Commit | Line | Data |
---|---|---|
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; | |
6df9424a ACM |
112 | if (pkt_type != DCCP_PKT_DATA) |
113 | mandatory = 1; | |
afe00251 | 114 | break; |
7c657876 ACM |
115 | case DCCPO_NDP_COUNT: |
116 | if (len > 3) | |
117 | goto out_invalid_option; | |
118 | ||
119 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
7690af3f ACM |
120 | dccp_pr_debug("%sNDP count=%d\n", debug_prefix, |
121 | opt_recv->dccpor_ndp); | |
7c657876 | 122 | break; |
afe00251 AB |
123 | case DCCPO_CHANGE_L: |
124 | /* fall through */ | |
125 | case DCCPO_CHANGE_R: | |
126 | if (len < 2) | |
127 | goto out_invalid_option; | |
128 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
129 | len - 1); | |
130 | /* | |
131 | * When there is a change error, change_recv is | |
132 | * responsible for dealing with it. i.e. reply with an | |
133 | * empty confirm. | |
134 | * If the change was mandatory, then we need to die. | |
135 | */ | |
136 | if (rc && mandatory) | |
137 | goto out_invalid_option; | |
138 | break; | |
139 | case DCCPO_CONFIRM_L: | |
140 | /* fall through */ | |
141 | case DCCPO_CONFIRM_R: | |
142 | if (len < 2) | |
143 | goto out_invalid_option; | |
144 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
145 | value + 1, len - 1)) | |
146 | goto out_invalid_option; | |
147 | break; | |
7c657876 | 148 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 149 | case DCCPO_ACK_VECTOR_1: |
7c657876 | 150 | if (pkt_type == DCCP_PKT_DATA) |
e5a6de91 | 151 | break; |
7c657876 | 152 | |
ae31c339 ACM |
153 | if (dp->dccps_options.dccpo_send_ack_vector && |
154 | dccp_ackvec_parse(sk, skb, opt, value, len)) | |
155 | goto out_invalid_option; | |
7c657876 ACM |
156 | break; |
157 | case DCCPO_TIMESTAMP: | |
158 | if (len != 4) | |
159 | goto out_invalid_option; | |
160 | ||
60fe62e7 | 161 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
7c657876 ACM |
162 | |
163 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
b0e56780 | 164 | dccp_timestamp(sk, &dp->dccps_timestamp_time); |
7c657876 ACM |
165 | |
166 | dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n", | |
167 | debug_prefix, opt_recv->dccpor_timestamp, | |
f6ccf554 | 168 | (unsigned long long) |
7c657876 ACM |
169 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
170 | break; | |
171 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 172 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
173 | goto out_invalid_option; |
174 | ||
60fe62e7 | 175 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
7c657876 | 176 | |
1bc09869 | 177 | dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ", |
7690af3f ACM |
178 | debug_prefix, |
179 | opt_recv->dccpor_timestamp_echo, | |
f6ccf554 DM |
180 | len + 2, |
181 | (unsigned long long) | |
1bc09869 IM |
182 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
183 | ||
1bc09869 | 184 | |
1c14ac0a ACM |
185 | if (len == 4) |
186 | break; | |
187 | ||
188 | if (len == 6) | |
60fe62e7 | 189 | elapsed_time = ntohs(*(__be16 *)(value + 4)); |
1c14ac0a | 190 | else |
60fe62e7 | 191 | elapsed_time = ntohl(*(__be32 *)(value + 4)); |
1c14ac0a ACM |
192 | |
193 | /* Give precedence to the biggest ELAPSED_TIME */ | |
194 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
195 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
7c657876 ACM |
196 | break; |
197 | case DCCPO_ELAPSED_TIME: | |
1bc09869 | 198 | if (len != 2 && len != 4) |
7c657876 ACM |
199 | goto out_invalid_option; |
200 | ||
201 | if (pkt_type == DCCP_PKT_DATA) | |
202 | continue; | |
1bc09869 IM |
203 | |
204 | if (len == 2) | |
60fe62e7 | 205 | elapsed_time = ntohs(*(__be16 *)value); |
1bc09869 | 206 | else |
60fe62e7 | 207 | elapsed_time = ntohl(*(__be32 *)value); |
1c14ac0a ACM |
208 | |
209 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
210 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 211 | |
7c657876 | 212 | dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix, |
1c14ac0a | 213 | elapsed_time); |
7c657876 ACM |
214 | break; |
215 | /* | |
216 | * From draft-ietf-dccp-spec-11.txt: | |
217 | * | |
7690af3f ACM |
218 | * Option numbers 128 through 191 are for |
219 | * options sent from the HC-Sender to the | |
220 | * HC-Receiver; option numbers 192 through 255 | |
