sys/kern/uipc_domain.c

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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	8.2 (Berkeley) 10/18/93
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/kern/uipc_domain.c 127574 2004-03-29 17:00:05Z rwatson $");

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <vm/uma.h>

/*
 * System initialization
 *
 * Note: domain initialization takes place on a per domain basis
 * as a result of traversing a SYSINIT linker set.  Most likely,
 * each domain would want to call DOMAIN_SET(9) itself, which
 * would cause the domain to be added just after domaininit()
 * is called during startup.
 *
 * See DOMAIN_SET(9) for details on its use.
 */

static void domaininit(void *);
SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL)

static struct callout pffast_callout;
static struct callout pfslow_callout;

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

struct domain *domains;		/* registered protocol domains */
struct mtx dom_mtx;		/* domain list lock */
MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);

/*
 * Add a new protocol domain to the list of supported domains
 * Note: you cant unload it again because  a socket may be using it.
 * XXX can't fail at this time.
 */
static void
net_init_domain(struct domain *dp)
{
	struct protosw *pr;

	if (dp->dom_init)
		(*dp->dom_init)();
	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++){
		if (pr->pr_usrreqs == 0)
			panic("domaininit: %ssw[%d] has no usrreqs!",
			      dp->dom_name,
			      (int)(pr - dp->dom_protosw));
		if (pr->pr_init)
			(*pr->pr_init)();
	}
	/*
	 * update global information about maximums
	 */
	max_hdr = max_linkhdr + max_protohdr;
	max_datalen = MHLEN - max_hdr;
}

/*
 * Add a new protocol domain to the list of supported domains
 * Note: you cant unload it again because  a socket may be using it.
 * XXX can't fail at this time.
 */
void
net_add_domain(void *data)
{
	struct domain *dp;

	dp = (struct domain *)data;
	mtx_lock(&dom_mtx);
	dp->dom_next = domains;
	domains = dp;
	mtx_unlock(&dom_mtx);
	net_init_domain(dp);
}

/* ARGSUSED*/
static void
domaininit(void *dummy)
{
	/*
	 * Before we do any setup, make sure to initialize the
	 * zone allocator we get struct sockets from.
	 */

	socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
	    NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
	uma_zone_set_max(socket_zone, maxsockets);

	if (max_linkhdr < 16)		/* XXX */
		max_linkhdr = 16;

	if (debug_mpsafenet) {
		callout_init(&pffast_callout, CALLOUT_MPSAFE);
		callout_init(&pfslow_callout, CALLOUT_MPSAFE);
	} else {
		callout_init(&pffast_callout, 0);
		callout_init(&pfslow_callout, 0);
	}

	callout_reset(&pffast_callout, 1, pffasttimo, NULL);
	callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
}


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

	for (dp = domains; dp; dp = dp->dom_next)
		if (dp->dom_family == family)
			goto found;
	return (0);
found:
	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
		if (pr->pr_type && pr->pr_type == type)
			return (pr);
	return (0);
}

struct protosw *
pffindproto(family, protocol, type)
	int family;
	int protocol;
	int type;
{
	register struct domain *dp;
	register struct protosw *pr;
	struct protosw *maybe = 0;

	if (family == 0)
		return (0);
	for (dp = domains; dp; dp = dp->dom_next)
		if (dp->dom_family == family)
			goto found;
	return (0);
found:
	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 == (struct protosw *)0)
			maybe = pr;
	}
	return (maybe);
}

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

	for (dp = domains; dp; dp = dp->dom_next)
		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			if (pr->pr_ctlinput)
				(*pr->pr_ctlinput)(cmd, sa, (void *)0);
}

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

	if (!sa)
		return;
	for (dp = domains; dp; dp = dp->dom_next) {
		/*
		 * 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);
	}
}

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

	NET_ASSERT_GIANT();

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

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

	NET_ASSERT_GIANT();

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