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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 | */ | |
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 | |
e55d912f ACM |
25 | int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; |
26 | int dccp_feat_default_rx_ccid = DCCPF_INITIAL_CCID; | |
27 | int dccp_feat_default_tx_ccid = DCCPF_INITIAL_CCID; | |
28 | int dccp_feat_default_ack_ratio = DCCPF_INITIAL_ACK_RATIO; | |
29 | int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; | |
30 | int dccp_feat_default_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; | |
7c657876 | 31 | |
4b79f0af IM |
32 | EXPORT_SYMBOL_GPL(dccp_feat_default_sequence_window); |
33 | ||
a4bf3902 | 34 | void dccp_minisock_init(struct dccp_minisock *dmsk) |
7c657876 | 35 | { |
a4bf3902 ACM |
36 | dmsk->dccpms_sequence_window = dccp_feat_default_sequence_window; |
37 | dmsk->dccpms_rx_ccid = dccp_feat_default_rx_ccid; | |
38 | dmsk->dccpms_tx_ccid = dccp_feat_default_tx_ccid; | |
39 | dmsk->dccpms_ack_ratio = dccp_feat_default_ack_ratio; | |
40 | dmsk->dccpms_send_ack_vector = dccp_feat_default_send_ack_vector; | |
41 | dmsk->dccpms_send_ndp_count = dccp_feat_default_send_ndp_count; | |
7c657876 ACM |
42 | } |
43 | ||
44 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) | |
45 | { | |
46 | u32 value = 0; | |
47 | ||
48 | if (len > 3) | |
49 | value += *bf++ << 24; | |
50 | if (len > 2) | |
51 | value += *bf++ << 16; | |
52 | if (len > 1) | |
53 | value += *bf++ << 8; | |
54 | if (len > 0) | |
55 | value += *bf; | |
56 | ||
57 | return value; | |
58 | } | |
59 | ||
60 | int dccp_parse_options(struct sock *sk, struct sk_buff *skb) | |
61 | { | |
62 | struct dccp_sock *dp = dccp_sk(sk); | |
725ba8ee | 63 | #ifdef CONFIG_IP_DCCP_DEBUG |
7690af3f ACM |
64 | const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? |
65 | "CLIENT rx opt: " : "server rx opt: "; | |
7c657876 ACM |
66 | #endif |
67 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
68 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; | |
69 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); | |
70 | unsigned char *opt_ptr = options; | |
7690af3f ACM |
71 | const unsigned char *opt_end = (unsigned char *)dh + |
72 | (dh->dccph_doff * 4); | |
7c657876 ACM |
73 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
74 | unsigned char opt, len; | |
75 | unsigned char *value; | |
1c14ac0a | 76 | u32 elapsed_time; |
afe00251 AB |
77 | int rc; |
78 | int mandatory = 0; | |
7c657876 ACM |
79 | |
80 | memset(opt_recv, 0, sizeof(*opt_recv)); | |
81 | ||
fb950496 | 82 | opt = len = 0; |
7c657876 ACM |
83 | while (opt_ptr != opt_end) { |
84 | opt = *opt_ptr++; | |
85 | len = 0; | |
86 | value = NULL; | |
87 | ||
88 | /* Check if this isn't a single byte option */ | |
89 | if (opt > DCCPO_MAX_RESERVED) { | |
90 | if (opt_ptr == opt_end) | |
91 | goto out_invalid_option; | |
92 | ||
93 | len = *opt_ptr++; | |
94 | if (len < 3) | |
95 | goto out_invalid_option; | |
96 | /* | |
97 | * Remove the type and len fields, leaving | |
98 | * just the value size | |
99 | */ | |
100 | len -= 2; | |
101 | value = opt_ptr; | |
102 | opt_ptr += len; | |
103 | ||
104 | if (opt_ptr > opt_end) | |
105 | goto out_invalid_option; | |
106 | } | |
107 | ||
108 | switch (opt) { | |
109 | case DCCPO_PADDING: | |
110 | break; | |
afe00251 AB |
111 | case DCCPO_MANDATORY: |
112 | if (mandatory) | |
113 | goto out_invalid_option; | |
6df9424a ACM |
114 | if (pkt_type != DCCP_PKT_DATA) |
115 | mandatory = 1; | |
afe00251 | 116 | break; |
7c657876 ACM |
117 | case DCCPO_NDP_COUNT: |
118 | if (len > 3) | |
119 | goto out_invalid_option; | |
120 | ||
121 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
7690af3f ACM |
122 | dccp_pr_debug("%sNDP count=%d\n", debug_prefix, |
123 | opt_recv->dccpor_ndp); | |
7c657876 | 124 | break; |
afe00251 AB |