221 | * are for options sent from the HC-Receiver to | |
222 | * the HC-Sender. | |
7c657876 ACM |
223 | */ |
224 | case 128 ... 191: { | |
225 | const u16 idx = value - options; | |
226 | ||
7690af3f ACM |
227 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
228 | opt, len, idx, | |
229 | value) != 0) | |
7c657876 ACM |
230 | goto out_invalid_option; |
231 | } | |
232 | break; | |
233 | case 192 ... 255: { | |
234 | const u16 idx = value - options; | |
235 | ||
7690af3f ACM |
236 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
237 | opt, len, idx, | |
238 | value) != 0) | |
7c657876 ACM |
239 | goto out_invalid_option; |
240 | } | |
241 | break; | |
242 | default: | |
7690af3f ACM |
243 | pr_info("DCCP(%p): option %d(len=%d) not " |
244 | "implemented, ignoring\n", | |
7c657876 ACM |
245 | sk, opt, len); |
246 | break; | |
247 | } | |
afe00251 AB |
248 | |
249 | if (opt != DCCPO_MANDATORY) | |
250 | mandatory = 0; | |
7c657876 ACM |
251 | } |
252 | ||
6df9424a ACM |
253 | /* mandatory was the last byte in option list -> reset connection */ |
254 | if (mandatory) | |
255 | goto out_invalid_option; | |
256 | ||
7c657876 ACM |
257 | return 0; |
258 | ||
259 | out_invalid_option: | |
260 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); | |
261 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; | |
262 | pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); | |
263 | return -1; | |
264 | } | |
265 | ||
b61fafc4 ACM |
266 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
267 | ||
7c657876 ACM |
268 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
269 | const unsigned int len) | |
270 | { | |
271 | if (len > 3) | |
272 | *to++ = (value & 0xFF000000) >> 24; | |
273 | if (len > 2) | |
274 | *to++ = (value & 0xFF0000) >> 16; | |
275 | if (len > 1) | |
276 | *to++ = (value & 0xFF00) >> 8; | |
277 | if (len > 0) | |
278 | *to++ = (value & 0xFF); | |
279 | } | |
280 | ||
281 | static inline int dccp_ndp_len(const int ndp) | |
282 | { | |
283 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; | |
284 | } | |
285 | ||
2d0817d1 | 286 | int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
287 | const unsigned char option, |
288 | const void *value, const unsigned char len) | |
289 | { | |
290 | unsigned char *to; | |
291 | ||
2d0817d1 ACM |
292 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
293 | return -1; | |
7c657876 ACM |
294 | |
295 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; | |
296 | ||
297 | to = skb_push(skb, len + 2); | |
298 | *to++ = option; | |
299 | *to++ = len + 2; | |
300 | ||
301 | memcpy(to, value, len); | |
2d0817d1 | 302 | return 0; |
7c657876 ACM |
303 | } |
304 | ||
305 | EXPORT_SYMBOL_GPL(dccp_insert_option); | |
306 | ||
2d0817d1 | 307 | static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
308 | { |
309 | struct dccp_sock *dp = dccp_sk(sk); | |
310 | int ndp = dp->dccps_ndp_count; | |
311 | ||
312 | if (dccp_non_data_packet(skb)) | |
313 | ++dp->dccps_ndp_count; | |
314 | else | |
315 | dp->dccps_ndp_count = 0; | |
316 | ||
317 | if (ndp > 0) { | |
318 | unsigned char *ptr; | |
319 | const int ndp_len = dccp_ndp_len(ndp); | |
320 | const int len = ndp_len + 2; | |
321 | ||
322 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) | |
2d0817d1 | 323 | return -1; |
7c657876 ACM |
324 | |
325 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
326 | ||
327 | ptr = skb_push(skb, len); | |
328 | *ptr++ = DCCPO_NDP_COUNT; | |
329 | *ptr++ = len; | |
330 | dccp_encode_value_var(ndp, ptr, ndp_len); | |
331 | } | |
2d0817d1 ACM |
332 | |
333 | return 0; | |
7c657876 ACM |
334 | } |
335 | ||
336 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) | |
337 | { | |
b1c9fe7b | 338 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
7c657876 ACM |
339 | } |
340 | ||
2d0817d1 ACM |
341 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
342 | u32 elapsed_time) | |
7c657876 | 343 | { |
7c657876 ACM |
344 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
345 | const int len = 2 + elapsed_time_len; | |
346 | unsigned char *to; | |
347 | ||
1bc09869 | 348 | if (elapsed_time_len == 0) |
2d0817d1 | 349 | return 0; |
7c657876 | 350 | |
2d0817d1 ACM |
351 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
352 | return -1; | |
