 | dst[j].i_bytes += src[j].i_bytes; |
| 355 | dst[j].i_packets += src[j].i_packets; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 356 | } |
| 357 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 358 | |
| 359 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
| 360 | kfree(dst); |
| 361 | return 0; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 362 | } |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 363 | |
| 364 | static int rt_acct_proc_open(struct inode *inode, struct file *file) |
| 365 | { |
| 366 | return single_open(file, rt_acct_proc_show, NULL); |
| 367 | } |
| 368 | |
| 369 | static const struct file_operations rt_acct_proc_fops = { |
| 370 | .owner = THIS_MODULE, |
| 371 | .open = rt_acct_proc_open, |
| 372 | .read = seq_read, |
| 373 | .llseek = seq_lseek, |
| 374 | .release = single_release, |
| 375 | }; |
Pavel Emelyanov | 78c686e | 2007-12-05 21:13:48 -0800 | [diff] [blame] | 376 | #endif |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 377 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 378 | static int __net_init ip_rt_do_proc_init(struct net *net) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 379 | { |
| 380 | struct proc_dir_entry *pde; |
| 381 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 382 | pde = proc_create("rt_cache", S_IRUGO, net->proc_net, |
| 383 | &rt_cache_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 384 | if (!pde) |
| 385 | goto err1; |
| 386 | |
Wang Chen | 7702072 | 2008-02-28 14:14:25 -0800 | [diff] [blame] | 387 | pde = proc_create("rt_cache", S_IRUGO, |
| 388 | net->proc_net_stat, &rt_cpu_seq_fops); |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 389 | if (!pde) |
| 390 | goto err2; |
| 391 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 392 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Alexey Dobriyan | a661c41 | 2009-11-25 15:40:35 -0800 | [diff] [blame] | 393 | 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] | 394 | if (!pde) |
| 395 | goto err3; |
| 396 | #endif |
| 397 | return 0; |
| 398 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 399 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 400 | err3: |
| 401 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 402 | #endif |
| 403 | err2: |
| 404 | remove_proc_entry("rt_cache", net->proc_net); |
| 405 | err1: |
| 406 | return -ENOMEM; |
| 407 | } |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 408 | |
| 409 | static void __net_exit ip_rt_do_proc_exit(struct net *net) |
| 410 | { |
| 411 | remove_proc_entry("rt_cache", net->proc_net_stat); |
| 412 | remove_proc_entry("rt_cache", net->proc_net); |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 413 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 414 | remove_proc_entry("rt_acct", net->proc_net); |
Alexey Dobriyan | 0a931ac | 2010-01-17 03:32:50 +0000 | [diff] [blame] | 415 | #endif |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { |
| 419 | .init = ip_rt_do_proc_init, |
| 420 | .exit = ip_rt_do_proc_exit, |
| 421 | }; |
| 422 | |
| 423 | static int __init ip_rt_proc_init(void) |
| 424 | { |
| 425 | return register_pernet_subsys(&ip_rt_proc_ops); |
| 426 | } |
| 427 | |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 428 | #else |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 429 | static inline int ip_rt_proc_init(void) |
Pavel Emelyanov | 107f163 | 2007-12-05 21:14:28 -0800 | [diff] [blame] | 430 | { |
| 431 | return 0; |
| 432 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | #endif /* CONFIG_PROC_FS */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 434 | |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 435 | static inline bool rt_is_expired(const struct rtable *rth) |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 436 | { |
fan.du | ca4c3fc | 2013-07-30 08:33:53 +0800 | [diff] [blame] | 437 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
Denis V. Lunev | e84f84f | 2008-07-05 19:04:32 -0700 | [diff] [blame] | 438 | } |
| 439 | |
Nicolas Dichtel | 4ccfe6d | 2012-09-07 00:45:29 +0000 | [diff] [blame] | 440 | void rt_cache_flush(struct net *net) |
Eric Dumazet | 29e7525 | 2008-01-31 17:05:09 -0800 | [diff] [blame] | 441 | { |
fan.du | ca4c3fc | 2013-07-30 08:33:53 +0800 | [diff] [blame] | 442 | rt_genid_bump_ipv4(net); |
Eric Dumazet | 9837638 | 2010-03-08 03:20:00 +0000 | [diff] [blame] | 443 | } |
| 444 | |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 445 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
| 446 | struct sk_buff *skb, |
| 447 | const void *daddr) |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 448 | { |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 449 | struct net_device *dev = dst->dev; |
| 450 | const __be32 *pkey = daddr; |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 451 | const struct rtable *rt; |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 452 | struct neighbour *n; |
| 453 | |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 454 | rt = (const struct rtable *) dst; |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 455 | if (rt->rt_gateway) |
David S. Miller | 3923297 | 2012-01-26 15:22:32 -0500 | [diff] [blame] | 456 | pkey = (const __be32 *) &rt->rt_gateway; |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 457 | else if (skb) |
| 458 | pkey = &ip_hdr(skb)->daddr; |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 459 | |
David S. Miller | 80703d2 | 2012-02-15 17:48:35 -0500 | [diff] [blame] | 460 | n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 461 | if (n) |
| 462 | return n; |
David Miller | 32092ec | 2011-07-25 00:01:41 +0000 | [diff] [blame] | 463 | return neigh_create(&arp_tbl, pkey, dev); |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 464 | } |
| 465 | |
Julian Anastasov | 63fca65 | 2017-02-06 23:14:15 +0200 | [diff] [blame] | 466 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
| 467 | { |
| 468 | struct net_device *dev = dst->dev; |
| 469 | const __be32 *pkey = daddr; |
| 470 | const struct rtable *rt; |
| 471 | |
| 472 | rt = (const struct rtable *)dst; |
| 473 | if (rt->rt_gateway) |
| 474 | pkey = (const __be32 *)&rt->rt_gateway; |
| 475 | else if (!daddr || |
| 476 | (rt->rt_flags & |
| 477 | (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL))) |
| 478 | return; |
| 479 | |
| 480 | __ipv4_confirm_neigh(dev, *(__force u32 *)pkey); |
| 481 | } |
| 482 | |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 483 | #define IP_IDENTS_SZ 2048u |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 484 | |
Eric Dumazet | 355b590 | 2015-05-01 10:37:49 -0700 | [diff] [blame] | 485 | static atomic_t *ip_idents __read_mostly; |
| 486 | static u32 *ip_tstamps __read_mostly; |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 487 | |
| 488 | /* In order to protect privacy, we add a perturbation to identifiers |
| 489 | * if one generator is seldom used. This makes hard for an attacker |
| 490 | * to infer how many packets were sent between two points in time. |
| 491 | */ |
| 492 | u32 ip_idents_reserve(u32 hash, int segs) |
| 493 | { |
Eric Dumazet | 355b590 | 2015-05-01 10:37:49 -0700 | [diff] [blame] | 494 | u32 *p_tstamp = ip_tstamps + hash % IP_IDENTS_SZ; |
| 495 | atomic_t *p_id = ip_idents + hash % IP_IDENTS_SZ; |
| 496 | u32 old = ACCESS_ONCE(*p_tstamp); |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 497 | u32 now = (u32)jiffies; |
Eric Dumazet | adb0311 | 2016-09-20 18:06:17 -0700 | [diff] [blame] | 498 | u32 new, delta = 0; |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 499 | |
Eric Dumazet | 355b590 | 2015-05-01 10:37:49 -0700 | [diff] [blame] | 500 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 501 | delta = prandom_u32_max(now - old); |
| 502 | |
Eric Dumazet | adb0311 | 2016-09-20 18:06:17 -0700 | [diff] [blame] | 503 | /* Do not use atomic_add_return() as it makes UBSAN unhappy */ |
| 504 | do { |
| 505 | old = (u32)atomic_read(p_id); |
| 506 | new = old + delta + segs; |
| 507 | } while (atomic_cmpxchg(p_id, old, new) != old); |
| 508 | |
| 509 | return new - segs; |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 510 | } |
| 511 | EXPORT_SYMBOL(ip_idents_reserve); |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 512 | |
Hannes Frederic Sowa | b6a7719 | 2015-03-25 17:07:44 +0100 | [diff] [blame] | 513 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 515 | static u32 ip_idents_hashrnd __read_mostly; |
| 516 | u32 hash, id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 518 | net_get_random_once(&ip_idents_hashrnd, sizeof(ip_idents_hashrnd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 520 | hash = jhash_3words((__force u32)iph->daddr, |
| 521 | (__force u32)iph->saddr, |
Hannes Frederic Sowa | b6a7719 | 2015-03-25 17:07:44 +0100 | [diff] [blame] | 522 | iph->protocol ^ net_hash_mix(net), |
Eric Dumazet | 04ca697 | 2014-07-26 08:58:10 +0200 | [diff] [blame] | 523 | ip_idents_hashrnd); |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 524 | id = ip_idents_reserve(hash, segs); |
| 525 | iph->id = htons(id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 527 | EXPORT_SYMBOL(__ip_select_ident); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 529 | static void __build_flow_key(const struct net *net, struct flowi4 *fl4, |
| 530 | const struct sock *sk, |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 531 | const struct iphdr *iph, |
| 532 | int oif, u8 tos, |
| 533 | u8 prot, u32 mark, int flow_flags) |
| 534 | { |
| 535 | if (sk) { |
| 536 | const struct inet_sock *inet = inet_sk(sk); |
| 537 | |
| 538 | oif = sk->sk_bound_dev_if; |
| 539 | mark = sk->sk_mark; |
| 540 | tos = RT_CONN_FLAGS(sk); |
| 541 | prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol; |
| 542 | } |
| 543 | flowi4_init_output(fl4, oif, mark, tos, |
| 544 | RT_SCOPE_UNIVERSE, prot, |
| 545 | flow_flags, |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 546 | iph->daddr, iph->saddr, 0, 0, |
| 547 | sock_net_uid(net, sk)); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 548 | } |
| 549 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 550 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
| 551 | const struct sock *sk) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 552 | { |
Lorenzo Colitti | d109e61 | 2016-11-30 02:56:47 +0900 | [diff] [blame] | 553 | const struct net *net = dev_net(skb->dev); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 554 | const struct iphdr *iph = ip_hdr(skb); |
| 555 | int oif = skb->dev->ifindex; |
| 556 | u8 tos = RT_TOS(iph->tos); |
| 557 | u8 prot = iph->protocol; |
| 558 | u32 mark = skb->mark; |
| 559 | |
Lorenzo Colitti | d109e61 | 2016-11-30 02:56:47 +0900 | [diff] [blame] | 560 | __build_flow_key(net, fl4, sk, iph, oif, tos, prot, mark, 0); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 561 | } |
| 562 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 563 | 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] | 564 | { |
| 565 | const struct inet_sock *inet = inet_sk(sk); |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 566 | const struct ip_options_rcu *inet_opt; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 567 | __be32 daddr = inet->inet_daddr; |
| 568 | |
| 569 | rcu_read_lock(); |
| 570 | inet_opt = rcu_dereference(inet->inet_opt); |
| 571 | if (inet_opt && inet_opt->opt.srr) |
| 572 | daddr = inet_opt->opt.faddr; |
| 573 | flowi4_init_output(fl4, sk->sk_bound_dev_if, sk->sk_mark, |
| 574 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
| 575 | inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, |
| 576 | inet_sk_flowi_flags(sk), |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 577 | daddr, inet->inet_saddr, 0, 0, sk->sk_uid); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 578 | rcu_read_unlock(); |
| 579 | } |
| 580 | |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 581 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
| 582 | const struct sk_buff *skb) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 583 | { |
| 584 | if (skb) |
| 585 | build_skb_flow_key(fl4, skb, sk); |
| 586 | else |
| 587 | build_sk_flow_key(fl4, sk); |
| 588 | } |
| 589 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 590 | static inline void rt_free(struct rtable *rt) |
| 591 | { |
| 592 | call_rcu(&rt->dst.rcu_head, dst_rcu_free); |
| 593 | } |
| 594 | |
| 595 | static DEFINE_SPINLOCK(fnhe_lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 596 | |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 597 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
| 598 | { |
| 599 | struct rtable *rt; |
| 600 | |
| 601 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
| 602 | if (rt) { |
| 603 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); |
| 604 | rt_free(rt); |
| 605 | } |
| 606 | rt = rcu_dereference(fnhe->fnhe_rth_output); |
| 607 | if (rt) { |
| 608 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); |
| 609 | rt_free(rt); |
| 610 | } |
| 611 | } |
| 612 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 613 | 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] | 614 | { |
| 615 | struct fib_nh_exception *fnhe, *oldest; |
| 616 | |
| 617 | oldest = rcu_dereference(hash->chain); |
| 618 | for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe; |
| 619 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
| 620 | if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) |
| 621 | oldest = fnhe; |
| 622 | } |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 623 | fnhe_flush_routes(oldest); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 624 | return oldest; |
| 625 | } |
| 626 | |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 627 | static inline u32 fnhe_hashfun(__be32 daddr) |
| 628 | { |
Eric Dumazet | d546c62 | 2014-09-04 08:21:31 -0700 | [diff] [blame] | 629 | static u32 fnhe_hashrnd __read_mostly; |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 630 | u32 hval; |
| 631 | |
Eric Dumazet | d546c62 | 2014-09-04 08:21:31 -0700 | [diff] [blame] | 632 | net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); |
| 633 | hval = jhash_1word((__force u32) daddr, fnhe_hashrnd); |
| 634 | return hash_32(hval, FNHE_HASH_SHIFT); |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 635 | } |
| 636 | |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 637 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
| 638 | { |
| 639 | rt->rt_pmtu = fnhe->fnhe_pmtu; |
| 640 | rt->dst.expires = fnhe->fnhe_expires; |
| 641 | |
| 642 | if (fnhe->fnhe_gw) { |
| 643 | rt->rt_flags |= RTCF_REDIRECTED; |
| 644 | rt->rt_gateway = fnhe->fnhe_gw; |
| 645 | rt->rt_uses_gateway = 1; |
| 646 | } |
| 647 | } |
| 648 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 649 | static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw, |
| 650 | u32 pmtu, unsigned long expires) |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 651 | { |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 652 | struct fnhe_hash_bucket *hash; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 653 | struct fib_nh_exception *fnhe; |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 654 | struct rtable *rt; |
| 655 | unsigned int i; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 656 | int depth; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 657 | u32 hval = fnhe_hashfun(daddr); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 658 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 659 | spin_lock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 660 | |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 661 | hash = rcu_dereference(nh->nh_exceptions); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 662 | if (!hash) { |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 663 | hash = kzalloc(FNHE_HASH_SIZE * sizeof(*hash), GFP_ATOMIC); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 664 | if (!hash) |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 665 | goto out_unlock; |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 666 | rcu_assign_pointer(nh->nh_exceptions, hash); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 667 | } |
| 668 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 669 | hash += hval; |
| 670 | |
| 671 | depth = 0; |
| 672 | for (fnhe = rcu_dereference(hash->chain); fnhe; |
| 673 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
| 674 | if (fnhe->fnhe_daddr == daddr) |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 675 | break; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 676 | depth++; |
| 677 | } |
| 678 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 679 | if (fnhe) { |
| 680 | if (gw) |
| 681 | fnhe->fnhe_gw = gw; |
| 682 | if (pmtu) { |
| 683 | fnhe->fnhe_pmtu = pmtu; |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 684 | fnhe->fnhe_expires = max(1UL, expires); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 685 | } |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 686 | /* Update all cached dsts too */ |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 687 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
| 688 | if (rt) |
| 689 | fill_route_from_fnhe(rt, fnhe); |
| 690 | rt = rcu_dereference(fnhe->fnhe_rth_output); |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 691 | if (rt) |
| 692 | fill_route_from_fnhe(rt, fnhe); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 693 | } else { |
| 694 | if (depth > FNHE_RECLAIM_DEPTH) |
| 695 | fnhe = fnhe_oldest(hash); |
| 696 | else { |
| 697 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); |
| 698 | if (!fnhe) |
| 699 | goto out_unlock; |
| 700 | |
| 701 | fnhe->fnhe_next = hash->chain; |
| 702 | rcu_assign_pointer(hash->chain, fnhe); |
| 703 | } |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 704 | fnhe->fnhe_genid = fnhe_genid(dev_net(nh->nh_dev)); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 705 | fnhe->fnhe_daddr = daddr; |
| 706 | fnhe->fnhe_gw = gw; |
| 707 | fnhe->fnhe_pmtu = pmtu; |
| 708 | fnhe->fnhe_expires = expires; |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 709 | |
| 710 | /* Exception created; mark the cached routes for the nexthop |
| 711 | * stale, so anyone caching it rechecks if this exception |
| 712 | * applies to them. |
| 713 | */ |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 714 | rt = rcu_dereference(nh->nh_rth_input); |
| 715 | if (rt) |
| 716 | rt->dst.obsolete = DST_OBSOLETE_KILL; |
