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Andrea Bittauafe00252006-03-20 17:43:56 -08001/*
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
Andrea Bittauafe00252006-03-20 17:43:56 -080013#include <linux/module.h>
14
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080015#include "ccid.h"
Andrea Bittauafe00252006-03-20 17:43:56 -080016#include "feat.h"
17
18#define DCCP_FEAT_SP_NOAGREE (-123)
19
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -080020int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
21 u8 *val, u8 len, gfp_t gfp)
Andrea Bittauafe00252006-03-20 17:43:56 -080022{
Andrea Bittauafe00252006-03-20 17:43:56 -080023 struct dccp_opt_pend *opt;
24
Gerrit Renkerc02fdc02006-11-14 12:48:10 -020025 dccp_feat_debug(type, feature, *val);
Andrea Bittauafe00252006-03-20 17:43:56 -080026
Gerrit Renkerc02fdc02006-11-14 12:48:10 -020027 if (!dccp_feat_is_valid_type(type)) {
Gerrit Renker59348b12006-11-20 18:39:23 -020028 DCCP_WARN("option type %d invalid in negotiation\n", type);
Gerrit Renkerc02fdc02006-11-14 12:48:10 -020029 return 1;
30 }
31 if (!dccp_feat_is_valid_length(type, feature, len)) {
Gerrit Renker59348b12006-11-20 18:39:23 -020032 DCCP_WARN("invalid length %d\n", len);
Gerrit Renkerc02fdc02006-11-14 12:48:10 -020033 return 1;
34 }
35 /* XXX add further sanity checks */
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080036
Andrea Bittauafe00252006-03-20 17:43:56 -080037 /* check if that feature is already being negotiated */
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -080038 list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
Andrea Bittauafe00252006-03-20 17:43:56 -080039 /* 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
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -080066 list_add_tail(&opt->dccpop_node, &dmsk->dccpms_pending);
Andrea Bittauafe00252006-03-20 17:43:56 -080067 return 0;
68}
69
70EXPORT_SYMBOL_GPL(dccp_feat_change);
71
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080072static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr)
73{
74 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -080075 struct dccp_minisock *dmsk = dccp_msk(sk);
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080076 /* figure out if we are changing our CCID or the peer's */
77 const int rx = type == DCCPO_CHANGE_R;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -080078 const u8 ccid_nr = rx ? dmsk->dccpms_rx_ccid : dmsk->dccpms_tx_ccid;
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080079 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;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -080092 dmsk->dccpms_rx_ccid = new_ccid_nr;
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080093 } else {
94 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
95 dp->dccps_hc_tx_ccid = new_ccid;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -080096 dmsk->dccpms_tx_ccid = new_ccid_nr;
Andrea Bittau6ffd30f2006-03-20 19:22:37 -080097 }
98
99 return 0;
100}
101
Andrea Bittauafe00252006-03-20 17:43:56 -0800102/* XXX taking only u8 vals */
103static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val)
104{
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200105 dccp_feat_debug(type, feat, val);
Andrea Bittau6ffd30f2006-03-20 19:22:37 -0800106
107 switch (feat) {
108 case DCCPF_CCID:
109 return dccp_feat_update_ccid(sk, type, val);
110 default:
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200111 dccp_pr_debug("UNIMPLEMENTED: %s(%d, ...)\n",
112 dccp_feat_typename(type), feat);
Andrea Bittau6ffd30f2006-03-20 19:22:37 -0800113 break;
114 }
Andrea Bittauafe00252006-03-20 17:43:56 -0800115 return 0;
116}
117
118static 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)
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800166 res = &dccp_msk(sk)->dccpms_tx_ccid;
Andrea Bittauafe00252006-03-20 17:43:56 -0800167 else
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800168 res = &dccp_msk(sk)->dccpms_rx_ccid;
Andrea Bittauafe00252006-03-20 17:43:56 -0800169 break;
170
171 default:
Gerrit Renker59348b12006-11-20 18:39:23 -0200172 DCCP_BUG("Fell through, feat=%d", opt->dccpop_feat);
173 /* XXX implement res */
Andrea Bittauafe00252006-03-20 17:43:56 -0800174 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);
Randy Dunlap68907da2006-03-29 13:58:25 -0800214 opt->dccpop_sc = NULL;
Andrea Bittauafe00252006-03-20 17:43:56 -0800215 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
232static int dccp_feat_sp(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
233{
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800234 struct dccp_minisock *dmsk = dccp_msk(sk);
Andrea Bittauafe00252006-03-20 17:43:56 -0800235 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 */
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800250 list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
Andrea Bittauafe00252006-03-20 17:43:56 -0800251 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
269static int dccp_feat_nn(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
270{
271 struct dccp_opt_pend *opt;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800272 struct dccp_minisock *dmsk = dccp_msk(sk);
Andrea Bittauafe00252006-03-20 17:43:56 -0800273 u8 *copy;
274 int rc;
275
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200276 /* 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);
Andrea Bittauafe00252006-03-20 17:43:56 -0800280 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
Arnaldo Carvalho de Meloeed73412006-11-17 12:21:43 -0200290 copy = kmemdup(val, len, GFP_ATOMIC);
Andrea Bittauafe00252006-03-20 17:43:56 -0800291 if (copy == NULL) {
292 kfree(opt);
293 return -ENOMEM;
294 }
Andrea Bittauafe00252006-03-20 17:43:56 -0800295
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
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200309 dccp_feat_debug(type, feature, *copy);
310
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800311 list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
Andrea Bittauafe00252006-03-20 17:43:56 -0800312
313 return 0;
314}
315
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800316static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk,
317 u8 type, u8 feature)
Andrea Bittauafe00252006-03-20 17:43:56 -0800318{
Andrea Bittauafe00252006-03-20 17:43:56 -0800319 /* 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
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200329 switch (type) {
Jesper Juhle576de82007-08-10 15:23:54 -0700330 case DCCPO_CHANGE_L:
331 opt->dccpop_type = DCCPO_CONFIRM_R;
332 break;
333 case DCCPO_CHANGE_R:
334 opt->dccpop_type = DCCPO_CONFIRM_L;
335 break;
336 default:
337 DCCP_WARN("invalid type %d\n", type);
338 kfree(opt);
339 return;
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200340 }
Andrea Bittauafe00252006-03-20 17:43:56 -0800341 opt->dccpop_feat = feature;
Randy Dunlap68907da2006-03-29 13:58:25 -0800342 opt->dccpop_val = NULL;
Andrea Bittauafe00252006-03-20 17:43:56 -0800343 opt->dccpop_len = 0;
344
345 /* change feature */
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200346 dccp_pr_debug("Empty %s(%d)\n", dccp_feat_typename(type), feature);
347
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800348 list_add_tail(&opt->dccpop_node, &dmsk->dccpms_conf);
Andrea Bittauafe00252006-03-20 17:43:56 -0800349}
350
351static void dccp_feat_flush_confirm(struct sock *sk)
352{
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800353 struct dccp_minisock *dmsk = dccp_msk(sk);
Andrea Bittauafe00252006-03-20 17:43:56 -0800354 /* Check if there is anything to confirm in the first place */
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800355 int yes = !list_empty(&dmsk->dccpms_conf);
Andrea Bittauafe00252006-03-20 17:43:56 -0800356
357 if (!yes) {
358 struct dccp_opt_pend *opt;
359
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800360 list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
Andrea Bittauafe00252006-03-20 17:43:56 -0800361 if (opt->dccpop_conf) {
362 yes = 1;
363 break;
364 }
365 }
366 }
367
368 if (!yes)
369 return;
370
371 /* OK there is something to confirm... */
372 /* XXX check if packet is in flight? Send delayed ack?? */
373 if (sk->sk_state == DCCP_OPEN)
374 dccp_send_ack(sk);
375}
376
377int dccp_feat_change_recv(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len)
378{
379 int rc;
380
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200381 dccp_feat_debug(type, feature, *val);
Andrea Bittauafe00252006-03-20 17:43:56 -0800382
383 /* figure out if it's SP or NN feature */
384 switch (feature) {
385 /* deal with SP features */
386 case DCCPF_CCID:
387 rc = dccp_feat_sp(sk, type, feature, val, len);
388 break;
389
390 /* deal with NN features */
391 case DCCPF_ACK_RATIO:
392 rc = dccp_feat_nn(sk, type, feature, val, len);
393 break;
394
395 /* XXX implement other features */
396 default:
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200397 dccp_pr_debug("UNIMPLEMENTED: not handling %s(%d, ...)\n",
398 dccp_feat_typename(type), feature);
Andrea Bittauafe00252006-03-20 17:43:56 -0800399 rc = -EFAULT;
400 break;
401 }
402
403 /* check if there were problems changing features */
404 if (rc) {
405 /* If we don't agree on SP, we sent a confirm for old value.
