2005-04-16 22:20:36 +00:00
|
|
|
/* linux/net/inet/arp.c
|
|
|
|
*
|
|
|
|
* Version: $Id: arp.c,v 1.99 2001/08/30 22:55:42 davem Exp $
|
|
|
|
*
|
|
|
|
* Copyright (C) 1994 by Florian La Roche
|
|
|
|
*
|
|
|
|
* This module implements the Address Resolution Protocol ARP (RFC 826),
|
|
|
|
* which is used to convert IP addresses (or in the future maybe other
|
|
|
|
* high-level addresses) into a low-level hardware address (like an Ethernet
|
|
|
|
* address).
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public License
|
|
|
|
* as published by the Free Software Foundation; either version
|
|
|
|
* 2 of the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* Fixes:
|
|
|
|
* Alan Cox : Removed the Ethernet assumptions in
|
|
|
|
* Florian's code
|
|
|
|
* Alan Cox : Fixed some small errors in the ARP
|
|
|
|
* logic
|
|
|
|
* Alan Cox : Allow >4K in /proc
|
|
|
|
* Alan Cox : Make ARP add its own protocol entry
|
|
|
|
* Ross Martin : Rewrote arp_rcv() and arp_get_info()
|
|
|
|
* Stephen Henson : Add AX25 support to arp_get_info()
|
|
|
|
* Alan Cox : Drop data when a device is downed.
|
|
|
|
* Alan Cox : Use init_timer().
|
|
|
|
* Alan Cox : Double lock fixes.
|
|
|
|
* Martin Seine : Move the arphdr structure
|
|
|
|
* to if_arp.h for compatibility.
|
|
|
|
* with BSD based programs.
|
|
|
|
* Andrew Tridgell : Added ARP netmask code and
|
|
|
|
* re-arranged proxy handling.
|
|
|
|
* Alan Cox : Changed to use notifiers.
|
|
|
|
* Niibe Yutaka : Reply for this device or proxies only.
|
|
|
|
* Alan Cox : Don't proxy across hardware types!
|
|
|
|
* Jonathan Naylor : Added support for NET/ROM.
|
|
|
|
* Mike Shaver : RFC1122 checks.
|
|
|
|
* Jonathan Naylor : Only lookup the hardware address for
|
|
|
|
* the correct hardware type.
|
|
|
|
* Germano Caronni : Assorted subtle races.
|
|
|
|
* Craig Schlenter : Don't modify permanent entry
|
|
|
|
* during arp_rcv.
|
|
|
|
* Russ Nelson : Tidied up a few bits.
|
|
|
|
* Alexey Kuznetsov: Major changes to caching and behaviour,
|
|
|
|
* eg intelligent arp probing and
|
|
|
|
* generation
|
|
|
|
* of host down events.
|
|
|
|
* Alan Cox : Missing unlock in device events.
|
|
|
|
* Eckes : ARP ioctl control errors.
|
|
|
|
* Alexey Kuznetsov: Arp free fix.
|
|
|
|
* Manuel Rodriguez: Gratuitous ARP.
|
|
|
|
* Jonathan Layes : Added arpd support through kerneld
|
|
|
|
* message queue (960314)
|
|
|
|
* Mike Shaver : /proc/sys/net/ipv4/arp_* support
|
|
|
|
* Mike McLagan : Routing by source
|
|
|
|
* Stuart Cheshire : Metricom and grat arp fixes
|
|
|
|
* *** FOR 2.1 clean this up ***
|
|
|
|
* Lawrence V. Stefani: (08/12/96) Added FDDI support.
|
|
|
|
* Alan Cox : Took the AP1000 nasty FDDI hack and
|
|
|
|
* folded into the mainstream FDDI code.
|
|
|
|
* Ack spit, Linus how did you allow that
|
|
|
|
* one in...
|
|
|
|
* Jes Sorensen : Make FDDI work again in 2.1.x and
|
|
|
|
* clean up the APFDDI & gen. FDDI bits.
|
|
|
|
* Alexey Kuznetsov: new arp state machine;
|
|
|
|
* now it is in net/core/neighbour.c.
|
|
|
|
* Krzysztof Halasa: Added Frame Relay ARP support.
|
|
|
|
* Arnaldo C. Melo : convert /proc/net/arp to seq_file
|
|
|
|
* Shmulik Hen: Split arp_send to arp_create and
|
|
|
|
* arp_xmit so intermediate drivers like
|
|
|
|
* bonding can change the skb before
|
|
|
|
* sending (e.g. insert 8021q tag).
|
|
|
|
* Harald Welte : convert to make use of jenkins hash
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/string.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/config.h>
|
|
|
|
#include <linux/socket.h>
|
|
|
|
#include <linux/sockios.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/in.h>
|
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/inet.h>
|
|
|
|
#include <linux/netdevice.h>
|
|
|
|
#include <linux/etherdevice.h>
|
|
|
|
#include <linux/fddidevice.h>
|
|
|
|
#include <linux/if_arp.h>
|
|
|
|
#include <linux/trdevice.h>
|
|
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <linux/stat.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/net.h>
|
|
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <linux/jhash.h>
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
#include <linux/sysctl.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <net/ip.h>
|
|
|
|
#include <net/icmp.h>
|
|
|
|
#include <net/route.h>
|
|
|
|
#include <net/protocol.h>
|
|
|
|
#include <net/tcp.h>
|
|
|
|
#include <net/sock.h>
|
|
|
|
#include <net/arp.h>
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
#include <net/ax25.h>
|
|
|
|
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
|
|
|
|
#include <net/netrom.h>
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
|
|
|
|
#include <net/atmclip.h>
|
|
|
|
struct neigh_table *clip_tbl_hook;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <asm/system.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
|
|
|
|
#include <linux/netfilter_arp.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Interface to generic neighbour cache.
