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qemu 1.0.1

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