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 *vc;
  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->vc, buf, size);
  50     }
  51 }
  52
  53 static ssize_t vde_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
  54 {
  55     VDEState *s = vc->opaque;
  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 *vc)
  66 {
  67     VDEState *s = vc->opaque;
  68     qemu_set_fd_handler(vde_datafd(s->vde), NULL, NULL, NULL);
  69     vde_close(s->vde);
  70     qemu_free(s);
  71 }
  72
  73 static int net_vde_init(VLANState *vlan, const char *model,
  74                         const char *name, const char *sock,
  75                         int port, const char *group, int mode)
  76 {
  77     VDEState *s;
  78     char *init_group = (char *)group;
  79     char *init_sock = (char *)sock;
  80
  81     struct vde_open_args args = {
  82         .port = port,
  83         .group = init_group,
  84         .mode = mode,
  85     };
  86
  87     s = qemu_mallocz(sizeof(VDEState));
  88     s->vde = vde_open(init_sock, (char *)"QEMU", &args);
  89     if (!s->vde){
  90         free(s);
  91         return -1;
  92     }
  93     s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_VDE,
  94                                  vlan, NULL, model, name, NULL,
  95                                  vde_receive, NULL, NULL,
  96                                  vde_cleanup, s);
  97     qemu_set_fd_handler(vde_datafd(s->vde), vde_to_qemu, NULL, s);
  98     snprintf(s->vc->info_str, sizeof(s->vc->info_str), "sock=%s,fd=%d",
  99              sock, vde_datafd(s->vde));
 100     return 0;
 101 }
 102
 103 int net_init_vde(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
 104 {
 105     const char *sock;
 106     const char *group;
 107     int port, mode;
 108
 109     sock  = qemu_opt_get(opts, "sock");
 110     group = qemu_opt_get(opts, "group");
 111
 112     port = qemu_opt_get_number(opts, "port", 0);
 113     mode = qemu_opt_get_number(opts, "mode", 0700);
 114
 115     if (net_vde_init(vlan, "vde", name, sock, port, group, mode) == -1) {
 116         return -1;
 117     }
 118
 119     if (vlan) {
 120         vlan->nb_host_devs++;
 121     }
 122
 123     return 0;
 124 }