| 717 | |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 718 | for_each_possible_cpu(i) { |
| 719 | struct rtable __rcu **prt; |
| 720 | prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i); |
| 721 | rt = rcu_dereference(*prt); |
| 722 | if (rt) |
| 723 | rt->dst.obsolete = DST_OBSOLETE_KILL; |
| 724 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 725 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 726 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 727 | fnhe->fnhe_stamp = jiffies; |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 728 | |
| 729 | out_unlock: |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 730 | spin_unlock_bh(&fnhe_lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 731 | } |
| 732 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 733 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
| 734 | bool kill_route) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 736 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
David S. Miller | 9420612 | 2012-07-11 20:38:08 -0700 | [diff] [blame] | 737 | __be32 old_gw = ip_hdr(skb)->saddr; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 738 | struct net_device *dev = skb->dev; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 739 | struct in_device *in_dev; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 740 | struct fib_result res; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 741 | struct neighbour *n; |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 742 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
David S. Miller | 9420612 | 2012-07-11 20:38:08 -0700 | [diff] [blame] | 744 | switch (icmp_hdr(skb)->code & 7) { |
| 745 | case ICMP_REDIR_NET: |
| 746 | case ICMP_REDIR_NETTOS: |
| 747 | case ICMP_REDIR_HOST: |
| 748 | case ICMP_REDIR_HOSTTOS: |
| 749 | break; |
| 750 | |
| 751 | default: |
| 752 | return; |
| 753 | } |
| 754 | |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 755 | if (rt->rt_gateway != old_gw) |
| 756 | return; |
| 757 | |
| 758 | in_dev = __in_dev_get_rcu(dev); |
| 759 | if (!in_dev) |
| 760 | return; |
| 761 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 762 | net = dev_net(dev); |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 763 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
| 764 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || |
| 765 | ipv4_is_zeronet(new_gw)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | goto reject_redirect; |
| 767 | |
| 768 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { |
| 769 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) |
| 770 | goto reject_redirect; |
| 771 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) |
| 772 | goto reject_redirect; |
| 773 | } else { |
Denis V. Lunev | 317805b | 2008-02-28 20:50:06 -0800 | [diff] [blame] | 774 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | goto reject_redirect; |
| 776 | } |
| 777 | |
Stephen Suryaputra Lin | 969447f | 2016-11-10 11:16:15 -0500 | [diff] [blame] | 778 | n = __ipv4_neigh_lookup(rt->dst.dev, new_gw); |
| 779 | if (!n) |
| 780 | n = neigh_create(&arp_tbl, &new_gw, rt->dst.dev); |
WANG Cong | 2c1a431 | 2014-09-24 17:07:53 -0700 | [diff] [blame] | 781 | if (!IS_ERR(n)) { |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 782 | if (!(n->nud_state & NUD_VALID)) { |
| 783 | neigh_event_send(n, NULL); |
| 784 | } else { |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 785 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 786 | struct fib_nh *nh = &FIB_RES_NH(res); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 787 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 788 | update_or_create_fnhe(nh, fl4->daddr, new_gw, |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 789 | 0, jiffies + ip_rt_gc_timeout); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 790 | } |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 791 | if (kill_route) |
| 792 | rt->dst.obsolete = DST_OBSOLETE_KILL; |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 793 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
| 794 | } |
| 795 | neigh_release(n); |
| 796 | } |
| 797 | return; |
| 798 | |
| 799 | reject_redirect: |
| 800 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
David S. Miller | 99ee038 | 2012-07-12 07:40:05 -0700 | [diff] [blame] | 801 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
| 802 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 803 | __be32 daddr = iph->daddr; |
| 804 | __be32 saddr = iph->saddr; |
| 805 | |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 806 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
| 807 | " Advised path = %pI4 -> %pI4\n", |
| 808 | &old_gw, dev->name, &new_gw, |
| 809 | &saddr, &daddr); |
David S. Miller | 99ee038 | 2012-07-12 07:40:05 -0700 | [diff] [blame] | 810 | } |
David S. Miller | e47a185 | 2012-07-11 20:55:47 -0700 | [diff] [blame] | 811 | #endif |
| 812 | ; |
| 813 | } |
| 814 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 815 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
| 816 | { |
| 817 | struct rtable *rt; |
| 818 | struct flowi4 fl4; |
Michal Kubecek | f96ef98 | 2013-05-28 08:26:49 +0200 | [diff] [blame] | 819 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
Lorenzo Colitti | 7d99569 | 2016-12-23 00:33:57 +0900 | [diff] [blame] | 820 | struct net *net = dev_net(skb->dev); |
Michal Kubecek | f96ef98 | 2013-05-28 08:26:49 +0200 | [diff] [blame] | 821 | int oif = skb->dev->ifindex; |
| 822 | u8 tos = RT_TOS(iph->tos); |
| 823 | u8 prot = iph->protocol; |
| 824 | u32 mark = skb->mark; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 825 | |
| 826 | rt = (struct rtable *) dst; |
| 827 | |
Lorenzo Colitti | 7d99569 | 2016-12-23 00:33:57 +0900 | [diff] [blame] | 828 | __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0); |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 829 | __ip_do_redirect(rt, skb, &fl4, true); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 830 | } |
| 831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
| 833 | { |
Eric Dumazet | ee6b967 | 2008-03-05 18:30:47 -0800 | [diff] [blame] | 834 | struct rtable *rt = (struct rtable *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | struct dst_entry *ret = dst; |
| 836 | |
| 837 | if (rt) { |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 838 | if (dst->obsolete > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | ip_rt_put(rt); |
| 840 | ret = NULL; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 841 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
| 842 | rt->dst.expires) { |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 843 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | ret = NULL; |
| 845 | } |
| 846 | } |
| 847 | return ret; |
| 848 | } |
| 849 | |
| 850 | /* |
| 851 | * Algorithm: |
| 852 | * 1. The first ip_rt_redirect_number redirects are sent |
| 853 | * with exponential backoff, then we stop sending them at all, |
| 854 | * assuming that the host ignores our redirects. |
| 855 | * 2. If we did not see packets requiring redirects |
| 856 | * during ip_rt_redirect_silence, we assume that the host |
| 857 | * forgot redirected route and start to send redirects again. |
| 858 | * |
| 859 | * This algorithm is much cheaper and more intelligent than dumb load limiting |
| 860 | * in icmp.c. |
| 861 | * |
| 862 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) |
| 863 | * and "frag. need" (breaks PMTU discovery) in icmp.c. |
| 864 | */ |
| 865 | |
| 866 | void ip_rt_send_redirect(struct sk_buff *skb) |
| 867 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 868 | struct rtable *rt = skb_rtable(skb); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 869 | struct in_device *in_dev; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 870 | struct inet_peer *peer; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 871 | struct net *net; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 872 | int log_martians; |
David Ahern | 192132b | 2015-08-27 16:07:03 -0700 | [diff] [blame] | 873 | int vif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 875 | rcu_read_lock(); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 876 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 877 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
| 878 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | return; |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 880 | } |
| 881 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); |
David Ahern | 385add9 | 2015-09-29 20:07:13 -0700 | [diff] [blame] | 882 | vif = l3mdev_master_ifindex_rcu(rt->dst.dev); |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 883 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 885 | net = dev_net(rt->dst.dev); |
David Ahern | 192132b | 2015-08-27 16:07:03 -0700 | [diff] [blame] | 886 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 887 | if (!peer) { |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 888 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
| 889 | rt_nexthop(rt, ip_hdr(skb)->daddr)); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 890 | return; |
| 891 | } |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | /* No redirected packets during ip_rt_redirect_silence; |
| 894 | * reset the algorithm. |
| 895 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 896 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) |
| 897 | peer->rate_tokens = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
| 899 | /* Too many ignored redirects; do not send anything |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 900 | * set dst.rate_last to the last seen redirected packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 902 | if (peer->rate_tokens >= ip_rt_redirect_number) { |
| 903 | peer->rate_last = jiffies; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 904 | goto out_put_peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | /* Check for load limit; set rate_last to the latest sent |
| 908 | * redirect. |
| 909 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 910 | if (peer->rate_tokens == 0 || |
Li Yewang | 14fb8a7 | 2006-12-18 00:26:35 -0800 | [diff] [blame] | 911 | time_after(jiffies, |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 912 | (peer->rate_last + |
| 913 | (ip_rt_redirect_load << peer->rate_tokens)))) { |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 914 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
| 915 | |
| 916 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 917 | peer->rate_last = jiffies; |
| 918 | ++peer->rate_tokens; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Eric Dumazet | 30038fc | 2009-08-28 23:52:01 -0700 | [diff] [blame] | 920 | if (log_martians && |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 921 | peer->rate_tokens == ip_rt_redirect_number) |
| 922 | 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] | 923 | &ip_hdr(skb)->saddr, inet_iif(skb), |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 924 | &ip_hdr(skb)->daddr, &gw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | #endif |
| 926 | } |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 927 | out_put_peer: |
| 928 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | static int ip_error(struct sk_buff *skb) |
| 932 | { |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 933 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 934 | struct rtable *rt = skb_rtable(skb); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 935 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | unsigned long now; |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 937 | struct net *net; |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 938 | bool send; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | int code; |
| 940 | |
Eric W. Biederman | 381c759 | 2015-05-22 04:58:12 -0500 | [diff] [blame] | 941 | /* IP on this device is disabled. */ |
| 942 | if (!in_dev) |
| 943 | goto out; |
| 944 | |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 945 | net = dev_net(rt->dst.dev); |
| 946 | if (!IN_DEV_FORWARD(in_dev)) { |
| 947 | switch (rt->dst.error) { |
| 948 | case EHOSTUNREACH: |
Eric Dumazet | b45386e | 2016-04-27 16:44:35 -0700 | [diff] [blame] | 949 | __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS); |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 950 | break; |
| 951 | |
| 952 | case ENETUNREACH: |
Eric Dumazet | b45386e | 2016-04-27 16:44:35 -0700 | [diff] [blame] | 953 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 954 | break; |
| 955 | } |
| 956 | goto out; |
| 957 | } |
| 958 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 959 | switch (rt->dst.error) { |
Joe Perches | 4500ebf | 2011-07-01 09:43:07 +0000 | [diff] [blame] | 960 | case EINVAL: |
| 961 | default: |
| 962 | goto out; |
| 963 | case EHOSTUNREACH: |
| 964 | code = ICMP_HOST_UNREACH; |
| 965 | break; |
| 966 | case ENETUNREACH: |
| 967 | code = ICMP_NET_UNREACH; |
Eric Dumazet | b45386e | 2016-04-27 16:44:35 -0700 | [diff] [blame] | 968 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
Joe Perches | 4500ebf | 2011-07-01 09:43:07 +0000 | [diff] [blame] | 969 | break; |
| 970 | case EACCES: |
| 971 | code = ICMP_PKT_FILTERED; |
| 972 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | } |
| 974 | |
David Ahern | 192132b | 2015-08-27 16:07:03 -0700 | [diff] [blame] | 975 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
David Ahern | 385add9 | 2015-09-29 20:07:13 -0700 | [diff] [blame] | 976 | l3mdev_master_ifindex(skb->dev), 1); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 977 | |
| 978 | send = true; |
| 979 | if (peer) { |
| 980 | now = jiffies; |
| 981 | peer->rate_tokens += now - peer->rate_last; |
| 982 | if (peer->rate_tokens > ip_rt_error_burst) |
| 983 | peer->rate_tokens = ip_rt_error_burst; |
| 984 | peer->rate_last = now; |
| 985 | if (peer->rate_tokens >= ip_rt_error_cost) |
| 986 | peer->rate_tokens -= ip_rt_error_cost; |
| 987 | else |
| 988 | send = false; |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 989 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | } |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 991 | if (send) |
| 992 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
| 994 | out: kfree_skb(skb); |
| 995 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 996 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 998 | 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] | 999 | { |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 1000 | struct dst_entry *dst = &rt->dst; |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1001 | struct fib_result res; |
David S. Miller | 2c8cec5 | 2011-02-09 20:42:07 -0800 | [diff] [blame] | 1002 | |
Steffen Klassert | fa1e492 | 2013-01-16 20:58:10 +0000 | [diff] [blame] | 1003 | if (dst_metric_locked(dst, RTAX_MTU)) |
| 1004 | return; |
| 1005 | |
Herbert Xu | cb6ccf0 | 2015-04-28 11:43:15 +0800 | [diff] [blame] | 1006 | if (ipv4_mtu(dst) < mtu) |
Li Wei | 3cdaa5b | 2015-01-29 16:09:03 +0800 | [diff] [blame] | 1007 | return; |
| 1008 | |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1009 | if (mtu < ip_rt_min_pmtu) |
| 1010 | mtu = ip_rt_min_pmtu; |
Eric Dumazet | fe6fe79 | 2011-06-08 06:07:07 +0000 | [diff] [blame] | 1011 | |
Timo Teräs | f016229 | 2013-05-27 20:46:32 +0000 | [diff] [blame] | 1012 | if (rt->rt_pmtu == mtu && |
| 1013 | time_before(jiffies, dst->expires - ip_rt_mtu_expires / 2)) |
| 1014 | return; |
| 1015 | |
Eric Dumazet | c5ae7d4 | 2012-08-28 12:33:07 +0000 | [diff] [blame] | 1016 | rcu_read_lock(); |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1017 | if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1018 | struct fib_nh *nh = &FIB_RES_NH(res); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1019 | |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 1020 | update_or_create_fnhe(nh, fl4->daddr, 0, mtu, |
| 1021 | jiffies + ip_rt_mtu_expires); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1022 | } |
Eric Dumazet | c5ae7d4 | 2012-08-28 12:33:07 +0000 | [diff] [blame] | 1023 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1026 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 1027 | struct sk_buff *skb, u32 mtu) |
| 1028 | { |
| 1029 | struct rtable *rt = (struct rtable *) dst; |
| 1030 | struct flowi4 fl4; |
| 1031 | |
| 1032 | ip_rt_build_flow_key(&fl4, sk, skb); |
Steffen Klassert | d851c12 | 2012-10-07 22:47:25 +0000 | [diff] [blame] | 1033 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1034 | } |
| 1035 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1036 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
| 1037 | int oif, u32 mark, u8 protocol, int flow_flags) |
| 1038 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1039 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1040 | struct flowi4 fl4; |
| 1041 | struct rtable *rt; |
| 1042 | |
Lorenzo Colitti | 1b3c61d | 2014-05-13 10:17:34 -0700 | [diff] [blame] | 1043 | if (!mark) |
| 1044 | mark = IP4_REPLY_MARK(net, skb->mark); |
| 1045 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1046 | __build_flow_key(net, &fl4, NULL, iph, oif, |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1047 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1048 | rt = __ip_route_output_key(net, &fl4); |
| 1049 | if (!IS_ERR(rt)) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1050 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1051 | ip_rt_put(rt); |
| 1052 | } |
| 1053 | } |
| 1054 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); |
| 1055 | |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1056 | 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] | 1057 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1058 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1059 | struct flowi4 fl4; |
| 1060 | struct rtable *rt; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1061 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1062 | __build_flow_key(sock_net(sk), &fl4, sk, iph, 0, 0, 0, 0, 0); |
Lorenzo Colitti | 1b3c61d | 2014-05-13 10:17:34 -0700 | [diff] [blame] | 1063 | |
| 1064 | if (!fl4.flowi4_mark) |
| 1065 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); |
| 1066 | |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1067 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
| 1068 | if (!IS_ERR(rt)) { |
