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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright (c) 2012, OmniTI Computer Consulting, Inc. All rights reserved.
*/
/*
* This file implements a socketfilter used to deter TCP connections.
* To defer a connection means to delay the return of accept(3SOCKET)
* until at least one byte is ready to be read(2). This filter may be
* applied automatically or programmatically through the use of
* soconfig(1M) and setsockopt(3SOCKET).
*/
#include <sys/kmem.h>
#include <sys/systm.h>
#include <sys/stropts.h>
#include <sys/strsun.h>
#include <sys/socketvar.h>
#include <sys/sockfilter.h>
#include <sys/note.h>
#include <sys/taskq.h>
#define DATAFILT_MODULE "datafilt"
static struct modlmisc dataf_modlmisc = {
&mod_miscops,
"Kernel data-ready socket filter"
};
static struct modlinkage dataf_modlinkage = {
MODREV_1,
&dataf_modlmisc,
NULL
};
static sof_rval_t
dataf_attach_passive_cb(sof_handle_t handle, sof_handle_t ph,
void *parg, struct sockaddr *laddr, socklen_t laddrlen,
struct sockaddr *faddr, socklen_t faddrlen, void **cookiep)
{
_NOTE(ARGUNUSED(handle, ph, parg, laddr, laddrlen, faddr, faddrlen,
cookiep));
return (SOF_RVAL_DEFER);
}
static void
dataf_detach_cb(sof_handle_t handle, void *cookie, cred_t *cr)
{
_NOTE(ARGUNUSED(handle, cookie, cr));
}
static mblk_t *
dataf_data_in_cb(sof_handle_t handle, void *cookie, mblk_t *mp, int flags,
size_t *lenp)
{
_NOTE(ARGUNUSED(cookie, flags, lenp));
if (mp != NULL && MBLKL(mp) > 0) {
sof_newconn_ready(handle);
sof_bypass(handle);
}
return (mp);
}
static sof_ops_t dataf_ops = {
.sofop_attach_passive = dataf_attach_passive_cb,
.sofop_detach = dataf_detach_cb,
.sofop_data_in = dataf_data_in_cb
};
int
_init(void)
{
int err;
/*
* This module is safe to attach even after some preliminary socket
* setup calls have taken place. See the comment for SOF_ATT_SAFE.
*/
err = sof_register(SOF_VERSION, DATAFILT_MODULE, &dataf_ops,
SOF_ATT_SAFE);
if (err != 0)
return (err);
if ((err = mod_install(&dataf_modlinkage)) != 0)
(void) sof_unregister(DATAFILT_MODULE);
return (err);
}
int
_fini(void)
{
int err;
if ((err = sof_unregister(DATAFILT_MODULE)) != 0)
return (err);
return (mod_remove(&dataf_modlinkage));
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&dataf_modlinkage, modinfop));
}
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