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freebsd/sys/kern/uipc_domain.c

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/*-
* 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.
* 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("$FreeBSD$");
#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 void domainfinalize(void *);
SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
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 */
int domain_init_status = 0;
struct mtx dom_mtx; /* domain list lock */
MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
/*
* Dummy protocol specific user requests function pointer array.
* All functions return EOPNOTSUPP.
*/
struct pr_usrreqs nousrreqs = {
.pru_abort = pru_abort_notsupp,
.pru_accept = pru_accept_notsupp,
.pru_attach = pru_attach_notsupp,
.pru_bind = pru_bind_notsupp,
.pru_connect = pru_connect_notsupp,
.pru_connect2 = pru_connect2_notsupp,
.pru_control = pru_control_notsupp,
.pru_detach = pru_detach_notsupp,
.pru_disconnect = pru_disconnect_notsupp,
.pru_listen = pru_listen_notsupp,
.pru_peeraddr = pru_peeraddr_notsupp,
.pru_rcvd = pru_rcvd_notsupp,
.pru_rcvoob = pru_rcvoob_notsupp,
.pru_send = pru_send_notsupp,
.pru_sense = pru_sense_null,
.pru_shutdown = pru_shutdown_notsupp,
.pru_sockaddr = pru_sockaddr_notsupp,
.pru_sosend = pru_sosend_notsupp,
.pru_soreceive = pru_soreceive_notsupp,
.pru_sopoll = pru_sopoll_notsupp,
.pru_sosetlabel = pru_sosetlabel_null
};
static void
protosw_init(struct protosw *pr)
{
struct pr_usrreqs *pu;
pu = pr->pr_usrreqs;
KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
pr->pr_domain->dom_name,
(int)(pr - pr->pr_domain->dom_protosw)));
#define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
DEFAULT(pu->pru_accept, pru_accept_notsupp);
DEFAULT(pu->pru_connect, pru_connect_notsupp);
DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
DEFAULT(pu->pru_control, pru_control_notsupp);
DEFAULT(pu->pru_listen, pru_listen_notsupp);
DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
DEFAULT(pu->pru_sense, pru_sense_null);
DEFAULT(pu->pru_sosend, sosend);
DEFAULT(pu->pru_soreceive, soreceive);
DEFAULT(pu->pru_sopoll, sopoll);
DEFAULT(pu->pru_sosetlabel, pru_sosetlabel_null);
#undef DEFAULT
if (pr->pr_init)
(*pr->pr_init)();
}
/*
* 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++)
protosw_init(pr);
/*
* 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;
KASSERT(domain_init_status >= 1,
("attempt to net_add_domain(%s) before domaininit()",
dp->dom_name));
#ifndef INVARIANTS
if (domain_init_status < 1)
printf("WARNING: attempt to net_add_domain(%s) before "
"domaininit()\n", dp->dom_name);
#endif
#ifdef notyet
KASSERT(domain_init_status < 2,
("attempt to net_add_domain(%s) after domainfinalize()",
dp->dom_name));
#else
if (domain_init_status >= 2)
printf("WARNING: attempt to net_add_domain(%s) after "
"domainfinalize()\n", dp->dom_name);
#endif
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);
}
mtx_lock(&dom_mtx);
KASSERT(domain_init_status == 0, ("domaininit called too late!"));
domain_init_status = 1;
mtx_unlock(&dom_mtx);
}
/* ARGSUSED*/
static void
domainfinalize(void *dummy)
{
mtx_lock(&dom_mtx);
KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
domain_init_status = 2;
mtx_unlock(&dom_mtx);
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);
}
/*
* The caller must make sure that the new protocol is fully set up and ready to
* accept requests before it is registered.
*/
int
pf_proto_register(family, npr)
int family;
struct protosw *npr;
{
struct domain *dp;
struct protosw *pr, *fpr;
/* Sanity checks. */
if (family == 0)
return (EPFNOSUPPORT);
if (npr->pr_type == 0)
return (EPROTOTYPE);
if (npr->pr_protocol == 0)
return (EPROTONOSUPPORT);
if (npr->pr_usrreqs == NULL)
return (ENXIO);
/* Try to find the specified domain based on the family. */
for (dp = domains; dp; dp = dp->dom_next)
if (dp->dom_family == family)
goto found;
return (EPFNOSUPPORT);
found:
/* Initialize backpointer to struct domain. */
npr->pr_domain = dp;
fpr = NULL;
/*
* Protect us against races when two protocol registrations for
* the same protocol happen at the same time.
*/
mtx_lock(&Giant);
/* The new protocol must not yet exist. */
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
if ((pr->pr_type == npr->pr_type) &&
(pr->pr_protocol == npr->pr_protocol)) {
mtx_unlock(&Giant);
return (EEXIST); /* XXX: Check only protocol? */
}
/* While here, remember the first free spacer. */
if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
fpr = pr;
}
/* If no free spacer is found we can't add the new protocol. */
if (fpr == NULL) {
mtx_unlock(&Giant);
return (ENOMEM);
}
/* Copy the new struct protosw over the spacer. */
bcopy(npr, fpr, sizeof(*fpr));
/* Job is done, no more protection required. */
mtx_unlock(&Giant);
/* Initialize and activate the protocol. */
protosw_init(fpr);
return (0);
}
/*
* The caller must make sure the protocol and its functions correctly shut down
* all sockets and release all locks and memory references.
*/
int
pf_proto_unregister(family, protocol, type)
int family;
int protocol;
int type;
{
struct domain *dp;
struct protosw *pr, *dpr;
/* Sanity checks. */
if (family == 0)
return (EPFNOSUPPORT);
if (protocol == 0)
return (EPROTONOSUPPORT);
if (type == 0)
return (EPROTOTYPE);
/* Try to find the specified domain based on the family type. */
for (dp = domains; dp; dp = dp->dom_next)
if (dp->dom_family == family)
goto found;
return (EPFNOSUPPORT);
found:
dpr = NULL;
/* Lock out everyone else while we are manipulating the protosw. */
mtx_lock(&Giant);
/* The protocol must exist and only once. */
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
if (dpr != NULL) {
mtx_unlock(&Giant);
return (EMLINK); /* Should not happen! */
} else
dpr = pr;
}
}
/* Protocol does not exist. */
if (dpr == NULL) {
mtx_unlock(&Giant);
return (EPROTONOSUPPORT);
}
/* De-orbit the protocol and make the slot available again. */
dpr->pr_type = 0;
dpr->pr_domain = dp;
dpr->pr_protocol = PROTO_SPACER;
dpr->pr_flags = 0;
dpr->pr_input = NULL;
dpr->pr_output = NULL;
dpr->pr_ctlinput = NULL;
dpr->pr_ctloutput = NULL;
dpr->pr_ousrreq = NULL;
dpr->pr_init = NULL;
dpr->pr_fasttimo = NULL;
dpr->pr_slowtimo = NULL;
dpr->pr_drain = NULL;
dpr->pr_usrreqs = &nousrreqs;
/* Job is done, not more protection required. */
mtx_unlock(&Giant);
return (0);
}
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);
}
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