[Qemu-devel] [PATCH] specify vmchannel as a net option

[Gleb Natapov]

Signed-off-by: Gleb Natapov <address@hidden>
diff --git a/net.c b/net.c
index e7c097e..4149615 100644
--- a/net.c
+++ b/net.c
@@ -657,6 +657,23 @@ void do_info_slirp(void)
     slirp_stats();
 }
 
+struct VMChannel {
+    CharDriverState *hd;
+    int port;
+} *vmchannels;
+
+static int vmchannel_can_read(void *opaque)
+{
+    struct VMChannel *vmc = (struct VMChannel*)opaque;
+    return slirp_socket_can_recv(4, vmc->port);
+}
+
+static void vmchannel_read(void *opaque, const uint8_t *buf, int size)
+{
+    struct VMChannel *vmc = (struct VMChannel*)opaque;
+    slirp_socket_recv(4, vmc->port, buf, size);
+}
+
 #endif /* CONFIG_SLIRP */
 
 #if !defined(_WIN32)
@@ -1605,6 +1622,30 @@ int net_client_init(const char *device, const char *p)
         }
         vlan->nb_host_devs++;
         ret = net_slirp_init(vlan, device, name);
+    } else if (!strcmp(device, "channel")) {
+        long port;
+        char name[20], *devname;
+        struct VMChannel *vmc;
+
+        port = strtol(p, &devname, 10);
+        devname++;
+        if (port < 1 || port > 65535) {
+            fprintf(stderr, "vmchannel wrong port number\n"); 
+            return -1;
+        }
+        vmc = malloc(sizeof(struct VMChannel));
+        snprintf(name, 20, "vmchannel%ld", port);
+        vmc->hd = qemu_chr_open(name, devname, NULL);
+        if (!vmc->hd) {
+            fprintf(stderr, "qemu: could not open vmchannel device"
+                    "'%s'\n", devname);
+            return -1;
+        }
+        vmc->port = port;
+        slirp_add_exec(3, vmc->hd, 4, port);
+        qemu_chr_add_handlers(vmc->hd, vmchannel_can_read, vmchannel_read,
+                NULL, vmc);
+        ret = 0;
     } else
 #endif
 #ifdef _WIN32
diff --git a/qemu-doc.texi b/qemu-doc.texi
index efb88d2..8322a08 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -643,6 +643,9 @@ Use the user mode network stack which requires no 
administrator
 privilege to run.  @option{hostname=name} can be used to specify the client
 hostname reported by the builtin DHCP server.
 
address@hidden -net channel,@var{port}:@var{dev}
+Forward @option{user} TCP connection to port @var{port} to character device 
@var{dev}
+
 @item -net 
tap[,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden
 Connect the host TAP network interface @var{name} to VLAN @var{n}, use
 the network script @var{file} to configure it and the network script 
--
                        Gleb.