Root/
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/slab.h> |
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 | if (skb->len < ROSE_MIN_LEN) { |
77 | kfree_skb(skb); |
78 | continue; |
79 | } |
80 | lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); |
81 | frametype = skb->data[2]; |
82 | if (frametype == ROSE_CALL_REQUEST && |
83 | (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || |
84 | skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != |
85 | ROSE_CALL_REQ_ADDR_LEN_VAL)) { |
86 | kfree_skb(skb); |
87 | continue; |
88 | } |
89 | dest = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); |
90 | lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i; |
91 | |
92 | skb_reset_transport_header(skb); |
93 | |
94 | sk = rose_find_socket(lci_o, rose_loopback_neigh); |
95 | if (sk) { |
96 | if (rose_process_rx_frame(sk, skb) == 0) |
97 | kfree_skb(skb); |
98 | continue; |
99 | } |
100 | |
101 | if (frametype == ROSE_CALL_REQUEST) { |
102 | if ((dev = rose_dev_get(dest)) != NULL) { |
103 | if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) |
104 | kfree_skb(skb); |
105 | } else { |
106 | kfree_skb(skb); |
107 | } |
108 | } else { |
109 | kfree_skb(skb); |
110 | } |
111 | } |
112 | } |
113 | |
114 | void __exit rose_loopback_clear(void) |
115 | { |
116 | struct sk_buff *skb; |
117 | |
118 | del_timer(&loopback_timer); |
119 | |
120 | while ((skb = skb_dequeue(&loopback_queue)) != NULL) { |
121 | skb->sk = NULL; |
122 | kfree_skb(skb); |
123 | } |
124 | } |
125 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9