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afe00251 AB |
1 | /* |
2 | * net/dccp/feat.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Andrea Bittau <a.bittau@cs.ucl.ac.uk> | |
6 | * | |
5cdae198 GR |
7 | * ASSUMPTIONS |
8 | * ----------- | |
f74e91b6 GR |
9 | * o Feature negotiation is coordinated with connection setup (as in TCP), wild |
10 | * changes of parameters of an established connection are not supported. | |
5cdae198 GR |
11 | * o All currently known SP features have 1-byte quantities. If in the future |
12 | * extensions of RFCs 4340..42 define features with item lengths larger than | |
13 | * one byte, a feature-specific extension of the code will be required. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
afe00251 AB |
19 | */ |
20 | ||
afe00251 AB |
21 | #include <linux/module.h> |
22 | ||
6ffd30fb | 23 | #include "ccid.h" |
afe00251 AB |
24 | #include "feat.h" |
25 | ||
26 | #define DCCP_FEAT_SP_NOAGREE (-123) | |
27 | ||
7d43d1a0 GR |
28 | static const struct { |
29 | u8 feat_num; /* DCCPF_xxx */ | |
30 | enum dccp_feat_type rxtx; /* RX or TX */ | |
31 | enum dccp_feat_type reconciliation; /* SP or NN */ | |
32 | u8 default_value; /* as in 6.4 */ | |
33 | /* | |
34 | * Lookup table for location and type of features (from RFC 4340/4342) | |
35 | * +--------------------------+----+-----+----+----+---------+-----------+ | |
36 | * | Feature | Location | Reconc. | Initial | Section | | |
37 | * | | RX | TX | SP | NN | Value | Reference | | |
38 | * +--------------------------+----+-----+----+----+---------+-----------+ | |
39 | * | DCCPF_CCID | | X | X | | 2 | 10 | | |
40 | * | DCCPF_SHORT_SEQNOS | | X | X | | 0 | 7.6.1 | | |
41 | * | DCCPF_SEQUENCE_WINDOW | | X | | X | 100 | 7.5.2 | | |
42 | * | DCCPF_ECN_INCAPABLE | X | | X | | 0 | 12.1 | | |
43 | * | DCCPF_ACK_RATIO | | X | | X | 2 | 11.3 | | |
44 | * | DCCPF_SEND_ACK_VECTOR | X | | X | | 0 | 11.5 | | |
45 | * | DCCPF_SEND_NDP_COUNT | | X | X | | 0 | 7.7.2 | | |
46 | * | DCCPF_MIN_CSUM_COVER | X | | X | | 0 | 9.2.1 | | |
47 | * | DCCPF_DATA_CHECKSUM | X | | X | | 0 | 9.3.1 | | |
48 | * | DCCPF_SEND_LEV_RATE | X | | X | | 0 | 4342/8.4 | | |
49 | * +--------------------------+----+-----+----+----+---------+-----------+ | |
50 | */ | |
51 | } dccp_feat_table[] = { | |
52 | { DCCPF_CCID, FEAT_AT_TX, FEAT_SP, 2 }, | |
53 | { DCCPF_SHORT_SEQNOS, FEAT_AT_TX, FEAT_SP, 0 }, | |
54 | { DCCPF_SEQUENCE_WINDOW, FEAT_AT_TX, FEAT_NN, 100 }, | |
55 | { DCCPF_ECN_INCAPABLE, FEAT_AT_RX, FEAT_SP, 0 }, | |
56 | { DCCPF_ACK_RATIO, FEAT_AT_TX, FEAT_NN, 2 }, | |
57 | { DCCPF_SEND_ACK_VECTOR, FEAT_AT_RX, FEAT_SP, 0 }, | |
58 | { DCCPF_SEND_NDP_COUNT, FEAT_AT_TX, FEAT_SP, 0 }, | |
59 | { DCCPF_MIN_CSUM_COVER, FEAT_AT_RX, FEAT_SP, 0 }, | |
60 | { DCCPF_DATA_CHECKSUM, FEAT_AT_RX, FEAT_SP, 0 }, | |
61 | { DCCPF_SEND_LEV_RATE, FEAT_AT_RX, FEAT_SP, 0 }, | |
62 | }; | |
63 | #define DCCP_FEAT_SUPPORTED_MAX ARRAY_SIZE(dccp_feat_table) | |
64 | ||
61e6473e GR |
65 | /** |
66 | * dccp_feat_index - Hash function to map feature number into array position | |
67 | * Returns consecutive array index or -1 if the feature is not understood. | |
68 | */ | |
69 | static int dccp_feat_index(u8 feat_num) | |
70 | { | |
71 | /* The first 9 entries are occupied by the types from RFC 4340, 6.4 */ | |
72 | if (feat_num > DCCPF_RESERVED && feat_num <= DCCPF_DATA_CHECKSUM) | |
73 | return feat_num - 1; | |
74 | ||
75 | /* | |
76 | * Other features: add cases for new feature types here after adding | |
77 | * them to the above table. | |
78 | */ | |
79 | switch (feat_num) { | |
80 | case DCCPF_SEND_LEV_RATE: | |
81 | return DCCP_FEAT_SUPPORTED_MAX - 1; | |
82 | } | |
83 | return -1; | |
84 | } | |
85 | ||
86 | static u8 dccp_feat_type(u8 feat_num) | |
87 | { | |
88 | int idx = dccp_feat_index(feat_num); | |
89 | ||
90 | if (idx < 0) | |
91 | return FEAT_UNKNOWN; | |
92 | return dccp_feat_table[idx].reconciliation; | |
93 | } | |
94 | ||
e8ef967a GR |
95 | static int dccp_feat_default_value(u8 feat_num) |
96 | { | |
97 | int idx = dccp_feat_index(feat_num); | |
98 | /* | |
99 | * There are no default values for unknown features, so encountering a | |
100 | * negative index here indicates a serious problem somewhere else. | |
101 | */ | |
102 | DCCP_BUG_ON(idx < 0); | |
103 | ||
104 | return idx < 0 ? 0 : dccp_feat_table[idx].default_value; | |
105 | } | |
106 | ||
ac75773c GR |
107 | /* copy constructor, fval must not already contain allocated memory */ |
108 | static int dccp_feat_clone_sp_val(dccp_feat_val *fval, u8 const *val, u8 len) | |
109 | { | |
110 | fval->sp.len = len; | |
111 | if (fval->sp.len > 0) { | |
112 | fval->sp.vec = kmemdup(val, len, gfp_any()); | |
113 | if (fval->sp.vec == NULL) { | |
114 | fval->sp.len = 0; | |
115 | return -ENOBUFS; | |
116 | } | |
117 | } | |
118 | return 0; | |
119 | } | |
120 | ||
61e6473e GR |
121 | static void dccp_feat_val_destructor(u8 feat_num, dccp_feat_val *val) |
122 | { | |
123 | if (unlikely(val == NULL)) | |
124 | return; | |
125 | if (dccp_feat_type(feat_num) == FEAT_SP) | |
126 | kfree(val->sp.vec); | |
127 | memset(val, 0, sizeof(*val)); | |
128 | } | |
129 | ||
ac75773c GR |
130 | static struct dccp_feat_entry * |
131 | dccp_feat_clone_entry(struct dccp_feat_entry const *original) | |
132 | { | |
133 | struct dccp_feat_entry *new; | |
