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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> | |
e6bccd35 | 7 | * Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.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 | */ | |
7c657876 ACM |
14 | #include <linux/dccp.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/skbuff.h> | |
19 | ||
ae31c339 | 20 | #include "ackvec.h" |
7c657876 ACM |
21 | #include "ccid.h" |
22 | #include "dccp.h" | |
afe00251 | 23 | #include "feat.h" |
7c657876 | 24 | |
afb0a34d GR |
25 | int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; |
26 | int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID; | |
27 | int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID; | |
28 | int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO; | |
29 | int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; | |
30 | int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; | |
7c657876 | 31 | |
7c657876 ACM |
32 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) |
33 | { | |
34 | u32 value = 0; | |
35 | ||
36 | if (len > 3) | |
37 | value += *bf++ << 24; | |
38 | if (len > 2) | |
39 | value += *bf++ << 16; | |
40 | if (len > 1) | |
41 | value += *bf++ << 8; | |
42 | if (len > 0) | |
43 | value += *bf; | |
44 | ||
45 | return value; | |
46 | } | |
47 | ||
48 | int dccp_parse_options(struct sock *sk, struct sk_buff *skb) | |
49 | { | |
50 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 ACM |
51 | const struct dccp_hdr *dh = dccp_hdr(skb); |
52 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; | |
bdf13d20 | 53 | u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; |
7c657876 ACM |
54 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); |
55 | unsigned char *opt_ptr = options; | |
7690af3f ACM |
56 | const unsigned char *opt_end = (unsigned char *)dh + |
57 | (dh->dccph_doff * 4); | |
7c657876 ACM |
58 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
59 | unsigned char opt, len; | |
60 | unsigned char *value; | |
1c14ac0a | 61 | u32 elapsed_time; |
afe00251 AB |
62 | int rc; |
63 | int mandatory = 0; | |
7c657876 ACM |
64 | |
65 | memset(opt_recv, 0, sizeof(*opt_recv)); | |
66 | ||
fb950496 | 67 | opt = len = 0; |
7c657876 ACM |
68 | while (opt_ptr != opt_end) { |
69 | opt = *opt_ptr++; | |
70 | len = 0; | |
71 | value = NULL; | |
72 | ||
73 | /* Check if this isn't a single byte option */ | |
74 | if (opt > DCCPO_MAX_RESERVED) { | |
75 | if (opt_ptr == opt_end) | |
76 | goto out_invalid_option; | |
77 | ||
78 | len = *opt_ptr++; | |
79 | if (len < 3) | |
80 | goto out_invalid_option; | |
81 | /* | |
82 | * Remove the type and len fields, leaving | |
83 | * just the value size | |
84 | */ | |
85 | len -= 2; | |
86 | value = opt_ptr; | |
87 | opt_ptr += len; | |
88 | ||
89 | if (opt_ptr > opt_end) | |
90 | goto out_invalid_option; | |
91 | } | |
92 | ||
93 | switch (opt) { | |
94 | case DCCPO_PADDING: | |
95 | break; | |
afe00251 AB |
96 | case DCCPO_MANDATORY: |
97 | if (mandatory) | |
98 | goto out_invalid_option; | |
6df9424a ACM |
99 | if (pkt_type != DCCP_PKT_DATA) |
100 | mandatory = 1; | |
afe00251 | 101 | break; |
7c657876 ACM |
102 | case DCCPO_NDP_COUNT: |
103 | if (len > 3) | |
104 | goto out_invalid_option; | |
105 | ||
106 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
09dbc389 | 107 | dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), |
7690af3f | 108 | opt_recv->dccpor_ndp); |
7c657876 | 109 | break; |
afe00251 AB |
110 | case DCCPO_CHANGE_L: |
111 | /* fall through */ | |
112 | case DCCPO_CHANGE_R: | |
113 | if (len < 2) | |
114 | goto out_invalid_option; | |
115 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
116 | len - 1); | |
117 | /* | |
118 | * When there is a change error, change_recv is | |
119 | * responsible for dealing with it. i.e. reply with an | |
120 | * empty confirm. | |
121 | * If the change was mandatory, then we need to die. | |
122 | */ | |
123 | if (rc && mandatory) | |
