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 "net/vde.h"
  25
  26 #include "config-host.h"
  27
  28 #include <libvdeplug.h>
  29
  30 #include "net.h"
  31 #include "qemu-char.h"
  32 #include "qemu-common.h"
  33 #include "qemu-option.h"
  34 #include "sysemu.h"
  35
  36 typedef struct VDEState {
  37     VLANClientState nc;
  38     VDECONN *vde;
  39 } VDEState;
  40
  41 static void vde_to_qemu(void *opaque)
  42 {
  43     VDEState *s = opaque;
  44     uint8_t buf[4096];
  45     int size;
  46
  47     size = vde_recv(s->vde, (char *)buf, sizeof(buf), 0);
  48     if (size > 0) {
  49         qemu_send_packet(&s->nc, buf, size);
  50     }
  51 }
  52
  53 static ssize_t vde_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
  54 {
  55     VDEState *s = DO_UPCAST(VDEState, nc, nc);
  56     ssize_t ret;
  57
  58     do {
  59       ret = vde_send(s->vde, (const char *)buf, size, 0);
  60     } while (ret < 0 && errno == EINTR);
  61
  62     return ret;
  63 }
  64
  65 static void vde_cleanup(VLANClientState *nc)
  66 {
  67     VDEState *s = DO_UPCAST(VDEState, nc, nc);
  68     qemu_set_fd_handler(vde_datafd(s->vde), NULL, NULL, NULL);
  69     vde_close(s->vde);
  70 }
  71
  72 static NetClientInfo net_vde_info = {
  73     .type = NET_CLIENT_TYPE_VDE,
  74     .size = sizeof(VDEState),
  75     .receive = vde_receive,
  76     .cleanup = vde_cleanup,
  77 };
  78
  79 static int net_vde_init(VLANState *vlan, const char *model,
  80                         const char *name, const char *sock,
  81                         int port, const char *group, int mode)
  82 {
  83     VLANClientState *nc;
  84     VDEState *s;
  85     VDECONN *vde;
  86     char *init_group = (char *)group;
  87     char *init_sock = (char *)sock;
  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         return -1;
  98     }
  99
 100     nc = qemu_new_net_client(&net_vde_info, vlan, NULL, 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
 114 int net_init_vde(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
 115 {
 116     const char *sock;
 117     const char *group;
 118     int port, mode;
 119
 120     sock  = qemu_opt_get(opts, "sock");
 121     group = qemu_opt_get(opts, "group");
 122
 123     port = qemu_opt_get_number(opts, "port", 0);
 124     mode = qemu_opt_get_number(opts, "mode", 0700);
 125
 126     if (net_vde_init(vlan, "vde", name, sock, port, group, mode) == -1) {
 127         return -1;
 128     }
 129
 130     if (vlan) {
 131         vlan->nb_host_devs++;
 132     }
 133
 134     return 0;
 135 }