inet/sockmods/sockmod_sctp.c

	sockmod_sctp.c revision 0f1702c5201310f0529cd5abb77652e5e9b241b6
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/sysmacros.h>
#include <sys/strsubr.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/modctl.h>
#include <sys/cmn_err.h>
#include <netinet/sctp.h>
#include <fs/sockfs/sockcommon.h>
#include "socksctp.h"

struct sonode   *socksctp_create(struct sockparams *, int, int, int,
                int, int, int *, cred_t *);
void        socksctp_destroy(struct sonode *);

static int  socksctp_constructor(void *, void *, int);
static void     socksctp_destructor(void *, void *);

static __smod_priv_t sosctp_priv = {
    socksctp_create,
    socksctp_destroy,
    NULL
};

static smod_reg_t sinfo = {
    SOCKMOD_VERSION,
    "socksctp",
    SOCK_UC_VERSION,
    SOCK_DC_VERSION,
    NULL,
    &sosctp_priv
};

kmem_cache_t *sosctp_assoccache;
static kmem_cache_t *sosctp_sockcache;

/*
 * Module linkage information for the kernel.
 */
static struct modlsockmod modlsockmod = {
    &mod_sockmodops, "SCTP socket module", &sinfo
};

static struct modlinkage modlinkage = {
    MODREV_1,
    &modlsockmod,
    NULL
};

static int
socksctp_init(void)
{
    sosctp_sockcache = kmem_cache_create("sctpsock",
        sizeof (struct sctp_sonode), 0, socksctp_constructor,
        socksctp_destructor, NULL, NULL, NULL, 0);
    sosctp_assoccache = kmem_cache_create("sctp_assoc",
        sizeof (struct sctp_soassoc), 0, NULL, NULL, NULL, NULL, NULL, 0);
    return (0);
}

static void
socksctp_fini(void)
{
    kmem_cache_destroy(sosctp_sockcache);
    kmem_cache_destroy(sosctp_assoccache);
}

/*ARGSUSED*/
static int
socksctp_constructor(void *buf, void *cdrarg, int kmflags)
{
    struct sctp_sonode *ss = buf;
    struct sonode *so = &ss->ss_so;

    ss->ss_type = SOSCTP_SOCKET;
    return (sonode_constructor((void *)so, cdrarg, kmflags));
}

/*ARGSUSED*/
static void
socksctp_destructor(void *buf, void *cdrarg)
{
    struct sctp_sonode *ss = buf;
    struct sonode *so = &ss->ss_so;

    sonode_destructor((void *)so, cdrarg);
}

/*
 * Creates a sctp socket data structure.
 */
/* ARGSUSED */
struct sonode *
socksctp_create(struct sockparams *sp, int family, int type, int protocol,
    int version, int sflags, int *errorp, cred_t *cr)
{
    struct sctp_sonode *ss;
    struct sonode *so;
    int kmflags = (sflags & SOCKET_NOSLEEP) ? KM_NOSLEEP : KM_SLEEP;

    if (version == SOV_STREAM) {
        *errorp = EINVAL;
        return (NULL);
    }

    /*
     * We only support two types of SCTP socket.  Let sotpi_create()
     * handle all other cases, such as raw socket.
     */
    if (!(family == AF_INET || family == AF_INET6) ||
        !(type == SOCK_STREAM || type == SOCK_SEQPACKET)) {
        *errorp = EINVAL;
        return (NULL);
    }

    ss = kmem_cache_alloc(sosctp_sockcache, kmflags);
    if (ss == NULL) {
        *errorp = ENOMEM;
        return (NULL);
    }

    so = &ss->ss_so;

    ss->ss_maxassoc = 0;
    ss->ss_assoccnt = 0;
    ss->ss_assocs   = NULL;

    if (type == SOCK_STREAM) {
        sonode_init(so, sp, family, type, protocol,
            &sosctp_sonodeops);
    } else {
        sonode_init(so, sp, family, type, protocol,
            &sosctp_seq_sonodeops);
        ASSERT(type == SOCK_SEQPACKET);
        mutex_enter(&so->so_lock);
        (void) sosctp_aid_grow(ss, 1, kmflags);
        mutex_exit(&so->so_lock);
    }

    if (version == SOV_DEFAULT) {
        version = so_default_version;
    }
    so->so_version = (short)version;

    dprint(2, ("sosctp_create: %p domain %d type %d\n", (void *)so, family,
        type));

    return (so);
}

/*
 * Free SCTP socket data structure.
 */
void
socksctp_destroy(struct sonode *so)
{
    struct sctp_sonode *ss;

    ASSERT((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
        so->so_protocol == IPPROTO_SCTP);

    sosctp_fini(so, CRED());

    ss = SOTOSSO(so);
    kmem_cache_free(sosctp_sockcache, ss);
}

int
_init(void)
{
    int error = 0;

    (void) socksctp_init();

    if ((error = mod_install(&modlinkage)) != 0)
        socksctp_fini();

    return (error);
}

int
_fini(void)
{
    int error = 0;

    if ((error = mod_remove(&modlinkage)) == 0)
        socksctp_fini();

    return (error);
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&modlinkage, modinfop));
}