LXR qemu/net/tap-bsd.c

   1/*
   2 * QEMU System Emulator
   3 *
   4 * Copyright (c) 2003-2008 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "net/tap.h"
  26#include "qemu-common.h"
  27#include "sysemu.h"
  28#include "qemu-error.h"
  29
  30#ifdef __NetBSD__
  31#include <net/if_tap.h>
  32#endif
  33
  34#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  35#include <libutil.h>
  36#else
  37#include <util.h>
  38#endif
  39
  40int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
  41{
  42    int fd;
  43    char *dev;
  44    struct stat s;
  45
  46#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
  47    /* if no ifname is given, always start the search from tap0/tun0. */
  48    int i;
  49    char dname[100];
  50
  51    for (i = 0; i < 10; i++) {
  52        if (*ifname) {
  53            snprintf(dname, sizeof dname, "/dev/%s", ifname);
  54        } else {
  55#if defined(__OpenBSD__)
  56            snprintf(dname, sizeof dname, "/dev/tun%d", i);
  57#else
  58            snprintf(dname, sizeof dname, "/dev/tap%d", i);
  59#endif
  60        }
  61        TFR(fd = open(dname, O_RDWR));
  62        if (fd >= 0) {
  63            break;
  64        }
  65        else if (errno == ENXIO || errno == ENOENT) {
  66            break;
  67        }
  68        if (*ifname) {
  69            break;
  70        }
  71    }
  72    if (fd < 0) {
  73        error_report("warning: could not open %s (%s): no virtual network emulation",
  74                   dname, strerror(errno));
  75        return -1;
  76    }
  77#else
  78    TFR(fd = open("/dev/tap", O_RDWR));
  79    if (fd < 0) {
  80        fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
  81        return -1;
  82    }
  83#endif
  84
  85    fstat(fd, &s);
  86    dev = devname(s.st_rdev, S_IFCHR);
  87    pstrcpy(ifname, ifname_size, dev);
  88
  89    if (*vnet_hdr) {
  90        /* BSD doesn't have IFF_VNET_HDR */
  91        *vnet_hdr = 0;
  92
  93        if (vnet_hdr_required && !*vnet_hdr) {
  94            error_report("vnet_hdr=1 requested, but no kernel "
  95                         "support for IFF_VNET_HDR available");
  96            close(fd);
  97            return -1;
  98        }
  99    }
 100    fcntl(fd, F_SETFL, O_NONBLOCK);
 101    return fd;
 102}
 103
 104int tap_set_sndbuf(int fd, QemuOpts *opts)
 105{
 106    return 0;
 107}
 108
 109int tap_probe_vnet_hdr(int fd)
 110{
 111    return 0;
 112}
 113
 114int tap_probe_has_ufo(int fd)
 115{
 116    return 0;
 117}
 118
 119int tap_probe_vnet_hdr_len(int fd, int len)
 120{
 121    return 0;
 122}
 123
 124void tap_fd_set_vnet_hdr_len(int fd, int len)
 125{
 126}
 127
 128void tap_fd_set_offload(int fd, int csum, int tso4,
 129                        int tso6, int ecn, int ufo)
 130{
 131}
 132