| // 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/slab.h> |
| #include <linux/in.h> |
| #include <linux/kernel.h> |
| #include <linux/timer.h> |
| #include <linux/string.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/spinlock.h> |
| #include <net/ax25.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.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> |
| #include <linux/init.h> |
| |
| ax25_dev *ax25_dev_list; |
| DEFINE_SPINLOCK(ax25_dev_lock); |
| |
| ax25_dev *ax25_addr_ax25dev(ax25_address *addr) |
| { |
| ax25_dev *ax25_dev, *res = NULL; |
| |
| spin_lock_bh(&ax25_dev_lock); |
| for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) |
| if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) { |
| res = ax25_dev; |
| ax25_dev_hold(ax25_dev); |
| } |
| spin_unlock_bh(&ax25_dev_lock); |
| |
| return res; |
| } |
| |
| /* |
| * This is called when an interface is brought up. These are |
| * reasonable defaults. |
| */ |
| void ax25_dev_device_up(struct net_device *dev) |
| { |
| ax25_dev *ax25_dev; |
| |
| if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) { |
| printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n"); |
| return; |
| } |
| |
| refcount_set(&ax25_dev->refcount, 1); |
| dev->ax25_ptr = ax25_dev; |
| ax25_dev->dev = dev; |
| dev_hold(dev); |
| ax25_dev->forward = NULL; |
| |
| ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE; |
| ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE; |
| ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF; |
| ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE; |
| ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW; |
| ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW; |
| ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1; |
| ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2; |
| ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3; |
| ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE; |
| ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; |
| ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; |
| ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; |
| ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; |
| |
| #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) |
| ax25_ds_setup_timer(ax25_dev); |
| #endif |
| |
| spin_lock_bh(&ax25_dev_lock); |
| ax25_dev->next = ax25_dev_list; |
| ax25_dev_list = ax25_dev; |
| spin_unlock_bh(&ax25_dev_lock); |
| ax25_dev_hold(ax25_dev); |
| |
| ax25_register_dev_sysctl(ax25_dev); |
| } |
| |
| void ax25_dev_device_down(struct net_device *dev) |
| { |
| ax25_dev *s, *ax25_dev; |
| |
| if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) |
| return; |
| |
| ax25_unregister_dev_sysctl(ax25_dev); |
| |
| spin_lock_bh(&ax25_dev_lock); |
| |
| #ifdef CONFIG_AX25_DAMA_SLAVE |
| ax25_ds_del_timer(ax25_dev); |
| #endif |
| |
| /* |
| * Remove any packet forwarding that points to this device. |
| */ |
| for (s = ax25_dev_list; s != NULL; s = s->next) |
| if (s->forward == dev) |
| s->forward = NULL; |
| |
| if ((s = ax25_dev_list) == ax25_dev) { |
| ax25_dev_list = s->next; |
| spin_unlock_bh(&ax25_dev_lock); |
| ax25_dev_put(ax25_dev); |
| dev->ax25_ptr = NULL; |
| dev_put(dev); |
| ax25_dev_put(ax25_dev); |
| return; |
| } |
| |
| while (s != NULL && s->next != NULL) { |
| if (s->next == ax25_dev) { |
| s->next = ax25_dev->next; |
| spin_unlock_bh(&ax25_dev_lock); |
| ax25_dev_put(ax25_dev); |
| dev->ax25_ptr = NULL; |
| dev_put(dev); |
| ax25_dev_put(ax25_dev); |
| return; |
| } |
| |
| s = s->next; |
| } |
| spin_unlock_bh(&ax25_dev_lock); |
| dev->ax25_ptr = NULL; |
| ax25_dev_put(ax25_dev); |
| } |
| |
| int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd) |
| { |
| ax25_dev *ax25_dev, *fwd_dev; |
| |
| if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL) |
| return -EINVAL; |
| |
| switch (cmd) { |
| case SIOCAX25ADDFWD: |
| fwd_dev = ax25_addr_ax25dev(&fwd->port_to); |
| if (!fwd_dev) { |
| ax25_dev_put(ax25_dev); |
| return -EINVAL; |
| } |
| if (ax25_dev->forward) { |
| ax25_dev_put(fwd_dev); |
| ax25_dev_put(ax25_dev); |
| return -EINVAL; |
| } |
| ax25_dev->forward = fwd_dev->dev; |
| ax25_dev_put(fwd_dev); |
| ax25_dev_put(ax25_dev); |
| break; |
| |
| case SIOCAX25DELFWD: |
| if (!ax25_dev->forward) { |
| ax25_dev_put(ax25_dev); |
| return -EINVAL; |
| } |
| ax25_dev->forward = NULL; |
| ax25_dev_put(ax25_dev); |
| break; |
| |
| default: |
| ax25_dev_put(ax25_dev); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| struct net_device *ax25_fwd_dev(struct net_device *dev) |
| { |
| ax25_dev *ax25_dev; |
| |
| if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) |
| return dev; |
| |
| if (ax25_dev->forward == NULL) |
| return dev; |
| |
| return ax25_dev->forward; |
| } |
| |
| /* |
| * Free all memory associated with device structures. |
| */ |
| void __exit ax25_dev_free(void) |
| { |
| ax25_dev *s, *ax25_dev; |
| |
| spin_lock_bh(&ax25_dev_lock); |
| ax25_dev = ax25_dev_list; |
| while (ax25_dev != NULL) { |
| s = ax25_dev; |
| dev_put(ax25_dev->dev); |
| ax25_dev = ax25_dev->next; |
| kfree(s); |
| } |
| ax25_dev_list = NULL; |
| spin_unlock_bh(&ax25_dev_lock); |
| } |