[Patch] Allows tun_mainloop to handle multiple packets in single read.

[David Woodhouse]

On Wed, 2011-11-23 at 01:43 +0900, Kazuyoshi Aizawa wrote:
> +                       while (left > 0){
> +                               int iplen;
> +                               iphdr = (struct ip *) pkt;
> +                               iplen = ntohs(iphdr->ip_len); 

What guarantee is thare that 'left' is more than one byte, if it's
non-zero? You're reading bytes 3 and 4... and for IPv6 we'll need to
read bytes 5 and 6.

If that's something that's guaranteed, that's fine. Otherwise, we'll
need to cope with the case where we have read *something* of the next
packet, but not yet enough to know its length.

-- 
dwmw2
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