5908c617bb
return void, so don't implement no-op versions of these functions. Instead, consistently check if those switch pointers are NULL before invoking them.
500 lines
13 KiB
C
500 lines
13 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/eventhandler.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <vm/uma.h>
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/*
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* System initialization
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*
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* Note: domain initialization takes place on a per domain basis
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* as a result of traversing a SYSINIT linker set. Most likely,
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* each domain would want to call DOMAIN_SET(9) itself, which
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* would cause the domain to be added just after domaininit()
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* is called during startup.
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*
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* See DOMAIN_SET(9) for details on its use.
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*/
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static void domaininit(void *);
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SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL)
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static void domainfinalize(void *);
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SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
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NULL)
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static struct callout pffast_callout;
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static struct callout pfslow_callout;
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static void pffasttimo(void *);
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static void pfslowtimo(void *);
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struct domain *domains; /* registered protocol domains */
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int domain_init_status = 0;
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struct mtx dom_mtx; /* domain list lock */
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MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
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/*
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* Dummy protocol specific user requests function pointer array.
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* All functions return EOPNOTSUPP.
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*/
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struct pr_usrreqs nousrreqs = {
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.pru_accept = pru_accept_notsupp,
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.pru_attach = pru_attach_notsupp,
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.pru_bind = pru_bind_notsupp,
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.pru_connect = pru_connect_notsupp,
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.pru_connect2 = pru_connect2_notsupp,
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.pru_control = pru_control_notsupp,
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.pru_disconnect = pru_disconnect_notsupp,
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.pru_listen = pru_listen_notsupp,
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.pru_peeraddr = pru_peeraddr_notsupp,
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.pru_rcvd = pru_rcvd_notsupp,
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.pru_rcvoob = pru_rcvoob_notsupp,
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.pru_send = pru_send_notsupp,
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.pru_sense = pru_sense_null,
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.pru_shutdown = pru_shutdown_notsupp,
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.pru_sockaddr = pru_sockaddr_notsupp,
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.pru_sosend = pru_sosend_notsupp,
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.pru_soreceive = pru_soreceive_notsupp,
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.pru_sopoll = pru_sopoll_notsupp,
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};
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static void
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protosw_init(struct protosw *pr)
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{
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struct pr_usrreqs *pu;
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pu = pr->pr_usrreqs;
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KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
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pr->pr_domain->dom_name,
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(int)(pr - pr->pr_domain->dom_protosw)));
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#define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
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DEFAULT(pu->pru_accept, pru_accept_notsupp);
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DEFAULT(pu->pru_connect, pru_connect_notsupp);
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DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
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DEFAULT(pu->pru_control, pru_control_notsupp);
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DEFAULT(pu->pru_listen, pru_listen_notsupp);
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DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
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DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
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DEFAULT(pu->pru_sense, pru_sense_null);
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DEFAULT(pu->pru_sosend, sosend);
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DEFAULT(pu->pru_soreceive, soreceive);
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DEFAULT(pu->pru_sopoll, sopoll);
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#undef DEFAULT
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if (pr->pr_init)
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(*pr->pr_init)();
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}
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/*
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* Add a new protocol domain to the list of supported domains
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* Note: you cant unload it again because a socket may be using it.
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* XXX can't fail at this time.
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*/
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static void
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net_init_domain(struct domain *dp)
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{
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struct protosw *pr;
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if (dp->dom_init)
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(*dp->dom_init)();
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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protosw_init(pr);
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/*
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* update global information about maximums
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*/
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max_hdr = max_linkhdr + max_protohdr;
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max_datalen = MHLEN - max_hdr;
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if (max_datalen < 1)
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panic("%s: max_datalen < 1", __func__);
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}
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/*
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* Add a new protocol domain to the list of supported domains
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* Note: you cant unload it again because a socket may be using it.
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* XXX can't fail at this time.
