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/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/netdevice.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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static struct ax25_protocol *protocol_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static DEFINE_RWLOCK(protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static HLIST_HEAD(ax25_linkfail_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static DEFINE_SPINLOCK(linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static struct listen_struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct listen_struct *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	ax25_address  callsign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) } *listen_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static DEFINE_SPINLOCK(listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * AX25_P_IP or AX25_P_ARP ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) void ax25_register_pid(struct ax25_protocol *ap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	write_lock_bh(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	ap->next = protocol_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	protocol_list = ap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	write_unlock_bh(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) EXPORT_SYMBOL_GPL(ax25_register_pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) void ax25_protocol_release(unsigned int pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	struct ax25_protocol *protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	write_lock_bh(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	protocol = protocol_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	if (protocol == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (protocol->pid == pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		protocol_list = protocol->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	while (protocol != NULL && protocol->next != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (protocol->next->pid == pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			protocol->next = protocol->next->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		protocol = protocol->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	write_unlock_bh(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) EXPORT_SYMBOL(ax25_protocol_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) void ax25_linkfail_register(struct ax25_linkfail *lf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	spin_lock_bh(&linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	spin_unlock_bh(&linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) EXPORT_SYMBOL(ax25_linkfail_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) void ax25_linkfail_release(struct ax25_linkfail *lf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	spin_lock_bh(&linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	hlist_del_init(&lf->lf_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	spin_unlock_bh(&linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) EXPORT_SYMBOL(ax25_linkfail_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct listen_struct *listen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (ax25_listen_mine(callsign, dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	listen->callsign = *callsign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	listen->dev      = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	spin_lock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	listen->next = listen_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	listen_list  = listen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	return 0;
^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) EXPORT_SYMBOL(ax25_listen_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct listen_struct *s, *listen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	spin_lock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	listen = listen_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (listen == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		listen_list = listen->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		kfree(listen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	while (listen != NULL && listen->next != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			s = listen->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			listen->next = listen->next->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			kfree(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		listen = listen->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) EXPORT_SYMBOL(ax25_listen_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	int (*res)(struct sk_buff *, ax25_cb *) = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	struct ax25_protocol *protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	read_lock(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		if (protocol->pid == pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			res = protocol->func;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	read_unlock(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct listen_struct *listen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	spin_lock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	for (listen = listen_list; listen != NULL; listen = listen->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		if (ax25cmp(&listen->callsign, callsign) == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		    (listen->dev == dev || listen->dev == NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 			spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	spin_unlock_bh(&listen_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) void ax25_link_failed(ax25_cb *ax25, int reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	struct ax25_linkfail *lf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	spin_lock_bh(&linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	hlist_for_each_entry(lf, &ax25_linkfail_list, lf_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		lf->func(ax25, reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	spin_unlock_bh(&linkfail_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int ax25_protocol_is_registered(unsigned int pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct ax25_protocol *protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	int res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	read_lock_bh(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		if (protocol->pid == pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			res = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	read_unlock_bh(&protocol_list_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }