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> | |
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 | |
a4bf3902 | 32 | void dccp_minisock_init(struct dccp_minisock *dmsk) |
7c657876 | 33 | { |
afb0a34d GR |
34 | dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window; |
35 | dmsk->dccpms_rx_ccid = sysctl_dccp_feat_rx_ccid; | |
36 | dmsk->dccpms_tx_ccid = sysctl_dccp_feat_tx_ccid; | |
37 | dmsk->dccpms_ack_ratio = sysctl_dccp_feat_ack_ratio; | |
38 | dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector; | |
39 | dmsk->dccpms_send_ndp_count = sysctl_dccp_feat_send_ndp_count; | |
7c657876 ACM |
40 | } |
41 | ||
42 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) | |
43 | { | |
44 | u32 value = 0; | |
45 | ||
46 | if (len > 3) | |
47 | value += *bf++ << 24; | |
48 | if (len > 2) | |
49 | value += *bf++ << 16; | |
50 | if (len > 1) | |
51 | value += *bf++ << 8; | |
52 | if (len > 0) | |
53 | value += *bf; | |
54 | ||
55 | return value; | |
56 | } | |
57 | ||
58 | int dccp_parse_options(struct sock *sk, struct sk_buff *skb) | |
59 | { | |
60 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 ACM |
61 | const struct dccp_hdr *dh = dccp_hdr(skb); |
62 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; | |
bdf13d20 | 63 | u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; |
7c657876 ACM |
64 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); |
65 | unsigned char *opt_ptr = options; | |
7690af3f ACM |
66 | const unsigned char *opt_end = (unsigned char *)dh + |
67 | (dh->dccph_doff * 4); | |
7c657876 ACM |
68 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
69 | unsigned char opt, len; | |
70 | unsigned char *value; | |
1c14ac0a | 71 | u32 elapsed_time; |
afe00251 AB |
72 | int rc; |
73 | int mandatory = 0; | |
7c657876 ACM |
74 | |
75 | memset(opt_recv, 0, sizeof(*opt_recv)); | |
76 | ||
fb950496 | 77 | opt = len = 0; |
7c657876 ACM |
78 | while (opt_ptr != opt_end) { |
79 | opt = *opt_ptr++; | |
80 | len = 0; | |
81 | value = NULL; | |
82 | ||
83 | /* Check if this isn't a single byte option */ | |
84 | if (opt > DCCPO_MAX_RESERVED) { | |
85 | if (opt_ptr == opt_end) | |
86 | goto out_invalid_option; | |
87 | ||
88 | len = *opt_ptr++; | |
89 | if (len < 3) | |
90 | goto out_invalid_option; | |
91 | /* | |
92 | * Remove the type and len fields, leaving | |
93 | * just the value size | |
94 | */ | |
95 | len -= 2; | |
96 | value = opt_ptr; | |
97 | opt_ptr += len; | |
98 | ||
99 | if (opt_ptr > opt_end) | |
100 | goto out_invalid_option; | |
101 | } | |
102 | ||
103 | switch (opt) { | |
104 | case DCCPO_PADDING: | |
105 | break; | |
afe00251 AB |
106 | case DCCPO_MANDATORY: |
107 | if (mandatory) | |
108 | goto out_invalid_option; | |
6df9424a ACM |
109 | if (pkt_type != DCCP_PKT_DATA) |
110 | mandatory = 1; | |
afe00251 | 111 | break; |
7c657876 ACM |
112 | case DCCPO_NDP_COUNT: |
113 | if (len > 3) | |
114 | goto out_invalid_option; | |
115 | ||
116 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
09dbc389 | 117 | dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), |
7690af3f | 118 | opt_recv->dccpor_ndp); |
7c657876 | 119 | break; |
afe00251 AB |
120 | case DCCPO_CHANGE_L: |
121 | /* fall through */ | |
122 | case DCCPO_CHANGE_R: | |
123 | if (len < 2) | |
124 | goto out_invalid_option; | |
125 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
126 | len - 1); | |
127 | /* | |
128 | * When there is a change error, change_recv is | |
129 | * responsible for dealing with it. i.e. reply with an | |
130 | * empty confirm. | |
131 | * If the change was mandatory, then we need to die. | |
132 | */ | |
133 | if (rc && mandatory) | |
134 | goto out_invalid_option; | |
135 | break; | |
136 | case DCCPO_CONFIRM_L: | |
137 | /* fall through */ | |
138 | case DCCPO_CONFIRM_R: | |
139 | if (len < 2) | |
140 | goto out_invalid_option; | |
141 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
