Annotation of qemu/net/tap-bsd.c, revision 1.1
1.1 ! root 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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