125 | case DCCPO_CHANGE_L: |
126 | /* fall through */ | |
127 | case DCCPO_CHANGE_R: | |
128 | if (len < 2) | |
129 | goto out_invalid_option; | |
130 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
131 | len - 1); | |
132 | /* | |
133 | * When there is a change error, change_recv is | |
134 | * responsible for dealing with it. i.e. reply with an | |
135 | * empty confirm. | |
136 | * If the change was mandatory, then we need to die. | |
137 | */ | |
138 | if (rc && mandatory) | |
139 | goto out_invalid_option; | |
140 | break; | |
141 | case DCCPO_CONFIRM_L: | |
142 | /* fall through */ | |
143 | case DCCPO_CONFIRM_R: | |
144 | if (len < 2) | |
145 | goto out_invalid_option; | |
146 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
147 | value + 1, len - 1)) | |
148 | goto out_invalid_option; | |
149 | break; | |
7c657876 | 150 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 151 | case DCCPO_ACK_VECTOR_1: |
7c657876 | 152 | if (pkt_type == DCCP_PKT_DATA) |
e5a6de91 | 153 | break; |
7c657876 | 154 | |
a4bf3902 | 155 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
ae31c339 ACM |
156 | dccp_ackvec_parse(sk, skb, opt, value, len)) |
157 | goto out_invalid_option; | |
7c657876 ACM |
158 | break; |
159 | case DCCPO_TIMESTAMP: | |
160 | if (len != 4) | |
161 | goto out_invalid_option; | |
162 | ||
60fe62e7 | 163 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
7c657876 ACM |
164 | |
165 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
b0e56780 | 166 | dccp_timestamp(sk, &dp->dccps_timestamp_time); |
7c657876 ACM |
167 | |
168 | dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n", | |
169 | debug_prefix, opt_recv->dccpor_timestamp, | |
f6ccf554 | 170 | (unsigned long long) |
7c657876 ACM |
171 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
172 | break; | |
173 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 174 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
175 | goto out_invalid_option; |
176 | ||
60fe62e7 | 177 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
7c657876 | 178 | |
1bc09869 | 179 | dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ", |
7690af3f ACM |
180 | debug_prefix, |
181 | opt_recv->dccpor_timestamp_echo, | |
f6ccf554 DM |
182 | len + 2, |
183 | (unsigned long long) | |
1bc09869 IM |
184 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
185 | ||
1bc09869 | 186 | |
1c14ac0a ACM |
187 | if (len == 4) |
188 | break; | |
189 | ||
190 | if (len == 6) | |
60fe62e7 | 191 | elapsed_time = ntohs(*(__be16 *)(value + 4)); |
1c14ac0a | 192 | else |
60fe62e7 | 193 | elapsed_time = ntohl(*(__be32 *)(value + 4)); |
1c14ac0a ACM |
194 | |
195 | /* Give precedence to the biggest ELAPSED_TIME */ | |
196 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
197 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
7c657876 ACM |
198 | break; |
199 | case DCCPO_ELAPSED_TIME: | |
1bc09869 | 200 | if (len != 2 && len != 4) |
7c657876 ACM |
201 | goto out_invalid_option; |
202 | ||
203 | if (pkt_type == DCCP_PKT_DATA) | |
204 | continue; | |
1bc09869 IM |
205 | |
206 | if (len == 2) | |
60fe62e7 | 207 | elapsed_time = ntohs(*(__be16 *)value); |
1bc09869 | 208 | else |
60fe62e7 | 209 | elapsed_time = ntohl(*(__be32 *)value); |
1c14ac0a ACM |
210 | |
211 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
212 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 213 | |
7c657876 | 214 | dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix, |
1c14ac0a | 215 | elapsed_time); |
7c657876 ACM |
216 | break; |
217 | /* | |
218 | * From draft-ietf-dccp-spec-11.txt: | |
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: | |
7690af3f ACM |
245 | pr_info("DCCP(%p): option %d(len=%d) not " |
246 | "implemented, ignoring\n", | |
7c657876 ACM |
247 | sk, opt, len); |
248 | break; | |
249 | } | |
afe00251 AB |
250 | |
251 | if (opt != DCCPO_MANDATORY) | |
