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/*
* Copyright (c) 1997-1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* This is the DPF analog to the Simple Packet Filter interface. For
* an example, see oskit/examples/x86/more/dpf_com.c.
*/
#ifndef OSKIT
#define OSKIT
#define DEFINED_OSKIT_IN_DPF
#endif
#include <oskit/dev/dev.h>
#include <oskit/dev/net.h>
#include <oskit/io/netio.h>
#include <oskit/c/string.h>
#include <oskit/c/stdlib.h>
#include <oskit/dpf.h> /* for oskit_dpf_iptr() */
#include <stdio.h>
struct dpfdata {
oskit_netio_t *netio;
oskit_s32_t *ppid;
};
/*
* This is the function that does the filtering. The param
* is the dpfdata created when the dpf netio was created.
*/
static oskit_error_t
filter_func(void *param, oskit_bufio_t *b, oskit_size_t pkt_size)
{
struct dpfdata *data = (struct dpfdata *)param;
char *pkt;
unsigned char *upkt;
int err;
err = oskit_bufio_map(b, (void **)&pkt, 0, pkt_size);
upkt = (unsigned char *)pkt;
osenv_assert(!err);
#if 0
printf("===============================\n\
%x-%x-%x-%x-%x-%x\n\
%x-%x-%x-%x-%x-%x\n\
%x, %x,\n\
\n\
%d, %d,\n\
%x, %x\n",\
upkt[0], upkt[1], upkt[2], upkt[3], upkt[4], upkt[5],
upkt[6], upkt[7], upkt[8], upkt[9], upkt[10], upkt[11],
upkt[12], upkt[13],
upkt[14], upkt[15],
upkt[16], upkt[17]);
#endif
err = oskit_dpf_iptr(pkt, pkt_size);
*data->ppid = err;
if (err != 0) {
/* Matches, call the netio's push routine.
* Pid set above after call to oskit_dpf_iptr().
*/
oskit_netio_push(data->netio, b, pkt_size);
}
/* if doesn't match, just return */
err = oskit_bufio_unmap(b, (void *)pkt, 0, pkt_size);
osenv_assert(!err);
return 0;
}
/*
* This is called when the netio object created is no longer used.
* We `cleanup' -- release the storage, since there are
* no more references to it anyway.
*/
static void
cleanup(void *param)
{
osenv_mem_free(param, 0, sizeof(struct dpfdata));
}
/*
* This function creates a DPF netio. When a matching packet comes in,
* we'll set *pid to the pid matched by the filter and call out_netio.
*/
int
oskit_netio_dpf_create(int *ppid,
oskit_netio_t *out_netio,
oskit_netio_t **push_netio)
{
struct dpfdata *data;
oskit_netio_t *pnetio;
data = osenv_mem_alloc(sizeof(*data), 0, 0);
if (!data)
return OSKIT_ENOMEM;
data->netio = out_netio;
data->ppid = ppid;
/*
* Create a netio that calls filter_func when it receives
* a packet with 'data' as the parameter.
*/
pnetio = oskit_netio_create_cleanup(filter_func, data, cleanup);
if (!pnetio)
return OSKIT_E_UNEXPECTED; /* XXX */
*push_netio = pnetio;
return 0;
}
#undef printf()
#ifdef DEFINED_OSKIT_IN_DPF
#undef OSKIT
#undef DEFINED_OSKIT_IN_DPF
#endif
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