406 * However we propagate rc to caller in case option was
407 * mandatory
408 */
409 if (rc != DCCP_FEAT_SP_NOAGREE)
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800410 dccp_feat_empty_confirm(dccp_msk(sk), type, feature);
Andrea Bittauafe00252006-03-20 17:43:56 -0800411 }
412
413 /* generate the confirm [if required] */
414 dccp_feat_flush_confirm(sk);
415
416 return rc;
417}
418
419EXPORT_SYMBOL_GPL(dccp_feat_change_recv);
420
421int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
422 u8 *val, u8 len)
423{
424 u8 t;
425 struct dccp_opt_pend *opt;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800426 struct dccp_minisock *dmsk = dccp_msk(sk);
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200427 int found = 0;
Andrea Bittauafe00252006-03-20 17:43:56 -0800428 int all_confirmed = 1;
429
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200430 dccp_feat_debug(type, feature, *val);
Andrea Bittauafe00252006-03-20 17:43:56 -0800431
432 /* locate our change request */
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200433 switch (type) {
434 case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break;
435 case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200436 default: DCCP_WARN("invalid type %d\n", type);
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200437 return 1;
438
439 }
440 /* XXX sanity check feature value */
Andrea Bittauafe00252006-03-20 17:43:56 -0800441
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800442 list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
Andrea Bittauafe00252006-03-20 17:43:56 -0800443 if (!opt->dccpop_conf && opt->dccpop_type == t &&
444 opt->dccpop_feat == feature) {
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200445 found = 1;
446 dccp_pr_debug("feature %d found\n", opt->dccpop_feat);
447
Andrea Bittauafe00252006-03-20 17:43:56 -0800448 /* XXX do sanity check */
449
450 opt->dccpop_conf = 1;
451
452 /* We got a confirmation---change the option */
453 dccp_feat_update(sk, opt->dccpop_type,
454 opt->dccpop_feat, *val);
455
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200456 /* XXX check the return value of dccp_feat_update */
Andrea Bittauafe00252006-03-20 17:43:56 -0800457 break;
458 }
459
460 if (!opt->dccpop_conf)
461 all_confirmed = 0;
462 }
463
464 /* fix re-transmit timer */
465 /* XXX gotta make sure that no option negotiation occurs during
466 * connection shutdown. Consider that the CLOSEREQ is sent and timer is
467 * on. if all options are confirmed it might kill timer which should
468 * remain alive until close is received.
