uipc_domain.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/*
 * 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/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/proc.h>
#include <vm/vm.h>
#include <sys/sysctl.h>

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

struct domain *domains;

#define	ADDDOMAIN(x)	{ \
	extern struct domain __CONCAT(x,domain); \
	__CONCAT(x,domain.dom_next) = domains; \
	domains = &__CONCAT(x,domain); \
}

extern struct linker_set domain_set;

void
domaininit()
{
	register struct domain *dp, **dpp;
	register struct protosw *pr;

	//printf("domaininit starting\n");

	/*
	 * NB - local domain is always present.
	 */
	ADDDOMAIN(local);
	ADDDOMAIN(inet);

	for (dpp = (struct domain **)domain_set.ls_items; *dpp; dpp++) {
	    //printf("(1) Domain %s counting\n", (**dpp).dom_name);
	    (**dpp).dom_next = domains;
	    domains = *dpp;
	}

/* - not in our sources
#ifdef ISDN
	ADDDOMAIN(isdn);
#endif
*/
	for (dp = domains; dp; dp = dp->dom_next) {
	    //printf("(1) Domain %s initializing\n", dp->dom_name);
	    if (dp->dom_init)
		(*dp->dom_init)();
	    for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
		//printf("Registering protocols for %s\n", dp->dom_name);
		if (pr->pr_init)
		    (*pr->pr_init)();
	    }
	    if( dp->dom_next && !dp->dom_next->dom_name )
		dp->dom_next = 0;
	}

	if (max_linkhdr < 16)		/* XXX */
		max_linkhdr = 16;
	max_hdr = max_linkhdr + max_protohdr;
	max_datalen = MHLEN - max_hdr;
	timeout(pffasttimo, (void *)0, 1);
	timeout(pfslowtimo, (void *)0, 1);

	//printf("Domaininit done\n");
}

struct protosw *
pffindtype(family, type)
	int family, 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, protocol, 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);
}

int
net_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
	int *name;
	u_int namelen;
	void *oldp;
	size_t *oldlenp;
	void *newp;
	size_t newlen;
	struct proc *p;
{
	register struct domain *dp;
	register struct protosw *pr;
	int family, protocol;

	/*
	 * All sysctl names at this level are nonterminal;
	 * next two components are protocol family and protocol number,
	 * then at least one addition component.
	 */
	if (namelen < 3)
		return (EISDIR);		/* overloaded */
	family = name[0];
	protocol = name[1];

	if (family == 0)
		return (0);
	for (dp = domains; dp; dp = dp->dom_next)
		if (dp->dom_family == family)
			goto found;
	return (ENOPROTOOPT);
found:
	for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
		if (pr->pr_protocol == protocol && pr->pr_sysctl)
			return ((*pr->pr_sysctl)(name + 2, namelen - 2,
			    oldp, oldlenp, newp, newlen));
	return (ENOPROTOOPT);
}

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, (caddr_t)0);
}

void
pfslowtimo(arg)
	void *arg;
{
	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_slowtimo)
				(*pr->pr_slowtimo)();
	timeout(pfslowtimo, (void *)0, hz/2);
}

void
pffasttimo(arg)
	void *arg;
{
	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_fasttimo)
				(*pr->pr_fasttimo)();
	timeout(pffasttimo, (void *)0, hz/5);
}