7c657876 ACM |
353 | |
354 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
355 | ||
356 | to = skb_push(skb, len); | |
357 | *to++ = DCCPO_ELAPSED_TIME; | |
358 | *to++ = len; | |
359 | ||
1bc09869 | 360 | if (elapsed_time_len == 2) { |
60fe62e7 | 361 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
362 | memcpy(to, &var16, 2); |
363 | } else { | |
60fe62e7 | 364 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
365 | memcpy(to, &var32, 4); |
366 | } | |
7c657876 | 367 | |
2d0817d1 | 368 | return 0; |
7c657876 ACM |
369 | } |
370 | ||
d4b81ff7 | 371 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
7c657876 | 372 | |
b0e56780 ACM |
373 | void dccp_timestamp(const struct sock *sk, struct timeval *tv) |
374 | { | |
375 | const struct dccp_sock *dp = dccp_sk(sk); | |
376 | ||
377 | do_gettimeofday(tv); | |
378 | tv->tv_sec -= dp->dccps_epoch.tv_sec; | |
379 | tv->tv_usec -= dp->dccps_epoch.tv_usec; | |
380 | ||
381 | while (tv->tv_usec < 0) { | |
382 | tv->tv_sec--; | |
383 | tv->tv_usec += USEC_PER_SEC; | |
384 | } | |
385 | } | |
386 | ||
387 | EXPORT_SYMBOL_GPL(dccp_timestamp); | |
388 | ||
2d0817d1 | 389 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 390 | { |
1bc09869 | 391 | struct timeval tv; |
60fe62e7 | 392 | __be32 now; |
afe00251 | 393 | |
b0e56780 | 394 | dccp_timestamp(sk, &tv); |
60fe62e7 | 395 | now = htonl(timeval_usecs(&tv) / 10); |
1bc09869 IM |
396 | /* yes this will overflow but that is the point as we want a |
397 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
398 | ||
2d0817d1 | 399 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
7c657876 ACM |
400 | } |
401 | ||
d4b81ff7 ACM |
402 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
403 | ||
2d0817d1 ACM |
404 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
405 | struct sk_buff *skb) | |
7c657876 ACM |
406 | { |
407 | struct dccp_sock *dp = dccp_sk(sk); | |
b0e56780 | 408 | struct timeval now; |
60fe62e7 | 409 | __be32 tstamp_echo; |
b0e56780 ACM |
410 | u32 elapsed_time; |
411 | int len, elapsed_time_len; | |
7c657876 ACM |
412 | unsigned char *to; |
413 | ||
b0e56780 ACM |
414 | dccp_timestamp(sk, &now); |
415 | elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; | |
416 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); | |
417 | len = 6 + elapsed_time_len; | |
418 | ||
2d0817d1 ACM |
419 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
420 | return -1; | |
7c657876 ACM |
421 | |
422 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
423 | ||
424 | to = skb_push(skb, len); | |
425 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
426 | *to++ = len; | |
427 | ||
428 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
429 | memcpy(to, &tstamp_echo, 4); | |
430 | to += 4; | |
afe00251 | 431 | |
1bc09869 | 432 | if (elapsed_time_len == 2) { |
60fe62e7 | 433 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
434 | memcpy(to, &var16, 2); |
435 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 436 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
437 | memcpy(to, &var32, 4); |
438 | } | |
7c657876 | 439 | |
7c657876 | 440 | dp->dccps_timestamp_echo = 0; |
1bc09869 IM |
441 | dp->dccps_timestamp_time.tv_sec = 0; |
442 | dp->dccps_timestamp_time.tv_usec = 0; | |
2d0817d1 | 443 | return 0; |
7c657876 ACM |
444 | } |
445 | ||
afe00251 AB |
446 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
447 | u8 *val, u8 len) | |
448 | { | |
449 | u8 *to; | |
450 | ||
451 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
452 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" | |
453 | " to insert feature %d option!\n", feat); | |
454 | return -1; | |
455 | } | |
456 | ||
457 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
458 | ||
459 | to = skb_push(skb, len + 3); | |
460 | *to++ = type; | |
461 | *to++ = len + 3; | |
462 | *to++ = feat; | |
463 | ||
464 | if (len) | |
465 | memcpy(to, val, len); | |
466 | dccp_pr_debug("option %d feat %d len %d\n", type, feat, len); | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
2d0817d1 | 471 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
afe00251 AB |
472 | { |
473 | struct dccp_sock *dp = dccp_sk(sk); | |
474 | struct dccp_opt_pend *opt, *next; | |
475 | int change = 0; | |
476 | ||
