hi,

> --- netinet/ip_output.c	15 Dec 2004 04:25:19 -0000	1.138
> +++ netinet/ip_output.c	5 Feb 2005 18:14:51 -0000
> @@ -128,6 +128,8 @@
>  #include <netinet/in_pcb.h>
>  #include <netinet/in_var.h>
>  #include <netinet/ip_var.h>
> +#include <netinet/tcp.h>
> +#include <netinet/udp.h>

why you need these includes?  isn't m_pkthdr.csum_data enough?

> +				th = (struct tcphdr *) (mtod(m, caddr_t) +
> +				     hlen);
> +				th->th_sum = in_cksum_phdr(ip->ip_src.s_addr,

i don't think you can assume m->m_len is large enough.

YAMAMOTO Takashi