1 /*
2 * ROSE release 003
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 * ROSE 003 Jonathan(G4KLX) Created this file from nr_loopback.c.
14 *
15 */
16
17 #include <linux/types.h>
18 #include <linux/socket.h>
19 #include <linux/timer.h>
20 #include <net/ax25.h>
21 #include <linux/skbuff.h>
22 #include <net/rose.h>
23 #include <linux/init.h>
24
25 static struct sk_buff_head loopback_queue;
26 static struct timer_list loopback_timer;
27
28 static void rose_set_loopback_timer(void);
29
30 void rose_loopback_init(void)
31 {
32 skb_queue_head_init(&loopback_queue);
33
34 init_timer(&loopback_timer);
35 }
36
37 static int rose_loopback_running(void)
38 {
39 return timer_pending(&loopback_timer);
40 }
41
42 int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
43 {
44 struct sk_buff *skbn;
45
46 skbn = skb_clone(skb, GFP_ATOMIC);
47
48 kfree_skb(skb);
49
50 if (skbn != NULL) {
51 skb_queue_tail(&loopback_queue, skbn);
52
53 if (!rose_loopback_running())
54 rose_set_loopback_timer();
55 }
56
57 return 1;
58 }
59
60 static void rose_loopback_timer(unsigned long);
61
62 static void rose_set_loopback_timer(void)
63 {
64 del_timer(&loopback_timer);
65
66 loopback_timer.data = 0;
67 loopback_timer.function = &rose_loopback_timer;
68 loopback_timer.expires = jiffies + 10;
69
70 add_timer(&loopback_timer);
71 }
72
73 static void rose_loopback_timer(unsigned long param)
74 {
75 struct sk_buff *skb;
76 struct net_device *dev;
77 rose_address *dest;
78 struct sock *sk;
79 unsigned short frametype;
80 unsigned int lci_i, lci_o;
81
82 while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
83 lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
84 frametype = skb->data[2];
85 dest = (rose_address *)(skb->data + 4);
86 lci_o = 0xFFF - lci_i;
87
88 skb->h.raw = skb->data;
89
90 if ((sk = rose_find_socket(lci_o, rose_loopback_neigh)) != NULL) {
91 if (rose_process_rx_frame(sk, skb) == 0)
92 kfree_skb(skb);
93 continue;
94 }
95
96 if (frametype == ROSE_CALL_REQUEST) {
97 if ((dev = rose_dev_get(dest)) != NULL) {
98 if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
99 kfree_skb(skb);
100 } else {
101 kfree_skb(skb);
102 }
103 } else {
104 kfree_skb(skb);
105 }
106 }
107 }
108
109 void __exit rose_loopback_clear(void)
110 {
111 struct sk_buff *skb;
112
113 del_timer(&loopback_timer);
114
115 while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
116 skb->sk = NULL;
117 kfree_skb(skb);
118 }
119 }
120
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