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> | |
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> | |
76fd1e87 | 17 | #include <asm/unaligned.h> |
7c657876 ACM |
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 | |
afb0a34d GR |
26 | int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; |
27 | int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID; | |
28 | int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID; | |
29 | int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO; | |
30 | int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; | |
31 | int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; | |
7c657876 | 32 | |
7c657876 ACM |
33 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) |
34 | { | |
35 | u32 value = 0; | |
36 | ||
37 | if (len > 3) | |
38 | value += *bf++ << 24; | |
39 | if (len > 2) | |
40 | value += *bf++ << 16; | |
41 | if (len > 1) | |
42 | value += *bf++ << 8; | |
43 | if (len > 0) | |
44 | value += *bf; | |
45 | ||
46 | return value; | |
47 | } | |
48 | ||
49 | int dccp_parse_options(struct sock *sk, struct sk_buff *skb) | |
50 | { | |
51 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 ACM |
52 | const struct dccp_hdr *dh = dccp_hdr(skb); |
53 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; | |
bdf13d20 | 54 | u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; |
7c657876 ACM |
55 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); |
56 | unsigned char *opt_ptr = options; | |
7690af3f ACM |
57 | const unsigned char *opt_end = (unsigned char *)dh + |
58 | (dh->dccph_doff * 4); | |
7c657876 ACM |
59 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
60 | unsigned char opt, len; | |
61 | unsigned char *value; | |
1c14ac0a | 62 | u32 elapsed_time; |
76fd1e87 | 63 | __be32 opt_val; |
afe00251 AB |
64 | int rc; |
65 | int mandatory = 0; | |
7c657876 ACM |
66 | |
67 | memset(opt_recv, 0, sizeof(*opt_recv)); | |
68 | ||
fb950496 | 69 | opt = len = 0; |
7c657876 ACM |
70 | while (opt_ptr != opt_end) { |
71 | opt = *opt_ptr++; | |
72 | len = 0; | |
73 | value = NULL; | |
74 | ||
75 | /* Check if this isn't a single byte option */ | |
76 | if (opt > DCCPO_MAX_RESERVED) { | |
77 | if (opt_ptr == opt_end) | |
78 | goto out_invalid_option; | |
79 | ||
80 | len = *opt_ptr++; | |
81 | if (len < 3) | |
82 | goto out_invalid_option; | |
83 | /* | |
84 | * Remove the type and len fields, leaving | |
85 | * just the value size | |
86 | */ | |
87 | len -= 2; | |
88 | value = opt_ptr; | |
89 | opt_ptr += len; | |
90 | ||
91 | if (opt_ptr > opt_end) | |
92 | goto out_invalid_option; | |
93 | } | |
94 | ||
95 | switch (opt) { | |
96 | case DCCPO_PADDING: | |
97 | break; | |
afe00251 AB |
98 | case DCCPO_MANDATORY: |
99 | if (mandatory) | |
100 | goto out_invalid_option; | |
6df9424a ACM |
101 | if (pkt_type != DCCP_PKT_DATA) |
102 | mandatory = 1; | |
afe00251 | 103 | break; |
7c657876 ACM |
104 | case DCCPO_NDP_COUNT: |
105 | if (len > 3) | |
106 | goto out_invalid_option; | |
107 | ||
108 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
09dbc389 | 109 | dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), |
7690af3f | 110 | opt_recv->dccpor_ndp); |
7c657876 | 111 | break; |
afe00251 AB |
112 | case DCCPO_CHANGE_L: |
113 | /* fall through */ | |
114 | case DCCPO_CHANGE_R: | |
115 | if (len < 2) | |
116 | goto out_invalid_option; | |
117 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
118 | len - 1); | |
119 | /* | |
120 | * When there is a change error, change_recv is | |
121 | * responsible for dealing with it. i.e. reply with an | |
122 | * empty confirm. | |
123 | * If the change was mandatory, then we need to die. | |
124 | */ | |
125 | if (rc && mandatory) | |
126 | goto out_invalid_option; | |
127 | break; | |
128 | case DCCPO_CONFIRM_L: | |
129 | /* fall through */ | |
130 | case DCCPO_CONFIRM_R: | |
131 | if (len < 2) | |
132 | goto out_invalid_option; | |
133 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
134 | value + 1, len - 1)) | |
135 | goto out_invalid_option; | |
136 | break; | |
7c657876 | 137 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 138 | case DCCPO_ACK_VECTOR_1: |
7c657876 | 139 | if (pkt_type == DCCP_PKT_DATA) |
e5a6de91 | 140 | break; |
7c657876 | 141 | |
a4bf3902 | 142 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
bdf13d20 | 143 | dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) |
ae31c339 | 144 | goto out_invalid_option; |
7c657876 ACM |
145 | break; |
146 | case DCCPO_TIMESTAMP: | |
147 | if (len != 4) | |
148 | goto out_invalid_option; | |
149 | ||
76fd1e87 GR |
150 | opt_val = get_unaligned((__be32 *)value); |
151 | opt_recv->dccpor_timestamp = ntohl(opt_val); | |
7c657876 ACM |
152 | |
153 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
19ac2146 | 154 | dp->dccps_timestamp_time = ktime_get_real(); |
7c657876 | 155 | |
09dbc389 GR |
156 | dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", |
157 | dccp_role(sk), opt_recv->dccpor_timestamp, | |
f6ccf554 | 158 | (unsigned long long) |
7c657876 ACM |
159 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
160 | break; | |
161 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 162 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
163 | goto out_invalid_option; |
164 | ||
76fd1e87 GR |
165 | opt_val = get_unaligned((__be32 *)value); |
166 | opt_recv->dccpor_timestamp_echo = ntohl(opt_val); | |
7c657876 | 167 | |
09dbc389 | 168 | dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " |
f73f7097 | 169 | "ackno=%llu", dccp_role(sk), |
7690af3f | 170 | opt_recv->dccpor_timestamp_echo, |
f6ccf554 DM |
171 | len + 2, |
172 | (unsigned long long) | |
1bc09869 IM |
173 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
174 | ||
76fd1e87 | 175 | value += 4; |
1bc09869 | 176 | |
76fd1e87 | 177 | if (len == 4) { /* no elapsed time included */ |
f73f7097 | 178 | dccp_pr_debug_cat("\n"); |
1c14ac0a | 179 | break; |
f73f7097 | 180 | } |
1c14ac0a | 181 | |
76fd1e87 GR |
182 | if (len == 6) { /* 2-byte elapsed time */ |
183 | __be16 opt_val2 = get_unaligned((__be16 *)value); | |
184 | elapsed_time = ntohs(opt_val2); | |
185 | } else { /* 4-byte elapsed time */ | |
186 | opt_val = get_unaligned((__be32 *)value); | |
187 | elapsed_time = ntohl(opt_val); | |
188 | } | |
1c14ac0a | 189 | |
dcad856f | 190 | dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time); |
f73f7097 | 191 | |
1c14ac0a ACM |
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 | 202 | |
76fd1e87 GR |
203 | if (len == 2) { |
204 | __be16 opt_val2 = get_unaligned((__be16 *)value); | |
205 | elapsed_time = ntohs(opt_val2); | |
206 | } else { | |
207 | opt_val = get_unaligned((__be32 *)value); | |
208 | elapsed_time = ntohl(opt_val); | |
209 | } | |
1c14ac0a ACM |
210 | |
211 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
212 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 213 | |
09dbc389 GR |
214 | dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", |
215 | dccp_role(sk), elapsed_time); | |
7c657876 ACM |
216 | break; |
217 | /* | |
0e64e94e | 218 | * From RFC 4340, sec. 10.3: |
7c657876 | 219 | * |
7690af3f ACM |
220 | * Option numbers 128 through 191 are for |
221 | * options sent from the HC-Sender to the | |
222 | * HC-Receiver; option numbers 192 through 255 | |
223 | * are for options sent from the HC-Receiver to | |
224 | * the HC-Sender. | |
7c657876 ACM |
225 | */ |
226 | case 128 ... 191: { | |
227 | const u16 idx = value - options; | |
228 | ||
7690af3f ACM |
229 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
230 | opt, len, idx, | |
231 | value) != 0) | |
7c657876 ACM |
232 | goto out_invalid_option; |
233 | } | |
234 | break; | |
235 | case 192 ... 255: { | |
236 | const u16 idx = value - options; | |
237 | ||
7690af3f ACM |
238 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
239 | opt, len, idx, | |
240 | value) != 0) | |
