From 267072f91c36769a3994a91f21382a9acc77974b Mon Sep 17 00:00:00 2001
From: brooks <brooks@FreeBSD.org>
Date: Mon, 14 Nov 2005 23:34:50 +0000
Subject: Add a new configuration variable, ipv4_addrs_<ifn>, which adds one or
 more IPv4 address from a ranged list in CIRD notation:

ipv4_addrs_ed0="192.168.0.1/24 192.168.1.1-5/28"

In the process move alias processing into new ipv4_up/down functions to
more toward a less IPv4 centric world.

Submitted by:	Philipp Wuensche <cryx dash freebsd at h3q dot com>
---
 etc/network.subr | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'etc/network.subr')

diff --git a/etc/network.subr b/etc/network.subr
index d5a1703..5eccd53 100644
--- a/etc/network.subr
+++ b/etc/network.subr
@@ -198,6 +198,64 @@ wpaif()
 	return 1
 }
 
+# ipv4_up if
+#  add IPv4 addresses to the interface $if 
+ipv4_up()
+{
+	_if=$1
+	ifalias_up ${_if}
+	ipv4_addrs_common ${_if} alias
+}
+
+# ipv4_down if
+#  remove IPv4 addresses from the interface $if
+ipv4_down()
+{
+	_if=$1
+	ifalias_down ${_if}
+	ipv4_addrs_common ${_if} -alias
+}
+
+# ipv4_addrs_common if action
+#   Evaluate the ifconfig_if_ipv4 arguments for interface $if
+#   and use $action to add or remove IPv4 addresses from $if.
+ipv4_addrs_common()
+{  
+	_ret=1
+	_if=$1
+	_action=$2
+    
+	# get ipv4-addresses
+	eval cidr_addr=\${ipv4_addrs_${_if}}
+    
+	for _cidr in ${cidr_addr}; do
+		_ipaddr=${_cidr%%/*}
+		_netmask="/"${_cidr##*/}
+		_range=${_ipaddr##*.}
+		_ipnet=${_ipaddr%.*}
+		_iplow=${_range%-*}
+		_iphigh=${_range#*-}
+
+		# clear netmask when removing aliases
+		if [ "${_action}" = "-alias" ]; then
+			_netmask=""
+		fi
+        
+		_ipcount=${_iplow}
+		while [ "${_ipcount}" -le "${_iphigh}" ]; do
+			eval "ifconfig ${_if} ${_action} ${_ipnet}.${_ipcount}${_netmask}"
+			_ipcount=$((${_ipcount}+1))
+			_ret=0
+
+			# only the first ipaddr in a subnet need the real netmask
+			if [ "${_action}" != "-alias" ]; then
+				_netmask="/32"
+			fi
+		done
+	done
+	return $_ret
+}
+
 # ifalias_up if
 #	Configure aliases for network interface $if.
 #	It returns 0 if at least one alias was configured or
-- 
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