Commit | Line | Data |
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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 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
afe00251 AB |
13 | #include <linux/module.h> |
14 | ||
6ffd30fb | 15 | #include "ccid.h" |
afe00251 AB |
16 | #include "feat.h" |
17 | ||
18 | #define DCCP_FEAT_SP_NOAGREE (-123) | |
19 | ||
8ca0d17b ACM |
20 | int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature, |
21 | u8 *val, u8 len, gfp_t gfp) | |
afe00251 | 22 | { |
afe00251 AB |
23 | struct dccp_opt_pend *opt; |
24 | ||
c02fdc0e | 25 | dccp_feat_debug(type, feature, *val); |
afe00251 | 26 | |
c02fdc0e | 27 | if (!dccp_feat_is_valid_type(type)) { |
59348b19 | 28 | DCCP_WARN("option type %d invalid in negotiation\n", type); |
c02fdc0e GR |
29 | return 1; |
30 | } | |
31 | if (!dccp_feat_is_valid_length(type, feature, len)) { | |
59348b19 | 32 | DCCP_WARN("invalid length %d\n", len); |
c02fdc0e GR |
33 | return 1; |
34 | } | |
35 | /* XXX add further sanity checks */ | |
6ffd30fb | 36 | |
afe00251 | 37 | /* check if that feature is already being negotiated */ |
a4bf3902 | 38 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
39 | /* ok we found a negotiation for this option already */ |
40 | if (opt->dccpop_feat == feature && opt->dccpop_type == type) { | |
41 | dccp_pr_debug("Replacing old\n"); | |
42 | /* replace */ | |
43 | BUG_ON(opt->dccpop_val == NULL); | |
44 | kfree(opt->dccpop_val); | |
45 | opt->dccpop_val = val; | |
46 | opt->dccpop_len = len; | |
47 | opt->dccpop_conf = 0; | |
48 | return 0; | |
49 | } | |
50 | } | |
51 | ||
52 | /* negotiation for a new feature */ | |
53 | opt = kmalloc(sizeof(*opt), gfp); | |
54 | if (opt == NULL) | |
55 | return -ENOMEM; | |
56 | ||
57 | opt->dccpop_type = type; | |
58 | opt->dccpop_feat = feature; | |
59 | opt->dccpop_len = len; | |
60 | opt->dccpop_val = val; | |
61 | opt->dccpop_conf = 0; | |
62 | opt->dccpop_sc = NULL; | |
63 | ||
64 | BUG_ON(opt->dccpop_val == NULL); | |
65 | ||
a4bf3902 | 66 | list_add_tail(&opt->dccpop_node, &dmsk->dccpms_pending); |
afe00251 AB |
67 | return 0; |
68 | } | |
69 | ||
70 | EXPORT_SYMBOL_GPL(dccp_feat_change); | |
71 | ||
6ffd30fb AB |
72 | static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr) |
73 | { | |
74 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 75 | struct dccp_minisock *dmsk = dccp_msk(sk); |
6ffd30fb AB |
76 | /* figure out if we are changing our CCID or the peer's */ |
77 | const int rx = type == DCCPO_CHANGE_R; | |
a4bf3902 | 78 | const u8 ccid_nr = rx ? dmsk->dccpms_rx_ccid : dmsk->dccpms_tx_ccid; |
6ffd30fb AB |
79 | struct ccid *new_ccid; |
80 | ||
81 | /* Check if nothing is being changed. */ | |
82 | if (ccid_nr == new_ccid_nr) | |
83 | return 0; | |
84 | ||
85 | new_ccid = ccid_new(new_ccid_nr, sk, rx, GFP_ATOMIC); | |
86 | if (new_ccid == NULL) | |
87 | return -ENOMEM; | |
88 | ||
89 | if (rx) { | |
90 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); | |
91 | dp->dccps_hc_rx_ccid = new_ccid; | |
a4bf3902 | 92 | dmsk->dccpms_rx_ccid = new_ccid_nr; |
6ffd30fb AB |
93 | } else { |
94 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); | |
95 | dp->dccps_hc_tx_ccid = new_ccid; | |
