diff options
Diffstat (limited to 'net/ax25/ax25_iface.c')
| -rw-r--r-- | net/ax25/ax25_iface.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/net/ax25/ax25_iface.c b/net/ax25/ax25_iface.c new file mode 100644 index 000000000..b4083f30a --- /dev/null +++ b/net/ax25/ax25_iface.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + */ +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/sockios.h> +#include <linux/net.h> +#include <linux/slab.h> +#include <net/ax25.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <linux/uaccess.h> +#include <linux/fcntl.h> +#include <linux/mm.h> +#include <linux/interrupt.h> + +static struct ax25_protocol *protocol_list; +static DEFINE_RWLOCK(protocol_list_lock); + +static HLIST_HEAD(ax25_linkfail_list); +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); + +/* + * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT, + * AX25_P_IP or AX25_P_ARP ... + */ +void ax25_register_pid(struct ax25_protocol *ap) +{ + write_lock_bh(&protocol_list_lock); + ap->next = protocol_list; + protocol_list = ap; + write_unlock_bh(&protocol_list_lock); +} + +EXPORT_SYMBOL_GPL(ax25_register_pid); + +void ax25_protocol_release(unsigned int pid) +{ + struct ax25_protocol *protocol; + + write_lock_bh(&protocol_list_lock); + protocol = protocol_list; + if (protocol == NULL) + goto out; + + if (protocol->pid == pid) { + protocol_list = protocol->next; + goto out; + } + + while (protocol != NULL && protocol->next != NULL) { + if (protocol->next->pid == pid) { + protocol->next = protocol->next->next; + goto out; + } + + protocol = protocol->next; + } +out: + write_unlock_bh(&protocol_list_lock); +} + +EXPORT_SYMBOL(ax25_protocol_release); + +void ax25_linkfail_register(struct ax25_linkfail *lf) +{ + spin_lock_bh(&linkfail_lock); + hlist_add_head(&lf->lf_node, &ax25_linkfail_list); + spin_unlock_bh(&linkfail_lock); +} + +EXPORT_SYMBOL(ax25_linkfail_register); + +void ax25_linkfail_release(struct ax25_linkfail *lf) +{ + spin_lock_bh(&linkfail_lock); + hlist_del_init(&lf->lf_node); + spin_unlock_bh(&linkfail_lock); +} + +EXPORT_SYMBOL(ax25_linkfail_release); + +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 -ENOMEM; + + listen->callsign = *callsign; + listen->dev = dev; + + spin_lock_bh(&listen_lock); + listen->next = listen_list; + listen_list = listen; + spin_unlock_bh(&listen_lock); + + return 0; +} + +EXPORT_SYMBOL(ax25_listen_register); + +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); +} + +EXPORT_SYMBOL(ax25_listen_release); + +int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *) +{ + int (*res)(struct sk_buff *, ax25_cb *) = NULL; + struct ax25_protocol *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 ax25_linkfail *lf; + + spin_lock_bh(&linkfail_lock); + hlist_for_each_entry(lf, &ax25_linkfail_list, lf_node) + lf->func(ax25, reason); + spin_unlock_bh(&linkfail_lock); +} + +int ax25_protocol_is_registered(unsigned int pid) +{ + struct ax25_protocol *protocol; + int res = 0; + + read_lock_bh(&protocol_list_lock); + for (protocol = protocol_list; protocol != NULL; protocol = protocol->next) + if (protocol->pid == pid) { + res = 1; + break; + } + read_unlock_bh(&protocol_list_lock); + + return res; +} |