469 */
470 if (all_confirmed) {
471 dccp_pr_debug("clear feat negotiation timer %p\n", sk);
472 inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS);
473 }
474
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200475 if (!found)
476 dccp_pr_debug("%s(%d, ...) never requested\n",
477 dccp_feat_typename(type), feature);
Andrea Bittauafe00252006-03-20 17:43:56 -0800478 return 0;
479}
480
481EXPORT_SYMBOL_GPL(dccp_feat_confirm_recv);
482
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800483void dccp_feat_clean(struct dccp_minisock *dmsk)
Andrea Bittauafe00252006-03-20 17:43:56 -0800484{
Andrea Bittauafe00252006-03-20 17:43:56 -0800485 struct dccp_opt_pend *opt, *next;
486
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800487 list_for_each_entry_safe(opt, next, &dmsk->dccpms_pending,
Andrea Bittauafe00252006-03-20 17:43:56 -0800488 dccpop_node) {
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900489 BUG_ON(opt->dccpop_val == NULL);
490 kfree(opt->dccpop_val);
Andrea Bittauafe00252006-03-20 17:43:56 -0800491
492 if (opt->dccpop_sc != NULL) {
493 BUG_ON(opt->dccpop_sc->dccpoc_val == NULL);
494 kfree(opt->dccpop_sc->dccpoc_val);
495 kfree(opt->dccpop_sc);
496 }
497
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900498 kfree(opt);
499 }
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800500 INIT_LIST_HEAD(&dmsk->dccpms_pending);
Andrea Bittauafe00252006-03-20 17:43:56 -0800501
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800502 list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
Andrea Bittauafe00252006-03-20 17:43:56 -0800503 BUG_ON(opt == NULL);
504 if (opt->dccpop_val != NULL)
505 kfree(opt->dccpop_val);
506 kfree(opt);
507 }
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800508 INIT_LIST_HEAD(&dmsk->dccpms_conf);
Andrea Bittauafe00252006-03-20 17:43:56 -0800509}
510
511EXPORT_SYMBOL_GPL(dccp_feat_clean);
512
513/* this is to be called only when a listening sock creates its child. It is
514 * assumed by the function---the confirm is not duplicated, but rather it is
515 * "passed on".
516 */
517int dccp_feat_clone(struct sock *oldsk, struct sock *newsk)
518{
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800519 struct dccp_minisock *olddmsk = dccp_msk(oldsk);
520 struct dccp_minisock *newdmsk = dccp_msk(newsk);
Andrea Bittauafe00252006-03-20 17:43:56 -0800521 struct dccp_opt_pend *opt;
522 int rc = 0;
523
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800524 INIT_LIST_HEAD(&newdmsk->dccpms_pending);
525 INIT_LIST_HEAD(&newdmsk->dccpms_conf);
Andrea Bittauafe00252006-03-20 17:43:56 -0800526
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800527 list_for_each_entry(opt, &olddmsk->dccpms_pending, dccpop_node) {
Andrea Bittauafe00252006-03-20 17:43:56 -0800528 struct dccp_opt_pend *newopt;
529 /* copy the value of the option */
Arnaldo Carvalho de Meloeed73412006-11-17 12:21:43 -0200530 u8 *val = kmemdup(opt->dccpop_val, opt->dccpop_len, GFP_ATOMIC);
Andrea Bittauafe00252006-03-20 17:43:56 -0800531
532 if (val == NULL)
533 goto out_clean;
Andrea Bittauafe00252006-03-20 17:43:56 -0800534
Arnaldo Carvalho de Meloeed73412006-11-17 12:21:43 -0200535 newopt = kmemdup(opt, sizeof(*newopt), GFP_ATOMIC);
Andrea Bittauafe00252006-03-20 17:43:56 -0800536 if (newopt == NULL) {
537 kfree(val);
538 goto out_clean;
539 }
540
541 /* insert the option */
Andrea Bittauafe00252006-03-20 17:43:56 -0800542 newopt->dccpop_val = val;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800543 list_add_tail(&newopt->dccpop_node, &newdmsk->dccpms_pending);
Andrea Bittauafe00252006-03-20 17:43:56 -0800544
545 /* XXX what happens with backlogs and multiple connections at
546 * once...
