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writev fails on tun

Subject: writev fails on tun
From: anil kumar dahiya <email@hidden>
Date: Tue, 4 Apr 2006 03:21:02 -0700 (PDT)
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ifconfig on my system shows that :

tun0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.13.76 --> 192.168.11.76 netmask 0xffffff00
open (pid 583)

I am writting data to tun device as :

        u_int32_t type;
        struct iovec iv[2];
        struct ip *iph;

iph = (struct ip *) buf;
printf(" write tun IN");

type = htonl (AF_INET);

        iv[0].iov_base = &type;
        iv[0].iov_len = sizeof (type);
        iv[0].iov_base = buf;
        iv[0].iov_len = len;
        openbsd_modify_read_write_return (writev (fd, iv, 2));

But when i do dmesg:

it shows that :

tun: could not determine the ip version

Can anyone suggest where thinges are going wrong.

--- Anil

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