1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * X.25 Packet Layer release 002 2 * X.25 Packet Layer release 002
4 * 3 *
5 * This is ALPHA test software. This code 4 * This is ALPHA test software. This code may break your machine,
6 * randomly fail to work with new release 5 * randomly fail to work with new releases, misbehave and/or generally
7 * screw up. It might even work. 6 * screw up. It might even work.
8 * 7 *
9 * This code REQUIRES 2.1.15 or higher 8 * This code REQUIRES 2.1.15 or higher
10 * 9 *
>> 10 * This module:
>> 11 * This module is free software; you can redistribute it and/or
>> 12 * modify it under the terms of the GNU General Public License
>> 13 * as published by the Free Software Foundation; either version
>> 14 * 2 of the License, or (at your option) any later version.
>> 15 *
11 * History 16 * History
12 * X.25 001 Jonathan Naylor Star 17 * X.25 001 Jonathan Naylor Started coding.
13 * X.25 002 Jonathan Naylor Cent 18 * X.25 002 Jonathan Naylor Centralised disconnection code.
14 * New 19 * New timer architecture.
15 * 2000-03-20 Daniela Squassoni Disa 20 * 2000-03-20 Daniela Squassoni Disabling/enabling of facilities
16 * nego 21 * negotiation.
17 * 2000-11-10 Henner Eisen Chec 22 * 2000-11-10 Henner Eisen Check and reset for out-of-sequence
18 * i-fr 23 * i-frames.
19 */ 24 */
20 25
21 #define pr_fmt(fmt) "X25: " fmt <<
22 <<
23 #include <linux/slab.h> <<
24 #include <linux/errno.h> 26 #include <linux/errno.h>
25 #include <linux/kernel.h> 27 #include <linux/kernel.h>
26 #include <linux/string.h> 28 #include <linux/string.h>
27 #include <linux/skbuff.h> 29 #include <linux/skbuff.h>
28 #include <net/sock.h> 30 #include <net/sock.h>
29 #include <net/tcp_states.h> 31 #include <net/tcp_states.h>
30 #include <net/x25.h> 32 #include <net/x25.h>
31 33
32 static int x25_queue_rx_frame(struct sock *sk, 34 static int x25_queue_rx_frame(struct sock *sk, struct sk_buff *skb, int more)
33 { 35 {
34 struct sk_buff *skbo, *skbn = skb; 36 struct sk_buff *skbo, *skbn = skb;
35 struct x25_sock *x25 = x25_sk(sk); 37 struct x25_sock *x25 = x25_sk(sk);
36 38
37 if (more) { 39 if (more) {
38 x25->fraglen += skb->len; 40 x25->fraglen += skb->len;
39 skb_queue_tail(&x25->fragment_ 41 skb_queue_tail(&x25->fragment_queue, skb);
40 skb_set_owner_r(skb, sk); 42 skb_set_owner_r(skb, sk);
41 return 0; 43 return 0;
42 } 44 }
43 45
44 if (x25->fraglen > 0) { /* End of frag !! 46 if (!more && x25->fraglen > 0) { /* End of fragment */
45 int len = x25->fraglen + skb-> 47 int len = x25->fraglen + skb->len;
46 48
47 if ((skbn = alloc_skb(len, GFP 49 if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL){
48 kfree_skb(skb); 50 kfree_skb(skb);
49 return 1; 51 return 1;
50 } 52 }
51 53
52 skb_queue_tail(&x25->fragment_ 54 skb_queue_tail(&x25->fragment_queue, skb);
53 55
54 skb_reset_transport_header(skb 56 skb_reset_transport_header(skbn);
55 57
56 skbo = skb_dequeue(&x25->fragm 58 skbo = skb_dequeue(&x25->fragment_queue);
57 skb_copy_from_linear_data(skbo 59 skb_copy_from_linear_data(skbo, skb_put(skbn, skbo->len),
58 skbo 60 skbo->len);
59 kfree_skb(skbo); 61 kfree_skb(skbo);
60 62
61 while ((skbo = 63 while ((skbo =
62 skb_dequeue(&x25->frag 64 skb_dequeue(&x25->fragment_queue)) != NULL) {
63 skb_pull(skbo, (x25->n 65 skb_pull(skbo, (x25->neighbour->extended) ?
