ip: remove ifcfg script

This script was from olden days of ifcfg.
I don't see any distribution using it and it is time to put
it out to pasture.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David Ahern <dsahern@kernel.org>
diff --git a/ip/Makefile b/ip/Makefile
index a3b4249..e27dfa0 100644
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -18,7 +18,7 @@
 include ../config.mk
 
 ALLOBJ=$(IPOBJ) $(RTMONOBJ)
-SCRIPTS=ifcfg routel routef
+SCRIPTS=routel routef
 TARGETS=ip rtmon
 
 all: $(TARGETS) $(SCRIPTS)
diff --git a/ip/ifcfg b/ip/ifcfg
deleted file mode 100755
index 5b34dec..0000000
--- a/ip/ifcfg
+++ /dev/null
@@ -1,150 +0,0 @@
-#! /bin/sh
-# SPDX-License-Identifier: GPL-2.0
-
-CheckForwarding () {
-  local sbase fwd
-  sbase=/proc/sys/net/ipv4/conf
-  fwd=0
-  if [ -d $sbase ]; then
-    for dir in $sbase/*/forwarding; do
-      fwd=$(( fwd + $(cat "$dir") ))
-    done
-  else
-    fwd=2
-  fi
-  return $fwd
-}
-
-RestartRDISC () {
-  killall -HUP rdisc || rdisc -fs
-}
-
-ABCMaskLen () {
-  local class;
-
-  class=${1%%.*}
-  if [ "$1" = "" -o $class -eq 0 -o $class -ge 224 ]; then return 0
-  elif [ $class -ge 224 ]; then return 0
-  elif [ $class -ge 192 ]; then return 24
-  elif [ $class -ge 128 ]; then return 16
-  else return 8; fi
-}
-
-label="label $1"
-ldev="$1"
-dev=${1%:*}
-if [ "$dev" = "" -o "$1" = "help" ]; then
-  echo "Usage: ifcfg DEV [[add|del [ADDR[/LEN]] [PEER] | stop]" 1>&2
-  echo "       add - add new address" 1>&2
-  echo "       del - delete address" 1>&2
-  echo "       stop - completely disable IP" 1>&2
-  exit 1
-fi
-shift
-
-CheckForwarding
-fwd=$?
-if [ $fwd -ne 0 ]; then
-  echo "Forwarding is ON or its state is unknown ($fwd). OK, No RDISC." 1>&2
-fi
-
-
-deleting=0
-case "$1" in
-add) shift ;;
-stop)
-  if [ "$ldev" != "$dev" ]; then
-    echo "Cannot stop alias $ldev" 1>&2
-    exit 1;
-  fi
-  ip -4 addr flush dev $dev $label || exit 1
-  if [ $fwd -eq 0 ]; then RestartRDISC; fi
-  exit 0 ;;
-del*)
-  deleting=1; shift ;;
-*)
-esac
-
-ipaddr=
-pfxlen=
-if [ "$1" != "" ]; then
-  ipaddr=${1%/*}
-  if [ "$1" != "$ipaddr" ]; then
-    pfxlen=${1#*/}
-  fi
-  if [ "$ipaddr" = "" ]; then
-    echo "$1 is bad IP address." 1>&2
-    exit 1
-  fi
-fi
-shift
-
-peer=$1
-if [ "$peer" != "" ]; then
-  if [ "$pfxlen" != "" -a "$pfxlen" != "32" ]; then
-    echo "Peer address with non-trivial netmask." 1>&2
-    exit 1
-  fi
-  pfx="$ipaddr peer $peer"
-else
-  if [ "$ipaddr" = "" ]; then
-    echo "Missing IP address argument." 1>&2
-    exit 1
-  fi
-  if [ "$pfxlen" = "" ]; then
-    ABCMaskLen $ipaddr
-    pfxlen=$?
-  fi
-  pfx="$ipaddr/$pfxlen"
-fi
-
-if [ "$ldev" = "$dev" -a "$ipaddr" != "" ]; then
-  label=
-fi
-
-if [ $deleting -ne 0 ]; then
-  ip addr del $pfx dev $dev $label || exit 1
-  if [ $fwd -eq 0 ]; then RestartRDISC; fi
-  exit 0
-fi
-
-
-if ! ip link set up dev $dev ; then
-  echo "Error: cannot enable interface $dev." 1>&2
-  exit 1
-fi
-if [ "$ipaddr" = "" ]; then exit 0; fi
-
-if ! arping -q -c 2 -w 3 -D -I $dev $ipaddr ; then
-  echo "Error: some host already uses address $ipaddr on $dev." 1>&2
-  exit 1
-fi
-
-if ! ip address add $pfx brd + dev $dev $label; then
-  echo "Error: failed to add $pfx on $dev." 1>&2
-  exit 1
-fi
-
-arping -q -A -c 1 -I $dev $ipaddr
-noarp=$?
-( sleep 2 ;
-  arping -q -U -c 1 -I $dev $ipaddr ) >/dev/null 2>&1 </dev/null &
-
-ip route add unreachable 224.0.0.0/24 >/dev/null 2>&1
-ip route add unreachable 255.255.255.255 >/dev/null 2>&1
-if [ "`ip link ls $dev | grep -c MULTICAST`" -ge 1 ]; then
-  ip route add 224.0.0.0/4 dev $dev scope global >/dev/null 2>&1
-fi
-
-if [ $fwd -eq 0 ]; then
-  if [ $noarp -eq 0 ]; then
-    ip ro append default dev $dev metric 30000 scope global
-  elif [ "$peer" != "" ]; then
-    if ping -q -c 2 -w 4 $peer ; then
-      ip ro append default via $peer dev $dev metric 30001
-    fi
-  fi
-  RestartRDISC
-fi
-
-exit 0
diff --git a/man/man8/ifcfg.8 b/man/man8/ifcfg.8
deleted file mode 100644
index 1a3786c..0000000
--- a/man/man8/ifcfg.8
+++ /dev/null
@@ -1,48 +0,0 @@
-.TH IFCFG 8 "September 24 2009" "iproute2" "Linux"
-.SH NAME
-ifcfg \- simplistic script which replaces ifconfig IP management
-.SH SYNOPSIS
-.ad l
-.in +8
-.ti -8
-.B ifcfg
-.RI "[ " DEVICE " ] [ " command " ] " ADDRESS " [ " PEER " ] "
-.sp
-
-.SH DESCRIPTION
-This manual page documents briefly the
-.B ifcfg
-command.
-.PP
-This is a simplistic script replacing one option of
-.B ifconfig
-, namely, IP address management. It not only adds
-addresses, but also carries out Duplicate Address Detection RFC-DHCP,
-sends unsolicited ARP to update the caches of other hosts sharing
-the interface, adds some control routes and restarts Router Discovery
-when it is necessary.
-
-.SH IFCONFIG - COMMAND SYNTAX
-
-.SS
-.TP
-.B DEVICE
-- it may have alias, suffix, separated by colon.
-
-.TP
-.B command
-- add, delete or stop.
-
-.TP
-.B ADDRESS
-- optionally followed by prefix length.
-
-.TP
-.B peer
-- optional peer address for pointpoint interfaces.
-
-.SH NOTES
-This script is not suitable for use with IPv6.
-
-.SH SEE ALSO
-.RB "IP Command reference " ip-cref.ps