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Annotation of qemu/net/tap-bsd.c, revision 1.1.1.1

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: }