134 | u8 type = dccp_feat_type(original->feat_num); | |
135 | ||
136 | if (type == FEAT_UNKNOWN) | |
137 | return NULL; | |
138 | ||
139 | new = kmemdup(original, sizeof(struct dccp_feat_entry), gfp_any()); | |
140 | if (new == NULL) | |
141 | return NULL; | |
142 | ||
143 | if (type == FEAT_SP && dccp_feat_clone_sp_val(&new->val, | |
144 | original->val.sp.vec, | |
145 | original->val.sp.len)) { | |
146 | kfree(new); | |
147 | return NULL; | |
148 | } | |
149 | return new; | |
150 | } | |
151 | ||
61e6473e GR |
152 | static void dccp_feat_entry_destructor(struct dccp_feat_entry *entry) |
153 | { | |
154 | if (entry != NULL) { | |
155 | dccp_feat_val_destructor(entry->feat_num, &entry->val); | |
156 | kfree(entry); | |
157 | } | |
158 | } | |
159 | ||
160 | /* | |
161 | * List management functions | |
162 | * | |
163 | * Feature negotiation lists rely on and maintain the following invariants: | |
164 | * - each feat_num in the list is known, i.e. we know its type and default value | |
165 | * - each feat_num/is_local combination is unique (old entries are overwritten) | |
166 | * - SP values are always freshly allocated | |
167 | * - list is sorted in increasing order of feature number (faster lookup) | |
168 | */ | |
0c116839 GR |
169 | static struct dccp_feat_entry *dccp_feat_list_lookup(struct list_head *fn_list, |
170 | u8 feat_num, bool is_local) | |
171 | { | |
172 | struct dccp_feat_entry *entry; | |
173 | ||
174 | list_for_each_entry(entry, fn_list, node) | |
175 | if (entry->feat_num == feat_num && entry->is_local == is_local) | |
176 | return entry; | |
177 | else if (entry->feat_num > feat_num) | |
178 | break; | |
179 | return NULL; | |
180 | } | |
61e6473e | 181 | |
e8ef967a GR |
182 | /** |
183 | * dccp_feat_entry_new - Central list update routine (called by all others) | |
184 | * @head: list to add to | |
185 | * @feat: feature number | |
186 | * @local: whether the local (1) or remote feature with number @feat is meant | |
187 | * This is the only constructor and serves to ensure the above invariants. | |
188 | */ | |
189 | static struct dccp_feat_entry * | |
190 | dccp_feat_entry_new(struct list_head *head, u8 feat, bool local) | |
191 | { | |
192 | struct dccp_feat_entry *entry; | |
193 | ||
194 | list_for_each_entry(entry, head, node) | |
195 | if (entry->feat_num == feat && entry->is_local == local) { | |
196 | dccp_feat_val_destructor(entry->feat_num, &entry->val); | |
197 | return entry; | |
198 | } else if (entry->feat_num > feat) { | |
199 | head = &entry->node; | |
200 | break; | |
201 | } | |
202 | ||
203 | entry = kmalloc(sizeof(*entry), gfp_any()); | |
204 | if (entry != NULL) { | |
205 | entry->feat_num = feat; | |
206 | entry->is_local = local; | |
207 | list_add_tail(&entry->node, head); | |
208 | } | |
209 | return entry; | |
210 | } | |
211 | ||
212 | /** | |
213 | * dccp_feat_push_change - Add/overwrite a Change option in the list | |
214 | * @fn_list: feature-negotiation list to update | |
215 | * @feat: one of %dccp_feature_numbers | |
216 | * @local: whether local (1) or remote (0) @feat_num is meant | |
217 | * @needs_mandatory: whether to use Mandatory feature negotiation options | |
218 | * @fval: pointer to NN/SP value to be inserted (will be copied) | |
219 | */ | |
220 | static int dccp_feat_push_change(struct list_head *fn_list, u8 feat, u8 local, | |
221 | u8 mandatory, dccp_feat_val *fval) | |
222 | { | |
223 | struct dccp_feat_entry *new = dccp_feat_entry_new(fn_list, feat, local); | |
224 | ||
225 | if (new == NULL) | |
226 | return -ENOMEM; | |
227 | ||
228 | new->feat_num = feat; | |
229 | new->is_local = local; | |
230 | new->state = FEAT_INITIALISING; | |
231 | new->needs_confirm = 0; | |
232 | new->empty_confirm = 0; | |
233 | new->val = *fval; | |
234 | new->needs_mandatory = mandatory; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
61e6473e GR |
239 | static inline void dccp_feat_list_pop(struct dccp_feat_entry *entry) |
240 | { | |
241 | list_del(&entry->node); | |
242 | dccp_feat_entry_destructor(entry); | |
243 | } | |
244 | ||
245 | void dccp_feat_list_purge(struct list_head *fn_list) | |
246 | { | |
247 | struct dccp_feat_entry *entry, *next; | |
248 | ||
249 | list_for_each_entry_safe(entry, next, fn_list, node) | |
250 | dccp_feat_entry_destructor(entry); | |
251 | INIT_LIST_HEAD(fn_list); | |
252 | } | |
253 | EXPORT_SYMBOL_GPL(dccp_feat_list_purge); | |
254 | ||
ac75773c GR |
255 | /* generate @to as full clone of @from - @to must not contain any nodes */ |
256 | int dccp_feat_clone_list(struct list_head const *from, struct list_head *to) | |
257 | { | |
258 | struct dccp_feat_entry *entry, *new; | |
259 | ||
260 | INIT_LIST_HEAD(to); | |
261 | list_for_each_entry(entry, from, node) { | |
262 | new = dccp_feat_clone_entry(entry); | |
263 | if (new == NULL) | |
264 | goto cloning_failed; | |
265 | list_add_tail(&new->node, to); | |
266 | } | |
267 | return 0; | |
268 | ||
269 | cloning_failed: | |
270 | dccp_feat_list_purge(to); | |
271 | return -ENOMEM; | |
272 | } | |
273 | ||
e8ef967a GR |
274 | static u8 dccp_feat_is_valid_nn_val(u8 feat_num, u64 val) |
275 | { | |
276 | switch (feat_num) { | |
277 | case DCCPF_ACK_RATIO: | |
278 | return val <= DCCPF_ACK_RATIO_MAX; | |
279 | case DCCPF_SEQUENCE_WINDOW: | |
280 | return val >= DCCPF_SEQ_WMIN && val <= DCCPF_SEQ_WMAX; | |
281 | } | |
