/*
 * 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);
        }
}