Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * llc_c_ev.c - Connection component state transition event qualifiers | |
3 | * | |
4 | * A 'state' consists of a number of possible event matching functions, | |
5 | * the actions associated with each being executed when that event is | |
6 | * matched; a 'state machine' accepts events in a serial fashion from an | |
7 | * event queue. Each event is passed to each successive event matching | |
8 | * function until a match is made (the event matching function returns | |
9 | * success, or '0') or the list of event matching functions is exhausted. | |
10 | * If a match is made, the actions associated with the event are executed | |
11 | * and the state is changed to that event's transition state. Before some | |
12 | * events are recognized, even after a match has been made, a certain | |
13 | * number of 'event qualifier' functions must also be executed. If these | |
14 | * all execute successfully, then the event is finally executed. | |
15 | * | |
16 | * These event functions must return 0 for success, to show a matched | |
17 | * event, of 1 if the event does not match. Event qualifier functions | |
18 | * must return a 0 for success or a non-zero for failure. Each function | |
19 | * is simply responsible for verifying one single thing and returning | |
20 | * either a success or failure. | |
21 | * | |
22 | * All of followed event functions are described in 802.2 LLC Protocol | |
23 | * standard document except two functions that we added that will explain | |
24 | * in their comments, at below. | |
25 | * | |
26 | * Copyright (c) 1997 by Procom Technology, Inc. | |
27 | * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
28 | * | |
29 | * This program can be redistributed or modified under the terms of the | |
30 | * GNU General Public License as published by the Free Software Foundation. | |
31 | * This program is distributed without any warranty or implied warranty | |
32 | * of merchantability or fitness for a particular purpose. | |
33 | * | |
34 | * See the GNU General Public License for more details. | |
35 | */ | |
36 | #include <linux/netdevice.h> | |
37 | #include <net/llc_conn.h> | |
38 | #include <net/llc_sap.h> | |
39 | #include <net/sock.h> | |
40 | #include <net/llc_c_ev.h> | |
41 | #include <net/llc_pdu.h> | |
42 | ||
43 | #if 1 | |
44 | #define dprintk(args...) printk(KERN_DEBUG args) | |
45 | #else | |
46 | #define dprintk(args...) | |
47 | #endif | |
48 | ||
49 | extern u16 llc_circular_between(u8 a, u8 b, u8 c); | |
50 | ||
51 | /** | |
52 | * llc_util_ns_inside_rx_window - check if sequence number is in rx window | |
53 | * @ns: sequence number of received pdu. | |
54 | * @vr: sequence number which receiver expects to receive. | |
55 | * @rw: receive window size of receiver. | |
56 | * | |
57 | * Checks if sequence number of received PDU is in range of receive | |
58 | * window. Returns 0 for success, 1 otherwise | |
59 | */ | |
60 | static u16 llc_util_ns_inside_rx_window(u8 ns, u8 vr, u8 rw) | |
61 | { | |
62 | return !llc_circular_between(vr, ns, | |
63 | (vr + rw - 1) % LLC_2_SEQ_NBR_MODULO); | |
64 | } | |
65 | ||
66 | /** | |
67 | * llc_util_nr_inside_tx_window - check if sequence number is in tx window | |
68 | * @sk: current connection. | |
69 | * @nr: N(R) of received PDU. | |
70 | * | |
71 | * This routine checks if N(R) of received PDU is in range of transmit | |
72 | * window; on the other hand checks if received PDU acknowledges some | |
73 | * outstanding PDUs that are in transmit window. Returns 0 for success, 1 | |
74 | * otherwise. | |
75 | */ | |
76 | static u16 llc_util_nr_inside_tx_window(struct sock *sk, u8 nr) | |
77 | { | |
78 | u8 nr1, nr2; | |
79 | struct sk_buff *skb; | |
80 | struct llc_pdu_sn *pdu; | |
81 | struct llc_sock *llc = llc_sk(sk); | |
82 | int rc = 0; | |
83 | ||
84 | if (llc->dev->flags & IFF_LOOPBACK) | |
85 | goto out; | |
86 | rc = 1; | |
b03efcfb | 87 | if (skb_queue_empty(&llc->pdu_unack_q)) |
1da177e4 LT |
88 | goto out; |
89 | skb = skb_peek(&llc->pdu_unack_q); | |
90 | pdu = llc_pdu_sn_hdr(skb); | |
91 | nr1 = LLC_I_GET_NS(pdu); | |
92 | skb = skb_peek_tail(&llc->pdu_unack_q); | |
93 | pdu = llc_pdu_sn_hdr(skb); | |
94 | nr2 = LLC_I_GET_NS(pdu); | |
95 | rc = !llc_circular_between(nr1, nr, (nr2 + 1) % LLC_2_SEQ_NBR_MODULO); | |
96 | out: | |
97 | return rc; | |
98 | } | |
99 | ||
100 | int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb) | |
101 | { | |
102 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
103 | ||
104 | return ev->prim == LLC_CONN_PRIM && | |
105 | ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; | |