282 | return 0; /* feature unknown - so we can't tell */ | |
283 | } | |
284 | ||
285 | /* check that SP values are within the ranges defined in RFC 4340 */ | |
286 | static u8 dccp_feat_is_valid_sp_val(u8 feat_num, u8 val) | |
287 | { | |
288 | switch (feat_num) { | |
289 | case DCCPF_CCID: | |
290 | return val == DCCPC_CCID2 || val == DCCPC_CCID3; | |
291 | /* Type-check Boolean feature values: */ | |
292 | case DCCPF_SHORT_SEQNOS: | |
293 | case DCCPF_ECN_INCAPABLE: | |
294 | case DCCPF_SEND_ACK_VECTOR: | |
295 | case DCCPF_SEND_NDP_COUNT: | |
296 | case DCCPF_DATA_CHECKSUM: | |
297 | case DCCPF_SEND_LEV_RATE: | |
298 | return val < 2; | |
299 | case DCCPF_MIN_CSUM_COVER: | |
300 | return val < 16; | |
301 | } | |
302 | return 0; /* feature unknown */ | |
303 | } | |
304 | ||
305 | static u8 dccp_feat_sp_list_ok(u8 feat_num, u8 const *sp_list, u8 sp_len) | |
306 | { | |
307 | if (sp_list == NULL || sp_len < 1) | |
308 | return 0; | |
309 | while (sp_len--) | |
310 | if (!dccp_feat_is_valid_sp_val(feat_num, *sp_list++)) | |
311 | return 0; | |
312 | return 1; | |
313 | } | |
314 | ||
315 | /** | |
316 | * __feat_register_nn - Register new NN value on socket | |
317 | * @fn: feature-negotiation list to register with | |
318 | * @feat: an NN feature from %dccp_feature_numbers | |
319 | * @mandatory: use Mandatory option if 1 | |
320 | * @nn_val: value to register (restricted to 4 bytes) | |
321 | * Note that NN features are local by definition (RFC 4340, 6.3.2). | |
322 | */ | |
323 | static int __feat_register_nn(struct list_head *fn, u8 feat, | |
324 | u8 mandatory, u64 nn_val) | |
325 | { | |
326 | dccp_feat_val fval = { .nn = nn_val }; | |
327 | ||
328 | if (dccp_feat_type(feat) != FEAT_NN || | |
329 | !dccp_feat_is_valid_nn_val(feat, nn_val)) | |
330 | return -EINVAL; | |
331 | ||
332 | /* Don't bother with default values, they will be activated anyway. */ | |
333 | if (nn_val - (u64)dccp_feat_default_value(feat) == 0) | |
334 | return 0; | |
335 | ||
336 | return dccp_feat_push_change(fn, feat, 1, mandatory, &fval); | |
337 | } | |
338 | ||
339 | /** | |
340 | * __feat_register_sp - Register new SP value/list on socket | |
341 | * @fn: feature-negotiation list to register with | |
342 | * @feat: an SP feature from %dccp_feature_numbers | |
343 | * @is_local: whether the local (1) or the remote (0) @feat is meant | |
344 | * @mandatory: use Mandatory option if 1 | |
345 | * @sp_val: SP value followed by optional preference list | |
346 | * @sp_len: length of @sp_val in bytes | |
347 | */ | |
348 | static int __feat_register_sp(struct list_head *fn, u8 feat, u8 is_local, | |
349 | u8 mandatory, u8 const *sp_val, u8 sp_len) | |
350 | { | |
351 | dccp_feat_val fval; | |
352 | ||
353 | if (dccp_feat_type(feat) != FEAT_SP || | |
354 | !dccp_feat_sp_list_ok(feat, sp_val, sp_len)) | |
355 | return -EINVAL; | |
356 | ||
d90ebcbf GR |
357 | /* Avoid negotiating alien CCIDs by only advertising supported ones */ |
358 | if (feat == DCCPF_CCID && !ccid_support_check(sp_val, sp_len)) | |
359 | return -EOPNOTSUPP; | |
360 | ||
e8ef967a GR |
361 | if (dccp_feat_clone_sp_val(&fval, sp_val, sp_len)) |
362 | return -ENOMEM; | |
363 | ||
364 | return dccp_feat_push_change(fn, feat, is_local, mandatory, &fval); | |
365 | } | |
366 | ||
8ca0d17b ACM |
367 | int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature, |
368 | u8 *val, u8 len, gfp_t gfp) | |
afe00251 | 369 | { |
afe00251 AB |
370 | struct dccp_opt_pend *opt; |
371 | ||
c02fdc0e | 372 | dccp_feat_debug(type, feature, *val); |
afe00251 | 373 | |
dd6303df | 374 | if (len > 3) { |
59348b19 | 375 | DCCP_WARN("invalid length %d\n", len); |
19443178 | 376 | return -EINVAL; |
c02fdc0e GR |
377 | } |
378 | /* XXX add further sanity checks */ | |
6ffd30fb | 379 | |
afe00251 | 380 | /* check if that feature is already being negotiated */ |
a4bf3902 | 381 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
382 | /* ok we found a negotiation for this option already */ |
383 | if (opt->dccpop_feat == feature && opt->dccpop_type == type) { | |
384 | dccp_pr_debug("Replacing old\n"); | |
385 | /* replace */ | |
386 | BUG_ON(opt->dccpop_val == NULL); | |
387 | kfree(opt->dccpop_val); | |
388 | opt->dccpop_val = val; | |
389 | opt->dccpop_len = len; | |
390 | opt->dccpop_conf = 0; | |
391 | return 0; | |
392 | } | |
393 | } | |
394 | ||
395 | /* negotiation for a new feature */ | |
396 | opt = kmalloc(sizeof(*opt), gfp); | |
397 | if (opt == NULL) | |
398 | return -ENOMEM; | |
399 | ||
400 | opt->dccpop_type = type; | |
401 | opt->dccpop_feat = feature; | |
402 | opt->dccpop_len = len; | |
403 | opt->dccpop_val = val; | |
404 | opt->dccpop_conf = 0; | |
405 | opt->dccpop_sc = NULL; | |
406 | ||
407 | BUG_ON(opt->dccpop_val == NULL); | |
408 | ||
a4bf3902 | 409 | list_add_tail(&opt->dccpop_node, &dmsk->dccpms_pending); |
afe00251 AB |
410 | return 0; |
411 | } | |
412 | ||
413 | EXPORT_SYMBOL_GPL(dccp_feat_change); | |
414 | ||
9eca0a47 GR |
415 | /* |
416 | * Tracking features whose value depend on the choice of CCID | |
417 | * | |
418 | * This is designed with an extension in mind so that a list walk could be done | |
419 | * before activating any features. However, the existing framework was found to | |
420 | * work satisfactorily up until now, the automatic verification is left open. | |