252 | mandatory = 0; | |
7c657876 ACM |
253 | } |
254 | ||
6df9424a ACM |
255 | /* mandatory was the last byte in option list -> reset connection */ |
256 | if (mandatory) | |
257 | goto out_invalid_option; | |
258 | ||
7c657876 ACM |
259 | return 0; |
260 | ||
261 | out_invalid_option: | |
262 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); | |
263 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; | |
264 | pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); | |
265 | return -1; | |
266 | } | |
267 | ||
b61fafc4 ACM |
268 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
269 | ||
7c657876 ACM |
270 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
271 | const unsigned int len) | |
272 | { | |
273 | if (len > 3) | |
274 | *to++ = (value & 0xFF000000) >> 24; | |
275 | if (len > 2) | |
276 | *to++ = (value & 0xFF0000) >> 16; | |
277 | if (len > 1) | |
278 | *to++ = (value & 0xFF00) >> 8; | |
279 | if (len > 0) | |
280 | *to++ = (value & 0xFF); | |
281 | } | |
282 | ||
283 | static inline int dccp_ndp_len(const int ndp) | |
284 | { | |
285 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; | |
286 | } | |
287 | ||
2d0817d1 | 288 | int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
289 | const unsigned char option, |
290 | const void *value, const unsigned char len) | |
291 | { | |
292 | unsigned char *to; | |
293 | ||
2d0817d1 ACM |
294 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
295 | return -1; | |
7c657876 ACM |
296 | |
297 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; | |
298 | ||
299 | to = skb_push(skb, len + 2); | |
300 | *to++ = option; | |
301 | *to++ = len + 2; | |
302 | ||
303 | memcpy(to, value, len); | |
2d0817d1 | 304 | return 0; |
7c657876 ACM |
305 | } |
306 | ||
307 | EXPORT_SYMBOL_GPL(dccp_insert_option); | |
308 | ||
2d0817d1 | 309 | static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
310 | { |
311 | struct dccp_sock *dp = dccp_sk(sk); | |
312 | int ndp = dp->dccps_ndp_count; | |
313 | ||
314 | if (dccp_non_data_packet(skb)) | |
315 | ++dp->dccps_ndp_count; | |
316 | else | |
317 | dp->dccps_ndp_count = 0; | |
318 | ||
319 | if (ndp > 0) { | |
320 | unsigned char *ptr; | |
321 | const int ndp_len = dccp_ndp_len(ndp); | |
322 | const int len = ndp_len + 2; | |
323 | ||
324 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) | |
2d0817d1 | 325 | return -1; |
7c657876 ACM |
326 | |
327 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
328 | ||
329 | ptr = skb_push(skb, len); | |
330 | *ptr++ = DCCPO_NDP_COUNT; | |
331 | *ptr++ = len; | |
332 | dccp_encode_value_var(ndp, ptr, ndp_len); | |
333 | } | |
2d0817d1 ACM |
334 | |
335 | return 0; | |
7c657876 ACM |
336 | } |
337 | ||
338 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) | |
339 | { | |
b1c9fe7b | 340 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
7c657876 ACM |
341 | } |
342 | ||
2d0817d1 ACM |
343 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
344 | u32 elapsed_time) | |
7c657876 | 345 | { |
7c657876 ACM |
346 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
347 | const int len = 2 + elapsed_time_len; | |
348 | unsigned char *to; | |
349 | ||
1bc09869 | 350 | if (elapsed_time_len == 0) |
2d0817d1 | 351 | return 0; |
7c657876 | 352 | |
2d0817d1 ACM |
353 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
354 | return -1; | |
7c657876 ACM |
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 | 369 | |
2d0817d1 | 370 | return 0; |
7c657876 ACM |
371 | } |
372 | ||
d4b81ff7 | 373 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
7c657876 | 374 | |
b0e56780 ACM |
375 | void dccp_timestamp(const struct sock *sk, struct timeval *tv) |
376 | { | |
377 | const struct dccp_sock *dp = dccp_sk(sk); | |
378 | ||
379 | do_gettimeofday(tv); | |
380 | tv->tv_sec -= dp->dccps_epoch.tv_sec; | |
381 | tv->tv_usec -= dp->dccps_epoch.tv_usec; | |