547 */
548 /* the master socket no longer needs to worry about confirms */
Randy Dunlap68907da2006-03-29 13:58:25 -0800549 opt->dccpop_sc = NULL; /* it's not a memleak---new socket has it */
Andrea Bittauafe00252006-03-20 17:43:56 -0800550
551 /* reset state for a new socket */
552 opt->dccpop_conf = 0;
553 }
554
555 /* XXX not doing anything about the conf queue */
556
557out:
558 return rc;
559
560out_clean:
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800561 dccp_feat_clean(newdmsk);
Andrea Bittauafe00252006-03-20 17:43:56 -0800562 rc = -ENOMEM;
563 goto out;
564}
565
566EXPORT_SYMBOL_GPL(dccp_feat_clone);
567
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800568static int __dccp_feat_init(struct dccp_minisock *dmsk, u8 type, u8 feat,
569 u8 *val, u8 len)
Andrea Bittauafe00252006-03-20 17:43:56 -0800570{
571 int rc = -ENOMEM;
Arnaldo Carvalho de Meloeed73412006-11-17 12:21:43 -0200572 u8 *copy = kmemdup(val, len, GFP_KERNEL);
Andrea Bittauafe00252006-03-20 17:43:56 -0800573
574 if (copy != NULL) {
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800575 rc = dccp_feat_change(dmsk, type, feat, copy, len, GFP_KERNEL);
Andrea Bittauafe00252006-03-20 17:43:56 -0800576 if (rc)
577 kfree(copy);
578 }
579 return rc;
580}
581
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800582int dccp_feat_init(struct dccp_minisock *dmsk)
Andrea Bittauafe00252006-03-20 17:43:56 -0800583{
Andrea Bittauafe00252006-03-20 17:43:56 -0800584 int rc;
585
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800586 INIT_LIST_HEAD(&dmsk->dccpms_pending);
587 INIT_LIST_HEAD(&dmsk->dccpms_conf);
Andrea Bittauafe00252006-03-20 17:43:56 -0800588
589 /* CCID L */
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800590 rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_L, DCCPF_CCID,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800591 &dmsk->dccpms_tx_ccid, 1);
Andrea Bittauafe00252006-03-20 17:43:56 -0800592 if (rc)
593 goto out;
594
595 /* CCID R */
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800596 rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_R, DCCPF_CCID,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800597 &dmsk->dccpms_rx_ccid, 1);
Andrea Bittauafe00252006-03-20 17:43:56 -0800598 if (rc)
599 goto out;
600
601 /* Ack ratio */
Arnaldo Carvalho de Melo8ca0d172006-03-20 22:51:53 -0800602 rc = __dccp_feat_init(dmsk, DCCPO_CHANGE_L, DCCPF_ACK_RATIO,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800603 &dmsk->dccpms_ack_ratio, 1);
Andrea Bittauafe00252006-03-20 17:43:56 -0800604out:
605 return rc;
606}
607
608EXPORT_SYMBOL_GPL(dccp_feat_init);
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200609
610#ifdef CONFIG_IP_DCCP_DEBUG
611const char *dccp_feat_typename(const u8 type)
612{
613 switch(type) {
614 case DCCPO_CHANGE_L: return("ChangeL");
615 case DCCPO_CONFIRM_L: return("ConfirmL");
616 case DCCPO_CHANGE_R: return("ChangeR");
617 case DCCPO_CONFIRM_R: return("ConfirmR");
618 /* the following case must not appear in feature negotation */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200619 default: dccp_pr_debug("unknown type %d [BUG!]\n", type);
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200620 }
621 return NULL;
622}
623
624EXPORT_SYMBOL_GPL(dccp_feat_typename);
625
626const char *dccp_feat_name(const u8 feat)
627{
628 static const char *feature_names[] = {
629 [DCCPF_RESERVED] = "Reserved",
630 [DCCPF_CCID] = "CCID",
631 [DCCPF_SHORT_SEQNOS] = "Allow Short Seqnos",
632 [DCCPF_SEQUENCE_WINDOW] = "Sequence Window",
633 [DCCPF_ECN_INCAPABLE] = "ECN Incapable",
634 [DCCPF_ACK_RATIO] = "Ack Ratio",
635 [DCCPF_SEND_ACK_VECTOR] = "Send ACK Vector",
636 [DCCPF_SEND_NDP_COUNT] = "Send NDP Count",
637 [DCCPF_MIN_CSUM_COVER] = "Min. Csum Coverage",
638 [DCCPF_DATA_CHECKSUM] = "Send Data Checksum",
639 };
640 if (feat >= DCCPF_MIN_CCID_SPECIFIC)
641 return "CCID-specific";
642
643 if (dccp_feat_is_reserved(feat))
644 return feature_names[DCCPF_RESERVED];
645
646 return feature_names[feat];
647}
648
649EXPORT_SYMBOL_GPL(dccp_feat_name);
650#endif /* CONFIG_IP_DCCP_DEBUG */