142 | value + 1, len - 1)) | |
143 | goto out_invalid_option; | |
144 | break; | |
7c657876 | 145 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 146 | case DCCPO_ACK_VECTOR_1: |
7c657876 | 147 | if (pkt_type == DCCP_PKT_DATA) |
e5a6de91 | 148 | break; |
7c657876 | 149 | |
a4bf3902 | 150 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
bdf13d20 | 151 | dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) |
ae31c339 | 152 | goto out_invalid_option; |
7c657876 ACM |
153 | break; |
154 | case DCCPO_TIMESTAMP: | |
155 | if (len != 4) | |
156 | goto out_invalid_option; | |
157 | ||
60fe62e7 | 158 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
7c657876 ACM |
159 | |
160 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
19ac2146 | 161 | dp->dccps_timestamp_time = ktime_get_real(); |
7c657876 | 162 | |
09dbc389 GR |
163 | dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", |
164 | dccp_role(sk), opt_recv->dccpor_timestamp, | |
f6ccf554 | 165 | (unsigned long long) |
7c657876 ACM |
166 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
167 | break; | |
168 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 169 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
170 | goto out_invalid_option; |
171 | ||
60fe62e7 | 172 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
7c657876 | 173 | |
09dbc389 | 174 | dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " |
f73f7097 | 175 | "ackno=%llu", dccp_role(sk), |
7690af3f | 176 | opt_recv->dccpor_timestamp_echo, |
f6ccf554 DM |
177 | len + 2, |
178 | (unsigned long long) | |
1bc09869 IM |
179 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
180 | ||
1bc09869 | 181 | |
f73f7097 GR |
182 | if (len == 4) { |
183 | dccp_pr_debug_cat("\n"); | |
1c14ac0a | 184 | break; |
f73f7097 | 185 | } |
1c14ac0a ACM |
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 | 191 | |
f73f7097 GR |
192 | dccp_pr_debug_cat(", ELAPSED_TIME=%d\n", elapsed_time); |
193 | ||
1c14ac0a ACM |
194 | /* Give precedence to the biggest ELAPSED_TIME */ |
195 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
196 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
7c657876 ACM |
197 | break; |
198 | case DCCPO_ELAPSED_TIME: | |
1bc09869 | 199 | if (len != 2 && len != 4) |
7c657876 ACM |
200 | goto out_invalid_option; |
201 | ||
202 | if (pkt_type == DCCP_PKT_DATA) | |
203 | continue; | |
1bc09869 IM |
204 | |
205 | if (len == 2) | |
60fe62e7 | 206 | elapsed_time = ntohs(*(__be16 *)value); |
1bc09869 | 207 | else |
60fe62e7 | 208 | elapsed_time = ntohl(*(__be32 *)value); |
1c14ac0a ACM |
209 | |
210 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
211 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 212 | |
09dbc389 GR |
213 | dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", |
214 | dccp_role(sk), elapsed_time); | |
7c657876 ACM |
215 | break; |
216 | /* | |
0e64e94e | 217 | * From RFC 4340, sec. 10.3: |
7c657876 | 218 | * |
7690af3f ACM |
219 | * Option numbers 128 through 191 are for |
220 | * options sent from the HC-Sender to the | |
221 | * HC-Receiver; option numbers 192 through 255 | |
222 | * are for options sent from the HC-Receiver to | |
223 | * the HC-Sender. | |
7c657876 ACM |
224 | */ |
225 | case 128 ... 191: { | |
226 | const u16 idx = value - options; | |
227 | ||
7690af3f ACM |
228 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
229 | opt, len, idx, | |
230 | value) != 0) | |
7c657876 ACM |
231 | goto out_invalid_option; |
232 | } | |
233 | break; | |
234 | case 192 ... 255: { | |
235 | const u16 idx = value - options; | |
236 | ||
7690af3f ACM |
237 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
238 | opt, len, idx, | |
239 | value) != 0) | |
7c657876 ACM |
240 | goto out_invalid_option; |
241 | } | |
242 | break; | |
243 | default: | |
59348b19 GR |
244 | DCCP_CRIT("DCCP(%p): option %d(len=%d) not " |
