/*
 * 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	8.2 (Berkeley) 10/18/93
 * $FreeBSD: src/sys/kern/uipc_domain.c,v 1.22.2.1 2001/07/03 11:01:37 ume Exp $
 */

#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/socketvar.h>
#include <sys/socketops.h>
#include <sys/systm.h>
#include <vm/vm_zone.h>

#include <sys/thread2.h>

/*
 * System initialization
 *
 * Note: domain initialization wants to take place on a per domain basis
 * as a result of traversing a linker set.  Most likely, each domain
 * want to call a registration function rather than being handled here
 * in domaininit().  Probably this will look like:
 *
 * SYSINIT(unique, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, domain_add, xxx);
 *
 * Where 'xxx' is replaced by the address of a parameter struct to be
 * passed to the doamin_add() function.
 */

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

struct domainlist domains;

/*
 * 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.
 */
#define PR_NOTSUPP(pr, label)		\
	if (pr->pr_ ## label == NULL)	\
		pr->pr_ ## label = pr_generic_notsupp;

#define PRU_NOTSUPP(pu, label)		\
	if (pu->pru_ ## label == NULL)	\
		pu->pru_ ## label = pr_generic_notsupp;

static void
net_init_domain(struct domain *dp)
{
	struct protosw *pr;
	struct pr_usrreqs *pu;

	crit_enter();

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

	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
		pu = pr->pr_usrreqs;
		if (pu == NULL) {
			panic("domaininit: %ssw[%ld] has no usrreqs!",
			      dp->dom_name, (long)(pr - dp->dom_protosw));
		}
		PR_NOTSUPP(pr, ctloutput);
		PRU_NOTSUPP(pu, accept);
		PRU_NOTSUPP(pu, bind);
		PRU_NOTSUPP(pu, connect);
		PRU_NOTSUPP(pu, connect2);
		PRU_NOTSUPP(pu, control);
		PRU_NOTSUPP(pu, disconnect);
		PRU_NOTSUPP(pu, listen);
		PRU_NOTSUPP(pu, peeraddr);
		PRU_NOTSUPP(pu, rcvd);
		PRU_NOTSUPP(pu, rcvoob);
		PRU_NOTSUPP(pu, shutdown);
		PRU_NOTSUPP(pu, sockaddr);

		if (pu->pru_sense == NULL)
			pu->pru_sense = pru_sense_null;
		if (pu->pru_sosend == NULL)
			pu->pru_sosend = pru_sosend_notsupp;
		if (pu->pru_soreceive == NULL)
			pu->pru_soreceive = pru_soreceive_notsupp;

		if (pr->pr_init)
			(*pr->pr_init)();
	}
	/*
	 * update global information about maximums
	 */
	max_hdr = max_linkhdr + max_protohdr;
	max_datalen = MHLEN - max_hdr;
	crit_exit();
}

/*
 * 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 = data;

	crit_enter();
	SLIST_INSERT_HEAD(&domains, dp, dom_next);
	crit_exit();
	net_init_domain(dp);
}

/* ARGSUSED*/
static void
domaininit(void *dummy)
{
	if (max_linkhdr < 20)		/* XXX */
		max_linkhdr = 20;
}


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

	SLIST_FOREACH(dp, &domains, dom_next)
		if (dp->dom_family == family)
			goto found;
	return (NULL);

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

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

	if (family == 0)
		return (NULL);
	SLIST_FOREACH(dp, &domains, dom_next)
		if (dp->dom_family == family)
			goto found;
	return (NULL);

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 == NULL)
			maybe = pr;
	}
	return (maybe);
}

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

	SLIST_FOREACH(dp, &domains, dom_next) {
		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			so_pr_ctlinput(pr, cmd, sa, NULL);
	}
}

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

	SLIST_FOREACH(dp, &domains, dom_next) {
		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
			so_pr_ctlinput_direct(pr, cmd, sa, NULL);
	}
}

void
kpfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
{
	struct domain *dp;
	struct protosw *pr;

	if (!sa)
		return;
	SLIST_FOREACH(dp, &domains, 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++)
			so_pr_ctlinput(pr, cmd, sa, ctlparam);
	}
}