382 | ||
383 | while (tv->tv_usec < 0) { | |
384 | tv->tv_sec--; | |
385 | tv->tv_usec += USEC_PER_SEC; | |
386 | } | |
387 | } | |
388 | ||
389 | EXPORT_SYMBOL_GPL(dccp_timestamp); | |
390 | ||
2d0817d1 | 391 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 392 | { |
1bc09869 | 393 | struct timeval tv; |
60fe62e7 | 394 | __be32 now; |
afe00251 | 395 | |
b0e56780 | 396 | dccp_timestamp(sk, &tv); |
60fe62e7 | 397 | now = htonl(timeval_usecs(&tv) / 10); |
1bc09869 IM |
398 | /* yes this will overflow but that is the point as we want a |
399 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
400 | ||
2d0817d1 | 401 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
7c657876 ACM |
402 | } |
403 | ||
d4b81ff7 ACM |
404 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
405 | ||
2d0817d1 ACM |
406 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
407 | struct sk_buff *skb) | |
7c657876 ACM |
408 | { |
409 | struct dccp_sock *dp = dccp_sk(sk); | |
b0e56780 | 410 | struct timeval now; |
60fe62e7 | 411 | __be32 tstamp_echo; |
b0e56780 ACM |
412 | u32 elapsed_time; |
413 | int len, elapsed_time_len; | |
7c657876 ACM |
414 | unsigned char *to; |
415 | ||
b0e56780 ACM |
416 | dccp_timestamp(sk, &now); |
417 | elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; | |
418 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); | |
419 | len = 6 + elapsed_time_len; | |
420 | ||
2d0817d1 ACM |
421 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
422 | return -1; | |
7c657876 ACM |
423 | |
424 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
425 | ||
426 | to = skb_push(skb, len); | |
427 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
428 | *to++ = len; | |
429 | ||
430 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
431 | memcpy(to, &tstamp_echo, 4); | |
432 | to += 4; | |
afe00251 | 433 | |
1bc09869 | 434 | if (elapsed_time_len == 2) { |
60fe62e7 | 435 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
436 | memcpy(to, &var16, 2); |
437 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 438 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
439 | memcpy(to, &var32, 4); |
440 | } | |
7c657876 | 441 | |
7c657876 | 442 | dp->dccps_timestamp_echo = 0; |
1bc09869 IM |
443 | dp->dccps_timestamp_time.tv_sec = 0; |
444 | dp->dccps_timestamp_time.tv_usec = 0; | |
2d0817d1 | 445 | return 0; |
7c657876 ACM |
446 | } |
447 | ||
afe00251 AB |
448 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
449 | u8 *val, u8 len) | |
450 | { | |
451 | u8 *to; | |
452 | ||
453 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
454 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" | |
455 | " to insert feature %d option!\n", feat); | |
456 | return -1; | |
457 | } | |
458 | ||
459 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
460 | ||
461 | to = skb_push(skb, len + 3); | |
462 | *to++ = type; | |
463 | *to++ = len + 3; | |
464 | *to++ = feat; | |
465 | ||
466 | if (len) | |
467 | memcpy(to, val, len); | |
468 | dccp_pr_debug("option %d feat %d len %d\n", type, feat, len); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
2d0817d1 | 473 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
afe00251 AB |
474 | { |
475 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 476 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
477 | struct dccp_opt_pend *opt, *next; |
478 | int change = 0; | |
479 | ||
480 | /* confirm any options [NN opts] */ | |
a4bf3902 | 481 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
482 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
483 | opt->dccpop_feat, opt->dccpop_val, | |
484 | opt->dccpop_len); | |
485 | /* fear empty confirms */ | |
486 | if (opt->dccpop_val) | |
487 | kfree(opt->dccpop_val); | |
488 | kfree(opt); | |
489 | } | |
a4bf3902 | 490 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
491 | |