106 | } | |
107 | ||
108 | int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb) | |
109 | { | |
110 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
111 | ||
112 | return ev->prim == LLC_DATA_PRIM && | |
113 | ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; | |
114 | } | |
115 | ||
116 | int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb) | |
117 | { | |
118 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
119 | ||
120 | return ev->prim == LLC_DISC_PRIM && | |
121 | ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; | |
122 | } | |
123 | ||
124 | int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb) | |
125 | { | |
126 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
127 | ||
128 | return ev->prim == LLC_RESET_PRIM && | |
129 | ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; | |
130 | } | |
131 | ||
132 | int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb) | |
133 | { | |
134 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
135 | ||
136 | return ev->type == LLC_CONN_EV_TYPE_SIMPLE && | |
137 | ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_DETECTED ? 0 : 1; | |
138 | } | |
139 | ||
140 | int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb) | |
141 | { | |
142 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
143 | ||
144 | return ev->type == LLC_CONN_EV_TYPE_SIMPLE && | |
145 | ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_CLEARED ? 0 : 1; | |
146 | } | |
147 | ||
148 | int llc_conn_ev_rx_bad_pdu(struct sock *sk, struct sk_buff *skb) | |
149 | { | |
150 | return 1; | |
151 | } | |
152 | ||
153 | int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb) | |
154 | { | |
155 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
156 | ||
157 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) && | |
158 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1; | |
159 | } | |
160 | ||
161 | int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) | |
162 | { | |
163 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
164 | ||
165 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && | |
166 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM ? 0 : 1; | |
167 | } | |
168 | ||
169 | int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) | |
170 | { | |
171 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
172 | ||
173 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && | |
174 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR ? 0 : 1; | |
175 | } | |
176 | ||
177 | int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) | |
178 | { | |
179 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
180 | ||
181 | return llc_conn_space(sk, skb) && | |
182 | LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
183 | LLC_I_PF_IS_0(pdu) && | |
184 | LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; | |
185 | } | |
186 | ||
187 | int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) | |
188 | { | |
189 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
190 | ||
191 | return llc_conn_space(sk, skb) && | |
192 | LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
193 | LLC_I_PF_IS_1(pdu) && | |
194 | LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; | |
195 | } | |
196 | ||
197 | int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk, | |
198 | struct sk_buff *skb) | |
199 | { | |
200 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
201 | u8 vr = llc_sk(sk)->vR; | |
202 | u8 ns = LLC_I_GET_NS(pdu); | |
203 | ||
204 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
205 | LLC_I_PF_IS_0(pdu) && ns != vr && | |
206 | !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
207 | } | |
208 | ||
209 | int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk, | |
210 | struct sk_buff *skb) | |
211 | { | |
212 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
213 | u8 vr = llc_sk(sk)->vR; | |
214 | u8 ns = LLC_I_GET_NS(pdu); | |
215 | ||
216 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
217 | LLC_I_PF_IS_1(pdu) && ns != vr && | |
218 | !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
219 | } | |
220 | ||
221 | int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk, | |
222 | struct sk_buff *skb) | |
223 | { | |
224 | struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb); | |
225 | u8 vr = llc_sk(sk)->vR; | |
226 | u8 ns = LLC_I_GET_NS(pdu); | |
227 | u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr && | |
228 | llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
229 | if (!rc) | |
230 | dprintk("%s: matched, state=%d, ns=%d, vr=%d\n", | |
231 | __FUNCTION__, llc_sk(sk)->state, ns, vr); | |
232 | return rc; | |
233 | } | |
234 | ||
235 | int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) | |
236 | { | |
237 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
238 | ||
239 | return llc_conn_space(sk, skb) && | |
240 | LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
241 | LLC_I_PF_IS_0(pdu) && | |
242 | LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; | |
243 | } | |
244 | ||
245 | int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) | |
246 | { | |
247 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
248 | ||
249 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
250 | LLC_I_PF_IS_1(pdu) && | |
251 | LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; | |
252 | } | |
253 | ||
254 | int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) | |
255 | { | |
256 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
257 | ||
258 | return llc_conn_space(sk, skb) && | |
259 | LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
260 | LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; | |
261 | } | |
262 | ||
263 | int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk, | |
264 | struct sk_buff *skb) | |
265 | { | |
266 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
267 | u8 vr = llc_sk(sk)->vR; | |
268 | u8 ns = LLC_I_GET_NS(pdu); | |
269 | ||
270 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
271 | LLC_I_PF_IS_0(pdu) && ns != vr && | |
272 | !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
273 | } | |
274 | ||
275 | int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk, | |
276 | struct sk_buff *skb) | |
277 | { | |
278 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
279 | u8 vr = llc_sk(sk)->vR; | |
280 | u8 ns = LLC_I_GET_NS(pdu); | |
281 | ||
282 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && | |
283 | LLC_I_PF_IS_1(pdu) && ns != vr && | |
284 | !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
285 | } | |
286 | ||
287 | int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk, | |
288 | struct sk_buff *skb) | |
289 | { | |
290 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
291 | u8 vr = llc_sk(sk)->vR; | |
292 | u8 ns = LLC_I_GET_NS(pdu); | |
293 | ||
294 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr && | |
295 | !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
296 | } | |
297 | ||
298 | int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk, | |
299 | struct sk_buff *skb) | |
300 | { | |
301 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
302 | u8 vr = llc_sk(sk)->vR; | |
303 | u8 ns = LLC_I_GET_NS(pdu); | |
304 | u16 rc = LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr && | |
305 | llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; | |
306 | if (!rc) | |
307 | dprintk("%s: matched, state=%d, ns=%d, vr=%d\n", | |
308 | __FUNCTION__, llc_sk(sk)->state, ns, vr); | |
309 | return rc; | |
310 | } | |
311 | ||
312 | int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) | |
313 | { | |
314 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
315 | ||
316 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
317 | LLC_S_PF_IS_0(pdu) && | |
318 | LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1; | |
319 | } | |
320 | ||
321 | int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) | |
322 | { | |
323 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
324 | ||
325 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
326 | LLC_S_PF_IS_1(pdu) && | |
327 | LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1; | |
328 | } | |
329 | ||
330 | int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) | |
331 | { | |
332 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
333 | ||
334 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
335 | LLC_S_PF_IS_0(pdu) && | |
336 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1; | |
337 | } | |
338 | ||
339 | int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) | |
340 | { | |
341 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
342 | ||
343 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
344 | LLC_S_PF_IS_1(pdu) && | |
345 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1; | |
346 | } | |
347 | ||
348 | int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) | |
349 | { | |
350 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
351 | ||
352 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
353 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1; | |
354 | } | |
355 | ||
356 | int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) | |
357 | { | |
358 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
359 | ||
