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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [ax25/] [ax25_iface.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl 
/*
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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 */
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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static struct ax25_protocol *protocol_list;
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static DEFINE_RWLOCK(protocol_list_lock);
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static HLIST_HEAD(ax25_linkfail_list);
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static DEFINE_SPINLOCK(linkfail_lock);
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static struct listen_struct {
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        struct listen_struct *next;
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        ax25_address  callsign;
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        struct net_device *dev;
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} *listen_list = NULL;
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static DEFINE_SPINLOCK(listen_lock);
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/*
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 * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
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 * AX25_P_IP or AX25_P_ARP ...
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 */
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void ax25_register_pid(struct ax25_protocol *ap)
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{
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        write_lock_bh(&protocol_list_lock);
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        ap->next = protocol_list;
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        protocol_list = ap;
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        write_unlock_bh(&protocol_list_lock);
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}
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EXPORT_SYMBOL_GPL(ax25_register_pid);
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void ax25_protocol_release(unsigned int pid)
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{
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        struct ax25_protocol *s, *protocol;
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        write_lock_bh(&protocol_list_lock);
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        protocol = protocol_list;
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        if (protocol == NULL) {
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                write_unlock_bh(&protocol_list_lock);
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                return;
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        }
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        if (protocol->pid == pid) {
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                protocol_list = protocol->next;
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                write_unlock_bh(&protocol_list_lock);
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                return;
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        }
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        while (protocol != NULL && protocol->next != NULL) {
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                if (protocol->next->pid == pid) {
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                        s = protocol->next;
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                        protocol->next = protocol->next->next;
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                        write_unlock_bh(&protocol_list_lock);
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                        return;
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                }
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                protocol = protocol->next;
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        }
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        write_unlock_bh(&protocol_list_lock);
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}
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EXPORT_SYMBOL(ax25_protocol_release);
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void ax25_linkfail_register(struct ax25_linkfail *lf)
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{
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        spin_lock_bh(&linkfail_lock);
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        hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
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        spin_unlock_bh(&linkfail_lock);
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}
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EXPORT_SYMBOL(ax25_linkfail_register);
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void ax25_linkfail_release(struct ax25_linkfail *lf)
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{
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        spin_lock_bh(&linkfail_lock);
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        hlist_del_init(&lf->lf_node);
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        spin_unlock_bh(&linkfail_lock);
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}
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EXPORT_SYMBOL(ax25_linkfail_release);
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int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
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{
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        struct listen_struct *listen;
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        if (ax25_listen_mine(callsign, dev))
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                return 0;
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        if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
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                return -ENOMEM;
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        listen->callsign = *callsign;
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        listen->dev      = dev;
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        spin_lock_bh(&listen_lock);
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        listen->next = listen_list;
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        listen_list  = listen;
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        spin_unlock_bh(&listen_lock);
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        return 0;
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}
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EXPORT_SYMBOL(ax25_listen_register);
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void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
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{
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        struct listen_struct *s, *listen;
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        spin_lock_bh(&listen_lock);
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        listen = listen_list;
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        if (listen == NULL) {
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                spin_unlock_bh(&listen_lock);
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                return;
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        }
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        if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
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                listen_list = listen->next;
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                spin_unlock_bh(&listen_lock);
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                kfree(listen);
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                return;
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        }
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        while (listen != NULL && listen->next != NULL) {
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                if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
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                        s = listen->next;
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                        listen->next = listen->next->next;
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                        spin_unlock_bh(&listen_lock);
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                        kfree(s);
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                        return;
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                }
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                listen = listen->next;
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        }
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        spin_unlock_bh(&listen_lock);
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}
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EXPORT_SYMBOL(ax25_listen_release);
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int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
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{
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        int (*res)(struct sk_buff *, ax25_cb *) = NULL;
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        struct ax25_protocol *protocol;
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        read_lock(&protocol_list_lock);
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        for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
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                if (protocol->pid == pid) {
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                        res = protocol->func;
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                        break;
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                }
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        read_unlock(&protocol_list_lock);
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        return res;
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}
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int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
182 
{
183 
        struct listen_struct *listen;
184 
 
185 
        spin_lock_bh(&listen_lock);
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        for (listen = listen_list; listen != NULL; listen = listen->next)
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                if (ax25cmp(&listen->callsign, callsign) == 0 &&
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                    (listen->dev == dev || listen->dev == NULL)) {
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                        spin_unlock_bh(&listen_lock);
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                        return 1;
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        }
192 
        spin_unlock_bh(&listen_lock);
193 
 
194 
        return 0;
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}
196 
 
197 
void ax25_link_failed(ax25_cb *ax25, int reason)
198 
{
199 
        struct ax25_linkfail *lf;
200 
        struct hlist_node *node;
201 
 
202 
        spin_lock_bh(&linkfail_lock);
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        hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node)
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                lf->func(ax25, reason);
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        spin_unlock_bh(&linkfail_lock);
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}
207 
 
208 
int ax25_protocol_is_registered(unsigned int pid)
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{
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        struct ax25_protocol *protocol;
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        int res = 0;
212 
 
213 
        read_lock_bh(&protocol_list_lock);
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        for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
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                if (protocol->pid == pid) {
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                        res = 1;
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                        break;
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                }
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        read_unlock_bh(&protocol_list_lock);
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        return res;
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}

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