477 | /* confirm any options [NN opts] */ | |
478 | list_for_each_entry_safe(opt, next, &dp->dccps_options.dccpo_conf, | |
479 | dccpop_node) { | |
480 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
481 | opt->dccpop_feat, opt->dccpop_val, | |
482 | opt->dccpop_len); | |
483 | /* fear empty confirms */ | |
484 | if (opt->dccpop_val) | |
485 | kfree(opt->dccpop_val); | |
486 | kfree(opt); | |
487 | } | |
488 | INIT_LIST_HEAD(&dp->dccps_options.dccpo_conf); | |
489 | ||
490 | /* see which features we need to send */ | |
491 | list_for_each_entry(opt, &dp->dccps_options.dccpo_pending, | |
492 | dccpop_node) { | |
493 | /* see if we need to send any confirm */ | |
494 | if (opt->dccpop_sc) { | |
495 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
496 | opt->dccpop_feat, | |
497 | opt->dccpop_sc->dccpoc_val, | |
498 | opt->dccpop_sc->dccpoc_len); | |
499 | ||
500 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
501 | kfree(opt->dccpop_sc->dccpoc_val); | |
502 | kfree(opt->dccpop_sc); | |
503 | opt->dccpop_sc = NULL; | |
504 | } | |
505 | ||
506 | /* any option not confirmed, re-send it */ | |
507 | if (!opt->dccpop_conf) { | |
508 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
509 | opt->dccpop_feat, opt->dccpop_val, | |
510 | opt->dccpop_len); | |
511 | change++; | |
512 | } | |
513 | } | |
514 | ||
515 | /* Retransmit timer. | |
516 | * If this is the master listening sock, we don't set a timer on it. It | |
517 | * should be fine because if the dude doesn't receive our RESPONSE | |
518 | * [which will contain the CHANGE] he will send another REQUEST which | |
519 | * will "retrnasmit" the change. | |
520 | */ | |
521 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
522 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
523 | ||
524 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
525 | * only when sending new stuff i guess. Currently the timer | |
526 | * never backs off because on re-transmission it just resets it! | |
527 | */ | |
528 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
529 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
530 | } | |
2d0817d1 ACM |
531 | |
532 | return 0; | |
afe00251 AB |
533 | } |
534 | ||
2d0817d1 | 535 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
536 | { |
537 | struct dccp_sock *dp = dccp_sk(sk); | |
538 | ||
539 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
540 | ||
2d0817d1 ACM |
541 | if (dp->dccps_options.dccpo_send_ndp_count && |
542 | dccp_insert_option_ndp(sk, skb)) | |
543 | return -1; | |
7c657876 ACM |
544 | |
545 | if (!dccp_packet_without_ack(skb)) { | |
546 | if (dp->dccps_options.dccpo_send_ack_vector && | |
2d0817d1 ACM |
547 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
548 | dccp_insert_option_ackvec(sk, skb)) | |
549 | return -1; | |
550 | ||
551 | if (dp->dccps_timestamp_echo != 0 && | |
552 | dccp_insert_option_timestamp_echo(sk, skb)) | |
553 | return -1; | |
7c657876 ACM |
554 | } |
555 | ||
507d37cf | 556 | if (dp->dccps_hc_rx_insert_options) { |
2d0817d1 ACM |
557 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
558 | return -1; | |
507d37cf ACM |
559 | dp->dccps_hc_rx_insert_options = 0; |
560 | } | |
561 | if (dp->dccps_hc_tx_insert_options) { | |
2d0817d1 ACM |
562 | if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb)) |
563 | return -1; | |
507d37cf ACM |
564 | dp->dccps_hc_tx_insert_options = 0; |
565 | } | |
7c657876 | 566 | |
afe00251 | 567 | /* Feature negotiation */ |
2d0817d1 ACM |
568 | /* Data packets can't do feat negotiation */ |
569 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && | |
570 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && | |
571 | dccp_insert_options_feat(sk, skb)) | |
572 | return -1; | |
afe00251 | 573 | |
7c657876 ACM |
574 | /* XXX: insert other options when appropriate */ |
575 | ||
576 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
577 | /* The length of all options has to be a multiple of 4 */ | |
578 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
579 | ||
580 | if (padding != 0) { | |
581 | padding = 4 - padding; | |
582 | memset(skb_push(skb, padding), 0, padding); | |
583 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
584 | } | |
585 | } | |
2d0817d1 ACM |
586 | |
587 | return 0; | |
7c657876 | 588 | } |