64 X25_EX 66 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
65 skb_copy_from_linear_d 67 skb_copy_from_linear_data(skbo,
66 68 skb_put(skbn, skbo->len),
67 69 skbo->len);
68 kfree_skb(skbo); 70 kfree_skb(skbo);
69 } 71 }
70 72
71 x25->fraglen = 0; 73 x25->fraglen = 0;
72 } 74 }
73 75
74 skb_set_owner_r(skbn, sk); 76 skb_set_owner_r(skbn, sk);
75 skb_queue_tail(&sk->sk_receive_queue, 77 skb_queue_tail(&sk->sk_receive_queue, skbn);
76 if (!sock_flag(sk, SOCK_DEAD)) 78 if (!sock_flag(sk, SOCK_DEAD))
77 sk->sk_data_ready(sk); !! 79 sk->sk_data_ready(sk, skbn->len);
78 80
79 return 0; 81 return 0;
80 } 82 }
81 83
82 /* 84 /*
83 * State machine for state 1, Awaiting Call Ac 85 * State machine for state 1, Awaiting Call Accepted State.
84 * The handling of the timer(s) is in file x25 86 * The handling of the timer(s) is in file x25_timer.c.
85 * Handling of state 0 and connection release 87 * Handling of state 0 and connection release is in af_x25.c.
86 */ 88 */
87 static int x25_state1_machine(struct sock *sk, 89 static int x25_state1_machine(struct sock *sk, struct sk_buff *skb, int frametype)
88 { 90 {
89 struct x25_address source_addr, dest_a 91 struct x25_address source_addr, dest_addr;
90 int len; 92 int len;
91 struct x25_sock *x25 = x25_sk(sk); <<
92 93
93 switch (frametype) { 94 switch (frametype) {
94 case X25_CALL_ACCEPTED: { !! 95 case X25_CALL_ACCEPTED: {
>> 96 struct x25_sock *x25 = x25_sk(sk);
>> 97
>> 98 x25_stop_timer(sk);
>> 99 x25->condition = 0x00;
>> 100 x25->vs = 0;
>> 101 x25->va = 0;
>> 102 x25->vr = 0;
>> 103 x25->vl = 0;
>> 104 x25->state = X25_STATE_3;
>> 105 sk->sk_state = TCP_ESTABLISHED;
>> 106 /*
>> 107 * Parse the data in the frame.
>> 108 */
>> 109 skb_pull(skb, X25_STD_MIN_LEN);
95 110
96 x25_stop_timer(sk); !! 111 len = x25_parse_address_block(skb, &source_addr,
97 x25->condition = 0x00; !! 112 &dest_addr);
98 x25->vs = 0; !! 113 if (len > 0)
99 x25->va = 0; !! 114 skb_pull(skb, len);
100 x25->vr = 0; !! 115
101 x25->vl = 0; !! 116 len = x25_parse_facilities(skb, &x25->facilities,
102 x25->state = X25_STATE_3; !! 117 &x25->dte_facilities,
103 sk->sk_state = TCP_ESTABLISH !! 118 &x25->vc_facil_mask);
104 /* !! 119 if (len > 0)
105 * Parse the data in the !! 120 skb_pull(skb, len);
106 */ !! 121 else
107 if (!pskb_may_pull(skb, X25_ST !! 122 return -1;
108 goto out_clear; !! 123 /*
109 skb_pull(skb, X25_STD_MIN_LEN) !! 124 * Copy any Call User Data.
110 !! 125 */
111 len = x25_parse_address_block( !! 126 if (skb->len >= 0) {
112 !! 127 skb_copy_from_linear_data(skb,
113 if (len > 0) !! 128 x25->calluserdata.cuddata,
114 skb_pull(skb, len); !! 129 skb->len);
115 else if (len < 0) !! 130 x25->calluserdata.cudlength = skb->len;
116 goto out_clear; !! 131 }
117 !! 132 if (!sock_flag(sk, SOCK_DEAD))
118 len = x25_parse_facilities(skb !! 133 sk->sk_state_change(sk);
119 &x2 !! 134 break;
120 &x2 <<
121 if (len > 0) <<
122 skb_pull(skb, len); <<
123 else if (len < 0) <<
124 goto out_clear; <<
125 /* <<
126 * Copy any Call User Dat <<
127 */ <<
128 if (skb->len > 0) { <<
129 if (skb->len > X25_MAX <<
130 goto out_clear <<
131 <<
132 skb_copy_bits(skb, 0, <<
133 skb->len); <<
134 x25->calluserdata.cudl <<
135 } 135 }
136 if (!sock_flag(sk, SOCK_DEAD)) !! 136 case X25_CLEAR_REQUEST:
137 sk->sk_state_change(sk !! 137 x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
138 break; !! 138 x25_disconnect(sk, ECONNREFUSED, skb->data[3], skb->data[4]);
139 } !! 139 break;
140 case X25_CALL_REQUEST: <<
141 /* call collision */ <<
142 x25->causediag.cause = 0x <<
143 x25->causediag.diagnostic = 0x <<
144 <<
145 x25_write_internal(sk, X25_CLE <<
146 x25_disconnect(sk, EISCONN, 0x <<
147 break; <<
148 <<
149 case X25_CLEAR_REQUEST: <<
150 if (!pskb_may_pull(skb, X25_ST <<
151 goto out_clear; <<
152 <<
153 x25_write_internal(sk, X25_CLE <<
154 x25_disconnect(sk, ECONNREFUSE <<
155 break; <<
156 140
157 default: !! 141 default:
158 break; !! 142 break;
159 } 143 }
160 144
161 return 0; 145 return 0;
162 <<
163 out_clear: <<
164 x25_write_internal(sk, X25_CLEAR_REQUE <<
165 x25->state = X25_STATE_2; <<
166 x25_start_t23timer(sk); <<
167 return 0; <<
168 } 146 }
169 147
170 /* 148 /*
171 * State machine for state 2, Awaiting Clear C 149 * State machine for state 2, Awaiting Clear Confirmation State.
172 * The handling of the timer(s) is in file x25 150 * The handling of the timer(s) is in file x25_timer.c
173 * Handling of state 0 and connection release 151 * Handling of state 0 and connection release is in af_x25.c.
174 */ 152 */
175 static int x25_state2_machine(struct sock *sk, 153 static int x25_state2_machine(struct sock *sk, struct sk_buff *skb, int frametype)
176 { 154 {
177 switch (frametype) { 155 switch (frametype) {
178 156
179 case X25_CLEAR_REQUEST: 157 case X25_CLEAR_REQUEST:
180 if (!pskb_may_pull(skb <<
181 goto out_clear <<
182 <<
183 x25_write_internal(sk, 158 x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
184 x25_disconnect(sk, 0, 159 x25_disconnect(sk, 0, skb->data[3], skb->data[4]);
185 break; 160 break;
186 161
187 case X25_CLEAR_CONFIRMATION: 162 case X25_CLEAR_CONFIRMATION:
188 x25_disconnect(sk, 0, 163 x25_disconnect(sk, 0, 0, 0);
189 break; 164 break;
190 165
191 default: 166 default:
192 break; 167 break;
193 } 168 }
194 169
195 return 0; 170 return 0;
196 <<
197 out_clear: <<
198 x25_write_internal(sk, X25_CLEAR_REQUE <<
199 x25_start_t23timer(sk); <<
200 return 0; <<
201 } 171 }
202 172
203 /* 173 /*
204 * State machine for state 3, Connected State. 174 * State machine for state 3, Connected State.
205 * The handling of the timer(s) is in file x25 175 * The handling of the timer(s) is in file x25_timer.c
206 * Handling of state 0 and connection release 176 * Handling of state 0 and connection release is in af_x25.c.