| 1069 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
| 1070 | ip_rt_put(rt); |
| 1071 | } |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1072 | } |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1073 | |
| 1074 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
| 1075 | { |
| 1076 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1077 | struct flowi4 fl4; |
| 1078 | struct rtable *rt; |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1079 | struct dst_entry *odst = NULL; |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1080 | bool new = false; |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1081 | struct net *net = sock_net(sk); |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1082 | |
| 1083 | bh_lock_sock(sk); |
Hannes Frederic Sowa | 482fc60 | 2013-11-05 02:24:17 +0100 | [diff] [blame] | 1084 | |
| 1085 | if (!ip_sk_accept_pmtu(sk)) |
| 1086 | goto out; |
| 1087 | |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1088 | odst = sk_dst_get(sk); |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1089 | |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1090 | if (sock_owned_by_user(sk) || !odst) { |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1091 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
| 1092 | goto out; |
| 1093 | } |
| 1094 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1095 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1096 | |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1097 | rt = (struct rtable *)odst; |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1098 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1099 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
| 1100 | if (IS_ERR(rt)) |
| 1101 | goto out; |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1102 | |
| 1103 | new = true; |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1104 | } |
| 1105 | |
| 1106 | __ip_rt_update_pmtu((struct rtable *) rt->dst.path, &fl4, mtu); |
| 1107 | |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1108 | if (!dst_check(&rt->dst, 0)) { |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1109 | if (new) |
| 1110 | dst_release(&rt->dst); |
| 1111 | |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1112 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
| 1113 | if (IS_ERR(rt)) |
| 1114 | goto out; |
| 1115 | |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1116 | new = true; |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1117 | } |
| 1118 | |
Steffen Klassert | b44108d | 2013-01-22 00:01:28 +0000 | [diff] [blame] | 1119 | if (new) |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1120 | sk_dst_set(sk, &rt->dst); |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1121 | |
| 1122 | out: |
| 1123 | bh_unlock_sock(sk); |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1124 | dst_release(odst); |
Steffen Klassert | 9cb3a50 | 2013-01-21 01:59:11 +0000 | [diff] [blame] | 1125 | } |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 1126 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
David S. Miller | f39925d | 2011-02-09 22:00:16 -0800 | [diff] [blame] | 1127 | |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1128 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
| 1129 | int oif, u32 mark, u8 protocol, int flow_flags) |
| 1130 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1131 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1132 | struct flowi4 fl4; |
| 1133 | struct rtable *rt; |
| 1134 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1135 | __build_flow_key(net, &fl4, NULL, iph, oif, |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1136 | RT_TOS(iph->tos), protocol, mark, flow_flags); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1137 | rt = __ip_route_output_key(net, &fl4); |
| 1138 | if (!IS_ERR(rt)) { |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1139 | __ip_do_redirect(rt, skb, &fl4, false); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1140 | ip_rt_put(rt); |
| 1141 | } |
| 1142 | } |
| 1143 | EXPORT_SYMBOL_GPL(ipv4_redirect); |
| 1144 | |
| 1145 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) |
| 1146 | { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1147 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
| 1148 | struct flowi4 fl4; |
| 1149 | struct rtable *rt; |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1150 | struct net *net = sock_net(sk); |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1151 | |
Lorenzo Colitti | e2d118a | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1152 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
| 1153 | rt = __ip_route_output_key(net, &fl4); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1154 | if (!IS_ERR(rt)) { |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1155 | __ip_do_redirect(rt, skb, &fl4, false); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1156 | ip_rt_put(rt); |
| 1157 | } |
David S. Miller | b42597e | 2012-07-11 21:25:45 -0700 | [diff] [blame] | 1158 | } |
| 1159 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); |
| 1160 | |
David S. Miller | efbc368 | 2011-12-01 13:38:59 -0500 | [diff] [blame] | 1161 | static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) |
| 1162 | { |
| 1163 | struct rtable *rt = (struct rtable *) dst; |
| 1164 | |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1165 | /* All IPV4 dsts are created with ->obsolete set to the value |
| 1166 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down |
| 1167 | * into this function always. |
| 1168 | * |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 1169 | * When a PMTU/redirect information update invalidates a route, |
| 1170 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or |
| 1171 | * DST_OBSOLETE_DEAD by dst_free(). |
David S. Miller | ceb3320 | 2012-07-17 11:31:28 -0700 | [diff] [blame] | 1172 | */ |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 1173 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
David S. Miller | efbc368 | 2011-12-01 13:38:59 -0500 | [diff] [blame] | 1174 | return NULL; |
Timo Teräs | d11a4dc | 2010-03-18 23:20:20 +0000 | [diff] [blame] | 1175 | return dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | } |
| 1177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | static void ipv4_link_failure(struct sk_buff *skb) |
| 1179 | { |
| 1180 | struct rtable *rt; |
| 1181 | |
| 1182 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
| 1183 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 1184 | rt = skb_rtable(skb); |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1185 | if (rt) |
| 1186 | dst_set_expires(&rt->dst, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
Eric W. Biederman | ede2059 | 2015-10-07 16:48:47 -0500 | [diff] [blame] | 1189 | static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | { |
Joe Perches | 91df42b | 2012-05-15 14:11:54 +0000 | [diff] [blame] | 1191 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
| 1192 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, |
| 1193 | skb->dev ? skb->dev->name : "?"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | kfree_skb(skb); |
Dave Jones | c378a9c | 2011-05-21 07:16:42 +0000 | [diff] [blame] | 1195 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | return 0; |
| 1197 | } |
| 1198 | |
| 1199 | /* |
| 1200 | We do not cache source address of outgoing interface, |
| 1201 | because it is used only by IP RR, TS and SRR options, |
| 1202 | so that it out of fast path. |
| 1203 | |
| 1204 | BTW remember: "addr" is allowed to be not aligned |
| 1205 | in IP options! |
| 1206 | */ |
| 1207 | |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1208 | 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] | 1209 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 1210 | __be32 src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 1212 | if (rt_is_output_route(rt)) |
David S. Miller | c5be24f | 2011-05-13 18:01:21 -0400 | [diff] [blame] | 1213 | src = ip_hdr(skb)->saddr; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1214 | else { |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1215 | struct fib_result res; |
| 1216 | struct flowi4 fl4; |
| 1217 | struct iphdr *iph; |
| 1218 | |
| 1219 | iph = ip_hdr(skb); |
| 1220 | |
| 1221 | memset(&fl4, 0, sizeof(fl4)); |
| 1222 | fl4.daddr = iph->daddr; |
| 1223 | fl4.saddr = iph->saddr; |
Julian Anastasov | b0fe4a3 | 2011-07-23 02:00:41 +0000 | [diff] [blame] | 1224 | fl4.flowi4_tos = RT_TOS(iph->tos); |
David S. Miller | 8e36360 | 2011-05-13 17:29:41 -0400 | [diff] [blame] | 1225 | fl4.flowi4_oif = rt->dst.dev->ifindex; |
| 1226 | fl4.flowi4_iif = skb->dev->ifindex; |
| 1227 | fl4.flowi4_mark = skb->mark; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1228 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1229 | rcu_read_lock(); |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1230 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 1231 | src = FIB_RES_PREFSRC(dev_net(rt->dst.dev), res); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1232 | else |
David S. Miller | f8126f1 | 2012-07-13 05:03:45 -0700 | [diff] [blame] | 1233 | src = inet_select_addr(rt->dst.dev, |
| 1234 | rt_nexthop(rt, iph->daddr), |
| 1235 | RT_SCOPE_UNIVERSE); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1236 | rcu_read_unlock(); |
| 1237 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | memcpy(addr, &src, 4); |
| 1239 | } |
| 1240 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1241 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | static void set_class_tag(struct rtable *rt, u32 tag) |
| 1243 | { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1244 | if (!(rt->dst.tclassid & 0xFFFF)) |
| 1245 | rt->dst.tclassid |= tag & 0xFFFF; |
| 1246 | if (!(rt->dst.tclassid & 0xFFFF0000)) |
| 1247 | rt->dst.tclassid |= tag & 0xFFFF0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
| 1249 | #endif |
| 1250 | |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1251 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
| 1252 | { |
Gao Feng | 7ed14d9 | 2017-04-12 12:34:03 +0800 | [diff] [blame] | 1253 | unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); |
| 1254 | unsigned int advmss = max_t(unsigned int, dst->dev->mtu - header_size, |
| 1255 | ip_rt_min_advmss); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1256 | |
Gao Feng | 7ed14d9 | 2017-04-12 12:34:03 +0800 | [diff] [blame] | 1257 | return min(advmss, IPV4_MAX_PMTU - header_size); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1258 | } |
| 1259 | |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 1260 | static unsigned int ipv4_mtu(const struct dst_entry *dst) |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1261 | { |
Steffen Klassert | 261663b | 2011-11-23 02:14:50 +0000 | [diff] [blame] | 1262 | const struct rtable *rt = (const struct rtable *) dst; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1263 | unsigned int mtu = rt->rt_pmtu; |
| 1264 | |
Alexander Duyck | 98d75c3 | 2012-08-27 06:30:01 +0000 | [diff] [blame] | 1265 | if (!mtu || time_after_eq(jiffies, rt->dst.expires)) |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 1266 | mtu = dst_metric_raw(dst, RTAX_MTU); |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 1267 | |
Steffen Klassert | 38d523e | 2013-01-16 20:55:01 +0000 | [diff] [blame] | 1268 | if (mtu) |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 1269 | return mtu; |
| 1270 | |
| 1271 | mtu = dst->dev->mtu; |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1272 | |
| 1273 | if (unlikely(dst_metric_locked(dst, RTAX_MTU))) { |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1274 | if (rt->rt_uses_gateway && mtu > 576) |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1275 | mtu = 576; |
| 1276 | } |
| 1277 | |
Roopa Prabhu | 14972cb | 2016-08-24 20:10:43 -0700 | [diff] [blame] | 1278 | mtu = min_t(unsigned int, mtu, IP_MAX_MTU); |
| 1279 | |
| 1280 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); |
David S. Miller | d33e455 | 2010-12-14 13:01:14 -0800 | [diff] [blame] | 1281 | } |
| 1282 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1283 | 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] | 1284 | { |
Eric Dumazet | caa4152 | 2014-09-03 22:21:56 -0700 | [diff] [blame] | 1285 | struct fnhe_hash_bucket *hash = rcu_dereference(nh->nh_exceptions); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1286 | struct fib_nh_exception *fnhe; |
| 1287 | u32 hval; |
| 1288 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1289 | if (!hash) |
| 1290 | return NULL; |
| 1291 | |
David S. Miller | d3a25c9 | 2012-07-17 13:23:08 -0700 | [diff] [blame] | 1292 | hval = fnhe_hashfun(daddr); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1293 | |
| 1294 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; |
| 1295 | fnhe = rcu_dereference(fnhe->fnhe_next)) { |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1296 | if (fnhe->fnhe_daddr == daddr) |
| 1297 | return fnhe; |
| 1298 | } |
| 1299 | return NULL; |
| 1300 | } |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1301 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1302 | 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] | 1303 | __be32 daddr) |
| 1304 | { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1305 | bool ret = false; |
| 1306 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1307 | spin_lock_bh(&fnhe_lock); |
Julian Anastasov | aee06da | 2012-07-18 10:15:35 +0000 | [diff] [blame] | 1308 | |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1309 | if (daddr == fnhe->fnhe_daddr) { |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1310 | struct rtable __rcu **porig; |
| 1311 | struct rtable *orig; |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 1312 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1313 | |
| 1314 | if (rt_is_input_route(rt)) |
| 1315 | porig = &fnhe->fnhe_rth_input; |
| 1316 | else |
| 1317 | porig = &fnhe->fnhe_rth_output; |
| 1318 | orig = rcu_dereference(*porig); |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 1319 | |
| 1320 | if (fnhe->fnhe_genid != genid) { |
| 1321 | fnhe->fnhe_genid = genid; |
Steffen Klassert | 13d82bf | 2012-10-17 21:17:44 +0000 | [diff] [blame] | 1322 | fnhe->fnhe_gw = 0; |
| 1323 | fnhe->fnhe_pmtu = 0; |
| 1324 | fnhe->fnhe_expires = 0; |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1325 | fnhe_flush_routes(fnhe); |
| 1326 | orig = NULL; |
Steffen Klassert | 13d82bf | 2012-10-17 21:17:44 +0000 | [diff] [blame] | 1327 | } |
Timo Teräs | 387aa65 | 2013-05-27 20:46:31 +0000 | [diff] [blame] | 1328 | fill_route_from_fnhe(rt, fnhe); |
| 1329 | if (!rt->rt_gateway) |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1330 | rt->rt_gateway = daddr; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1331 | |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1332 | if (!(rt->dst.flags & DST_NOCACHE)) { |
| 1333 | rcu_assign_pointer(*porig, rt); |
| 1334 | if (orig) |
| 1335 | rt_free(orig); |
| 1336 | ret = true; |
| 1337 | } |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1338 | |
| 1339 | fnhe->fnhe_stamp = jiffies; |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1340 | } |
| 1341 | spin_unlock_bh(&fnhe_lock); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1342 | |
| 1343 | return ret; |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1344 | } |
| 1345 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1346 | 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] | 1347 | { |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1348 | struct rtable *orig, *prev, **p; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1349 | bool ret = true; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1350 | |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1351 | if (rt_is_input_route(rt)) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1352 | p = (struct rtable **)&nh->nh_rth_input; |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1353 | } else { |
Christoph Lameter | 903ceff | 2014-08-17 12:30:35 -0500 | [diff] [blame] | 1354 | p = (struct rtable **)raw_cpu_ptr(nh->nh_pcpu_rth_output); |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 1355 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1356 | orig = *p; |
| 1357 | |
| 1358 | prev = cmpxchg(p, orig, rt); |
| 1359 | if (prev == orig) { |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1360 | if (orig) |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1361 | rt_free(orig); |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1362 | } else |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1363 | ret = false; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1364 | |
| 1365 | return ret; |
| 1366 | } |
| 1367 | |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1368 | struct uncached_list { |
| 1369 | spinlock_t lock; |
| 1370 | struct list_head head; |
| 1371 | }; |
| 1372 | |
| 1373 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1374 | |
| 1375 | static void rt_add_uncached_list(struct rtable *rt) |
| 1376 | { |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1377 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
| 1378 | |
| 1379 | rt->rt_uncached_list = ul; |
| 1380 | |
| 1381 | spin_lock_bh(&ul->lock); |
| 1382 | list_add_tail(&rt->rt_uncached, &ul->head); |
| 1383 | spin_unlock_bh(&ul->lock); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1384 | } |
| 1385 | |
| 1386 | static void ipv4_dst_destroy(struct dst_entry *dst) |
| 1387 | { |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1388 | struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1389 | struct rtable *rt = (struct rtable *) dst; |
| 1390 | |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1391 | if (p != &dst_default_metrics && atomic_dec_and_test(&p->refcnt)) |
| 1392 | kfree(p); |
| 1393 | |
Eric Dumazet | 78df76a | 2012-08-24 05:40:47 +0000 | [diff] [blame] | 1394 | if (!list_empty(&rt->rt_uncached)) { |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1395 | struct uncached_list *ul = rt->rt_uncached_list; |
| 1396 | |
| 1397 | spin_lock_bh(&ul->lock); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1398 | list_del(&rt->rt_uncached); |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1399 | spin_unlock_bh(&ul->lock); |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1400 | } |
| 1401 | } |
| 1402 | |
