Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 1 | /* linux/net/ipv4/arp.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * Version: $Id: arp.c,v 1.99 2001/08/30 22:55:42 davem Exp $ |
| 4 | * |
| 5 | * Copyright (C) 1994 by Florian La Roche |
| 6 | * |
| 7 | * This module implements the Address Resolution Protocol ARP (RFC 826), |
| 8 | * which is used to convert IP addresses (or in the future maybe other |
| 9 | * high-level addresses) into a low-level hardware address (like an Ethernet |
| 10 | * address). |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | * |
| 17 | * Fixes: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 18 | * Alan Cox : Removed the Ethernet assumptions in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * Florian's code |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 20 | * Alan Cox : Fixed some small errors in the ARP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * logic |
| 22 | * Alan Cox : Allow >4K in /proc |
| 23 | * Alan Cox : Make ARP add its own protocol entry |
| 24 | * Ross Martin : Rewrote arp_rcv() and arp_get_info() |
| 25 | * Stephen Henson : Add AX25 support to arp_get_info() |
| 26 | * Alan Cox : Drop data when a device is downed. |
| 27 | * Alan Cox : Use init_timer(). |
| 28 | * Alan Cox : Double lock fixes. |
| 29 | * Martin Seine : Move the arphdr structure |
| 30 | * to if_arp.h for compatibility. |
| 31 | * with BSD based programs. |
| 32 | * Andrew Tridgell : Added ARP netmask code and |
| 33 | * re-arranged proxy handling. |
| 34 | * Alan Cox : Changed to use notifiers. |
| 35 | * Niibe Yutaka : Reply for this device or proxies only. |
| 36 | * Alan Cox : Don't proxy across hardware types! |
| 37 | * Jonathan Naylor : Added support for NET/ROM. |
| 38 | * Mike Shaver : RFC1122 checks. |
| 39 | * Jonathan Naylor : Only lookup the hardware address for |
| 40 | * the correct hardware type. |
| 41 | * Germano Caronni : Assorted subtle races. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 42 | * Craig Schlenter : Don't modify permanent entry |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | * during arp_rcv. |
| 44 | * Russ Nelson : Tidied up a few bits. |
| 45 | * Alexey Kuznetsov: Major changes to caching and behaviour, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 46 | * eg intelligent arp probing and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * generation |
| 48 | * of host down events. |
| 49 | * Alan Cox : Missing unlock in device events. |
| 50 | * Eckes : ARP ioctl control errors. |
| 51 | * Alexey Kuznetsov: Arp free fix. |
| 52 | * Manuel Rodriguez: Gratuitous ARP. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 53 | * Jonathan Layes : Added arpd support through kerneld |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | * message queue (960314) |
| 55 | * Mike Shaver : /proc/sys/net/ipv4/arp_* support |
| 56 | * Mike McLagan : Routing by source |
| 57 | * Stuart Cheshire : Metricom and grat arp fixes |
| 58 | * *** FOR 2.1 clean this up *** |
| 59 | * Lawrence V. Stefani: (08/12/96) Added FDDI support. |
| 60 | * Alan Cox : Took the AP1000 nasty FDDI hack and |
| 61 | * folded into the mainstream FDDI code. |
| 62 | * Ack spit, Linus how did you allow that |
| 63 | * one in... |
| 64 | * Jes Sorensen : Make FDDI work again in 2.1.x and |
| 65 | * clean up the APFDDI & gen. FDDI bits. |
| 66 | * Alexey Kuznetsov: new arp state machine; |
| 67 | * now it is in net/core/neighbour.c. |
| 68 | * Krzysztof Halasa: Added Frame Relay ARP support. |
| 69 | * Arnaldo C. Melo : convert /proc/net/arp to seq_file |
| 70 | * Shmulik Hen: Split arp_send to arp_create and |
| 71 | * arp_xmit so intermediate drivers like |
| 72 | * bonding can change the skb before |
| 73 | * sending (e.g. insert 8021q tag). |
| 74 | * Harald Welte : convert to make use of jenkins hash |
| 75 | */ |
| 76 | |
| 77 | #include <linux/module.h> |
| 78 | #include <linux/types.h> |
| 79 | #include <linux/string.h> |
| 80 | #include <linux/kernel.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 81 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <linux/socket.h> |
| 83 | #include <linux/sockios.h> |
| 84 | #include <linux/errno.h> |
| 85 | #include <linux/in.h> |
| 86 | #include <linux/mm.h> |
| 87 | #include <linux/inet.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 88 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #include <linux/netdevice.h> |
| 90 | #include <linux/etherdevice.h> |
| 91 | #include <linux/fddidevice.h> |
| 92 | #include <linux/if_arp.h> |
| 93 | #include <linux/trdevice.h> |
| 94 | #include <linux/skbuff.h> |
| 95 | #include <linux/proc_fs.h> |
| 96 | #include <linux/seq_file.h> |
| 97 | #include <linux/stat.h> |
| 98 | #include <linux/init.h> |
| 99 | #include <linux/net.h> |
| 100 | #include <linux/rcupdate.h> |
| 101 | #include <linux/jhash.h> |
| 102 | #ifdef CONFIG_SYSCTL |
| 103 | #include <linux/sysctl.h> |
| 104 | #endif |
| 105 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 106 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #include <net/ip.h> |
| 108 | #include <net/icmp.h> |
| 109 | #include <net/route.h> |
| 110 | #include <net/protocol.h> |
| 111 | #include <net/tcp.h> |
| 112 | #include <net/sock.h> |
| 113 | #include <net/arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #include <net/ax25.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | #include <net/netrom.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE) |
| 117 | #include <net/atmclip.h> |
| 118 | struct neigh_table *clip_tbl_hook; |
| 119 | #endif |
| 120 | |
| 121 | #include <asm/system.h> |
| 122 | #include <asm/uaccess.h> |
| 123 | |
| 124 | #include <linux/netfilter_arp.h> |
| 125 | |
| 126 | /* |
| 127 | * Interface to generic neighbour cache. |
| 128 | */ |
| 129 | static u32 arp_hash(const void *pkey, const struct net_device *dev); |
| 130 | static int arp_constructor(struct neighbour *neigh); |
| 131 | static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb); |
| 132 | static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb); |
| 133 | static void parp_redo(struct sk_buff *skb); |
| 134 | |
| 135 | static struct neigh_ops arp_generic_ops = { |
| 136 | .family = AF_INET, |
| 137 | .solicit = arp_solicit, |
| 138 | .error_report = arp_error_report, |
| 139 | .output = neigh_resolve_output, |
| 140 | .connected_output = neigh_connected_output, |
| 141 | .hh_output = dev_queue_xmit, |
| 142 | .queue_xmit = dev_queue_xmit, |
| 143 | }; |
| 144 | |
| 145 | static struct neigh_ops arp_hh_ops = { |
| 146 | .family = AF_INET, |
| 147 | .solicit = arp_solicit, |
| 148 | .error_report = arp_error_report, |
| 149 | .output = neigh_resolve_output, |
| 150 | .connected_output = neigh_resolve_output, |
| 151 | .hh_output = dev_queue_xmit, |
| 152 | .queue_xmit = dev_queue_xmit, |
| 153 | }; |
| 154 | |
| 155 | static struct neigh_ops arp_direct_ops = { |
| 156 | .family = AF_INET, |
