1 /*
2 * NET/ROM release 007
3 *
4 * This code REQUIRES 2.1.15 or higher/ NET3.038
5 *
6 * This module:
7 * This module is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * History
13 * NET/ROM 007 Tomi(OH2BNS) Created this file.
14 * Small change in nr_loopback_queue().
15 *
16 */
17
18 #include <linux/types.h>
19 #include <linux/socket.h>
20 #include <linux/timer.h>
21 #include <net/ax25.h>
22 #include <linux/skbuff.h>
23 #include <net/netrom.h>
24 #include <linux/init.h>
25
26 static struct sk_buff_head loopback_queue;
27 static struct timer_list loopback_timer;
28
29 static void nr_set_loopback_timer(void);
30
31 void nr_loopback_init(void)
32 {
33 skb_queue_head_init(&loopback_queue);
34
35 init_timer(&loopback_timer);
36 }
37
38 static int nr_loopback_running(void)
39 {
40 return timer_pending(&loopback_timer);
41 }
42
43 int nr_loopback_queue(struct sk_buff *skb)
44 {
45 struct sk_buff *skbn;
46
47 if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
48 memcpy(skb_put(skbn, skb->len), skb->data, skb->len);
49 skbn->h.raw = skbn->data;
50
51 skb_queue_tail(&loopback_queue, skbn);
52
53 if (!nr_loopback_running())
54 nr_set_loopback_timer();
55 }
56
57 kfree_skb(skb);
58 return 1;
59 }
60
61 static void nr_loopback_timer(unsigned long);
62
63 static void nr_set_loopback_timer(void)
64 {
65 del_timer(&loopback_timer);
66
67 loopback_timer.data = 0;
68 loopback_timer.function = &nr_loopback_timer;
69 loopback_timer.expires = jiffies + 10;
70
71 add_timer(&loopback_timer);
72 }
73
74 static void nr_loopback_timer(unsigned long param)
75 {
76 struct sk_buff *skb;
77 ax25_address *nr_dest;
78 struct net_device *dev;
79
80 if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
81 nr_dest = (ax25_address *)(skb->data + 7);
82
83 dev = nr_dev_get(nr_dest);
84
85 if (dev == NULL || nr_rx_frame(skb, dev) == 0)
86 kfree_skb(skb);
87
88 if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
89 nr_set_loopback_timer();
90 }
91 }
92
93 void __exit nr_loopback_clear(void)
94 {
95 struct sk_buff *skb;
96
97 del_timer(&loopback_timer);
98
99 while ((skb = skb_dequeue(&loopback_queue)) != NULL)
100 kfree_skb(skb);
101 }
102
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