a4bf3902 | 96 | dmsk->dccpms_tx_ccid = new_ccid_nr; |
6ffd30fb AB |
97 | } |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
afe00251 AB |
102 | /* XXX taking only u8 vals */ |
103 | static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val) | |
104 | { | |
c02fdc0e | 105 | dccp_feat_debug(type, feat, val); |
6ffd30fb AB |
106 | |
107 | switch (feat) { | |
108 | case DCCPF_CCID: | |
109 | return dccp_feat_update_ccid(sk, type, val); | |
110 | default: | |
c02fdc0e GR |
111 | dccp_pr_debug("UNIMPLEMENTED: %s(%d, ...)\n", |
112 | dccp_feat_typename(type), feat); | |
6ffd30fb AB |
113 | break; |
114 | } | |
afe00251 AB |
115 | return 0; |
116 | } | |
117 | ||
118 | static int dccp_feat_reconcile(struct sock *sk, struct dccp_opt_pend *opt, | |
119 | u8 *rpref, u8 rlen) | |
120 | { | |
121 | struct dccp_sock *dp = dccp_sk(sk); | |
122 | u8 *spref, slen, *res = NULL; | |
123 | int i, j, rc, agree = 1; | |
124 | ||
125 | BUG_ON(rpref == NULL); | |
126 | ||
127 | /* check if we are the black sheep */ | |
128 | if (dp->dccps_role == DCCP_ROLE_CLIENT) { | |
129 | spref = rpref; | |
130 | slen = rlen; | |
131 | rpref = opt->dccpop_val; | |
132 | rlen = opt->dccpop_len; | |
133 | } else { | |
134 | spref = opt->dccpop_val; | |
135 | slen = opt->dccpop_len; | |
136 | } | |
137 | /* | |
138 | * Now we have server preference list in spref and client preference in | |
139 | * rpref | |
140 | */ | |
141 | BUG_ON(spref == NULL); | |
142 | BUG_ON(rpref == NULL); | |
143 | ||
144 | /* FIXME sanity check vals */ | |
145 | ||
146 | /* Are values in any order? XXX Lame "algorithm" here */ | |
147 | /* XXX assume values are 1 byte */ | |
148 | for (i = 0; i < slen; i++) { | |
149 | for (j = 0; j < rlen; j++) { | |
150 | if (spref[i] == rpref[j]) { | |
151 | res = &spref[i]; | |
152 | break; | |
153 | } | |
154 | } | |
155 | if (res) | |
156 | break; | |
157 | } | |
158 | ||
159 | /* we didn't agree on anything */ | |
160 | if (res == NULL) { | |
161 | /* confirm previous value */ | |
162 | switch (opt->dccpop_feat) { | |
163 | case DCCPF_CCID: | |
164 | /* XXX did i get this right? =P */ | |
165 | if (opt->dccpop_type == DCCPO_CHANGE_L) | |
a4bf3902 | 166 | res = &dccp_msk(sk)->dccpms_tx_ccid; |
afe00251 | 167 | else |
a4bf3902 | 168 | res = &dccp_msk(sk)->dccpms_rx_ccid; |
afe00251 AB |
169 | break; |
170 | ||
171 | default: | |
59348b19 GR |
172 | DCCP_BUG("Fell through, feat=%d", opt->dccpop_feat); |
173 | /* XXX implement res */ | |
afe00251 AB |
174 | return -EFAULT; |
175 | } | |
176 | ||
177 | dccp_pr_debug("Don't agree... reconfirming %d\n", *res); | |
178 | agree = 0; /* this is used for mandatory options... */ | |
179 | } | |
180 | ||
181 | /* need to put result and our preference list */ | |
182 | /* XXX assume 1 byte vals */ | |
183 | rlen = 1 + opt->dccpop_len; | |
184 | rpref = kmalloc(rlen, GFP_ATOMIC); | |
185 | if (rpref == NULL) | |
186 | return -ENOMEM; | |
187 | ||
188 | *rpref = *res; | |
189 | memcpy(&rpref[1], opt->dccpop_val, opt->dccpop_len); | |
190 | ||
191 | /* put it in the "confirm queue" */ | |
192 | if (opt->dccpop_sc == NULL) { | |
193 | opt->dccpop_sc = kmalloc(sizeof(*opt->dccpop_sc), GFP_ATOMIC); | |
194 | if (opt->dccpop_sc == NULL) { | |