| 1403 | void rt_flush_dev(struct net_device *dev) |
| 1404 | { |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1405 | struct net *net = dev_net(dev); |
| 1406 | struct rtable *rt; |
| 1407 | int cpu; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1408 | |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1409 | for_each_possible_cpu(cpu) { |
| 1410 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); |
| 1411 | |
| 1412 | spin_lock_bh(&ul->lock); |
| 1413 | list_for_each_entry(rt, &ul->head, rt_uncached) { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1414 | if (rt->dst.dev != dev) |
| 1415 | continue; |
| 1416 | rt->dst.dev = net->loopback_dev; |
| 1417 | dev_hold(rt->dst.dev); |
| 1418 | dev_put(dev); |
| 1419 | } |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 1420 | spin_unlock_bh(&ul->lock); |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1421 | } |
| 1422 | } |
| 1423 | |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 1424 | static bool rt_cache_valid(const struct rtable *rt) |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1425 | { |
Eric Dumazet | 4331deb | 2012-07-25 05:11:23 +0000 | [diff] [blame] | 1426 | return rt && |
| 1427 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && |
| 1428 | !rt_is_expired(rt); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1429 | } |
| 1430 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1431 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 1432 | const struct fib_result *res, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1433 | struct fib_nh_exception *fnhe, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1434 | struct fib_info *fi, u16 type, u32 itag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | { |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1436 | bool cached = false; |
| 1437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | if (fi) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1439 | struct fib_nh *nh = &FIB_RES_NH(*res); |
| 1440 | |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1441 | if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) { |
David S. Miller | 4895c77 | 2012-07-17 04:19:00 -0700 | [diff] [blame] | 1442 | rt->rt_gateway = nh->nh_gw; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1443 | rt->rt_uses_gateway = 1; |
| 1444 | } |
Eric Dumazet | 3fb07da | 2017-05-25 14:27:35 -0700 | [diff] [blame] | 1445 | dst_init_metrics(&rt->dst, fi->fib_metrics->metrics, true); |
| 1446 | if (fi->fib_metrics != &dst_default_metrics) { |
| 1447 | rt->dst._metrics |= DST_METRICS_REFCOUNTED; |
| 1448 | atomic_inc(&fi->fib_metrics->refcnt); |
| 1449 | } |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1450 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1451 | rt->dst.tclassid = nh->nh_tclassid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | #endif |
Jiri Benc | 61adedf | 2015-08-20 13:56:25 +0200 | [diff] [blame] | 1453 | rt->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1454 | if (unlikely(fnhe)) |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1455 | cached = rt_bind_exception(rt, fnhe, daddr); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 1456 | else if (!(rt->dst.flags & DST_NOCACHE)) |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1457 | cached = rt_cache_route(nh, rt); |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 1458 | if (unlikely(!cached)) { |
| 1459 | /* Routes we intend to cache in nexthop exception or |
| 1460 | * FIB nexthop have the DST_NOCACHE bit clear. |
| 1461 | * However, if we are unsuccessful at storing this |
| 1462 | * route into the cache we really need to set it. |
| 1463 | */ |
| 1464 | rt->dst.flags |= DST_NOCACHE; |
| 1465 | if (!rt->rt_gateway) |
| 1466 | rt->rt_gateway = daddr; |
| 1467 | rt_add_uncached_list(rt); |
| 1468 | } |
| 1469 | } else |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 1470 | rt_add_uncached_list(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1472 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 1474 | set_class_tag(rt, res->tclassid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | #endif |
| 1476 | set_class_tag(rt, itag); |
| 1477 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | } |
| 1479 | |
David Ahern | 9ab179d | 2016-04-07 11:10:06 -0700 | [diff] [blame] | 1480 | struct rtable *rt_dst_alloc(struct net_device *dev, |
| 1481 | unsigned int flags, u16 type, |
| 1482 | bool nopolicy, bool noxfrm, bool will_cache) |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1483 | { |
David Ahern | d08c4f3 | 2015-09-02 13:58:34 -0700 | [diff] [blame] | 1484 | struct rtable *rt; |
| 1485 | |
| 1486 | rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK, |
| 1487 | (will_cache ? 0 : (DST_HOST | DST_NOCACHE)) | |
| 1488 | (nopolicy ? DST_NOPOLICY : 0) | |
| 1489 | (noxfrm ? DST_NOXFRM : 0)); |
| 1490 | |
| 1491 | if (rt) { |
| 1492 | rt->rt_genid = rt_genid_ipv4(dev_net(dev)); |
| 1493 | rt->rt_flags = flags; |
| 1494 | rt->rt_type = type; |
| 1495 | rt->rt_is_input = 0; |
| 1496 | rt->rt_iif = 0; |
| 1497 | rt->rt_pmtu = 0; |
| 1498 | rt->rt_gateway = 0; |
| 1499 | rt->rt_uses_gateway = 0; |
David Ahern | b7503e0 | 2015-09-02 13:58:35 -0700 | [diff] [blame] | 1500 | rt->rt_table_id = 0; |
David Ahern | d08c4f3 | 2015-09-02 13:58:34 -0700 | [diff] [blame] | 1501 | INIT_LIST_HEAD(&rt->rt_uncached); |
| 1502 | |
| 1503 | rt->dst.output = ip_output; |
| 1504 | if (flags & RTCF_LOCAL) |
| 1505 | rt->dst.input = ip_local_deliver; |
| 1506 | } |
| 1507 | |
| 1508 | return rt; |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1509 | } |
David Ahern | 9ab179d | 2016-04-07 11:10:06 -0700 | [diff] [blame] | 1510 | EXPORT_SYMBOL(rt_dst_alloc); |
David S. Miller | 0c4dcd5 | 2011-02-17 15:42:37 -0800 | [diff] [blame] | 1511 | |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1512 | /* called in rcu_read_lock() section */ |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1513 | 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] | 1514 | u8 tos, struct net_device *dev, int our) |
| 1515 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | struct rtable *rth; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1517 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
David Ahern | d08c4f3 | 2015-09-02 13:58:34 -0700 | [diff] [blame] | 1518 | unsigned int flags = RTCF_MULTICAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | u32 itag = 0; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1520 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | |
| 1522 | /* Primary sanity checks. */ |
| 1523 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1524 | if (!in_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | return -EINVAL; |
| 1526 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 1527 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1528 | skb->protocol != htons(ETH_P_IP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | goto e_inval; |
| 1530 | |
Alexander Duyck | 75fea73 | 2015-09-28 11:10:38 -0700 | [diff] [blame] | 1531 | if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) |
| 1532 | goto e_inval; |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1533 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1534 | if (ipv4_is_zeronet(saddr)) { |
| 1535 | if (!ipv4_is_local_multicast(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | goto e_inval; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1537 | } else { |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1538 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
| 1539 | in_dev, &itag); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1540 | if (err < 0) |
| 1541 | goto e_err; |
| 1542 | } |
David Ahern | d08c4f3 | 2015-09-02 13:58:34 -0700 | [diff] [blame] | 1543 | if (our) |
| 1544 | flags |= RTCF_LOCAL; |
| 1545 | |
| 1546 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1547 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | if (!rth) |
| 1549 | goto e_nobufs; |
| 1550 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 1551 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1552 | rth->dst.tclassid = itag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | #endif |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1554 | rth->dst.output = ip_rt_bug; |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1555 | rth->rt_is_input= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | |
| 1557 | #ifdef CONFIG_IP_MROUTE |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1558 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1559 | rth->dst.input = ip_mr_input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | #endif |
| 1561 | RT_CACHE_STAT_INC(in_slow_mc); |
| 1562 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 1563 | skb_dst_set(skb, &rth->dst); |
| 1564 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
| 1566 | e_nobufs: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | e_inval: |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1569 | return -EINVAL; |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1570 | e_err: |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1571 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | } |
| 1573 | |
| 1574 | |
| 1575 | static void ip_handle_martian_source(struct net_device *dev, |
| 1576 | struct in_device *in_dev, |
| 1577 | struct sk_buff *skb, |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1578 | __be32 daddr, |
| 1579 | __be32 saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | { |
| 1581 | RT_CACHE_STAT_INC(in_martian_src); |
| 1582 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
| 1583 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { |
| 1584 | /* |
| 1585 | * RFC1812 recommendation, if source is martian, |
| 1586 | * the only hint is MAC header. |
| 1587 | */ |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1588 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1589 | &daddr, &saddr, dev->name); |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1590 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1591 | print_hex_dump(KERN_WARNING, "ll header: ", |
| 1592 | DUMP_PREFIX_OFFSET, 16, 1, |
| 1593 | skb_mac_header(skb), |
| 1594 | dev->hard_header_len, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | } |
| 1596 | } |
| 1597 | #endif |
| 1598 | } |
| 1599 | |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 1600 | static void ip_del_fnhe(struct fib_nh *nh, __be32 daddr) |
| 1601 | { |
| 1602 | struct fnhe_hash_bucket *hash; |
| 1603 | struct fib_nh_exception *fnhe, __rcu **fnhe_p; |
| 1604 | u32 hval = fnhe_hashfun(daddr); |
| 1605 | |
| 1606 | spin_lock_bh(&fnhe_lock); |
| 1607 | |
| 1608 | hash = rcu_dereference_protected(nh->nh_exceptions, |
| 1609 | lockdep_is_held(&fnhe_lock)); |
| 1610 | hash += hval; |
| 1611 | |
| 1612 | fnhe_p = &hash->chain; |
| 1613 | fnhe = rcu_dereference_protected(*fnhe_p, lockdep_is_held(&fnhe_lock)); |
| 1614 | while (fnhe) { |
| 1615 | if (fnhe->fnhe_daddr == daddr) { |
| 1616 | rcu_assign_pointer(*fnhe_p, rcu_dereference_protected( |
| 1617 | fnhe->fnhe_next, lockdep_is_held(&fnhe_lock))); |
| 1618 | fnhe_flush_routes(fnhe); |
| 1619 | kfree_rcu(fnhe, rcu); |
| 1620 | break; |
| 1621 | } |
| 1622 | fnhe_p = &fnhe->fnhe_next; |
| 1623 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, |
| 1624 | lockdep_is_held(&fnhe_lock)); |
| 1625 | } |
| 1626 | |
| 1627 | spin_unlock_bh(&fnhe_lock); |
| 1628 | } |
| 1629 | |
Thomas Graf | efd8570 | 2016-11-30 17:10:09 +0100 | [diff] [blame] | 1630 | static void set_lwt_redirect(struct rtable *rth) |
| 1631 | { |
| 1632 | if (lwtunnel_output_redirect(rth->dst.lwtstate)) { |
| 1633 | rth->dst.lwtstate->orig_output = rth->dst.output; |
| 1634 | rth->dst.output = lwtunnel_output; |
| 1635 | } |
| 1636 | |
| 1637 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { |
| 1638 | rth->dst.lwtstate->orig_input = rth->dst.input; |
| 1639 | rth->dst.input = lwtunnel_input; |
| 1640 | } |
| 1641 | } |
| 1642 | |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1643 | /* called in rcu_read_lock() section */ |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1644 | static int __mkroute_input(struct sk_buff *skb, |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 1645 | const struct fib_result *res, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1646 | struct in_device *in_dev, |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1647 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | { |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1649 | struct fib_nh_exception *fnhe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | struct rtable *rth; |
| 1651 | int err; |
| 1652 | struct in_device *out_dev; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1653 | bool do_cache; |
Li RongQing | fbdc0ad | 2014-05-22 16:36:55 +0800 | [diff] [blame] | 1654 | u32 itag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
| 1656 | /* get a working reference to the output device */ |
Eric Dumazet | 4736022 | 2010-06-03 04:13:21 +0000 | [diff] [blame] | 1657 | out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1658 | if (!out_dev) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1659 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | return -EINVAL; |
| 1661 | } |
| 1662 | |
Michael Smith | 5c04c81 | 2011-04-07 04:51:50 +0000 | [diff] [blame] | 1663 | 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] | 1664 | in_dev->dev, in_dev, &itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | if (err < 0) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1666 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | saddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | goto cleanup; |
| 1670 | } |
| 1671 | |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1672 | do_cache = res->fi && !itag; |
| 1673 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && |
Hannes Frederic Sowa | df4d925 | 2015-01-23 12:01:26 +0100 | [diff] [blame] | 1674 | skb->protocol == htons(ETH_P_IP) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | (IN_DEV_SHARED_MEDIA(out_dev) || |
Hannes Frederic Sowa | df4d925 | 2015-01-23 12:01:26 +0100 | [diff] [blame] | 1676 | inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) |
| 1677 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | |
| 1679 | if (skb->protocol != htons(ETH_P_IP)) { |
| 1680 | /* Not IP (i.e. ARP). Do not create route, if it is |
| 1681 | * invalid for proxy arp. DNAT routes are always valid. |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 1682 | * |
| 1683 | * Proxy arp feature have been extended to allow, ARP |
| 1684 | * replies back to the same interface, to support |
| 1685 | * Private VLAN switch technologies. See arp.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | */ |
Jesper Dangaard Brouer | 6532414 | 2010-01-05 05:50:47 +0000 | [diff] [blame] | 1687 | if (out_dev == in_dev && |
| 1688 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | err = -EINVAL; |
| 1690 | goto cleanup; |
| 1691 | } |
| 1692 | } |
| 1693 | |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1694 | fnhe = find_exception(&FIB_RES_NH(*res), daddr); |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1695 | if (do_cache) { |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 1696 | if (fnhe) { |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1697 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 1698 | if (rth && rth->dst.expires && |
| 1699 | time_after(jiffies, rth->dst.expires)) { |
| 1700 | ip_del_fnhe(&FIB_RES_NH(*res), daddr); |
| 1701 | fnhe = NULL; |
| 1702 | } else { |
| 1703 | goto rt_cache; |
| 1704 | } |
| 1705 | } |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1706 | |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 1707 | rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input); |
| 1708 | |
| 1709 | rt_cache: |
Julian Anastasov | e81da0e | 2012-10-08 11:41:15 +0000 | [diff] [blame] | 1710 | if (rt_cache_valid(rth)) { |
| 1711 | skb_dst_set_noref(skb, &rth->dst); |
| 1712 | goto out; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1713 | } |
| 1714 | } |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 1715 | |
David Ahern | d08c4f3 | 2015-09-02 13:58:34 -0700 | [diff] [blame] | 1716 | rth = rt_dst_alloc(out_dev->dev, 0, res->type, |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 1717 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1718 | IN_DEV_CONF_GET(out_dev, NOXFRM), do_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | if (!rth) { |
| 1720 | err = -ENOBUFS; |
| 1721 | goto cleanup; |
| 1722 | } |
| 1723 | |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1724 | rth->rt_is_input = 1; |
David Ahern | b7503e0 | 2015-09-02 13:58:35 -0700 | [diff] [blame] | 1725 | if (res->table) |
| 1726 | rth->rt_table_id = res->table->tb_id; |
Duan Jiong | a625486 | 2014-02-17 15:23:43 +0800 | [diff] [blame] | 1727 | RT_CACHE_STAT_INC(in_slow_tot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1729 | rth->dst.input = ip_forward; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 1731 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag); |
Thomas Graf | efd8570 | 2016-11-30 17:10:09 +0100 | [diff] [blame] | 1732 | set_lwt_redirect(rth); |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1733 | skb_dst_set(skb, &rth->dst); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1734 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | err = 0; |
| 1736 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | return err; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1738 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1740 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1741 | /* To make ICMP packets follow the right flow, the multipath hash is |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1742 | * calculated from the inner IP addresses. |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1743 | */ |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1744 | static void ip_multipath_l3_keys(const struct sk_buff *skb, |
| 1745 | struct flow_keys *hash_keys) |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1746 | { |
| 1747 | const struct iphdr *outer_iph = ip_hdr(skb); |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1748 | const struct iphdr *inner_iph; |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1749 | const struct icmphdr *icmph; |