| 157 | .output = dev_queue_xmit, |
| 158 | .connected_output = dev_queue_xmit, |
| 159 | .hh_output = dev_queue_xmit, |
| 160 | .queue_xmit = dev_queue_xmit, |
| 161 | }; |
| 162 | |
| 163 | struct neigh_ops arp_broken_ops = { |
| 164 | .family = AF_INET, |
| 165 | .solicit = arp_solicit, |
| 166 | .error_report = arp_error_report, |
| 167 | .output = neigh_compat_output, |
| 168 | .connected_output = neigh_compat_output, |
| 169 | .hh_output = dev_queue_xmit, |
| 170 | .queue_xmit = dev_queue_xmit, |
| 171 | }; |
| 172 | |
| 173 | struct neigh_table arp_tbl = { |
| 174 | .family = AF_INET, |
| 175 | .entry_size = sizeof(struct neighbour) + 4, |
| 176 | .key_len = 4, |
| 177 | .hash = arp_hash, |
| 178 | .constructor = arp_constructor, |
| 179 | .proxy_redo = parp_redo, |
| 180 | .id = "arp_cache", |
| 181 | .parms = { |
| 182 | .tbl = &arp_tbl, |
| 183 | .base_reachable_time = 30 * HZ, |
| 184 | .retrans_time = 1 * HZ, |
| 185 | .gc_staletime = 60 * HZ, |
| 186 | .reachable_time = 30 * HZ, |
| 187 | .delay_probe_time = 5 * HZ, |
| 188 | .queue_len = 3, |
| 189 | .ucast_probes = 3, |
| 190 | .mcast_probes = 3, |
| 191 | .anycast_delay = 1 * HZ, |
| 192 | .proxy_delay = (8 * HZ) / 10, |
| 193 | .proxy_qlen = 64, |
| 194 | .locktime = 1 * HZ, |
| 195 | }, |
| 196 | .gc_interval = 30 * HZ, |
| 197 | .gc_thresh1 = 128, |
| 198 | .gc_thresh2 = 512, |
| 199 | .gc_thresh3 = 1024, |
| 200 | }; |
| 201 | |
Al Viro | 714e85b | 2006-11-14 20:51:49 -0800 | [diff] [blame] | 202 | int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | { |
| 204 | switch (dev->type) { |
| 205 | case ARPHRD_ETHER: |
| 206 | case ARPHRD_FDDI: |
| 207 | case ARPHRD_IEEE802: |
| 208 | ip_eth_mc_map(addr, haddr); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 209 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | case ARPHRD_IEEE802_TR: |
| 211 | ip_tr_mc_map(addr, haddr); |
| 212 | return 0; |
| 213 | case ARPHRD_INFINIBAND: |
Rolf Manderscheid | a9e527e | 2007-12-10 13:38:41 -0700 | [diff] [blame] | 214 | ip_ib_mc_map(addr, dev->broadcast, haddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | return 0; |
| 216 | default: |
| 217 | if (dir) { |
| 218 | memcpy(haddr, dev->broadcast, dev->addr_len); |
| 219 | return 0; |
| 220 | } |
| 221 | } |
| 222 | return -EINVAL; |
| 223 | } |
| 224 | |
| 225 | |
| 226 | static u32 arp_hash(const void *pkey, const struct net_device *dev) |
| 227 | { |
| 228 | return jhash_2words(*(u32 *)pkey, dev->ifindex, arp_tbl.hash_rnd); |
| 229 | } |
| 230 | |
| 231 | static int arp_constructor(struct neighbour *neigh) |
| 232 | { |
Al Viro | fd68322 | 2006-09-26 22:17:51 -0700 | [diff] [blame] | 233 | __be32 addr = *(__be32*)neigh->primary_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | struct net_device *dev = neigh->dev; |
| 235 | struct in_device *in_dev; |
| 236 | struct neigh_parms *parms; |
| 237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 239 | in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (in_dev == NULL) { |
| 241 | rcu_read_unlock(); |
| 242 | return -EINVAL; |
| 243 | } |
| 244 | |
Denis V. Lunev | a79878f | 2008-01-14 22:56:01 -0800 | [diff] [blame^] | 245 | neigh->type = inet_addr_type(&init_net, addr); |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | parms = in_dev->arp_parms; |
| 248 | __neigh_parms_put(neigh->parms); |
| 249 | neigh->parms = neigh_parms_clone(parms); |
| 250 | rcu_read_unlock(); |
| 251 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 252 | if (!dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | neigh->nud_state = NUD_NOARP; |
| 254 | neigh->ops = &arp_direct_ops; |
| 255 | neigh->output = neigh->ops->queue_xmit; |
| 256 | } else { |
| 257 | /* Good devices (checked by reading texts, but only Ethernet is |
| 258 | tested) |
| 259 | |
| 260 | ARPHRD_ETHER: (ethernet, apfddi) |
| 261 | ARPHRD_FDDI: (fddi) |
| 262 | ARPHRD_IEEE802: (tr) |
| 263 | ARPHRD_METRICOM: (strip) |
| 264 | ARPHRD_ARCNET: |
| 265 | etc. etc. etc. |
| 266 | |
| 267 | ARPHRD_IPDDP will also work, if author repairs it. |
| 268 | I did not it, because this driver does not work even |
| 269 | in old paradigm. |
| 270 | */ |
| 271 | |
| 272 | #if 1 |
| 273 | /* So... these "amateur" devices are hopeless. |
| 274 | The only thing, that I can say now: |
| 275 | It is very sad that we need to keep ugly obsolete |
| 276 | code to make them happy. |
| 277 | |
| 278 | They should be moved to more reasonable state, now |
| 279 | they use rebuild_header INSTEAD OF hard_start_xmit!!! |
| 280 | Besides that, they are sort of out of date |
| 281 | (a lot of redundant clones/copies, useless in 2.1), |
| 282 | I wonder why people believe that they work. |
| 283 | */ |
| 284 | switch (dev->type) { |
| 285 | default: |
| 286 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 287 | case ARPHRD_ROSE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
| 289 | case ARPHRD_AX25: |
| 290 | #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) |
| 291 | case ARPHRD_NETROM: |
| 292 | #endif |
| 293 | neigh->ops = &arp_broken_ops; |
| 294 | neigh->output = neigh->ops->output; |
| 295 | return 0; |
| 296 | #endif |
| 297 | ;} |
| 298 | #endif |
| 299 | if (neigh->type == RTN_MULTICAST) { |
| 300 | neigh->nud_state = NUD_NOARP; |
| 301 | arp_mc_map(addr, neigh->ha, dev, 1); |
| 302 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { |
| 303 | neigh->nud_state = NUD_NOARP; |
| 304 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); |
| 305 | } else if (neigh->type == RTN_BROADCAST || dev->flags&IFF_POINTOPOINT) { |
| 306 | neigh->nud_state = NUD_NOARP; |
| 307 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); |
| 308 | } |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 309 | |
| 310 | if (dev->header_ops->cache) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | neigh->ops = &arp_hh_ops; |
| 312 | else |
| 313 | neigh->ops = &arp_generic_ops; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | if (neigh->nud_state&NUD_VALID) |
| 316 | neigh->output = neigh->ops->connected_output; |
| 317 | else |
| 318 | neigh->output = neigh->ops->output; |
| 319 | } |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb) |
| 324 | { |
| 325 | dst_link_failure(skb); |
| 326 | kfree_skb(skb); |
| 327 | } |
| 328 | |
| 329 | static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) |
| 330 | { |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 331 | __be32 saddr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | u8 *dst_ha = NULL; |
| 333 | struct net_device *dev = neigh->dev; |
Al Viro | a61ced5 | 2006-09-26 21:27:54 -0700 | [diff] [blame] | 334 | __be32 target = *(__be32*)neigh->primary_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | int probes = atomic_read(&neigh->probes); |
| 336 | struct in_device *in_dev = in_dev_get(dev); |
| 337 | |
| 338 | if (!in_dev) |
| 339 | return; |
| 340 | |
| 341 | switch (IN_DEV_ARP_ANNOUNCE(in_dev)) { |
| 342 | default: |
