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Commit | Line | Data |
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7c657876 ACM |
1 | /* |
2 | * net/dccp/options.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
1bc09869 IM |
5 | * Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> |
6 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | |
7 | * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz> | |
7c657876 ACM |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | #include <linux/config.h> | |
15 | #include <linux/dccp.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/skbuff.h> | |
20 | ||
ae31c339 | 21 | #include "ackvec.h" |
7c657876 ACM |
22 | #include "ccid.h" |
23 | #include "dccp.h" | |
afe00251 | 24 | #include "feat.h" |
7c657876 | 25 | |
e55d912f ACM |
26 | int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; |
27 | int dccp_feat_default_rx_ccid = DCCPF_INITIAL_CCID; | |
28 | int dccp_feat_default_tx_ccid = DCCPF_INITIAL_CCID; | |
29 | int dccp_feat_default_ack_ratio = DCCPF_INITIAL_ACK_RATIO; | |
30 | int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; | |
31 | int dccp_feat_default_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; | |
7c657876 ACM |
32 | |
33 | void dccp_options_init(struct dccp_options *dccpo) | |
34 | { | |
e55d912f ACM |
35 | dccpo->dccpo_sequence_window = dccp_feat_default_sequence_window; |
36 | dccpo->dccpo_rx_ccid = dccp_feat_default_rx_ccid; | |
37 | dccpo->dccpo_tx_ccid = dccp_feat_default_tx_ccid; | |
38 | dccpo->dccpo_ack_ratio = dccp_feat_default_ack_ratio; | |
39 | dccpo->dccpo_send_ack_vector = dccp_feat_default_send_ack_vector; | |
40 | dccpo->dccpo_send_ndp_count = dccp_feat_default_send_ndp_count; | |
7c657876 ACM |
41 | } |
42 | ||
43 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) | |
44 | { | |
45 | u32 value = 0; | |
46 | ||
47 | if (len > 3) | |
48 | value += *bf++ << 24; | |
49 | if (len > 2) | |
50 | value += *bf++ << 16; | |
51 | if (len > 1) | |
52 | value += *bf++ << 8; | |
53 | if (len > 0) | |
54 | value += *bf; | |
55 | ||
56 | return value; | |
57 | } | |
58 | ||
59 | int dccp_parse_options(struct sock *sk, struct sk_buff *skb) | |
60 | { | |
61 | struct dccp_sock *dp = dccp_sk(sk); | |
725ba8ee | 62 | #ifdef CONFIG_IP_DCCP_DEBUG |
7690af3f ACM |
63 | const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? |
64 | "CLIENT rx opt: " : "server rx opt: "; | |
7c657876 ACM |
65 | #endif |
66 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
67 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; | |
68 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); | |
69 | unsigned char *opt_ptr = options; | |
7690af3f ACM |
70 | const unsigned char *opt_end = (unsigned char *)dh + |
71 | (dh->dccph_doff * 4); | |
7c657876 ACM |
72 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
73 | unsigned char opt, len; | |
74 | unsigned char *value; | |
1c14ac0a | 75 | u32 elapsed_time; |
afe00251 AB |
76 | int rc; |
77 | int mandatory = 0; | |
7c657876 ACM |
78 | |
79 | memset(opt_recv, 0, sizeof(*opt_recv)); | |
80 | ||
81 | while (opt_ptr != opt_end) { | |
82 | opt = *opt_ptr++; | |
83 | len = 0; | |
84 | value = NULL; | |
85 | ||
86 | /* Check if this isn't a single byte option */ | |
87 | if (opt > DCCPO_MAX_RESERVED) { | |
88 | if (opt_ptr == opt_end) | |
89 | goto out_invalid_option; | |
90 | ||
91 | len = *opt_ptr++; | |
92 | if (len < 3) | |
93 | goto out_invalid_option; | |
94 | /* | |
95 | * Remove the type and len fields, leaving | |
96 | * just the value size | |
97 | */ | |
