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
  35 typedef struct VDEState {
  36     NetClientState nc;
  37     VDECONN *vde;
  38 } VDEState;
  39
  40 static 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
  52 static 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
  64 static 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
  71 static NetClientInfo net_vde_info = {
  72     .type = NET_CLIENT_DRIVER_VDE,
  73     .size = sizeof(VDEState),
  74     .receive = vde_receive,
  75     .cleanup = vde_cleanup,
  76 };
  77
  78 static 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     NetdevVdeOptions *stored;
  88
  89     struct vde_open_args args = {
  90         .port = port,
  91         .group = init_group,
  92         .mode = mode,
  93     };
  94
  95     vde = vde_open(init_sock, (char *)"QEMU", &args);
  96     if (!vde){
  97         error_setg_errno(errp, errno, "Could not open vde");
  98         return -1;
  99     }
 100
 101     nc = qemu_new_net_client(&net_vde_info, peer, model, name);
 102
 103     s = DO_UPCAST(VDEState, nc, nc);
 104
 105     s->vde = vde;
 106
 107     qemu_set_fd_handler(vde_datafd(s->vde), vde_to_qemu, NULL, s);
 108
 109     /* Store startup parameters */
 110     nc->stored_config = g_new0(NetdevInfo, 1);
 111     nc->stored_config->type = NET_BACKEND_VDE;
 112     stored = &nc->stored_config->u.vde;
 113
 114     if (sock) {
 115         stored->has_sock = true;
 116         stored->sock = g_strdup(sock);
 117     }
 118
 119     stored->has_port = true;
 120     stored->port = port;
 121
 122     if (group) {
 123         stored->has_group = true;
 124         stored->group = g_strdup(group);
 125     }
 126
 127     stored->has_mode = true;
 128     stored->mode = mode;
 129
 130     return 0;
 131 }
 132
 133 int net_init_vde(const Netdev *netdev, const char *name,
 134                  NetClientState *peer, Error **errp)
 135 {
 136     const NetdevVdeOptions *vde;
 137
 138     assert(netdev->type == NET_CLIENT_DRIVER_VDE);
 139     vde = &netdev->u.vde;
 140
 141     /* missing optional values have been initialized to "all bits zero" */
 142     if (net_vde_init(peer, "vde", name, vde->sock, vde->port, vde->group,
 143                      vde->has_mode ? vde->mode : 0700, errp) == -1) {
 144         return -1;
 145     }
 146
 147     return 0;
 148 }