route_ipv4.c

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/*
 * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * 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 any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdio.h>
#include <ipxe/netdevice.h>
#include <ipxe/ip.h>
#include <usr/route.h>

/** @file
 *
 * IPv4 routing management
 *
 */

/**
 * Print IPv4 routing table
 *
 * @v netdev            Network device
 */
static void route_ipv4_print ( struct net_device *netdev ) {
        struct ipv4_miniroute *miniroute;
        struct ipv4_miniroute *defroute;
        struct in_addr address;
        struct in_addr network;
        struct in_addr netmask;
        struct in_addr gateway;
        int remote;

        /* Print routing table */
        list_for_each_entry ( miniroute, &ipv4_miniroutes, list ) {

                /* Skip non-matching network devices */
                if ( miniroute->netdev != netdev )
                        continue;
                address = miniroute->address;
                network = miniroute->network;
                netmask = miniroute->netmask;
                gateway = miniroute->gateway;
                assert ( ( network.s_addr & ~netmask.s_addr ) == 0 );

                /* Defer default routes to be printed with local addresses */
                if ( ! netmask.s_addr )
                        continue;

                /* Print local address and destination subnet */
                remote = ( ( address.s_addr ^ network.s_addr ) &
                           netmask.s_addr );
                printf ( "%s: %s", netdev->name, inet_ntoa ( address ) );
                if ( remote )
                        printf ( " for %s", inet_ntoa ( network ) );
                printf ( "/%s", inet_ntoa ( netmask ) );
                if ( gateway.s_addr )
                        printf ( " gw %s", inet_ntoa ( gateway ) );

                /* Print default routes with local subnets */
                list_for_each_entry ( defroute, &ipv4_miniroutes, list ) {
                        if ( ( defroute->netdev == netdev ) &&
                             ( defroute->address.s_addr = address.s_addr ) &&
                             ( ! defroute->netmask.s_addr ) && ( ! remote ) ) {
                                printf ( " gw %s",
                                         inet_ntoa ( defroute->gateway ) );
                        }
                }

                /* Print trailer */
                if ( ! netdev_is_open ( netdev ) )
                        printf ( " (inaccessible)" );
                printf ( "\n" );
        }
}

/** IPv4 routing family */
struct routing_family ipv4_routing_family __routing_family ( ROUTING_IPV4 ) = {
        .print = route_ipv4_print,
};