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Annotation of qemu/net/tap-bsd.c, revision 1.1.1.3

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"
1.1.1.2   root       28: #include "qemu-error.h"
1.1       root       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: 
1.1.1.3 ! root       46: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
        !            47:     /* if no ifname is given, always start the search from tap0/tun0. */
1.1       root       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 {
1.1.1.3 ! root       55: #if defined(__OpenBSD__)
        !            56:             snprintf(dname, sizeof dname, "/dev/tun%d", i);
        !            57: #else
1.1       root       58:             snprintf(dname, sizeof dname, "/dev/tap%d", i);
1.1.1.3 ! root       59: #endif
1.1       root       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) {
1.1.1.2   root       73:         error_report("warning: could not open %s (%s): no virtual network emulation",
                     74:                    dname, strerror(errno));
1.1       root       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) {
1.1.1.2   root       94:             error_report("vnet_hdr=1 requested, but no kernel "
                     95:                          "support for IFF_VNET_HDR available");
1.1       root       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: 
1.1.1.3 ! root      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: 
1.1       root      128: void tap_fd_set_offload(int fd, int csum, int tso4,
                    129:                         int tso6, int ecn, int ufo)
                    130: {
                    131: }