421 | * When adding new CCIDs, add a corresponding dependency table here. | |
422 | */ | |
423 | static const struct ccid_dependency *dccp_feat_ccid_deps(u8 ccid, bool is_local) | |
424 | { | |
425 | static const struct ccid_dependency ccid2_dependencies[2][2] = { | |
426 | /* | |
427 | * CCID2 mandates Ack Vectors (RFC 4341, 4.): as CCID is a TX | |
428 | * feature and Send Ack Vector is an RX feature, `is_local' | |
429 | * needs to be reversed. | |
430 | */ | |
431 | { /* Dependencies of the receiver-side (remote) CCID2 */ | |
432 | { | |
433 | .dependent_feat = DCCPF_SEND_ACK_VECTOR, | |
434 | .is_local = true, | |
435 | .is_mandatory = true, | |
436 | .val = 1 | |
437 | }, | |
438 | { 0, 0, 0, 0 } | |
439 | }, | |
440 | { /* Dependencies of the sender-side (local) CCID2 */ | |
441 | { | |
442 | .dependent_feat = DCCPF_SEND_ACK_VECTOR, | |
443 | .is_local = false, | |
444 | .is_mandatory = true, | |
445 | .val = 1 | |
446 | }, | |
447 | { 0, 0, 0, 0 } | |
448 | } | |
449 | }; | |
450 | static const struct ccid_dependency ccid3_dependencies[2][5] = { | |
451 | { /* | |
452 | * Dependencies of the receiver-side CCID3 | |
453 | */ | |
454 | { /* locally disable Ack Vectors */ | |
455 | .dependent_feat = DCCPF_SEND_ACK_VECTOR, | |
456 | .is_local = true, | |
457 | .is_mandatory = false, | |
458 | .val = 0 | |
459 | }, | |
460 | { /* see below why Send Loss Event Rate is on */ | |
461 | .dependent_feat = DCCPF_SEND_LEV_RATE, | |
462 | .is_local = true, | |
463 | .is_mandatory = true, | |
464 | .val = 1 | |
465 | }, | |
466 | { /* NDP Count is needed as per RFC 4342, 6.1.1 */ | |
467 | .dependent_feat = DCCPF_SEND_NDP_COUNT, | |
468 | .is_local = false, | |
469 | .is_mandatory = true, | |
470 | .val = 1 | |
471 | }, | |
472 | { 0, 0, 0, 0 }, | |
473 | }, | |
474 | { /* | |
475 | * CCID3 at the TX side: we request that the HC-receiver | |
476 | * will not send Ack Vectors (they will be ignored, so | |
477 | * Mandatory is not set); we enable Send Loss Event Rate | |
478 | * (Mandatory since the implementation does not support | |
479 | * the Loss Intervals option of RFC 4342, 8.6). | |
480 | * The last two options are for peer's information only. | |
481 | */ | |
482 | { | |
483 | .dependent_feat = DCCPF_SEND_ACK_VECTOR, | |
484 | .is_local = false, | |
485 | .is_mandatory = false, | |
486 | .val = 0 | |
487 | }, | |
488 | { | |
489 | .dependent_feat = DCCPF_SEND_LEV_RATE, | |
490 | .is_local = false, | |
491 | .is_mandatory = true, | |
492 | .val = 1 | |
493 | }, | |
494 | { /* this CCID does not support Ack Ratio */ | |
495 | .dependent_feat = DCCPF_ACK_RATIO, | |
496 | .is_local = true, | |
497 | .is_mandatory = false, | |
498 | .val = 0 | |
499 | }, | |
500 | { /* tell receiver we are sending NDP counts */ | |
501 | .dependent_feat = DCCPF_SEND_NDP_COUNT, | |
502 | .is_local = true, | |
503 | .is_mandatory = false, | |
504 | .val = 1 | |
505 | }, | |
506 | { 0, 0, 0, 0 } | |
507 | } | |
508 | }; | |
509 | switch (ccid) { | |
510 | case DCCPC_CCID2: | |
511 | return ccid2_dependencies[is_local]; | |
512 | case DCCPC_CCID3: | |
513 | return ccid3_dependencies[is_local]; | |
514 | default: | |
515 | return NULL; | |
516 | } | |
517 | } | |
518 | ||
519 | /** | |
520 | * dccp_feat_propagate_ccid - Resolve dependencies of features on choice of CCID | |
521 | * @fn: feature-negotiation list to update | |
522 | * @id: CCID number to track | |
523 | * @is_local: whether TX CCID (1) or RX CCID (0) is meant | |
524 | * This function needs to be called after registering all other features. | |
525 | */ | |
526 | static int dccp_feat_propagate_ccid(struct list_head *fn, u8 id, bool is_local) | |
527 | { | |
528 | const struct ccid_dependency *table = dccp_feat_ccid_deps(id, is_local); | |
529 | int i, rc = (table == NULL); | |
530 | ||
531 | for (i = 0; rc == 0 && table[i].dependent_feat != DCCPF_RESERVED; i++) | |
532 | if (dccp_feat_type(table[i].dependent_feat) == FEAT_SP) | |
533 | rc = __feat_register_sp(fn, table[i].dependent_feat, | |
534 | table[i].is_local, | |
535 | table[i].is_mandatory, | |
536 | &table[i].val, 1); | |
537 | else | |
538 | rc = __feat_register_nn(fn, table[i].dependent_feat, | |
539 | table[i].is_mandatory, | |
540 | table[i].val); | |
541 | return rc; | |
542 | } | |
543 | ||
544 | /** | |
545 | * dccp_feat_finalise_settings - Finalise settings before starting negotiation | |
546 | * @dp: client or listening socket (settings will be inherited) | |
547 | * This is called after all registrations (socket initialisation, sysctls, and | |
548 | * sockopt calls), and before sending the first packet containing Change options | |
549 | * (ie. client-Request or server-Response), to ensure internal consistency. | |
550 | */ | |
551 | int dccp_feat_finalise_settings(struct dccp_sock *dp) | |
552 | { | |
553 | struct list_head *fn = &dp->dccps_featneg; | |
554 | struct dccp_feat_entry *entry; | |
555 | int i = 2, ccids[2] = { -1, -1 }; | |
556 | ||
557 | /* | |
558 | * Propagating CCIDs: | |
559 | * 1) not useful to propagate CCID settings if this host advertises more | |
560 | * than one CCID: the choice of CCID may still change - if this is | |
561 | * the client, or if this is the server and the client sends | |
562 | * singleton CCID values. | |
563 | * 2) since is that propagate_ccid changes the list, we defer changing | |
564 | * the sorted list until after the traversal. | |
