LXR qemu/net/vde.c

   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#include "qemu/osdep.h"
  25
  26#include <libvdeplug.h>
  27
  28#include "net/net.h"
  29#include "clients.h"
  30#include "qemu-common.h"
  31#include "qemu/option.h"
  32#include "qemu/main-loop.h"
  33#include "qapi/error.h"
  34
  35typedef struct VDEState {
  36    NetClientState nc;
  37    VDECONN *vde;
  38} VDEState;
  39
  40static void vde_to_qemu(void *opaque)
  41{
  42    VDEState *s = opaque;
  43    uint8_t buf[NET_BUFSIZE];
  44    int size;
  45
  46    size = vde_recv(s->vde, (char *)buf, sizeof(buf), 0);
  47    if (size > 0) {
  48        qemu_send_packet(&s->nc, buf, size);
  49    }
  50}
  51
  52static ssize_t vde_receive(NetClientState *nc, const uint8_t *buf, size_t size)
  53{
  54    VDEState *s = DO_UPCAST(VDEState, nc, nc);
  55    ssize_t ret;
  56
  57    do {
  58      ret = vde_send(s->vde, (const char *)buf, size, 0);
  59    } while (ret < 0 && errno == EINTR);
  60
  61    return ret;
  62}
  63
  64static void vde_cleanup(NetClientState *nc)
  65{
  66    VDEState *s = DO_UPCAST(VDEState, nc, nc);
  67    qemu_set_fd_handler(vde_datafd(s->vde), NULL, NULL, NULL);
  68    vde_close(s->vde);
  69}
  70
  71static NetClientInfo net_vde_info = {
  72    .type = NET_CLIENT_DRIVER_VDE,
  73    .size = sizeof(VDEState),
  74    .receive = vde_receive,
  75    .cleanup = vde_cleanup,
  76};
  77
  78static int net_vde_init(NetClientState *peer, const char *model,
  79                        const char *name, const char *sock,
  80                        int port, const char *group, int mode, Error **errp)
  81{
  82    NetClientState *nc;
  83    VDEState *s;
  84    VDECONN *vde;
  85    char *init_group = (char *)group;
  86    char *init_sock = (char *)sock;
  87
  88    struct vde_open_args args = {
  89        .port = port,
  90        .group = init_group,
  91        .mode = mode,
  92    };
  93
  94    vde = vde_open(init_sock, (char *)"QEMU", &args);
  95    if (!vde){
  96        error_setg_errno(errp, errno, "Could not open vde");
  97        return -1;
  98    }
  99
 100    nc = qemu_new_net_client(&net_vde_info, peer, model, name);
 101
 102    snprintf(nc->info_str, sizeof(nc->info_str), "sock=%s,fd=%d",
 103             sock, vde_datafd(vde));
 104
 105    s = DO_UPCAST(VDEState, nc, nc);
 106
 107    s->vde = vde;
 108
 109    qemu_set_fd_handler(vde_datafd(s->vde), vde_to_qemu, NULL, s);
 110
 111    return 0;
 112}
 113
 114int net_init_vde(const Netdev *netdev, const char *name,
 115                 NetClientState *peer, Error **errp)
 116{
 117    const NetdevVdeOptions *vde;
 118
 119    assert(netdev->type == NET_CLIENT_DRIVER_VDE);
 120    vde = &netdev->u.vde;
 121
 122    /* missing optional values have been initialized to "all bits zero" */
 123    if (net_vde_init(peer, "vde", name, vde->sock, vde->port, vde->group,
 124                     vde->has_mode ? vde->mode : 0700, errp) == -1) {
 125        return -1;
 126    }
 127
 128    return 0;
 129}
 130