207 */ 177 */
208 static int x25_state3_machine(struct sock *sk, 178 static int x25_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype, int ns, int nr, int q, int d, int m)
209 { 179 {
210 int queued = 0; 180 int queued = 0;
211 int modulus; 181 int modulus;
212 struct x25_sock *x25 = x25_sk(sk); 182 struct x25_sock *x25 = x25_sk(sk);
213 183
214 modulus = (x25->neighbour->extended) ? 184 modulus = (x25->neighbour->extended) ? X25_EMODULUS : X25_SMODULUS;
215 185
216 switch (frametype) { 186 switch (frametype) {
217 187
218 case X25_RESET_REQUEST: 188 case X25_RESET_REQUEST:
219 x25_write_internal(sk, 189 x25_write_internal(sk, X25_RESET_CONFIRMATION);
220 x25_stop_timer(sk); 190 x25_stop_timer(sk);
221 x25->condition = 0x00; 191 x25->condition = 0x00;
222 x25->vs = 0; 192 x25->vs = 0;
223 x25->vr = 0; 193 x25->vr = 0;
224 x25->va = 0; 194 x25->va = 0;
225 x25->vl = 0; 195 x25->vl = 0;
226 x25_requeue_frames(sk) 196 x25_requeue_frames(sk);
227 break; 197 break;
228 198
229 case X25_CLEAR_REQUEST: 199 case X25_CLEAR_REQUEST:
230 if (!pskb_may_pull(skb <<
231 goto out_clear <<
232 <<
233 x25_write_internal(sk, 200 x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
234 x25_disconnect(sk, 0, 201 x25_disconnect(sk, 0, skb->data[3], skb->data[4]);
235 break; 202 break;
236 203
237 case X25_RR: 204 case X25_RR:
238 case X25_RNR: 205 case X25_RNR:
239 if (!x25_validate_nr(s 206 if (!x25_validate_nr(sk, nr)) {
240 x25_clear_queu 207 x25_clear_queues(sk);
241 x25_write_inte 208 x25_write_internal(sk, X25_RESET_REQUEST);
242 x25_start_t22t 209 x25_start_t22timer(sk);
243 x25->condition 210 x25->condition = 0x00;
244 x25->vs 211 x25->vs = 0;
245 x25->vr 212 x25->vr = 0;
246 x25->va 213 x25->va = 0;
247 x25->vl 214 x25->vl = 0;
248 x25->state 215 x25->state = X25_STATE_4;
249 } else { 216 } else {
250 x25_frames_ack 217 x25_frames_acked(sk, nr);
251 if (frametype 218 if (frametype == X25_RNR) {
252 x25->c 219 x25->condition |= X25_COND_PEER_RX_BUSY;
253 } else { 220 } else {
254 x25->c 221 x25->condition &= ~X25_COND_PEER_RX_BUSY;
255 } 222 }
256 } 223 }
257 break; 224 break;
258 225
259 case X25_DATA: /* XXX */ 226 case X25_DATA: /* XXX */
260 x25->condition &= ~X25 227 x25->condition &= ~X25_COND_PEER_RX_BUSY;
261 if ((ns != x25->vr) || 228 if ((ns != x25->vr) || !x25_validate_nr(sk, nr)) {
262 x25_clear_queu 229 x25_clear_queues(sk);
263 x25_write_inte 230 x25_write_internal(sk, X25_RESET_REQUEST);
264 x25_start_t22t 231 x25_start_t22timer(sk);
265 x25->condition 232 x25->condition = 0x00;
266 x25->vs 233 x25->vs = 0;
267 x25->vr 234 x25->vr = 0;
268 x25->va 235 x25->va = 0;
269 x25->vl 236 x25->vl = 0;
270 x25->state 237 x25->state = X25_STATE_4;
271 break; 238 break;
272 } 239 }
273 x25_frames_acked(sk, n 240 x25_frames_acked(sk, nr);
274 if (ns == x25->vr) { 241 if (ns == x25->vr) {
275 if (x25_queue_ 242 if (x25_queue_rx_frame(sk, skb, m) == 0) {
276 x25->v 243 x25->vr = (x25->vr + 1) % modulus;
277 queued 244 queued = 1;
278 } else { 245 } else {
279 /* Sho 246 /* Should never happen */
280 x25_cl 247 x25_clear_queues(sk);
281 x25_wr 248 x25_write_internal(sk, X25_RESET_REQUEST);
282 x25_st 249 x25_start_t22timer(sk);
283 x25->c 250 x25->condition = 0x00;
284 x25->v 251 x25->vs = 0;
285 x25->v 252 x25->vr = 0;
286 x25->v 253 x25->va = 0;
287 x25->v 254 x25->vl = 0;
288 x25->s 255 x25->state = X25_STATE_4;
289 break; 256 break;
290 } 257 }
291 if (atomic_rea 258 if (atomic_read(&sk->sk_rmem_alloc) >
292 (sk->sk_rc 259 (sk->sk_rcvbuf >> 1))
293 x25->c 260 x25->condition |= X25_COND_OWN_RX_BUSY;
294 } 261 }
295 /* 262 /*
296 * If the window 263 * If the window is full Ack it immediately, else
297 * start the hold 264 * start the holdback timer.