98 | len -= 2; | |
99 | value = opt_ptr; | |
100 | opt_ptr += len; | |
101 | ||
102 | if (opt_ptr > opt_end) | |
103 | goto out_invalid_option; | |
104 | } | |
105 | ||
106 | switch (opt) { | |
107 | case DCCPO_PADDING: | |
108 | break; | |
afe00251 AB |
109 | case DCCPO_MANDATORY: |
110 | if (mandatory) | |
111 | goto out_invalid_option; | |
112 | mandatory = 1; | |
113 | break; | |
7c657876 ACM |
114 | case DCCPO_NDP_COUNT: |
115 | if (len > 3) | |
116 | goto out_invalid_option; | |
117 | ||
118 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
7690af3f ACM |
119 | dccp_pr_debug("%sNDP count=%d\n", debug_prefix, |
120 | opt_recv->dccpor_ndp); | |
7c657876 | 121 | break; |
afe00251 AB |
122 | case DCCPO_CHANGE_L: |
123 | /* fall through */ | |
124 | case DCCPO_CHANGE_R: | |
125 | if (len < 2) | |
126 | goto out_invalid_option; | |
127 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
128 | len - 1); | |
129 | /* | |
130 | * When there is a change error, change_recv is | |
131 | * responsible for dealing with it. i.e. reply with an | |
132 | * empty confirm. | |
133 | * If the change was mandatory, then we need to die. | |
134 | */ | |
135 | if (rc && mandatory) | |
136 | goto out_invalid_option; | |
137 | break; | |
138 | case DCCPO_CONFIRM_L: | |
139 | /* fall through */ | |
140 | case DCCPO_CONFIRM_R: | |
141 | if (len < 2) | |
142 | goto out_invalid_option; | |
143 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
144 | value + 1, len - 1)) | |
145 | goto out_invalid_option; | |
146 | break; | |
7c657876 | 147 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 148 | case DCCPO_ACK_VECTOR_1: |
7c657876 ACM |
149 | if (pkt_type == DCCP_PKT_DATA) |
150 | continue; | |
151 | ||
ae31c339 ACM |
152 | if (dp->dccps_options.dccpo_send_ack_vector && |
153 | dccp_ackvec_parse(sk, skb, opt, value, len)) | |
154 | goto out_invalid_option; | |
7c657876 ACM |
155 | break; |
156 | case DCCPO_TIMESTAMP: | |
157 | if (len != 4) | |
158 | goto out_invalid_option; | |
159 | ||
60fe62e7 | 160 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
7c657876 ACM |
161 | |
162 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
b0e56780 | 163 | dccp_timestamp(sk, &dp->dccps_timestamp_time); |
7c657876 ACM |
164 | |
165 | dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n", | |
166 | debug_prefix, opt_recv->dccpor_timestamp, | |
f6ccf554 | 167 | (unsigned long long) |
7c657876 ACM |
168 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
169 | break; | |
170 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 171 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
172 | goto out_invalid_option; |
173 | ||
60fe62e7 | 174 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
7c657876 | 175 | |
1bc09869 | 176 | dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ", |
7690af3f ACM |
177 | debug_prefix, |
178 | opt_recv->dccpor_timestamp_echo, | |
f6ccf554 DM |
179 | len + 2, |
180 | (unsigned long long) | |
1bc09869 IM |
181 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
182 | ||
1bc09869 | 183 | |
1c14ac0a ACM |
184 | if (len == 4) |
185 | break; | |
186 | ||
187 | if (len == 6) | |
60fe62e7 | 188 | elapsed_time = ntohs(*(__be16 *)(value + 4)); |
1c14ac0a | 189 | else |
60fe62e7 | 190 | elapsed_time = ntohl(*(__be32 *)(value + 4)); |
1c14ac0a ACM |
191 | |
192 | /* Give precedence to the biggest ELAPSED_TIME */ | |
193 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
194 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
7c657876 ACM |
195 | break; |
196 | case DCCPO_ELAPSED_TIME: | |
