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 Tomi Manninen OH2BNS (oh2bns@sral.fi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/slab.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/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <net/netrom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static void nr_loopback_timer(struct timer_list *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static struct sk_buff_head loopback_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static DEFINE_TIMER(loopback_timer, nr_loopback_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) void __init nr_loopback_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	skb_queue_head_init(&loopback_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline int nr_loopback_running(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	return timer_pending(&loopback_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int nr_loopback_queue(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	struct sk_buff *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		skb_reset_transport_header(skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		skb_queue_tail(&loopback_queue, skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		if (!nr_loopback_running())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 			mod_timer(&loopback_timer, jiffies + 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static void nr_loopback_timer(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	ax25_address *nr_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		nr_dest = (ax25_address *)(skb->data + 7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		dev = nr_dev_get(nr_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		if (dev == NULL || nr_rx_frame(skb, dev) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		if (dev != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 			dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 			mod_timer(&loopback_timer, jiffies + 10);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) void nr_loopback_clear(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	del_timer_sync(&loopback_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	skb_queue_purge(&loopback_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }