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