ipv4: Do not use dead fib_info entries.
[linux-2.6.git] / net / rose / rose_loopback.c
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 }