|
|
|
|
*/
|
|
|
|
static u32 arp_hash(const void *pkey, const struct net_device *dev);
|
|
|
|
static int arp_constructor(struct neighbour *neigh);
|
|
|
|
static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb);
|
|
|
|
static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb);
|
|
|
|
static void parp_redo(struct sk_buff *skb);
|
|
|
|
|
|
|
|
static struct neigh_ops arp_generic_ops = {
|
|
|
|
.family = AF_INET,
|
|
|
|
.solicit = arp_solicit,
|
|
|
|
.error_report = arp_error_report,
|
|
|
|
.output = neigh_resolve_output,
|
|
|
|
.connected_output = neigh_connected_output,
|
|
|
|
.hh_output = dev_queue_xmit,
|
|
|
|
.queue_xmit = dev_queue_xmit,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct neigh_ops arp_hh_ops = {
|
|
|
|
.family = AF_INET,
|
|
|
|
.solicit = arp_solicit,
|
|
|
|
.error_report = arp_error_report,
|
|
|
|
.output = neigh_resolve_output,
|
|
|
|
.connected_output = neigh_resolve_output,
|
|
|
|
.hh_output = dev_queue_xmit,
|
|
|
|
.queue_xmit = dev_queue_xmit,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct neigh_ops arp_direct_ops = {
|
|
|
|
.family = AF_INET,
|
|
|
|
.output = dev_queue_xmit,
|
|
|
|
.connected_output = dev_queue_xmit,
|
|
|
|
.hh_output = dev_queue_xmit,
|
|
|
|
.queue_xmit = dev_queue_xmit,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct neigh_ops arp_broken_ops = {
|
|
|
|
.family = AF_INET,
|
|
|
|
.solicit = arp_solicit,
|
|
|
|
.error_report = arp_error_report,
|
|
|
|
.output = neigh_compat_output,
|
|
|
|
.connected_output = neigh_compat_output,
|
|
|
|
.hh_output = dev_queue_xmit,
|
|
|
|
.queue_xmit = dev_queue_xmit,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct neigh_table arp_tbl = {
|
|
|
|
.family = AF_INET,
|
|
|
|
.entry_size = sizeof(struct neighbour) + 4,
|
|
|
|
.key_len = 4,
|
|
|
|
.hash = arp_hash,
|
|
|
|
.constructor = arp_constructor,
|
|
|
|
.proxy_redo = parp_redo,
|
|
|
|
.id = "arp_cache",
|
|
|
|
.parms = {
|
|
|
|
.tbl = &arp_tbl,
|
|
|
|
.base_reachable_time = 30 * HZ,
|
|
|
|
.retrans_time = 1 * HZ,
|
|
|
|
.gc_staletime = 60 * HZ,
|
|
|
|
.reachable_time = 30 * HZ,
|
|
|
|
.delay_probe_time = 5 * HZ,
|
|
|
|
.queue_len = 3,
|
|
|
|
.ucast_probes = 3,
|
|
|
|
.mcast_probes = 3,
|
|
|
|
.anycast_delay = 1 * HZ,
|
|
|
|
.proxy_delay = (8 * HZ) / 10,
|
|
|
|
.proxy_qlen = 64,
|
|
|
|
.locktime = 1 * HZ,
|
|
|
|
},
|
|
|
|
.gc_interval = 30 * HZ,
|
|
|
|
.gc_thresh1 = 128,
|
|
|
|
.gc_thresh2 = 512,
|
|
|
|
.gc_thresh3 = 1024,
|
|
|
|
};
|
|
|
|
|
|
|
|
int arp_mc_map(u32 addr, u8 *haddr, struct net_device *dev, int dir)
|
|
|
|
{
|
|
|
|
switch (dev->type) {
|
|
|
|
case ARPHRD_ETHER:
|
|
|
|
case ARPHRD_FDDI:
|
|
|
|
case ARPHRD_IEEE802:
|
|
|
|
ip_eth_mc_map(addr, haddr);
|
|
|
|
return 0;
|
|
|
|
case ARPHRD_IEEE802_TR:
|
|
|
|
ip_tr_mc_map(addr, haddr);
|
|
|
|
return 0;
|
|
|
|
case ARPHRD_INFINIBAND:
|
|
|
|
ip_ib_mc_map(addr, haddr);
|
|
|
|
return 0;
|
|
|
|
default:
|
|
|
|
if (dir) {
|
|
|
|
memcpy(haddr, dev->broadcast, dev->addr_len);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static u32 arp_hash(const void *pkey, const struct net_device *dev)
|
|
|
|
{
|
|
|
|
return jhash_2words(*(u32 *)pkey, dev->ifindex, arp_tbl.hash_rnd);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int arp_constructor(struct neighbour *neigh)
|
|
|
|
{
|
|
|
|
u32 addr = *(u32*)neigh->primary_key;
|
|
|
|
struct net_device *dev = neigh->dev;
|
|
|
|
struct in_device *in_dev;
|
|
|
|
struct neigh_parms *parms;
|
|
|
|
|
|
|
|
neigh->type = inet_addr_type(addr);
|
|
|
|
|
|
|
|
rcu_read_lock();
|
2005-10-03 21:35:55 +00:00
|
|
|
in_dev = __in_dev_get_rcu(dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (in_dev == NULL) {
|
|
|
|
rcu_read_unlock();
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
parms = in_dev->arp_parms;
|
|
|
|
__neigh_parms_put(neigh->parms);
|
|
|
|
neigh->parms = neigh_parms_clone(parms);
|
|
|
|
rcu_read_unlock();
|
|
|
|
|
|
|
|
if (dev->hard_header == NULL) {
|
|
|
|
neigh->nud_state = NUD_NOARP;
|
|
|
|
neigh->ops = &arp_direct_ops;
|
|
|
|
neigh->output = neigh->ops->queue_xmit;
|
|
|
|
} else {
|
|
|
|
/* Good devices (checked by reading texts, but only Ethernet is
|
|
|
|
tested)
|
|
|
|
|
|
|
|
ARPHRD_ETHER: (ethernet, apfddi)
|
|
|
|
ARPHRD_FDDI: (fddi)
|
|
|
|
ARPHRD_IEEE802: (tr)
|
|
|
|
ARPHRD_METRICOM: (strip)
|
|
|
|
ARPHRD_ARCNET:
|
|
|
|
etc. etc. etc.
|
|
|
|
|
|
|
|
ARPHRD_IPDDP will also work, if author repairs it.
|
|
|
|
I did not it, because this driver does not work even
|
|
|
|
in old paradigm.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#if 1
|
|
|
|
/* So... these "amateur" devices are hopeless.
|
|
|
|
The only thing, that I can say now:
|
|
|
|
It is very sad that we need to keep ugly obsolete
|
|
|
|
code to make them happy.
|
|
|
|
|
|
|
|
They should be moved to more reasonable state, now
|
|
|
|
they use rebuild_header INSTEAD OF hard_start_xmit!!!
|
|
|
|
Besides that, they are sort of out of date
|
|
|
|
(a lot of redundant clones/copies, useless in 2.1),
|
|
|
|
I wonder why people believe that they work.
|
|
|
|
*/
|
|
|
|
switch (dev->type) {
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
case ARPHRD_ROSE:
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
case ARPHRD_AX25:
|
|
|
|
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
|
|
|
|
case ARPHRD_NETROM:
|
|
|
|
#endif
|
|
|
|
neigh->ops = &arp_broken_ops;
|
|
|
|
neigh->output = neigh->ops->output;
|
|
|
|
return 0;
|
|
|
|
#endif
|
|
|
|
;}
|
|
|
|
#endif
|
|
|
|
if (neigh->type == RTN_MULTICAST) {
|
|
|
|
neigh->nud_state = NUD_NOARP;
|
|
|
|
arp_mc_map(addr, neigh->ha, dev, 1);
|
|
|
|
} else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
|
|
|
|
neigh->nud_state = NUD_NOARP;
|
|
|
|
memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
|
|
|
|
} else if (neigh->type == RTN_BROADCAST || dev->flags&IFF_POINTOPOINT) {
|
|
|
|
neigh->nud_state = NUD_NOARP;
|
|
|
|
memcpy(neigh->ha, dev->broadcast, dev->addr_len);
|
|
|
|
}
|
|
|
|
if (dev->hard_header_cache)
|
|
|
|
neigh->ops = &arp_hh_ops;
|
|
|
|
else
|
|
|
|
neigh->ops = &arp_generic_ops;
|
|
|
|
if (neigh->nud_state&NUD_VALID)
|
|
|
|
neigh->output = neigh->ops->connected_output;
|
|
|
|
else
|
|
|
|
neigh->output = neigh->ops->output;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
dst_link_failure(skb);
|
|
|
|
kfree_skb(skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
u32 saddr = 0;
|
|
|
|
u8 *dst_ha = NULL;
|
|
|
|
struct net_device *dev = neigh->dev;
|
|
|
|
u32 target = *(u32*)neigh->primary_key;
|
|
|
|
int probes = atomic_read(&neigh->probes);
|
|
|
|
struct in_device *in_dev = in_dev_get(dev);
|
|
|
|
|
|
|
|
if (!in_dev)
|
|
|
|
return;
|
|
|
|
|
|
|
|
switch (IN_DEV_ARP_ANNOUNCE(in_dev)) {
|
|
|
|
default:
|
|
|
|
case 0: /* By default announce any local IP */
|
|
|
|
if (skb && inet_addr_type(skb->nh.iph->saddr) == RTN_LOCAL)
|
|
|
|
saddr = skb->nh.iph->saddr;
|
|
|
|
break;
|
|
|
|
case 1: /* Restrict announcements of saddr in same subnet */
|
|
|
|
if (!skb)
|
|
|
|
break;
|
|
|
|
saddr = skb->nh.iph->saddr;
|
|
|
|
if (inet_addr_type(saddr) == RTN_LOCAL) {
|
|
|
|
/* saddr should be known to target */
|
|
|
|
if (inet_addr_onlink(in_dev, target, saddr))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
saddr = 0;
|
|
|
|
break;
|
|
|
|
case 2: /* Avoid secondary IPs, get a primary/preferred one */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (in_dev)
|
|
|
|
in_dev_put(in_dev);
|
|
|
|
if (!saddr)
|
|
|
|
saddr = inet_select_addr(dev, target, RT_SCOPE_LINK);
|
|
|
|
|
|
|
|
if ((probes -= neigh->parms->ucast_probes) < 0) {
|
|
|
|
if (!(neigh->nud_state&NUD_VALID))
|
|
|
|
printk(KERN_DEBUG "trying to ucast probe in NUD_INVALID\n");
|
|
|
|
dst_ha = neigh->ha;
|
|
|
|
read_lock_bh(&neigh->lock);
|
|
|
|
} else if ((probes -= neigh->parms->app_probes) < 0) {
|
|
|
|
#ifdef CONFIG_ARPD
|
|
|
|
neigh_app_ns(neigh);
|
|
|
|
#endif
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,
|
|
|
|
dst_ha, dev->dev_addr, NULL);
|
|
|
|
if (dst_ha)
|
|
|
|
read_unlock_bh(&neigh->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int arp_ignore(struct in_device *in_dev, struct net_device *dev,
|
|
|
|
u32 sip, u32 tip)
|
|
|
|
{
|
|
|
|
int scope;
|
|
|
|
|
|
|
|
switch (IN_DEV_ARP_IGNORE(in_dev)) {
|
|
|
|
case 0: /* Reply, the tip is already validated */
|
|
|
|
return 0;
|
|
|
|
case 1: /* Reply only if tip is configured on the incoming interface */
|
|
|
|
sip = 0;
|
|
|
|
scope = RT_SCOPE_HOST;
|
|
|
|
break;
|
|
|
|
case 2: /*
|
|
|
|
* Reply only if tip is configured on the incoming interface
|
|
|
|
* and is in same subnet as sip
|
|
|
|
*/
|
|
|
|
scope = RT_SCOPE_HOST;
|
|
|
|
break;
|
|
|
|
case 3: /* Do not reply for scope host addresses */
|
|
|
|
sip = 0;
|
|
|
|
scope = RT_SCOPE_LINK;
|
|
|
|
dev = NULL;
|
|
|
|
break;
|
|
|
|
case 4: /* Reserved */
|
|
|
|
case 5:
|
|
|
|
case 6:
|
|
|
|
case 7:
|
|
|
|
return 0;
|
|
|
|
case 8: /* Do not reply */
|
|
|
|
return 1;
|
|
|
|
default:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return !inet_confirm_addr(dev, sip, tip, scope);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int arp_filter(__u32 sip, __u32 tip, struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = sip,
|
|
|
|
.saddr = tip } } };
|
|
|
|
struct rtable *rt;
|
|
|
|
int flag = 0;
|
|
|
|
/*unsigned long now; */
|
|
|
|
|
|
|
|
if (ip_route_output_key(&rt, &fl) < 0)
|
|
|
|
return 1;
|
|
|
|
if (rt->u.dst.dev != dev) {
|
|
|
|
NET_INC_STATS_BH(LINUX_MIB_ARPFILTER);
|
|
|
|
flag = 1;
|
|
|
|
}
|
|
|
|
ip_rt_put(rt);
|
|
|
|
return flag;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* OBSOLETE FUNCTIONS */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Find an arp mapping in the cache. If not found, post a request.
|
|
|
|
*
|
|
|
|
* It is very UGLY routine: it DOES NOT use skb->dst->neighbour,
|
|
|
|
* even if it exists. It is supposed that skb->dev was mangled
|
|
|
|
* by a virtual device (eql, shaper). Nobody but broken devices
|
|
|
|
* is allowed to use this function, it is scheduled to be removed. --ANK
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int arp_set_predefined(int addr_hint, unsigned char * haddr, u32 paddr, struct net_device * dev)
|
|
|
|
{
|
|
|
|
switch (addr_hint) {
|
|
|
|
case RTN_LOCAL:
|
|
|
|
printk(KERN_DEBUG "ARP: arp called for own IP address\n");
|
|
|
|
memcpy(haddr, dev->dev_addr, dev->addr_len);
|
|
|
|
return 1;
|
|
|
|
case RTN_MULTICAST:
|
|
|
|
arp_mc_map(paddr, haddr, dev, 1);
|
|
|
|
return 1;
|
|
|
|
case RTN_BROADCAST:
|
|
|
|
memcpy(haddr, dev->broadcast, dev->addr_len);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int arp_find(unsigned char *haddr, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct net_device *dev = skb->dev;
|
|
|
|
u32 paddr;
|
|
|
|
struct neighbour *n;
|
|
|
|
|
|
|
|
if (!skb->dst) {
|
|
|
|
printk(KERN_DEBUG "arp_find is called with dst==NULL\n");
|
|
|
|
kfree_skb(skb);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
paddr = ((struct rtable*)skb->dst)->rt_gateway;
|
|
|
|
|
|
|
|
if (arp_set_predefined(inet_addr_type(paddr), haddr, paddr, dev))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
n = __neigh_lookup(&arp_tbl, &paddr, dev, 1);
|
|
|
|
|
|
|
|
if (n) {
|
|
|
|
n->used = jiffies;
|
|
|
|
if (n->nud_state&NUD_VALID || neigh_event_send(n, skb) == 0) {
|
|
|
|
read_lock_bh(&n->lock);
|
|
|
|
memcpy(haddr, n->ha, dev->addr_len);
|
|
|
|
read_unlock_bh(&n->lock);
|
|
|
|
neigh_release(n);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
neigh_release(n);
|
|
|
|
} else
|
|
|
|
kfree_skb(skb);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* END OF OBSOLETE FUNCTIONS */
|
|
|
|
|
|
|
|
int arp_bind_neighbour(struct dst_entry *dst)
|
|
|
|
{
|
|
|
|
struct net_device *dev = dst->dev;
|
|
|
|
struct neighbour *n = dst->neighbour;
|
|
|
|
|
|
|
|
if (dev == NULL)
|
|
|
|
return -EINVAL;
|
|
|
|
if (n == NULL) {
|
|
|
|
u32 nexthop = ((struct rtable*)dst)->rt_gateway;
|
|
|
|
if (dev->flags&(IFF_LOOPBACK|IFF_POINTOPOINT))
|
|
|
|
nexthop = 0;
|
|
|
|
n = __neigh_lookup_errno(
|
|
|
|
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
|
|
|
|
dev->type == ARPHRD_ATM ? clip_tbl_hook :
|
|
|
|
#endif
|
|
|
|
&arp_tbl, &nexthop, dev);
|
|
|
|
if (IS_ERR(n))
|
|
|
|
return PTR_ERR(n);
|
|
|
|
dst->neighbour = n;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Check if we can use proxy ARP for this path
|
|
|
|
*/
|
|
|
|
|
|
|
|
static inline int arp_fwd_proxy(struct in_device *in_dev, struct rtable *rt)
|
|
|
|
{
|
|
|
|
struct in_device *out_dev;
|
|
|
|
int imi, omi = -1;
|
|
|
|
|
|
|
|
if (!IN_DEV_PROXY_ARP(in_dev))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if ((imi = IN_DEV_MEDIUM_ID(in_dev)) == 0)
|
|
|
|
return 1;
|
|
|
|
if (imi == -1)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* place to check for proxy_arp for routes */
|
|
|
|
|
|
|
|
if ((out_dev = in_dev_get(rt->u.dst.dev)) != NULL) {
|
|
|
|
omi = IN_DEV_MEDIUM_ID(out_dev);
|
|
|
|
in_dev_put(out_dev);
|
|
|
|
}
|
|
|
|
return (omi != imi && omi != -1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Interface to link layer: send routine and receive handler.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create an arp packet. If (dest_hw == NULL), we create a broadcast
|
|
|
|
* message.
|
|
|
|
*/
|
|
|
|
struct sk_buff *arp_create(int type, int ptype, u32 dest_ip,
|
|
|
|
struct net_device *dev, u32 src_ip,
|
|
|
|
unsigned char *dest_hw, unsigned char *src_hw,
|
|
|
|
unsigned char *target_hw)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct arphdr *arp;
|
|
|
|
unsigned char *arp_ptr;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Allocate a buffer
|
|
|
|
*/
|
|
|
|
|
|
|
|
skb = alloc_skb(sizeof(struct arphdr)+ 2*(dev->addr_len+4)
|
|
|
|
+ LL_RESERVED_SPACE(dev), GFP_ATOMIC);
|
|
|
|
if (skb == NULL)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
skb_reserve(skb, LL_RESERVED_SPACE(dev));
|
|
|
|
skb->nh.raw = skb->data;
|
|
|
|
arp = (struct arphdr *) skb_put(skb,sizeof(struct arphdr) + 2*(dev->addr_len+4));
|
|
|
|
skb->dev = dev;
|
|
|
|
skb->protocol = htons(ETH_P_ARP);
|
|
|
|
if (src_hw == NULL)
|
|
|
|
src_hw = dev->dev_addr;
|
|
|
|
if (dest_hw == NULL)
|
|
|
|
dest_hw = dev->broadcast;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Fill the device header for the ARP frame
|
|
|
|
*/
|
|
|
|
if (dev->hard_header &&
|
|
|
|
dev->hard_header(skb,dev,ptype,dest_hw,src_hw,skb->len) < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Fill out the arp protocol part.
|
|
|
|
*
|
|
|
|
* The arp hardware type should match the device type, except for FDDI,
|
|
|
|
* which (according to RFC 1390) should always equal 1 (Ethernet).
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
* Exceptions everywhere. AX.25 uses the AX.25 PID value not the
|
|
|
|
* DIX code for the protocol. Make these device structure fields.
|
|
|
|
*/
|
|
|
|
switch (dev->type) {
|
|
|
|
default:
|
|
|
|
arp->ar_hrd = htons(dev->type);
|
|
|
|
arp->ar_pro = htons(ETH_P_IP);
|
|
|
|
break;
|
|
|
|
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
case ARPHRD_AX25:
|
|
|
|
arp->ar_hrd = htons(ARPHRD_AX25);
|
|
|
|
arp->ar_pro = htons(AX25_P_IP);
|
|
|
|
break;
|
|
|
|
|
|
|
|
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
|
|
|
|
case ARPHRD_NETROM:
|
|
|
|
arp->ar_hrd = htons(ARPHRD_NETROM);
|
|
|
|
arp->ar_pro = htons(AX25_P_IP);
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_FDDI
|
|
|
|
case ARPHRD_FDDI:
|
|
|
|
arp->ar_hrd = htons(ARPHRD_ETHER);
|
|
|
|
arp->ar_pro = htons(ETH_P_IP);
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_TR
|
|
|
|
case ARPHRD_IEEE802_TR:
|
|
|
|
arp->ar_hrd = htons(ARPHRD_IEEE802);
|
|
|
|
arp->ar_pro = htons(ETH_P_IP);
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
arp->ar_hln = dev->addr_len;
|
|
|
|
arp->ar_pln = 4;
|
|
|
|
arp->ar_op = htons(type);
|
|
|
|
|
|
|
|
arp_ptr=(unsigned char *)(arp+1);
|
|
|
|
|
|
|
|
memcpy(arp_ptr, src_hw, dev->addr_len);
|
|
|
|
arp_ptr+=dev->addr_len;
|
|
|
|
memcpy(arp_ptr, &src_ip,4);
|
|
|
|
arp_ptr+=4;
|
|
|
|
if (target_hw != NULL)
|
|
|
|
memcpy(arp_ptr, target_hw, dev->addr_len);
|
|
|
|
else
|
|
|
|
memset(arp_ptr, 0, dev->addr_len);
|
|
|
|
arp_ptr+=dev->addr_len;
|
|
|
|
memcpy(arp_ptr, &dest_ip, 4);
|
|
|
|
|
|
|
|
return skb;
|
|
|
|
|
|
|
|
out:
|
|
|
|
kfree_skb(skb);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Send an arp packet.
|
|
|
|
*/
|
|
|
|
void arp_xmit(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
/* Send it off, maybe filter it using firewalling first. */
|
|
|
|
NF_HOOK(NF_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create and send an arp packet.
|
|
|
|
*/
|
|
|
|
void arp_send(int type, int ptype, u32 dest_ip,
|
|
|
|
struct net_device *dev, u32 src_ip,
|
|
|
|
unsigned char *dest_hw, unsigned char *src_hw,
|
|
|
|
unsigned char *target_hw)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* No arp on this interface.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (dev->flags&IFF_NOARP)
|
|
|
|
return;
|
|
|
|
|
|
|
|
skb = arp_create(type, ptype, dest_ip, dev, src_ip,
|
|
|
|
dest_hw, src_hw, target_hw);
|
|
|
|
if (skb == NULL) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
arp_xmit(skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process an arp request.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int arp_process(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct net_device *dev = skb->dev;
|
|
|
|
struct in_device *in_dev = in_dev_get(dev);
|
|
|
|
struct arphdr *arp;
|
|
|
|
unsigned char *arp_ptr;
|
|
|
|
struct rtable *rt;
|
|
|
|
unsigned char *sha, *tha;
|
|
|
|
u32 sip, tip;
|
|
|
|
u16 dev_type = dev->type;
|
|
|
|
int addr_type;
|
|
|
|
struct neighbour *n;
|
|
|
|
|
|
|
|
/* arp_rcv below verifies the ARP header and verifies the device
|
|
|
|
* is ARP'able.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (in_dev == NULL)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
arp = skb->nh.arph;
|
|
|
|
|
|
|
|
switch (dev_type) {
|
|
|
|
default:
|
|
|
|
if (arp->ar_pro != htons(ETH_P_IP) ||
|
|
|
|
htons(dev_type) != arp->ar_hrd)
|
|
|
|
goto out;
|
|
|
|
break;
|
|
|
|
#ifdef CONFIG_NET_ETHERNET
|
|
|
|
case ARPHRD_ETHER:
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_TR
|
|
|
|
case ARPHRD_IEEE802_TR:
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_FDDI
|
|
|
|
case ARPHRD_FDDI:
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_FC
|
|
|
|
case ARPHRD_IEEE802:
|
|
|
|
#endif
|
|
|
|
#if defined(CONFIG_NET_ETHERNET) || defined(CONFIG_TR) || \
|
|
|
|
defined(CONFIG_FDDI) || defined(CONFIG_NET_FC)
|
|
|
|
/*
|
|
|
|
* ETHERNET, Token Ring and Fibre Channel (which are IEEE 802
|
|
|
|
* devices, according to RFC 2625) devices will accept ARP
|
|
|
|
* hardware types of either 1 (Ethernet) or 6 (IEEE 802.2).
|
|
|
|
* This is the case also of FDDI, where the RFC 1390 says that
|
|
|
|
* FDDI devices should accept ARP hardware of (1) Ethernet,
|
|
|
|
* however, to be more robust, we'll accept both 1 (Ethernet)
|
|
|
|
* or 6 (IEEE 802.2)
|
|
|
|
*/
|
|
|
|
if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
|
|
|
|
arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
|
|
|
|
arp->ar_pro != htons(ETH_P_IP))
|
|
|
|
goto out;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
case ARPHRD_AX25:
|
|
|
|
if (arp->ar_pro != htons(AX25_P_IP) ||
|
|
|
|
arp->ar_hrd != htons(ARPHRD_AX25))
|
|
|
|
goto out;
|
|
|
|
break;
|
|
|
|
#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
|
|
|
|
case ARPHRD_NETROM:
|
|
|
|
if (arp->ar_pro != htons(AX25_P_IP) ||
|
|
|
|
arp->ar_hrd != htons(ARPHRD_NETROM))
|
|
|
|
goto out;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Understand only these message types */
|
|
|
|
|
|
|
|
if (arp->ar_op != htons(ARPOP_REPLY) &&
|
|
|
|
arp->ar_op != htons(ARPOP_REQUEST))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Extract fields
|
|
|
|
*/
|
|
|
|
arp_ptr= (unsigned char *)(arp+1);
|
|
|
|
sha = arp_ptr;
|
|
|
|
arp_ptr += dev->addr_len;
|
|
|
|
memcpy(&sip, arp_ptr, 4);
|
|
|
|
arp_ptr += 4;
|
|
|
|
tha = arp_ptr;
|
|
|
|
arp_ptr += dev->addr_len;
|
|
|
|
memcpy(&tip, arp_ptr, 4);
|
|
|
|
/*
|
|
|
|
* Check for bad requests for 127.x.x.x and requests for multicast
|
|
|
|
* addresses. If this is one such, delete it.
|
|
|
|
*/
|
|
|
|
if (LOOPBACK(tip) || MULTICAST(tip))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Special case: We must set Frame Relay source Q.922 address
|
|
|
|
*/
|
|
|
|
if (dev_type == ARPHRD_DLCI)
|
|
|
|
sha = dev->broadcast;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Process entry. The idea here is we want to send a reply if it is a
|
|
|
|
* request for us or if it is a request for someone else that we hold
|
|
|
|
* a proxy for. We want to add an entry to our cache if it is a reply
|
|
|
|
* to us or if it is a request for our address.
|
|
|
|
* (The assumption for this last is that if someone is requesting our
|
|
|
|
* address, they are probably intending to talk to us, so it saves time
|
|
|
|
* if we cache their address. Their address is also probably not in
|
|
|
|
* our cache, since ours is not in their cache.)
