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214 lines
4.7 KiB
214 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright (C) Jonathan Naylor G4KLX ([email protected]) |
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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 <linux/slab.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 <linux/uaccess.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 *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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goto out; |
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if (protocol->pid == pid) { |
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protocol_list = protocol->next; |
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goto out; |
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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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protocol->next = protocol->next->next; |
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goto out; |
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} |
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protocol = protocol->next; |
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} |
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out: |
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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) |
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{ |
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struct listen_struct *listen; |
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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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} |
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spin_unlock_bh(&listen_lock); |
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return 0; |
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} |
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void ax25_link_failed(ax25_cb *ax25, int reason) |
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{ |
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struct ax25_linkfail *lf; |
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spin_lock_bh(&linkfail_lock); |
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hlist_for_each_entry(lf, &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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} |
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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; |
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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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