360 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
361 | LLC_S_PF_IS_0(pdu) && | |
362 | LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1; | |
363 | } | |
364 | ||
365 | int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) | |
366 | { | |
367 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
368 | ||
369 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
370 | LLC_S_PF_IS_1(pdu) && | |
371 | LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1; | |
372 | } | |
373 | ||
374 | int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) | |
375 | { | |
376 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
377 | ||
378 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
379 | LLC_S_PF_IS_0(pdu) && | |
380 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1; | |
381 | } | |
382 | ||
383 | int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) | |
384 | { | |
385 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
386 | ||
387 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
388 | LLC_S_PF_IS_1(pdu) && | |
389 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1; | |
390 | } | |
391 | ||
392 | int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) | |
393 | { | |
394 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
395 | ||
396 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
397 | LLC_S_PF_IS_0(pdu) && | |
398 | LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1; | |
399 | } | |
400 | ||
401 | int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) | |
402 | { | |
403 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
404 | ||
405 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
406 | LLC_S_PF_IS_1(pdu) && | |
407 | LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1; | |
408 | } | |
409 | ||
410 | int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) | |
411 | { | |
412 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
413 | ||
414 | return llc_conn_space(sk, skb) && | |
415 | LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
416 | LLC_S_PF_IS_0(pdu) && | |
417 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1; | |
418 | } | |
419 | ||
420 | int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) | |
421 | { | |
422 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
423 | ||
424 | return llc_conn_space(sk, skb) && | |
425 | LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && | |
426 | LLC_S_PF_IS_1(pdu) && | |
427 | LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1; | |
428 | } | |
429 | ||
430 | int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb) | |
431 | { | |
432 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
433 | ||
434 | return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) && | |
435 | LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1; | |
436 | } | |
437 | ||
438 | int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) | |
439 | { | |
440 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
441 | ||
442 | return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && | |
443 | LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_UA ? 0 : 1; | |
444 | } | |
445 | ||
446 | int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) | |
447 | { | |
448 | u16 rc = 1; | |
449 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
450 | ||
451 | if (LLC_PDU_IS_CMD(pdu)) { | |
452 | if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) { | |
453 | if (LLC_I_PF_IS_1(pdu)) | |
454 | rc = 0; | |
455 | } else if (LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PF_IS_1(pdu)) | |
456 | rc = 0; | |
457 | } | |
458 | return rc; | |
459 | } | |
460 | ||
461 | int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb) | |
462 | { | |
463 | u16 rc = 1; | |
464 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
465 | ||
466 | if (LLC_PDU_IS_CMD(pdu)) { | |
467 | if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) | |
468 | rc = 0; | |
469 | else if (LLC_PDU_TYPE_IS_U(pdu)) | |
470 | switch (LLC_U_PDU_CMD(pdu)) { | |
471 | case LLC_2_PDU_CMD_SABME: | |
472 | case LLC_2_PDU_CMD_DISC: | |
473 | rc = 0; | |
474 | break; | |
475 | } | |
476 | } | |
477 | return rc; | |
478 | } | |
479 | ||
480 | int llc_conn_ev_rx_xxx_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) | |
481 | { | |
482 | u16 rc = 1; | |
483 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
484 | ||
485 | if (LLC_PDU_IS_RSP(pdu)) { | |
486 | if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) { | |
487 | if (LLC_I_PF_IS_1(pdu)) | |
488 | rc = 0; | |
489 | } else if (LLC_PDU_TYPE_IS_U(pdu)) | |
490 | switch (LLC_U_PDU_RSP(pdu)) { | |
491 | case LLC_2_PDU_RSP_UA: | |