|
|
|
|
*
|
|
|
|
* Putting this another way, we only care about replies if they are to
|
|
|
|
* us, in which case we add them to the cache. For requests, we care
|
|
|
|
* about those for us and those for our proxies. We reply to both,
|
|
|
|
* and in the case of requests for us we add the requester to the arp
|
|
|
|
* cache.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Special case: IPv4 duplicate address detection packet (RFC2131) */
|
|
|
|
if (sip == 0) {
|
|
|
|
if (arp->ar_op == htons(ARPOP_REQUEST) &&
|
|
|
|
inet_addr_type(tip) == RTN_LOCAL &&
|
|
|
|
!arp_ignore(in_dev,dev,sip,tip))
|
|
|
|
arp_send(ARPOP_REPLY,ETH_P_ARP,tip,dev,tip,sha,dev->dev_addr,dev->dev_addr);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (arp->ar_op == htons(ARPOP_REQUEST) &&
|
|
|
|
ip_route_input(skb, tip, sip, 0, dev) == 0) {
|
|
|
|
|
|
|
|
rt = (struct rtable*)skb->dst;
|
|
|
|
addr_type = rt->rt_type;
|
|
|
|
|
|
|
|
if (addr_type == RTN_LOCAL) {
|
|
|
|
n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
|
|
|
|
if (n) {
|
|
|
|
int dont_send = 0;
|
|
|
|
|
|
|
|
if (!dont_send)
|
|
|
|
dont_send |= arp_ignore(in_dev,dev,sip,tip);
|
|
|
|
if (!dont_send && IN_DEV_ARPFILTER(in_dev))
|
|
|
|
dont_send |= arp_filter(sip,tip,dev);
|
|
|
|
if (!dont_send)
|
|
|
|
arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
|
|
|
|
|
|
|
|
neigh_release(n);
|
|
|
|
}
|
|
|
|
goto out;
|
|
|
|
} else if (IN_DEV_FORWARD(in_dev)) {
|
|
|
|
if ((rt->rt_flags&RTCF_DNAT) ||
|
|
|
|
(addr_type == RTN_UNICAST && rt->u.dst.dev != dev &&
|
|
|
|
(arp_fwd_proxy(in_dev, rt) || pneigh_lookup(&arp_tbl, &tip, dev, 0)))) {
|
|
|
|
n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
|
|
|
|
if (n)
|
|
|
|
neigh_release(n);
|
|
|
|
|
2005-08-15 00:24:31 +00:00
|
|
|
if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED ||
|
2005-04-16 22:20:36 +00:00
|
|
|
skb->pkt_type == PACKET_HOST ||
|
|
|
|
in_dev->arp_parms->proxy_delay == 0) {
|
|
|
|
arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
|
|
|
|
} else {
|
|
|
|
pneigh_enqueue(&arp_tbl, in_dev->arp_parms, skb);
|
|
|
|
in_dev_put(in_dev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Update our ARP tables */
|
|
|
|
|
|
|
|
n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
|
|
|
|
|
|
|
|
#ifdef CONFIG_IP_ACCEPT_UNSOLICITED_ARP
|
|
|
|
/* Unsolicited ARP is not accepted by default.
|
|
|
|
It is possible, that this option should be enabled for some
|
|
|
|
devices (strip is candidate)
|
|
|
|
*/
|
|
|
|
if (n == NULL &&
|
|
|
|
arp->ar_op == htons(ARPOP_REPLY) &&
|
|
|
|
inet_addr_type(sip) == RTN_UNICAST)
|
|
|
|
n = __neigh_lookup(&arp_tbl, &sip, dev, -1);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (n) {
|
|
|
|
int state = NUD_REACHABLE;
|
|
|
|
int override;
|
|
|
|
|
|
|
|
/* If several different ARP replies follows back-to-back,
|
|
|
|
use the FIRST one. It is possible, if several proxy
|
|
|
|
agents are active. Taking the first reply prevents
|
|
|
|
arp trashing and chooses the fastest router.
|
|
|
|
*/
|
|
|
|
override = time_after(jiffies, n->updated + n->parms->locktime);
|
|
|
|
|
|
|
|
/* Broadcast replies and request packets
|
|
|
|
do not assert neighbour reachability.
|
|
|
|
*/
|
|
|
|
if (arp->ar_op != htons(ARPOP_REPLY) ||
|
|
|
|
skb->pkt_type != PACKET_HOST)
|
|
|
|
state = NUD_STALE;
|
|
|
|
neigh_update(n, sha, state, override ? NEIGH_UPDATE_F_OVERRIDE : 0);
|
|
|
|
neigh_release(n);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (in_dev)
|
|
|
|
in_dev_put(in_dev);
|
|
|
|
kfree_skb(skb);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-10-03 21:18:10 +00:00
|
|
|
static void parp_redo(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
arp_process(skb);
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Receive an arp request from the device layer.
|
|
|
|
*/
|
|
|
|
|
2005-08-10 02:34:12 +00:00
|
|
|
int arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
struct arphdr *arp;
|
|
|
|
|
|
|
|
/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
|
|
|
|
if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
|
|
|
|
(2 * dev->addr_len) +
|
|
|
|
(2 * sizeof(u32)))))
|
|
|
|
goto freeskb;
|
|
|
|
|
|
|
|
arp = skb->nh.arph;
|
|
|
|
if (arp->ar_hln != dev->addr_len ||
|
|
|
|
dev->flags & IFF_NOARP ||
|
|
|
|
skb->pkt_type == PACKET_OTHERHOST ||
|
|
|
|
skb->pkt_type == PACKET_LOOPBACK ||
|
|
|
|
arp->ar_pln != 4)
|
|
|
|
goto freeskb;
|
|
|
|
|
|
|
|
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
|
|
|
|
goto out_of_mem;
|
|
|
|
|
2005-08-15 00:24:31 +00:00
|
|
|
memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return NF_HOOK(NF_ARP, NF_ARP_IN, skb, dev, NULL, arp_process);
|
|
|
|
|
|
|
|
freeskb:
|
|
|
|
kfree_skb(skb);
|
|
|
|
out_of_mem:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* User level interface (ioctl)
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set (create) an ARP cache entry.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int arp_req_set(struct arpreq *r, struct net_device * dev)
|
|
|
|
{
|
|
|
|
u32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
|
|
|
|
struct neighbour *neigh;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (r->arp_flags&ATF_PUBL) {
|
|
|
|
u32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr;
|
|
|
|
if (mask && mask != 0xFFFFFFFF)
|
|
|
|
return -EINVAL;
|
|
|
|
if (!dev && (r->arp_flags & ATF_COM)) {
|
|
|
|
dev = dev_getbyhwaddr(r->arp_ha.sa_family, r->arp_ha.sa_data);
|
|
|
|
if (!dev)
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
if (mask) {
|
|
|
|
if (pneigh_lookup(&arp_tbl, &ip, dev, 1) == NULL)
|
|
|
|
return -ENOBUFS;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (dev == NULL) {
|
|
|
|
ipv4_devconf.proxy_arp = 1;
|
|
|
|
return 0;
|
|
|
|
}
|
2005-10-03 21:35:55 +00:00
|
|
|
if (__in_dev_get_rtnl(dev)) {
|
|
|
|
__in_dev_get_rtnl(dev)->cnf.proxy_arp = 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (r->arp_flags & ATF_PERM)
|
|
|
|
r->arp_flags |= ATF_COM;
|
|
|
|
if (dev == NULL) {
|
|
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip,
|
|
|
|
.tos = RTO_ONLINK } } };
|
|
|
|
struct rtable * rt;
|
|
|
|
if ((err = ip_route_output_key(&rt, &fl)) != 0)
|
|
|
|
return err;
|
|
|
|
dev = rt->u.dst.dev;
|
|
|
|
ip_rt_put(rt);
|
|
|
|
if (!dev)
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
switch (dev->type) {
|
|
|
|
#ifdef CONFIG_FDDI
|
|
|
|
case ARPHRD_FDDI:
|
|
|
|
/*
|
|
|
|
* According to RFC 1390, FDDI devices should accept ARP
|
|
|
|
* hardware types of 1 (Ethernet). However, to be more
|
|
|
|
* robust, we'll accept hardware types of either 1 (Ethernet)
|
|
|
|
* or 6 (IEEE 802.2).