245 | "implemented, ignoring", sk, opt, len); | |
7c657876 | 246 | break; |
c9eaf173 | 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; | |
59348b19 | 262 | DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); |
7c657876 ACM |
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 | |
2d0817d1 | 373 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 374 | { |
23474895 | 375 | __be32 now = htonl(((suseconds_t)ktime_to_us(ktime_get_real())) / 10); |
1bc09869 IM |
376 | /* yes this will overflow but that is the point as we want a |
377 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
378 | ||
2d0817d1 | 379 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
7c657876 ACM |
380 | } |
381 | ||
d4b81ff7 ACM |
382 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
383 | ||
2d0817d1 ACM |
384 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
385 | struct sk_buff *skb) | |
7c657876 ACM |
386 | { |
387 | struct dccp_sock *dp = dccp_sk(sk); | |
60fe62e7 | 388 | __be32 tstamp_echo; |
b0e56780 | 389 | int len, elapsed_time_len; |
7c657876 | 390 | unsigned char *to; |
19ac2146 ACM |
391 | const suseconds_t delta = ktime_us_delta(ktime_get_real(), |
392 | dp->dccps_timestamp_time); | |
393 | u32 elapsed_time = delta / 10; | |
b0e56780 ACM |
394 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
395 | len = 6 + elapsed_time_len; | |
396 | ||
2d0817d1 ACM |
397 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
398 | return -1; | |
7c657876 ACM |
399 | |
400 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
401 | ||
402 | to = skb_push(skb, len); | |
403 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
404 | *to++ = len; | |
405 | ||
406 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
407 | memcpy(to, &tstamp_echo, 4); | |
408 | to += 4; | |
afe00251 | 409 | |
1bc09869 | 410 | if (elapsed_time_len == 2) { |
60fe62e7 | 411 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
412 | memcpy(to, &var16, 2); |
413 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 414 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
415 | memcpy(to, &var32, 4); |
416 | } | |
7c657876 | 417 | |
7c657876 | 418 | dp->dccps_timestamp_echo = 0; |
19ac2146 | 419 | dp->dccps_timestamp_time = ktime_set(0, 0); |
2d0817d1 | 420 | return 0; |
7c657876 ACM |
421 | } |
422 | ||
afe00251 | 423 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
c9eaf173 | 424 | u8 *val, u8 len) |
afe00251 AB |
425 | { |
426 | u8 *to; | |
427 | ||
428 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
59348b19 | 429 | DCCP_WARN("packet too small for feature %d option!\n", feat); |
afe00251 AB |
430 | return -1; |
431 | } | |
432 | ||
433 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
434 | ||
435 | to = skb_push(skb, len + 3); | |
436 | *to++ = type; | |
437 | *to++ = len + 3; | |
438 | *to++ = feat; | |
439 | ||
440 | if (len) | |
441 | memcpy(to, val, len); | |
afe00251 | 442 | |
c02fdc0e GR |
443 | dccp_pr_debug("%s(%s (%d), ...), length %d\n", |
444 | dccp_feat_typename(type), | |
445 | dccp_feat_name(feat), feat, len); | |
afe00251 AB |
446 | return 0; |
447 | } | |
448 | ||
2d0817d1 | 449 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
afe00251 AB |
450 | { |
451 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 452 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
453 | struct dccp_opt_pend *opt, *next; |
454 | int change = 0; | |
455 | ||
456 | /* confirm any options [NN opts] */ | |
a4bf3902 | 457 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
458 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
459 | opt->dccpop_feat, opt->dccpop_val, | |
460 | opt->dccpop_len); | |
461 | /* fear empty confirms */ | |
462 | if (opt->dccpop_val) | |
463 | kfree(opt->dccpop_val); | |
464 | kfree(opt); | |
465 | } | |
a4bf3902 | 466 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
467 | |
468 | /* see which features we need to send */ | |
