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1da177e4 LT |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License, or | |
5 | * (at your option) any later version. | |
6 | * | |
7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
8 | */ | |
9 | #include <linux/types.h> | |
10 | #include <linux/socket.h> | |
11 | #include <linux/timer.h> | |
12 | #include <net/ax25.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <net/rose.h> | |
15 | #include <linux/init.h> | |
16 | ||
17 | static struct sk_buff_head loopback_queue; | |
18 | static struct timer_list loopback_timer; | |
19 | ||
20 | static void rose_set_loopback_timer(void); | |
21 | ||
22 | void rose_loopback_init(void) | |
23 | { | |
24 | skb_queue_head_init(&loopback_queue); | |
25 | ||
26 | init_timer(&loopback_timer); | |
27 | } | |
28 | ||
29 | static int rose_loopback_running(void) | |
30 | { | |
31 | return timer_pending(&loopback_timer); | |
32 | } | |
33 | ||
34 | int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh) | |
35 | { | |
36 | struct sk_buff *skbn; | |
37 | ||
38 | skbn = skb_clone(skb, GFP_ATOMIC); | |
39 | ||
40 | kfree_skb(skb); | |
41 | ||
42 | if (skbn != NULL) { | |
43 | skb_queue_tail(&loopback_queue, skbn); | |
44 | ||
45 | if (!rose_loopback_running()) | |
46 | rose_set_loopback_timer(); | |
47 | } | |
48 | ||
49 | return 1; | |
50 | } | |
51 | ||
52 | static void rose_loopback_timer(unsigned long); | |
53 | ||
54 | static void rose_set_loopback_timer(void) | |
55 | { | |
56 | del_timer(&loopback_timer); | |
57 | ||
58 | loopback_timer.data = 0; | |
59 | loopback_timer.function = &rose_loopback_timer; | |
60 | loopback_timer.expires = jiffies + 10; | |
61 | ||
62 | add_timer(&loopback_timer); | |
63 | } | |
64 | ||
65 | static void rose_loopback_timer(unsigned long param) | |
66 | { | |
67 | struct sk_buff *skb; | |
68 | struct net_device *dev; | |
69 | rose_address *dest; | |
70 | struct sock *sk; | |
71 | unsigned short frametype; | |
72 | unsigned int lci_i, lci_o; | |
73 | ||
74 | while ((skb = skb_dequeue(&loopback_queue)) != NULL) { | |
75 | lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); | |
76 | frametype = skb->data[2]; | |
77 | dest = (rose_address *)(skb->data + 4); | |
78 | lci_o = 0xFFF - lci_i; | |
79 | ||
80 | skb->h.raw = skb->data; | |
81 | ||
82 | if ((sk = rose_find_socket(lci_o, rose_loopback_neigh)) != NULL) { | |
83 | if (rose_process_rx_frame(sk, skb) == 0) | |
84 | kfree_skb(skb); | |
85 | continue; | |
86 | } | |
87 | ||
88 | if (frametype == ROSE_CALL_REQUEST) { | |
89 | if ((dev = rose_dev_get(dest)) != NULL) { | |
90 | if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) | |
91 | kfree_skb(skb); | |
92 | } else { | |
93 | kfree_skb(skb); | |
94 | } | |
95 | } else { | |
96 | kfree_skb(skb); | |
97 | } | |
98 | } | |
99 | } | |
100 | ||
101 | void __exit rose_loopback_clear(void) | |
102 | { | |
103 | struct sk_buff *skb; | |
104 | ||
105 | del_timer(&loopback_timer); | |
106 | ||
107 | while ((skb = skb_dequeue(&loopback_queue)) != NULL) { | |
108 | skb->sk = NULL; | |
109 | kfree_skb(skb); | |
110 | } | |
111 | } |