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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 | * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) | |
9 | */ | |
10 | #include <linux/errno.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/socket.h> | |
13 | #include <linux/in.h> | |
14 | #include <linux/kernel.h> | |
1da177e4 LT |
15 | #include <linux/timer.h> |
16 | #include <linux/string.h> | |
17 | #include <linux/sockios.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/net.h> | |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
1da177e4 LT |
21 | #include <net/ax25.h> |
22 | #include <linux/inet.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <net/sock.h> | |
26 | #include <asm/uaccess.h> | |
1da177e4 LT |
27 | #include <linux/fcntl.h> |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
30 | ||
31 | void ax25_ds_nr_error_recovery(ax25_cb *ax25) | |
32 | { | |
33 | ax25_ds_establish_data_link(ax25); | |
34 | } | |
35 | ||
36 | /* | |
37 | * dl1bke 960114: transmit I frames on DAMA poll | |
38 | */ | |
39 | void ax25_ds_enquiry_response(ax25_cb *ax25) | |
40 | { | |
41 | ax25_cb *ax25o; | |
1da177e4 | 42 | |
96de0e25 | 43 | /* Please note that neither DK4EG's nor DG2FEF's |
1da177e4 LT |
44 | * DAMA spec mention the following behaviour as seen |
45 | * with TheFirmware: | |
46 | * | |
47 | * DB0ACH->DL1BKE <RR C P R0> [DAMA] | |
48 | * DL1BKE->DB0ACH <I NR=0 NS=0> | |
49 | * DL1BKE-7->DB0PRA-6 DB0ACH <I C S3 R5> | |
50 | * DL1BKE->DB0ACH <RR R F R0> | |
51 | * | |
52 | * The Flexnet DAMA Master implementation apparently | |
53 | * insists on the "proper" AX.25 behaviour: | |
54 | * | |
55 | * DB0ACH->DL1BKE <RR C P R0> [DAMA] | |
56 | * DL1BKE->DB0ACH <RR R F R0> | |
57 | * DL1BKE->DB0ACH <I NR=0 NS=0> | |
58 | * DL1BKE-7->DB0PRA-6 DB0ACH <I C S3 R5> | |
59 | * | |
60 | * Flexnet refuses to send us *any* I frame if we send | |
61 | * a REJ in case AX25_COND_REJECT is set. It is superfluous in | |
62 | * this mode anyway (a RR or RNR invokes the retransmission). | |
63 | * Is this a Flexnet bug? | |
64 | */ | |
65 | ||
66 | ax25_std_enquiry_response(ax25); | |
67 | ||
68 | if (!(ax25->condition & AX25_COND_PEER_RX_BUSY)) { | |
69 | ax25_requeue_frames(ax25); | |
70 | ax25_kick(ax25); | |
71 | } | |
72 | ||
73 | if (ax25->state == AX25_STATE_1 || ax25->state == AX25_STATE_2 || skb_peek(&ax25->ack_queue) != NULL) | |
74 | ax25_ds_t1_timeout(ax25); | |
75 | else | |
76 | ax25->n2count = 0; | |
77 | ||
78 | ax25_start_t3timer(ax25); | |
79 | ax25_ds_set_timer(ax25->ax25_dev); | |
80 | ||
c19c4b9c | 81 | spin_lock(&ax25_list_lock); |
b67bfe0d | 82 | ax25_for_each(ax25o, &ax25_list) { |
1da177e4 LT |
83 | if (ax25o == ax25) |
84 | continue; | |
85 | ||
86 | if (ax25o->ax25_dev != ax25->ax25_dev) | |
87 | continue; | |
88 | ||
89 | if (ax25o->state == AX25_STATE_1 || ax25o->state == AX25_STATE_2) { | |
90 | ax25_ds_t1_timeout(ax25o); | |
91 | continue; | |
92 | } | |
93 | ||
94 | if (!(ax25o->condition & AX25_COND_PEER_RX_BUSY) && ax25o->state == AX25_STATE_3) { | |
95 | ax25_requeue_frames(ax25o); | |
96 | ax25_kick(ax25o); | |
97 | } | |
98 | ||
99 | if (ax25o->state == AX25_STATE_1 || ax25o->state == AX25_STATE_2 || skb_peek(&ax25o->ack_queue) != NULL) | |
100 | ax25_ds_t1_timeout(ax25o); | |
101 | ||
102 | /* do not start T3 for listening sockets (tnx DD8NE) */ | |
103 | ||
104 | if (ax25o->state != AX25_STATE_0) | |
105 | ax25_start_t3timer(ax25o); | |
106 | } | |
c19c4b9c | 107 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
108 | } |
109 | ||
110 | void ax25_ds_establish_data_link(ax25_cb *ax25) | |
111 | { | |
112 | ax25->condition &= AX25_COND_DAMA_MODE; | |
113 | ax25->n2count = 0; | |
114 | ax25_calculate_t1(ax25); | |
115 | ax25_start_t1timer(ax25); | |
116 | ax25_stop_t2timer(ax25); | |
117 | ax25_start_t3timer(ax25); | |
118 | } | |
119 | ||
120 | /* | |
121 | * :::FIXME::: | |
122 | * This is a kludge. Not all drivers recognize kiss commands. | |
123 | * We need a driver level request to switch duplex mode, that does | |
124 | * either SCC changing, PI config or KISS as required. Currently | |
125 | * this request isn't reliable. | |
126 | */ | |
127 | static void ax25_kiss_cmd(ax25_dev *ax25_dev, unsigned char cmd, unsigned char param) | |
128 | { | |
129 | struct sk_buff *skb; | |
130 | unsigned char *p; | |
131 | ||
132 | if (ax25_dev->dev == NULL) | |
133 | return; | |
134 | ||
135 | if ((skb = alloc_skb(2, GFP_ATOMIC)) == NULL) | |
136 | return; | |
137 | ||
c1d2bbe1 | 138 | skb_reset_network_header(skb); |
1da177e4 LT |
139 | p = skb_put(skb, 2); |
140 | ||
141 | *p++ = cmd; | |
142 | *p++ = param; | |
143 | ||
56cb5156 | 144 | skb->protocol = ax25_type_trans(skb, ax25_dev->dev); |
1da177e4 LT |
145 | |
146 | dev_queue_xmit(skb); | |
147 | } | |
148 | ||
149 | /* | |
150 | * A nasty problem arises if we count the number of DAMA connections | |
151 | * wrong, especially when connections on the device already existed | |
152 | * and our network node (or the sysop) decides to turn on DAMA Master | |
153 | * mode. We thus flag the 'real' slave connections with | |
154 | * ax25->dama_slave=1 and look on every disconnect if still slave | |
155 | * connections exist. | |
156 | */ | |
157 | static int ax25_check_dama_slave(ax25_dev *ax25_dev) | |
158 | { | |
159 | ax25_cb *ax25; | |
160 | int res = 0; | |
1da177e4 | 161 | |
c19c4b9c | 162 | spin_lock(&ax25_list_lock); |
b67bfe0d | 163 | ax25_for_each(ax25, &ax25_list) |
1da177e4 LT |
164 | if (ax25->ax25_dev == ax25_dev && (ax25->condition & AX25_COND_DAMA_MODE) && ax25->state > AX25_STATE_1) { |
165 | res = 1; | |
166 | break; | |
167 | } | |
c19c4b9c | 168 | spin_unlock(&ax25_list_lock); |
1da177e4 LT |
169 | |
170 | return res; | |
171 | } | |
172 | ||
173 | static void ax25_dev_dama_on(ax25_dev *ax25_dev) | |
174 | { | |
175 | if (ax25_dev == NULL) | |
176 | return; | |
177 | ||
178 | if (ax25_dev->dama.slave == 0) | |
179 | ax25_kiss_cmd(ax25_dev, 5, 1); | |
180 | ||
181 | ax25_dev->dama.slave = 1; | |
182 | ax25_ds_set_timer(ax25_dev); | |
183 | } | |
184 | ||
185 | void ax25_dev_dama_off(ax25_dev *ax25_dev) | |
186 | { | |
187 | if (ax25_dev == NULL) | |
188 | return; | |
189 | ||
190 | if (ax25_dev->dama.slave && !ax25_check_dama_slave(ax25_dev)) { | |
191 | ax25_kiss_cmd(ax25_dev, 5, 0); | |
192 | ax25_dev->dama.slave = 0; | |
193 | ax25_ds_del_timer(ax25_dev); | |
194 | } | |
195 | } | |
196 | ||
197 | void ax25_dama_on(ax25_cb *ax25) | |
198 | { | |
199 | ax25_dev_dama_on(ax25->ax25_dev); | |
200 | ax25->condition |= AX25_COND_DAMA_MODE; | |
201 | } | |
202 | ||
203 | void ax25_dama_off(ax25_cb *ax25) | |
204 | { | |
205 | ax25->condition &= ~AX25_COND_DAMA_MODE; | |
206 | ax25_dev_dama_off(ax25->ax25_dev); | |
207 | } | |
208 |