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Date: Wed, 06 Jun 2007 08:44:10 +0200
From: Roar Bjørgum Rotvik <roarbr@...lde.org>
To: Anton <Anton.Uzunov@...o.defence.gov.au>
CC: netdev@...r.kernel.org
Subject: Re: sending IPv6 packets via kern_sendmsg
Anton wrote:
> Hi,
>
> Following on from a previous (now lost :-)) posting, I have been trying
> to send out IPv6 packets from a kernel module using the kern_sendmsg()
> function. Since in theory I need this function to be started in
> interrupt context (actually, softirq context), but since this is
> impossible because kern_sendmsg() needs to sleep, I have created a work
> queue which calls the kern_sendmsg() function separately. The work queue
> is scheduled from the softirq context (actually, at the moment this
> happens from a Netfilter hook). The work queue function creates a msghdr
> structure, fills in a sin6_addr structure, calls sock_create_kern() and
> then uses this socket to send an IPv6 packet, which consists of a header
> (struct ipv6hdr *iphdr) and some data following on from this. The above
> packet is placed in the msghdr structure by setting (after the
> appropriate initializations):
> msg.msg_iov->iov_base = (char *) ip6hdr;
> msg.msg_iov->iov_len = sizeof( struct ipv6hdr + ntohs(
> ip6hdr->payload_len ) );
Shouldn't this be:
msg.msg_iov->iov_len = sizeof (struct ipv6hdr) + ntohs (ip6hdr->payload_len);
Seems you use sizeof (nthos (...)), and that seems wrong.
--
Roar B. Rotvik
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