1 files changed, 266 insertions, 0 deletions

diff --git a/net/ax25/ax25_iface.c b/net/ax25/ax25_iface.c
new file mode 100644
index 000000000000..d68aff100729
--- /dev/null
+++ b/net/ax25/ax25_iface.c
@@ -0,0 +1,266 @@
+/*
+ * This program 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.
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#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/spinlock.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 = NULL;
+static DEFINE_RWLOCK(protocol_list_lock);
+
+static struct linkfail_struct {
+        struct linkfail_struct *next;
+        void (*func)(ax25_cb *, int);
+} *linkfail_list = NULL;
+static DEFINE_SPINLOCK(linkfail_lock);
+
+static struct listen_struct {
+        struct listen_struct *next;
+        ax25_address  callsign;
+        struct net_device *dev;
+} *listen_list = NULL;
+static DEFINE_SPINLOCK(listen_lock);
+
+int ax25_protocol_register(unsigned int pid,
+        int (*func)(struct sk_buff *, ax25_cb *))
+{
+        struct protocol_struct *protocol;
+
+        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;
+
+        write_lock(&protocol_list_lock);
+        protocol->next = protocol_list;
+        protocol_list  = protocol;
+        write_unlock(&protocol_list_lock);
+
+        return 1;
+}
+
+void ax25_protocol_release(unsigned int pid)
+{
+        struct protocol_struct *s, *protocol;
+
+        write_lock(&protocol_list_lock);
+        protocol = protocol_list;
+        if (protocol == NULL) {
+                write_unlock(&protocol_list_lock);
+                return;
+        }
+
+        if (protocol->pid == pid) {
+                protocol_list = protocol->next;
+                write_unlock(&protocol_list_lock);
+                kfree(protocol);
+                return;
+        }
+
+        while (protocol != NULL && protocol->next != NULL) {
+                if (protocol->next->pid == pid) {
+                        s = protocol->next;
+                        protocol->next = protocol->next->next;
+                        write_unlock(&protocol_list_lock);
+                        kfree(s);
+                        return;
+                }
+
+                protocol = protocol->next;
+        }
+        write_unlock(&protocol_list_lock);
+}
+
+int ax25_linkfail_register(void (*func)(ax25_cb *, int))
+{
+        struct linkfail_struct *linkfail;
+
+        if ((linkfail = kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL)
+                return 0;
+
+        linkfail->func = func;
+
+        spin_lock_bh(&linkfail_lock);
+        linkfail->next = linkfail_list;
+        linkfail_list  = linkfail;
+        spin_unlock_bh(&linkfail_lock);
+
+        return 1;
+}
+
+void ax25_linkfail_release(void (*func)(ax25_cb *, int))
+{
+        struct linkfail_struct *s, *linkfail;
+
+        spin_lock_bh(&linkfail_lock);
+        linkfail = linkfail_list;
+        if (linkfail == NULL) {
+                spin_unlock_bh(&linkfail_lock);
+                return;
+        }
+
+        if (linkfail->func == func) {
+                linkfail_list = linkfail->next;
+                spin_unlock_bh(&linkfail_lock);
+                kfree(linkfail);
+                return;
+        }
+
+        while (linkfail != NULL && linkfail->next != NULL) {
+                if (linkfail->next->func == func) {
+                        s = linkfail->next;
+                        linkfail->next = linkfail->next->next;
+                        spin_unlock_bh(&linkfail_lock);
+                        kfree(s);
+                        return;
+                }
+
+                linkfail = linkfail->next;
+        }
+        spin_unlock_bh(&linkfail_lock);
+}
+
+int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
+{
+        struct listen_struct *listen;
+
+        if (ax25_listen_mine(callsign, dev))
+                return 0;
+
+        if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
+                return 0;
+
+        listen->callsign = *callsign;
+        listen->dev      = dev;
+
+        spin_lock_bh(&listen_lock);
+        listen->next = listen_list;
+        listen_list  = listen;
+        spin_unlock_bh(&listen_lock);
+
+        return 1;
+}
+
+void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
+{
+        struct listen_struct *s, *listen;
+
+        spin_lock_bh(&listen_lock);
+        listen = listen_list;
+        if (listen == NULL) {
+                spin_unlock_bh(&listen_lock);
+                return;
+        }
+
+        if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
+                listen_list = listen->next;
+                spin_unlock_bh(&listen_lock);
+                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;
+                        spin_unlock_bh(&listen_lock);
+                        kfree(s);
+                        return;
+                }
+
+                listen = listen->next;
+        }
+        spin_unlock_bh(&listen_lock);
+}
+
+int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
+{
+        int (*res)(struct sk_buff *, ax25_cb *) = NULL;
+        struct protocol_struct *protocol;
+
+        read_lock(&protocol_list_lock);
+        for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
+                if (protocol->pid == pid) {
+                        res = protocol->func;
+                        break;
+                }
+        read_unlock(&protocol_list_lock);
+
+        return res;
+}
+
+int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
+{
+        struct listen_struct *listen;
+
+        spin_lock_bh(&listen_lock);
+        for (listen = listen_list; listen != NULL; listen = listen->next)
+                if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev || listen->dev == NULL)) {
+                        spin_unlock_bh(&listen_lock);
+                        return 1;
+        }
+        spin_unlock_bh(&listen_lock);
+
+        return 0;
+}
+
+void ax25_link_failed(ax25_cb *ax25, int reason)
+{
+        struct linkfail_struct *linkfail;
+
+        spin_lock_bh(&linkfail_lock);
+        for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
+                (linkfail->func)(ax25, reason);
+        spin_unlock_bh(&linkfail_lock);
+}
+
+int ax25_protocol_is_registered(unsigned int pid)
+{
+        struct protocol_struct *protocol;
+        int res = 0;
+
+        read_lock(&protocol_list_lock);
+        for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
+                if (protocol->pid == pid) {
+                        res = 1;
+                        break;
+                }
+        read_unlock(&protocol_list_lock);
+
+        return res;
+}