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Subject[PATCH] arp_filter patch for 2.4.4 kernel.
This patch is ported from Andi Kleen's work for the 2.2.19 kernel (I think
it was his, at least...)

It adds the ability to run multiple interfaces on the same subnet,
on the same machine, and have the ARPs for each interface be answered
based on whether or not the kernel would route a packet from the ARP'd
IP out that interface. When used with source-based routing, this
makes things work in an intuitive manner.

I find this a vital feature for one of my projects, and would welcome
it's inclusion into the 2.4 kernel series!

The code seems to be working on my two test machines..

Thanks,
Ben


diff -u -r -N -X /home/greear/exclude.list linux/include/linux/inetdevice.h linux.dev/include/linux/inetdevice.h
--- linux/include/linux/inetdevice.h Mon Aug 23 10:01:02 1999
+++ linux.dev/include/linux/inetdevice.h Wed May 2 23:04:58 2001
@@ -17,6 +17,7 @@
int forwarding;
int mc_forwarding;
int tag;
+ int arp_filter;
void *sysctl;
};

@@ -53,6 +54,9 @@
(ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
|| (!IN_DEV_FORWARD(in_dev) && \
(ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
+
+#define IN_DEV_ARPFILTER(in_dev) (ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
+

struct in_ifaddr
{
diff -u -r -N -X /home/greear/exclude.list linux/include/linux/sysctl.h linux.dev/include/linux/sysctl.h
--- linux/include/linux/sysctl.h Fri Apr 27 15:48:20 2001
+++ linux.dev/include/linux/sysctl.h Wed May 2 23:52:46 2001
@@ -324,7 +324,8 @@
NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE=9,
NET_IPV4_CONF_BOOTP_RELAY=10,
NET_IPV4_CONF_LOG_MARTIANS=11,
- NET_IPV4_CONF_TAG=12
+ NET_IPV4_CONF_TAG=12,
+ NET_IPV4_CONF_ARPFILTER=13
};

/* /proc/sys/net/ipv6 */
diff -u -r -N -X /home/greear/exclude.list linux/include/net/snmp.h linux.dev/include/net/snmp.h
--- linux/include/net/snmp.h Fri Apr 27 15:48:20 2001
+++ linux.dev/include/net/snmp.h Wed May 2 23:54:14 2001
@@ -198,7 +198,8 @@
unsigned long RcvPruned;
unsigned long OfoPruned;
unsigned long OutOfWindowIcmps;
- unsigned long LockDroppedIcmps;
+ unsigned long LockDroppedIcmps;
+ unsigned long ArpFilter;
unsigned long TimeWaited;
unsigned long TimeWaitRecycled;
unsigned long TimeWaitKilled;
diff -u -r -N -X /home/greear/exclude.list linux/net/ipv4/arp.c linux.dev/net/ipv4/arp.c
--- linux/net/ipv4/arp.c Thu Apr 12 12:11:39 2001
+++ linux.dev/net/ipv4/arp.c Thu May 3 00:13:37 2001
@@ -343,6 +343,26 @@
read_unlock_bh(&neigh->lock);
}

+static int arp_filter(__u32 sip, __u32 tip, struct net_device *dev)
+{
+ struct rtable *rt;
+ int flag = 0;
+ /*unsigned long now; */
+
+ if (ip_route_output(&rt, sip, tip, 0, 0) < 0)
+ return 1;
+ if (rt->u.dst.dev != dev) {
+ /* TODO: Figure out what this is supposed to do and re-insert it:
+ *
+ * net_statistics.ArpFilter++;
+ *
+ */
+ flag = 1;
+ }
+ ip_rt_put(rt);
+ return flag;
+}
+
/* OBSOLETE FUNCTIONS */

/*
@@ -739,7 +759,13 @@
if (addr_type == RTN_LOCAL) {
n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
if (n) {
- arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
+ int dont_send = 0;
+ if (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;
diff -u -r -N -X /home/greear/exclude.list linux/net/ipv4/devinet.c linux.dev/net/ipv4/devinet.c
--- linux/net/ipv4/devinet.c Sun Mar 25 19:14:25 2001
+++ linux.dev/net/ipv4/devinet.c Wed May 2 23:27:47 2001
@@ -1016,7 +1016,7 @@
static struct devinet_sysctl_table
{
struct ctl_table_header *sysctl_header;
- ctl_table devinet_vars[13];
+ ctl_table devinet_vars[14];
ctl_table devinet_dev[2];
ctl_table devinet_conf_dir[2];
ctl_table devinet_proto_dir[2];
@@ -1059,7 +1059,10 @@
{NET_IPV4_CONF_TAG, "tag",
&ipv4_devconf.tag, sizeof(int), 0644, NULL,
&proc_dointvec},
- {0}},
+ {NET_IPV4_CONF_ARPFILTER, "arp_filter",
+ &ipv4_devconf.arp_filter, sizeof(int), 0644, NULL,
+ &proc_dointvec},
+ {0}},

{{NET_PROTO_CONF_ALL, "all", NULL, 0, 0555, devinet_sysctl.devinet_vars},{0}},
{{NET_IPV4_CONF, "conf", NULL, 0, 0555, devinet_sysctl.devinet_dev},{0}},
diff -u -r -N -X /home/greear/exclude.list linux/net/ipv4/proc.c linux.dev/net/ipv4/proc.c
--- linux/net/ipv4/proc.c Thu Aug 10 13:01:26 2000
+++ linux.dev/net/ipv4/proc.c Wed May 2 23:12:57 2001
@@ -170,7 +170,7 @@
len = sprintf(buffer,
"TcpExt: SyncookiesSent SyncookiesRecv SyncookiesFailed"
" EmbryonicRsts PruneCalled RcvPruned OfoPruned"
- " OutOfWindowIcmps LockDroppedIcmps"
+ " OutOfWindowIcmps LockDroppedIcmps ArpFilter"
" TW TWRecycled TWKilled"
" PAWSPassive PAWSActive PAWSEstab"
" DelayedACKs DelayedACKLocked DelayedACKLost"
--
Ben Greear <greearb@candelatech.com> <Ben_Greear@excite.com>
President of Candela Technologies Inc http://www.candelatech.com
ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
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