| 343 | case 0: /* By default announce any local IP */ |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 344 | if (skb && inet_addr_type(&init_net, ip_hdr(skb)->saddr) == RTN_LOCAL) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 345 | saddr = ip_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | break; |
| 347 | case 1: /* Restrict announcements of saddr in same subnet */ |
| 348 | if (!skb) |
| 349 | break; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 350 | saddr = ip_hdr(skb)->saddr; |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 351 | if (inet_addr_type(&init_net, saddr) == RTN_LOCAL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* saddr should be known to target */ |
| 353 | if (inet_addr_onlink(in_dev, target, saddr)) |
| 354 | break; |
| 355 | } |
| 356 | saddr = 0; |
| 357 | break; |
| 358 | case 2: /* Avoid secondary IPs, get a primary/preferred one */ |
| 359 | break; |
| 360 | } |
| 361 | |
| 362 | if (in_dev) |
| 363 | in_dev_put(in_dev); |
| 364 | if (!saddr) |
| 365 | saddr = inet_select_addr(dev, target, RT_SCOPE_LINK); |
| 366 | |
| 367 | if ((probes -= neigh->parms->ucast_probes) < 0) { |
| 368 | if (!(neigh->nud_state&NUD_VALID)) |
| 369 | printk(KERN_DEBUG "trying to ucast probe in NUD_INVALID\n"); |
| 370 | dst_ha = neigh->ha; |
| 371 | read_lock_bh(&neigh->lock); |
| 372 | } else if ((probes -= neigh->parms->app_probes) < 0) { |
| 373 | #ifdef CONFIG_ARPD |
| 374 | neigh_app_ns(neigh); |
| 375 | #endif |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr, |
| 380 | dst_ha, dev->dev_addr, NULL); |
| 381 | if (dst_ha) |
| 382 | read_unlock_bh(&neigh->lock); |
| 383 | } |
| 384 | |
| 385 | static int arp_ignore(struct in_device *in_dev, struct net_device *dev, |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 386 | __be32 sip, __be32 tip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
| 388 | int scope; |
| 389 | |
| 390 | switch (IN_DEV_ARP_IGNORE(in_dev)) { |
| 391 | case 0: /* Reply, the tip is already validated */ |
| 392 | return 0; |
| 393 | case 1: /* Reply only if tip is configured on the incoming interface */ |
| 394 | sip = 0; |
| 395 | scope = RT_SCOPE_HOST; |
| 396 | break; |
| 397 | case 2: /* |
| 398 | * Reply only if tip is configured on the incoming interface |
| 399 | * and is in same subnet as sip |
| 400 | */ |
| 401 | scope = RT_SCOPE_HOST; |
| 402 | break; |
| 403 | case 3: /* Do not reply for scope host addresses */ |
| 404 | sip = 0; |
| 405 | scope = RT_SCOPE_LINK; |
| 406 | dev = NULL; |
| 407 | break; |
| 408 | case 4: /* Reserved */ |
| 409 | case 5: |
| 410 | case 6: |
| 411 | case 7: |
| 412 | return 0; |
| 413 | case 8: /* Do not reply */ |
| 414 | return 1; |
| 415 | default: |
| 416 | return 0; |
| 417 | } |
| 418 | return !inet_confirm_addr(dev, sip, tip, scope); |
| 419 | } |
| 420 | |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 421 | static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | { |
| 423 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = sip, |
| 424 | .saddr = tip } } }; |
| 425 | struct rtable *rt; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 426 | int flag = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | /*unsigned long now; */ |
| 428 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 429 | if (ip_route_output_key(&rt, &fl) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | return 1; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 431 | if (rt->u.dst.dev != dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | NET_INC_STATS_BH(LINUX_MIB_ARPFILTER); |
| 433 | flag = 1; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 434 | } |
| 435 | ip_rt_put(rt); |
| 436 | return flag; |
| 437 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | /* OBSOLETE FUNCTIONS */ |
| 440 | |
| 441 | /* |
| 442 | * Find an arp mapping in the cache. If not found, post a request. |
| 443 | * |
| 444 | * It is very UGLY routine: it DOES NOT use skb->dst->neighbour, |
| 445 | * even if it exists. It is supposed that skb->dev was mangled |
| 446 | * by a virtual device (eql, shaper). Nobody but broken devices |
| 447 | * is allowed to use this function, it is scheduled to be removed. --ANK |
| 448 | */ |
| 449 | |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 450 | static int arp_set_predefined(int addr_hint, unsigned char * haddr, __be32 paddr, struct net_device * dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
| 452 | switch (addr_hint) { |
| 453 | case RTN_LOCAL: |
| 454 | printk(KERN_DEBUG "ARP: arp called for own IP address\n"); |
| 455 | memcpy(haddr, dev->dev_addr, dev->addr_len); |
| 456 | return 1; |
| 457 | case RTN_MULTICAST: |
| 458 | arp_mc_map(paddr, haddr, dev, 1); |
| 459 | return 1; |
| 460 | case RTN_BROADCAST: |
| 461 | memcpy(haddr, dev->broadcast, dev->addr_len); |
| 462 | return 1; |
| 463 | } |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | |
| 468 | int arp_find(unsigned char *haddr, struct sk_buff *skb) |
| 469 | { |
| 470 | struct net_device *dev = skb->dev; |
Al Viro | fd68322 | 2006-09-26 22:17:51 -0700 | [diff] [blame] | 471 | __be32 paddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct neighbour *n; |
| 473 | |
| 474 | if (!skb->dst) { |
| 475 | printk(KERN_DEBUG "arp_find is called with dst==NULL\n"); |
| 476 | kfree_skb(skb); |
| 477 | return 1; |
| 478 | } |
| 479 | |
| 480 | paddr = ((struct rtable*)skb->dst)->rt_gateway; |
| 481 | |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 482 | if (arp_set_predefined(inet_addr_type(&init_net, paddr), haddr, paddr, dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | return 0; |
| 484 | |
| 485 | n = __neigh_lookup(&arp_tbl, &paddr, dev, 1); |
| 486 | |
| 487 | if (n) { |
| 488 | n->used = jiffies; |
| 489 | if (n->nud_state&NUD_VALID || neigh_event_send(n, skb) == 0) { |
| 490 | read_lock_bh(&n->lock); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 491 | memcpy(haddr, n->ha, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | read_unlock_bh(&n->lock); |
| 493 | neigh_release(n); |
| 494 | return 0; |
| 495 | } |
| 496 | neigh_release(n); |
| 497 | } else |
| 498 | kfree_skb(skb); |
| 499 | return 1; |
| 500 | } |
| 501 | |
| 502 | /* END OF OBSOLETE FUNCTIONS */ |
| 503 | |
| 504 | int arp_bind_neighbour(struct dst_entry *dst) |
| 505 | { |
| 506 | struct net_device *dev = dst->dev; |
| 507 | struct neighbour *n = dst->neighbour; |
| 508 | |
| 509 | if (dev == NULL) |
| 510 | return -EINVAL; |
| 511 | if (n == NULL) { |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 512 | __be32 nexthop = ((struct rtable*)dst)->rt_gateway; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | if (dev->flags&(IFF_LOOPBACK|IFF_POINTOPOINT)) |
| 514 | nexthop = 0; |
| 515 | n = __neigh_lookup_errno( |
| 516 | #if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE) |
| 517 | dev->type == ARPHRD_ATM ? clip_tbl_hook : |
| 518 | #endif |
| 519 | &arp_tbl, &nexthop, dev); |
