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 "config-host.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
  33 typedef struct VDEState {
  34     NetClientState nc;
  35     VDECONN *vde;
  36 } VDEState;
  37
  38 static void vde_to_qemu(void *opaque)
  39 {
  40     VDEState *s = opaque;
  41     uint8_t buf[4096];
  42     int size;
  43
  44     size = vde_recv(s->vde, (char *)buf, sizeof(buf), 0);
  45     if (size > 0) {
  46         qemu_send_packet(&s->nc, buf, size);
  47     }
  48 }
  49
  50 static ssize_t vde_receive(NetClientState *nc, const uint8_t *buf, size_t size)
  51 {
  52     VDEState *s = DO_UPCAST(VDEState, nc, nc);
  53     ssize_t ret;
  54
  55     do {
  56       ret = vde_send(s->vde, (const char *)buf, size, 0);
  57     } while (ret < 0 && errno == EINTR);
  58
  59     return ret;
  60 }
  61
  62 static void vde_cleanup(NetClientState *nc)
  63 {
  64     VDEState *s = DO_UPCAST(VDEState, nc, nc);
  65     qemu_set_fd_handler(vde_datafd(s->vde), NULL, NULL, NULL);
  66     vde_close(s->vde);
  67 }
  68
  69 static NetClientInfo net_vde_info = {
  70     .type = NET_CLIENT_OPTIONS_KIND_VDE,
  71     .size = sizeof(VDEState),
  72     .receive = vde_receive,
  73     .cleanup = vde_cleanup,
  74 };
  75
  76 static int net_vde_init(NetClientState *peer, const char *model,
  77                         const char *name, const char *sock,
  78                         int port, const char *group, int mode)
  79 {
  80     NetClientState *nc;
  81     VDEState *s;
  82     VDECONN *vde;
  83     char *init_group = (char *)group;
  84     char *init_sock = (char *)sock;
  85
  86     struct vde_open_args args = {
  87         .port = port,
  88         .group = init_group,
  89         .mode = mode,
  90     };
  91
  92     vde = vde_open(init_sock, (char *)"QEMU", &args);
  93     if (!vde){
  94         return -1;
  95     }
  96
  97     nc = qemu_new_net_client(&net_vde_info, peer, model, name);
  98
  99     snprintf(nc->info_str, sizeof(nc->info_str), "sock=%s,fd=%d",
 100              sock, vde_datafd(vde));
 101
 102     s = DO_UPCAST(VDEState, nc, nc);
 103
 104     s->vde = vde;
 105
 106     qemu_set_fd_handler(vde_datafd(s->vde), vde_to_qemu, NULL, s);
 107
 108     return 0;
 109 }
 110
 111 int net_init_vde(const NetClientOptions *opts, const char *name,
 112                  NetClientState *peer)
 113 {
 114     const NetdevVdeOptions *vde;
 115
 116     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_VDE);
 117     vde = opts->vde;
 118
 119     /* missing optional values have been initialized to "all bits zero" */
 120     if (net_vde_init(peer, "vde", name, vde->sock, vde->port, vde->group,
 121                      vde->has_mode ? vde->mode : 0700) == -1) {
 122         return -1;
 123     }
 124
 125     return 0;
 126 }