1bc09869 | 197 | if (len != 2 && len != 4) |
7c657876 ACM |
198 | goto out_invalid_option; |
199 | ||
200 | if (pkt_type == DCCP_PKT_DATA) | |
201 | continue; | |
1bc09869 IM |
202 | |
203 | if (len == 2) | |
60fe62e7 | 204 | elapsed_time = ntohs(*(__be16 *)value); |
1bc09869 | 205 | else |
60fe62e7 | 206 | elapsed_time = ntohl(*(__be32 *)value); |
1c14ac0a ACM |
207 | |
208 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
209 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 210 | |
7c657876 | 211 | dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix, |
1c14ac0a | 212 | elapsed_time); |
7c657876 ACM |
213 | break; |
214 | /* | |
215 | * From draft-ietf-dccp-spec-11.txt: | |
216 | * | |
7690af3f ACM |
217 | * Option numbers 128 through 191 are for |
218 | * options sent from the HC-Sender to the | |
219 | * HC-Receiver; option numbers 192 through 255 | |
220 | * are for options sent from the HC-Receiver to | |
221 | * the HC-Sender. | |
7c657876 ACM |
222 | */ |
223 | case 128 ... 191: { | |
224 | const u16 idx = value - options; | |
225 | ||
7690af3f ACM |
226 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
227 | opt, len, idx, | |
228 | value) != 0) | |
7c657876 ACM |
229 | goto out_invalid_option; |
230 | } | |
231 | break; | |
232 | case 192 ... 255: { | |
233 | const u16 idx = value - options; | |
234 | ||
7690af3f ACM |
235 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
236 | opt, len, idx, | |
237 | value) != 0) | |
7c657876 ACM |
238 | goto out_invalid_option; |
239 | } | |
240 | break; | |
241 | default: | |
7690af3f ACM |
242 | pr_info("DCCP(%p): option %d(len=%d) not " |
243 | "implemented, ignoring\n", | |
7c657876 ACM |
244 | sk, opt, len); |
245 | break; | |
246 | } | |
afe00251 AB |
247 | |
248 | if (opt != DCCPO_MANDATORY) | |
249 | mandatory = 0; | |
7c657876 ACM |
250 | } |
251 | ||
252 | return 0; | |
253 | ||
254 | out_invalid_option: | |
255 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); | |
256 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; | |
257 | pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); | |
258 | return -1; | |
259 | } | |
260 | ||
261 | static void dccp_encode_value_var(const u32 value, unsigned char *to, | |
262 | const unsigned int len) | |
263 | { | |
264 | if (len > 3) | |
265 | *to++ = (value & 0xFF000000) >> 24; | |
266 | if (len > 2) | |
267 | *to++ = (value & 0xFF0000) >> 16; | |
268 | if (len > 1) | |
269 | *to++ = (value & 0xFF00) >> 8; | |
270 | if (len > 0) | |
271 | *to++ = (value & 0xFF); | |
272 | } | |
273 | ||
274 | static inline int dccp_ndp_len(const int ndp) | |
275 | { | |
276 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; | |
277 | } | |
278 | ||
279 | void dccp_insert_option(struct sock *sk, struct sk_buff *skb, | |
280 | const unsigned char option, | |
281 | const void *value, const unsigned char len) | |
282 | { | |
283 | unsigned char *to; | |
284 | ||
285 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) { | |
7690af3f ACM |
286 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert " |
287 | "%d option!\n", option); | |
7c657876 ACM |
288 | return; |
289 | } | |
290 | ||
291 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; | |
292 | ||
293 | to = skb_push(skb, len + 2); | |
294 | *to++ = option; | |
295 | *to++ = len + 2; | |
296 | ||
297 | memcpy(to, value, len); | |
298 | } | |
299 | ||
300 | EXPORT_SYMBOL_GPL(dccp_insert_option); | |
301 | ||
302 | static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) | |
303 | { | |
304 | struct dccp_sock *dp = dccp_sk(sk); | |