298 */ 265 */
299 if (((x25->vl + x25->f 266 if (((x25->vl + x25->facilities.winsize_in) % modulus) == x25->vr) {
300 x25->condition 267 x25->condition &= ~X25_COND_ACK_PENDING;
301 x25_stop_timer 268 x25_stop_timer(sk);
302 x25_enquiry_re 269 x25_enquiry_response(sk);
303 } else { 270 } else {
304 x25->condition 271 x25->condition |= X25_COND_ACK_PENDING;
305 x25_start_t2ti 272 x25_start_t2timer(sk);
306 } 273 }
307 break; 274 break;
308 275
309 case X25_INTERRUPT_CONFIRMATIO 276 case X25_INTERRUPT_CONFIRMATION:
310 clear_bit(X25_INTERRUP !! 277 x25->intflag = 0;
311 break; 278 break;
312 279
313 case X25_INTERRUPT: 280 case X25_INTERRUPT:
314 if (sock_flag(sk, SOCK 281 if (sock_flag(sk, SOCK_URGINLINE))
315 queued = !sock 282 queued = !sock_queue_rcv_skb(sk, skb);
316 else { 283 else {
317 skb_set_owner_ 284 skb_set_owner_r(skb, sk);
318 skb_queue_tail 285 skb_queue_tail(&x25->interrupt_in_queue, skb);
319 queued = 1; 286 queued = 1;
320 } 287 }
321 sk_send_sigurg(sk); 288 sk_send_sigurg(sk);
322 x25_write_internal(sk, 289 x25_write_internal(sk, X25_INTERRUPT_CONFIRMATION);
323 break; 290 break;
324 291
325 default: 292 default:
326 pr_warn("unknown %02X !! 293 printk(KERN_WARNING "x25: unknown %02X in state 3\n", frametype);
327 break; 294 break;
328 } 295 }
329 296
330 return queued; 297 return queued;
331 <<
332 out_clear: <<
333 x25_write_internal(sk, X25_CLEAR_REQUE <<
334 x25->state = X25_STATE_2; <<
335 x25_start_t23timer(sk); <<
336 return 0; <<
337 } 298 }
338 299
339 /* 300 /*
340 * State machine for state 4, Awaiting Reset C 301 * State machine for state 4, Awaiting Reset Confirmation State.
341 * The handling of the timer(s) is in file x25 302 * The handling of the timer(s) is in file x25_timer.c
342 * Handling of state 0 and connection release 303 * Handling of state 0 and connection release is in af_x25.c.
343 */ 304 */
344 static int x25_state4_machine(struct sock *sk, 305 static int x25_state4_machine(struct sock *sk, struct sk_buff *skb, int frametype)
345 { 306 {
346 struct x25_sock *x25 = x25_sk(sk); <<
347 <<
348 switch (frametype) { 307 switch (frametype) {
349 308
350 case X25_RESET_REQUEST: 309 case X25_RESET_REQUEST:
351 x25_write_internal(sk, 310 x25_write_internal(sk, X25_RESET_CONFIRMATION);
352 fallthrough; <<
353 case X25_RESET_CONFIRMATION: { 311 case X25_RESET_CONFIRMATION: {
>> 312 struct x25_sock *x25 = x25_sk(sk);
>> 313
354 x25_stop_timer(sk); 314 x25_stop_timer(sk);
355 x25->condition = 0x00; 315 x25->condition = 0x00;
356 x25->va = 0; 316 x25->va = 0;
357 x25->vr = 0; 317 x25->vr = 0;
358 x25->vs = 0; 318 x25->vs = 0;
359 x25->vl = 0; 319 x25->vl = 0;
360 x25->state = X25_S 320 x25->state = X25_STATE_3;
361 x25_requeue_frames(sk) 321 x25_requeue_frames(sk);
362 break; 322 break;
363 } 323 }
364 case X25_CLEAR_REQUEST: 324 case X25_CLEAR_REQUEST:
365 if (!pskb_may_pull(skb <<
366 goto out_clear <<
367 <<
368 x25_write_internal(sk, <<
369 x25_disconnect(sk, 0, <<
370 break; <<