| 520 | if (IS_ERR(n)) |
| 521 | return PTR_ERR(n); |
| 522 | dst->neighbour = n; |
| 523 | } |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Check if we can use proxy ARP for this path |
| 529 | */ |
| 530 | |
| 531 | static inline int arp_fwd_proxy(struct in_device *in_dev, struct rtable *rt) |
| 532 | { |
| 533 | struct in_device *out_dev; |
| 534 | int imi, omi = -1; |
| 535 | |
| 536 | if (!IN_DEV_PROXY_ARP(in_dev)) |
| 537 | return 0; |
| 538 | |
| 539 | if ((imi = IN_DEV_MEDIUM_ID(in_dev)) == 0) |
| 540 | return 1; |
| 541 | if (imi == -1) |
| 542 | return 0; |
| 543 | |
| 544 | /* place to check for proxy_arp for routes */ |
| 545 | |
| 546 | if ((out_dev = in_dev_get(rt->u.dst.dev)) != NULL) { |
| 547 | omi = IN_DEV_MEDIUM_ID(out_dev); |
| 548 | in_dev_put(out_dev); |
| 549 | } |
| 550 | return (omi != imi && omi != -1); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Interface to link layer: send routine and receive handler. |
| 555 | */ |
| 556 | |
| 557 | /* |
| 558 | * Create an arp packet. If (dest_hw == NULL), we create a broadcast |
| 559 | * message. |
| 560 | */ |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 561 | struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, |
| 562 | struct net_device *dev, __be32 src_ip, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | unsigned char *dest_hw, unsigned char *src_hw, |
| 564 | unsigned char *target_hw) |
| 565 | { |
| 566 | struct sk_buff *skb; |
| 567 | struct arphdr *arp; |
| 568 | unsigned char *arp_ptr; |
| 569 | |
| 570 | /* |
| 571 | * Allocate a buffer |
| 572 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | skb = alloc_skb(sizeof(struct arphdr)+ 2*(dev->addr_len+4) |
| 575 | + LL_RESERVED_SPACE(dev), GFP_ATOMIC); |
| 576 | if (skb == NULL) |
| 577 | return NULL; |
| 578 | |
| 579 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 580 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | arp = (struct arphdr *) skb_put(skb,sizeof(struct arphdr) + 2*(dev->addr_len+4)); |
| 582 | skb->dev = dev; |
| 583 | skb->protocol = htons(ETH_P_ARP); |
| 584 | if (src_hw == NULL) |
| 585 | src_hw = dev->dev_addr; |
| 586 | if (dest_hw == NULL) |
| 587 | dest_hw = dev->broadcast; |
| 588 | |
| 589 | /* |
| 590 | * Fill the device header for the ARP frame |
| 591 | */ |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 592 | if (dev_hard_header(skb, dev, ptype, dest_hw, src_hw, skb->len) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | goto out; |
| 594 | |
| 595 | /* |
| 596 | * Fill out the arp protocol part. |
| 597 | * |
| 598 | * The arp hardware type should match the device type, except for FDDI, |
| 599 | * which (according to RFC 1390) should always equal 1 (Ethernet). |
| 600 | */ |
| 601 | /* |
| 602 | * Exceptions everywhere. AX.25 uses the AX.25 PID value not the |
| 603 | * DIX code for the protocol. Make these device structure fields. |
| 604 | */ |
| 605 | switch (dev->type) { |
| 606 | default: |
| 607 | arp->ar_hrd = htons(dev->type); |
| 608 | arp->ar_pro = htons(ETH_P_IP); |
| 609 | break; |
| 610 | |
| 611 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
| 612 | case ARPHRD_AX25: |
| 613 | arp->ar_hrd = htons(ARPHRD_AX25); |
| 614 | arp->ar_pro = htons(AX25_P_IP); |
| 615 | break; |
| 616 | |
| 617 | #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE) |
| 618 | case ARPHRD_NETROM: |
| 619 | arp->ar_hrd = htons(ARPHRD_NETROM); |
| 620 | arp->ar_pro = htons(AX25_P_IP); |
| 621 | break; |
| 622 | #endif |
| 623 | #endif |
| 624 | |
| 625 | #ifdef CONFIG_FDDI |
| 626 | case ARPHRD_FDDI: |
| 627 | arp->ar_hrd = htons(ARPHRD_ETHER); |
| 628 | arp->ar_pro = htons(ETH_P_IP); |
| 629 | break; |
| 630 | #endif |
| 631 | #ifdef CONFIG_TR |
| 632 | case ARPHRD_IEEE802_TR: |
| 633 | arp->ar_hrd = htons(ARPHRD_IEEE802); |
| 634 | arp->ar_pro = htons(ETH_P_IP); |
| 635 | break; |
| 636 | #endif |
| 637 | } |
| 638 | |
| 639 | arp->ar_hln = dev->addr_len; |
| 640 | arp->ar_pln = 4; |
| 641 | arp->ar_op = htons(type); |
| 642 | |
| 643 | arp_ptr=(unsigned char *)(arp+1); |
| 644 | |
| 645 | memcpy(arp_ptr, src_hw, dev->addr_len); |
| 646 | arp_ptr+=dev->addr_len; |
| 647 | memcpy(arp_ptr, &src_ip,4); |
| 648 | arp_ptr+=4; |
| 649 | if (target_hw != NULL) |
| 650 | memcpy(arp_ptr, target_hw, dev->addr_len); |
| 651 | else |
| 652 | memset(arp_ptr, 0, dev->addr_len); |
| 653 | arp_ptr+=dev->addr_len; |
| 654 | memcpy(arp_ptr, &dest_ip, 4); |
| 655 | |
| 656 | return skb; |
| 657 | |
| 658 | out: |
| 659 | kfree_skb(skb); |
| 660 | return NULL; |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * Send an arp packet. |
| 665 | */ |
| 666 | void arp_xmit(struct sk_buff *skb) |
| 667 | { |
| 668 | /* Send it off, maybe filter it using firewalling first. */ |
| 669 | NF_HOOK(NF_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit); |
| 670 | } |
| 671 | |
| 672 | /* |
| 673 | * Create and send an arp packet. |
| 674 | */ |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 675 | void arp_send(int type, int ptype, __be32 dest_ip, |
| 676 | struct net_device *dev, __be32 src_ip, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | unsigned char *dest_hw, unsigned char *src_hw, |
| 678 | unsigned char *target_hw) |
| 679 | { |
| 680 | struct sk_buff *skb; |
| 681 | |
| 682 | /* |
| 683 | * No arp on this interface. |
| 684 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | if (dev->flags&IFF_NOARP) |
| 687 | return; |
| 688 | |
| 689 | skb = arp_create(type, ptype, dest_ip, dev, src_ip, |
| 690 | dest_hw, src_hw, target_hw); |
| 691 | if (skb == NULL) { |
| 692 | return; |
| 693 | } |
| 694 | |
| 695 | arp_xmit(skb); |
| 696 | } |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | /* |
| 699 | * Process an arp request. |
| 700 | */ |
| 701 | |
| 702 | static int arp_process(struct sk_buff *skb) |
| 703 | { |
| 704 | struct net_device *dev = skb->dev; |
| 705 | struct in_device *in_dev = in_dev_get(dev); |
| 706 | struct arphdr *arp; |
| 707 | unsigned char *arp_ptr; |
| 708 | struct rtable *rt; |
Mark Ryden | e0260fe | 2007-12-19 23:38:11 -0800 | [diff] [blame] | 709 | unsigned char *sha; |
Al Viro | 9e12bb2 | 2006-09-26 21:25:20 -0700 | [diff] [blame] | 710 | __be32 sip, tip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | u16 dev_type = dev->type; |
| 712 | int addr_type; |
| 713 | struct neighbour *n; |
| 714 | |
| 715 | /* arp_rcv below verifies the ARP header and verifies the device |
| 716 | * is ARP'able. |
| 717 | */ |
| 718 | |
| 719 | if (in_dev == NULL) |
| 720 | goto out; |
| 721 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 722 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | switch (dev_type) { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 725 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (arp->ar_pro != htons(ETH_P_IP) || |
| 727 | htons(dev_type) != arp->ar_hrd) |
| 728 | goto out; |
