blob: ea6d0e91e5117ac8f5ca1b5dbbce4a5c53269696 [file] [log] [blame]
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001/*
2 * net/dccp/output.c
3 *
4 * An implementation of the DCCP protocol
5 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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
13#include <linux/config.h>
14#include <linux/dccp.h>
15#include <linux/skbuff.h>
16
17#include <net/sock.h>
18
19#include "ccid.h"
20#include "dccp.h"
21
22static inline void dccp_event_ack_sent(struct sock *sk)
23{
24 inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
25}
26
27/*
28 * All SKB's seen here are completely headerless. It is our
29 * job to build the DCCP header, and pass the packet down to
30 * IP so it can do the same plus pass the packet off to the
31 * device.
32 */
33int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
34{
35 if (likely(skb != NULL)) {
36 const struct inet_sock *inet = inet_sk(sk);
37 struct dccp_sock *dp = dccp_sk(sk);
38 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
39 struct dccp_hdr *dh;
40 /* XXX For now we're using only 48 bits sequence numbers */
41 const int dccp_header_size = sizeof(*dh) +
42 sizeof(struct dccp_hdr_ext) +
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030043 dccp_packet_hdr_len(dcb->dccpd_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070044 int err, set_ack = 1;
45 u64 ackno = dp->dccps_gsr;
46
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070047 dccp_inc_seqno(&dp->dccps_gss);
48
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070049 switch (dcb->dccpd_type) {
50 case DCCP_PKT_DATA:
51 set_ack = 0;
52 break;
53 case DCCP_PKT_SYNC:
54 case DCCP_PKT_SYNCACK:
55 ackno = dcb->dccpd_seq;
56 break;
57 }
Arnaldo Carvalho de Melo24117722005-08-21 05:40:16 -030058
59 dcb->dccpd_seq = dp->dccps_gss;
60 dccp_insert_options(sk, skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070061
62 skb->h.raw = skb_push(skb, dccp_header_size);
63 dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030064 /*
65 * Data packets are not cloned as they are never retransmitted
66 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070067 if (skb_cloned(skb))
68 skb_set_owner_w(skb, sk);
69
70 /* Build DCCP header and checksum it. */
71 memset(dh, 0, dccp_header_size);
72 dh->dccph_type = dcb->dccpd_type;
73 dh->dccph_sport = inet->sport;
74 dh->dccph_dport = inet->dport;
75 dh->dccph_doff = (dccp_header_size + dcb->dccpd_opt_len) / 4;
76 dh->dccph_ccval = dcb->dccpd_ccval;
77 /* XXX For now we're using only 48 bits sequence numbers */
78 dh->dccph_x = 1;
79
80 dp->dccps_awh = dp->dccps_gss;
81 dccp_hdr_set_seq(dh, dp->dccps_gss);
82 if (set_ack)
83 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), ackno);
84
85 switch (dcb->dccpd_type) {
86 case DCCP_PKT_REQUEST:
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030087 dccp_hdr_request(skb)->dccph_req_service =
88 dcb->dccpd_service;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070089 break;
90 case DCCP_PKT_RESET:
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030091 dccp_hdr_reset(skb)->dccph_reset_code =
92 dcb->dccpd_reset_code;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070093 break;
94 }
95
Yoshifumi Nishida95b81ef2005-08-09 20:15:35 -070096 dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr,
97 inet->daddr);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070098
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -070099 if (set_ack)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700100 dccp_event_ack_sent(sk);
101
102 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
103
104 err = ip_queue_xmit(skb, 0);
105 if (err <= 0)
106 return err;
107
108 /* NET_XMIT_CN is special. It does not guarantee,
109 * that this packet is lost. It tells that device
110 * is about to start to drop packets or already
111 * drops some packets of the same priority and
112 * invokes us to send less aggressively.
113 */
114 return err == NET_XMIT_CN ? 0 : err;
115 }
116 return -ENOBUFS;
117}
118
119unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
120{
121 struct dccp_sock *dp = dccp_sk(sk);
122 int mss_now;
123
124 /*
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300125 * FIXME: we really should be using the af_specific thing to support
126 * IPv6.
