How to debug "Malformed Packet (Exception occurred)" when send a udp packet?

[Kristof Provost]

On 2014-09-07 17:12:33 (+0800), lx <lxlenovostar at gmail.com> wrote:
>       I want to send a udp packet in kernel module. the codes is:
Why?

> // iph->version = 4; iph->ihl = 5;
> put_unaligned(0x45, (unsigned char *)send_iph);
> send_iph->tos      = 0;
> put_unaligned(htons(iph_len), &(send_iph->tot_len));
                ^- That's probably your problem.

Regards,
Kristof