File:  [Qemu by Fabrice Bellard] / qemu / net / tap-bsd.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:42:32 2018 UTC (2 years, 2 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0125, qemu0124, qemu0123, qemu0122, qemu0121, qemu0120, HEAD
qemu 0.12.0

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

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