124 | goto out_invalid_option; | |
125 | break; | |
126 | case DCCPO_CONFIRM_L: | |
127 | /* fall through */ | |
128 | case DCCPO_CONFIRM_R: | |
129 | if (len < 2) | |
130 | goto out_invalid_option; | |
131 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
132 | value + 1, len - 1)) | |
133 | goto out_invalid_option; | |
134 | break; | |
7c657876 | 135 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 136 | case DCCPO_ACK_VECTOR_1: |
7c657876 | 137 | if (pkt_type == DCCP_PKT_DATA) |
e5a6de91 | 138 | break; |
7c657876 | 139 | |
a4bf3902 | 140 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
bdf13d20 | 141 | dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) |
ae31c339 | 142 | goto out_invalid_option; |
7c657876 ACM |
143 | break; |
144 | case DCCPO_TIMESTAMP: | |
145 | if (len != 4) | |
146 | goto out_invalid_option; | |
147 | ||
60fe62e7 | 148 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
7c657876 ACM |
149 | |
150 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
19ac2146 | 151 | dp->dccps_timestamp_time = ktime_get_real(); |
7c657876 | 152 | |
09dbc389 GR |
153 | dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", |
154 | dccp_role(sk), opt_recv->dccpor_timestamp, | |
f6ccf554 | 155 | (unsigned long long) |
7c657876 ACM |
156 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
157 | break; | |
158 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 159 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
160 | goto out_invalid_option; |
161 | ||
60fe62e7 | 162 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
7c657876 | 163 | |
09dbc389 | 164 | dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " |
f73f7097 | 165 | "ackno=%llu", dccp_role(sk), |
7690af3f | 166 | opt_recv->dccpor_timestamp_echo, |
f6ccf554 DM |
167 | len + 2, |
168 | (unsigned long long) | |
1bc09869 IM |
169 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
170 | ||
1bc09869 | 171 | |
f73f7097 GR |
172 | if (len == 4) { |
173 | dccp_pr_debug_cat("\n"); | |
1c14ac0a | 174 | break; |
f73f7097 | 175 | } |
1c14ac0a ACM |
176 | |
177 | if (len == 6) | |
60fe62e7 | 178 | elapsed_time = ntohs(*(__be16 *)(value + 4)); |
1c14ac0a | 179 | else |
60fe62e7 | 180 | elapsed_time = ntohl(*(__be32 *)(value + 4)); |
1c14ac0a | 181 | |
dcad856f | 182 | dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time); |
f73f7097 | 183 | |
1c14ac0a ACM |
184 | /* Give precedence to the biggest ELAPSED_TIME */ |
185 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
186 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
7c657876 ACM |
187 | break; |
188 | case DCCPO_ELAPSED_TIME: | |
1bc09869 | 189 | if (len != 2 && len != 4) |
7c657876 ACM |
190 | goto out_invalid_option; |
191 | ||
192 | if (pkt_type == DCCP_PKT_DATA) | |
193 | continue; | |
1bc09869 IM |
194 | |
195 | if (len == 2) | |
60fe62e7 | 196 | elapsed_time = ntohs(*(__be16 *)value); |
1bc09869 | 197 | else |
60fe62e7 | 198 | elapsed_time = ntohl(*(__be32 *)value); |
1c14ac0a ACM |
199 | |
200 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
201 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 202 | |
09dbc389 GR |
203 | dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", |
204 | dccp_role(sk), elapsed_time); | |
7c657876 ACM |
205 | break; |
206 | /* | |
0e64e94e | 207 | * From RFC 4340, sec. 10.3: |
7c657876 | 208 | * |
7690af3f ACM |
209 | * Option numbers 128 through 191 are for |
210 | * options sent from the HC-Sender to the | |
211 | * HC-Receiver; option numbers 192 through 255 | |
212 | * are for options sent from the HC-Receiver to | |
213 | * the HC-Sender. | |
7c657876 ACM |
214 | */ |
215 | case 128 ... 191: { | |
216 | const u16 idx = value - options; | |
217 | ||
7690af3f ACM |
218 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
219 | opt, len, idx, | |
220 | value) != 0) | |
7c657876 ACM |
221 | goto out_invalid_option; |
222 | } | |
223 | break; | |
224 | case 192 ... 255: { | |
225 | const u16 idx = value - options; | |
226 | ||
