Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) ax25_dev *ax25_dev_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) DEFINE_SPINLOCK(ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	ax25_dev *ax25_dev, *res = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	spin_lock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			res = ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	spin_unlock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  *	This is called when an interface is brought up. These are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  *	reasonable defaults.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) void ax25_dev_device_up(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	ax25_dev *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	dev->ax25_ptr     = ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	ax25_dev->dev     = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	dev_hold(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	ax25_dev->forward = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	ax25_dev->values[AX25_VALUES_BACKOFF]   = AX25_DEF_BACKOFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ax25_dev->values[AX25_VALUES_CONMODE]   = AX25_DEF_CONMODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	ax25_dev->values[AX25_VALUES_WINDOW]    = AX25_DEF_WINDOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	ax25_dev->values[AX25_VALUES_EWINDOW]   = AX25_DEF_EWINDOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ax25_dev->values[AX25_VALUES_T1]        = AX25_DEF_T1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	ax25_dev->values[AX25_VALUES_T2]        = AX25_DEF_T2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	ax25_dev->values[AX25_VALUES_T3]        = AX25_DEF_T3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	ax25_dev->values[AX25_VALUES_IDLE]	= AX25_DEF_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	ax25_dev->values[AX25_VALUES_N2]        = AX25_DEF_N2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	ax25_dev->values[AX25_VALUES_PACLEN]	= AX25_DEF_PACLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	ax25_dev->values[AX25_VALUES_PROTOCOL]  = AX25_DEF_PROTOCOL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	ax25_ds_setup_timer(ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	spin_lock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	ax25_dev->next = ax25_dev_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	ax25_dev_list  = ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	spin_unlock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	ax25_register_dev_sysctl(ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) void ax25_dev_device_down(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	ax25_dev *s, *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	ax25_unregister_dev_sysctl(ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	spin_lock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #ifdef CONFIG_AX25_DAMA_SLAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	ax25_ds_del_timer(ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 *	Remove any packet forwarding that points to this device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	for (s = ax25_dev_list; s != NULL; s = s->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		if (s->forward == dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			s->forward = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if ((s = ax25_dev_list) == ax25_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		ax25_dev_list = s->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		spin_unlock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		dev->ax25_ptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		kfree(ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	while (s != NULL && s->next != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		if (s->next == ax25_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			s->next = ax25_dev->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			spin_unlock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			dev->ax25_ptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			kfree(ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		s = s->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	spin_unlock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	dev->ax25_ptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	ax25_dev *ax25_dev, *fwd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	case SIOCAX25ADDFWD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (ax25_dev->forward != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		ax25_dev->forward = fwd_dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case SIOCAX25DELFWD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		if (ax25_dev->forward == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		ax25_dev->forward = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct net_device *ax25_fwd_dev(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	ax25_dev *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (ax25_dev->forward == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		return dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return ax25_dev->forward;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  *	Free all memory associated with device structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) void __exit ax25_dev_free(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	ax25_dev *s, *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	spin_lock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	ax25_dev = ax25_dev_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	while (ax25_dev != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		s        = ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		dev_put(ax25_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		ax25_dev = ax25_dev->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		kfree(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	ax25_dev_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	spin_unlock_bh(&ax25_dev_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }