common/io/sock_conf.c

0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * CDDL HEADER START
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * The contents of this file are subject to the terms of the
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Common Development and Distribution License (the "License").
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * You may not use this file except in compliance with the License.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * or http://www.opensolaris.org/os/licensing.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * See the License for the specific language governing permissions
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * and limitations under the License.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * When distributing Covered Code, include this CDDL HEADER in each
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * If applicable, add the following below this CDDL HEADER, with the
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * fields enclosed by brackets "[]" replaced with your own identifying
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * information: Portions Copyright [yyyy] [name of copyright owner]
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * CDDL HEADER END
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
3e95bd4ab92abca814bd28e854607d1975c7dc88Anders Persson * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/sysmacros.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/atomic.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/strsubr.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/socket.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/socketvar.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/cmn_err.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/modctl.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#include <sys/sdt.h>
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangninglist_t smod_list;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningkmutex_t smod_list_lock;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningso_create_func_t sock_comm_create_function;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningso_destroy_func_t sock_comm_destroy_function;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningstatic smod_info_t *smod_create(const char *);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningstatic void smod_destroy(smod_info_t *);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningextern void smod_add(smod_info_t *);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningvoid
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_init(void)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    list_create(&smod_list, sizeof (smod_info_t),
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        offsetof(smod_info_t, smod_node));
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_init(&smod_list_lock, NULL, MUTEX_DEFAULT, NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningstatic smod_info_t *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_find(const char *modname)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smod_info_t *smodp;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    ASSERT(MUTEX_HELD(&smod_list_lock));
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    for (smodp = list_head(&smod_list); smodp != NULL;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp = list_next(&smod_list, smodp))
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        if (strcmp(smodp->smod_name, modname) == 0)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            return (smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    return (NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Register the socket module.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningint
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_register(const smod_reg_t *reg)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smod_info_t *smodp;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    /*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * Make sure the socket module does not depend on capabilities
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * not available on the system.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    if (reg->smod_version != SOCKMOD_VERSION ||
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        reg->smod_dc_version != SOCK_DC_VERSION ||
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        reg->smod_uc_version != SOCK_UC_VERSION) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        cmn_err(CE_WARN,
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            "Failed to register socket module %s: version mismatch",
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            reg->smod_name);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        return (EINVAL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#ifdef DEBUG
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_enter(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    if ((smodp = smod_find(reg->smod_name)) != NULL) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        return (EEXIST);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#endif
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp = smod_create(reg->smod_name);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_version = reg->smod_version;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    if (strcmp(smodp->smod_name, SOTPI_SMOD_NAME) == 0 ||
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        strcmp(smodp->smod_name, "socksctp") == 0 ||
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        strcmp(smodp->smod_name, "socksdp") == 0) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        ASSERT(smodp->smod_proto_create_func == NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        ASSERT(reg->__smod_priv != NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_sock_create_func =
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            reg->__smod_priv->smodp_sock_create_func;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_sock_destroy_func =
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            reg->__smod_priv->smodp_sock_destroy_func;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_proto_create_func = NULL;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    } else {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        if (reg->smod_proto_create_func == NULL ||
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            (reg->__smod_priv != NULL &&
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            (reg->__smod_priv->smodp_sock_create_func != NULL ||
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            reg->__smod_priv->smodp_sock_destroy_func != NULL))) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#ifdef DEBUG
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            cmn_err(CE_CONT, "smod_register of %s failed",
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning                smodp->smod_name);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning#endif
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            smod_destroy(smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            return (EINVAL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_proto_create_func = reg->smod_proto_create_func;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_sock_create_func = sock_comm_create_function;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_sock_destroy_func = sock_comm_destroy_function;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_uc_version = reg->smod_uc_version;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        smodp->smod_dc_version = reg->smod_dc_version;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        if (reg->__smod_priv != NULL) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            smodp->smod_proto_fallback_func =
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning                reg->__smod_priv->smodp_proto_fallback_func;
3e95bd4ab92abca814bd28e854607d1975c7dc88Anders Persson            smodp->smod_fallback_devpath_v4 =
3e95bd4ab92abca814bd28e854607d1975c7dc88Anders Persson                reg->__smod_priv->smodp_fallback_devpath_v4;
3e95bd4ab92abca814bd28e854607d1975c7dc88Anders Persson            smodp->smod_fallback_devpath_v6 =
3e95bd4ab92abca814bd28e854607d1975c7dc88Anders Persson                reg->__smod_priv->smodp_fallback_devpath_v6;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smod_add(smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    return (0);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Unregister the socket module
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningint
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_unregister(const char *mod_name)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smod_info_t     *smodp;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_enter(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    if ((smodp = smod_find(mod_name)) != NULL) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        if (smodp->smod_refcnt != 0) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            return (EBUSY);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        } else {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            /*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning             * Delete the entry from the socket module list.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning             */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            list_remove(&smod_list, smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            smod_destroy(smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            return (0);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    return (ENXIO);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Initialize the socket module entry.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningstatic smod_info_t *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_create(const char *modname)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smod_info_t *smodp;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    int len;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp = kmem_zalloc(sizeof (*smodp), KM_SLEEP);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    len = strlen(modname) + 1;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_name = kmem_alloc(len, KM_SLEEP);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    bcopy(modname, smodp->smod_name, len);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_name[len - 1] = '\0';
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    return (smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Clean up the socket module part of the sockparams entry.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningstatic void
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_destroy(smod_info_t *smodp)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    ASSERT(smodp->smod_name != NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    ASSERT(smodp->smod_refcnt == 0);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    ASSERT(!list_link_active(&smodp->smod_node));
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    ASSERT(strcmp(smodp->smod_name, "socktpi") != 0);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    kmem_free(smodp->smod_name, strlen(smodp->smod_name) + 1);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_name = NULL;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_proto_create_func = NULL;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_sock_create_func = NULL;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smodp->smod_sock_destroy_func = NULL;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    kmem_free(smodp, sizeof (*smodp));
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Add an entry at the front of the socket module list.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningvoid
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_add(smod_info_t *smodp)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    ASSERT(smodp != NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_enter(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    list_insert_head(&smod_list, smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning/*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Lookup the socket module table by the socket module name.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * If there is an existing entry, then increase the reference count.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * Otherwise we load the module and in the module register function create
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning * a new entry and add it to the end of the socket module table.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_info_t *
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningsmod_lookup_byname(const char *modname)
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning{
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    smod_info_t *smodp;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    int error;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangningagain:
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    /*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * If find an entry, increase the reference count and
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * return the entry pointer.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_enter(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    if ((smodp = smod_find(modname)) != NULL) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        SMOD_INC_REF(smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        return (smodp);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    mutex_exit(&smod_list_lock);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    /*
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * We have a sockmod, and it is not loaded.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * Load the module into the kernel, modload() will
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     * take care of the multiple threads.
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning     */
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    DTRACE_PROBE1(load__socket__module, char *, modname);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    error = modload(SOCKMOD_PATH, modname);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    if (error == -1) {
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        cmn_err(CE_CONT, "modload of %s/%s failed",
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning            SOCKMOD_PATH, modname);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning        return (NULL);
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    }
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning    goto again;
0f1702c5201310f0529cd5abb77652e5e9b241b6Yu Xiangning}