7690af3f ACM |
227 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
228 | opt, len, idx, | |
229 | value) != 0) | |
7c657876 ACM |
230 | goto out_invalid_option; |
231 | } | |
232 | break; | |
233 | default: | |
59348b19 GR |
234 | DCCP_CRIT("DCCP(%p): option %d(len=%d) not " |
235 | "implemented, ignoring", sk, opt, len); | |
7c657876 | 236 | break; |
c9eaf173 | 237 | } |
afe00251 AB |
238 | |
239 | if (opt != DCCPO_MANDATORY) | |
240 | mandatory = 0; | |
7c657876 ACM |
241 | } |
242 | ||
6df9424a ACM |
243 | /* mandatory was the last byte in option list -> reset connection */ |
244 | if (mandatory) | |
245 | goto out_invalid_option; | |
246 | ||
7c657876 ACM |
247 | return 0; |
248 | ||
249 | out_invalid_option: | |
250 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); | |
251 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; | |
59348b19 | 252 | DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); |
7c657876 ACM |
253 | return -1; |
254 | } | |
255 | ||
b61fafc4 ACM |
256 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
257 | ||
7c657876 ACM |
258 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
259 | const unsigned int len) | |
260 | { | |
261 | if (len > 3) | |
262 | *to++ = (value & 0xFF000000) >> 24; | |
263 | if (len > 2) | |
264 | *to++ = (value & 0xFF0000) >> 16; | |
265 | if (len > 1) | |
266 | *to++ = (value & 0xFF00) >> 8; | |
267 | if (len > 0) | |
268 | *to++ = (value & 0xFF); | |
269 | } | |
270 | ||
271 | static inline int dccp_ndp_len(const int ndp) | |
272 | { | |
273 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; | |
274 | } | |
275 | ||
2d0817d1 | 276 | int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
277 | const unsigned char option, |
278 | const void *value, const unsigned char len) | |
279 | { | |
280 | unsigned char *to; | |
281 | ||
2d0817d1 ACM |
282 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
283 | return -1; | |
7c657876 ACM |
284 | |
285 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; | |
286 | ||
287 | to = skb_push(skb, len + 2); | |
288 | *to++ = option; | |
289 | *to++ = len + 2; | |
290 | ||
291 | memcpy(to, value, len); | |
2d0817d1 | 292 | return 0; |
7c657876 ACM |
293 | } |
294 | ||
295 | EXPORT_SYMBOL_GPL(dccp_insert_option); | |
296 | ||
2d0817d1 | 297 | static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
298 | { |
299 | struct dccp_sock *dp = dccp_sk(sk); | |
300 | int ndp = dp->dccps_ndp_count; | |
301 | ||
302 | if (dccp_non_data_packet(skb)) | |
303 | ++dp->dccps_ndp_count; | |
304 | else | |
305 | dp->dccps_ndp_count = 0; | |
306 | ||
307 | if (ndp > 0) { | |
308 | unsigned char *ptr; | |
309 | const int ndp_len = dccp_ndp_len(ndp); | |
310 | const int len = ndp_len + 2; | |
311 | ||
312 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) | |
2d0817d1 | 313 | return -1; |
7c657876 ACM |
314 | |
315 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
316 | ||
317 | ptr = skb_push(skb, len); | |
318 | *ptr++ = DCCPO_NDP_COUNT; | |
319 | *ptr++ = len; | |
320 | dccp_encode_value_var(ndp, ptr, ndp_len); | |
321 | } | |
2d0817d1 ACM |
322 | |
323 | return 0; | |
7c657876 ACM |
324 | } |
325 | ||
326 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) | |
327 | { | |
b1c9fe7b | 328 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
7c657876 ACM |
329 | } |
330 | ||
2d0817d1 ACM |
331 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
332 | u32 elapsed_time) | |
7c657876 | 333 | { |
7c657876 ACM |
334 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
335 | const int len = 2 + elapsed_time_len; | |
336 | unsigned char *to; | |
337 | ||
1bc09869 | 338 | if (elapsed_time_len == 0) |
2d0817d1 | 339 | return 0; |
7c657876 | 340 | |
2d0817d1 ACM |
341 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
342 | return -1; | |
7c657876 ACM |
343 | |
344 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
345 | ||
346 | to = skb_push(skb, len); | |
347 | *to++ = DCCPO_ELAPSED_TIME; | |
