265 lines
6.6 KiB
C
265 lines
6.6 KiB
C
/*
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* net/tipc/user_reg.c: TIPC user registry code
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*
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* Copyright (c) 2000-2006, Ericsson AB
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* Copyright (c) 2004-2005, Wind River Systems
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* 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 are met:
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*
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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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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "user_reg.h"
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/*
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* TIPC user registry keeps track of users of the tipc_port interface.
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*
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* The registry utilizes an array of "TIPC user" entries;
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* a user's ID is the index of their associated array entry.
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* Array entry 0 is not used, so userid 0 is not valid;
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* TIPC sometimes uses this value to denote an anonymous user.
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* The list of free entries is initially chained from last entry to entry 1.
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*/
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/**
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* struct tipc_user - registered TIPC user info
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* @next: index of next free registry entry (or -1 for an allocated entry)
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* @callback: ptr to routine to call when TIPC mode changes (NULL if none)
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* @usr_handle: user-defined value passed to callback routine
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* @ports: list of user ports owned by the user
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*/
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struct tipc_user {
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int next;
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tipc_mode_event callback;
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void *usr_handle;
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struct list_head ports;
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};
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#define MAX_USERID 64
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#define USER_LIST_SIZE ((MAX_USERID + 1) * sizeof(struct tipc_user))
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static struct tipc_user *users = NULL;
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static u32 next_free_user = MAX_USERID + 1;
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static DEFINE_SPINLOCK(reg_lock);
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/**
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* reg_init - create TIPC user registry (but don't activate it)
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*
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* If registry has been pre-initialized it is left "as is".
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* NOTE: This routine may be called when TIPC is inactive.
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*/
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static int reg_init(void)
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{
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u32 i;
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spin_lock_bh(®_lock);
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if (!users) {
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users = kzalloc(USER_LIST_SIZE, GFP_ATOMIC);
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if (users) {
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for (i = 1; i <= MAX_USERID; i++) {
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users[i].next = i - 1;
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}
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next_free_user = MAX_USERID;
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}
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}
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spin_unlock_bh(®_lock);
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return users ? TIPC_OK : -ENOMEM;
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}
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/**
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* reg_callback - inform TIPC user about current operating mode
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*/
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static void reg_callback(struct tipc_user *user_ptr)
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{
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tipc_mode_event cb;
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void *arg;
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spin_lock_bh(®_lock);
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cb = user_ptr->callback;
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arg = user_ptr->usr_handle;
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spin_unlock_bh(®_lock);
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if (cb)
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cb(arg, tipc_mode, tipc_own_addr);
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}
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/**
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* tipc_reg_start - activate TIPC user registry
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*/
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int tipc_reg_start(void)
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{
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u32 u;
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int res;
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if ((res = reg_init()))
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return res;
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for (u = 1; u <= MAX_USERID; u++) {
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if (users[u].callback)
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tipc_k_signal((Handler)reg_callback,
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(unsigned long)&users[u]);
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}
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return TIPC_OK;
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}
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/**
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* tipc_reg_stop - shut down & delete TIPC user registry
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*/
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void tipc_reg_stop(void)
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{
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int id;
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if (!users)
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return;
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for (id = 1; id <= MAX_USERID; id++) {
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if (users[id].callback)
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reg_callback(&users[id]);
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}
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kfree(users);
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users = NULL;
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}
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/**
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* tipc_attach - register a TIPC user
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*
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* NOTE: This routine may be called when TIPC is inactive.
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*/
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int tipc_attach(u32 *userid, tipc_mode_event cb, void *usr_handle)
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{
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struct tipc_user *user_ptr;
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if ((tipc_mode == TIPC_NOT_RUNNING) && !cb)
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return -ENOPROTOOPT;
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if (!users)
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reg_init();
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spin_lock_bh(®_lock);
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if (!next_free_user) {
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spin_unlock_bh(®_lock);
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return -EBUSY;
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}
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user_ptr = &users[next_free_user];
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*userid = next_free_user;
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next_free_user = user_ptr->next;
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user_ptr->next = -1;
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spin_unlock_bh(®_lock);
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user_ptr->callback = cb;
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user_ptr->usr_handle = usr_handle;
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INIT_LIST_HEAD(&user_ptr->ports);
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atomic_inc(&tipc_user_count);
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if (cb && (tipc_mode != TIPC_NOT_RUNNING))
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tipc_k_signal((Handler)reg_callback, (unsigned long)user_ptr);
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return TIPC_OK;
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}
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/**
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* tipc_detach - deregister a TIPC user
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*/
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void tipc_detach(u32 userid)
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{
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struct tipc_user *user_ptr;
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struct list_head ports_temp;
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struct user_port *up_ptr, *temp_up_ptr;
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if ((userid == 0) || (userid > MAX_USERID))
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return;
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spin_lock_bh(®_lock);
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if ((!users) || (users[userid].next >= 0)) {
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spin_unlock_bh(®_lock);
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return;
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}
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user_ptr = &users[userid];
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user_ptr->callback = NULL;
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INIT_LIST_HEAD(&ports_temp);
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list_splice(&user_ptr->ports, &ports_temp);
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user_ptr->next = next_free_user;
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next_free_user = userid;
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spin_unlock_bh(®_lock);
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atomic_dec(&tipc_user_count);
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list_for_each_entry_safe(up_ptr, temp_up_ptr, &ports_temp, uport_list) {
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tipc_deleteport(up_ptr->ref);
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}
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}
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/**
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* tipc_reg_add_port - register a user's driver port
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*/
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int tipc_reg_add_port(struct user_port *up_ptr)
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{
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struct tipc_user *user_ptr;
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if (up_ptr->user_ref == 0)
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return TIPC_OK;
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if (up_ptr->user_ref > MAX_USERID)
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return -EINVAL;
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if ((tipc_mode == TIPC_NOT_RUNNING) || !users )
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return -ENOPROTOOPT;
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spin_lock_bh(®_lock);
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user_ptr = &users[up_ptr->user_ref];
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list_add(&up_ptr->uport_list, &user_ptr->ports);
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spin_unlock_bh(®_lock);
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return TIPC_OK;
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}
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/**
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* tipc_reg_remove_port - deregister a user's driver port
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*/
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int tipc_reg_remove_port(struct user_port *up_ptr)
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{
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if (up_ptr->user_ref == 0)
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return TIPC_OK;
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if (up_ptr->user_ref > MAX_USERID)
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return -EINVAL;
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if (!users )
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return -ENOPROTOOPT;
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spin_lock_bh(®_lock);
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list_del_init(&up_ptr->uport_list);
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spin_unlock_bh(®_lock);
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return TIPC_OK;
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}
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