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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> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
1da177e4 LT |
11 | #include <linux/socket.h> |
12 | #include <linux/timer.h> | |
13 | #include <net/ax25.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <net/rose.h> | |
16 | #include <linux/init.h> | |
17 | ||
18 | static struct sk_buff_head loopback_queue; | |
19 | static struct timer_list loopback_timer; | |
20 | ||
21 | static void rose_set_loopback_timer(void); | |
22 | ||
23 | void rose_loopback_init(void) | |
24 | { | |
25 | skb_queue_head_init(&loopback_queue); | |
26 | ||
27 | init_timer(&loopback_timer); | |
28 | } | |
29 | ||
30 | static int rose_loopback_running(void) | |
31 | { | |
32 | return timer_pending(&loopback_timer); | |
33 | } | |
34 | ||
35 | int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh) | |
36 | { | |
37 | struct sk_buff *skbn; | |
38 | ||
39 | skbn = skb_clone(skb, GFP_ATOMIC); | |
40 | ||
41 | kfree_skb(skb); | |
42 | ||
43 | if (skbn != NULL) { | |
44 | skb_queue_tail(&loopback_queue, skbn); | |
45 | ||
46 | if (!rose_loopback_running()) | |
47 | rose_set_loopback_timer(); | |
48 | } | |
49 | ||
50 | return 1; | |
51 | } | |
52 | ||
53 | static void rose_loopback_timer(unsigned long); | |
54 | ||
55 | static void rose_set_loopback_timer(void) | |
56 | { | |
57 | del_timer(&loopback_timer); | |
58 | ||
59 | loopback_timer.data = 0; | |
60 | loopback_timer.function = &rose_loopback_timer; | |
61 | loopback_timer.expires = jiffies + 10; | |
62 | ||
63 | add_timer(&loopback_timer); | |
64 | } | |
65 | ||
66 | static void rose_loopback_timer(unsigned long param) | |
67 | { | |
68 | struct sk_buff *skb; | |
69 | struct net_device *dev; | |
70 | rose_address *dest; | |
71 | struct sock *sk; | |
72 | unsigned short frametype; | |
73 | unsigned int lci_i, lci_o; | |
74 | ||
75 | while ((skb = skb_dequeue(&loopback_queue)) != NULL) { | |
76 | lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); | |
77 | frametype = skb->data[2]; | |
78 | dest = (rose_address *)(skb->data + 4); | |
1f731b63 | 79 | lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i; |
1da177e4 | 80 | |
badff6d0 | 81 | skb_reset_transport_header(skb); |
1da177e4 | 82 | |
891e6a93 | 83 | sk = rose_find_socket(lci_o, rose_loopback_neigh); |
a3d38402 | 84 | if (sk) { |
1da177e4 LT |
85 | if (rose_process_rx_frame(sk, skb) == 0) |
86 | kfree_skb(skb); | |
87 | continue; | |
88 | } | |
89 | ||
90 | if (frametype == ROSE_CALL_REQUEST) { | |
91 | if ((dev = rose_dev_get(dest)) != NULL) { | |
891e6a93 | 92 | if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) |
1da177e4 LT |
93 | kfree_skb(skb); |
94 | } else { | |
95 | kfree_skb(skb); | |
96 | } | |
97 | } else { | |
98 | kfree_skb(skb); | |
99 | } | |
100 | } | |
101 | } | |
102 | ||
103 | void __exit rose_loopback_clear(void) | |
104 | { | |
105 | struct sk_buff *skb; | |
106 | ||
107 | del_timer(&loopback_timer); | |
108 | ||
109 | while ((skb = skb_dequeue(&loopback_queue)) != NULL) { | |
110 | skb->sk = NULL; | |
111 | kfree_skb(skb); | |
112 | } | |
113 | } |