492 | case LLC_2_PDU_RSP_DM: | |
493 | case LLC_2_PDU_RSP_FRMR: | |
494 | if (LLC_U_PF_IS_1(pdu)) | |
495 | rc = 0; | |
496 | break; | |
497 | } | |
498 | } | |
499 | return rc; | |
500 | } | |
501 | ||
502 | int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) | |
503 | { | |
504 | u16 rc = 1; | |
505 | struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); | |
506 | ||
507 | if (LLC_PDU_IS_RSP(pdu)) { | |
508 | if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) | |
509 | rc = 0; | |
510 | else if (LLC_PDU_TYPE_IS_U(pdu)) | |
511 | switch (LLC_U_PDU_RSP(pdu)) { | |
512 | case LLC_2_PDU_RSP_UA: | |
513 | case LLC_2_PDU_RSP_DM: | |
514 | case LLC_2_PDU_RSP_FRMR: | |
515 | rc = 0; | |
516 | break; | |
517 | } | |
518 | } | |
519 | ||
520 | return rc; | |
521 | } | |
522 | ||
523 | int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk, | |
524 | struct sk_buff *skb) | |
525 | { | |
526 | u16 rc = 1; | |
527 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
528 | u8 vs = llc_sk(sk)->vS; | |
529 | u8 nr = LLC_I_GET_NR(pdu); | |
530 | ||
531 | if (LLC_PDU_IS_CMD(pdu) && | |
532 | (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) && | |
533 | nr != vs && llc_util_nr_inside_tx_window(sk, nr)) { | |
534 | dprintk("%s: matched, state=%d, vs=%d, nr=%d\n", | |
535 | __FUNCTION__, llc_sk(sk)->state, vs, nr); | |
536 | rc = 0; | |
537 | } | |
538 | return rc; | |
539 | } | |
540 | ||
541 | int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk, | |
542 | struct sk_buff *skb) | |
543 | { | |
544 | u16 rc = 1; | |
545 | struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); | |
546 | u8 vs = llc_sk(sk)->vS; | |
547 | u8 nr = LLC_I_GET_NR(pdu); | |
548 | ||
549 | if (LLC_PDU_IS_RSP(pdu) && | |
550 | (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) && | |
551 | nr != vs && llc_util_nr_inside_tx_window(sk, nr)) { | |
552 | rc = 0; | |
553 | dprintk("%s: matched, state=%d, vs=%d, nr=%d\n", | |
554 | __FUNCTION__, llc_sk(sk)->state, vs, nr); | |
555 | } | |
556 | return rc; | |
557 | } | |
558 | ||
559 | int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb) | |
560 | { | |
561 | return 0; | |
562 | } | |
563 | ||
564 | int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb) | |
565 | { | |
566 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
567 | ||
568 | return ev->type != LLC_CONN_EV_TYPE_P_TMR; | |
569 | } | |
570 | ||
571 | int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb) | |
572 | { | |
573 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
574 | ||
575 | return ev->type != LLC_CONN_EV_TYPE_ACK_TMR; | |
576 | } | |
577 | ||
578 | int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb) | |
579 | { | |
580 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
581 | ||
582 | return ev->type != LLC_CONN_EV_TYPE_REJ_TMR; | |
583 | } | |
584 | ||
585 | int llc_conn_ev_busy_tmr_exp(struct sock *sk, struct sk_buff *skb) | |
586 | { | |
587 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
588 | ||
589 | return ev->type != LLC_CONN_EV_TYPE_BUSY_TMR; | |
590 | } | |
591 | ||
592 | int llc_conn_ev_init_p_f_cycle(struct sock *sk, struct sk_buff *skb) | |
593 | { | |
594 | return 1; | |
595 | } | |
596 | ||
597 | int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb) | |
598 | { | |
599 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
600 | ||
601 | return ev->type == LLC_CONN_EV_TYPE_SIMPLE && | |
602 | ev->prim_type == LLC_CONN_EV_TX_BUFF_FULL ? 0 : 1; | |
603 | } | |
604 | ||
605 | /* Event qualifier functions | |
606 | * | |
607 | * these functions simply verify the value of a state flag associated with | |
608 | * the connection and return either a 0 for success or a non-zero value | |
609 | * for not-success; verify the event is the type we expect | |
610 | */ | |
611 | int llc_conn_ev_qlfy_data_flag_eq_1(struct sock *sk, struct sk_buff *skb) | |
612 | { | |
613 | return llc_sk(sk)->data_flag != 1; | |
614 | } | |
615 | ||
616 | int llc_conn_ev_qlfy_data_flag_eq_0(struct sock *sk, struct sk_buff *skb) | |
617 | { | |
618 | return llc_sk(sk)->data_flag; | |
619 | } | |
620 | ||
621 | int llc_conn_ev_qlfy_data_flag_eq_2(struct sock *sk, struct sk_buff *skb) | |
622 | { | |
623 | return llc_sk(sk)->data_flag != 2; | |
624 | } | |
625 | ||
626 | int llc_conn_ev_qlfy_p_flag_eq_1(struct sock *sk, struct sk_buff *skb) | |
627 | { | |
628 | return llc_sk(sk)->p_flag != 1; | |
629 | } | |
630 | ||
631 | /** | |
632 | * conn_ev_qlfy_last_frame_eq_1 - checks if frame is last in tx window | |
633 | * @sk: current connection structure. | |
634 | * @skb: current event. | |
635 | * | |