| 1750 | struct iphdr _inner_iph; |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1751 | struct icmphdr _icmph; |
| 1752 | |
| 1753 | hash_keys->addrs.v4addrs.src = outer_iph->saddr; |
| 1754 | hash_keys->addrs.v4addrs.dst = outer_iph->daddr; |
| 1755 | if (likely(outer_iph->protocol != IPPROTO_ICMP)) |
| 1756 | return; |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1757 | |
| 1758 | if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0)) |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1759 | return; |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1760 | |
| 1761 | icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph), |
| 1762 | &_icmph); |
| 1763 | if (!icmph) |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1764 | return; |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1765 | |
| 1766 | if (icmph->type != ICMP_DEST_UNREACH && |
| 1767 | icmph->type != ICMP_REDIRECT && |
| 1768 | icmph->type != ICMP_TIME_EXCEEDED && |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1769 | icmph->type != ICMP_PARAMETERPROB) |
| 1770 | return; |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1771 | |
| 1772 | inner_iph = skb_header_pointer(skb, |
| 1773 | outer_iph->ihl * 4 + sizeof(_icmph), |
| 1774 | sizeof(_inner_iph), &_inner_iph); |
| 1775 | if (!inner_iph) |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1776 | return; |
| 1777 | hash_keys->addrs.v4addrs.src = inner_iph->saddr; |
| 1778 | hash_keys->addrs.v4addrs.dst = inner_iph->daddr; |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1779 | } |
| 1780 | |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1781 | /* if skb is set it will be used and fl4 can be NULL */ |
| 1782 | int fib_multipath_hash(const struct fib_info *fi, const struct flowi4 *fl4, |
| 1783 | const struct sk_buff *skb) |
| 1784 | { |
| 1785 | struct net *net = fi->fib_net; |
| 1786 | struct flow_keys hash_keys; |
| 1787 | u32 mhash; |
| 1788 | |
| 1789 | switch (net->ipv4.sysctl_fib_multipath_hash_policy) { |
| 1790 | case 0: |
| 1791 | memset(&hash_keys, 0, sizeof(hash_keys)); |
| 1792 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
| 1793 | if (skb) { |
| 1794 | ip_multipath_l3_keys(skb, &hash_keys); |
| 1795 | } else { |
| 1796 | hash_keys.addrs.v4addrs.src = fl4->saddr; |
| 1797 | hash_keys.addrs.v4addrs.dst = fl4->daddr; |
| 1798 | } |
| 1799 | break; |
| 1800 | case 1: |
| 1801 | /* skb is currently provided only when forwarding */ |
| 1802 | if (skb) { |
| 1803 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; |
| 1804 | struct flow_keys keys; |
| 1805 | |
| 1806 | /* short-circuit if we already have L4 hash present */ |
| 1807 | if (skb->l4_hash) |
| 1808 | return skb_get_hash_raw(skb) >> 1; |
| 1809 | memset(&hash_keys, 0, sizeof(hash_keys)); |
| 1810 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
| 1811 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; |
| 1812 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; |
| 1813 | hash_keys.ports.src = keys.ports.src; |
| 1814 | hash_keys.ports.dst = keys.ports.dst; |
| 1815 | hash_keys.basic.ip_proto = keys.basic.ip_proto; |
| 1816 | } else { |
| 1817 | memset(&hash_keys, 0, sizeof(hash_keys)); |
| 1818 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
| 1819 | hash_keys.addrs.v4addrs.src = fl4->saddr; |
| 1820 | hash_keys.addrs.v4addrs.dst = fl4->daddr; |
| 1821 | hash_keys.ports.src = fl4->fl4_sport; |
| 1822 | hash_keys.ports.dst = fl4->fl4_dport; |
| 1823 | hash_keys.basic.ip_proto = fl4->flowi4_proto; |
| 1824 | } |
| 1825 | break; |
| 1826 | } |
| 1827 | mhash = flow_hash_from_keys(&hash_keys); |
| 1828 | |
| 1829 | return mhash >> 1; |
| 1830 | } |
| 1831 | EXPORT_SYMBOL_GPL(fib_multipath_hash); |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 1832 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
| 1833 | |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1834 | static int ip_mkroute_input(struct sk_buff *skb, |
| 1835 | struct fib_result *res, |
Stephen Hemminger | 5969f71 | 2008-04-10 01:52:09 -0700 | [diff] [blame] | 1836 | struct in_device *in_dev, |
| 1837 | __be32 daddr, __be32 saddr, u32 tos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1840 | if (res->fi && res->fi->fib_nhs > 1) { |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 1841 | int h = fib_multipath_hash(res->fi, NULL, skb); |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1842 | |
Peter Nørlund | 0e884c7 | 2015-09-30 10:12:21 +0200 | [diff] [blame] | 1843 | fib_select_multipath(res, h); |
| 1844 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | #endif |
| 1846 | |
| 1847 | /* create a routing cache entry */ |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1848 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | } |
| 1850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | /* |
| 1852 | * NOTE. We drop all the packets that has local source |
| 1853 | * addresses, because every properly looped back packet |
| 1854 | * must have correct destination already attached by output routine. |
| 1855 | * |
| 1856 | * Such approach solves two big problems: |
| 1857 | * 1. Not simplex devices are handled properly. |
| 1858 | * 2. IP spoofing attempts are filtered with 100% of guarantee. |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 1859 | * called with rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | */ |
| 1861 | |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 1862 | 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] | 1863 | u8 tos, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | { |
| 1865 | struct fib_result res; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 1866 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Thomas Graf | 1b7179d | 2015-07-21 10:43:59 +0200 | [diff] [blame] | 1867 | struct ip_tunnel_info *tun_info; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1868 | struct flowi4 fl4; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1869 | unsigned int flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | u32 itag = 0; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1871 | struct rtable *rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | int err = -EINVAL; |
Daniel Baluta | 5e73ea1 | 2012-04-15 01:34:41 +0000 | [diff] [blame] | 1873 | struct net *net = dev_net(dev); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1874 | bool do_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | |
| 1876 | /* IP on this device is disabled. */ |
| 1877 | |
| 1878 | if (!in_dev) |
| 1879 | goto out; |
| 1880 | |
| 1881 | /* Check for the most weird martians, which can be not detected |
| 1882 | by fib_lookup. |
| 1883 | */ |
| 1884 | |
Jiri Benc | 61adedf | 2015-08-20 13:56:25 +0200 | [diff] [blame] | 1885 | tun_info = skb_tunnel_info(skb); |
Jiri Benc | 46fa062 | 2015-08-28 20:48:19 +0200 | [diff] [blame] | 1886 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
Thomas Graf | 1b7179d | 2015-07-21 10:43:59 +0200 | [diff] [blame] | 1887 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
| 1888 | else |
| 1889 | fl4.flowi4_tun_key.tun_id = 0; |
Thomas Graf | f38a9eb | 2015-07-21 10:43:56 +0200 | [diff] [blame] | 1890 | skb_dst_drop(skb); |
| 1891 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1892 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | goto martian_source; |
| 1894 | |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1895 | res.fi = NULL; |
David Ahern | bde6f9d | 2015-09-16 10:16:39 -0600 | [diff] [blame] | 1896 | res.table = NULL; |
Andy Walls | 27a954b | 2010-10-17 15:11:22 +0000 | [diff] [blame] | 1897 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | goto brd_input; |
| 1899 | |
| 1900 | /* Accept zero addresses only to limited broadcast; |
| 1901 | * I even do not know to fix it or not. Waiting for complains :-) |
| 1902 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 1903 | if (ipv4_is_zeronet(saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | goto martian_source; |
| 1905 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1906 | if (ipv4_is_zeronet(daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | goto martian_destination; |
| 1908 | |
Eric Dumazet | 9eb43e7 | 2012-08-03 21:27:25 +0000 | [diff] [blame] | 1909 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
| 1910 | * and call it once if daddr or/and saddr are loopback addresses |
| 1911 | */ |
| 1912 | if (ipv4_is_loopback(daddr)) { |
| 1913 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1914 | goto martian_destination; |
Eric Dumazet | 9eb43e7 | 2012-08-03 21:27:25 +0000 | [diff] [blame] | 1915 | } else if (ipv4_is_loopback(saddr)) { |
| 1916 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 1917 | goto martian_source; |
| 1918 | } |
| 1919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | /* |
| 1921 | * Now we are ready to route packet. |
| 1922 | */ |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1923 | fl4.flowi4_oif = 0; |
David Ahern | e0d56fd | 2016-09-10 12:09:57 -0700 | [diff] [blame] | 1924 | fl4.flowi4_iif = dev->ifindex; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1925 | fl4.flowi4_mark = skb->mark; |
| 1926 | fl4.flowi4_tos = tos; |
| 1927 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
David Ahern | b84f787 | 2015-09-29 19:07:07 -0700 | [diff] [blame] | 1928 | fl4.flowi4_flags = 0; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 1929 | fl4.daddr = daddr; |
| 1930 | fl4.saddr = saddr; |
Julian Anastasov | 8bcfd09 | 2017-02-26 15:50:52 +0200 | [diff] [blame] | 1931 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
Andy Gospodarek | 0eeb075 | 2015-06-23 13:45:37 -0400 | [diff] [blame] | 1932 | err = fib_lookup(net, &fl4, &res, 0); |
Duan Jiong | cd0f0b9 | 2014-02-14 18:26:22 +0800 | [diff] [blame] | 1933 | if (err != 0) { |
| 1934 | if (!IN_DEV_FORWARD(in_dev)) |
| 1935 | err = -EHOSTUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | goto no_route; |
Duan Jiong | cd0f0b9 | 2014-02-14 18:26:22 +0800 | [diff] [blame] | 1937 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | |
| 1939 | if (res.type == RTN_BROADCAST) |
| 1940 | goto brd_input; |
| 1941 | |
| 1942 | if (res.type == RTN_LOCAL) { |
Michael Smith | 5c04c81 | 2011-04-07 04:51:50 +0000 | [diff] [blame] | 1943 | err = fib_validate_source(skb, saddr, daddr, tos, |
Cong Wang | 0d5edc6 | 2014-04-15 16:25:35 -0700 | [diff] [blame] | 1944 | 0, dev, in_dev, &itag); |
Eric Dumazet | b5f7e75 | 2010-06-02 12:05:27 +0000 | [diff] [blame] | 1945 | if (err < 0) |
David Ahern | 0d75396 | 2015-09-28 11:10:44 -0700 | [diff] [blame] | 1946 | goto martian_source; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | goto local_input; |
| 1948 | } |
| 1949 | |
Duan Jiong | cd0f0b9 | 2014-02-14 18:26:22 +0800 | [diff] [blame] | 1950 | if (!IN_DEV_FORWARD(in_dev)) { |
| 1951 | err = -EHOSTUNREACH; |
David S. Miller | 251da41 | 2012-06-26 16:27:09 -0700 | [diff] [blame] | 1952 | goto no_route; |
Duan Jiong | cd0f0b9 | 2014-02-14 18:26:22 +0800 | [diff] [blame] | 1953 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | if (res.type != RTN_UNICAST) |
| 1955 | goto martian_destination; |
| 1956 | |
David Ahern | dc33da5 | 2017-01-06 17:39:58 -0800 | [diff] [blame] | 1957 | err = ip_mkroute_input(skb, &res, in_dev, daddr, saddr, tos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | out: return err; |
| 1959 | |
| 1960 | brd_input: |
| 1961 | if (skb->protocol != htons(ETH_P_IP)) |
| 1962 | goto e_inval; |
| 1963 | |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 1964 | if (!ipv4_is_zeronet(saddr)) { |
David S. Miller | 9e56e38 | 2012-06-28 18:54:02 -0700 | [diff] [blame] | 1965 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
| 1966 | in_dev, &itag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | if (err < 0) |
David Ahern | 0d75396 | 2015-09-28 11:10:44 -0700 | [diff] [blame] | 1968 | goto martian_source; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | } |
| 1970 | flags |= RTCF_BROADCAST; |
| 1971 | res.type = RTN_BROADCAST; |
| 1972 | RT_CACHE_STAT_INC(in_brd); |
| 1973 | |
| 1974 | local_input: |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1975 | do_cache = false; |
| 1976 | if (res.fi) { |
David S. Miller | fe3edf4 | 2012-07-23 13:22:20 -0700 | [diff] [blame] | 1977 | if (!itag) { |
Eric Dumazet | 54764bb | 2012-07-31 01:08:23 +0000 | [diff] [blame] | 1978 | rth = rcu_dereference(FIB_RES_NH(res).nh_rth_input); |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1979 | if (rt_cache_valid(rth)) { |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 1980 | skb_dst_set_noref(skb, &rth->dst); |
| 1981 | err = 0; |
| 1982 | goto out; |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1983 | } |
| 1984 | do_cache = true; |
| 1985 | } |
| 1986 | } |
| 1987 | |
David Ahern | f5a0aab | 2016-12-29 15:29:03 -0800 | [diff] [blame] | 1988 | rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev, |
| 1989 | flags | RTCF_LOCAL, res.type, |
David S. Miller | d2d68ba | 2012-07-17 12:58:50 -0700 | [diff] [blame] | 1990 | IN_DEV_CONF_GET(in_dev, NOPOLICY), false, do_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | if (!rth) |
| 1992 | goto e_nobufs; |
| 1993 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1994 | rth->dst.output= ip_rt_bug; |
David S. Miller | cf91166 | 2011-04-28 14:31:47 -0700 | [diff] [blame] | 1995 | #ifdef CONFIG_IP_ROUTE_CLASSID |
| 1996 | rth->dst.tclassid = itag; |
| 1997 | #endif |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 1998 | rth->rt_is_input = 1; |
David Ahern | b7503e0 | 2015-09-02 13:58:35 -0700 | [diff] [blame] | 1999 | if (res.table) |
| 2000 | rth->rt_table_id = res.table->tb_id; |
Roopa Prabhu | 571e722 | 2015-07-21 10:43:47 +0200 | [diff] [blame] | 2001 | |
Duan Jiong | a625486 | 2014-02-17 15:23:43 +0800 | [diff] [blame] | 2002 | RT_CACHE_STAT_INC(in_slow_tot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | if (res.type == RTN_UNREACHABLE) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2004 | rth->dst.input= ip_error; |
| 2005 | rth->dst.error= -err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | rth->rt_flags &= ~RTCF_LOCAL; |
| 2007 | } |
Thomas Graf | efd8570 | 2016-11-30 17:10:09 +0100 | [diff] [blame] | 2008 | |
Alexei Starovoitov | dcdfdf5 | 2013-11-19 19:12:34 -0800 | [diff] [blame] | 2009 | if (do_cache) { |
Thomas Graf | efd8570 | 2016-11-30 17:10:09 +0100 | [diff] [blame] | 2010 | struct fib_nh *nh = &FIB_RES_NH(res); |
| 2011 | |
| 2012 | rth->dst.lwtstate = lwtstate_get(nh->nh_lwtstate); |
| 2013 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { |
| 2014 | WARN_ON(rth->dst.input == lwtunnel_input); |
| 2015 | rth->dst.lwtstate->orig_input = rth->dst.input; |
| 2016 | rth->dst.input = lwtunnel_input; |
| 2017 | } |
| 2018 | |
| 2019 | if (unlikely(!rt_cache_route(nh, rth))) { |
Alexei Starovoitov | dcdfdf5 | 2013-11-19 19:12:34 -0800 | [diff] [blame] | 2020 | rth->dst.flags |= DST_NOCACHE; |
| 2021 | rt_add_uncached_list(rth); |
| 2022 | } |
| 2023 | } |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 2024 | skb_dst_set(skb, &rth->dst); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2025 | err = 0; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2026 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | |
| 2028 | no_route: |
| 2029 | RT_CACHE_STAT_INC(in_no_route); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | res.type = RTN_UNREACHABLE; |
Nicolas Cavallari | fa19c2b0 | 2014-10-30 10:09:53 +0100 | [diff] [blame] | 2031 | res.fi = NULL; |
David Ahern | bde6f9d | 2015-09-16 10:16:39 -0600 | [diff] [blame] | 2032 | res.table = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | goto local_input; |
| 2034 | |
| 2035 | /* |
| 2036 | * Do not cache martian addresses: they should be logged (RFC1812) |
| 2037 | */ |
| 2038 | martian_destination: |
| 2039 | RT_CACHE_STAT_INC(in_martian_dst); |
| 2040 | #ifdef CONFIG_IP_ROUTE_VERBOSE |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 2041 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
| 2042 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", |
| 2043 | &daddr, &saddr, dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | #endif |
Dietmar Eggemann | 2c2910a | 2005-06-28 13:06:23 -0700 | [diff] [blame] | 2045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | e_inval: |
| 2047 | err = -EINVAL; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2048 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | |
| 2050 | e_nobufs: |
| 2051 | err = -ENOBUFS; |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2052 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | |
| 2054 | martian_source: |
| 2055 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2056 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | } |
| 2058 | |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 2059 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
| 2060 | u8 tos, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2062 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | |
Julian Anastasov | 6e28099 | 2017-02-26 17:14:35 +0200 | [diff] [blame] | 2064 | tos &= IPTOS_RT_MASK; |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2065 | rcu_read_lock(); |
| 2066 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | /* Multicast recognition logic is moved from route cache to here. |
| 2068 | The problem was that too many Ethernet cards have broken/missing |
| 2069 | hardware multicast filters :-( As result the host on multicasting |
| 2070 | network acquires a lot of useless route cache entries, sort of |
| 2071 | SDR messages from all the world. Now we try to get rid of them. |
| 2072 | Really, provided software IP multicast filter is organized |
| 2073 | reasonably (at least, hashed), it does not result in a slowdown |
| 2074 | comparing with route cache reject entries. |
| 2075 | Note, that multicast routers are not affected, because |
| 2076 | route cache entry is created eventually. |
| 2077 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 2078 | if (ipv4_is_multicast(daddr)) { |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2079 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
David Ahern | e58e415 | 2016-10-31 15:54:00 -0700 | [diff] [blame] | 2080 | int our = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | |
David Ahern | e58e415 | 2016-10-31 15:54:00 -0700 | [diff] [blame] | 2082 | if (in_dev) |
| 2083 | our = ip_check_mc_rcu(in_dev, daddr, saddr, |
| 2084 | ip_hdr(skb)->protocol); |
| 2085 | |
| 2086 | /* check l3 master if no match yet */ |
| 2087 | if ((!in_dev || !our) && netif_is_l3_slave(dev)) { |
| 2088 | struct in_device *l3_in_dev; |
| 2089 | |
| 2090 | l3_in_dev = __in_dev_get_rcu(skb->dev); |
| 2091 | if (l3_in_dev) |
| 2092 | our = ip_check_mc_rcu(l3_in_dev, daddr, saddr, |
| 2093 | ip_hdr(skb)->protocol); |
| 2094 | } |
| 2095 | |
| 2096 | res = -EINVAL; |
| 2097 | if (our |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | #ifdef CONFIG_IP_MROUTE |
David Ahern | e58e415 | 2016-10-31 15:54:00 -0700 | [diff] [blame] | 2099 | || |
| 2100 | (!ipv4_is_local_multicast(daddr) && |
| 2101 | IN_DEV_MFORWARD(in_dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | #endif |
David Ahern | e58e415 | 2016-10-31 15:54:00 -0700 | [diff] [blame] | 2103 | ) { |
| 2104 | res = ip_route_input_mc(skb, daddr, saddr, |
| 2105 | tos, dev, our); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | } |
| 2107 | rcu_read_unlock(); |
David Ahern | e58e415 | 2016-10-31 15:54:00 -0700 | [diff] [blame] | 2108 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | } |
David S. Miller | c10237e | 2012-06-27 17:05:06 -0700 | [diff] [blame] | 2110 | res = ip_route_input_slow(skb, daddr, saddr, tos, dev); |
Eric Dumazet | 96d3622 | 2010-06-02 19:21:31 +0000 | [diff] [blame] | 2111 | rcu_read_unlock(); |
| 2112 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | } |
David S. Miller | c6cffba | 2012-07-26 11:14:38 +0000 | [diff] [blame] | 2114 | EXPORT_SYMBOL(ip_route_input_noref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | |
Eric Dumazet | ebc0ffa | 2010-10-05 10:41:36 +0000 | [diff] [blame] | 2116 | /* called with rcu_read_lock() */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2117 | static struct rtable *__mkroute_output(const struct fib_result *res, |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2118 | const struct flowi4 *fl4, int orig_oif, |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 2119 | struct net_device *dev_out, |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2120 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | { |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2122 | struct fib_info *fi = res->fi; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 2123 | struct fib_nh_exception *fnhe; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2124 | struct in_device *in_dev; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2125 | u16 type = res->type; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2126 | struct rtable *rth; |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2127 | bool do_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 2129 | in_dev = __in_dev_get_rcu(dev_out); |
| 2130 | if (!in_dev) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2131 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 2133 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
David Ahern | 5f02ce24 | 2016-09-10 12:09:54 -0700 | [diff] [blame] | 2134 | if (ipv4_is_loopback(fl4->saddr) && |
| 2135 | !(dev_out->flags & IFF_LOOPBACK) && |
| 2136 | !netif_is_l3_master(dev_out)) |
Thomas Graf | d0daebc3 | 2012-06-12 00:44:01 +0000 | [diff] [blame] | 2137 | return ERR_PTR(-EINVAL); |
| 2138 | |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2139 | if (ipv4_is_lbcast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2140 | type = RTN_BROADCAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2141 | else if (ipv4_is_multicast(fl4->daddr)) |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2142 | type = RTN_MULTICAST; |
David S. Miller | 68a5e3d | 2011-03-11 20:07:33 -0500 | [diff] [blame] | 2143 | else if (ipv4_is_zeronet(fl4->daddr)) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2144 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | |
| 2146 | if (dev_out->flags & IFF_LOOPBACK) |
| 2147 | flags |= RTCF_LOCAL; |
| 2148 | |
Julian Anastasov | 6361742 | 2012-11-22 23:04:14 +0200 | [diff] [blame] | 2149 | do_cache = true; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2150 | if (type == RTN_BROADCAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2152 | fi = NULL; |
| 2153 | } else if (type == RTN_MULTICAST) { |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 2154 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2155 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
| 2156 | fl4->flowi4_proto)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | flags &= ~RTCF_LOCAL; |
Julian Anastasov | 6361742 | 2012-11-22 23:04:14 +0200 | [diff] [blame] | 2158 | else |
| 2159 | do_cache = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | /* If multicast route do not exist use |
Eric Dumazet | dd28d1a | 2010-09-29 11:53:50 +0000 | [diff] [blame] | 2161 | * default one, but do not gateway in this case. |
| 2162 | * Yes, it is hack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | */ |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2164 | if (fi && res->prefixlen < 4) |
| 2165 | fi = NULL; |
Chris Friesen | d6d5e99 | 2016-04-08 15:21:30 -0600 | [diff] [blame] | 2166 | } else if ((type == RTN_LOCAL) && (orig_oif != 0) && |
| 2167 | (orig_oif != dev_out->ifindex)) { |
| 2168 | /* For local routes that require a particular output interface |
| 2169 | * we do not want to cache the result. Caching the result |
| 2170 | * causes incorrect behaviour when there are multiple source |
| 2171 | * addresses on the interface, the end result being that if the |
| 2172 | * intended recipient is waiting on that interface for the |
| 2173 | * packet he won't receive it because it will be delivered on |
| 2174 | * the loopback interface and the IP_PKTINFO ipi_ifindex will |
| 2175 | * be set to the loopback interface as well. |
| 2176 | */ |
| 2177 | fi = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | } |
| 2179 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 2180 | fnhe = NULL; |
Julian Anastasov | 6361742 | 2012-11-22 23:04:14 +0200 | [diff] [blame] | 2181 | do_cache &= fi != NULL; |
| 2182 | if (do_cache) { |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 2183 | struct rtable __rcu **prth; |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2184 | struct fib_nh *nh = &FIB_RES_NH(*res); |
Eric Dumazet | d26b3a7 | 2012-07-31 05:45:30 +0000 | [diff] [blame] | 2185 | |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2186 | fnhe = find_exception(nh, fl4->daddr); |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 2187 | if (fnhe) { |
Timo Teräs | 2ffae99 | 2013-06-27 10:27:05 +0300 | [diff] [blame] | 2188 | prth = &fnhe->fnhe_rth_output; |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 2189 | rth = rcu_dereference(*prth); |
| 2190 | if (rth && rth->dst.expires && |
| 2191 | time_after(jiffies, rth->dst.expires)) { |
| 2192 | ip_del_fnhe(nh, fl4->daddr); |
| 2193 | fnhe = NULL; |
| 2194 | } else { |
| 2195 | goto rt_cache; |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2196 | } |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2197 | } |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 2198 | |
| 2199 | if (unlikely(fl4->flowi4_flags & |
| 2200 | FLOWI_FLAG_KNOWN_NH && |
| 2201 | !(nh->nh_gw && |
| 2202 | nh->nh_scope == RT_SCOPE_LINK))) { |
| 2203 | do_cache = false; |
| 2204 | goto add; |
| 2205 | } |
| 2206 | prth = raw_cpu_ptr(nh->nh_pcpu_rth_output); |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 2207 | rth = rcu_dereference(*prth); |
Xin Long | deed49d | 2016-02-18 21:21:19 +0800 | [diff] [blame] | 2208 | |
| 2209 | rt_cache: |
David S. Miller | c5038a8 | 2012-07-31 15:02:02 -0700 | [diff] [blame] | 2210 | if (rt_cache_valid(rth)) { |
| 2211 | dst_hold(&rth->dst); |
| 2212 | return rth; |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 2213 | } |
| 2214 | } |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2215 | |
| 2216 | add: |
David Ahern | d08c4f3 | 2015-09-02 13:58:34 -0700 | [diff] [blame] | 2217 | rth = rt_dst_alloc(dev_out, flags, type, |
David S. Miller | 5c1e6aa | 2011-04-28 14:13:38 -0700 | [diff] [blame] | 2218 | IN_DEV_CONF_GET(in_dev, NOPOLICY), |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 2219 | IN_DEV_CONF_GET(in_dev, NOXFRM), |
Julian Anastasov | c92b965 | 2012-10-08 11:41:19 +0000 | [diff] [blame] | 2220 | do_cache); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 2221 | if (!rth) |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2222 | return ERR_PTR(-ENOBUFS); |
Dimitris Michailidis | 8391d07 | 2010-10-07 14:48:38 +0000 | [diff] [blame] | 2223 | |
David S. Miller | 13378ca | 2012-07-23 13:57:45 -0700 | [diff] [blame] | 2224 | rth->rt_iif = orig_oif ? : 0; |
David Ahern | b7503e0 | 2015-09-02 13:58:35 -0700 | [diff] [blame] | 2225 | if (res->table) |
| 2226 | rth->rt_table_id = res->table->tb_id; |
| 2227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | RT_CACHE_STAT_INC(out_slow_tot); |
| 2229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2231 | if (flags & RTCF_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | !(dev_out->flags & IFF_LOOPBACK)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2233 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | RT_CACHE_STAT_INC(out_slow_mc); |
| 2235 | } |
| 2236 | #ifdef CONFIG_IP_MROUTE |
David S. Miller | 982721f | 2011-02-16 21:44:24 -0800 | [diff] [blame] | 2237 | if (type == RTN_MULTICAST) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | if (IN_DEV_MFORWARD(in_dev) && |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2239 | !ipv4_is_local_multicast(fl4->daddr)) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2240 | rth->dst.input = ip_mr_input; |
| 2241 | rth->dst.output = ip_mc_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | } |
| 2243 | } |
| 2244 | #endif |
| 2245 | } |
| 2246 | |
David S. Miller | f2bb4be | 2012-07-17 12:20:47 -0700 | [diff] [blame] | 2247 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0); |
Thomas Graf | efd8570 | 2016-11-30 17:10:09 +0100 | [diff] [blame] | 2248 | set_lwt_redirect(rth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2250 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | } |
| 2252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | /* |
| 2254 | * Major route resolver routine. |
| 2255 | */ |
| 2256 | |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 2257 | struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4, |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 2258 | const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | struct net_device *dev_out = NULL; |
Julian Anastasov | f61759e | 2011-12-02 11:39:42 +0000 | [diff] [blame] | 2261 | __u8 tos = RT_FL_TOS(fl4); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2262 | unsigned int flags = 0; |
| 2263 | struct fib_result res; |
David S. Miller | 5ada552 | 2011-02-17 15:29:00 -0800 | [diff] [blame] | 2264 | struct rtable *rth; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2265 | int orig_oif; |
Nikola ForrĂ³ | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 2266 | int err = -ENETUNREACH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | |
David S. Miller | 85b91b0 | 2012-07-13 08:21:29 -0700 | [diff] [blame] | 2268 | res.tclassid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | res.fi = NULL; |
David S. Miller | 8b96d22 | 2012-06-11 02:01:56 -0700 | [diff] [blame] | 2270 | res.table = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2272 | orig_oif = fl4->flowi4_oif; |
| 2273 | |
Pavel Emelyanov | 1fb9489 | 2012-08-08 21:53:36 +0000 | [diff] [blame] | 2274 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2275 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; |
| 2276 | fl4->flowi4_scope = ((tos & RTO_ONLINK) ? |
| 2277 | RT_SCOPE_LINK : RT_SCOPE_UNIVERSE); |
David S. Miller | 44713b6 | 2011-03-04 21:24:47 -0800 | [diff] [blame] | 2278 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2279 | rcu_read_lock(); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2280 | if (fl4->saddr) { |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2281 | rth = ERR_PTR(-EINVAL); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2282 | if (ipv4_is_multicast(fl4->saddr) || |
| 2283 | ipv4_is_lbcast(fl4->saddr) || |
| 2284 | ipv4_is_zeronet(fl4->saddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | goto out; |
| 2286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | /* I removed check for oif == dev_out->oif here. |
| 2288 | It was wrong for two reasons: |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 2289 | 1. ip_dev_find(net, saddr) can return wrong iface, if saddr |
| 2290 | is assigned to multiple interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | 2. Moreover, we are allowed to send packets with saddr |
| 2292 | of another iface. --ANK |
| 2293 | */ |
| 2294 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2295 | if (fl4->flowi4_oif == 0 && |
| 2296 | (ipv4_is_multicast(fl4->daddr) || |
| 2297 | ipv4_is_lbcast(fl4->daddr))) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2298 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2299 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2300 | if (!dev_out) |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2301 | goto out; |
| 2302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | /* Special hack: user can direct multicasts |
| 2304 | and limited broadcast via necessary interface |
| 2305 | without fiddling with IP_MULTICAST_IF or IP_PKTINFO. |
| 2306 | This hack is not just for fun, it allows |
| 2307 | vic,vat and friends to work. |
| 2308 | They bind socket to loopback, set ttl to zero |
| 2309 | and expect that it will work. |
| 2310 | From the viewpoint of routing cache they are broken, |
| 2311 | because we are not allowed to build multicast path |
| 2312 | with loopback source addr (look, routing cache |
| 2313 | cannot know, that ttl is zero, so that packet |
| 2314 | will not leave this host and route is valid). |
| 2315 | Luckily, this hack is good workaround. |
| 2316 | */ |
| 2317 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2318 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | goto make_route; |
| 2320 | } |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2321 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2322 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2323 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2324 | if (!__ip_dev_find(net, fl4->saddr, false)) |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2325 | goto out; |
Julian Anastasov | a210d01 | 2008-10-01 07:28:28 -0700 | [diff] [blame] | 2326 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | } |
| 2328 | |
| 2329 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2330 | if (fl4->flowi4_oif) { |
| 2331 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2332 | rth = ERR_PTR(-ENODEV); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2333 | if (!dev_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | goto out; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 2335 | |
| 2336 | /* RACE: Check return value of inet_select_addr instead. */ |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 2337 | 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] | 2338 | rth = ERR_PTR(-ENETUNREACH); |
Eric Dumazet | fc75fc8 | 2010-12-22 04:39:39 +0000 | [diff] [blame] | 2339 | goto out; |
| 2340 | } |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2341 | if (ipv4_is_local_multicast(fl4->daddr) || |
Andrew Lunn | 6a21165 | 2015-05-01 16:39:54 +0200 | [diff] [blame] | 2342 | ipv4_is_lbcast(fl4->daddr) || |
| 2343 | fl4->flowi4_proto == IPPROTO_IGMP) { |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2344 | if (!fl4->saddr) |
| 2345 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2346 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | goto make_route; |
| 2348 | } |
Jiri Benc | 0a7e226 | 2013-10-04 17:04:48 +0200 | [diff] [blame] | 2349 | if (!fl4->saddr) { |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2350 | if (ipv4_is_multicast(fl4->daddr)) |
| 2351 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2352 | fl4->flowi4_scope); |
| 2353 | else if (!fl4->daddr) |
| 2354 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2355 | RT_SCOPE_HOST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | } |
| 2357 | } |
| 2358 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2359 | if (!fl4->daddr) { |
| 2360 | fl4->daddr = fl4->saddr; |
| 2361 | if (!fl4->daddr) |
| 2362 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); |
Denis V. Lunev | b40afd0 | 2008-01-22 22:06:19 -0800 | [diff] [blame] | 2363 | dev_out = net->loopback_dev; |
Pavel Emelyanov | 1fb9489 | 2012-08-08 21:53:36 +0000 | [diff] [blame] | 2364 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | res.type = RTN_LOCAL; |
| 2366 | flags |= RTCF_LOCAL; |
| 2367 | goto make_route; |
| 2368 | } |
| 2369 | |
Nikola ForrĂ³ | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 2370 | err = fib_lookup(net, fl4, &res, 0); |
| 2371 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | res.fi = NULL; |
David S. Miller | 8b96d22 | 2012-06-11 02:01:56 -0700 | [diff] [blame] | 2373 | res.table = NULL; |
David Ahern | 6104e11 | 2016-10-12 13:20:11 -0700 | [diff] [blame] | 2374 | if (fl4->flowi4_oif && |
David Ahern | e58e415 | 2016-10-31 15:54:00 -0700 | [diff] [blame] | 2375 | (ipv4_is_multicast(fl4->daddr) || |
| 2376 | !netif_index_is_l3_master(net, fl4->flowi4_oif))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | /* Apparently, routing tables are wrong. Assume, |
| 2378 | that the destination is on link. |
| 2379 | |
| 2380 | WHY? DW. |
| 2381 | Because we are allowed to send to iface |
| 2382 | even if it has NO routes and NO assigned |
| 2383 | addresses. When oif is specified, routing |
| 2384 | tables are looked up with only one purpose: |
| 2385 | to catch if destination is gatewayed, rather than |
| 2386 | direct. Moreover, if MSG_DONTROUTE is set, |
| 2387 | we send packet, ignoring both routing tables |
| 2388 | and ifaddr state. --ANK |
| 2389 | |
| 2390 | |
| 2391 | We could make it even if oif is unknown, |
| 2392 | likely IPv6, but we do not. |
| 2393 | */ |
| 2394 | |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2395 | if (fl4->saddr == 0) |
| 2396 | fl4->saddr = inet_select_addr(dev_out, 0, |
| 2397 | RT_SCOPE_LINK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | res.type = RTN_UNICAST; |
| 2399 | goto make_route; |
| 2400 | } |
Nikola ForrĂ³ | 0315e38 | 2015-09-17 16:01:32 +0200 | [diff] [blame] | 2401 | rth = ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | goto out; |
| 2403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | |
| 2405 | if (res.type == RTN_LOCAL) { |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2406 | if (!fl4->saddr) { |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2407 | if (res.fi->fib_prefsrc) |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2408 | fl4->saddr = res.fi->fib_prefsrc; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2409 | else |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2410 | fl4->saddr = fl4->daddr; |
Joel Sing | 9fc3bbb | 2011-01-03 20:24:20 +0000 | [diff] [blame] | 2411 | } |
David Ahern | 5f02ce24 | 2016-09-10 12:09:54 -0700 | [diff] [blame] | 2412 | |
| 2413 | /* L3 master device is the loopback for that domain */ |
Robert Shearman | b7c8487 | 2017-04-21 21:34:59 +0100 | [diff] [blame] | 2414 | dev_out = l3mdev_master_dev_rcu(FIB_RES_DEV(res)) ? : |
| 2415 | net->loopback_dev; |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2416 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | flags |= RTCF_LOCAL; |
| 2418 | goto make_route; |
| 2419 | } |
| 2420 | |
Nikolay Aleksandrov | bf4e0a3 | 2017-03-16 15:28:00 +0200 | [diff] [blame] | 2421 | fib_select_path(net, &res, fl4, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | dev_out = FIB_RES_DEV(res); |
David S. Miller | 813b3b5 | 2011-04-28 14:48:42 -0700 | [diff] [blame] | 2424 | fl4->flowi4_oif = dev_out->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | |
| 2426 | |
| 2427 | make_route: |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2428 | rth = __mkroute_output(&res, fl4, orig_oif, dev_out, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
David S. Miller | 010c270 | 2011-02-17 15:37:09 -0800 | [diff] [blame] | 2430 | out: |
| 2431 | rcu_read_unlock(); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2432 | return rth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | } |
Peter Nørlund | 79a1315 | 2015-09-30 10:12:22 +0200 | [diff] [blame] | 2434 | EXPORT_SYMBOL_GPL(__ip_route_output_key_hash); |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2435 | |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2436 | static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie) |
| 2437 | { |
| 2438 | return NULL; |
| 2439 | } |
| 2440 | |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 2441 | static unsigned int ipv4_blackhole_mtu(const struct dst_entry *dst) |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2442 | { |
Steffen Klassert | 618f9bc | 2011-11-23 02:13:31 +0000 | [diff] [blame] | 2443 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
| 2444 | |
| 2445 | return mtu ? : dst->dev->mtu; |
Roland Dreier | ec831ea | 2011-01-31 13:16:00 -0800 | [diff] [blame] | 2446 | } |
| 2447 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 2448 | static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 2449 | struct sk_buff *skb, u32 mtu) |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2450 | { |
| 2451 | } |
| 2452 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 2453 | static void ipv4_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
| 2454 | struct sk_buff *skb) |
David S. Miller | b587ee3 | 2012-07-12 00:39:24 -0700 | [diff] [blame] | 2455 | { |
| 2456 | } |
| 2457 | |
Held Bernhard | 0972ddb | 2011-04-24 22:07:32 +0000 | [diff] [blame] | 2458 | static u32 *ipv4_rt_blackhole_cow_metrics(struct dst_entry *dst, |
| 2459 | unsigned long old) |
| 2460 | { |
| 2461 | return NULL; |
| 2462 | } |
| 2463 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2464 | static struct dst_ops ipv4_dst_blackhole_ops = { |
| 2465 | .family = AF_INET, |
Jianzhao Wang | ae2688d | 2010-09-08 14:35:43 -0700 | [diff] [blame] | 2466 | .check = ipv4_blackhole_dst_check, |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 2467 | .mtu = ipv4_blackhole_mtu, |
Eric Dumazet | 214f45c | 2011-02-18 11:39:01 -0800 | [diff] [blame] | 2468 | .default_advmss = ipv4_default_advmss, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2469 | .update_pmtu = ipv4_rt_blackhole_update_pmtu, |
David S. Miller | b587ee3 | 2012-07-12 00:39:24 -0700 | [diff] [blame] | 2470 | .redirect = ipv4_rt_blackhole_redirect, |
Held Bernhard | 0972ddb | 2011-04-24 22:07:32 +0000 | [diff] [blame] | 2471 | .cow_metrics = ipv4_rt_blackhole_cow_metrics, |
David S. Miller | d3aaeb3 | 2011-07-18 00:40:17 -0700 | [diff] [blame] | 2472 | .neigh_lookup = ipv4_neigh_lookup, |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2473 | }; |
| 2474 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2475 | 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] | 2476 | { |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2477 | struct rtable *ort = (struct rtable *) dst_orig; |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 2478 | struct rtable *rt; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2479 | |
David S. Miller | f5b0a87 | 2012-07-19 12:31:33 -0700 | [diff] [blame] | 2480 | 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] | 2481 | if (rt) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2482 | struct dst_entry *new = &rt->dst; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2483 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2484 | new->__use = 1; |
Herbert Xu | 352e512 | 2007-11-13 21:34:06 -0800 | [diff] [blame] | 2485 | new->input = dst_discard; |
Eric W. Biederman | ede2059 | 2015-10-07 16:48:47 -0500 | [diff] [blame] | 2486 | new->output = dst_discard_out; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2487 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2488 | new->dev = ort->dst.dev; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2489 | if (new->dev) |
| 2490 | dev_hold(new->dev); |
| 2491 | |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 2492 | rt->rt_is_input = ort->rt_is_input; |
David S. Miller | 5e2b61f | 2011-03-04 21:47:09 -0800 | [diff] [blame] | 2493 | rt->rt_iif = ort->rt_iif; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 2494 | rt->rt_pmtu = ort->rt_pmtu; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2495 | |
fan.du | ca4c3fc | 2013-07-30 08:33:53 +0800 | [diff] [blame] | 2496 | rt->rt_genid = rt_genid_ipv4(net); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2497 | rt->rt_flags = ort->rt_flags; |
| 2498 | rt->rt_type = ort->rt_type; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2499 | rt->rt_gateway = ort->rt_gateway; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 2500 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2501 | |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 2502 | INIT_LIST_HEAD(&rt->rt_uncached); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2503 | dst_free(new); |
| 2504 | } |
| 2505 | |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 2506 | dst_release(dst_orig); |
| 2507 | |
| 2508 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 2509 | } |
| 2510 | |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2511 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
Eric Dumazet | 6f9c961 | 2015-09-25 07:39:10 -0700 | [diff] [blame] | 2512 | const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2513 | { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2514 | struct rtable *rt = __ip_route_output_key(net, flp4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2516 | if (IS_ERR(rt)) |
| 2517 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | |
David S. Miller | 5615787 | 2011-05-02 14:37:45 -0700 | [diff] [blame] | 2519 | if (flp4->flowi4_proto) |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 2520 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
| 2521 | flowi4_to_flowi(flp4), |
| 2522 | sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2523 | |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2524 | return rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2525 | } |
Arnaldo Carvalho de Melo | d8c97a9 | 2005-08-09 20:12:12 -0700 | [diff] [blame] | 2526 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
| 2527 | |
David Ahern | c36ba66 | 2015-09-02 13:58:36 -0700 | [diff] [blame] | 2528 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2529 | struct flowi4 *fl4, struct sk_buff *skb, u32 portid, |
David Ahern | 0c8d803 | 2017-01-05 19:32:46 -0800 | [diff] [blame] | 2530 | u32 seq, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2531 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2532 | struct rtable *rt = skb_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2533 | struct rtmsg *r; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2534 | struct nlmsghdr *nlh; |
Steffen Klassert | 2bc8ca4 | 2011-10-11 01:12:02 +0000 | [diff] [blame] | 2535 | unsigned long expires = 0; |
David S. Miller | f185071 | 2012-07-10 07:26:01 -0700 | [diff] [blame] | 2536 | u32 error; |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2537 | u32 metrics[RTAX_MAX]; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2538 | |
David Ahern | 0c8d803 | 2017-01-05 19:32:46 -0800 | [diff] [blame] | 2539 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), 0); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2540 | if (!nlh) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2541 | return -EMSGSIZE; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2542 | |
| 2543 | r = nlmsg_data(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2544 | r->rtm_family = AF_INET; |
| 2545 | r->rtm_dst_len = 32; |
| 2546 | r->rtm_src_len = 0; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2547 | r->rtm_tos = fl4->flowi4_tos; |
David Ahern | 8a430ed | 2017-01-11 15:42:17 -0800 | [diff] [blame] | 2548 | r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT; |
David Ahern | c36ba66 | 2015-09-02 13:58:36 -0700 | [diff] [blame] | 2549 | if (nla_put_u32(skb, RTA_TABLE, table_id)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2550 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | r->rtm_type = rt->rt_type; |
| 2552 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2553 | r->rtm_protocol = RTPROT_UNSPEC; |
| 2554 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
| 2555 | if (rt->rt_flags & RTCF_NOTIFY) |
| 2556 | r->rtm_flags |= RTM_F_NOTIFY; |
Hannes Frederic Sowa | df4d925 | 2015-01-23 12:01:26 +0100 | [diff] [blame] | 2557 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
| 2558 | r->rtm_flags |= RTCF_DOREDIRECT; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2559 | |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 2560 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2561 | goto nla_put_failure; |
David Miller | 1a00fee | 2012-07-01 02:02:56 +0000 | [diff] [blame] | 2562 | if (src) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | r->rtm_src_len = 32; |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 2564 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2565 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | } |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2567 | if (rt->dst.dev && |
| 2568 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
| 2569 | goto nla_put_failure; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2570 | #ifdef CONFIG_IP_ROUTE_CLASSID |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2571 | if (rt->dst.tclassid && |
| 2572 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) |
| 2573 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | #endif |
David S. Miller | 41347dc | 2012-06-28 04:05:27 -0700 | [diff] [blame] | 2575 | if (!rt_is_input_route(rt) && |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2576 | fl4->saddr != src) { |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 2577 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2578 | goto nla_put_failure; |
| 2579 | } |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 2580 | if (rt->rt_uses_gateway && |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 2581 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gateway)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2582 | goto nla_put_failure; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2583 | |
Steffen Klassert | ee9a8f7 | 2012-10-08 00:56:54 +0000 | [diff] [blame] | 2584 | expires = rt->dst.expires; |
| 2585 | if (expires) { |
| 2586 | unsigned long now = jiffies; |
| 2587 | |
| 2588 | if (time_before(now, expires)) |
| 2589 | expires -= now; |
| 2590 | else |
| 2591 | expires = 0; |
| 2592 | } |
| 2593 | |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2594 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
Steffen Klassert | ee9a8f7 | 2012-10-08 00:56:54 +0000 | [diff] [blame] | 2595 | if (rt->rt_pmtu && expires) |
Julian Anastasov | 521f549 | 2012-07-20 12:02:08 +0300 | [diff] [blame] | 2596 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
| 2597 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2598 | goto nla_put_failure; |
| 2599 | |
David Miller | b486988 | 2012-07-01 02:03:01 +0000 | [diff] [blame] | 2600 | if (fl4->flowi4_mark && |
stephen hemminger | 68aaed5 | 2012-10-10 08:27:25 +0000 | [diff] [blame] | 2601 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 2602 | goto nla_put_failure; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2603 | |
Lorenzo Colitti | 622ec2c | 2016-11-04 02:23:42 +0900 | [diff] [blame] | 2604 | if (!uid_eq(fl4->flowi4_uid, INVALID_UID) && |
| 2605 | nla_put_u32(skb, RTA_UID, |
| 2606 | from_kuid_munged(current_user_ns(), fl4->flowi4_uid))) |
| 2607 | goto nla_put_failure; |
| 2608 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2609 | error = rt->dst.error; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2610 | |
David S. Miller | c753796 | 2010-11-11 17:07:48 -0800 | [diff] [blame] | 2611 | if (rt_is_input_route(rt)) { |
Nicolas Dichtel | 8caaf7b | 2012-12-04 01:03:07 +0000 | [diff] [blame] | 2612 | #ifdef CONFIG_IP_MROUTE |
| 2613 | if (ipv4_is_multicast(dst) && !ipv4_is_local_multicast(dst) && |
| 2614 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)) { |
| 2615 | int err = ipmr_get_route(net, skb, |
| 2616 | fl4->saddr, fl4->daddr, |
David Ahern | 9f09eae | 2017-01-06 17:39:06 -0800 | [diff] [blame] | 2617 | r, portid); |
Nikolay Aleksandrov | 2cf7507 | 2016-09-25 23:08:31 +0200 | [diff] [blame] | 2618 | |
Nicolas Dichtel | 8caaf7b | 2012-12-04 01:03:07 +0000 | [diff] [blame] | 2619 | if (err <= 0) { |
David Ahern | 0c8d803 | 2017-01-05 19:32:46 -0800 | [diff] [blame] | 2620 | if (err == 0) |
| 2621 | return 0; |
| 2622 | goto nla_put_failure; |
Nicolas Dichtel | 8caaf7b | 2012-12-04 01:03:07 +0000 | [diff] [blame] | 2623 | } |
| 2624 | } else |
| 2625 | #endif |
Julian Anastasov | 9114615 | 2014-04-13 18:08:02 +0300 | [diff] [blame] | 2626 | if (nla_put_u32(skb, RTA_IIF, skb->dev->ifindex)) |
Nicolas Dichtel | 8caaf7b | 2012-12-04 01:03:07 +0000 | [diff] [blame] | 2627 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | } |
| 2629 | |
David S. Miller | f185071 | 2012-07-10 07:26:01 -0700 | [diff] [blame] | 2630 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
Thomas Graf | e3703b3 | 2006-11-27 09:27:07 -0800 | [diff] [blame] | 2631 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | |
Johannes Berg | 053c095 | 2015-01-16 22:09:00 +0100 | [diff] [blame] | 2633 | nlmsg_end(skb, nlh); |
| 2634 | return 0; |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 2635 | |
| 2636 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2637 | nlmsg_cancel(skb, nlh); |
| 2638 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | } |
| 2640 | |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 2641 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
| 2642 | struct netlink_ext_ack *extack) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2644 | struct net *net = sock_net(in_skb->sk); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2645 | struct rtmsg *rtm; |
| 2646 | struct nlattr *tb[RTA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2647 | struct rtable *rt = NULL; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2648 | struct flowi4 fl4; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 2649 | __be32 dst = 0; |
| 2650 | __be32 src = 0; |
| 2651 | u32 iif; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2652 | int err; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2653 | int mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | struct sk_buff *skb; |
David Ahern | c36ba66 | 2015-09-02 13:58:36 -0700 | [diff] [blame] | 2655 | u32 table_id = RT_TABLE_MAIN; |
Lorenzo Colitti | 622ec2c | 2016-11-04 02:23:42 +0900 | [diff] [blame] | 2656 | kuid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | |
Johannes Berg | fceb643 | 2017-04-12 14:34:07 +0200 | [diff] [blame] | 2658 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy, |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 2659 | extack); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2660 | if (err < 0) |
| 2661 | goto errout; |
| 2662 | |
| 2663 | rtm = nlmsg_data(nlh); |
| 2664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2666 | if (!skb) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2667 | err = -ENOBUFS; |
| 2668 | goto errout; |
| 2669 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | |
| 2671 | /* Reserve room for dummy headers, this skb can pass |
| 2672 | through good chunk of routing engine. |
| 2673 | */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 2674 | skb_reset_mac_header(skb); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 2675 | skb_reset_network_header(skb); |
Stephen Hemminger | d2c962b | 2006-04-17 17:27:11 -0700 | [diff] [blame] | 2676 | |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 2677 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
| 2678 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2679 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2680 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
Lorenzo Colitti | 622ec2c | 2016-11-04 02:23:42 +0900 | [diff] [blame] | 2681 | if (tb[RTA_UID]) |
| 2682 | uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID])); |
| 2683 | else |
| 2684 | uid = (iif ? INVALID_UID : current_uid()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2685 | |
Florian Larysch | bbadb9a | 2017-04-07 14:42:20 +0200 | [diff] [blame] | 2686 | /* Bugfix: need to give ip_route_input enough of an IP header to |
| 2687 | * not gag. |
| 2688 | */ |
| 2689 | ip_hdr(skb)->protocol = IPPROTO_UDP; |