| 729 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | case ARPHRD_ETHER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | case ARPHRD_IEEE802_TR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | case ARPHRD_FDDI: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | case ARPHRD_IEEE802: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | /* |
| 735 | * ETHERNET, Token Ring and Fibre Channel (which are IEEE 802 |
| 736 | * devices, according to RFC 2625) devices will accept ARP |
| 737 | * hardware types of either 1 (Ethernet) or 6 (IEEE 802.2). |
| 738 | * This is the case also of FDDI, where the RFC 1390 says that |
| 739 | * FDDI devices should accept ARP hardware of (1) Ethernet, |
| 740 | * however, to be more robust, we'll accept both 1 (Ethernet) |
| 741 | * or 6 (IEEE 802.2) |
| 742 | */ |
| 743 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
| 744 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
| 745 | arp->ar_pro != htons(ETH_P_IP)) |
| 746 | goto out; |
| 747 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | case ARPHRD_AX25: |
| 749 | if (arp->ar_pro != htons(AX25_P_IP) || |
| 750 | arp->ar_hrd != htons(ARPHRD_AX25)) |
| 751 | goto out; |
| 752 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | case ARPHRD_NETROM: |
| 754 | if (arp->ar_pro != htons(AX25_P_IP) || |
| 755 | arp->ar_hrd != htons(ARPHRD_NETROM)) |
| 756 | goto out; |
| 757 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
| 759 | |
| 760 | /* Understand only these message types */ |
| 761 | |
| 762 | if (arp->ar_op != htons(ARPOP_REPLY) && |
| 763 | arp->ar_op != htons(ARPOP_REQUEST)) |
| 764 | goto out; |
| 765 | |
| 766 | /* |
| 767 | * Extract fields |
| 768 | */ |
| 769 | arp_ptr= (unsigned char *)(arp+1); |
| 770 | sha = arp_ptr; |
| 771 | arp_ptr += dev->addr_len; |
| 772 | memcpy(&sip, arp_ptr, 4); |
| 773 | arp_ptr += 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | arp_ptr += dev->addr_len; |
| 775 | memcpy(&tip, arp_ptr, 4); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 776 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | * Check for bad requests for 127.x.x.x and requests for multicast |
| 778 | * addresses. If this is one such, delete it. |
| 779 | */ |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 780 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | goto out; |
| 782 | |
| 783 | /* |
| 784 | * Special case: We must set Frame Relay source Q.922 address |
| 785 | */ |
| 786 | if (dev_type == ARPHRD_DLCI) |
| 787 | sha = dev->broadcast; |
| 788 | |
| 789 | /* |
| 790 | * Process entry. The idea here is we want to send a reply if it is a |
| 791 | * request for us or if it is a request for someone else that we hold |
| 792 | * a proxy for. We want to add an entry to our cache if it is a reply |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 793 | * to us or if it is a request for our address. |
| 794 | * (The assumption for this last is that if someone is requesting our |
| 795 | * address, they are probably intending to talk to us, so it saves time |
| 796 | * if we cache their address. Their address is also probably not in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | * our cache, since ours is not in their cache.) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 798 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | * Putting this another way, we only care about replies if they are to |
| 800 | * us, in which case we add them to the cache. For requests, we care |
| 801 | * about those for us and those for our proxies. We reply to both, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 802 | * and in the case of requests for us we add the requester to the arp |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | * cache. |
| 804 | */ |
| 805 | |
| 806 | /* Special case: IPv4 duplicate address detection packet (RFC2131) */ |
| 807 | if (sip == 0) { |
| 808 | if (arp->ar_op == htons(ARPOP_REQUEST) && |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 809 | inet_addr_type(&init_net, tip) == RTN_LOCAL && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | !arp_ignore(in_dev,dev,sip,tip)) |
Jonas Danielsson | b4a9811 | 2007-11-20 17:38:16 -0800 | [diff] [blame] | 811 | arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, |
| 812 | dev->dev_addr, sha); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | goto out; |
| 814 | } |
| 815 | |
| 816 | if (arp->ar_op == htons(ARPOP_REQUEST) && |
| 817 | ip_route_input(skb, tip, sip, 0, dev) == 0) { |
| 818 | |
| 819 | rt = (struct rtable*)skb->dst; |
| 820 | addr_type = rt->rt_type; |
| 821 | |
| 822 | if (addr_type == RTN_LOCAL) { |
| 823 | n = neigh_event_ns(&arp_tbl, sha, &sip, dev); |
| 824 | if (n) { |
| 825 | int dont_send = 0; |
| 826 | |
| 827 | if (!dont_send) |
| 828 | dont_send |= arp_ignore(in_dev,dev,sip,tip); |
| 829 | if (!dont_send && IN_DEV_ARPFILTER(in_dev)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 830 | dont_send |= arp_filter(sip,tip,dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | if (!dont_send) |
| 832 | arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha); |
| 833 | |
| 834 | neigh_release(n); |
| 835 | } |
| 836 | goto out; |
| 837 | } else if (IN_DEV_FORWARD(in_dev)) { |
Rami Rosen | cb7928a | 2008-01-09 00:18:24 -0800 | [diff] [blame] | 838 | if (addr_type == RTN_UNICAST && rt->u.dst.dev != dev && |
| 839 | (arp_fwd_proxy(in_dev, rt) || pneigh_lookup(&arp_tbl, &init_net, &tip, dev, 0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | n = neigh_event_ns(&arp_tbl, sha, &sip, dev); |
| 841 | if (n) |
| 842 | neigh_release(n); |
| 843 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 844 | if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | skb->pkt_type == PACKET_HOST || |
| 846 | in_dev->arp_parms->proxy_delay == 0) { |
| 847 | arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha); |
| 848 | } else { |
| 849 | pneigh_enqueue(&arp_tbl, in_dev->arp_parms, skb); |
| 850 | in_dev_put(in_dev); |
| 851 | return 0; |
| 852 | } |
| 853 | goto out; |
| 854 | } |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | /* Update our ARP tables */ |
| 859 | |
| 860 | n = __neigh_lookup(&arp_tbl, &sip, dev, 0); |
| 861 | |
Pavel Emelyanov | 586f121 | 2007-12-16 13:32:48 -0800 | [diff] [blame] | 862 | if (IPV4_DEVCONF_ALL(dev->nd_net, ARP_ACCEPT)) { |
Neil Horman | abd596a | 2006-03-20 22:39:47 -0800 | [diff] [blame] | 863 | /* Unsolicited ARP is not accepted by default. |
| 864 | It is possible, that this option should be enabled for some |
| 865 | devices (strip is candidate) |
| 866 | */ |
| 867 | if (n == NULL && |
| 868 | arp->ar_op == htons(ARPOP_REPLY) && |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 869 | inet_addr_type(&init_net, sip) == RTN_UNICAST) |
Jean Delvare | 1b1ac75 | 2007-07-14 20:51:44 -0700 | [diff] [blame] | 870 | n = __neigh_lookup(&arp_tbl, &sip, dev, 1); |
Neil Horman | abd596a | 2006-03-20 22:39:47 -0800 | [diff] [blame] | 871 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | if (n) { |
