ia64/linux-2.6.18-xen.hg

view net/ax25/ax25_ds_in.c @ 673:3161879fdf22

[IA64] xencomm: support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap

support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Tue Sep 16 21:26:15 2008 +0900 (2008-09-16)
parents 831230e53067
children
line source
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>
15 #include <linux/sched.h>
16 #include <linux/timer.h>
17 #include <linux/string.h>
18 #include <linux/sockios.h>
19 #include <linux/net.h>
20 #include <net/ax25.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
24 #include <net/sock.h>
25 #include <net/tcp_states.h>
26 #include <asm/uaccess.h>
27 #include <asm/system.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/interrupt.h>
32 /*
33 * State machine for state 1, Awaiting Connection State.
34 * The handling of the timer(s) is in file ax25_ds_timer.c.
35 * Handling of state 0 and connection release is in ax25.c.
36 */
37 static int ax25_ds_state1_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type)
38 {
39 switch (frametype) {
40 case AX25_SABM:
41 ax25->modulus = AX25_MODULUS;
42 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
43 ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
44 break;
46 case AX25_SABME:
47 ax25->modulus = AX25_EMODULUS;
48 ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
49 ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
50 break;
52 case AX25_DISC:
53 ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE);
54 break;
56 case AX25_UA:
57 ax25_calculate_rtt(ax25);
58 ax25_stop_t1timer(ax25);
59 ax25_start_t3timer(ax25);
60 ax25_start_idletimer(ax25);
61 ax25->vs = 0;
62 ax25->va = 0;
63 ax25->vr = 0;
64 ax25->state = AX25_STATE_3;
65 ax25->n2count = 0;
66 if (ax25->sk != NULL) {
67 bh_lock_sock(ax25->sk);
68 ax25->sk->sk_state = TCP_ESTABLISHED;
69 /*
70 * For WAIT_SABM connections we will produce an accept
71 * ready socket here
72 */
73 if (!sock_flag(ax25->sk, SOCK_DEAD))
74 ax25->sk->sk_state_change(ax25->sk);
75 bh_unlock_sock(ax25->sk);
76 }
77 ax25_dama_on(ax25);
79 /* according to DK4EGs spec we are required to
80 * send a RR RESPONSE FINAL NR=0.
81 */
83 ax25_std_enquiry_response(ax25);
84 break;
86 case AX25_DM:
87 if (pf)
88 ax25_disconnect(ax25, ECONNREFUSED);
89 break;
91 default:
92 if (pf)
93 ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND);
94 break;
95 }
97 return 0;
98 }
100 /*
101 * State machine for state 2, Awaiting Release State.
102 * The handling of the timer(s) is in file ax25_ds_timer.c
103 * Handling of state 0 and connection release is in ax25.c.
104 */
105 static int ax25_ds_state2_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type)
106 {
107 switch (frametype) {
108 case AX25_SABM:
109 case AX25_SABME:
110 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
111 ax25_dama_off(ax25);
112 break;
114 case AX25_DISC:
115 ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
116 ax25_dama_off(ax25);
117 ax25_disconnect(ax25, 0);
118 break;
120 case AX25_DM:
121 case AX25_UA:
122 if (pf) {
123 ax25_dama_off(ax25);
124 ax25_disconnect(ax25, 0);
125 }
126 break;
128 case AX25_I:
129 case AX25_REJ:
130 case AX25_RNR:
131 case AX25_RR:
132 if (pf) {
133 ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
134 ax25_dama_off(ax25);
135 }
136 break;
138 default:
139 break;
140 }
142 return 0;
143 }
145 /*
146 * State machine for state 3, Connected State.
147 * The handling of the timer(s) is in file ax25_timer.c
148 * Handling of state 0 and connection release is in ax25.c.
149 */
150 static int ax25_ds_state3_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type)
151 {
152 int queued = 0;
154 switch (frametype) {
155 case AX25_SABM:
156 case AX25_SABME:
157 if (frametype == AX25_SABM) {
158 ax25->modulus = AX25_MODULUS;
159 ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
160 } else {
161 ax25->modulus = AX25_EMODULUS;
162 ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW];
163 }
164 ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
165 ax25_stop_t1timer(ax25);
166 ax25_start_t3timer(ax25);
167 ax25_start_idletimer(ax25);
168 ax25->condition = 0x00;
169 ax25->vs = 0;
170 ax25->va = 0;
171 ax25->vr = 0;
172 ax25_requeue_frames(ax25);
173 ax25_dama_on(ax25);
174 break;
176 case AX25_DISC:
177 ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE);
178 ax25_dama_off(ax25);
179 ax25_disconnect(ax25, 0);
180 break;
182 case AX25_DM:
183 ax25_dama_off(ax25);
184 ax25_disconnect(ax25, ECONNRESET);
185 break;
187 case AX25_RR:
188 case AX25_RNR:
189 if (frametype == AX25_RR)
190 ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
191 else
192 ax25->condition |= AX25_COND_PEER_RX_BUSY;
194 if (ax25_validate_nr(ax25, nr)) {
195 if (ax25_check_iframes_acked(ax25, nr))
196 ax25->n2count=0;
197 if (type == AX25_COMMAND && pf)
198 ax25_ds_enquiry_response(ax25);
199 } else {
200 ax25_ds_nr_error_recovery(ax25);
201 ax25->state = AX25_STATE_1;
202 }
203 break;
205 case AX25_REJ:
206 ax25->condition &= ~AX25_COND_PEER_RX_BUSY;
208 if (ax25_validate_nr(ax25, nr)) {
209 if (ax25->va != nr)
210 ax25->n2count=0;
212 ax25_frames_acked(ax25, nr);
213 ax25_calculate_rtt(ax25);
214 ax25_stop_t1timer(ax25);
215 ax25_start_t3timer(ax25);
216 ax25_requeue_frames(ax25);
218 if (type == AX25_COMMAND && pf)
219 ax25_ds_enquiry_response(ax25);
220 } else {
221 ax25_ds_nr_error_recovery(ax25);
222 ax25->state = AX25_STATE_1;
223 }
224 break;
226 case AX25_I:
227 if (!ax25_validate_nr(ax25, nr)) {
228 ax25_ds_nr_error_recovery(ax25);
229 ax25->state = AX25_STATE_1;
230 break;
231 }
232 if (ax25->condition & AX25_COND_PEER_RX_BUSY) {
233 ax25_frames_acked(ax25, nr);
234 ax25->n2count = 0;
235 } else {
236 if (ax25_check_iframes_acked(ax25, nr))
237 ax25->n2count = 0;
238 }
239 if (ax25->condition & AX25_COND_OWN_RX_BUSY) {
240 if (pf) ax25_ds_enquiry_response(ax25);
241 break;
242 }
243 if (ns == ax25->vr) {
244 ax25->vr = (ax25->vr + 1) % ax25->modulus;
245 queued = ax25_rx_iframe(ax25, skb);
246 if (ax25->condition & AX25_COND_OWN_RX_BUSY)
247 ax25->vr = ns; /* ax25->vr - 1 */
248 ax25->condition &= ~AX25_COND_REJECT;
249 if (pf) {
250 ax25_ds_enquiry_response(ax25);
251 } else {
252 if (!(ax25->condition & AX25_COND_ACK_PENDING)) {
253 ax25->condition |= AX25_COND_ACK_PENDING;
254 ax25_start_t2timer(ax25);
255 }
256 }
257 } else {
258 if (ax25->condition & AX25_COND_REJECT) {
259 if (pf) ax25_ds_enquiry_response(ax25);
260 } else {
261 ax25->condition |= AX25_COND_REJECT;
262 ax25_ds_enquiry_response(ax25);
263 ax25->condition &= ~AX25_COND_ACK_PENDING;
264 }
265 }
266 break;
268 case AX25_FRMR:
269 case AX25_ILLEGAL:
270 ax25_ds_establish_data_link(ax25);
271 ax25->state = AX25_STATE_1;
272 break;
274 default:
275 break;
276 }
278 return queued;
279 }
281 /*
282 * Higher level upcall for a LAPB frame
283 */
284 int ax25_ds_frame_in(ax25_cb *ax25, struct sk_buff *skb, int type)
285 {
286 int queued = 0, frametype, ns, nr, pf;
288 frametype = ax25_decode(ax25, skb, &ns, &nr, &pf);
290 switch (ax25->state) {
291 case AX25_STATE_1:
292 queued = ax25_ds_state1_machine(ax25, skb, frametype, pf, type);
293 break;
294 case AX25_STATE_2:
295 queued = ax25_ds_state2_machine(ax25, skb, frametype, pf, type);
296 break;
297 case AX25_STATE_3:
298 queued = ax25_ds_state3_machine(ax25, skb, frametype, ns, nr, pf, type);
299 break;
300 }
302 return queued;
303 }