Annotation of qemu/net/tap-bsd.c, revision 1.1.1.4

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__
1.1.1.4 ! root       31: #include <sys/ioctl.h>
        !            32: #include <net/if.h>
1.1       root       33: #include <net/if_tap.h>
                     34: #endif
                     35: 
                     36: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
                     37: #include <libutil.h>
                     38: #else
                     39: #include <util.h>
                     40: #endif
                     41: 
                     42: int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
                     43: {
                     44:     int fd;
1.1.1.4 ! root       45: #ifdef TAPGIFNAME
        !            46:     struct ifreq ifr;
        !            47: #else
1.1       root       48:     char *dev;
                     49:     struct stat s;
1.1.1.4 ! root       50: #endif
1.1       root       51: 
1.1.1.3   root       52: #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
                     53:     /* if no ifname is given, always start the search from tap0/tun0. */
1.1       root       54:     int i;
                     55:     char dname[100];
                     56: 
                     57:     for (i = 0; i < 10; i++) {
                     58:         if (*ifname) {
                     59:             snprintf(dname, sizeof dname, "/dev/%s", ifname);
                     60:         } else {
1.1.1.3   root       61: #if defined(__OpenBSD__)
                     62:             snprintf(dname, sizeof dname, "/dev/tun%d", i);
                     63: #else
1.1       root       64:             snprintf(dname, sizeof dname, "/dev/tap%d", i);
1.1.1.3   root       65: #endif
1.1       root       66:         }
                     67:         TFR(fd = open(dname, O_RDWR));
                     68:         if (fd >= 0) {
                     69:             break;
                     70:         }
                     71:         else if (errno == ENXIO || errno == ENOENT) {
                     72:             break;
                     73:         }
                     74:         if (*ifname) {
                     75:             break;
                     76:         }
                     77:     }
                     78:     if (fd < 0) {
1.1.1.2   root       79:         error_report("warning: could not open %s (%s): no virtual network emulation",
                     80:                    dname, strerror(errno));
1.1       root       81:         return -1;
                     82:     }
                     83: #else
                     84:     TFR(fd = open("/dev/tap", O_RDWR));
                     85:     if (fd < 0) {
1.1.1.4 ! root       86:         fprintf(stderr,
        !            87:             "warning: could not open /dev/tap: no virtual network emulation: %s\n",
        !            88:             strerror(errno));
1.1       root       89:         return -1;
                     90:     }
                     91: #endif
                     92: 
1.1.1.4 ! root       93: #ifdef TAPGIFNAME
        !            94:     if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) {
        !            95:         fprintf(stderr, "warning: could not get tap name: %s\n",
        !            96:             strerror(errno));
        !            97:         return -1;
        !            98:     }
        !            99:     pstrcpy(ifname, ifname_size, ifr.ifr_name);
        !           100: #else
        !           101:     if (fstat(fd, &s) < 0) {
        !           102:         fprintf(stderr,
        !           103:             "warning: could not stat /dev/tap: no virtual network emulation: %s\n",
        !           104:             strerror(errno));
        !           105:         return -1;
        !           106:     }
1.1       root      107:     dev = devname(s.st_rdev, S_IFCHR);
                    108:     pstrcpy(ifname, ifname_size, dev);
1.1.1.4 ! root      109: #endif
1.1       root      110: 
                    111:     if (*vnet_hdr) {
                    112:         /* BSD doesn't have IFF_VNET_HDR */
                    113:         *vnet_hdr = 0;
                    114: 
                    115:         if (vnet_hdr_required && !*vnet_hdr) {
1.1.1.2   root      116:             error_report("vnet_hdr=1 requested, but no kernel "
                    117:                          "support for IFF_VNET_HDR available");
1.1       root      118:             close(fd);
                    119:             return -1;
                    120:         }
                    121:     }
                    122:     fcntl(fd, F_SETFL, O_NONBLOCK);
                    123:     return fd;
                    124: }
                    125: 
                    126: int tap_set_sndbuf(int fd, QemuOpts *opts)
                    127: {
                    128:     return 0;
                    129: }
                    130: 
                    131: int tap_probe_vnet_hdr(int fd)
                    132: {
                    133:     return 0;
                    134: }
                    135: 
                    136: int tap_probe_has_ufo(int fd)
                    137: {
                    138:     return 0;
                    139: }
                    140: 
1.1.1.3   root      141: int tap_probe_vnet_hdr_len(int fd, int len)
                    142: {
                    143:     return 0;
                    144: }
                    145: 
                    146: void tap_fd_set_vnet_hdr_len(int fd, int len)
                    147: {
                    148: }
                    149: 
1.1       root      150: void tap_fd_set_offload(int fd, int csum, int tso4,
                    151:                         int tso6, int ecn, int ufo)
                    152: {
                    153: }

unix.superglobalmegacorp.com