[Qemu-devel] tun/tap patch for OSX

[Qemu-devel] tun/tap patch for OSX

[Lev Lvovsky]

The following patch provided by Mattias Nissler, and tweaked by myself  
to be applied to net.c (previously to vl.c) allows qemu to use the tun/ 
tap devices provided at Mattias' site (http:// 
tuntaposx.sourceforge.net).

Mattias is CC'd.

thanks,
-lev

----
bash-3.2$ svn diff net.c
Index: net.c
===================================================================
--- net.c       (revision 6082)
+++ net.c       (working copy)
@@ -686,8 +686,36 @@
      snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d",  
fd);
      return s;
  }
+#if defined(__APPLE__)
+static int tap_open(char *ifname, int ifname_size)
+{
+    int fd;
+    int i = 0;
+    char *dev;
+    char buf[20];
+    struct stat s;

-#if defined (_BSD) || defined (__FreeBSD_kernel__)
+    while (1) {
+        snprintf(buf, 20, "/dev/tap%d", i);
+        fd = open(buf, O_RDWR);
+        if (fd < 0) {
+            if (errno != EBUSY) {
+                fprintf(stderr, "warning: could not open %s: no  
virtual network emulation\n", buf);
+                return -1;
+            }
+            i++;
+        } else
+            break;
+    }
+
+    fstat(fd, &s);
+    dev = devname(s.st_rdev, S_IFCHR);
+    pstrcpy(ifname, ifname_size, dev);
+
+    fcntl(fd, F_SETFL, O_NONBLOCK);
+    return fd;
+}
+#elif defined (_BSD) || defined (__FreeBSD_kernel__)
  static int tap_open(char *ifname, int ifname_size)
  {
      int fd;

Re: [Qemu-devel] tun/tap patch for OSX

[Lev Lvovsky]

Any interest in this guys?

To my knowledge, Mattias' tun/tap kernel extension is the only way to  
get tun/tap working in OSX.

thanks,
-lev

On Dec 28, 2008, at 10:11 PM, Lev Lvovsky wrote:

> The following patch provided by Mattias Nissler, and tweaked by  
> myself to be applied to net.c (previously to vl.c) allows qemu to  
> use the tun/tap devices provided at Mattias' site (http://tuntaposx.sourceforge.net 
> ).
>
> Mattias is CC'd.
>
> thanks,
> -lev
>
> ----
> bash-3.2$ svn diff net.c
> Index: net.c
> ===================================================================
> --- net.c       (revision 6082)
> +++ net.c       (working copy)
> @@ -686,8 +686,36 @@
>     snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d",  
> fd);
>     return s;
> }
> +#if defined(__APPLE__)
> +static int tap_open(char *ifname, int ifname_size)
> +{
> +    int fd;
> +    int i = 0;
> +    char *dev;
> +    char buf[20];
> +    struct stat s;
>
> -#if defined (_BSD) || defined (__FreeBSD_kernel__)
> +    while (1) {
> +        snprintf(buf, 20, "/dev/tap%d", i);
> +        fd = open(buf, O_RDWR);
> +        if (fd < 0) {
> +            if (errno != EBUSY) {
> +                fprintf(stderr, "warning: could not open %s: no  
> virtual network emulation\n", buf);
> +                return -1;
> +            }
> +            i++;
> +        } else
> +            break;
> +    }
> +
> +    fstat(fd, &s);
> +    dev = devname(s.st_rdev, S_IFCHR);
> +    pstrcpy(ifname, ifname_size, dev);
> +
> +    fcntl(fd, F_SETFL, O_NONBLOCK);
> +    return fd;
> +}
> +#elif defined (_BSD) || defined (__FreeBSD_kernel__)
> static int tap_open(char *ifname, int ifname_size)
> {
>     int fd;
>
>

Re: [Qemu-devel] tun/tap patch for OSX

[C.W. Betts]

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If we do commit this, there should be a way to check and see of these  
kernel modules are installed.
On Jan 5, 2009, at 11:11 AM, Lev Lvovsky wrote:

