File:  [Qemu by Fabrice Bellard] / qemu / net / tap-bsd.c
Revision 1.1.1.3 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:42:29 2018 UTC (2 years, 2 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu1000, qemu0151, qemu0150, qemu0141, qemu0140, HEAD
qemu 0.14.0

    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: 
   40: int 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: 
  104: int tap_set_sndbuf(int fd, QemuOpts *opts)
  105: {
  106:     return 0;
  107: }
  108: 
  109: int tap_probe_vnet_hdr(int fd)
  110: {
  111:     return 0;
  112: }
  113: 
  114: int tap_probe_has_ufo(int fd)
  115: {
  116:     return 0;
  117: }
  118: 
  119: int tap_probe_vnet_hdr_len(int fd, int len)
  120: {
  121:     return 0;
  122: }
  123: 
  124: void tap_fd_set_vnet_hdr_len(int fd, int len)
  125: {
  126: }
  127: 
  128: void tap_fd_set_offload(int fd, int csum, int tso4,
  129:                         int tso6, int ecn, int ufo)
  130: {
  131: }

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