565 | */ | |
566 | list_for_each_entry(entry, fn, node) | |
567 | if (entry->feat_num == DCCPF_CCID && entry->val.sp.len == 1) | |
568 | ccids[entry->is_local] = entry->val.sp.vec[0]; | |
569 | while (i--) | |
570 | if (ccids[i] > 0 && dccp_feat_propagate_ccid(fn, ccids[i], i)) | |
571 | return -1; | |
572 | return 0; | |
573 | } | |
574 | ||
0c116839 GR |
575 | /** |
576 | * dccp_feat_server_ccid_dependencies - Resolve CCID-dependent features | |
577 | * It is the server which resolves the dependencies once the CCID has been | |
578 | * fully negotiated. If no CCID has been negotiated, it uses the default CCID. | |
579 | */ | |
580 | int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq) | |
581 | { | |
582 | struct list_head *fn = &dreq->dreq_featneg; | |
583 | struct dccp_feat_entry *entry; | |
584 | u8 is_local, ccid; | |
585 | ||
586 | for (is_local = 0; is_local <= 1; is_local++) { | |
587 | entry = dccp_feat_list_lookup(fn, DCCPF_CCID, is_local); | |
588 | ||
589 | if (entry != NULL && !entry->empty_confirm) | |
590 | ccid = entry->val.sp.vec[0]; | |
591 | else | |
592 | ccid = dccp_feat_default_value(DCCPF_CCID); | |
593 | ||
594 | if (dccp_feat_propagate_ccid(fn, ccid, is_local)) | |
595 | return -1; | |
596 | } | |
597 | return 0; | |
598 | } | |
599 | ||
6ffd30fb AB |
600 | static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr) |
601 | { | |
602 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 603 | struct dccp_minisock *dmsk = dccp_msk(sk); |
6ffd30fb AB |
604 | /* figure out if we are changing our CCID or the peer's */ |
605 | const int rx = type == DCCPO_CHANGE_R; | |
a4bf3902 | 606 | const u8 ccid_nr = rx ? dmsk->dccpms_rx_ccid : dmsk->dccpms_tx_ccid; |
6ffd30fb AB |
607 | struct ccid *new_ccid; |
608 | ||
609 | /* Check if nothing is being changed. */ | |
610 | if (ccid_nr == new_ccid_nr) | |
611 | return 0; | |
612 | ||
613 | new_ccid = ccid_new(new_ccid_nr, sk, rx, GFP_ATOMIC); | |
614 | if (new_ccid == NULL) | |
615 | return -ENOMEM; | |
616 | ||
617 | if (rx) { | |
618 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
619 | dp->dccps_hc_rx_ccid = new_ccid; | |
a4bf3902 | 620 | dmsk->dccpms_rx_ccid = new_ccid_nr; |
6ffd30fb AB |
621 | } else { |
622 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
623 | dp->dccps_hc_tx_ccid = new_ccid; | |
a4bf3902 | 624 | dmsk->dccpms_tx_ccid = new_ccid_nr; |
6ffd30fb AB |
625 | } |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
afe00251 AB |
630 | static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val) |
631 | { | |
c02fdc0e | 632 | dccp_feat_debug(type, feat, val); |
6ffd30fb AB |
633 | |
634 | switch (feat) { | |
635 | case DCCPF_CCID: | |
636 | return dccp_feat_update_ccid(sk, type, val); | |
637 | default: | |
c02fdc0e GR |
638 | dccp_pr_debug("UNIMPLEMENTED: %s(%d, ...)\n", |
639 | dccp_feat_typename(type), feat); | |
6ffd30fb AB |
640 | break; |
641 | } | |
afe00251 AB |
642 | return 0; |
643 | } | |
644 | ||
645 | static int dccp_feat_reconcile(struct sock *sk, struct dccp_opt_pend *opt, | |
646 | u8 *rpref, u8 rlen) | |
647 | { | |
648 | struct dccp_sock *dp = dccp_sk(sk); | |
649 | u8 *spref, slen, *res = NULL; | |
650 | int i, j, rc, agree = 1; | |
651 | ||
652 | BUG_ON(rpref == NULL); | |
653 | ||
654 | /* check if we are the black sheep */ | |
655 | if (dp->dccps_role == DCCP_ROLE_CLIENT) { | |
656 | spref = rpref; | |
657 | slen = rlen; | |
658 | rpref = opt->dccpop_val; | |
659 | rlen = opt->dccpop_len; | |
660 | } else { | |
661 | spref = opt->dccpop_val; | |
662 | slen = opt->dccpop_len; | |
663 | } | |
664 | /* | |
665 | * Now we have server preference list in spref and client preference in | |
666 | * rpref | |
667 | */ | |
668 | BUG_ON(spref == NULL); | |
669 | BUG_ON(rpref == NULL); | |
670 | ||
671 | /* FIXME sanity check vals */ | |
672 | ||
673 | /* Are values in any order? XXX Lame "algorithm" here */ | |
afe00251 AB |
674 | for (i = 0; i < slen; i++) { |
675 | for (j = 0; j < rlen; j++) { | |
676 | if (spref[i] == rpref[j]) { | |
677 | res = &spref[i]; | |
678 | break; | |
679 | } | |
680 | } | |
681 | if (res) | |
682 | break; | |
683 | } | |
684 | ||
685 | /* we didn't agree on anything */ | |
686 | if (res == NULL) { | |
687 | /* confirm previous value */ | |
688 | switch (opt->dccpop_feat) { | |
689 | case DCCPF_CCID: | |
690 | /* XXX did i get this right? =P */ | |
691 | if (opt->dccpop_type == DCCPO_CHANGE_L) | |
a4bf3902 | 692 | res = &dccp_msk(sk)->dccpms_tx_ccid; |
afe00251 | 693 | else |
a4bf3902 | 694 | res = &dccp_msk(sk)->dccpms_rx_ccid; |
afe00251 AB |
695 | break; |
696 | ||
697 | default: | |
59348b19 GR |
698 | DCCP_BUG("Fell through, feat=%d", opt->dccpop_feat); |
699 | /* XXX implement res */ | |
afe00251 AB |
700 | return -EFAULT; |
701 | } | |
702 | ||
703 | dccp_pr_debug("Don't agree... reconfirming %d\n", *res); | |
704 | agree = 0; /* this is used for mandatory options... */ | |
705 | } | |
706 | ||
707 | /* need to put result and our preference list */ | |
afe00251 AB |
708 | rlen = 1 + opt->dccpop_len; |
709 | rpref = kmalloc(rlen, GFP_ATOMIC); | |
710 | if (rpref == NULL) | |
711 | return -ENOMEM; | |
712 | ||
713 | *rpref = *res; | |
714 | memcpy(&rpref[1], opt->dccpop_val, opt->dccpop_len); | |
715 | ||
716 | /* put it in the "confirm queue" */ | |
717 | if (opt->dccpop_sc == NULL) { | |