305 | int ndp = dp->dccps_ndp_count; | |
306 | ||
307 | if (dccp_non_data_packet(skb)) | |
308 | ++dp->dccps_ndp_count; | |
309 | else | |
310 | dp->dccps_ndp_count = 0; | |
311 | ||
312 | if (ndp > 0) { | |
313 | unsigned char *ptr; | |
314 | const int ndp_len = dccp_ndp_len(ndp); | |
315 | const int len = ndp_len + 2; | |
316 | ||
317 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) | |
318 | return; | |
319 | ||
320 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
321 | ||
322 | ptr = skb_push(skb, len); | |
323 | *ptr++ = DCCPO_NDP_COUNT; | |
324 | *ptr++ = len; | |
325 | dccp_encode_value_var(ndp, ptr, ndp_len); | |
326 | } | |
327 | } | |
328 | ||
329 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) | |
330 | { | |
b1c9fe7b | 331 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
7c657876 ACM |
332 | } |
333 | ||
334 | void dccp_insert_option_elapsed_time(struct sock *sk, | |
335 | struct sk_buff *skb, | |
336 | u32 elapsed_time) | |
337 | { | |
725ba8ee | 338 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 339 | struct dccp_sock *dp = dccp_sk(sk); |
7690af3f ACM |
340 | const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? |
341 | "CLIENT TX opt: " : "server TX opt: "; | |
7c657876 ACM |
342 | #endif |
343 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); | |
344 | const int len = 2 + elapsed_time_len; | |
345 | unsigned char *to; | |
346 | ||
1bc09869 | 347 | if (elapsed_time_len == 0) |
7c657876 ACM |
348 | return; |
349 | ||
350 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) { | |
7690af3f ACM |
351 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to " |
352 | "insert elapsed time!\n"); | |
7c657876 ACM |
353 | return; |
354 | } | |
355 | ||
356 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
357 | ||
358 | to = skb_push(skb, len); | |
359 | *to++ = DCCPO_ELAPSED_TIME; | |
360 | *to++ = len; | |
361 | ||
1bc09869 | 362 | if (elapsed_time_len == 2) { |
60fe62e7 | 363 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
364 | memcpy(to, &var16, 2); |
365 | } else { | |
60fe62e7 | 366 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
367 | memcpy(to, &var32, 4); |
368 | } | |
7c657876 ACM |
369 | |
370 | dccp_pr_debug("%sELAPSED_TIME=%u, len=%d, seqno=%llu\n", | |
371 | debug_prefix, elapsed_time, | |
f6ccf554 DM |
372 | len, |
373 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); | |
7c657876 ACM |
374 | } |
375 | ||
d4b81ff7 | 376 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
7c657876 | 377 | |
b0e56780 ACM |
378 | void dccp_timestamp(const struct sock *sk, struct timeval *tv) |
379 | { | |
380 | const struct dccp_sock *dp = dccp_sk(sk); | |
381 | ||
382 | do_gettimeofday(tv); | |
383 | tv->tv_sec -= dp->dccps_epoch.tv_sec; | |
384 | tv->tv_usec -= dp->dccps_epoch.tv_usec; | |
385 | ||
386 | while (tv->tv_usec < 0) { | |
387 | tv->tv_sec--; | |
388 | tv->tv_usec += USEC_PER_SEC; | |
389 | } | |
390 | } | |
391 | ||
392 | EXPORT_SYMBOL_GPL(dccp_timestamp); | |
393 | ||
d4b81ff7 | 394 | void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 395 | { |
1bc09869 | 396 | struct timeval tv; |
60fe62e7 | 397 | __be32 now; |
afe00251 | 398 | |
b0e56780 | 399 | dccp_timestamp(sk, &tv); |
60fe62e7 | 400 | now = htonl(timeval_usecs(&tv) / 10); |
1bc09869 IM |
401 | /* yes this will overflow but that is the point as we want a |
402 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
403 | ||
7c657876 ACM |
404 | dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
405 | } | |
406 | ||
d4b81ff7 ACM |
