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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