371 <<
372 default: <<
373 break; <<
374 } <<
375 <<
376 return 0; <<
377 <<
378 out_clear: <<
379 x25_write_internal(sk, X25_CLEAR_REQUE <<
380 x25->state = X25_STATE_2; <<
381 x25_start_t23timer(sk); <<
382 return 0; <<
383 } <<
384 <<
385 /* <<
386 * State machine for state 5, Call Accepted / <<
387 * The handling of the timer(s) is in file x25 <<
388 * Handling of state 0 and connection release <<
389 */ <<
390 static int x25_state5_machine(struct sock *sk, <<
391 { <<
392 struct x25_sock *x25 = x25_sk(sk); <<
393 <<
394 switch (frametype) { <<
395 case X25_CLEAR_REQUEST: <<
396 if (!pskb_may_pull(skb <<
397 x25_write_inte <<
398 x25->state = X <<
399 x25_start_t23t <<
400 return 0; <<
401 } <<
402 <<
403 x25_write_internal(sk, 325 x25_write_internal(sk, X25_CLEAR_CONFIRMATION);
404 x25_disconnect(sk, 0, 326 x25_disconnect(sk, 0, skb->data[3], skb->data[4]);
405 break; 327 break;
406 328
407 default: 329 default:
408 break; 330 break;
409 } 331 }
410 332
411 return 0; 333 return 0;
412 } 334 }
413 335
414 /* Higher level upcall for a LAPB frame */ 336 /* Higher level upcall for a LAPB frame */
415 int x25_process_rx_frame(struct sock *sk, stru 337 int x25_process_rx_frame(struct sock *sk, struct sk_buff *skb)
416 { 338 {
417 struct x25_sock *x25 = x25_sk(sk); 339 struct x25_sock *x25 = x25_sk(sk);
418 int queued = 0, frametype, ns, nr, q, 340 int queued = 0, frametype, ns, nr, q, d, m;
419 341
420 if (x25->state == X25_STATE_0) 342 if (x25->state == X25_STATE_0)
421 return 0; 343 return 0;
422 344
423 frametype = x25_decode(sk, skb, &ns, & 345 frametype = x25_decode(sk, skb, &ns, &nr, &q, &d, &m);
424 346
425 switch (x25->state) { 347 switch (x25->state) {
426 case X25_STATE_1: !! 348 case X25_STATE_1:
427 queued = x25_state1_machine(sk !! 349 queued = x25_state1_machine(sk, skb, frametype);
428 break; !! 350 break;
429 case X25_STATE_2: !! 351 case X25_STATE_2:
430 queued = x25_state2_machine(sk !! 352 queued = x25_state2_machine(sk, skb, frametype);
431 break; !! 353 break;
432 case X25_STATE_3: !! 354 case X25_STATE_3:
433 queued = x25_state3_machine(sk !! 355 queued = x25_state3_machine(sk, skb, frametype, ns, nr, q, d, m);
434 break; !! 356 break;
435 case X25_STATE_4: !! 357 case X25_STATE_4:
436 queued = x25_state4_machine(sk !! 358 queued = x25_state4_machine(sk, skb, frametype);
437 break; !! 359 break;
438 case X25_STATE_5: <<
439 queued = x25_state5_machine(sk <<
440 break; <<
441 } 360 }
442 361
443 x25_kick(sk); 362 x25_kick(sk);
444 363
445 return queued; 364 return queued;
446 } 365 }
447 366
448 int x25_backlog_rcv(struct sock *sk, struct sk 367 int x25_backlog_rcv(struct sock *sk, struct sk_buff *skb)
449 { 368 {
450 int queued = x25_process_rx_frame(sk, 369 int queued = x25_process_rx_frame(sk, skb);
451 370
452 if (!queued) 371 if (!queued)
453 kfree_skb(skb); 372 kfree_skb(skb);
454 373
455 return 0; 374 return 0;
456 } 375 }
457 376
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