|
|
|
|
*/
|
|
|
|
if (r->arp_ha.sa_family != ARPHRD_FDDI &&
|
|
|
|
r->arp_ha.sa_family != ARPHRD_ETHER &&
|
|
|
|
r->arp_ha.sa_family != ARPHRD_IEEE802)
|
|
|
|
return -EINVAL;
|
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
default:
|
|
|
|
if (r->arp_ha.sa_family != dev->type)
|
|
|
|
return -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
|
|
|
|
err = PTR_ERR(neigh);
|
|
|
|
if (!IS_ERR(neigh)) {
|
|
|
|
unsigned state = NUD_STALE;
|
|
|
|
if (r->arp_flags & ATF_PERM)
|
|
|
|
state = NUD_PERMANENT;
|
|
|
|
err = neigh_update(neigh, (r->arp_flags&ATF_COM) ?
|
|
|
|
r->arp_ha.sa_data : NULL, state,
|
|
|
|
NEIGH_UPDATE_F_OVERRIDE|
|
|
|
|
NEIGH_UPDATE_F_ADMIN);
|
|
|
|
neigh_release(neigh);
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned arp_state_to_flags(struct neighbour *neigh)
|
|
|
|
{
|
|
|
|
unsigned flags = 0;
|
|
|
|
if (neigh->nud_state&NUD_PERMANENT)
|
|
|
|
flags = ATF_PERM|ATF_COM;
|
|
|
|
else if (neigh->nud_state&NUD_VALID)
|
|
|
|
flags = ATF_COM;
|
|
|
|
return flags;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get an ARP cache entry.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int arp_req_get(struct arpreq *r, struct net_device *dev)
|
|
|
|
{
|
|
|
|
u32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
|
|
|
|
struct neighbour *neigh;
|
|
|
|
int err = -ENXIO;
|
|
|
|
|
|
|
|
neigh = neigh_lookup(&arp_tbl, &ip, dev);
|
|
|
|
if (neigh) {
|
|
|
|
read_lock_bh(&neigh->lock);
|
|
|
|
memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len);
|
|
|
|
r->arp_flags = arp_state_to_flags(neigh);
|
|
|
|
read_unlock_bh(&neigh->lock);
|
|
|
|
r->arp_ha.sa_family = dev->type;
|
|
|
|
strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev));
|
|
|
|
neigh_release(neigh);
|
|
|
|
err = 0;
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int arp_req_delete(struct arpreq *r, struct net_device * dev)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
u32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
|
|
|
|
struct neighbour *neigh;
|
|
|
|
|
|
|
|
if (r->arp_flags & ATF_PUBL) {
|
|
|
|
u32 mask =
|
|
|
|
((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr;
|
|
|
|
if (mask == 0xFFFFFFFF)
|
|
|
|
return pneigh_delete(&arp_tbl, &ip, dev);
|
|
|
|
if (mask == 0) {
|
|
|
|
if (dev == NULL) {
|
|
|
|
ipv4_devconf.proxy_arp = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
2005-10-03 21:35:55 +00:00
|
|
|
if (__in_dev_get_rtnl(dev)) {
|
|
|
|
__in_dev_get_rtnl(dev)->cnf.proxy_arp = 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return -ENXIO;
|
|
|
|
}
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dev == NULL) {
|
|
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip,
|
|
|
|
.tos = RTO_ONLINK } } };
|
|
|
|
struct rtable * rt;
|
|
|
|
if ((err = ip_route_output_key(&rt, &fl)) != 0)
|
|
|
|
return err;
|
|
|
|
dev = rt->u.dst.dev;
|
|
|
|
ip_rt_put(rt);
|
|
|
|
if (!dev)
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
err = -ENXIO;
|
|
|
|
neigh = neigh_lookup(&arp_tbl, &ip, dev);
|
|
|
|
if (neigh) {
|
|
|
|
if (neigh->nud_state&~NUD_NOARP)
|
|
|
|
err = neigh_update(neigh, NULL, NUD_FAILED,
|
|
|
|
NEIGH_UPDATE_F_OVERRIDE|
|
|
|
|
NEIGH_UPDATE_F_ADMIN);
|
|
|
|
neigh_release(neigh);
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle an ARP layer I/O control request.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int arp_ioctl(unsigned int cmd, void __user *arg)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
struct arpreq r;
|
|
|
|
struct net_device *dev = NULL;
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case SIOCDARP:
|
|
|
|
case SIOCSARP:
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
case SIOCGARP:
|
|
|
|
err = copy_from_user(&r, arg, sizeof(struct arpreq));
|
|
|
|
if (err)
|
|
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (r.arp_pa.sa_family != AF_INET)
|
|
|
|
return -EPFNOSUPPORT;
|
|
|
|
|
|
|
|
if (!(r.arp_flags & ATF_PUBL) &&
|
|
|
|
(r.arp_flags & (ATF_NETMASK|ATF_DONTPUB)))
|
|
|
|
return -EINVAL;
|
|
|
|
if (!(r.arp_flags & ATF_NETMASK))
|
|
|
|
((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr =
|
|
|
|
htonl(0xFFFFFFFFUL);
|
|
|
|
rtnl_lock();
|
|
|
|
if (r.arp_dev[0]) {
|
|
|
|
err = -ENODEV;
|
|
|
|
if ((dev = __dev_get_by_name(r.arp_dev)) == NULL)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Mmmm... It is wrong... ARPHRD_NETROM==0 */
|
|
|
|
if (!r.arp_ha.sa_family)
|
|
|
|
r.arp_ha.sa_family = dev->type;
|
|
|
|
err = -EINVAL;
|
|
|
|
if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type)
|
|
|
|
goto out;
|
|
|
|
} else if (cmd == SIOCGARP) {
|
|
|
|
err = -ENODEV;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch(cmd) {
|
|
|
|
case SIOCDARP:
|
|
|
|
err = arp_req_delete(&r, dev);
|
|
|
|
break;
|
|
|
|
case SIOCSARP:
|
|
|
|
err = arp_req_set(&r, dev);
|
|
|
|
break;
|
|
|
|
case SIOCGARP:
|
|
|
|
err = arp_req_get(&r, dev);
|
|
|
|
if (!err && copy_to_user(arg, &r, sizeof(r)))
|
|
|
|
err = -EFAULT;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int arp_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
|
|
{
|
|
|
|
struct net_device *dev = ptr;
|
|
|
|
|
|
|
|
switch (event) {
|
|
|
|
case NETDEV_CHANGEADDR:
|
|
|
|
neigh_changeaddr(&arp_tbl, dev);
|
|
|
|
rt_cache_flush(0);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block arp_netdev_notifier = {
|
|
|
|
.notifier_call = arp_netdev_event,
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Note, that it is not on notifier chain.