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*/
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void
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net_add_domain(void *data)
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{
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struct domain *dp;
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dp = (struct domain *)data;
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mtx_lock(&dom_mtx);
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dp->dom_next = domains;
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domains = dp;
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KASSERT(domain_init_status >= 1,
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("attempt to net_add_domain(%s) before domaininit()",
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dp->dom_name));
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#ifndef INVARIANTS
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if (domain_init_status < 1)
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printf("WARNING: attempt to net_add_domain(%s) before "
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"domaininit()\n", dp->dom_name);
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#endif
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#ifdef notyet
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KASSERT(domain_init_status < 2,
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("attempt to net_add_domain(%s) after domainfinalize()",
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dp->dom_name));
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#else
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if (domain_init_status >= 2)
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printf("WARNING: attempt to net_add_domain(%s) after "
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"domainfinalize()\n", dp->dom_name);
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#endif
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mtx_unlock(&dom_mtx);
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net_init_domain(dp);
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}
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static void
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socket_zone_change(void *tag)
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{
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uma_zone_set_max(socket_zone, maxsockets);
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}
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/* ARGSUSED*/
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static void
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domaininit(void *dummy)
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{
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/*
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* Before we do any setup, make sure to initialize the
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* zone allocator we get struct sockets from.
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*/
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socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
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NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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uma_zone_set_max(socket_zone, maxsockets);
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EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL,
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EVENTHANDLER_PRI_FIRST);
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if (max_linkhdr < 16) /* XXX */
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max_linkhdr = 16;
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if (debug_mpsafenet) {
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callout_init(&pffast_callout, CALLOUT_MPSAFE);
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callout_init(&pfslow_callout, CALLOUT_MPSAFE);
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} else {
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callout_init(&pffast_callout, 0);
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callout_init(&pfslow_callout, 0);
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}
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mtx_lock(&dom_mtx);
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KASSERT(domain_init_status == 0, ("domaininit called too late!"));
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domain_init_status = 1;
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mtx_unlock(&dom_mtx);
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}
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/* ARGSUSED*/
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static void
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domainfinalize(void *dummy)
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{
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mtx_lock(&dom_mtx);
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KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
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domain_init_status = 2;
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mtx_unlock(&dom_mtx);
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callout_reset(&pffast_callout, 1, pffasttimo, NULL);
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callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
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}
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struct protosw *
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pffindtype(family, type)
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int family;
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int type;
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{
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register struct domain *dp;
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register struct protosw *pr;
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for (dp = domains; dp; dp = dp->dom_next)
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if (dp->dom_family == family)
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goto found;
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return (0);
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found:
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_type && pr->pr_type == type)
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return (pr);
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return (0);
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}
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struct protosw *
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pffindproto(family, protocol, type)
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int family;
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int protocol;
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int type;
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{
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register struct domain *dp;
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register struct protosw *pr;
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struct protosw *maybe = 0;
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if (family == 0)
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return (0);
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for (dp = domains; dp; dp = dp->dom_next)
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if (dp->dom_family == family)
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goto found;
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return (0);
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found:
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
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if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
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return (pr);
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if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
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pr->pr_protocol == 0 && maybe == (struct protosw *)0)
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maybe = pr;
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}
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return (maybe);
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}
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/*
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* The caller must make sure that the new protocol is fully set up and ready to
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* accept requests before it is registered.
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*/
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int
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pf_proto_register(family, npr)
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int family;
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struct protosw *npr;
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{
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struct domain *dp;
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struct protosw *pr, *fpr;
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/* Sanity checks. */
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if (family == 0)
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return (EPFNOSUPPORT);
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if (npr->pr_type == 0)
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return (EPROTOTYPE);
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if (npr->pr_protocol == 0)
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return (EPROTONOSUPPORT);
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if (npr->pr_usrreqs == NULL)
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return (ENXIO);
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/* Try to find the specified domain based on the family. */
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for (dp = domains; dp; dp = dp->dom_next)
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if (dp->dom_family == family)
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goto found;
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return (EPFNOSUPPORT);
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found:
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/* Initialize backpointer to struct domain. */
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npr->pr_domain = dp;
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fpr = NULL;
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/*
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* Protect us against races when two protocol registrations for
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* the same protocol happen at the same time.
