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/*
* 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 (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include <sys/sysmacros.h>
#include <sys/atomic.h>
#include <sys/strsubr.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/cmn_err.h>
#include <sys/modctl.h>
#include <sys/sdt.h>
list_t smod_list;
kmutex_t smod_list_lock;
so_create_func_t sock_comm_create_function;
so_destroy_func_t sock_comm_destroy_function;
static smod_info_t *smod_create(const char *);
static void smod_destroy(smod_info_t *);
extern void smod_add(smod_info_t *);
void
smod_init(void)
{
list_create(&smod_list, sizeof (smod_info_t),
offsetof(smod_info_t, smod_node));
mutex_init(&smod_list_lock, NULL, MUTEX_DEFAULT, NULL);
}
static smod_info_t *
smod_find(const char *modname)
{
smod_info_t *smodp;
ASSERT(MUTEX_HELD(&smod_list_lock));
for (smodp = list_head(&smod_list); smodp != NULL;
smodp = list_next(&smod_list, smodp))
if (strcmp(smodp->smod_name, modname) == 0)
return (smodp);
return (NULL);
}
/*
* Register the socket module.
*/
int
smod_register(const smod_reg_t *reg)
{
smod_info_t *smodp;
/*
* Make sure the socket module does not depend on capabilities
* not available on the system.
*/
if (reg->smod_version != SOCKMOD_VERSION ||
reg->smod_dc_version != SOCK_DC_VERSION ||
reg->smod_uc_version != SOCK_UC_VERSION) {
cmn_err(CE_WARN,
"Failed to register socket module %s: version mismatch",
reg->smod_name);
return (EINVAL);
}
#ifdef DEBUG
mutex_enter(&smod_list_lock);
if ((smodp = smod_find(reg->smod_name)) != NULL) {
mutex_exit(&smod_list_lock);
return (EEXIST);
}
mutex_exit(&smod_list_lock);
#endif
smodp = smod_create(reg->smod_name);
smodp->smod_version = reg->smod_version;
if (strcmp(smodp->smod_name, SOTPI_SMOD_NAME) == 0 ||
strcmp(smodp->smod_name, "socksctp") == 0 ||
strcmp(smodp->smod_name, "socksdp") == 0) {
ASSERT(smodp->smod_proto_create_func == NULL);
ASSERT(reg->__smod_priv != NULL);
smodp->smod_sock_create_func =
reg->__smod_priv->smodp_sock_create_func;
smodp->smod_sock_destroy_func =
reg->__smod_priv->smodp_sock_destroy_func;
smodp->smod_proto_create_func = NULL;
} else {
if (reg->smod_proto_create_func == NULL ||
(reg->__smod_priv != NULL &&
(reg->__smod_priv->smodp_sock_create_func != NULL ||
reg->__smod_priv->smodp_sock_destroy_func != NULL))) {
#ifdef DEBUG
cmn_err(CE_CONT, "smod_register of %s failed",
smodp->smod_name);
#endif
smod_destroy(smodp);
return (EINVAL);
}
smodp->smod_proto_create_func = reg->smod_proto_create_func;
smodp->smod_sock_create_func = sock_comm_create_function;
smodp->smod_sock_destroy_func = sock_comm_destroy_function;
smodp->smod_uc_version = reg->smod_uc_version;
smodp->smod_dc_version = reg->smod_dc_version;
if (reg->__smod_priv != NULL) {
smodp->smod_proto_fallback_func =
reg->__smod_priv->smodp_proto_fallback_func;
smodp->smod_fallback_devpath_v4 =
reg->__smod_priv->smodp_fallback_devpath_v4;
smodp->smod_fallback_devpath_v6 =
reg->__smod_priv->smodp_fallback_devpath_v6;
}
}
smod_add(smodp);
return (0);
}
/*
* Unregister the socket module
*/
int
smod_unregister(const char *mod_name)
{
smod_info_t *smodp;
mutex_enter(&smod_list_lock);
if ((smodp = smod_find(mod_name)) != NULL) {
if (smodp->smod_refcnt != 0) {
mutex_exit(&smod_list_lock);
return (EBUSY);
} else {
/*
* Delete the entry from the socket module list.
*/
list_remove(&smod_list, smodp);
mutex_exit(&smod_list_lock);
smod_destroy(smodp);
return (0);
}
}
mutex_exit(&smod_list_lock);
return (ENXIO);
}
/*
* Initialize the socket module entry.
*/
static smod_info_t *
smod_create(const char *modname)
{
smod_info_t *smodp;
int len;
smodp = kmem_zalloc(sizeof (*smodp), KM_SLEEP);
len = strlen(modname) + 1;
smodp->smod_name = kmem_alloc(len, KM_SLEEP);
bcopy(modname, smodp->smod_name, len);
smodp->smod_name[len - 1] = '\0';
return (smodp);
}
/*
* Clean up the socket module part of the sockparams entry.
*/
static void
smod_destroy(smod_info_t *smodp)
{
ASSERT(smodp->smod_name != NULL);
ASSERT(smodp->smod_refcnt == 0);
ASSERT(!list_link_active(&smodp->smod_node));
ASSERT(strcmp(smodp->smod_name, "socktpi") != 0);
kmem_free(smodp->smod_name, strlen(smodp->smod_name) + 1);
smodp->smod_name = NULL;
smodp->smod_proto_create_func = NULL;
smodp->smod_sock_create_func = NULL;
smodp->smod_sock_destroy_func = NULL;
kmem_free(smodp, sizeof (*smodp));
}
/*
* Add an entry at the front of the socket module list.
*/
void
smod_add(smod_info_t *smodp)
{
ASSERT(smodp != NULL);
mutex_enter(&smod_list_lock);
list_insert_head(&smod_list, smodp);
mutex_exit(&smod_list_lock);
}
/*
* Lookup the socket module table by the socket module name.
* If there is an existing entry, then increase the reference count.
* Otherwise we load the module and in the module register function create
* a new entry and add it to the end of the socket module table.
*/
smod_info_t *
smod_lookup_byname(const char *modname)
{
smod_info_t *smodp;
int error;
again:
/*
* If find an entry, increase the reference count and
* return the entry pointer.
*/
mutex_enter(&smod_list_lock);
if ((smodp = smod_find(modname)) != NULL) {
SMOD_INC_REF(smodp);
mutex_exit(&smod_list_lock);
return (smodp);
}
mutex_exit(&smod_list_lock);
/*
* We have a sockmod, and it is not loaded.
* Load the module into the kernel, modload() will
* take care of the multiple threads.
*/
DTRACE_PROBE1(load__socket__module, char *, modname);
error = modload(SOCKMOD_PATH, modname);
if (error == -1) {
cmn_err(CE_CONT, "modload of %s/%s failed",
SOCKMOD_PATH, modname);
return (NULL);
}
goto again;
}
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