195 | kfree(rpref); | |
196 | return -ENOMEM; | |
197 | } | |
198 | } else { | |
199 | /* recycle the confirm slot */ | |
200 | BUG_ON(opt->dccpop_sc->dccpoc_val == NULL); | |
201 | kfree(opt->dccpop_sc->dccpoc_val); | |
202 | dccp_pr_debug("recycling confirm slot\n"); | |
203 | } | |
204 | memset(opt->dccpop_sc, 0, sizeof(*opt->dccpop_sc)); | |
205 | ||
206 | opt->dccpop_sc->dccpoc_val = rpref; | |
207 | opt->dccpop_sc->dccpoc_len = rlen; | |
208 | ||
209 | /* update the option on our side [we are about to send the confirm] */ | |
210 | rc = dccp_feat_update(sk, opt->dccpop_type, opt->dccpop_feat, *res); | |
211 | if (rc) { | |
212 | kfree(opt->dccpop_sc->dccpoc_val); | |
213 | kfree(opt->dccpop_sc); | |
68907dad | 214 | opt->dccpop_sc = NULL; |
afe00251 AB |
215 | return rc; |
216 | } | |
217 | ||
218 | dccp_pr_debug("Will confirm %d\n", *rpref); | |
219 | ||
220 | /* say we want to change to X but we just got a confirm X, suppress our | |
221 | * change | |
222 | */ | |
223 | if (!opt->dccpop_conf) { | |
224 | if (*opt->dccpop_val == *res) | |
225 | opt->dccpop_conf = 1; | |
226 | dccp_pr_debug("won't ask for change of same feature\n"); | |
227 | } | |
228 | ||
229 | return agree ? 0 : DCCP_FEAT_SP_NOAGREE; /* used for mandatory opts */ | |
230 | } | |
231 | ||
232 | static int dccp_feat_sp(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len) | |
233 | { | |
a4bf3902 | 234 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
235 | struct dccp_opt_pend *opt; |
236 | int rc = 1; | |
237 | u8 t; | |
238 | ||
239 | /* | |
240 | * We received a CHANGE. We gotta match it against our own preference | |
241 | * list. If we got a CHANGE_R it means it's a change for us, so we need | |
242 | * to compare our CHANGE_L list. | |
243 | */ | |
244 | if (type == DCCPO_CHANGE_L) | |
245 | t = DCCPO_CHANGE_R; | |
246 | else | |
247 | t = DCCPO_CHANGE_L; | |
248 | ||
249 | /* find our preference list for this feature */ | |
a4bf3902 | 250 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
251 | if (opt->dccpop_type != t || opt->dccpop_feat != feature) |
252 | continue; | |
253 | ||
254 | /* find the winner from the two preference lists */ | |
255 | rc = dccp_feat_reconcile(sk, opt, val, len); | |
256 | break; | |
257 | } | |
258 | ||
259 | /* We didn't deal with the change. This can happen if we have no | |
260 | * preference list for the feature. In fact, it just shouldn't | |
261 | * happen---if we understand a feature, we should have a preference list | |
262 | * with at least the default value. | |
263 | */ | |
264 | BUG_ON(rc == 1); | |
265 | ||
266 | return rc; | |
267 | } | |
268 | ||
269 | static int dccp_feat_nn(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len) | |
270 | { | |
271 | struct dccp_opt_pend *opt; | |
a4bf3902 | 272 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 AB |
273 | u8 *copy; |
274 | int rc; | |
275 | ||
c02fdc0e GR |
276 | /* NN features must be Change L (sec. 6.3.2) */ |
277 | if (type != DCCPO_CHANGE_L) { | |
278 | dccp_pr_debug("received %s for NN feature %d\n", | |
279 | dccp_feat_typename(type), feature); | |
afe00251 AB |
280 | return -EFAULT; |
281 | } | |
282 | ||
283 | /* XXX sanity check opt val */ | |
284 | ||
285 | /* copy option so we can confirm it */ | |
286 | opt = kzalloc(sizeof(*opt), GFP_ATOMIC); | |
287 | if (opt == NULL) | |
288 | return -ENOMEM; | |
289 | ||
eed73417 | 290 | copy = kmemdup(val, len, GFP_ATOMIC); |
afe00251 AB |
291 | if (copy == NULL) { |
292 | kfree(opt); | |
293 | return -ENOMEM; | |
294 | } | |
afe00251 AB |
295 | |
296 | opt->dccpop_type = DCCPO_CONFIRM_R; /* NN can only confirm R */ | |
297 | opt->dccpop_feat = feature; | |
298 | opt->dccpop_val = copy; | |
299 | opt->dccpop_len = len; | |
300 | ||
301 | /* change feature */ | |
302 | rc = dccp_feat_update(sk, type, feature, *val); | |
303 | if (rc) { | |
304 | kfree(opt->dccpop_val); | |
305 | kfree(opt); | |
306 | return rc; | |
307 | } | |
308 | ||
c02fdc0e GR |
309 | dccp_feat_debug(type, feature, *copy); |
310 | ||
a4bf3902 | 311 | list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf); |
afe00251 AB |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
8ca0d17b ACM |
316 | static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk, |
317 | u8 type, u8 feature) | |
afe00251 | 318 | { |
afe00251 AB |
319 | /* XXX check if other confirms for that are queued and recycle slot */ |
320 | struct dccp_opt_pend *opt = kzalloc(sizeof(*opt), GFP_ATOMIC); | |
321 | ||
322 | if (opt == NULL) { | |
323 | /* XXX what do we do? Ignoring should be fine. It's a change | |
324 | * after all =P | |
325 | */ | |
326 | return; | |
327 | } | |
328 | ||
c02fdc0e GR |
329 | switch (type) { |
330 | case DCCPO_CHANGE_L: opt->dccpop_type = DCCPO_CONFIRM_R; break; | |
331 | case DCCPO_CHANGE_R: opt->dccpop_type = DCCPO_CONFIRM_L; break; | |
8109b02b | 332 | default: DCCP_WARN("invalid type %d\n", type); return; |
c02fdc0e GR |
333 | |
334 | } | |
afe00251 | 335 | opt->dccpop_feat = feature; |
68907dad | 336 | opt->dccpop_val = NULL; |
afe00251 AB |
337 | opt->dccpop_len = 0; |
338 | ||
339 | /* change feature */ | |
c02fdc0e GR |
340 | dccp_pr_debug("Empty %s(%d)\n", dccp_feat_typename(type), feature); |
341 | ||
a4bf3902 | 342 | list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf); |
afe00251 AB |
343 | } |
344 | ||
345 | static void dccp_feat_flush_confirm(struct sock *sk) | |
346 | { | |
a4bf3902 | 347 | struct dccp_minisock *dmsk = dccp_msk(sk); |
afe00251 | 348 | /* Check if there is anything to confirm in the first place */ |
a4bf3902 | 349 | int yes = !list_empty(&dmsk->dccpms_conf); |
afe00251 AB |
350 | |
351 | if (!yes) { | |
352 | struct dccp_opt_pend *opt; | |
353 | ||
a4bf3902 | 354 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
355 | if (opt->dccpop_conf) { |
356 | yes = 1; | |
357 | break; | |
358 | } | |
359 | } | |
360 | } | |
361 | ||
362 | if (!yes) | |
363 | return; | |
364 | ||
365 | /* OK there is something to confirm... */ | |
366 | /* XXX check if packet is in flight? Send delayed ack?? */ | |
367 | if (sk->sk_state == DCCP_OPEN) | |
368 | dccp_send_ack(sk); | |
369 | } | |
370 | ||
371 | int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len) | |
372 | { | |
373 | int rc; | |
374 | ||
c02fdc0e | 375 | dccp_feat_debug(type, feature, *val); |
afe00251 AB |
376 | |
377 | /* figure out if it's SP or NN feature */ | |
378 | switch (feature) { | |
379 | /* deal with SP features */ | |
380 | case DCCPF_CCID: | |
381 | rc = dccp_feat_sp(sk, type, feature, val, len); | |
382 | break; | |
383 | ||
384 | /* deal with NN features */ | |
385 | case DCCPF_ACK_RATIO: | |
386 | rc = dccp_feat_nn(sk, type, feature, val, len); | |
387 | break; | |
388 | ||
389 | /* XXX implement other features */ | |
390 | default: | |
c02fdc0e GR |
391 | dccp_pr_debug("UNIMPLEMENTED: not handling %s(%d, ...)\n", |
392 | dccp_feat_typename(type), feature); | |
afe00251 AB |
393 | rc = -EFAULT; |
394 | break; | |
395 | } | |
396 | ||
397 | /* check if there were problems changing features */ | |
398 | if (rc) { | |
399 | /* If we don't agree on SP, we sent a confirm for old value. | |
400 | * However we propagate rc to caller in case option was | |
401 | * mandatory | |
402 | */ | |
403 | if (rc != DCCP_FEAT_SP_NOAGREE) | |
8ca0d17b | 404 | dccp_feat_empty_confirm(dccp_msk(sk), type, feature); |
afe00251 AB |
405 | } |
406 | ||
407 | /* generate the confirm [if required] */ | |
408 | dccp_feat_flush_confirm(sk); | |
409 | ||
410 | return rc; | |
411 | } | |
412 | ||
413 | EXPORT_SYMBOL_GPL(dccp_feat_change_recv); | |
414 | ||
415 | int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature, | |
416 | u8 *val, u8 len) | |
417 | { | |
418 | u8 t; | |
419 | struct dccp_opt_pend *opt; | |
a4bf3902 | 420 | struct dccp_minisock *dmsk = dccp_msk(sk); |
c02fdc0e | 421 | int found = 0; |
afe00251 AB |
422 | int all_confirmed = 1; |
423 | ||
c02fdc0e | 424 | dccp_feat_debug(type, feature, *val); |
afe00251 AB |
425 | |
426 | /* locate our change request */ | |
c02fdc0e GR |
427 | switch (type) { |
428 | case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break; | |
429 | case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break; | |
8109b02b | 430 | default: DCCP_WARN("invalid type %d\n", type); |
c02fdc0e GR |
431 | return 1; |
432 | ||
433 | } | |
434 | /* XXX sanity check feature value */ | |
afe00251 | 435 | |
a4bf3902 | 436 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
437 | if (!opt->dccpop_conf && opt->dccpop_type == t && |
438 | opt->dccpop_feat == feature) { | |
c02fdc0e GR |
439 | found = 1; |
440 | dccp_pr_debug("feature %d found\n", opt->dccpop_feat); | |
441 | ||
afe00251 AB |
442 | /* XXX do sanity check */ |
443 | ||
444 | opt->dccpop_conf = 1; | |
445 | ||
446 | /* We got a confirmation---change the option */ | |
447 | dccp_feat_update(sk, opt->dccpop_type, | |
448 | opt->dccpop_feat, *val); | |
449 | ||
c02fdc0e | 450 | /* XXX check the return value of dccp_feat_update */ |
afe00251 AB |
451 | break; |
452 | } | |
453 | ||
454 | if (!opt->dccpop_conf) | |
455 | all_confirmed = 0; | |
456 | } | |
457 | ||
458 | /* fix re-transmit timer */ | |
459 | /* XXX gotta make sure that no option negotiation occurs during | |
460 | * connection shutdown. Consider that the CLOSEREQ is sent and timer is | |
461 | * on. if all options are confirmed it might kill timer which should | |
462 | * remain alive until close is received. | |
463 | */ | |
464 | if (all_confirmed) { | |
465 | dccp_pr_debug("clear feat negotiation timer %p\n", sk); | |
466 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS); | |
467 | } | |
468 | ||
c02fdc0e GR |
469 | if (!found) |
470 | dccp_pr_debug("%s(%d, ...) never requested\n", | |
471 | dccp_feat_typename(type), feature); | |
afe00251 AB |
472 | return 0; |
473 | } | |
474 | ||
475 | EXPORT_SYMBOL_GPL(dccp_feat_confirm_recv); | |
476 | ||
8ca0d17b | 477 | void dccp_feat_clean(struct dccp_minisock *dmsk) |
afe00251 | 478 | { |
afe00251 AB |
479 | struct dccp_opt_pend *opt, *next; |
480 | ||
a4bf3902 | 481 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_pending, |
afe00251 | 482 | dccpop_node) { |
c9eaf173 YH |
483 | BUG_ON(opt->dccpop_val == NULL); |
484 | kfree(opt->dccpop_val); | |
afe00251 AB |
485 | |
486 | if (opt->dccpop_sc != NULL) { | |
487 | BUG_ON(opt->dccpop_sc->dccpoc_val == NULL); | |
488 | kfree(opt->dccpop_sc->dccpoc_val); | |
489 | kfree(opt->dccpop_sc); | |
490 | } | |
491 | ||
c9eaf173 YH |
492 | kfree(opt); |
493 | } | |
a4bf3902 | 494 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
afe00251 | 495 | |
a4bf3902 | 496 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
afe00251 AB |
497 | BUG_ON(opt == NULL); |
498 | if (opt->dccpop_val != NULL) | |
499 | kfree(opt->dccpop_val); | |
500 | kfree(opt); | |
501 | } | |
a4bf3902 | 502 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
afe00251 AB |
503 | } |
504 | ||
505 | EXPORT_SYMBOL_GPL(dccp_feat_clean); | |
506 | ||
507 | /* this is to be called only when a listening sock creates its child. It is | |
508 | * assumed by the function---the confirm is not duplicated, but rather it is | |
509 | * "passed on". | |
510 | */ | |
511 | int dccp_feat_clone(struct sock *oldsk, struct sock *newsk) | |
512 | { | |
a4bf3902 ACM |
513 | struct dccp_minisock *olddmsk = dccp_msk(oldsk); |
514 | struct dccp_minisock *newdmsk = dccp_msk(newsk); | |
afe00251 AB |
515 | struct dccp_opt_pend *opt; |
516 | int rc = 0; | |
517 | ||
a4bf3902 ACM |
518 | INIT_LIST_HEAD(&newdmsk->dccpms_pending); |
519 | INIT_LIST_HEAD(&newdmsk->dccpms_conf); | |
afe00251 | 520 | |
a4bf3902 | 521 | list_for_each_entry(opt, &olddmsk->dccpms_pending, dccpop_node) { |
afe00251 AB |
522 | struct dccp_opt_pend *newopt; |
523 | /* copy the value of the option */ | |
eed73417 | 524 | u8 *val = kmemdup(opt->dccpop_val, opt->dccpop_len, GFP_ATOMIC); |
afe00251 AB |
525 | |
526 | if (val == NULL) | |
527 | goto out_clean; | |
afe00251 | 528 | |
eed73417 | 529 | newopt = kmemdup(opt, sizeof(*newopt), GFP_ATOMIC); |
afe00251 AB |
530 | if (newopt == NULL) { |
531 | kfree(val); | |
532 | goto out_clean; | |
533 | } | |
534 | ||
535 | /* insert the option */ | |
afe00251 | 536 | newopt->dccpop_val = val; |
a4bf3902 | 537 | list_add_tail(&newopt->dccpop_node, &newdmsk->dccpms_pending); |
afe00251 AB |
538 | |
539 | /* XXX what happens with backlogs and multiple connections at | |
540 | * once... | |
541 | */ | |
542 | /* the master socket no longer needs to worry about confirms */ | |
68907dad | 543 | opt->dccpop_sc = NULL; /* it's not a memleak---new socket has it */ |
afe00251 AB |
544 | |
545 | /* reset state for a new socket */ | |
546 | opt->dccpop_conf = 0; | |
547 | } | |
548 | ||
549 | /* XXX not doing anything about the conf queue */ | |
550 | ||
551 | out: | |
552 | return rc; | |
553 | ||
554 | out_clean: | |
8ca0d17b | 555 | dccp_feat_clean(newdmsk); |