| 874 | int state = NUD_REACHABLE; |
| 875 | int override; |
| 876 | |
| 877 | /* If several different ARP replies follows back-to-back, |
| 878 | use the FIRST one. It is possible, if several proxy |
| 879 | agents are active. Taking the first reply prevents |
| 880 | arp trashing and chooses the fastest router. |
| 881 | */ |
| 882 | override = time_after(jiffies, n->updated + n->parms->locktime); |
| 883 | |
| 884 | /* Broadcast replies and request packets |
| 885 | do not assert neighbour reachability. |
| 886 | */ |
| 887 | if (arp->ar_op != htons(ARPOP_REPLY) || |
| 888 | skb->pkt_type != PACKET_HOST) |
| 889 | state = NUD_STALE; |
| 890 | neigh_update(n, sha, state, override ? NEIGH_UPDATE_F_OVERRIDE : 0); |
| 891 | neigh_release(n); |
| 892 | } |
| 893 | |
| 894 | out: |
| 895 | if (in_dev) |
| 896 | in_dev_put(in_dev); |
| 897 | kfree_skb(skb); |
| 898 | return 0; |
| 899 | } |
| 900 | |
Herbert Xu | 444fc8f | 2005-10-03 14:18:10 -0700 | [diff] [blame] | 901 | static void parp_redo(struct sk_buff *skb) |
| 902 | { |
| 903 | arp_process(skb); |
| 904 | } |
| 905 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
| 907 | /* |
| 908 | * Receive an arp request from the device layer. |
| 909 | */ |
| 910 | |
Adrian Bunk | 6c97e72 | 2006-04-12 13:57:59 -0700 | [diff] [blame] | 911 | static int arp_rcv(struct sk_buff *skb, struct net_device *dev, |
| 912 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | { |
| 914 | struct arphdr *arp; |
| 915 | |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 916 | if (dev->nd_net != &init_net) |
| 917 | goto freeskb; |
| 918 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ |
| 920 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + |
| 921 | (2 * dev->addr_len) + |
| 922 | (2 * sizeof(u32))))) |
| 923 | goto freeskb; |
| 924 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 925 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | if (arp->ar_hln != dev->addr_len || |
| 927 | dev->flags & IFF_NOARP || |
| 928 | skb->pkt_type == PACKET_OTHERHOST || |
| 929 | skb->pkt_type == PACKET_LOOPBACK || |
| 930 | arp->ar_pln != 4) |
| 931 | goto freeskb; |
| 932 | |
| 933 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 934 | goto out_of_mem; |
| 935 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 936 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
| 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | return NF_HOOK(NF_ARP, NF_ARP_IN, skb, dev, NULL, arp_process); |
| 939 | |
| 940 | freeskb: |
| 941 | kfree_skb(skb); |
| 942 | out_of_mem: |
| 943 | return 0; |
| 944 | } |
| 945 | |
| 946 | /* |
| 947 | * User level interface (ioctl) |
| 948 | */ |
| 949 | |
| 950 | /* |
| 951 | * Set (create) an ARP cache entry. |
| 952 | */ |
| 953 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 954 | static int arp_req_set_proxy(struct net *net, struct net_device *dev, int on) |
Pavel Emelyanov | f8b33fd | 2007-12-05 21:20:50 -0800 | [diff] [blame] | 955 | { |
| 956 | if (dev == NULL) { |
Pavel Emelyanov | 586f121 | 2007-12-16 13:32:48 -0800 | [diff] [blame] | 957 | IPV4_DEVCONF_ALL(net, PROXY_ARP) = on; |
Pavel Emelyanov | f8b33fd | 2007-12-05 21:20:50 -0800 | [diff] [blame] | 958 | return 0; |
| 959 | } |
| 960 | if (__in_dev_get_rtnl(dev)) { |
| 961 | IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, on); |
| 962 | return 0; |
| 963 | } |
| 964 | return -ENXIO; |
| 965 | } |
| 966 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 967 | static int arp_req_set_public(struct net *net, struct arpreq *r, |
| 968 | struct net_device *dev) |
Pavel Emelyanov | 43dc170 | 2007-12-05 21:19:44 -0800 | [diff] [blame] | 969 | { |
| 970 | __be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; |
| 971 | __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; |
| 972 | |
| 973 | if (mask && mask != htonl(0xFFFFFFFF)) |
| 974 | return -EINVAL; |
| 975 | if (!dev && (r->arp_flags & ATF_COM)) { |
| 976 | dev = dev_getbyhwaddr(&init_net, r->arp_ha.sa_family, |
| 977 | r->arp_ha.sa_data); |
| 978 | if (!dev) |
| 979 | return -ENODEV; |
| 980 | } |
| 981 | if (mask) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 982 | if (pneigh_lookup(&arp_tbl, &init_net, &ip, dev, 1) == NULL) |
Pavel Emelyanov | 43dc170 | 2007-12-05 21:19:44 -0800 | [diff] [blame] | 983 | return -ENOBUFS; |
| 984 | return 0; |
| 985 | } |
Pavel Emelyanov | f8b33fd | 2007-12-05 21:20:50 -0800 | [diff] [blame] | 986 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 987 | return arp_req_set_proxy(net, dev, 1); |
Pavel Emelyanov | 43dc170 | 2007-12-05 21:19:44 -0800 | [diff] [blame] | 988 | } |
| 989 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 990 | static int arp_req_set(struct net *net, struct arpreq *r, |
| 991 | struct net_device * dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | { |
Pavel Emelyanov | 43dc170 | 2007-12-05 21:19:44 -0800 | [diff] [blame] | 993 | __be32 ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | struct neighbour *neigh; |
| 995 | int err; |
| 996 | |
Pavel Emelyanov | 43dc170 | 2007-12-05 21:19:44 -0800 | [diff] [blame] | 997 | if (r->arp_flags & ATF_PUBL) |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 998 | return arp_req_set_public(net, r, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
Pavel Emelyanov | 43dc170 | 2007-12-05 21:19:44 -0800 | [diff] [blame] | 1000 | ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | if (r->arp_flags & ATF_PERM) |
| 1002 | r->arp_flags |= ATF_COM; |
| 1003 | if (dev == NULL) { |
| 1004 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, |
| 1005 | .tos = RTO_ONLINK } } }; |
| 1006 | struct rtable * rt; |
| 1007 | if ((err = ip_route_output_key(&rt, &fl)) != 0) |
| 1008 | return err; |
| 1009 | dev = rt->u.dst.dev; |
| 1010 | ip_rt_put(rt); |
| 1011 | if (!dev) |
| 1012 | return -EINVAL; |
| 1013 | } |
| 1014 | switch (dev->type) { |
| 1015 | #ifdef CONFIG_FDDI |
| 1016 | case ARPHRD_FDDI: |
| 1017 | /* |
| 1018 | * According to RFC 1390, FDDI devices should accept ARP |
| 1019 | * hardware types of 1 (Ethernet). However, to be more |
| 1020 | * robust, we'll accept hardware types of either 1 (Ethernet) |
| 1021 | * or 6 (IEEE 802.2). |
| 1022 | */ |
| 1023 | if (r->arp_ha.sa_family != ARPHRD_FDDI && |
| 1024 | r->arp_ha.sa_family != ARPHRD_ETHER && |
| 1025 | r->arp_ha.sa_family != ARPHRD_IEEE802) |
| 1026 | return -EINVAL; |
| 1027 | break; |
| 1028 | #endif |
| 1029 | default: |
| 1030 | if (r->arp_ha.sa_family != dev->type) |
| 1031 | return -EINVAL; |
| 1032 | break; |
| 1033 | } |
| 1034 | |
| 1035 | neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev); |
| 1036 | err = PTR_ERR(neigh); |
| 1037 | if (!IS_ERR(neigh)) { |
| 1038 | unsigned state = NUD_STALE; |
| 1039 | if (r->arp_flags & ATF_PERM) |
| 1040 | state = NUD_PERMANENT; |
| 1041 | err = neigh_update(neigh, (r->arp_flags&ATF_COM) ? |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1042 | r->arp_ha.sa_data : NULL, state, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | NEIGH_UPDATE_F_OVERRIDE| |