407 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
408 | ||
7690af3f ACM |
409 | static void dccp_insert_option_timestamp_echo(struct sock *sk, |
410 | struct sk_buff *skb) | |
7c657876 ACM |
411 | { |
412 | struct dccp_sock *dp = dccp_sk(sk); | |
725ba8ee | 413 | #ifdef CONFIG_IP_DCCP_DEBUG |
7690af3f ACM |
414 | const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? |
415 | "CLIENT TX opt: " : "server TX opt: "; | |
7c657876 | 416 | #endif |
b0e56780 | 417 | struct timeval now; |
60fe62e7 | 418 | __be32 tstamp_echo; |
b0e56780 ACM |
419 | u32 elapsed_time; |
420 | int len, elapsed_time_len; | |
7c657876 ACM |
421 | unsigned char *to; |
422 | ||
b0e56780 ACM |
423 | dccp_timestamp(sk, &now); |
424 | elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; | |
425 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); | |
426 | len = 6 + elapsed_time_len; | |
427 | ||
7c657876 | 428 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) { |
7690af3f ACM |
429 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert " |
430 | "timestamp echo!\n"); | |
7c657876 ACM |
431 | return; |
432 | } | |
433 | ||
434 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
435 | ||
436 | to = skb_push(skb, len); | |
437 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
438 | *to++ = len; | |
439 | ||
440 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
441 | memcpy(to, &tstamp_echo, 4); | |
442 | to += 4; | |
afe00251 | 443 | |
1bc09869 | 444 | if (elapsed_time_len == 2) { |
60fe62e7 | 445 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
446 | memcpy(to, &var16, 2); |
447 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 448 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
449 | memcpy(to, &var32, 4); |
450 | } | |
7c657876 ACM |
451 | |
452 | dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, seqno=%llu\n", | |
453 | debug_prefix, dp->dccps_timestamp_echo, | |
f6ccf554 DM |
454 | len, |
455 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); | |
7c657876 ACM |
456 | |
457 | dp->dccps_timestamp_echo = 0; | |
1bc09869 IM |
458 | dp->dccps_timestamp_time.tv_sec = 0; |
459 | dp->dccps_timestamp_time.tv_usec = 0; | |
7c657876 ACM |
460 | } |
461 | ||
afe00251 AB |
462 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
463 | u8 *val, u8 len) | |
464 | { | |
465 | u8 *to; | |
466 | ||
467 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
468 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" | |
469 | " to insert feature %d option!\n", feat); | |
470 | return -1; | |
471 | } | |
472 | ||
473 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
474 | ||
475 | to = skb_push(skb, len + 3); | |
476 | *to++ = type; | |
477 | *to++ = len + 3; | |
478 | *to++ = feat; | |
479 | ||
480 | if (len) | |
481 | memcpy(to, val, len); | |
482 | dccp_pr_debug("option %d feat %d len %d\n", type, feat, len); | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | static void dccp_insert_feat(struct sock *sk, struct sk_buff *skb) | |
488 | { | |
489 | struct dccp_sock *dp = dccp_sk(sk); | |
490 | struct dccp_opt_pend *opt, *next; | |
491 | int change = 0; | |
492 | ||
493 | /* confirm any options [NN opts] */ | |
494 | list_for_each_entry_safe(opt, next, &dp->dccps_options.dccpo_conf, | |
495 | dccpop_node) { | |
496 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
497 | opt->dccpop_feat, opt->dccpop_val, | |
498 | opt->dccpop_len); | |
499 | /* fear empty confirms */ | |
500 | if (opt->dccpop_val) | |
501 | kfree(opt->dccpop_val); | |
502 | kfree(opt); | |
503 | } | |
504 | INIT_LIST_HEAD(&dp->dccps_options.dccpo_conf); | |