afe00251 AB |
556 | rc = -ENOMEM; |
557 | goto out; | |
558 | } | |
559 | ||
560 | EXPORT_SYMBOL_GPL(dccp_feat_clone); | |
561 | ||
8ca0d17b ACM |
562 | static int __dccp_feat_init(struct dccp_minisock *dmsk, u8 type, u8 feat, |
563 | u8 *val, u8 len) | |
afe00251 AB |
564 | { |
565 | int rc = -ENOMEM; | |
eed73417 | 566 | u8 *copy = kmemdup(val, len, GFP_KERNEL); |
afe00251 AB |
567 | |
568 | if (copy != NULL) { | |
8ca0d17b | 569 | rc = dccp_feat_change(dmsk, type, feat, copy, len, GFP_KERNEL); |
afe00251 AB |
570 | if (rc) |
571 | kfree(copy); | |
572 | } | |
573 | return rc; | |
574 | } | |
575 | ||
8ca0d17b | 576 | int dccp_feat_init(struct dccp_minisock *dmsk) |
afe00251 | 577 | { |
afe00251 AB |
578 | int rc; |
579 | ||
a4bf3902 ACM |
580 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
581 | INIT_LIST_HEAD(&dmsk->dccpms_conf); | |
afe00251 AB |
582 | |
583 | /* CCID L */ | |
8ca0d17b | 584 | rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_L, DCCPF_CCID, |
a4bf3902 | 585 | &dmsk->dccpms_tx_ccid, 1); |
afe00251 AB |
586 | if (rc) |
587 | goto out; | |
588 | ||
589 | /* CCID R */ | |
8ca0d17b | 590 | rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_R, DCCPF_CCID, |
a4bf3902 | 591 | &dmsk->dccpms_rx_ccid, 1); |
afe00251 AB |
592 | if (rc) |
593 | goto out; | |
594 | ||
595 | /* Ack ratio */ | |
8ca0d17b | 596 | rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_L, DCCPF_ACK_RATIO, |
a4bf3902 | 597 | &dmsk->dccpms_ack_ratio, 1); |
afe00251 AB |
598 | out: |
599 | return rc; | |
600 | } | |
601 | ||
602 | EXPORT_SYMBOL_GPL(dccp_feat_init); | |
c02fdc0e GR |
603 | |
604 | #ifdef CONFIG_IP_DCCP_DEBUG | |
605 | const char *dccp_feat_typename(const u8 type) | |
606 | { | |
607 | switch(type) { | |
608 | case DCCPO_CHANGE_L: return("ChangeL"); | |
609 | case DCCPO_CONFIRM_L: return("ConfirmL"); | |
610 | case DCCPO_CHANGE_R: return("ChangeR"); | |
611 | case DCCPO_CONFIRM_R: return("ConfirmR"); | |
612 | /* the following case must not appear in feature negotation */ | |
8109b02b | 613 | default: dccp_pr_debug("unknown type %d [BUG!]\n", type); |
c02fdc0e GR |
614 | } |
615 | return NULL; | |
616 | } | |
617 | ||
618 | EXPORT_SYMBOL_GPL(dccp_feat_typename); | |
619 | ||
620 | const char *dccp_feat_name(const u8 feat) | |
621 | { | |
622 | static const char *feature_names[] = { | |
623 | [DCCPF_RESERVED] = "Reserved", | |
624 | [DCCPF_CCID] = "CCID", | |
625 | [DCCPF_SHORT_SEQNOS] = "Allow Short Seqnos", | |
626 | [DCCPF_SEQUENCE_WINDOW] = "Sequence Window", | |
627 | [DCCPF_ECN_INCAPABLE] = "ECN Incapable", | |
628 | [DCCPF_ACK_RATIO] = "Ack Ratio", | |
629 | [DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector", | |
630 | [DCCPF_SEND_NDP_COUNT] = "Send NDP Count", | |
631 | [DCCPF_MIN_CSUM_COVER] = "Min. Csum Coverage", | |
632 | [DCCPF_DATA_CHECKSUM] = "Send Data Checksum", | |
633 | }; | |
634 | if (feat >= DCCPF_MIN_CCID_SPECIFIC) | |
635 | return "CCID-specific"; | |
636 | ||
637 | if (dccp_feat_is_reserved(feat)) | |
638 | return feature_names[DCCPF_RESERVED]; | |
639 | ||
640 | return feature_names[feat]; | |
641 | } | |
642 | ||
643 | EXPORT_SYMBOL_GPL(dccp_feat_name); | |
644 | #endif /* CONFIG_IP_DCCP_DEBUG */ |