1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi)
5 */
6 #include <linux/types.h>
7 #include <linux/slab.h>
8 #include <linux/socket.h>
9 #include <linux/timer.h>
10 #include <net/ax25.h>
11 #include <linux/skbuff.h>
12 #include <net/netrom.h>
13 #include <linux/init.h>
14
15 static void nr_loopback_timer(struct timer_list *);
16
17 static struct sk_buff_head loopback_queue;
18 static DEFINE_TIMER(loopback_timer, nr_loopback_timer);
19
20 void __init nr_loopback_init(void)
21 {
22 skb_queue_head_init(&loopback_queue);
23 }
24
25 static inline int nr_loopback_running(void)
26 {
27 return timer_pending(&loopback_timer);
28 }
29
30 int nr_loopback_queue(struct sk_buff *skb)
31 {
32 struct sk_buff *skbn;
33
34 if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
35 skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);
36 skb_reset_transport_header(skbn);
37
38 skb_queue_tail(&loopback_queue, skbn);
39
40 if (!nr_loopback_running())
41 mod_timer(&loopback_timer, jiffies + 10);
42 }
43
44 kfree_skb(skb);
45 return 1;
46 }
47
48 static void nr_loopback_timer(struct timer_list *unused)
49 {
50 struct sk_buff *skb;
51 ax25_address *nr_dest;
52 struct net_device *dev;
53
54 if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
55 nr_dest = (ax25_address *)(skb->data + 7);
56
57 dev = nr_dev_get(nr_dest);
58
59 if (dev == NULL || nr_rx_frame(skb, dev) == 0)
60 kfree_skb(skb);
61
62 dev_put(dev);
63
64 if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
65 mod_timer(&loopback_timer, jiffies + 10);
66 }
67 }
68
69 void nr_loopback_clear(void)
70 {
71 del_timer_sync(&loopback_timer);
72 skb_queue_purge(&loopback_queue);
73 }
74
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.