505 | ||
506 | /* see which features we need to send */ | |
507 | list_for_each_entry(opt, &dp->dccps_options.dccpo_pending, | |
508 | dccpop_node) { | |
509 | /* see if we need to send any confirm */ | |
510 | if (opt->dccpop_sc) { | |
511 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
512 | opt->dccpop_feat, | |
513 | opt->dccpop_sc->dccpoc_val, | |
514 | opt->dccpop_sc->dccpoc_len); | |
515 | ||
516 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
517 | kfree(opt->dccpop_sc->dccpoc_val); | |
518 | kfree(opt->dccpop_sc); | |
519 | opt->dccpop_sc = NULL; | |
520 | } | |
521 | ||
522 | /* any option not confirmed, re-send it */ | |
523 | if (!opt->dccpop_conf) { | |
524 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
525 | opt->dccpop_feat, opt->dccpop_val, | |
526 | opt->dccpop_len); | |
527 | change++; | |
528 | } | |
529 | } | |
530 | ||
531 | /* Retransmit timer. | |
532 | * If this is the master listening sock, we don't set a timer on it. It | |
533 | * should be fine because if the dude doesn't receive our RESPONSE | |
534 | * [which will contain the CHANGE] he will send another REQUEST which | |
535 | * will "retrnasmit" the change. | |
536 | */ | |
537 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
538 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
539 | ||
540 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
541 | * only when sending new stuff i guess. Currently the timer | |
542 | * never backs off because on re-transmission it just resets it! | |
543 | */ | |
544 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
545 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
546 | } | |
547 | } | |
548 | ||
7c657876 ACM |
549 | void dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
550 | { | |
551 | struct dccp_sock *dp = dccp_sk(sk); | |
552 | ||
553 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
554 | ||
555 | if (dp->dccps_options.dccpo_send_ndp_count) | |
556 | dccp_insert_option_ndp(sk, skb); | |
557 | ||
558 | if (!dccp_packet_without_ack(skb)) { | |
559 | if (dp->dccps_options.dccpo_send_ack_vector && | |
ae31c339 ACM |
560 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) |
561 | dccp_insert_option_ackvec(sk, skb); | |
7c657876 ACM |
562 | if (dp->dccps_timestamp_echo != 0) |
563 | dccp_insert_option_timestamp_echo(sk, skb); | |
564 | } | |
565 | ||
507d37cf ACM |
566 | if (dp->dccps_hc_rx_insert_options) { |
567 | ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb); | |
568 | dp->dccps_hc_rx_insert_options = 0; | |
569 | } | |
570 | if (dp->dccps_hc_tx_insert_options) { | |
571 | ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb); | |
572 | dp->dccps_hc_tx_insert_options = 0; | |
573 | } | |
7c657876 | 574 | |
afe00251 AB |
575 | /* Feature negotiation */ |
576 | switch(DCCP_SKB_CB(skb)->dccpd_type) { | |
577 | /* Data packets can't do feat negotiation */ | |
578 | case DCCP_PKT_DATA: | |
579 | case DCCP_PKT_DATAACK: | |
580 | break; | |
581 | default: | |
582 | dccp_insert_feat(sk, skb); | |
583 | break; | |
584 | } | |
585 | ||
7c657876 ACM |
586 | /* XXX: insert other options when appropriate */ |
587 | ||
588 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
589 | /* The length of all options has to be a multiple of 4 */ | |
590 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
591 | ||
592 | if (padding != 0) { | |
593 | padding = 4 - padding; | |
594 | memset(skb_push(skb, padding), 0, padding); | |
595 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
596 | } | |
597 | } | |
598 | } |