| 1044 | NEIGH_UPDATE_F_ADMIN); |
| 1045 | neigh_release(neigh); |
| 1046 | } |
| 1047 | return err; |
| 1048 | } |
| 1049 | |
| 1050 | static unsigned arp_state_to_flags(struct neighbour *neigh) |
| 1051 | { |
| 1052 | unsigned flags = 0; |
| 1053 | if (neigh->nud_state&NUD_PERMANENT) |
| 1054 | flags = ATF_PERM|ATF_COM; |
| 1055 | else if (neigh->nud_state&NUD_VALID) |
| 1056 | flags = ATF_COM; |
| 1057 | return flags; |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * Get an ARP cache entry. |
| 1062 | */ |
| 1063 | |
| 1064 | static int arp_req_get(struct arpreq *r, struct net_device *dev) |
| 1065 | { |
Al Viro | ed9bad0 | 2006-09-27 18:36:36 -0700 | [diff] [blame] | 1066 | __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | struct neighbour *neigh; |
| 1068 | int err = -ENXIO; |
| 1069 | |
| 1070 | neigh = neigh_lookup(&arp_tbl, &ip, dev); |
| 1071 | if (neigh) { |
| 1072 | read_lock_bh(&neigh->lock); |
| 1073 | memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len); |
| 1074 | r->arp_flags = arp_state_to_flags(neigh); |
| 1075 | read_unlock_bh(&neigh->lock); |
| 1076 | r->arp_ha.sa_family = dev->type; |
| 1077 | strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev)); |
| 1078 | neigh_release(neigh); |
| 1079 | err = 0; |
| 1080 | } |
| 1081 | return err; |
| 1082 | } |
| 1083 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1084 | static int arp_req_delete_public(struct net *net, struct arpreq *r, |
| 1085 | struct net_device *dev) |
Pavel Emelyanov | 46479b4 | 2007-12-05 21:20:18 -0800 | [diff] [blame] | 1086 | { |
| 1087 | __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; |
| 1088 | __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; |
| 1089 | |
| 1090 | if (mask == htonl(0xFFFFFFFF)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1091 | return pneigh_delete(&arp_tbl, &init_net, &ip, dev); |
Pavel Emelyanov | 46479b4 | 2007-12-05 21:20:18 -0800 | [diff] [blame] | 1092 | |
Pavel Emelyanov | f8b33fd | 2007-12-05 21:20:50 -0800 | [diff] [blame] | 1093 | if (mask) |
| 1094 | return -EINVAL; |
| 1095 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1096 | return arp_req_set_proxy(net, dev, 0); |
Pavel Emelyanov | 46479b4 | 2007-12-05 21:20:18 -0800 | [diff] [blame] | 1097 | } |
| 1098 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1099 | static int arp_req_delete(struct net *net, struct arpreq *r, |
| 1100 | struct net_device * dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | { |
| 1102 | int err; |
Pavel Emelyanov | 46479b4 | 2007-12-05 21:20:18 -0800 | [diff] [blame] | 1103 | __be32 ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | struct neighbour *neigh; |
| 1105 | |
Pavel Emelyanov | 46479b4 | 2007-12-05 21:20:18 -0800 | [diff] [blame] | 1106 | if (r->arp_flags & ATF_PUBL) |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1107 | return arp_req_delete_public(net, r, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
Pavel Emelyanov | 46479b4 | 2007-12-05 21:20:18 -0800 | [diff] [blame] | 1109 | ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | if (dev == NULL) { |
| 1111 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, |
| 1112 | .tos = RTO_ONLINK } } }; |
| 1113 | struct rtable * rt; |
| 1114 | if ((err = ip_route_output_key(&rt, &fl)) != 0) |
| 1115 | return err; |
| 1116 | dev = rt->u.dst.dev; |
| 1117 | ip_rt_put(rt); |
| 1118 | if (!dev) |
| 1119 | return -EINVAL; |
| 1120 | } |
| 1121 | err = -ENXIO; |
| 1122 | neigh = neigh_lookup(&arp_tbl, &ip, dev); |
| 1123 | if (neigh) { |
| 1124 | if (neigh->nud_state&~NUD_NOARP) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1125 | err = neigh_update(neigh, NULL, NUD_FAILED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | NEIGH_UPDATE_F_OVERRIDE| |
| 1127 | NEIGH_UPDATE_F_ADMIN); |
| 1128 | neigh_release(neigh); |
| 1129 | } |
| 1130 | return err; |
| 1131 | } |
| 1132 | |
| 1133 | /* |
| 1134 | * Handle an ARP layer I/O control request. |
| 1135 | */ |
| 1136 | |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1137 | int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | { |
| 1139 | int err; |
| 1140 | struct arpreq r; |
| 1141 | struct net_device *dev = NULL; |
| 1142 | |
| 1143 | switch (cmd) { |
| 1144 | case SIOCDARP: |
| 1145 | case SIOCSARP: |
| 1146 | if (!capable(CAP_NET_ADMIN)) |
| 1147 | return -EPERM; |
| 1148 | case SIOCGARP: |
| 1149 | err = copy_from_user(&r, arg, sizeof(struct arpreq)); |
| 1150 | if (err) |
| 1151 | return -EFAULT; |
| 1152 | break; |
| 1153 | default: |
| 1154 | return -EINVAL; |
| 1155 | } |
| 1156 | |
| 1157 | if (r.arp_pa.sa_family != AF_INET) |
| 1158 | return -EPFNOSUPPORT; |
| 1159 | |
| 1160 | if (!(r.arp_flags & ATF_PUBL) && |
| 1161 | (r.arp_flags & (ATF_NETMASK|ATF_DONTPUB))) |
| 1162 | return -EINVAL; |
| 1163 | if (!(r.arp_flags & ATF_NETMASK)) |
| 1164 | ((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr = |
| 1165 | htonl(0xFFFFFFFFUL); |
| 1166 | rtnl_lock(); |
| 1167 | if (r.arp_dev[0]) { |
| 1168 | err = -ENODEV; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1169 | if ((dev = __dev_get_by_name(&init_net, r.arp_dev)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | goto out; |
| 1171 | |
| 1172 | /* Mmmm... It is wrong... ARPHRD_NETROM==0 */ |
| 1173 | if (!r.arp_ha.sa_family) |
| 1174 | r.arp_ha.sa_family = dev->type; |
| 1175 | err = -EINVAL; |
| 1176 | if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type) |
| 1177 | goto out; |
| 1178 | } else if (cmd == SIOCGARP) { |
| 1179 | err = -ENODEV; |
| 1180 | goto out; |
| 1181 | } |
| 1182 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 1183 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | case SIOCDARP: |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1185 | err = arp_req_delete(net, &r, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | break; |
| 1187 | case SIOCSARP: |
Pavel Emelyanov | 32e569b | 2007-12-16 13:30:39 -0800 | [diff] [blame] | 1188 | err = arp_req_set(net, &r, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | break; |
| 1190 | case SIOCGARP: |
| 1191 | err = arp_req_get(&r, dev); |
| 1192 | if (!err && copy_to_user(arg, &r, sizeof(r))) |
| 1193 | err = -EFAULT; |
| 1194 | break; |
| 1195 | } |
| 1196 | out: |
| 1197 | rtnl_unlock(); |
| 1198 | return err; |
| 1199 | } |
| 1200 | |
| 1201 | static int arp_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1202 | { |
| 1203 | struct net_device *dev = ptr; |
| 1204 | |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 1205 | if (dev->nd_net != &init_net) |
| 1206 | return NOTIFY_DONE; |
| 1207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | switch (event) { |
| 1209 | case NETDEV_CHANGEADDR: |
| 1210 | neigh_changeaddr(&arp_tbl, dev); |
| 1211 | rt_cache_flush(0); |
| 1212 | break; |
| 1213 | default: |
| 1214 | break; |
| 1215 | } |
| 1216 | |
| 1217 | return NOTIFY_DONE; |
| 1218 | } |
| 1219 | |
| 1220 | static struct notifier_block arp_netdev_notifier = { |
| 1221 | .notifier_call = arp_netdev_event, |
| 1222 | }; |
| 1223 | |
| 1224 | /* Note, that it is not on notifier chain. |
| 1225 | It is necessary, that this routine was called after route cache will be |
| 1226 | flushed. |
| 1227 | */ |
| 1228 | void arp_ifdown(struct net_device *dev) |
| 1229 | { |
| 1230 | neigh_ifdown(&arp_tbl, dev); |
| 1231 | } |
| 1232 | |
| 1233 | |
| 1234 | /* |
| 1235 | * Called once on startup. |
| 1236 | */ |
| 1237 | |
| 1238 | static struct packet_type arp_packet_type = { |
| 1239 | .type = __constant_htons(ETH_P_ARP), |
| 1240 | .func = arp_rcv, |
| 1241 | }; |
| 1242 | |
| 1243 | static int arp_proc_init(void); |
| 1244 | |
| 1245 | void __init arp_init(void) |
| 1246 | { |
| 1247 | neigh_table_init(&arp_tbl); |
| 1248 | |
| 1249 | dev_add_pack(&arp_packet_type); |
| 1250 | arp_proc_init(); |
| 1251 | #ifdef CONFIG_SYSCTL |
| 1252 | neigh_sysctl_register(NULL, &arp_tbl.parms, NET_IPV4, |
| 1253 | NET_IPV4_NEIGH, "ipv4", NULL, NULL); |
| 1254 | #endif |
| 1255 | register_netdevice_notifier(&arp_netdev_notifier); |
| 1256 | } |
| 1257 | |
| 1258 | #ifdef CONFIG_PROC_FS |
| 1259 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
| 1260 | |
| 1261 | /* ------------------------------------------------------------------------ */ |
| 1262 | /* |
| 1263 | * ax25 -> ASCII conversion |
| 1264 | */ |
| 1265 | static char *ax2asc2(ax25_address *a, char *buf) |
| 1266 | { |
| 1267 | char c, *s; |
| 1268 | int n; |
| 1269 | |
| 1270 | for (n = 0, s = buf; n < 6; n++) { |
| 1271 | c = (a->ax25_call[n] >> 1) & 0x7F; |
| 1272 | |
| 1273 | if (c != ' ') *s++ = c; |
| 1274 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | *s++ = '-'; |
| 1277 | |
| 1278 | if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) { |
| 1279 | *s++ = '1'; |
| 1280 | n -= 10; |
| 1281 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | *s++ = n + '0'; |
| 1284 | *s++ = '\0'; |
| 1285 | |
| 1286 | if (*buf == '\0' || *buf == '-') |
| 1287 | return "*"; |
| 1288 | |
| 1289 | return buf; |
| 1290 | |
| 1291 | } |
| 1292 | #endif /* CONFIG_AX25 */ |
| 1293 | |
| 1294 | #define HBUFFERLEN 30 |
| 1295 | |
| 1296 | static void arp_format_neigh_entry(struct seq_file *seq, |
| 1297 | struct neighbour *n) |
| 1298 | { |
| 1299 | char hbuffer[HBUFFERLEN]; |
| 1300 | const char hexbuf[] = "0123456789ABCDEF"; |
| 1301 | int k, j; |
| 1302 | char tbuf[16]; |
| 1303 | struct net_device *dev = n->dev; |
| 1304 | int hatype = dev->type; |
| 1305 | |
| 1306 | read_lock(&n->lock); |
| 1307 | /* Convert hardware address to XX:XX:XX:XX ... form. */ |
| 1308 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
| 1309 | if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM) |
| 1310 | ax2asc2((ax25_address *)n->ha, hbuffer); |
| 1311 | else { |
| 1312 | #endif |
| 1313 | for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) { |
| 1314 | hbuffer[k++] = hexbuf[(n->ha[j] >> 4) & 15]; |
| 1315 | hbuffer[k++] = hexbuf[n->ha[j] & 15]; |
| 1316 | hbuffer[k++] = ':'; |
| 1317 | } |
| 1318 | hbuffer[--k] = 0; |
| 1319 | #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) |
| 1320 | } |
| 1321 | #endif |
| 1322 | sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->primary_key)); |
| 1323 | seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n", |
| 1324 | tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name); |
| 1325 | read_unlock(&n->lock); |
| 1326 | } |
| 1327 | |
| 1328 | static void arp_format_pneigh_entry(struct seq_file *seq, |
| 1329 | struct pneigh_entry *n) |
| 1330 | { |
| 1331 | struct net_device *dev = n->dev; |
| 1332 | int hatype = dev ? dev->type : 0; |
| 1333 | char tbuf[16]; |
| 1334 | |
| 1335 | sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->key)); |
| 1336 | seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n", |
| 1337 | tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00", |
| 1338 | dev ? dev->name : "*"); |
| 1339 | } |
| 1340 | |
| 1341 | static int arp_seq_show(struct seq_file *seq, void *v) |
| 1342 | { |
| 1343 | if (v == SEQ_START_TOKEN) { |
| 1344 | seq_puts(seq, "IP address HW type Flags " |
| 1345 | "HW address Mask Device\n"); |
| 1346 | } else { |
| 1347 | struct neigh_seq_state *state = seq->private; |
| 1348 | |
| 1349 | if (state->flags & NEIGH_SEQ_IS_PNEIGH) |
| 1350 | arp_format_pneigh_entry(seq, v); |
| 1351 | else |
| 1352 | arp_format_neigh_entry(seq, v); |
| 1353 | } |
| 1354 | |
| 1355 | return 0; |
| 1356 | } |
| 1357 | |
| 1358 | static void *arp_seq_start(struct seq_file *seq, loff_t *pos) |
| 1359 | { |
| 1360 | /* Don't want to confuse "arp -a" w/ magic entries, |
| 1361 | * so we tell the generic iterator to skip NUD_NOARP. |
| 1362 | */ |
| 1363 | return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_SKIP_NOARP); |
| 1364 | } |
| 1365 | |
| 1366 | /* ------------------------------------------------------------------------ */ |
| 1367 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 1368 | static const struct seq_operations arp_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | .start = arp_seq_start, |
| 1370 | .next = neigh_seq_next, |
| 1371 | .stop = neigh_seq_stop, |
| 1372 | .show = arp_seq_show, |
| 1373 | }; |
| 1374 | |
| 1375 | static int arp_seq_open(struct inode *inode, struct file *file) |
| 1376 | { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1377 | return seq_open_net(inode, file, &arp_seq_ops, |
| 1378 | sizeof(struct neigh_seq_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | } |
| 1380 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 1381 | static const struct file_operations arp_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | .owner = THIS_MODULE, |
| 1383 | .open = arp_seq_open, |
| 1384 | .read = seq_read, |
| 1385 | .llseek = seq_lseek, |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1386 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | }; |
| 1388 | |
| 1389 | static int __init arp_proc_init(void) |
| 1390 | { |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1391 | if (!proc_net_fops_create(&init_net, "arp", S_IRUGO, &arp_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | return -ENOMEM; |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | #else /* CONFIG_PROC_FS */ |
| 1397 | |
| 1398 | static int __init arp_proc_init(void) |
| 1399 | { |
| 1400 | return 0; |
| 1401 | } |
| 1402 | |
| 1403 | #endif /* CONFIG_PROC_FS */ |
| 1404 | |
| 1405 | EXPORT_SYMBOL(arp_broken_ops); |
| 1406 | EXPORT_SYMBOL(arp_find); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | EXPORT_SYMBOL(arp_create); |
| 1408 | EXPORT_SYMBOL(arp_xmit); |
| 1409 | EXPORT_SYMBOL(arp_send); |
| 1410 | EXPORT_SYMBOL(arp_tbl); |
| 1411 | |
| 1412 | #if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE) |
| 1413 | EXPORT_SYMBOL(clip_tbl_hook); |
| 1414 | #endif |