NetBSD/sys/kern/uipc_domain.c

/*	$NetBSD: uipc_domain.c,v 1.49 2005/01/23 18:41:56 matt Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)uipc_domain.c	8.3 (Berkeley) 2/14/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uipc_domain.c,v 1.49 2005/01/23 18:41:56 matt Exp $");

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/sysctl.h>

void	pffasttimo(void *);
void	pfslowtimo(void *);

struct domainhead domains = STAILQ_HEAD_INITIALIZER(domains);

struct callout pffasttimo_ch, pfslowtimo_ch;

/*
 * Current time values for fast and slow timeouts.  We can use u_int
 * relatively safely.  The fast timer will roll over in 27 years and
 * the slow timer in 68 years.
 */
u_int	pfslowtimo_now;
u_int	pffasttimo_now;

void
domaininit()
{
	__link_set_decl(domains, struct domain);
	struct domain * const * dpp;
	struct domain *rt_domain = NULL;

	/*
	 * Add all of the domains.  Make sure the PF_ROUTE
	 * domain is added last.
	 */
	__link_set_foreach(dpp, domains) {
		if ((*dpp)->dom_family == PF_ROUTE)
			rt_domain = *dpp;
		else
			domain_attach(*dpp);
	}
	if (rt_domain)
		domain_attach(rt_domain);

	callout_init(&pffasttimo_ch);
	callout_init(&pfslowtimo_ch);

	callout_reset(&pffasttimo_ch, 1, pffasttimo, NULL);
	callout_reset(&pfslowtimo_ch, 1, pfslowtimo, NULL);
}

void
domain_attach(struct domain *dp)
{
	const struct protosw *pr;

	STAILQ_INSERT_TAIL(&domains, dp, dom_link);

	if (dp->dom_init)
		(*dp->dom_init)();

#ifdef MBUFTRACE
	if (dp->dom_mowner.mo_name[0] == '\0') {
		strncpy(dp->dom_mowner.mo_name, dp->dom_name,
		    sizeof(dp->dom_mowner.mo_name));
		MOWNER_ATTACH(&dp->dom_mowner);
	}
#endif
	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
		if (pr->pr_init)
			(*pr->pr_init)();
	}

	if (max_linkhdr < 16)		/* XXX */
		max_linkhdr = 16;
	max_hdr = max_linkhdr + max_protohdr;
	max_datalen = MHLEN - max_hdr;
}

struct domain *
pffinddomain(int family)
{
	struct domain *dp;

	DOMAIN_FOREACH(dp)
		if (dp->dom_family == family)
			return (dp);
	return (NULL);
}

const struct protosw *
pffindtype(int family, int type)
{
	struct domain *dp;
	const struct protosw *pr;

	dp = pffinddomain(family);
	if (dp == NULL)
		return (NULL);

	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
		if (pr->pr_type && pr->pr_type == type)
			return (pr);

	return (NULL);
}

const struct protosw *
pffindproto(int family, int protocol, int type)
{
	struct domain *dp;
	const struct protosw *pr;
	const struct protosw *maybe = NULL;

	if (family == 0)
		return (NULL);

	dp = pffinddomain(family);
	if (dp == NULL)
		return (NULL);

	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
		if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
			return (pr);

		if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
		    pr->pr_protocol == 0 && maybe == NULL)
			maybe = pr;
	}
	return (maybe);
}

SYSCTL_SETUP(sysctl_net_setup, "sysctl net subtree setup")
{
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "net", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, CTL_EOL);

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "local",
		       SYSCTL_DESCR("PF_LOCAL related settings"),
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_LOCAL, CTL_EOL);

	/*
	 * other protocols are expected to have their own setup
	 * routines that will do everything.  we end up not having
	 * anything at all to do.
	 */
}

void
pfctlinput(int cmd, struct sockaddr *sa)
{
	struct domain *dp;
	const struct protosw *pr;

	DOMAIN_FOREACH(dp)
		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			if (pr->pr_ctlinput)
				(*pr->pr_ctlinput)(cmd, sa, NULL);
}

void
pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
{
	struct domain *dp;
	const struct protosw *pr;

	if (!sa)
		return;

	DOMAIN_FOREACH(dp) {
		/*
		 * the check must be made by xx_ctlinput() anyways, to
		 * make sure we use data item pointed to by ctlparam in
		 * correct way.  the following check is made just for safety.
		 */
		if (dp->dom_family != sa->sa_family)
			continue;

		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			if (pr->pr_ctlinput)
				(*pr->pr_ctlinput)(cmd, sa, ctlparam);
	}
}

void
pfslowtimo(void *arg)
{
	struct domain *dp;
	const struct protosw *pr;

	pfslowtimo_now++;

	DOMAIN_FOREACH(dp) {
		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			if (pr->pr_slowtimo)
				(*pr->pr_slowtimo)();
	}
	callout_reset(&pfslowtimo_ch, hz / 2, pfslowtimo, NULL);
}

void
pffasttimo(void *arg)
{
	struct domain *dp;
	const struct protosw *pr;

	pffasttimo_now++;

	DOMAIN_FOREACH(dp) {
		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			if (pr->pr_fasttimo)
				(*pr->pr_fasttimo)();
	}
	callout_reset(&pffasttimo_ch, hz / 5, pffasttimo, NULL);
}