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Diffstat (limited to 'net/ax25/ax25_iface.c')
-rw-r--r--net/ax25/ax25_iface.c266
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 00000000000..d68aff10072
--- /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;
+}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-26 19:50:57 +0000