Date: Tue, 30 Dec 2008 17:16:52 +0000 From: Ferner Cilloniz <fernercc@gmail.com> To: freebsd-net@freebsd.org Subject: Re: kernel network Message-ID: <1230657412.4966.24.camel@mobiliare.Belkin> In-Reply-To: <alpine.BSF.2.00.0812301837170.40328@fledge.watson.org> References: <1230637795.4966.20.camel@mobiliare.Belkin> <200812301905.57164.max@love2party.net> <alpine.BSF.2.00.0812301837170.40328@fledge.watson.org>
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I have been tackling this today. This is what i have so far:
-------------------------------------------------------------------------
static int my_udp_send(struct thread *td, void *syscall_args)
{
struct socket *sock = NULL;
if( socreate(AF_INET, &sock, SOCK_DGRAM, 0, td->td_proc->p_ucred,
td) != 0 ) {
uprintf("socreate() returned error\n");
return -1;
}
struct sockaddr sa;
sa.sa_len = sizeof(struct sockaddr_in);
struct sockaddr_in *sin = (struct sockaddr_in *)&sa;
sin->sin_family = AF_INET;
inet_aton("192.168.2.2", (struct sockaddr_in *)&sin->sin_addr);
sin->sin_port = htons(8080);
sin->sin_len = sizeof(*sin);
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
// int soconnect_error = soconnect(sock, (struct sockaddr *)sin, td);
// uprintf("soconnect(): %d\n", soconnect_error);
struct mbuf *top = m_getclr(M_TRYWAIT, MT_CONTROL);
// IP is 0
int sosend_error = sosend(sock, (struct sockaddr *)sin, NULL, top,
NULL, 0, td);
uprintf("sosend(): %d\n", sosend_error);
soclose(sock);
return 0;
}
-------------------------------------------------------------------------
However, when listening to my home network using wireshark, I filter out
everything but UDP packets with the 192.168.2.2 address on them. I'm
afraid to say that there aren't any packets showing.
Am i doing something wrong? Note, that I am not filling in the mbuf and
all the wacking casting done.
Thanks.
On Tue, 2008-12-30 at 18:46 +0000, Robert Watson wrote:
> On Tue, 30 Dec 2008, Max Laier wrote:
>
> > On Tuesday 30 December 2008 12:49:55 Ferner Cilloniz wrote:
> >
> >> I do not think I could ever be more tired of this topic but I cannot seem
> >> to understand what to do. I have tried more about a month now to send
> >> arbitrary UDP packets from a kernel module but cannot achieve it. I have
> >> looked at udp_send but found that building a socket* was much to tedious.
> >> Later i looked at in-kernel webservers (http://openketa.sourceforge.net/)
> >> but could not find anything useful.
> >>
> >> Netgraph is a possibility, but there isn't any documentation on accessing
> >> the network from kernel space.
> >>
> >> What do you all suggest?
> >
> > $ man 9 socket
>
> Definitely the preferred solution, if it meets the application model. Call
> socreate(9) to allocate the socket, sobind(9) if required, calls to sosend(9)
> to generate packets, and soclose(9) when done. Direct calls to the
> udp_output() and udp_send() functions won't work without a socket context, and
> doing sosend(9) will isolate in-kernel consumers from future changes in UDP
> internals. ip_output() could be invoked directly to generate IP packets, but
> won't allow you to easily receive replies, etc.
>
> Robert N M Watson
> Computer Laboratory
> University of Cambridge
--
Cilloniz Bicchi, Ferner
Research Assistant
Dept. of Computer Sciences
The University of Texas at Austin
http://www.cs.utexas.edu/~fernercc
fernercc@cs.utexas.edu
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