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 "tap_int.h"
  26 #include "qemu-common.h"
  27 #include "sysemu/sysemu.h"
  28 #include "qemu/error-report.h"
  29
  30 #ifdef __NetBSD__
  31 #include <sys/ioctl.h>
  32 #include <net/if.h>
  33 #include <net/if_tap.h>
  34 #endif
  35
  36 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
  37              int vnet_hdr_required, int mq_required)
  38 {
  39     int fd;
  40 #ifdef TAPGIFNAME
  41     struct ifreq ifr;
  42 #else
  43     char *dev;
  44     struct stat s;
  45 #endif
  46
  47 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
  48     /* if no ifname is given, always start the search from tap0/tun0. */
  49     int i;
  50     char dname[100];
  51
  52     for (i = 0; i < 10; i++) {
  53         if (*ifname) {
  54             snprintf(dname, sizeof dname, "/dev/%s", ifname);
  55         } else {
  56 #if defined(__OpenBSD__)
  57             snprintf(dname, sizeof dname, "/dev/tun%d", i);
  58 #else
  59             snprintf(dname, sizeof dname, "/dev/tap%d", i);
  60 #endif
  61         }
  62         TFR(fd = open(dname, O_RDWR));
  63         if (fd >= 0) {
  64             break;
  65         }
  66         else if (errno == ENXIO || errno == ENOENT) {
  67             break;
  68         }
  69         if (*ifname) {
  70             break;
  71         }
  72     }
  73     if (fd < 0) {
  74         error_report("warning: could not open %s (%s): no virtual network emulation",
  75                    dname, strerror(errno));
  76         return -1;
  77     }
  78 #else
  79     TFR(fd = open("/dev/tap", O_RDWR));
  80     if (fd < 0) {
  81         fprintf(stderr,
  82             "warning: could not open /dev/tap: no virtual network emulation: %s\n",
  83             strerror(errno));
  84         return -1;
  85     }
  86 #endif
  87
  88 #ifdef TAPGIFNAME
  89     if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
  90         fprintf(stderr, "warning: could not get tap name: %s\n",
  91             strerror(errno));
  92         return -1;
  93     }
  94     pstrcpy(ifname, ifname_size, ifr.ifr_name);
  95 #else
  96     if (fstat(fd, &s) < 0) {
  97         fprintf(stderr,
  98             "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
  99             strerror(errno));
 100         return -1;
 101     }
 102     dev = devname(s.st_rdev, S_IFCHR);
 103     pstrcpy(ifname, ifname_size, dev);
 104 #endif
 105
 106     if (*vnet_hdr) {
 107         /* BSD doesn't have IFF_VNET_HDR */
 108         *vnet_hdr = 0;
 109
 110         if (vnet_hdr_required && !*vnet_hdr) {
 111             error_report("vnet_hdr=1 requested, but no kernel "
 112                          "support for IFF_VNET_HDR available");
 113             close(fd);
 114             return -1;
 115         }
 116     }
 117     fcntl(fd, F_SETFL, O_NONBLOCK);
 118     return fd;
 119 }
 120
 121 int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
 122 {
 123     return 0;
 124 }
 125
 126 int tap_probe_vnet_hdr(int fd)
 127 {
 128     return 0;
 129 }
 130
 131 int tap_probe_has_ufo(int fd)
 132 {
 133     return 0;
 134 }
 135
 136 int tap_probe_vnet_hdr_len(int fd, int len)
 137 {
 138     return 0;
 139 }
 140
 141 void tap_fd_set_vnet_hdr_len(int fd, int len)
 142 {
 143 }
 144
 145 void tap_fd_set_offload(int fd, int csum, int tso4,
 146                         int tso6, int ecn, int ufo)
 147 {
 148 }
 149
 150 int tap_fd_enable(int fd)
 151 {
 152     return -1;
 153 }
 154
 155 int tap_fd_disable(int fd)
 156 {
 157     return -1;
 158 }
 159
 160 int tap_fd_get_ifname(int fd, char *ifname)
 161 {
 162     return -1;
 163 }