ax25_iface.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:5k
- /*
- * AX.25 release 037
- *
- * This code REQUIRES 2.1.15 or higher/ NET3.038
- *
- * This module:
- * This module is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * History
- * AX.25 036 Jonathan(G4KLX) Split from ax25_timer.c.
- */
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <net/ax25.h>
- #include <linux/inet.h>
- #include <linux/netdevice.h>
- #include <linux/skbuff.h>
- #include <net/sock.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <linux/fcntl.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- static struct protocol_struct {
- struct protocol_struct *next;
- unsigned int pid;
- int (*func)(struct sk_buff *, ax25_cb *);
- } *protocol_list;
- static struct linkfail_struct {
- struct linkfail_struct *next;
- void (*func)(ax25_cb *, int);
- } *linkfail_list;
- static struct listen_struct {
- struct listen_struct *next;
- ax25_address callsign;
- struct net_device *dev;
- } *listen_list;
- int ax25_protocol_register(unsigned int pid, int (*func)(struct sk_buff *, ax25_cb *))
- {
- struct protocol_struct *protocol;
- unsigned long flags;
- if (pid == AX25_P_TEXT || pid == AX25_P_SEGMENT)
- return 0;
- #ifdef CONFIG_INET
- if (pid == AX25_P_IP || pid == AX25_P_ARP)
- return 0;
- #endif
- if ((protocol = kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL)
- return 0;
- protocol->pid = pid;
- protocol->func = func;
- save_flags(flags);
- cli();
- protocol->next = protocol_list;
- protocol_list = protocol;
- restore_flags(flags);
- return 1;
- }
- void ax25_protocol_release(unsigned int pid)
- {
- struct protocol_struct *s, *protocol = protocol_list;
- unsigned long flags;
- if (protocol == NULL)
- return;
- save_flags(flags);
- cli();
- if (protocol->pid == pid) {
- protocol_list = protocol->next;
- restore_flags(flags);
- kfree(protocol);
- return;
- }
- while (protocol != NULL && protocol->next != NULL) {
- if (protocol->next->pid == pid) {
- s = protocol->next;
- protocol->next = protocol->next->next;
- restore_flags(flags);
- kfree(s);
- return;
- }
- protocol = protocol->next;
- }
- restore_flags(flags);
- }
- int ax25_linkfail_register(void (*func)(ax25_cb *, int))
- {
- struct linkfail_struct *linkfail;
- unsigned long flags;
- if ((linkfail = kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL)
- return 0;
- linkfail->func = func;
- save_flags(flags);
- cli();
- linkfail->next = linkfail_list;
- linkfail_list = linkfail;
- restore_flags(flags);
- return 1;
- }
- void ax25_linkfail_release(void (*func)(ax25_cb *, int))
- {
- struct linkfail_struct *s, *linkfail = linkfail_list;
- unsigned long flags;
- if (linkfail == NULL)
- return;
- save_flags(flags);
- cli();
- if (linkfail->func == func) {
- linkfail_list = linkfail->next;
- restore_flags(flags);
- kfree(linkfail);
- return;
- }
- while (linkfail != NULL && linkfail->next != NULL) {
- if (linkfail->next->func == func) {
- s = linkfail->next;
- linkfail->next = linkfail->next->next;
- restore_flags(flags);
- kfree(s);
- return;
- }
- linkfail = linkfail->next;
- }
- restore_flags(flags);
- }
- int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
- {
- struct listen_struct *listen;
- unsigned long flags;
- if (ax25_listen_mine(callsign, dev))
- return 0;
- if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
- return 0;
- listen->callsign = *callsign;
- listen->dev = dev;
- save_flags(flags);
- cli();
- listen->next = listen_list;
- listen_list = listen;
- restore_flags(flags);
- return 1;
- }
- void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
- {
- struct listen_struct *s, *listen = listen_list;
- unsigned long flags;
- if (listen == NULL)
- return;
- save_flags(flags);
- cli();
- if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
- listen_list = listen->next;
- restore_flags(flags);
- kfree(listen);
- return;
- }
- while (listen != NULL && listen->next != NULL) {
- if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
- s = listen->next;
- listen->next = listen->next->next;
- restore_flags(flags);
- kfree(s);
- return;
- }
- listen = listen->next;
- }
- restore_flags(flags);
- }
- int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
- {
- struct protocol_struct *protocol;
- for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
- if (protocol->pid == pid)
- return protocol->func;
- return NULL;
- }
- int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
- {
- struct listen_struct *listen;
- for (listen = listen_list; listen != NULL; listen = listen->next)
- if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev || listen->dev == NULL))
- return 1;
- return 0;
- }
- void ax25_link_failed(ax25_cb *ax25, int reason)
- {
- struct linkfail_struct *linkfail;
- for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
- (linkfail->func)(ax25, reason);
- }
- int ax25_protocol_is_registered(unsigned int pid)
- {
- struct protocol_struct *protocol;
- for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
- if (protocol->pid == pid)
- return 1;
- return 0;
- }