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/errno.h> |
10 | #include <linux/types.h> |
11 | #include <linux/socket.h> |
12 | #include <linux/in.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/timer.h> |
15 | #include <linux/string.h> |
16 | #include <linux/sockios.h> |
17 | #include <linux/net.h> |
18 | #include <linux/gfp.h> |
19 | #include <net/ax25.h> |
20 | #include <linux/inet.h> |
21 | #include <linux/netdevice.h> |
22 | #include <linux/skbuff.h> |
23 | #include <net/sock.h> |
24 | #include <asm/system.h> |
25 | #include <linux/fcntl.h> |
26 | #include <linux/mm.h> |
27 | #include <linux/interrupt.h> |
28 | #include <net/rose.h> |
29 | |
30 | /* |
31 | * This procedure is passed a buffer descriptor for an iframe. It builds |
32 | * the rest of the control part of the frame and then writes it out. |
33 | */ |
34 | static void rose_send_iframe(struct sock *sk, struct sk_buff *skb) |
35 | { |
36 | struct rose_sock *rose = rose_sk(sk); |
37 | |
38 | if (skb == NULL) |
39 | return; |
40 | |
41 | skb->data[2] |= (rose->vr << 5) & 0xE0; |
42 | skb->data[2] |= (rose->vs << 1) & 0x0E; |
43 | |
44 | rose_start_idletimer(sk); |
45 | |
46 | rose_transmit_link(skb, rose->neighbour); |
47 | } |
48 | |
49 | void rose_kick(struct sock *sk) |
50 | { |
51 | struct rose_sock *rose = rose_sk(sk); |
52 | struct sk_buff *skb, *skbn; |
53 | unsigned short start, end; |
54 | |
55 | if (rose->state != ROSE_STATE_3) |
56 | return; |
57 | |
58 | if (rose->condition & ROSE_COND_PEER_RX_BUSY) |
59 | return; |
60 | |
61 | if (!skb_peek(&sk->sk_write_queue)) |
62 | return; |
63 | |
64 | start = (skb_peek(&rose->ack_queue) == NULL) ? rose->va : rose->vs; |
65 | end = (rose->va + sysctl_rose_window_size) % ROSE_MODULUS; |
66 | |
67 | if (start == end) |
68 | return; |
69 | |
70 | rose->vs = start; |
71 | |
72 | /* |
73 | * Transmit data until either we're out of data to send or |
74 | * the window is full. |
75 | */ |
76 | |
77 | skb = skb_dequeue(&sk->sk_write_queue); |
78 | |
79 | do { |
80 | if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { |
81 | skb_queue_head(&sk->sk_write_queue, skb); |
82 | break; |
83 | } |
84 | |
85 | skb_set_owner_w(skbn, sk); |
86 | |
87 | /* |
88 | * Transmit the frame copy. |
89 | */ |
90 | rose_send_iframe(sk, skbn); |
91 | |
92 | rose->vs = (rose->vs + 1) % ROSE_MODULUS; |
93 | |
94 | /* |
95 | * Requeue the original data frame. |
96 | */ |
97 | skb_queue_tail(&rose->ack_queue, skb); |
98 | |
99 | } while (rose->vs != end && |
100 | (skb = skb_dequeue(&sk->sk_write_queue)) != NULL); |
101 | |
102 | rose->vl = rose->vr; |
103 | rose->condition &= ~ROSE_COND_ACK_PENDING; |
104 | |
105 | rose_stop_timer(sk); |
106 | } |
107 | |
108 | /* |
109 | * The following routines are taken from page 170 of the 7th ARRL Computer |
110 | * Networking Conference paper, as is the whole state machine. |
111 | */ |
112 | |
113 | void rose_enquiry_response(struct sock *sk) |
114 | { |
115 | struct rose_sock *rose = rose_sk(sk); |
116 | |
117 | if (rose->condition & ROSE_COND_OWN_RX_BUSY) |
118 | rose_write_internal(sk, ROSE_RNR); |
119 | else |
120 | rose_write_internal(sk, ROSE_RR); |
121 | |
122 | rose->vl = rose->vr; |
123 | rose->condition &= ~ROSE_COND_ACK_PENDING; |
124 | |
125 | rose_stop_timer(sk); |
126 | } |
127 |
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