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 | |
afb0a34d | 32 | EXPORT_SYMBOL_GPL(sysctl_dccp_feat_sequence_window); |
4b79f0af | 33 | |
a4bf3902 | 34 | void dccp_minisock_init(struct dccp_minisock *dmsk) |
7c657876 | 35 | { |
afb0a34d GR |
36 | dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window; |
37 | dmsk->dccpms_rx_ccid = sysctl_dccp_feat_rx_ccid; | |
38 | dmsk->dccpms_tx_ccid = sysctl_dccp_feat_tx_ccid; | |
39 | dmsk->dccpms_ack_ratio = sysctl_dccp_feat_ack_ratio; | |
40 | dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector; | |
41 | dmsk->dccpms_send_ndp_count = sysctl_dccp_feat_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); | |
7c657876 ACM |
63 | const struct dccp_hdr *dh = dccp_hdr(skb); |
64 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; | |
bdf13d20 | 65 | u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; |
7c657876 ACM |
66 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); |
67 | unsigned char *opt_ptr = options; | |
7690af3f ACM |
68 | const unsigned char *opt_end = (unsigned char *)dh + |
69 | (dh->dccph_doff * 4); | |
7c657876 ACM |
70 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
71 | unsigned char opt, len; | |
72 | unsigned char *value; | |
1c14ac0a | 73 | u32 elapsed_time; |
afe00251 AB |
74 | int rc; |
75 | int mandatory = 0; | |
7c657876 ACM |
76 | |
77 | memset(opt_recv, 0, sizeof(*opt_recv)); | |
78 | ||
fb950496 | 79 | opt = len = 0; |
7c657876 ACM |
80 | while (opt_ptr != opt_end) { |
81 | opt = *opt_ptr++; | |
82 | len = 0; | |
83 | value = NULL; | |
84 | ||
85 | /* Check if this isn't a single byte option */ | |
86 | if (opt > DCCPO_MAX_RESERVED) { | |
87 | if (opt_ptr == opt_end) | |
88 | goto out_invalid_option; | |
89 | ||
90 | len = *opt_ptr++; | |
91 | if (len < 3) | |
92 | goto out_invalid_option; | |
93 | /* | |
94 | * Remove the type and len fields, leaving | |
95 | * just the value size | |
96 | */ | |
97 | len -= 2; | |
98 | value = opt_ptr; | |
99 | opt_ptr += len; | |
100 | ||
101 | if (opt_ptr > opt_end) | |
102 | goto out_invalid_option; | |
103 | } | |
104 | ||
105 | switch (opt) { | |
106 | case DCCPO_PADDING: | |
107 | break; | |
afe00251 AB |
108 | case DCCPO_MANDATORY: |
109 | if (mandatory) | |
110 | goto out_invalid_option; | |
6df9424a ACM |
111 | if (pkt_type != DCCP_PKT_DATA) |
112 | mandatory = 1; | |
afe00251 | 113 | break; |
7c657876 ACM |
114 | case DCCPO_NDP_COUNT: |
115 | if (len > 3) | |
116 | goto out_invalid_option; | |
117 | ||
118 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); | |
09dbc389 | 119 | dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), |
7690af3f | 120 | opt_recv->dccpor_ndp); |
7c657876 | 121 | break; |
afe00251 AB |
122 | case DCCPO_CHANGE_L: |
123 | /* fall through */ | |
124 | case DCCPO_CHANGE_R: | |
125 | if (len < 2) | |
126 | goto out_invalid_option; | |
127 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, | |
128 | len - 1); | |
129 | /* | |
130 | * When there is a change error, change_recv is | |
131 | * responsible for dealing with it. i.e. reply with an | |
132 | * empty confirm. | |
133 | * If the change was mandatory, then we need to die. | |
134 | */ | |
135 | if (rc && mandatory) | |
136 | goto out_invalid_option; | |
137 | break; | |
138 | case DCCPO_CONFIRM_L: | |
139 | /* fall through */ | |
140 | case DCCPO_CONFIRM_R: | |
141 | if (len < 2) | |
142 | goto out_invalid_option; | |
143 | if (dccp_feat_confirm_recv(sk, opt, *value, | |
144 | value + 1, len - 1)) | |
145 | goto out_invalid_option; | |
146 | break; | |
7c657876 | 147 | case DCCPO_ACK_VECTOR_0: |
ae31c339 | 148 | case DCCPO_ACK_VECTOR_1: |
7c657876 | 149 | if (pkt_type == DCCP_PKT_DATA) |
e5a6de91 | 150 | break; |
7c657876 | 151 | |
a4bf3902 | 152 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
bdf13d20 | 153 | dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) |
ae31c339 | 154 | goto out_invalid_option; |
7c657876 ACM |
155 | break; |
156 | case DCCPO_TIMESTAMP: | |
157 | if (len != 4) | |
158 | goto out_invalid_option; | |
159 | ||
60fe62e7 | 160 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
7c657876 ACM |
161 | |
162 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; | |
b0e56780 | 163 | dccp_timestamp(sk, &dp->dccps_timestamp_time); |
7c657876 | 164 | |
09dbc389 GR |
165 | dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", |
166 | dccp_role(sk), opt_recv->dccpor_timestamp, | |
f6ccf554 | 167 | (unsigned long long) |
7c657876 ACM |
168 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
169 | break; | |
170 | case DCCPO_TIMESTAMP_ECHO: | |
1bc09869 | 171 | if (len != 4 && len != 6 && len != 8) |
7c657876 ACM |
172 | goto out_invalid_option; |
173 | ||
60fe62e7 | 174 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
7c657876 | 175 | |
09dbc389 GR |
176 | dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " |
177 | "ackno=%llu, ", dccp_role(sk), | |
7690af3f | 178 | opt_recv->dccpor_timestamp_echo, |
f6ccf554 DM |
179 | len + 2, |
180 | (unsigned long long) | |
1bc09869 IM |
181 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
182 | ||
1bc09869 | 183 | |
1c14ac0a ACM |
184 | if (len == 4) |
185 | break; | |
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 ACM |
191 | |
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 IM |
202 | |
203 | if (len == 2) | |
60fe62e7 | 204 | elapsed_time = ntohs(*(__be16 *)value); |
1bc09869 | 205 | else |
60fe62e7 | 206 | elapsed_time = ntohl(*(__be32 *)value); |
1c14ac0a ACM |
207 | |
208 | if (elapsed_time > opt_recv->dccpor_elapsed_time) | |
209 | opt_recv->dccpor_elapsed_time = elapsed_time; | |
1bc09869 | 210 | |
09dbc389 GR |
211 | dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", |
212 | dccp_role(sk), elapsed_time); | |
7c657876 ACM |
213 | break; |
214 | /* | |
0e64e94e | 215 | * From RFC 4340, sec. 10.3: |
7c657876 | 216 | * |
7690af3f ACM |
217 | * Option numbers 128 through 191 are for |
218 | * options sent from the HC-Sender to the | |
219 | * HC-Receiver; option numbers 192 through 255 | |
220 | * are for options sent from the HC-Receiver to | |
221 | * the HC-Sender. | |
7c657876 ACM |
222 | */ |
223 | case 128 ... 191: { | |
224 | const u16 idx = value - options; | |
225 | ||
7690af3f ACM |
226 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
227 | opt, len, idx, | |
228 | value) != 0) | |
7c657876 ACM |
229 | goto out_invalid_option; |
230 | } | |
231 | break; | |
232 | case 192 ... 255: { | |
233 | const u16 idx = value - options; | |
234 | ||
7690af3f ACM |
235 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
236 | opt, len, idx, | |
237 | value) != 0) | |
7c657876 ACM |
238 | goto out_invalid_option; |
239 | } | |
240 | break; | |
241 | default: | |
59348b19 GR |
242 | DCCP_CRIT("DCCP(%p): option %d(len=%d) not " |
243 | "implemented, ignoring", sk, opt, len); | |
7c657876 ACM |
244 | break; |
245 | } | |
afe00251 AB |
246 | |
247 | if (opt != DCCPO_MANDATORY) | |
248 | mandatory = 0; | |
7c657876 ACM |
249 | } |
250 | ||
6df9424a ACM |
251 | /* mandatory was the last byte in option list -> reset connection */ |
252 | if (mandatory) | |
253 | goto out_invalid_option; | |
254 | ||
7c657876 ACM |
255 | return 0; |
256 | ||
257 | out_invalid_option: | |
258 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); | |
259 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; | |
59348b19 | 260 | DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); |
7c657876 ACM |
261 | return -1; |
262 | } | |
263 | ||
b61fafc4 ACM |
264 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
265 | ||
7c657876 ACM |
266 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
267 | const unsigned int len) | |
268 | { | |
269 | if (len > 3) | |
270 | *to++ = (value & 0xFF000000) >> 24; | |
271 | if (len > 2) | |
272 | *to++ = (value & 0xFF0000) >> 16; | |
273 | if (len > 1) | |
274 | *to++ = (value & 0xFF00) >> 8; | |
275 | if (len > 0) | |
276 | *to++ = (value & 0xFF); | |
277 | } | |
278 | ||
279 | static inline int dccp_ndp_len(const int ndp) | |
280 | { | |
281 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; | |
282 | } | |
283 | ||
2d0817d1 | 284 | int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
285 | const unsigned char option, |
286 | const void *value, const unsigned char len) | |
287 | { | |
288 | unsigned char *to; | |
289 | ||
2d0817d1 ACM |
290 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
291 | return -1; | |
7c657876 ACM |
292 | |
293 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; | |
294 | ||
295 | to = skb_push(skb, len + 2); | |
296 | *to++ = option; | |
297 | *to++ = len + 2; | |
298 | ||
299 | memcpy(to, value, len); | |
2d0817d1 | 300 | return 0; |
7c657876 ACM |
301 | } |
302 | ||
303 | EXPORT_SYMBOL_GPL(dccp_insert_option); | |
304 | ||
2d0817d1 | 305 | static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
306 | { |
307 | struct dccp_sock *dp = dccp_sk(sk); | |
308 | int ndp = dp->dccps_ndp_count; | |
309 | ||
310 | if (dccp_non_data_packet(skb)) | |
311 | ++dp->dccps_ndp_count; | |
312 | else | |
313 | dp->dccps_ndp_count = 0; | |
314 | ||
315 | if (ndp > 0) { | |
316 | unsigned char *ptr; | |
317 | const int ndp_len = dccp_ndp_len(ndp); | |
318 | const int len = ndp_len + 2; | |
319 | ||
320 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) | |
2d0817d1 | 321 | return -1; |
7c657876 ACM |
322 | |
323 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
324 | ||
325 | ptr = skb_push(skb, len); | |
326 | *ptr++ = DCCPO_NDP_COUNT; | |
327 | *ptr++ = len; | |
328 | dccp_encode_value_var(ndp, ptr, ndp_len); | |
329 | } | |
2d0817d1 ACM |
330 | |
331 | return 0; | |
7c657876 ACM |
332 | } |
333 | ||
334 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) | |
335 | { | |
b1c9fe7b | 336 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
7c657876 ACM |
337 | } |
338 | ||
2d0817d1 ACM |
339 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
340 | u32 elapsed_time) | |
7c657876 | 341 | { |
7c657876 ACM |
342 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
343 | const int len = 2 + elapsed_time_len; | |
344 | unsigned char *to; | |
345 | ||
1bc09869 | 346 | if (elapsed_time_len == 0) |
2d0817d1 | 347 | return 0; |
7c657876 | 348 | |
2d0817d1 ACM |
349 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
350 | return -1; | |
7c657876 ACM |
351 | |
352 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
353 | ||
354 | to = skb_push(skb, len); | |
355 | *to++ = DCCPO_ELAPSED_TIME; | |
356 | *to++ = len; | |
357 | ||
1bc09869 | 358 | if (elapsed_time_len == 2) { |
60fe62e7 | 359 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
360 | memcpy(to, &var16, 2); |
361 | } else { | |
60fe62e7 | 362 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
363 | memcpy(to, &var32, 4); |
364 | } | |
7c657876 | 365 | |
2d0817d1 | 366 | return 0; |
7c657876 ACM |
367 | } |
368 | ||
d4b81ff7 | 369 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
7c657876 | 370 | |
b0e56780 ACM |
371 | void dccp_timestamp(const struct sock *sk, struct timeval *tv) |
372 | { | |
373 | const struct dccp_sock *dp = dccp_sk(sk); | |
374 | ||
375 | do_gettimeofday(tv); | |
376 | tv->tv_sec -= dp->dccps_epoch.tv_sec; | |
377 | tv->tv_usec -= dp->dccps_epoch.tv_usec; | |
378 | ||
379 | while (tv->tv_usec < 0) { | |
380 | tv->tv_sec--; | |
381 | tv->tv_usec += USEC_PER_SEC; | |
382 | } | |
383 | } | |
384 | ||
385 | EXPORT_SYMBOL_GPL(dccp_timestamp); | |
386 | ||
2d0817d1 | 387 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
7c657876 | 388 | { |
1bc09869 | 389 | struct timeval tv; |
60fe62e7 | 390 | __be32 now; |
afe00251 | 391 | |
b0e56780 | 392 | dccp_timestamp(sk, &tv); |
60fe62e7 | 393 | now = htonl(timeval_usecs(&tv) / 10); |
1bc09869 IM |
394 | /* yes this will overflow but that is the point as we want a |
395 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ | |
396 | ||
2d0817d1 | 397 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
7c657876 ACM |
398 | } |
399 | ||
d4b81ff7 ACM |
400 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
401 | ||
2d0817d1 ACM |
402 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
403 | struct sk_buff *skb) | |
7c657876 ACM |
404 | { |
405 | struct dccp_sock *dp = dccp_sk(sk); | |
b0e56780 | 406 | struct timeval now; |
60fe62e7 | 407 | __be32 tstamp_echo; |
b0e56780 ACM |
408 | u32 elapsed_time; |
409 | int len, elapsed_time_len; | |
7c657876 ACM |
410 | unsigned char *to; |
411 | ||
b0e56780 ACM |
412 | dccp_timestamp(sk, &now); |
413 | elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; | |
414 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); | |
415 | len = 6 + elapsed_time_len; | |
416 | ||
2d0817d1 ACM |
417 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
418 | return -1; | |
7c657876 ACM |
419 | |
420 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; | |
421 | ||
422 | to = skb_push(skb, len); | |
423 | *to++ = DCCPO_TIMESTAMP_ECHO; | |
424 | *to++ = len; | |
425 | ||
426 | tstamp_echo = htonl(dp->dccps_timestamp_echo); | |
427 | memcpy(to, &tstamp_echo, 4); | |
428 | to += 4; | |
afe00251 | 429 | |
1bc09869 | 430 | if (elapsed_time_len == 2) { |
60fe62e7 | 431 | const __be16 var16 = htons((u16)elapsed_time); |
1bc09869 IM |
432 | memcpy(to, &var16, 2); |
433 | } else if (elapsed_time_len == 4) { | |
60fe62e7 | 434 | const __be32 var32 = htonl(elapsed_time); |
1bc09869 IM |
435 | memcpy(to, &var32, 4); |
436 | } | |
7c657876 | 437 | |
7c657876 | 438 | dp->dccps_timestamp_echo = 0; |
1bc09869 IM |
439 | dp->dccps_timestamp_time.tv_sec = 0; |
440 | dp->dccps_timestamp_time.tv_usec = 0; | |
2d0817d1 | 441 | return 0; |
7c657876 ACM |
442 | } |
443 | ||
afe00251 AB |
444 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
445 | u8 *val, u8 len) | |
446 | { | |
447 | u8 *to; | |
448 | ||
449 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { | |
59348b19 | 450 | DCCP_WARN("packet too small for feature %d option!\n", feat); |
afe00251 AB |
451 | return -1; |
452 | } | |
453 | ||
454 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; | |
455 | ||
456 | to = skb_push(skb, len + 3); | |
457 | *to++ = type; | |
458 | *to++ = len + 3; | |
459 | *to++ = feat; | |
460 | ||
461 | if (len) | |
462 | memcpy(to, val, len); | |
afe00251 | 463 | |
c02fdc0e GR |
464 | dccp_pr_debug("%s(%s (%d), ...), length %d\n", |
465 | dccp_feat_typename(type), | |
466 | dccp_feat_name(feat), feat, len); | |
afe00251 AB |
467 | return 0; |
468 | } | |
469 | ||
2d0817d1 | 470 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
afe00251 AB |
471 | { |
472 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 473 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
474 | struct dccp_opt_pend *opt, *next; |
475 | int change = 0; | |
476 | ||
477 | /* confirm any options [NN opts] */ | |
a4bf3902 | 478 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
479 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
480 | opt->dccpop_feat, opt->dccpop_val, | |
481 | opt->dccpop_len); | |
482 | /* fear empty confirms */ | |
483 | if (opt->dccpop_val) | |
484 | kfree(opt->dccpop_val); | |
485 | kfree(opt); | |
486 | } | |
a4bf3902 | 487 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
488 | |
489 | /* see which features we need to send */ | |
