diff options
Diffstat (limited to 'net/ax25/ax25_iface.c')
| -rw-r--r-- | net/ax25/ax25_iface.c | 266 |
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; +} |