Archipelago » qemu

/*

 * QEMU System Emulator

 *

 * Copyright (c) 2003-2008 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "net/tap.h"

#include "qemu-common.h"

#include "sysemu.h"

#include "qemu-error.h"

#ifdef __NetBSD__

#include <sys/ioctl.h>

#include <net/if.h>

#include <net/if_tap.h>

#endif

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)

#include <libutil.h>

#else

#include <util.h>

#endif

int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)

{

    int fd;

#ifdef TAPGIFNAME

    struct ifreq ifr;

#else

    char *dev;

    struct stat s;

#endif

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)

    /* if no ifname is given, always start the search from tap0/tun0. */

    int i;

    char dname[100];

    for (i = 0; i < 10; i++) {

        if (*ifname) {

            snprintf(dname, sizeof dname, "/dev/%s", ifname);

        } else {

#if defined(__OpenBSD__)

            snprintf(dname, sizeof dname, "/dev/tun%d", i);

#else

            snprintf(dname, sizeof dname, "/dev/tap%d", i);

#endif

        }

        TFR(fd = open(dname, O_RDWR));

        if (fd >= 0) {

            break;

        }

        else if (errno == ENXIO || errno == ENOENT) {

            break;

        }

        if (*ifname) {

            break;

        }

    }

    if (fd < 0) {

        error_report("warning: could not open %s (%s): no virtual network emulation",

                   dname, strerror(errno));

        return -1;

    }

#else

    TFR(fd = open("/dev/tap", O_RDWR));

    if (fd < 0) {

        fprintf(stderr,

            "warning: could not open /dev/tap: no virtual network emulation: %s\n",

            strerror(errno));

        return -1;

    }

#endif

#ifdef TAPGIFNAME

    if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {

        fprintf(stderr, "warning: could not get tap name: %s\n",

            strerror(errno));

        return -1;

    }

    pstrcpy(ifname, ifname_size, ifr.ifr_name);

#else

    if (fstat(fd, &s) < 0) {

        fprintf(stderr,

            "warning: could not stat /dev/tap: no virtual network emulation: %s\n",

            strerror(errno));

        return -1;

    }

    dev = devname(s.st_rdev, S_IFCHR);

    pstrcpy(ifname, ifname_size, dev);

#endif

    if (*vnet_hdr) {

        /* BSD doesn't have IFF_VNET_HDR */

        *vnet_hdr = 0;

        if (vnet_hdr_required && !*vnet_hdr) {

            error_report("vnet_hdr=1 requested, but no kernel "

                         "support for IFF_VNET_HDR available");

            close(fd);

            return -1;

        }

    }

    fcntl(fd, F_SETFL, O_NONBLOCK);

    return fd;

}

int tap_set_sndbuf(int fd, QemuOpts *opts)

{

    return 0;

}

int tap_probe_vnet_hdr(int fd)

{

    return 0;

}

int tap_probe_has_ufo(int fd)

{

    return 0;

}

int tap_probe_vnet_hdr_len(int fd, int len)

{

    return 0;

}

void tap_fd_set_vnet_hdr_len(int fd, int len)

{

}

void tap_fd_set_offload(int fd, int csum, int tso4,

                        int tso6, int ecn, int ufo)

{

}