a4bf3902 | 469 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
470 | /* see if we need to send any confirm */ |
471 | if (opt->dccpop_sc) { | |
472 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
473 | opt->dccpop_feat, | |
474 | opt->dccpop_sc->dccpoc_val, | |
475 | opt->dccpop_sc->dccpoc_len); | |
476 | ||
477 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
478 | kfree(opt->dccpop_sc->dccpoc_val); | |
479 | kfree(opt->dccpop_sc); | |
480 | opt->dccpop_sc = NULL; | |
481 | } | |
482 | ||
483 | /* any option not confirmed, re-send it */ | |
484 | if (!opt->dccpop_conf) { | |
485 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
486 | opt->dccpop_feat, opt->dccpop_val, | |
487 | opt->dccpop_len); | |
488 | change++; | |
489 | } | |
490 | } | |
491 | ||
492 | /* Retransmit timer. | |
493 | * If this is the master listening sock, we don't set a timer on it. It | |
494 | * should be fine because if the dude doesn't receive our RESPONSE | |
495 | * [which will contain the CHANGE] he will send another REQUEST which | |
496 | * will "retrnasmit" the change. | |
497 | */ | |
498 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
499 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
500 | ||
501 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
502 | * only when sending new stuff i guess. Currently the timer | |
503 | * never backs off because on re-transmission it just resets it! | |
504 | */ | |
505 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
506 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
507 | } | |
2d0817d1 ACM |
508 | |
509 | return 0; | |
afe00251 AB |
510 | } |
511 | ||
2d0817d1 | 512 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
513 | { |
514 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 515 | struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 ACM |
516 | |
517 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
518 | ||
a4bf3902 | 519 | if (dmsk->dccpms_send_ndp_count && |
2d0817d1 ACM |
520 | dccp_insert_option_ndp(sk, skb)) |
521 | return -1; | |
7c657876 ACM |
522 | |
523 | if (!dccp_packet_without_ack(skb)) { | |
a4bf3902 | 524 | if (dmsk->dccpms_send_ack_vector && |
2d0817d1 ACM |
525 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
526 | dccp_insert_option_ackvec(sk, skb)) | |
527 | return -1; | |
528 | ||
529 | if (dp->dccps_timestamp_echo != 0 && | |
530 | dccp_insert_option_timestamp_echo(sk, skb)) | |
531 | return -1; | |
7c657876 ACM |
532 | } |
533 | ||
507d37cf | 534 | if (dp->dccps_hc_rx_insert_options) { |
2d0817d1 ACM |
535 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
536 | return -1; | |
507d37cf ACM |
537 | dp->dccps_hc_rx_insert_options = 0; |
538 | } | |
7c657876 | 539 | |
afe00251 | 540 | /* Feature negotiation */ |
2d0817d1 ACM |
541 | /* Data packets can't do feat negotiation */ |
542 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && | |
543 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && | |
544 | dccp_insert_options_feat(sk, skb)) | |
545 | return -1; | |
afe00251 | 546 | |
89560b53 GR |
547 | /* |
548 | * Obtain RTT sample from Request/Response exchange. | |
549 | * This is currently used in CCID 3 initialisation. | |
550 | */ | |
551 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST && | |
552 | dccp_insert_option_timestamp(sk, skb)) | |
553 | return -1; | |
554 | ||
7c657876 ACM |
555 | /* XXX: insert other options when appropriate */ |
556 | ||
557 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
558 | /* The length of all options has to be a multiple of 4 */ | |
559 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
560 | ||
561 | if (padding != 0) { | |
562 | padding = 4 - padding; | |
563 | memset(skb_push(skb, padding), 0, padding); | |
564 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
565 | } | |
566 | } | |
2d0817d1 ACM |
567 | |
568 | return 0; | |
7c657876 | 569 | } |