| 2690 | ip_hdr(skb)->saddr = src; |
| 2691 | ip_hdr(skb)->daddr = dst; |
| 2692 | |
| 2693 | skb_reserve(skb, MAX_HEADER + sizeof(struct iphdr)); |
| 2694 | |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2695 | memset(&fl4, 0, sizeof(fl4)); |
| 2696 | fl4.daddr = dst; |
| 2697 | fl4.saddr = src; |
| 2698 | fl4.flowi4_tos = rtm->rtm_tos; |
| 2699 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; |
| 2700 | fl4.flowi4_mark = mark; |
Lorenzo Colitti | 622ec2c | 2016-11-04 02:23:42 +0900 | [diff] [blame] | 2701 | fl4.flowi4_uid = uid; |
David Miller | d6c0a4f | 2012-07-01 02:02:59 +0000 | [diff] [blame] | 2702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2703 | if (iif) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2704 | struct net_device *dev; |
| 2705 | |
Denis V. Lunev | 1937504 | 2008-02-28 20:52:04 -0800 | [diff] [blame] | 2706 | dev = __dev_get_by_index(net, iif); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2707 | if (!dev) { |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2708 | err = -ENODEV; |
| 2709 | goto errout_free; |
| 2710 | } |
| 2711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | skb->protocol = htons(ETH_P_IP); |
| 2713 | skb->dev = dev; |
Eric Dumazet | 963bfee | 2010-07-20 22:03:14 +0000 | [diff] [blame] | 2714 | skb->mark = mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | err = ip_route_input(skb, dst, src, rtm->rtm_tos, dev); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2716 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 2717 | rt = skb_rtable(skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2718 | if (err == 0 && rt->dst.error) |
| 2719 | err = -rt->dst.error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | } else { |
David S. Miller | 9d6ec93 | 2011-03-12 01:12:47 -0500 | [diff] [blame] | 2721 | rt = ip_route_output_key(net, &fl4); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 2722 | |
| 2723 | err = 0; |
| 2724 | if (IS_ERR(rt)) |
| 2725 | err = PTR_ERR(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | } |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2728 | if (err) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2729 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 2731 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2732 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
| 2733 | rt->rt_flags |= RTCF_NOTIFY; |
| 2734 | |
David Ahern | c36ba66 | 2015-09-02 13:58:36 -0700 | [diff] [blame] | 2735 | if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE) |
| 2736 | table_id = rt->rt_table_id; |
| 2737 | |
| 2738 | err = rt_fill_info(net, dst, src, table_id, &fl4, skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2739 | NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
David Ahern | 0c8d803 | 2017-01-05 19:32:46 -0800 | [diff] [blame] | 2740 | RTM_NEWROUTE); |
David S. Miller | 7b46a64 | 2015-01-18 23:36:08 -0500 | [diff] [blame] | 2741 | if (err < 0) |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2742 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2744 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2745 | errout: |
Thomas Graf | 2942e90 | 2006-08-15 00:30:25 -0700 | [diff] [blame] | 2746 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2748 | errout_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | kfree_skb(skb); |
Thomas Graf | d889ce3 | 2006-08-17 18:15:44 -0700 | [diff] [blame] | 2750 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | } |
| 2752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | void ip_rt_multicast_event(struct in_device *in_dev) |
| 2754 | { |
Nicolas Dichtel | 4ccfe6d | 2012-09-07 00:45:29 +0000 | [diff] [blame] | 2755 | rt_cache_flush(dev_net(in_dev->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2756 | } |
| 2757 | |
| 2758 | #ifdef CONFIG_SYSCTL |
Gao feng | 082c7ca | 2013-02-19 00:43:12 +0000 | [diff] [blame] | 2759 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
| 2760 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; |
| 2761 | static int ip_rt_gc_elasticity __read_mostly = 8; |
| 2762 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2763 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2764 | void __user *buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | size_t *lenp, loff_t *ppos) |
| 2766 | { |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 2767 | struct net *net = (struct net *)__ctl->extra1; |
| 2768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | if (write) { |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 2770 | rt_cache_flush(net); |
| 2771 | fnhe_genid_bump(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2772 | return 0; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2773 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | |
| 2775 | return -EINVAL; |
| 2776 | } |
| 2777 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2778 | static struct ctl_table ipv4_route_table[] = { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2779 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2780 | .procname = "gc_thresh", |
| 2781 | .data = &ipv4_dst_ops.gc_thresh, |
| 2782 | .maxlen = sizeof(int), |
| 2783 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2784 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2785 | }, |
| 2786 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | .procname = "max_size", |
| 2788 | .data = &ip_rt_max_size, |
| 2789 | .maxlen = sizeof(int), |
| 2790 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2791 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | }, |
| 2793 | { |
| 2794 | /* Deprecated. Use gc_min_interval_ms */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2795 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | .procname = "gc_min_interval", |
| 2797 | .data = &ip_rt_gc_min_interval, |
| 2798 | .maxlen = sizeof(int), |
| 2799 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2800 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | }, |
| 2802 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | .procname = "gc_min_interval_ms", |
| 2804 | .data = &ip_rt_gc_min_interval, |
| 2805 | .maxlen = sizeof(int), |
| 2806 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2807 | .proc_handler = proc_dointvec_ms_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2808 | }, |
| 2809 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2810 | .procname = "gc_timeout", |
| 2811 | .data = &ip_rt_gc_timeout, |
| 2812 | .maxlen = sizeof(int), |
| 2813 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2814 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | }, |
| 2816 | { |
Eric Dumazet | 9f28a2f | 2011-12-21 15:47:16 -0500 | [diff] [blame] | 2817 | .procname = "gc_interval", |
| 2818 | .data = &ip_rt_gc_interval, |
| 2819 | .maxlen = sizeof(int), |
| 2820 | .mode = 0644, |
| 2821 | .proc_handler = proc_dointvec_jiffies, |
| 2822 | }, |
| 2823 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | .procname = "redirect_load", |
| 2825 | .data = &ip_rt_redirect_load, |
| 2826 | .maxlen = sizeof(int), |
| 2827 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2828 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2829 | }, |
| 2830 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2831 | .procname = "redirect_number", |
| 2832 | .data = &ip_rt_redirect_number, |
| 2833 | .maxlen = sizeof(int), |
| 2834 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2835 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2836 | }, |
| 2837 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2838 | .procname = "redirect_silence", |
| 2839 | .data = &ip_rt_redirect_silence, |
| 2840 | .maxlen = sizeof(int), |
| 2841 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2842 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2843 | }, |
| 2844 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2845 | .procname = "error_cost", |
| 2846 | .data = &ip_rt_error_cost, |
| 2847 | .maxlen = sizeof(int), |
| 2848 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2849 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | }, |
| 2851 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2852 | .procname = "error_burst", |
| 2853 | .data = &ip_rt_error_burst, |
| 2854 | .maxlen = sizeof(int), |
| 2855 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2856 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | }, |
| 2858 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2859 | .procname = "gc_elasticity", |
| 2860 | .data = &ip_rt_gc_elasticity, |
| 2861 | .maxlen = sizeof(int), |
| 2862 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2863 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | }, |
| 2865 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | .procname = "mtu_expires", |
| 2867 | .data = &ip_rt_mtu_expires, |
| 2868 | .maxlen = sizeof(int), |
| 2869 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2870 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2871 | }, |
| 2872 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | .procname = "min_pmtu", |
| 2874 | .data = &ip_rt_min_pmtu, |
| 2875 | .maxlen = sizeof(int), |
| 2876 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2877 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2878 | }, |
| 2879 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2880 | .procname = "min_adv_mss", |
| 2881 | .data = &ip_rt_min_advmss, |
| 2882 | .maxlen = sizeof(int), |
| 2883 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2884 | .proc_handler = proc_dointvec, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2886 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | }; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2888 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2889 | static struct ctl_table ipv4_route_flush_table[] = { |
| 2890 | { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2891 | .procname = "flush", |
| 2892 | .maxlen = sizeof(int), |
| 2893 | .mode = 0200, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2894 | .proc_handler = ipv4_sysctl_rtcache_flush, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2895 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2896 | { }, |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2897 | }; |
| 2898 | |
| 2899 | static __net_init int sysctl_route_net_init(struct net *net) |
| 2900 | { |
| 2901 | struct ctl_table *tbl; |
| 2902 | |
| 2903 | tbl = ipv4_route_flush_table; |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2904 | if (!net_eq(net, &init_net)) { |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2905 | tbl = kmemdup(tbl, sizeof(ipv4_route_flush_table), GFP_KERNEL); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2906 | if (!tbl) |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2907 | goto err_dup; |
Eric W. Biederman | 464dc80 | 2012-11-16 03:02:59 +0000 | [diff] [blame] | 2908 | |
| 2909 | /* Don't export sysctls to unprivileged users */ |
| 2910 | if (net->user_ns != &init_user_ns) |
| 2911 | tbl[0].procname = NULL; |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2912 | } |
| 2913 | tbl[0].extra1 = net; |
| 2914 | |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 2915 | net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 2916 | if (!net->ipv4.route_hdr) |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 2917 | goto err_reg; |
| 2918 | return 0; |
| 2919 | |
| 2920 | err_reg: |
| 2921 | if (tbl != ipv4_route_flush_table) |
| 2922 | kfree(tbl); |
| 2923 | err_dup: |
| 2924 | return -ENOMEM; |
| 2925 | } |
| 2926 | |
| 2927 | static __net_exit void sysctl_route_net_exit(struct net *net) |
| 2928 | { |
| 2929 | struct ctl_table *tbl; |
| 2930 | |
| 2931 | tbl = net->ipv4.route_hdr->ctl_table_arg; |
| 2932 | unregister_net_sysctl_table(net->ipv4.route_hdr); |
| 2933 | BUG_ON(tbl == ipv4_route_flush_table); |
| 2934 | kfree(tbl); |
| 2935 | } |
| 2936 | |
| 2937 | static __net_initdata struct pernet_operations sysctl_route_ops = { |
| 2938 | .init = sysctl_route_net_init, |
| 2939 | .exit = sysctl_route_net_exit, |
| 2940 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2941 | #endif |
| 2942 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2943 | static __net_init int rt_genid_init(struct net *net) |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2944 | { |
fan.du | ca4c3fc | 2013-07-30 08:33:53 +0800 | [diff] [blame] | 2945 | atomic_set(&net->ipv4.rt_genid, 0); |
Timo Teräs | 5aad1de | 2013-05-27 20:46:33 +0000 | [diff] [blame] | 2946 | atomic_set(&net->fnhe_genid, 0); |
David S. Miller | 436c3b6 | 2011-03-24 17:42:21 -0700 | [diff] [blame] | 2947 | get_random_bytes(&net->ipv4.dev_addr_genid, |
| 2948 | sizeof(net->ipv4.dev_addr_genid)); |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2949 | return 0; |
| 2950 | } |
| 2951 | |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 2952 | static __net_initdata struct pernet_operations rt_genid_ops = { |
| 2953 | .init = rt_genid_init, |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2954 | }; |
| 2955 | |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2956 | static int __net_init ipv4_inetpeer_init(struct net *net) |
| 2957 | { |
| 2958 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); |
| 2959 | |
| 2960 | if (!bp) |
| 2961 | return -ENOMEM; |
| 2962 | inet_peer_base_init(bp); |
| 2963 | net->ipv4.peers = bp; |
| 2964 | return 0; |
| 2965 | } |
| 2966 | |
| 2967 | static void __net_exit ipv4_inetpeer_exit(struct net *net) |
| 2968 | { |
| 2969 | struct inet_peer_base *bp = net->ipv4.peers; |
| 2970 | |
| 2971 | net->ipv4.peers = NULL; |
David S. Miller | 56a6b24 | 2012-06-09 16:32:41 -0700 | [diff] [blame] | 2972 | inetpeer_invalidate_tree(bp); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 2973 | kfree(bp); |
| 2974 | } |
| 2975 | |
| 2976 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { |
| 2977 | .init = ipv4_inetpeer_init, |
| 2978 | .exit = ipv4_inetpeer_exit, |
| 2979 | }; |
Denis V. Lunev | 9f5e97e | 2008-07-05 19:02:59 -0700 | [diff] [blame] | 2980 | |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2981 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Tejun Heo | 7d720c3 | 2010-02-16 15:20:26 +0000 | [diff] [blame] | 2982 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 2983 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | int __init ip_rt_init(void) |
| 2986 | { |
Eric Dumazet | 424c4b7 | 2005-07-05 14:58:19 -0700 | [diff] [blame] | 2987 | int rc = 0; |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 2988 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2989 | |
Eric Dumazet | 73f156a | 2014-06-02 05:26:03 -0700 | [diff] [blame] | 2990 | ip_idents = kmalloc(IP_IDENTS_SZ * sizeof(*ip_idents), GFP_KERNEL); |
| 2991 | if (!ip_idents) |
| 2992 | panic("IP: failed to allocate ip_idents\n"); |
| 2993 | |
| 2994 | prandom_bytes(ip_idents, IP_IDENTS_SZ * sizeof(*ip_idents)); |
| 2995 | |
Eric Dumazet | 355b590 | 2015-05-01 10:37:49 -0700 | [diff] [blame] | 2996 | ip_tstamps = kcalloc(IP_IDENTS_SZ, sizeof(*ip_tstamps), GFP_KERNEL); |
| 2997 | if (!ip_tstamps) |
| 2998 | panic("IP: failed to allocate ip_tstamps\n"); |
| 2999 | |
Eric Dumazet | 5055c37 | 2015-01-14 15:17:06 -0800 | [diff] [blame] | 3000 | for_each_possible_cpu(cpu) { |
| 3001 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); |
| 3002 | |
| 3003 | INIT_LIST_HEAD(&ul->head); |
| 3004 | spin_lock_init(&ul->lock); |
| 3005 | } |
Patrick McHardy | c7066f7 | 2011-01-14 13:36:42 +0100 | [diff] [blame] | 3006 | #ifdef CONFIG_IP_ROUTE_CLASSID |
Ingo Molnar | 0dcec8c | 2009-02-25 14:07:33 +0100 | [diff] [blame] | 3007 | 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] | 3008 | if (!ip_rt_acct) |
| 3009 | panic("IP: failed to allocate ip_rt_acct\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | #endif |
| 3011 | |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 3012 | ipv4_dst_ops.kmem_cachep = |
| 3013 | kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 3014 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 3016 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
| 3017 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 3018 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
| 3019 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); |
| 3020 | |
| 3021 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) |
| 3022 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); |
| 3023 | |
David S. Miller | 89aef89 | 2012-07-17 11:00:09 -0700 | [diff] [blame] | 3024 | ipv4_dst_ops.gc_thresh = ~0; |
| 3025 | ip_rt_max_size = INT_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3027 | devinet_init(); |
| 3028 | ip_fib_init(); |
| 3029 | |
Denis V. Lunev | 73b3871 | 2008-02-28 20:51:18 -0800 | [diff] [blame] | 3030 | if (ip_rt_proc_init()) |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 3031 | pr_err("Unable to create route proc files\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3032 | #ifdef CONFIG_XFRM |
| 3033 | xfrm_init(); |
Steffen Klassert | 703fb94 | 2012-11-13 08:52:24 +0100 | [diff] [blame] | 3034 | xfrm4_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | #endif |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 3036 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL); |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 3037 | |
Denis V. Lunev | 39a23e7 | 2008-07-05 19:02:33 -0700 | [diff] [blame] | 3038 | #ifdef CONFIG_SYSCTL |
| 3039 | register_pernet_subsys(&sysctl_route_ops); |
| 3040 | #endif |
Neil Horman | 3ee9437 | 2010-05-08 01:57:52 -0700 | [diff] [blame] | 3041 | register_pernet_subsys(&rt_genid_ops); |
David S. Miller | c3426b4 | 2012-06-09 16:27:05 -0700 | [diff] [blame] | 3042 | register_pernet_subsys(&ipv4_inetpeer_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | return rc; |
| 3044 | } |
| 3045 | |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 3046 | #ifdef CONFIG_SYSCTL |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 3047 | /* |
| 3048 | * We really need to sanitize the damn ipv4 init order, then all |
| 3049 | * this nonsense will go away. |
| 3050 | */ |
| 3051 | void __init ip_static_sysctl_init(void) |
| 3052 | { |
Eric W. Biederman | 4e5ca78 | 2012-04-19 13:32:39 +0000 | [diff] [blame] | 3053 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
Al Viro | eeb61f7 | 2008-07-27 08:59:33 +0100 | [diff] [blame] | 3054 | } |
Al Viro | a1bc6eb | 2008-07-30 06:32:52 -0400 | [diff] [blame] | 3055 | #endif |