636 | * This function determines when frame which is sent, is last frame of | |
637 | * transmit window, if it is then this function return zero else return | |
638 | * one. This function is used for sending last frame of transmit window | |
639 | * as I-format command with p-bit set to one. Returns 0 if frame is last | |
640 | * frame, 1 otherwise. | |
641 | */ | |
642 | int llc_conn_ev_qlfy_last_frame_eq_1(struct sock *sk, struct sk_buff *skb) | |
643 | { | |
644 | return !(skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k); | |
645 | } | |
646 | ||
647 | /** | |
648 | * conn_ev_qlfy_last_frame_eq_0 - checks if frame isn't last in tx window | |
649 | * @sk: current connection structure. | |
650 | * @skb: current event. | |
651 | * | |
652 | * This function determines when frame which is sent, isn't last frame of | |
653 | * transmit window, if it isn't then this function return zero else return | |
654 | * one. Returns 0 if frame isn't last frame, 1 otherwise. | |
655 | */ | |
656 | int llc_conn_ev_qlfy_last_frame_eq_0(struct sock *sk, struct sk_buff *skb) | |
657 | { | |
658 | return skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k; | |
659 | } | |
660 | ||
661 | int llc_conn_ev_qlfy_p_flag_eq_0(struct sock *sk, struct sk_buff *skb) | |
662 | { | |
663 | return llc_sk(sk)->p_flag; | |
664 | } | |
665 | ||
666 | int llc_conn_ev_qlfy_p_flag_eq_f(struct sock *sk, struct sk_buff *skb) | |
667 | { | |
668 | u8 f_bit; | |
669 | ||
670 | llc_pdu_decode_pf_bit(skb, &f_bit); | |
671 | return llc_sk(sk)->p_flag == f_bit ? 0 : 1; | |
672 | } | |
673 | ||
674 | int llc_conn_ev_qlfy_remote_busy_eq_0(struct sock *sk, struct sk_buff *skb) | |
675 | { | |
676 | return llc_sk(sk)->remote_busy_flag; | |
677 | } | |
678 | ||
679 | int llc_conn_ev_qlfy_remote_busy_eq_1(struct sock *sk, struct sk_buff *skb) | |
680 | { | |
681 | return !llc_sk(sk)->remote_busy_flag; | |
682 | } | |
683 | ||
684 | int llc_conn_ev_qlfy_retry_cnt_lt_n2(struct sock *sk, struct sk_buff *skb) | |
685 | { | |
686 | return !(llc_sk(sk)->retry_count < llc_sk(sk)->n2); | |
687 | } | |
688 | ||
689 | int llc_conn_ev_qlfy_retry_cnt_gte_n2(struct sock *sk, struct sk_buff *skb) | |
690 | { | |
691 | return !(llc_sk(sk)->retry_count >= llc_sk(sk)->n2); | |
692 | } | |
693 | ||
694 | int llc_conn_ev_qlfy_s_flag_eq_1(struct sock *sk, struct sk_buff *skb) | |
695 | { | |
696 | return !llc_sk(sk)->s_flag; | |
697 | } | |
698 | ||
699 | int llc_conn_ev_qlfy_s_flag_eq_0(struct sock *sk, struct sk_buff *skb) | |
700 | { | |
701 | return llc_sk(sk)->s_flag; | |
702 | } | |
703 | ||
704 | int llc_conn_ev_qlfy_cause_flag_eq_1(struct sock *sk, struct sk_buff *skb) | |
705 | { | |
706 | return !llc_sk(sk)->cause_flag; | |
707 | } | |
708 | ||
709 | int llc_conn_ev_qlfy_cause_flag_eq_0(struct sock *sk, struct sk_buff *skb) | |
710 | { | |
711 | return llc_sk(sk)->cause_flag; | |
712 | } | |
713 | ||
714 | int llc_conn_ev_qlfy_set_status_conn(struct sock *sk, struct sk_buff *skb) | |
715 | { | |
716 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
717 | ||
718 | ev->status = LLC_STATUS_CONN; | |
719 | return 0; | |
720 | } | |
721 | ||
722 | int llc_conn_ev_qlfy_set_status_disc(struct sock *sk, struct sk_buff *skb) | |
723 | { | |
724 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
725 | ||
726 | ev->status = LLC_STATUS_DISC; | |
727 | return 0; | |
728 | } | |
729 | ||
730 | int llc_conn_ev_qlfy_set_status_failed(struct sock *sk, struct sk_buff *skb) | |
731 | { | |
732 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
733 | ||
734 | ev->status = LLC_STATUS_FAILED; | |
735 | return 0; | |
736 | } | |
737 | ||
738 | int llc_conn_ev_qlfy_set_status_remote_busy(struct sock *sk, | |
739 | struct sk_buff *skb) | |
740 | { | |
741 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
742 | ||
743 | ev->status = LLC_STATUS_REMOTE_BUSY; | |
744 | return 0; | |
745 | } | |
746 | ||
747 | int llc_conn_ev_qlfy_set_status_refuse(struct sock *sk, struct sk_buff *skb) | |
748 | { | |
749 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
750 | ||
751 | ev->status = LLC_STATUS_REFUSE; | |
752 | return 0; | |
753 | } | |
754 | ||
755 | int llc_conn_ev_qlfy_set_status_conflict(struct sock *sk, struct sk_buff *skb) | |
756 | { | |
757 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
758 | ||
759 | ev->status = LLC_STATUS_CONFLICT; | |
760 | return 0; | |
761 | } | |
762 | ||
763 | int llc_conn_ev_qlfy_set_status_rst_done(struct sock *sk, struct sk_buff *skb) | |
764 | { | |
765 | struct llc_conn_state_ev *ev = llc_conn_ev(skb); | |
766 | ||
767 | ev->status = LLC_STATUS_RESET_DONE; | |
768 | return 0; | |
769 | } |