348 | *to++ = len; | |
349 | ||
1bc09869 | 350 | if (elapsed_time_len == 2) { |
60fe62e7 | 351 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
352 | memcpy(to, &var16, 2); |
353 | } else { | |
60fe62e7 | 354 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
355 | memcpy(to, &var32, 4); |
356 | } | |
7c657876 | 357 | |
2d0817d1 | 358 | return 0; |
7c657876 ACM |
359 | } |
360 | ||
d4b81ff7 | 361 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
7c657876 | 362 | |
2d0817d1 | 363 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 364 | { |
4c70f383 | 365 | __be32 now = htonl(dccp_timestamp()); |
1bc09869 IM |
366 | /* yes this will overflow but that is the point as we want a |
367 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
368 | ||
2d0817d1 | 369 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
7c657876 ACM |
370 | } |
371 | ||
d4b81ff7 ACM |
372 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
373 | ||
2d0817d1 ACM |
374 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
375 | struct sk_buff *skb) | |
7c657876 ACM |
376 | { |
377 | struct dccp_sock *dp = dccp_sk(sk); | |
60fe62e7 | 378 | __be32 tstamp_echo; |
b0e56780 | 379 | int len, elapsed_time_len; |
7c657876 | 380 | unsigned char *to; |
19ac2146 ACM |
381 | const suseconds_t delta = ktime_us_delta(ktime_get_real(), |
382 | dp->dccps_timestamp_time); | |
383 | u32 elapsed_time = delta / 10; | |
b0e56780 ACM |
384 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
385 | len = 6 + elapsed_time_len; | |
386 | ||
2d0817d1 ACM |
387 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
388 | return -1; | |
7c657876 ACM |
389 | |
390 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
391 | ||
392 | to = skb_push(skb, len); | |
393 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
394 | *to++ = len; | |
395 | ||
396 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
397 | memcpy(to, &tstamp_echo, 4); | |
398 | to += 4; | |
afe00251 | 399 | |
1bc09869 | 400 | if (elapsed_time_len == 2) { |
60fe62e7 | 401 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
402 | memcpy(to, &var16, 2); |
403 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 404 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
405 | memcpy(to, &var32, 4); |
406 | } | |
7c657876 | 407 | |
7c657876 | 408 | dp->dccps_timestamp_echo = 0; |
19ac2146 | 409 | dp->dccps_timestamp_time = ktime_set(0, 0); |
2d0817d1 | 410 | return 0; |
7c657876 ACM |
411 | } |
412 | ||
afe00251 | 413 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
c9eaf173 | 414 | u8 *val, u8 len) |
afe00251 AB |
415 | { |
416 | u8 *to; | |
417 | ||
418 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
59348b19 | 419 | DCCP_WARN("packet too small for feature %d option!\n", feat); |
afe00251 AB |
420 | return -1; |
421 | } | |
422 | ||
423 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
424 | ||
425 | to = skb_push(skb, len + 3); | |
426 | *to++ = type; | |
427 | *to++ = len + 3; | |
428 | *to++ = feat; | |
429 | ||
430 | if (len) | |
431 | memcpy(to, val, len); | |
afe00251 | 432 | |
c02fdc0e GR |
433 | dccp_pr_debug("%s(%s (%d), ...), length %d\n", |
434 | dccp_feat_typename(type), | |
435 | dccp_feat_name(feat), feat, len); | |
afe00251 AB |
436 | return 0; |
437 | } | |
438 | ||
2d0817d1 | 439 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
afe00251 AB |
440 | { |
441 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 442 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
443 | struct dccp_opt_pend *opt, *next; |
444 | int change = 0; | |
445 | ||
446 | /* confirm any options [NN opts] */ | |
a4bf3902 | 447 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
448 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
449 | opt->dccpop_feat, opt->dccpop_val, | |
450 | opt->dccpop_len); | |
451 | /* fear empty confirms */ | |
452 | if (opt->dccpop_val) | |
453 | kfree(opt->dccpop_val); | |
454 | kfree(opt); | |
455 | } | |
a4bf3902 | 456 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