492 | /* see which features we need to send */ | |
a4bf3902 | 493 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
494 | /* see if we need to send any confirm */ |
495 | if (opt->dccpop_sc) { | |
496 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
497 | opt->dccpop_feat, | |
498 | opt->dccpop_sc->dccpoc_val, | |
499 | opt->dccpop_sc->dccpoc_len); | |
500 | ||
501 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
502 | kfree(opt->dccpop_sc->dccpoc_val); | |
503 | kfree(opt->dccpop_sc); | |
504 | opt->dccpop_sc = NULL; | |
505 | } | |
506 | ||
507 | /* any option not confirmed, re-send it */ | |
508 | if (!opt->dccpop_conf) { | |
509 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
510 | opt->dccpop_feat, opt->dccpop_val, | |
511 | opt->dccpop_len); | |
512 | change++; | |
513 | } | |
514 | } | |
515 | ||
516 | /* Retransmit timer. | |
517 | * If this is the master listening sock, we don't set a timer on it. It | |
518 | * should be fine because if the dude doesn't receive our RESPONSE | |
519 | * [which will contain the CHANGE] he will send another REQUEST which | |
520 | * will "retrnasmit" the change. | |
521 | */ | |
522 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
523 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
524 | ||
525 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
526 | * only when sending new stuff i guess. Currently the timer | |
527 | * never backs off because on re-transmission it just resets it! | |
528 | */ | |
529 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
530 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
531 | } | |
2d0817d1 ACM |
532 | |
533 | return 0; | |
afe00251 AB |
534 | } |
535 | ||
2d0817d1 | 536 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
537 | { |
538 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 539 | struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 ACM |
540 | |
541 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
542 | ||
a4bf3902 | 543 | if (dmsk->dccpms_send_ndp_count && |
2d0817d1 ACM |
544 | dccp_insert_option_ndp(sk, skb)) |
545 | return -1; | |
7c657876 ACM |
546 | |
547 | if (!dccp_packet_without_ack(skb)) { | |
a4bf3902 | 548 | if (dmsk->dccpms_send_ack_vector && |
2d0817d1 ACM |
549 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
550 | dccp_insert_option_ackvec(sk, skb)) | |
551 | return -1; | |
552 | ||
553 | if (dp->dccps_timestamp_echo != 0 && | |
554 | dccp_insert_option_timestamp_echo(sk, skb)) | |
555 | return -1; | |
7c657876 ACM |
556 | } |
557 | ||
507d37cf | 558 | if (dp->dccps_hc_rx_insert_options) { |
2d0817d1 ACM |
559 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
560 | return -1; | |
507d37cf ACM |
561 | dp->dccps_hc_rx_insert_options = 0; |
562 | } | |
563 | if (dp->dccps_hc_tx_insert_options) { | |
2d0817d1 ACM |
564 | if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb)) |
565 | return -1; | |
507d37cf ACM |
566 | dp->dccps_hc_tx_insert_options = 0; |
567 | } | |
7c657876 | 568 | |
afe00251 | 569 | /* Feature negotiation */ |
2d0817d1 ACM |
570 | /* Data packets can't do feat negotiation */ |
571 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && | |
572 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && | |
573 | dccp_insert_options_feat(sk, skb)) | |
574 | return -1; | |
afe00251 | 575 | |
7c657876 ACM |
576 | /* XXX: insert other options when appropriate */ |
577 | ||
578 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
579 | /* The length of all options has to be a multiple of 4 */ | |
580 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
581 | ||
582 | if (padding != 0) { | |
583 | padding = 4 - padding; | |
584 | memset(skb_push(skb, padding), 0, padding); | |
585 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
586 | } | |
587 | } | |
2d0817d1 ACM |
588 | |
589 | return 0; | |
7c657876 | 590 | } |