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*/
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mtx_lock(&Giant);
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/* The new protocol must not yet exist. */
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
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if ((pr->pr_type == npr->pr_type) &&
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(pr->pr_protocol == npr->pr_protocol)) {
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mtx_unlock(&Giant);
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return (EEXIST); /* XXX: Check only protocol? */
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}
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/* While here, remember the first free spacer. */
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if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
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fpr = pr;
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}
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/* If no free spacer is found we can't add the new protocol. */
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if (fpr == NULL) {
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mtx_unlock(&Giant);
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return (ENOMEM);
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}
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/* Copy the new struct protosw over the spacer. */
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bcopy(npr, fpr, sizeof(*fpr));
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/* Job is done, no more protection required. */
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mtx_unlock(&Giant);
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/* Initialize and activate the protocol. */
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protosw_init(fpr);
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return (0);
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}
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/*
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* The caller must make sure the protocol and its functions correctly shut down
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* all sockets and release all locks and memory references.
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*/
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int
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pf_proto_unregister(family, protocol, type)
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int family;
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int protocol;
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int type;
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{
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struct domain *dp;
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struct protosw *pr, *dpr;
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/* Sanity checks. */
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if (family == 0)
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return (EPFNOSUPPORT);
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if (protocol == 0)
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return (EPROTONOSUPPORT);
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if (type == 0)
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return (EPROTOTYPE);
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/* Try to find the specified domain based on the family type. */
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for (dp = domains; dp; dp = dp->dom_next)
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if (dp->dom_family == family)
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goto found;
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return (EPFNOSUPPORT);
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found:
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dpr = NULL;
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/* Lock out everyone else while we are manipulating the protosw. */
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mtx_lock(&Giant);
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/* The protocol must exist and only once. */
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
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if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
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if (dpr != NULL) {
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mtx_unlock(&Giant);
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return (EMLINK); /* Should not happen! */
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} else
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dpr = pr;
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}
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}
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/* Protocol does not exist. */
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if (dpr == NULL) {
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mtx_unlock(&Giant);
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return (EPROTONOSUPPORT);
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}
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/* De-orbit the protocol and make the slot available again. */
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dpr->pr_type = 0;
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dpr->pr_domain = dp;
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dpr->pr_protocol = PROTO_SPACER;
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dpr->pr_flags = 0;
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dpr->pr_input = NULL;
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dpr->pr_output = NULL;
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dpr->pr_ctlinput = NULL;
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dpr->pr_ctloutput = NULL;
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dpr->pr_ousrreq = NULL;
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dpr->pr_init = NULL;
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dpr->pr_fasttimo = NULL;
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dpr->pr_slowtimo = NULL;
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dpr->pr_drain = NULL;
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dpr->pr_usrreqs = &nousrreqs;
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/* Job is done, not more protection required. */
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mtx_unlock(&Giant);
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return (0);
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}
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void
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pfctlinput(cmd, sa)
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int cmd;
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struct sockaddr *sa;
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{
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register struct domain *dp;
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register struct protosw *pr;
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for (dp = domains; dp; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_ctlinput)
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(*pr->pr_ctlinput)(cmd, sa, (void *)0);
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}
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void
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pfctlinput2(cmd, sa, ctlparam)
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int cmd;
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struct sockaddr *sa;
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void *ctlparam;
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{
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struct domain *dp;
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struct protosw *pr;
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if (!sa)
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return;
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for (dp = domains; dp; dp = dp->dom_next) {
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/*
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* the check must be made by xx_ctlinput() anyways, to
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* make sure we use data item pointed to by ctlparam in
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* correct way. the following check is made just for safety.
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*/
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if (dp->dom_family != sa->sa_family)
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continue;
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_ctlinput)
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(*pr->pr_ctlinput)(cmd, sa, ctlparam);
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}
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}
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static void
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pfslowtimo(arg)
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void *arg;
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{
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register struct domain *dp;
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register struct protosw *pr;
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NET_ASSERT_GIANT();
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for (dp = domains; dp; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_slowtimo)
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(*pr->pr_slowtimo)();
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callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL);
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}
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static void
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pffasttimo(arg)
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void *arg;
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{
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register struct domain *dp;
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register struct protosw *pr;
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NET_ASSERT_GIANT();
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for (dp = domains; dp; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_fasttimo)
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(*pr->pr_fasttimo)();
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callout_reset(&pffast_callout, hz/5, pffasttimo, NULL);
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}
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