300 lines
6.6 KiB
C
300 lines
6.6 KiB
C
/*
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* Copyright (C) 2008 Tobias Brunner
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* Copyright (C) 2007 Martin Willi
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* HSR Hochschule fuer Technik Rapperswil
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* Copyright (C) 2002 Jeff Dike
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*
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* Based on the "tunctl" utility from Jeff Dike.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
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#include <linux/if_tun.h>
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#include <utils/debug.h>
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#include <collections/linked_list.h>
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#include "iface.h"
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typedef struct private_iface_t private_iface_t;
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struct private_iface_t {
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/** public interface */
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iface_t public;
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/** device name in guest (eth0) */
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char *guestif;
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/** device name at host (tap0) */
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char *hostif;
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/** bridge this interface is attached to */
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bridge_t *bridge;
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/** guest this interface is attached to */
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guest_t *guest;
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/** mconsole for guest */
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mconsole_t *mconsole;
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};
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/**
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* bring an interface up or down (host side)
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*/
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bool iface_control(char *name, bool up)
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{
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int s;
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bool good = FALSE;
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (!s)
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{
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return FALSE;
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}
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if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0)
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{
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if (up)
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{
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ifr.ifr_flags |= IFF_UP;
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}
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else
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{
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ifr.ifr_flags &= ~IFF_UP;
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}
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if (ioctl(s, SIOCSIFFLAGS, &ifr) == 0)
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{
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good = TRUE;
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}
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}
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close(s);
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return good;
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}
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METHOD(iface_t, get_guestif, char*,
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private_iface_t *this)
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{
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return this->guestif;
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}
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METHOD(iface_t, get_hostif, char*,
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private_iface_t *this)
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{
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return this->hostif;
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}
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METHOD(iface_t, add_address, bool,
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private_iface_t *this, host_t *addr, int bits)
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{
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return (this->guest->exec(this->guest, NULL, NULL,
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"exec ip addr add %H/%d dev %s", addr, bits, this->guestif) == 0);
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}
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/**
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* compile a list of the addresses of an interface
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*/
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static void compile_address_list(linked_list_t *list, char *address)
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{
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host_t *host = host_create_from_string(address, 0);
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if (host)
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{
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list->insert_last(list, host);
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}
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}
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/**
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* delete the list of addresses
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*/
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static void destroy_address_list(linked_list_t *list)
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{
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list->destroy_offset(list, offsetof(host_t, destroy));
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}
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METHOD(iface_t, create_address_enumerator, enumerator_t*,
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private_iface_t *this)
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{
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linked_list_t *addresses = linked_list_create();
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this->guest->exec_str(this->guest, (void(*)(void*,char*))compile_address_list,
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TRUE, addresses,
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"exec ip addr list dev %s scope global | "
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"grep '^ \\+\\(inet6\\? \\)' | "
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"awk -F '( +|/)' '{ print $3 }'", this->guestif);
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return enumerator_create_cleaner(addresses->create_enumerator(addresses),
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(void(*)(void*))destroy_address_list, addresses);
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}
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METHOD(iface_t, delete_address, bool,
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private_iface_t *this, host_t *addr, int bits)
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{
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return (this->guest->exec(this->guest, NULL, NULL,
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"exec ip addr del %H/%d dev %s", addr, bits, this->guestif) == 0);
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}
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METHOD(iface_t, set_bridge, void,
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private_iface_t *this, bridge_t *bridge)
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{
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if (this->bridge == NULL && bridge)
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{
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this->guest->exec(this->guest, NULL, NULL,
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"exec ip link set %s up", this->guestif);
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}
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else if (this->bridge && bridge == NULL)
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{
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this->guest->exec(this->guest, NULL, NULL,
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"exec ip link set %s down", this->guestif);
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}
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this->bridge = bridge;
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}
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METHOD(iface_t, get_bridge, bridge_t*,
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private_iface_t *this)
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{
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return this->bridge;
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}
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METHOD(iface_t, get_guest, guest_t*,
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private_iface_t *this)
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{
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return this->guest;
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}
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/**
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* destroy the tap device
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*/
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static bool destroy_tap(private_iface_t *this)
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{
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struct ifreq ifr;
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int tap;
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if (!iface_control(this->hostif, FALSE))
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{
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DBG1(DBG_LIB, "bringing iface down failed: %m");
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}
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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strncpy(ifr.ifr_name, this->hostif, sizeof(ifr.ifr_name) - 1);
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tap = open(TAP_DEVICE, O_RDWR);
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if (tap < 0)
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{
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DBG1(DBG_LIB, "unable to open tap device %s: %m", TAP_DEVICE);
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return FALSE;
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}
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if (ioctl(tap, TUNSETIFF, &ifr) < 0 ||
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ioctl(tap, TUNSETPERSIST, 0) < 0)
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{
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DBG1(DBG_LIB, "removing %s failed: %m", this->hostif);
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close(tap);
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return FALSE;
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}
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close(tap);
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return TRUE;
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}
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/**
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* create the tap device
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*/
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static char* create_tap(private_iface_t *this)
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{
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struct ifreq ifr;
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int tap;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s-%s",
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this->guest->get_name(this->guest), this->guestif);
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tap = open(TAP_DEVICE, O_RDWR);
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if (tap < 0)
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{
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DBG1(DBG_LIB, "unable to open tap device %s: %m", TAP_DEVICE);
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return NULL;
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}
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if (ioctl(tap, TUNSETIFF, &ifr) < 0 ||
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ioctl(tap, TUNSETPERSIST, 1) < 0 ||
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ioctl(tap, TUNSETOWNER, 0))
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{
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DBG1(DBG_LIB, "creating new tap device failed: %m");
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close(tap);
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return NULL;
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}
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close(tap);
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return strdup(ifr.ifr_name);
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}
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METHOD(iface_t, destroy, void,
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private_iface_t *this)
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{
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if (this->bridge)
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{
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this->bridge->disconnect_iface(this->bridge, &this->public);
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}
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/* TODO: iface mgmt is not blocking yet, so wait some ticks */
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usleep(50000);
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this->mconsole->del_iface(this->mconsole, this->guestif);
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destroy_tap(this);
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free(this->guestif);
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free(this->hostif);
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free(this);
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}
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/**
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* create the iface instance
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*/
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iface_t *iface_create(char *name, guest_t *guest, mconsole_t *mconsole)
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{
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private_iface_t *this;
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INIT(this,
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.public = {
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.get_hostif = _get_hostif,
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.get_guestif = _get_guestif,
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.add_address = _add_address,
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.create_address_enumerator = _create_address_enumerator,
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.delete_address = _delete_address,
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.set_bridge = _set_bridge,
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.get_bridge = _get_bridge,
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.get_guest = _get_guest,
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.destroy = _destroy,
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},
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.mconsole = mconsole,
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.guestif = strdup(name),
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.guest = guest,
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);
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this->hostif = create_tap(this);
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if (this->hostif == NULL)
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{
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destroy_tap(this);
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free(this->guestif);
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free(this);
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return NULL;
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}
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if (!this->mconsole->add_iface(this->mconsole, this->guestif, this->hostif))
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{
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DBG1(DBG_LIB, "creating interface '%s' in guest failed", this->guestif);
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destroy_tap(this);
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free(this->guestif);
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free(this->hostif);
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free(this);
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return NULL;
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}
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if (!iface_control(this->hostif, TRUE))
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{
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DBG1(DBG_LIB, "bringing iface '%s' up failed: %m", this->hostif);
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}
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return &this->public;
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}
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