|
|
|
|
It is necessary, that this routine was called after route cache will be
|
|
|
|
flushed.
|
|
|
|
*/
|
|
|
|
void arp_ifdown(struct net_device *dev)
|
|
|
|
{
|
|
|
|
neigh_ifdown(&arp_tbl, dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called once on startup.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static struct packet_type arp_packet_type = {
|
|
|
|
.type = __constant_htons(ETH_P_ARP),
|
|
|
|
.func = arp_rcv,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int arp_proc_init(void);
|
|
|
|
|
|
|
|
void __init arp_init(void)
|
|
|
|
{
|
|
|
|
neigh_table_init(&arp_tbl);
|
|
|
|
|
|
|
|
dev_add_pack(&arp_packet_type);
|
|
|
|
arp_proc_init();
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
neigh_sysctl_register(NULL, &arp_tbl.parms, NET_IPV4,
|
|
|
|
NET_IPV4_NEIGH, "ipv4", NULL, NULL);
|
|
|
|
#endif
|
|
|
|
register_netdevice_notifier(&arp_netdev_notifier);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
/*
|
|
|
|
* ax25 -> ASCII conversion
|
|
|
|
*/
|
|
|
|
static char *ax2asc2(ax25_address *a, char *buf)
|
|
|
|
{
|
|
|
|
char c, *s;
|
|
|
|
int n;
|
|
|
|
|
|
|
|
for (n = 0, s = buf; n < 6; n++) {
|
|
|
|
c = (a->ax25_call[n] >> 1) & 0x7F;
|
|
|
|
|
|
|
|
if (c != ' ') *s++ = c;
|
|
|
|
}
|
|
|
|
|
|
|
|
*s++ = '-';
|
|
|
|
|
|
|
|
if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
|
|
|
|
*s++ = '1';
|
|
|
|
n -= 10;
|
|
|
|
}
|
|
|
|
|
|
|
|
*s++ = n + '0';
|
|
|
|
*s++ = '\0';
|
|
|
|
|
|
|
|
if (*buf == '\0' || *buf == '-')
|
|
|
|
return "*";
|
|
|
|
|
|
|
|
return buf;
|
|
|
|
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_AX25 */
|
|
|
|
|
|
|
|
#define HBUFFERLEN 30
|
|
|
|
|
|
|
|
static void arp_format_neigh_entry(struct seq_file *seq,
|
|
|
|
struct neighbour *n)
|
|
|
|
{
|
|
|
|
char hbuffer[HBUFFERLEN];
|
|
|
|
const char hexbuf[] = "0123456789ABCDEF";
|
|
|
|
int k, j;
|
|
|
|
char tbuf[16];
|
|
|
|
struct net_device *dev = n->dev;
|
|
|
|
int hatype = dev->type;
|
|
|
|
|
|
|
|
read_lock(&n->lock);
|
|
|
|
/* Convert hardware address to XX:XX:XX:XX ... form. */
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM)
|
|
|
|
ax2asc2((ax25_address *)n->ha, hbuffer);
|
|
|
|
else {
|
|
|
|
#endif
|
|
|
|
for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) {
|
|
|
|
hbuffer[k++] = hexbuf[(n->ha[j] >> 4) & 15];
|
|
|
|
hbuffer[k++] = hexbuf[n->ha[j] & 15];
|
|
|
|
hbuffer[k++] = ':';
|
|
|
|
}
|
|
|
|
hbuffer[--k] = 0;
|
|
|
|
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->primary_key));
|
|
|
|
seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n",
|
|
|
|
tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name);
|
|
|
|
read_unlock(&n->lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void arp_format_pneigh_entry(struct seq_file *seq,
|
|
|
|
struct pneigh_entry *n)
|
|
|
|
{
|
|
|
|
struct net_device *dev = n->dev;
|
|
|
|
int hatype = dev ? dev->type : 0;
|
|
|
|
char tbuf[16];
|
|
|
|
|
|
|
|
sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->key));
|
|
|
|
seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n",
|
|
|
|
tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00",
|
|
|
|
dev ? dev->name : "*");
|
|
|
|
}
|
|
|
|
|
|
|
|
static int arp_seq_show(struct seq_file *seq, void *v)
|
|
|
|
{
|
|
|
|
if (v == SEQ_START_TOKEN) {
|
|
|
|
seq_puts(seq, "IP address HW type Flags "
|
|
|
|
"HW address Mask Device\n");
|
|
|
|
} else {
|
|
|
|
struct neigh_seq_state *state = seq->private;
|
|
|
|
|
|
|
|
if (state->flags & NEIGH_SEQ_IS_PNEIGH)
|
|
|
|
arp_format_pneigh_entry(seq, v);
|
|
|
|
else
|
|
|
|
arp_format_neigh_entry(seq, v);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void *arp_seq_start(struct seq_file *seq, loff_t *pos)
|
|
|
|
{
|
|
|
|
/* Don't want to confuse "arp -a" w/ magic entries,
|
|
|
|
* so we tell the generic iterator to skip NUD_NOARP.
|
|
|
|
*/
|
|
|
|
return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_SKIP_NOARP);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
|
|
|
|
static struct seq_operations arp_seq_ops = {
|
|
|
|
.start = arp_seq_start,
|
|
|
|
.next = neigh_seq_next,
|
|
|
|
.stop = neigh_seq_stop,
|
|
|
|
.show = arp_seq_show,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int arp_seq_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct seq_file *seq;
|
|
|
|
int rc = -ENOMEM;
|
|
|
|
struct neigh_seq_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
|
|
|
|
if (!s)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
memset(s, 0, sizeof(*s));
|
|
|
|
rc = seq_open(file, &arp_seq_ops);
|
|
|
|
if (rc)
|
|
|
|
goto out_kfree;
|
|
|
|
|
|
|
|
seq = file->private_data;
|
|
|
|
seq->private = s;
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
out_kfree:
|
|
|
|
kfree(s);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct file_operations arp_seq_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = arp_seq_open,
|
|
|
|
.read = seq_read,
|
|
|
|
.llseek = seq_lseek,
|
|
|
|
.release = seq_release_private,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init arp_proc_init(void)
|
|
|
|
{
|
|
|
|
if (!proc_net_fops_create("arp", S_IRUGO, &arp_seq_fops))
|
|
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#else /* CONFIG_PROC_FS */
|
|
|
|
|
|
|
|
static int __init arp_proc_init(void)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(arp_broken_ops);
|
|
|
|
EXPORT_SYMBOL(arp_find);
|
|
|
|
EXPORT_SYMBOL(arp_rcv);
|
|
|
|
EXPORT_SYMBOL(arp_create);
|
|
|
|
EXPORT_SYMBOL(arp_xmit);
|
|
|
|
EXPORT_SYMBOL(arp_send);
|
|
|
|
EXPORT_SYMBOL(arp_tbl);
|
|
|
|
|
|
|
|
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
|
|
|
|
EXPORT_SYMBOL(clip_tbl_hook);
|
|
|
|
#endif
|