718 | opt->dccpop_sc = kmalloc(sizeof(*opt->dccpop_sc), GFP_ATOMIC); | |
719 | if (opt->dccpop_sc == NULL) { | |
720 | kfree(rpref); | |
721 | return -ENOMEM; | |
722 | } | |
723 | } else { | |
724 | /* recycle the confirm slot */ | |
725 | BUG_ON(opt->dccpop_sc->dccpoc_val == NULL); | |
726 | kfree(opt->dccpop_sc->dccpoc_val); | |
727 | dccp_pr_debug("recycling confirm slot\n"); | |
728 | } | |
729 | memset(opt->dccpop_sc, 0, sizeof(*opt->dccpop_sc)); | |
730 | ||
731 | opt->dccpop_sc->dccpoc_val = rpref; | |
732 | opt->dccpop_sc->dccpoc_len = rlen; | |
733 | ||
734 | /* update the option on our side [we are about to send the confirm] */ | |
735 | rc = dccp_feat_update(sk, opt->dccpop_type, opt->dccpop_feat, *res); | |
736 | if (rc) { | |
737 | kfree(opt->dccpop_sc->dccpoc_val); | |
738 | kfree(opt->dccpop_sc); | |
68907dad | 739 | opt->dccpop_sc = NULL; |
afe00251 AB |
740 | return rc; |
741 | } | |
742 | ||
743 | dccp_pr_debug("Will confirm %d\n", *rpref); | |
744 | ||
745 | /* say we want to change to X but we just got a confirm X, suppress our | |
746 | * change | |
747 | */ | |
748 | if (!opt->dccpop_conf) { | |
749 | if (*opt->dccpop_val == *res) | |
750 | opt->dccpop_conf = 1; | |
751 | dccp_pr_debug("won't ask for change of same feature\n"); | |
752 | } | |
753 | ||
754 | return agree ? 0 : DCCP_FEAT_SP_NOAGREE; /* used for mandatory opts */ | |
755 | } | |
756 | ||
757 | static int dccp_feat_sp(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len) | |
758 | { | |
a4bf3902 | 759 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
760 | struct dccp_opt_pend *opt; |
761 | int rc = 1; | |
762 | u8 t; | |
763 | ||
764 | /* | |
765 | * We received a CHANGE. We gotta match it against our own preference | |
766 | * list. If we got a CHANGE_R it means it's a change for us, so we need | |
767 | * to compare our CHANGE_L list. | |
768 | */ | |
769 | if (type == DCCPO_CHANGE_L) | |
770 | t = DCCPO_CHANGE_R; | |
771 | else | |
772 | t = DCCPO_CHANGE_L; | |
773 | ||
774 | /* find our preference list for this feature */ | |
a4bf3902 | 775 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
776 | if (opt->dccpop_type != t || opt->dccpop_feat != feature) |
777 | continue; | |
778 | ||
779 | /* find the winner from the two preference lists */ | |
780 | rc = dccp_feat_reconcile(sk, opt, val, len); | |
781 | break; | |
782 | } | |
783 | ||
784 | /* We didn't deal with the change. This can happen if we have no | |
785 | * preference list for the feature. In fact, it just shouldn't | |
786 | * happen---if we understand a feature, we should have a preference list | |
787 | * with at least the default value. | |
788 | */ | |
789 | BUG_ON(rc == 1); | |
790 | ||
791 | return rc; | |
792 | } | |
793 | ||
794 | static int dccp_feat_nn(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len) | |
795 | { | |
796 | struct dccp_opt_pend *opt; | |
a4bf3902 | 797 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
798 | u8 *copy; |
799 | int rc; | |
800 | ||
c02fdc0e GR |
801 | /* NN features must be Change L (sec. 6.3.2) */ |
802 | if (type != DCCPO_CHANGE_L) { | |
803 | dccp_pr_debug("received %s for NN feature %d\n", | |
804 | dccp_feat_typename(type), feature); | |
afe00251 AB |
805 | return -EFAULT; |
806 | } | |
807 | ||
808 | /* XXX sanity check opt val */ | |
809 | ||
810 | /* copy option so we can confirm it */ | |
811 | opt = kzalloc(sizeof(*opt), GFP_ATOMIC); | |
812 | if (opt == NULL) | |
813 | return -ENOMEM; | |
814 | ||
eed73417 | 815 | copy = kmemdup(val, len, GFP_ATOMIC); |
afe00251 AB |
816 | if (copy == NULL) { |
817 | kfree(opt); | |
818 | return -ENOMEM; | |
819 | } | |
afe00251 AB |
820 | |
821 | opt->dccpop_type = DCCPO_CONFIRM_R; /* NN can only confirm R */ | |
822 | opt->dccpop_feat = feature; | |
823 | opt->dccpop_val = copy; | |
824 | opt->dccpop_len = len; | |
825 | ||
826 | /* change feature */ | |
827 | rc = dccp_feat_update(sk, type, feature, *val); | |
828 | if (rc) { | |
829 | kfree(opt->dccpop_val); | |
830 | kfree(opt); | |
831 | return rc; | |
832 | } | |
833 | ||
c02fdc0e GR |
834 | dccp_feat_debug(type, feature, *copy); |
835 | ||
a4bf3902 | 836 | list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf); |
afe00251 AB |
837 | |
838 | return 0; | |
839 | } | |
840 | ||
8ca0d17b ACM |
841 | static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk, |
842 | u8 type, u8 feature) | |
afe00251 | 843 | { |
afe00251 AB |
844 | /* XXX check if other confirms for that are queued and recycle slot */ |
845 | struct dccp_opt_pend *opt = kzalloc(sizeof(*opt), GFP_ATOMIC); | |
846 | ||
847 | if (opt == NULL) { | |
848 | /* XXX what do we do? Ignoring should be fine. It's a change | |
849 | * after all =P | |
850 | */ | |
851 | return; | |
852 | } | |
853 | ||
c02fdc0e | 854 | switch (type) { |
e576de82 JJ |
855 | case DCCPO_CHANGE_L: |
856 | opt->dccpop_type = DCCPO_CONFIRM_R; | |
857 | break; | |
858 | case DCCPO_CHANGE_R: | |
859 | opt->dccpop_type = DCCPO_CONFIRM_L; | |
860 | break; | |
861 | default: | |
862 | DCCP_WARN("invalid type %d\n", type); | |
863 | kfree(opt); | |
864 | return; | |
c02fdc0e | 865 | } |
afe00251 | 866 | opt->dccpop_feat = feature; |
68907dad | 867 | opt->dccpop_val = NULL; |
afe00251 AB |
868 | opt->dccpop_len = 0; |
869 | ||
870 | /* change feature */ | |
c02fdc0e GR |
871 | dccp_pr_debug("Empty %s(%d)\n", dccp_feat_typename(type), feature); |
872 | ||
a4bf3902 | 873 | list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf); |
afe00251 AB |
874 | } |
875 | ||
876 | static void dccp_feat_flush_confirm(struct sock *sk) | |
877 | { | |
a4bf3902 | 878 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 | 879 | /* Check if there is anything to confirm in the first place */ |
a4bf3902 | 880 | int yes = !list_empty(&dmsk->dccpms_conf); |
afe00251 AB |
881 | |
882 | if (!yes) { | |
883 | struct dccp_opt_pend *opt; | |
884 | ||
a4bf3902 | 885 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
886 | if (opt->dccpop_conf) { |
887 | yes = 1; | |
888 | break; | |
889 | } | |
890 | } | |
891 | } | |
892 | ||
893 | if (!yes) | |
894 | return; | |
895 | ||
896 | /* OK there is something to confirm... */ | |
897 | /* XXX check if packet is in flight? Send delayed ack?? */ | |
898 | if (sk->sk_state == DCCP_OPEN) | |
899 | dccp_send_ack(sk); | |
900 | } | |
901 | ||
902 | int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len) | |
903 | { | |
904 | int rc; | |
905 | ||
f74e91b6 GR |
906 | /* Ignore Change requests other than during connection setup */ |
907 | if (sk->sk_state != DCCP_LISTEN && sk->sk_state != DCCP_REQUESTING) | |
908 | return 0; | |
c02fdc0e | 909 | dccp_feat_debug(type, feature, *val); |
afe00251 AB |
910 | |
911 | /* figure out if it's SP or NN feature */ | |
912 | switch (feature) { | |
913 | /* deal with SP features */ | |
914 | case DCCPF_CCID: | |
915 | rc = dccp_feat_sp(sk, type, feature, val, len); | |
916 | break; | |
917 | ||
918 | /* deal with NN features */ | |
919 | case DCCPF_ACK_RATIO: | |
920 | rc = dccp_feat_nn(sk, type, feature, val, len); | |
921 | break; | |
922 | ||
923 | /* XXX implement other features */ | |
924 | default: | |
c02fdc0e GR |
925 | dccp_pr_debug("UNIMPLEMENTED: not handling %s(%d, ...)\n", |
926 | dccp_feat_typename(type), feature); | |
afe00251 AB |
927 | rc = -EFAULT; |
928 | break; | |
929 | } | |
930 | ||
931 | /* check if there were problems changing features */ | |
932 | if (rc) { | |
933 | /* If we don't agree on SP, we sent a confirm for old value. | |
934 | * However we propagate rc to caller in case option was | |
935 | * mandatory | |
936 | */ | |
937 | if (rc != DCCP_FEAT_SP_NOAGREE) | |
8ca0d17b | 938 | dccp_feat_empty_confirm(dccp_msk(sk), type, feature); |
afe00251 AB |
939 | } |
940 | ||
941 | /* generate the confirm [if required] */ | |
942 | dccp_feat_flush_confirm(sk); | |
943 | ||
944 | return rc; | |
945 | } | |
946 | ||
947 | EXPORT_SYMBOL_GPL(dccp_feat_change_recv); | |
948 | ||
949 | int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature, | |
950 | u8 *val, u8 len) | |
951 | { | |
952 | u8 t; | |
953 | struct dccp_opt_pend *opt; | |
a4bf3902 | 954 | struct dccp_minisock *dmsk = dccp_msk(sk); |
c02fdc0e | 955 | int found = 0; |
afe00251 AB |
956 | int all_confirmed = 1; |
957 | ||
f74e91b6 GR |
958 | /* Ignore Confirm options other than during connection setup */ |
959 | if (sk->sk_state != DCCP_LISTEN && sk->sk_state != DCCP_REQUESTING) | |
960 | return 0; | |
c02fdc0e | 961 | dccp_feat_debug(type, feature, *val); |
afe00251 AB |
962 | |
963 | /* locate our change request */ | |
c02fdc0e GR |
964 | switch (type) { |
965 | case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break; | |
966 | case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break; | |
8109b02b | 967 | default: DCCP_WARN("invalid type %d\n", type); |
c02fdc0e GR |
968 | return 1; |
969 | ||
970 | } | |
971 | /* XXX sanity check feature value */ | |
afe00251 | 972 | |
a4bf3902 | 973 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
974 | if (!opt->dccpop_conf && opt->dccpop_type == t && |
975 | opt->dccpop_feat == feature) { | |
c02fdc0e GR |
976 | found = 1; |
977 | dccp_pr_debug("feature %d found\n", opt->dccpop_feat); | |
978 | ||
afe00251 AB |
979 | /* XXX do sanity check */ |
980 | ||
981 | opt->dccpop_conf = 1; | |
982 | ||
983 | /* We got a confirmation---change the option */ | |
984 | dccp_feat_update(sk, opt->dccpop_type, | |
985 | opt->dccpop_feat, *val); | |
986 | ||
c02fdc0e | 987 | /* XXX check the return value of dccp_feat_update */ |
afe00251 AB |
988 | break; |
989 | } | |
990 | ||
991 | if (!opt->dccpop_conf) | |
992 | all_confirmed = 0; | |
993 | } | |
994 | ||
c02fdc0e GR |
995 | if (!found) |
996 | dccp_pr_debug("%s(%d, ...) never requested\n", | |
997 | dccp_feat_typename(type), feature); | |
afe00251 AB |
998 | return 0; |
999 | } | |
1000 | ||
1001 | EXPORT_SYMBOL_GPL(dccp_feat_confirm_recv); | |
1002 | ||
8ca0d17b | 1003 | void dccp_feat_clean(struct dccp_minisock *dmsk) |
afe00251 | 1004 | { |
afe00251 AB |
1005 | struct dccp_opt_pend *opt, *next; |
1006 | ||
a4bf3902 | 1007 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_pending, |
afe00251 | 1008 | dccpop_node) { |
c9eaf173 YH |
1009 | BUG_ON(opt->dccpop_val == NULL); |
1010 | kfree(opt->dccpop_val); | |
afe00251 AB |
1011 | |
1012 | if (opt->dccpop_sc != NULL) { | |
1013 | BUG_ON(opt->dccpop_sc->dccpoc_val == NULL); | |
1014 | kfree(opt->dccpop_sc->dccpoc_val); | |
1015 | kfree(opt->dccpop_sc); | |
1016 | } | |
1017 | ||
c9eaf173 YH |
1018 | kfree(opt); |
1019 | } | |
a4bf3902 | 1020 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
afe00251 | 1021 | |
a4bf3902 | 1022 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
