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#!/usr/bin/perl -w
#
# module to find and store exisiting vti tunnels.
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2012 Vyatta, Inc.
# All Rights Reserved.
#
# Authors: Saurabh Mohan
# Date: 2012
# Description: Find and store exisiting vti tunnels
#
# **** End License ****
#
#
package vtiIntf;
use strict;
# Collect set of existing Vti's.
my %existingVtiName = ();
my %existingVtiMark = ();
my @VtiMarks;
my $vtiMarkBase = 0x90000000;
my $maxMarks = 2048;
sub discoverVtiIntfs {
my @currentVtis = `/sbin/ip tunnel | grep "^vti"`;
if (@currentVtis != 0) {
my ($remote, $local, $name, $mark);
my $key;
foreach my $curVti (@currentVtis) {
($remote, $local, $name, $mark) = parseVtiTun($curVti);
$key = "remote $remote local $local";
$existingVtiName{$key} = $name;
$existingVtiMark{$key} = $mark;
$VtiMarks[$mark-$vtiMarkBase] = 1;
}
}
}
#
# Api takes as input the o/p of 'ip tunnel show' and
# returns a list with {remote,local,name,mark}
# Example input:
# vti2: ip/ip remote 12.0.0.2 local 12.0.0.1 ttl inherit nopmtudisc key 15
#
sub parseVtiTun {
my ($tunop) = @_;
my ($tunName, $remote, $local, $mark);
if ($tunop =~ m/(^vti.*): .*/) {
$tunName = $1;
}
if ($tunop =~ m/remote ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/) {
$remote = $1;
}
if ($tunop =~ m/local ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/) {
$local = $1;
}
if ($tunop =~ m/key ([0-9\.]+)/) {
$mark = $1;
}
return($remote, $local, $tunName, $mark);
}
sub extractRemoteLocal {
my ($key) = @_;
my ($remote, $local);
if ($key =~ m/remote ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/) {
$remote = $1;
}
if ($key =~ m/local ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/) {
$local = $1;
}
return($remote, $local);
}
sub isVtinamepresent {
my ($remote, $local) = @_;
my $key = "remote $remote local $local";
if (exists $existingVtiName{$key} ) {
return $existingVtiName{$key};
}
return "";
}
#
# Pass a referenct to the existing Vti names.
#
sub getVtiNames {
return (\%existingVtiName);
}
sub deleteVtinamepresent {
my ($remote, $local) = @_;
my $key = "remote $remote local $local";
if (exists $existingVtiName{$key} ) {
delete $existingVtiName{$key};
}
}
sub isVtimarkpresent {
my ($remote, $local) = @_;
my $key = "remote $remote local $local";
if (exists $existingVtiMark{$key} ) {
return $existingVtiMark{$key};
}
return "";
}
sub allocVtiMark {
for my $cmark (1 .. ($maxMarks-1)) {
if (! defined($VtiMarks[$cmark])) {
$VtiMarks[$cmark] = 1;
return $cmark + $vtiMarkBase ;
}
}
return 0;
}
sub freeVtiMark {
my ($freeMark) = @_;
if ($freeMark > 0 && $freeMark < $maxMarks) {
$VtiMarks[$freeMark] = 0;
}
return 0;
}
1;
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