7c657876 ACM |
241 | goto out_invalid_option; |
242 | } | |
243 | break; | |
244 | default: | |
59348b19 GR |
245 | DCCP_CRIT("DCCP(%p): option %d(len=%d) not " |
246 | "implemented, ignoring", sk, opt, len); | |
7c657876 | 247 | break; |
c9eaf173 | 248 | } |
afe00251 AB |
249 | |
250 | if (opt != DCCPO_MANDATORY) | |
251 | mandatory = 0; | |
7c657876 ACM |
252 | } |
253 | ||
6df9424a ACM |
254 | /* mandatory was the last byte in option list -> reset connection */ |
255 | if (mandatory) | |
256 | goto out_invalid_option; | |
257 | ||
7c657876 ACM |
258 | return 0; |
259 | ||
260 | out_invalid_option: | |
261 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); | |
262 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; | |
59348b19 | 263 | DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); |
7c657876 ACM |
264 | return -1; |
265 | } | |
266 | ||
b61fafc4 ACM |
267 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
268 | ||
7c657876 ACM |
269 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
270 | const unsigned int len) | |
271 | { | |
272 | if (len > 3) | |
273 | *to++ = (value & 0xFF000000) >> 24; | |
274 | if (len > 2) | |
275 | *to++ = (value & 0xFF0000) >> 16; | |
276 | if (len > 1) | |
277 | *to++ = (value & 0xFF00) >> 8; | |
278 | if (len > 0) | |
279 | *to++ = (value & 0xFF); | |
280 | } | |
281 | ||
282 | static inline int dccp_ndp_len(const int ndp) | |
283 | { | |
284 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; | |
285 | } | |
286 | ||
2d0817d1 | 287 | int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
288 | const unsigned char option, |
289 | const void *value, const unsigned char len) | |
290 | { | |
291 | unsigned char *to; | |
292 | ||
2d0817d1 ACM |
293 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
294 | return -1; | |
7c657876 ACM |
295 | |
296 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; | |
297 | ||
298 | to = skb_push(skb, len + 2); | |
299 | *to++ = option; | |
300 | *to++ = len + 2; | |
301 | ||
302 | memcpy(to, value, len); | |
2d0817d1 | 303 | return 0; |
7c657876 ACM |
304 | } |
305 | ||
306 | EXPORT_SYMBOL_GPL(dccp_insert_option); | |
307 | ||
2d0817d1 | 308 | static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
309 | { |
310 | struct dccp_sock *dp = dccp_sk(sk); | |
311 | int ndp = dp->dccps_ndp_count; | |
312 | ||
313 | if (dccp_non_data_packet(skb)) | |
314 | ++dp->dccps_ndp_count; | |
315 | else | |
316 | dp->dccps_ndp_count = 0; | |
317 | ||
318 | if (ndp > 0) { | |
319 | unsigned char *ptr; | |
320 | const int ndp_len = dccp_ndp_len(ndp); | |
321 | const int len = ndp_len + 2; | |
322 | ||
323 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) | |
2d0817d1 | 324 | return -1; |
7c657876 ACM |
325 | |
326 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
327 | ||
328 | ptr = skb_push(skb, len); | |
329 | *ptr++ = DCCPO_NDP_COUNT; | |
330 | *ptr++ = len; | |
331 | dccp_encode_value_var(ndp, ptr, ndp_len); | |
332 | } | |
2d0817d1 ACM |
333 | |
334 | return 0; | |
7c657876 ACM |
335 | } |
336 | ||
337 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) | |
338 | { | |
b1c9fe7b | 339 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
7c657876 ACM |
340 | } |
341 | ||
2d0817d1 ACM |
342 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
343 | u32 elapsed_time) | |
7c657876 | 344 | { |
7c657876 ACM |
345 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
346 | const int len = 2 + elapsed_time_len; | |
347 | unsigned char *to; | |
348 | ||
1bc09869 | 349 | if (elapsed_time_len == 0) |
2d0817d1 | 350 | return 0; |
7c657876 | 351 | |
2d0817d1 ACM |
352 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
353 | return -1; | |
7c657876 ACM |
354 | |
355 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
356 | ||
357 | to = skb_push(skb, len); | |
358 | *to++ = DCCPO_ELAPSED_TIME; | |
359 | *to++ = len; | |
360 | ||
1bc09869 | 361 | if (elapsed_time_len == 2) { |
60fe62e7 | 362 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
363 | memcpy(to, &var16, 2); |
364 | } else { | |
60fe62e7 | 365 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
366 | memcpy(to, &var32, 4); |
367 | } | |
7c657876 | 368 | |
2d0817d1 | 369 | return 0; |
7c657876 ACM |
370 | } |
371 | ||
d4b81ff7 | 372 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
7c657876 | 373 | |
2d0817d1 | 374 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 375 | { |
4c70f383 | 376 | __be32 now = htonl(dccp_timestamp()); |
1bc09869 IM |
377 | /* yes this will overflow but that is the point as we want a |
378 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
379 | ||
2d0817d1 | 380 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
7c657876 ACM |
381 | } |
382 | ||
d4b81ff7 ACM |
383 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
384 | ||
2d0817d1 ACM |
385 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
386 | struct sk_buff *skb) | |
7c657876 ACM |
387 | { |
388 | struct dccp_sock *dp = dccp_sk(sk); | |
60fe62e7 | 389 | __be32 tstamp_echo; |
b0e56780 | 390 | int len, elapsed_time_len; |
7c657876 | 391 | unsigned char *to; |
19ac2146 ACM |
392 | const suseconds_t delta = ktime_us_delta(ktime_get_real(), |
393 | dp->dccps_timestamp_time); | |
394 | u32 elapsed_time = delta / 10; | |
b0e56780 ACM |
395 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
396 | len = 6 + elapsed_time_len; | |
397 | ||
2d0817d1 ACM |
398 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
399 | return -1; | |
7c657876 ACM |
400 | |
401 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
402 | ||
403 | to = skb_push(skb, len); | |
404 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
405 | *to++ = len; | |
406 | ||
407 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
408 | memcpy(to, &tstamp_echo, 4); | |
409 | to += 4; | |
afe00251 | 410 | |
1bc09869 | 411 | if (elapsed_time_len == 2) { |
60fe62e7 | 412 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
413 | memcpy(to, &var16, 2); |
414 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 415 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
416 | memcpy(to, &var32, 4); |
417 | } | |
7c657876 | 418 | |
7c657876 | 419 | dp->dccps_timestamp_echo = 0; |
19ac2146 | 420 | dp->dccps_timestamp_time = ktime_set(0, 0); |
2d0817d1 | 421 | return 0; |
7c657876 ACM |
422 | } |
423 | ||
afe00251 | 424 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
c9eaf173 | 425 | u8 *val, u8 len) |
afe00251 AB |
426 | { |
427 | u8 *to; | |
428 | ||
429 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
59348b19 | 430 | DCCP_WARN("packet too small for feature %d option!\n", feat); |
afe00251 AB |
431 | return -1; |
432 | } | |
433 | ||
434 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
435 | ||
436 | to = skb_push(skb, len + 3); | |
437 | *to++ = type; | |
438 | *to++ = len + 3; | |
439 | *to++ = feat; | |
440 | ||
441 | if (len) | |
442 | memcpy(to, val, len); | |
afe00251 | 443 | |
c02fdc0e GR |
444 | dccp_pr_debug("%s(%s (%d), ...), length %d\n", |
445 | dccp_feat_typename(type), | |
446 | dccp_feat_name(feat), feat, len); | |
afe00251 AB |
447 | return 0; |
448 | } | |
449 | ||
2d0817d1 | 450 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
afe00251 AB |
451 | { |
452 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 453 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
454 | struct dccp_opt_pend *opt, *next; |
455 | int change = 0; | |
456 | ||
457 | /* confirm any options [NN opts] */ | |
a4bf3902 | 458 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
459 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
460 | opt->dccpop_feat, opt->dccpop_val, | |
461 | opt->dccpop_len); | |
462 | /* fear empty confirms */ | |
463 | if (opt->dccpop_val) | |
464 | kfree(opt->dccpop_val); | |
465 | kfree(opt); | |
466 | } | |
a4bf3902 | 467 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
468 | |
469 | /* see which features we need to send */ | |
a4bf3902 | 470 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
471 | /* see if we need to send any confirm */ |
472 | if (opt->dccpop_sc) { | |
473 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
474 | opt->dccpop_feat, | |
475 | opt->dccpop_sc->dccpoc_val, | |
476 | opt->dccpop_sc->dccpoc_len); | |
477 | ||
478 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
479 | kfree(opt->dccpop_sc->dccpoc_val); | |
480 | kfree(opt->dccpop_sc); | |
481 | opt->dccpop_sc = NULL; | |
482 | } | |
483 | ||
484 | /* any option not confirmed, re-send it */ | |
485 | if (!opt->dccpop_conf) { | |
486 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
487 | opt->dccpop_feat, opt->dccpop_val, | |
488 | opt->dccpop_len); | |
489 | change++; | |
490 | } | |
491 | } | |
492 | ||
493 | /* Retransmit timer. | |
494 | * If this is the master listening sock, we don't set a timer on it. It | |
495 | * should be fine because if the dude doesn't receive our RESPONSE | |
496 | * [which will contain the CHANGE] he will send another REQUEST which | |
497 | * will "retrnasmit" the change. | |
498 | */ | |
499 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
500 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
501 | ||
502 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
503 | * only when sending new stuff i guess. Currently the timer | |
504 | * never backs off because on re-transmission it just resets it! | |
505 | */ | |
506 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
507 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
508 | } | |
2d0817d1 ACM |
509 | |
510 | return 0; | |
afe00251 AB |
511 | } |
512 | ||
2d0817d1 | 513 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
514 | { |
515 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 516 | struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 ACM |
517 | |
518 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
519 | ||
a4bf3902 | 520 | if (dmsk->dccpms_send_ndp_count && |
2d0817d1 ACM |
521 | dccp_insert_option_ndp(sk, skb)) |
522 | return -1; | |
7c657876 ACM |
523 | |
524 | if (!dccp_packet_without_ack(skb)) { | |
a4bf3902 | 525 | if (dmsk->dccpms_send_ack_vector && |
2d0817d1 ACM |
526 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
527 | dccp_insert_option_ackvec(sk, skb)) | |
528 | return -1; | |
529 | ||
530 | if (dp->dccps_timestamp_echo != 0 && | |
531 | dccp_insert_option_timestamp_echo(sk, skb)) | |
532 | return -1; | |
7c657876 ACM |
533 | } |
534 | ||
507d37cf | 535 | if (dp->dccps_hc_rx_insert_options) { |
2d0817d1 ACM |
536 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
537 | return -1; | |
507d37cf ACM |
538 | dp->dccps_hc_rx_insert_options = 0; |
539 | } | |
7c657876 | 540 | |
afe00251 | 541 | /* Feature negotiation */ |
2d0817d1 ACM |
542 | /* Data packets can't do feat negotiation */ |
543 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && | |
544 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && | |
545 | dccp_insert_options_feat(sk, skb)) | |
546 | return -1; | |
afe00251 | 547 | |
89560b53 GR |
548 | /* |
549 | * Obtain RTT sample from Request/Response exchange. | |
550 | * This is currently used in CCID 3 initialisation. | |
551 | */ | |
552 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST && | |
553 | dccp_insert_option_timestamp(sk, skb)) | |
554 | return -1; | |
555 | ||
7c657876 ACM |
556 | /* XXX: insert other options when appropriate */ |
557 | ||
558 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
559 | /* The length of all options has to be a multiple of 4 */ | |
560 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
561 | ||
562 | if (padding != 0) { | |
563 | padding = 4 - padding; | |
564 | memset(skb_push(skb, padding), 0, padding); | |
565 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
566 | } | |
567 | } | |
2d0817d1 ACM |
568 | |
569 | return 0; | |
7c657876 | 570 | } |