1023 | BUG_ON(opt == NULL); |
1024 | if (opt->dccpop_val != NULL) | |
1025 | kfree(opt->dccpop_val); | |
1026 | kfree(opt); | |
1027 | } | |
a4bf3902 | 1028 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
1029 | } |
1030 | ||
1031 | EXPORT_SYMBOL_GPL(dccp_feat_clean); | |
1032 | ||
1033 | /* this is to be called only when a listening sock creates its child. It is | |
1034 | * assumed by the function---the confirm is not duplicated, but rather it is | |
1035 | * "passed on". | |
1036 | */ | |
1037 | int dccp_feat_clone(struct sock *oldsk, struct sock *newsk) | |
1038 | { | |
a4bf3902 ACM |
1039 | struct dccp_minisock *olddmsk = dccp_msk(oldsk); |
1040 | struct dccp_minisock *newdmsk = dccp_msk(newsk); | |
afe00251 AB |
1041 | struct dccp_opt_pend *opt; |
1042 | int rc = 0; | |
1043 | ||
a4bf3902 ACM |
1044 | INIT_LIST_HEAD(&newdmsk->dccpms_pending); |
1045 | INIT_LIST_HEAD(&newdmsk->dccpms_conf); | |
afe00251 | 1046 | |
a4bf3902 | 1047 | list_for_each_entry(opt, &olddmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
1048 | struct dccp_opt_pend *newopt; |
1049 | /* copy the value of the option */ | |
eed73417 | 1050 | u8 *val = kmemdup(opt->dccpop_val, opt->dccpop_len, GFP_ATOMIC); |
afe00251 AB |
1051 | |
1052 | if (val == NULL) | |
1053 | goto out_clean; | |
afe00251 | 1054 | |
eed73417 | 1055 | newopt = kmemdup(opt, sizeof(*newopt), GFP_ATOMIC); |
afe00251 AB |
1056 | if (newopt == NULL) { |
1057 | kfree(val); | |
1058 | goto out_clean; | |
1059 | } | |
1060 | ||
1061 | /* insert the option */ | |
afe00251 | 1062 | newopt->dccpop_val = val; |
a4bf3902 | 1063 | list_add_tail(&newopt->dccpop_node, &newdmsk->dccpms_pending); |
afe00251 AB |
1064 | |
1065 | /* XXX what happens with backlogs and multiple connections at | |
1066 | * once... | |
1067 | */ | |
1068 | /* the master socket no longer needs to worry about confirms */ | |
68907dad | 1069 | opt->dccpop_sc = NULL; /* it's not a memleak---new socket has it */ |
afe00251 AB |
1070 | |
1071 | /* reset state for a new socket */ | |
1072 | opt->dccpop_conf = 0; | |
1073 | } | |
1074 | ||
1075 | /* XXX not doing anything about the conf queue */ | |
1076 | ||
1077 | out: | |
1078 | return rc; | |
1079 | ||
1080 | out_clean: | |
8ca0d17b | 1081 | dccp_feat_clean(newdmsk); |
afe00251 AB |
1082 | rc = -ENOMEM; |
1083 | goto out; | |
1084 | } | |
1085 | ||
1086 | EXPORT_SYMBOL_GPL(dccp_feat_clone); | |
1087 | ||
e8ef967a | 1088 | int dccp_feat_init(struct sock *sk) |
afe00251 | 1089 | { |
e8ef967a GR |
1090 | struct dccp_sock *dp = dccp_sk(sk); |
1091 | struct dccp_minisock *dmsk = dccp_msk(sk); | |
afe00251 AB |
1092 | int rc; |
1093 | ||
e8ef967a GR |
1094 | INIT_LIST_HEAD(&dmsk->dccpms_pending); /* XXX no longer used */ |
1095 | INIT_LIST_HEAD(&dmsk->dccpms_conf); /* XXX no longer used */ | |
afe00251 AB |
1096 | |
1097 | /* CCID L */ | |
e8ef967a GR |
1098 | rc = __feat_register_sp(&dp->dccps_featneg, DCCPF_CCID, 1, 0, |
1099 | &dmsk->dccpms_tx_ccid, 1); | |
afe00251 AB |
1100 | if (rc) |
1101 | goto out; | |
1102 | ||
1103 | /* CCID R */ | |
e8ef967a GR |
1104 | rc = __feat_register_sp(&dp->dccps_featneg, DCCPF_CCID, 0, 0, |
1105 | &dmsk->dccpms_rx_ccid, 1); | |
afe00251 AB |
1106 | if (rc) |
1107 | goto out; | |
1108 | ||
1109 | /* Ack ratio */ | |
e8ef967a GR |
1110 | rc = __feat_register_nn(&dp->dccps_featneg, DCCPF_ACK_RATIO, 0, |
1111 | dmsk->dccpms_ack_ratio); | |
afe00251 AB |
1112 | out: |
1113 | return rc; | |
1114 | } | |
1115 | ||
1116 | EXPORT_SYMBOL_GPL(dccp_feat_init); | |
c02fdc0e GR |
1117 | |
1118 | #ifdef CONFIG_IP_DCCP_DEBUG | |
1119 | const char *dccp_feat_typename(const u8 type) | |
1120 | { | |
1121 | switch(type) { | |
1122 | case DCCPO_CHANGE_L: return("ChangeL"); | |
1123 | case DCCPO_CONFIRM_L: return("ConfirmL"); | |
1124 | case DCCPO_CHANGE_R: return("ChangeR"); | |
1125 | case DCCPO_CONFIRM_R: return("ConfirmR"); | |
1126 | /* the following case must not appear in feature negotation */ | |
8109b02b | 1127 | default: dccp_pr_debug("unknown type %d [BUG!]\n", type); |
c02fdc0e GR |
1128 | } |
1129 | return NULL; | |
1130 | } | |
1131 | ||
1132 | EXPORT_SYMBOL_GPL(dccp_feat_typename); | |
1133 | ||
1134 | const char *dccp_feat_name(const u8 feat) | |
1135 | { | |
1136 | static const char *feature_names[] = { | |
1137 | [DCCPF_RESERVED] = "Reserved", | |
1138 | [DCCPF_CCID] = "CCID", | |
1139 | [DCCPF_SHORT_SEQNOS] = "Allow Short Seqnos", | |
1140 | [DCCPF_SEQUENCE_WINDOW] = "Sequence Window", | |
1141 | [DCCPF_ECN_INCAPABLE] = "ECN Incapable", | |
1142 | [DCCPF_ACK_RATIO] = "Ack Ratio", | |
1143 | [DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector", | |
1144 | [DCCPF_SEND_NDP_COUNT] = "Send NDP Count", | |
1145 | [DCCPF_MIN_CSUM_COVER] = "Min. Csum Coverage", | |
1146 | [DCCPF_DATA_CHECKSUM] = "Send Data Checksum", | |
1147 | }; | |
dd6303df GR |
1148 | if (feat > DCCPF_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC) |
1149 | return feature_names[DCCPF_RESERVED]; | |
1150 | ||
7d43d1a0 GR |
1151 | if (feat == DCCPF_SEND_LEV_RATE) |
1152 | return "Send Loss Event Rate"; | |
c02fdc0e GR |
1153 | if (feat >= DCCPF_MIN_CCID_SPECIFIC) |
1154 | return "CCID-specific"; | |
1155 | ||
c02fdc0e GR |
1156 | return feature_names[feat]; |
1157 | } | |
1158 | ||
1159 | EXPORT_SYMBOL_GPL(dccp_feat_name); | |
1160 | #endif /* CONFIG_IP_DCCP_DEBUG */ |