> Any interest in this guys?
>
> To my knowledge, Mattias' tun/tap kernel extension is the only way  
> to get tun/tap working in OSX.
>
> thanks,
> -lev
>
> On Dec 28, 2008, at 10:11 PM, Lev Lvovsky wrote:
>
>> The following patch provided by Mattias Nissler, and tweaked by  
>> myself to be applied to net.c (previously to vl.c) allows qemu to  
>> use the tun/tap devices provided at Mattias' site (http://tuntaposx.sourceforge.net 
>> ).
>>
>> Mattias is CC'd.
>>
>> thanks,
>> -lev
>>
>> ----
>> bash-3.2$ svn diff net.c
>> Index: net.c
>> ===================================================================
>> --- net.c       (revision 6082)
>> +++ net.c       (working copy)
>> @@ -686,8 +686,36 @@
>>    snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d",  
>> fd);
>>    return s;
>> }
>> +#if defined(__APPLE__)
>> +static int tap_open(char *ifname, int ifname_size)
>> +{
>> +    int fd;
>> +    int i = 0;
>> +    char *dev;
>> +    char buf[20];
>> +    struct stat s;
>>
>> -#if defined (_BSD) || defined (__FreeBSD_kernel__)
>> +    while (1) {
>> +        snprintf(buf, 20, "/dev/tap%d", i);
>> +        fd = open(buf, O_RDWR);
>> +        if (fd < 0) {
>> +            if (errno != EBUSY) {
>> +                fprintf(stderr, "warning: could not open %s: no  
>> virtual network emulation\n", buf);
>> +                return -1;
>> +            }
>> +            i++;
>> +        } else
>> +            break;
>> +    }
>> +
>> +    fstat(fd, &s);
>> +    dev = devname(s.st_rdev, S_IFCHR);
>> +    pstrcpy(ifname, ifname_size, dev);
>> +
>> +    fcntl(fd, F_SETFL, O_NONBLOCK);
>> +    return fd;
>> +}
>> +#elif defined (_BSD) || defined (__FreeBSD_kernel__)
>> static int tap_open(char *ifname, int ifname_size)
>> {
>>    int fd;
>>
>>
>
>
>


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Re: [Qemu-devel] tun/tap patch for OSX

[Anthony Liguori]

Lev Lvovsky wrote:
> The following patch provided by Mattias Nissler, and tweaked by myself 
> to be applied to net.c (previously to vl.c) allows qemu to use the 
> tun/tap devices provided at Mattias' site 
> (http://tuntaposx.sourceforge.net).

Needs a valid Signed-off-by along with appropriate documentation 
pointing users to tuntaposx.

Regards,

Anthony Liguori

> Mattias is CC'd.
>
> thanks,
> -lev
>
> ----
> bash-3.2$ svn diff net.c
> Index: net.c
> ===================================================================
> --- net.c       (revision 6082)
> +++ net.c       (working copy)
> @@ -686,8 +686,36 @@
>      snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", 
> fd);
>      return s;
>  }
> +#if defined(__APPLE__)
> +static int tap_open(char *ifname, int ifname_size)
> +{
> +    int fd;
> +    int i = 0;
> +    char *dev;
> +    char buf[20];
> +    struct stat s;
>
> -#if defined (_BSD) || defined (__FreeBSD_kernel__)
> +    while (1) {
> +        snprintf(buf, 20, "/dev/tap%d", i);
> +        fd = open(buf, O_RDWR);
> +        if (fd < 0) {
> +            if (errno != EBUSY) {
> +                fprintf(stderr, "warning: could not open %s: no 
> virtual network emulation\n", buf);
> +                return -1;
> +            }
> +            i++;
> +        } else
> +            break;
> +    }
> +
> +    fstat(fd, &s);
> +    dev = devname(s.st_rdev, S_IFCHR);
> +    pstrcpy(ifname, ifname_size, dev);
> +
> +    fcntl(fd, F_SETFL, O_NONBLOCK);
> +    return fd;
> +}
> +#elif defined (_BSD) || defined (__FreeBSD_kernel__)
>  static int tap_open(char *ifname, int ifname_size)
>  {
>      int fd;
>
>
>