457 | |
458 | /* see which features we need to send */ | |
a4bf3902 | 459 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
460 | /* see if we need to send any confirm */ |
461 | if (opt->dccpop_sc) { | |
462 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
463 | opt->dccpop_feat, | |
464 | opt->dccpop_sc->dccpoc_val, | |
465 | opt->dccpop_sc->dccpoc_len); | |
466 | ||
467 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
468 | kfree(opt->dccpop_sc->dccpoc_val); | |
469 | kfree(opt->dccpop_sc); | |
470 | opt->dccpop_sc = NULL; | |
471 | } | |
472 | ||
473 | /* any option not confirmed, re-send it */ | |
474 | if (!opt->dccpop_conf) { | |
475 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
476 | opt->dccpop_feat, opt->dccpop_val, | |
477 | opt->dccpop_len); | |
478 | change++; | |
479 | } | |
480 | } | |
481 | ||
482 | /* Retransmit timer. | |
483 | * If this is the master listening sock, we don't set a timer on it. It | |
484 | * should be fine because if the dude doesn't receive our RESPONSE | |
485 | * [which will contain the CHANGE] he will send another REQUEST which | |
486 | * will "retrnasmit" the change. | |
487 | */ | |
488 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
489 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
490 | ||
491 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
492 | * only when sending new stuff i guess. Currently the timer | |
493 | * never backs off because on re-transmission it just resets it! | |
494 | */ | |
495 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
496 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
497 | } | |
2d0817d1 ACM |
498 | |
499 | return 0; | |
afe00251 AB |
500 | } |
501 | ||
2d0817d1 | 502 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
503 | { |
504 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 505 | struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 ACM |
506 | |
507 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
508 | ||
a4bf3902 | 509 | if (dmsk->dccpms_send_ndp_count && |
2d0817d1 ACM |
510 | dccp_insert_option_ndp(sk, skb)) |
511 | return -1; | |
7c657876 ACM |
512 | |
513 | if (!dccp_packet_without_ack(skb)) { | |
a4bf3902 | 514 | if (dmsk->dccpms_send_ack_vector && |
2d0817d1 ACM |
515 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
516 | dccp_insert_option_ackvec(sk, skb)) | |
517 | return -1; | |
518 | ||
519 | if (dp->dccps_timestamp_echo != 0 && | |
520 | dccp_insert_option_timestamp_echo(sk, skb)) | |
521 | return -1; | |
7c657876 ACM |
522 | } |
523 | ||
507d37cf | 524 | if (dp->dccps_hc_rx_insert_options) { |
2d0817d1 ACM |
525 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
526 | return -1; | |
507d37cf ACM |
527 | dp->dccps_hc_rx_insert_options = 0; |
528 | } | |
7c657876 | 529 | |
afe00251 | 530 | /* Feature negotiation */ |
2d0817d1 ACM |
531 | /* Data packets can't do feat negotiation */ |
532 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && | |
533 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && | |
534 | dccp_insert_options_feat(sk, skb)) | |
535 | return -1; | |
afe00251 | 536 | |
89560b53 GR |
537 | /* |
538 | * Obtain RTT sample from Request/Response exchange. | |
539 | * This is currently used in CCID 3 initialisation. | |
540 | */ | |
541 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST && | |
542 | dccp_insert_option_timestamp(sk, skb)) | |
543 | return -1; | |
544 | ||
7c657876 ACM |
545 | /* XXX: insert other options when appropriate */ |
546 | ||
547 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
548 | /* The length of all options has to be a multiple of 4 */ | |
549 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
550 | ||
551 | if (padding != 0) { | |
552 | padding = 4 - padding; | |
553 | memset(skb_push(skb, padding), 0, padding); | |
554 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
555 | } | |
556 | } | |
2d0817d1 ACM |
557 | |
558 | return 0; | |
7c657876 | 559 | } |