a4bf3902 | 490 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
491 | /* see if we need to send any confirm */ |
492 | if (opt->dccpop_sc) { | |
493 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, | |
494 | opt->dccpop_feat, | |
495 | opt->dccpop_sc->dccpoc_val, | |
496 | opt->dccpop_sc->dccpoc_len); | |
497 | ||
498 | BUG_ON(!opt->dccpop_sc->dccpoc_val); | |
499 | kfree(opt->dccpop_sc->dccpoc_val); | |
500 | kfree(opt->dccpop_sc); | |
501 | opt->dccpop_sc = NULL; | |
502 | } | |
503 | ||
504 | /* any option not confirmed, re-send it */ | |
505 | if (!opt->dccpop_conf) { | |
506 | dccp_insert_feat_opt(skb, opt->dccpop_type, | |
507 | opt->dccpop_feat, opt->dccpop_val, | |
508 | opt->dccpop_len); | |
509 | change++; | |
510 | } | |
511 | } | |
512 | ||
513 | /* Retransmit timer. | |
514 | * If this is the master listening sock, we don't set a timer on it. It | |
515 | * should be fine because if the dude doesn't receive our RESPONSE | |
516 | * [which will contain the CHANGE] he will send another REQUEST which | |
517 | * will "retrnasmit" the change. | |
518 | */ | |
519 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { | |
520 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); | |
521 | ||
522 | /* XXX don't reset the timer on re-transmissions. I.e. reset it | |
523 | * only when sending new stuff i guess. Currently the timer | |
524 | * never backs off because on re-transmission it just resets it! | |
525 | */ | |
526 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
527 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); | |
528 | } | |
2d0817d1 ACM |
529 | |
530 | return 0; | |
afe00251 AB |
531 | } |
532 | ||
2d0817d1 | 533 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
534 | { |
535 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 536 | struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 ACM |
537 | |
538 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; | |
539 | ||
a4bf3902 | 540 | if (dmsk->dccpms_send_ndp_count && |
2d0817d1 ACM |
541 | dccp_insert_option_ndp(sk, skb)) |
542 | return -1; | |
7c657876 ACM |
543 | |
544 | if (!dccp_packet_without_ack(skb)) { | |
a4bf3902 | 545 | if (dmsk->dccpms_send_ack_vector && |
2d0817d1 ACM |
546 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
547 | dccp_insert_option_ackvec(sk, skb)) | |
548 | return -1; | |
549 | ||
550 | if (dp->dccps_timestamp_echo != 0 && | |
551 | dccp_insert_option_timestamp_echo(sk, skb)) | |
552 | return -1; | |
7c657876 ACM |
553 | } |
554 | ||
507d37cf | 555 | if (dp->dccps_hc_rx_insert_options) { |
2d0817d1 ACM |
556 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
557 | return -1; | |
507d37cf ACM |
558 | dp->dccps_hc_rx_insert_options = 0; |
559 | } | |
560 | if (dp->dccps_hc_tx_insert_options) { | |
2d0817d1 ACM |
561 | if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb)) |
562 | return -1; | |
507d37cf ACM |
563 | dp->dccps_hc_tx_insert_options = 0; |
564 | } | |
7c657876 | 565 | |
afe00251 | 566 | /* Feature negotiation */ |
2d0817d1 ACM |
567 | /* Data packets can't do feat negotiation */ |
568 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && | |
569 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && | |
570 | dccp_insert_options_feat(sk, skb)) | |
571 | return -1; | |
afe00251 | 572 | |
7c657876 ACM |
573 | /* XXX: insert other options when appropriate */ |
574 | ||
575 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { | |
576 | /* The length of all options has to be a multiple of 4 */ | |
577 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; | |
578 | ||
579 | if (padding != 0) { | |
580 | padding = 4 - padding; | |
581 | memset(skb_push(skb, padding), 0, padding); | |
582 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; | |
583 | } | |
584 | } | |
2d0817d1 ACM |
585 | |
586 | return 0; | |
7c657876 | 587 | } |