127 * mss_now = pmtu - tp->af_specific->net_header_len -
128 * sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700129 */
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300130 mss_now = pmtu - sizeof(struct iphdr) - sizeof(struct dccp_hdr) -
131 sizeof(struct dccp_hdr_ext);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700132
133 /* Now subtract optional transport overhead */
134 mss_now -= dp->dccps_ext_header_len;
135
136 /*
137 * FIXME: this should come from the CCID infrastructure, where, say,
138 * TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets
139 * put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED
140 * TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to
141 * make it a multiple of 4
142 */
143
144 mss_now -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4;
145
146 /* And store cached results */
147 dp->dccps_pmtu_cookie = pmtu;
148 dp->dccps_mss_cache = mss_now;
149
150 return mss_now;
151}
152
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300153void dccp_write_space(struct sock *sk)
154{
155 read_lock(&sk->sk_callback_lock);
156
157 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
158 wake_up_interruptible(sk->sk_sleep);
159 /* Should agree with poll, otherwise some programs break */
160 if (sock_writeable(sk))
161 sk_wake_async(sk, 2, POLL_OUT);
162
163 read_unlock(&sk->sk_callback_lock);
164}
165
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300166/**
167 * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
168 * @sk: socket to wait for
169 * @timeo: for how long
170 */
171static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb,
172 long *timeo)
173{
174 struct dccp_sock *dp = dccp_sk(sk);
175 DEFINE_WAIT(wait);
176 long delay;
177 int rc;
178
179 while (1) {
180 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
181
182 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
183 goto do_error;
184 if (!*timeo)
185 goto do_nonblock;
186 if (signal_pending(current))
187 goto do_interrupted;
188
189 rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
190 skb->len);
191 if (rc <= 0)
192 break;
193 delay = msecs_to_jiffies(rc);
194 if (delay > *timeo || delay < 0)
195 goto do_nonblock;
196
197 sk->sk_write_pending++;
198 release_sock(sk);
199 *timeo -= schedule_timeout(delay);
200 lock_sock(sk);
201 sk->sk_write_pending--;
202 }
203out:
204 finish_wait(sk->sk_sleep, &wait);
205 return rc;
206
207do_error:
208 rc = -EPIPE;
209 goto out;
210do_nonblock:
211 rc = -EAGAIN;
212 goto out;
213do_interrupted:
214 rc = sock_intr_errno(*timeo);
215 goto out;
216}
217
218int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo)
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700219{
220 const struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300221 int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
222 skb->len);
223
224 if (err > 0)
225 err = dccp_wait_for_ccid(sk, skb, timeo);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700226
227 if (err == 0) {
228 const struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
229 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300230 const int len = skb->len;
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700231
232 if (sk->sk_state == DCCP_PARTOPEN) {
233 /* See 8.1.5. Handshake Completion */
234 inet_csk_schedule_ack(sk);
235 inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
236 inet_csk(sk)->icsk_rto,
237 DCCP_RTO_MAX);
238 dcb->dccpd_type = DCCP_PKT_DATAACK;
239 /*
240 * FIXME: we really should have a
241 * dccps_ack_pending or use icsk.
242 */
243 } else if (inet_csk_ack_scheduled(sk) ||
Arnaldo Carvalho de Meloa4beb1b2005-08-23 21:50:45 -0700244 dp->dccps_timestamp_echo != 0 ||
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700245 (dp->dccps_options.dccpo_send_ack_vector &&
246 ap->dccpap_buf_ackno != DCCP_MAX_SEQNO + 1 &&
247 ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1))
248 dcb->dccpd_type = DCCP_PKT_DATAACK;
249 else
250 dcb->dccpd_type = DCCP_PKT_DATA;
251
252 err = dccp_transmit_skb(sk, skb);
253 ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
254 }
255
256 return err;
257}
258
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700259int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
260{
261 if (inet_sk_rebuild_header(sk) != 0)
262 return -EHOSTUNREACH; /* Routing failure or similar. */
263
264 return dccp_transmit_skb(sk, (skb_cloned(skb) ?
265 pskb_copy(skb, GFP_ATOMIC):
266 skb_clone(skb, GFP_ATOMIC)));
267}
268
269struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
270 struct request_sock *req)
271{
272 struct dccp_hdr *dh;
273 const int dccp_header_size = sizeof(struct dccp_hdr) +
274 sizeof(struct dccp_hdr_ext) +
275 sizeof(struct dccp_hdr_response);
276 struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
277 dccp_header_size, 1,
278 GFP_ATOMIC);
279 if (skb == NULL)
280 return NULL;
281
282 /* Reserve space for headers. */
283 skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
284
285 skb->dst = dst_clone(dst);
286 skb->csum = 0;
287
288 DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
289 DCCP_SKB_CB(skb)->dccpd_seq = dccp_rsk(req)->dreq_iss;
290 dccp_insert_options(sk, skb);
291
292 skb->h.raw = skb_push(skb, dccp_header_size);
293
294 dh = dccp_hdr(skb);
295 memset(dh, 0, dccp_header_size);
296
297 dh->dccph_sport = inet_sk(sk)->sport;
298 dh->dccph_dport = inet_rsk(req)->rmt_port;
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300299 dh->dccph_doff = (dccp_header_size +
300 DCCP_SKB_CB(skb)->dccpd_opt_len) / 4;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700301 dh->dccph_type = DCCP_PKT_RESPONSE;
302 dh->dccph_x = 1;
303 dccp_hdr_set_seq(dh, dccp_rsk(req)->dreq_iss);
304 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dccp_rsk(req)->dreq_isr);
305
Yoshifumi Nishida95b81ef2005-08-09 20:15:35 -0700306 dh->dccph_checksum = dccp_v4_checksum(skb, inet_rsk(req)->loc_addr,
307 inet_rsk(req)->rmt_addr);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700308
309 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
310 return skb;
311}
312
313struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
314 const enum dccp_reset_codes code)
315
316{
317 struct dccp_hdr *dh;
318 struct dccp_sock *dp = dccp_sk(sk);
319 const int dccp_header_size = sizeof(struct dccp_hdr) +
320 sizeof(struct dccp_hdr_ext) +
321 sizeof(struct dccp_hdr_reset);
322 struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
323 dccp_header_size, 1,
324 GFP_ATOMIC);
325 if (skb == NULL)
326 return NULL;
327
328 /* Reserve space for headers. */
329 skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
330
331 skb->dst = dst_clone(dst);
332 skb->csum = 0;
333
334 dccp_inc_seqno(&dp->dccps_gss);
335
336 DCCP_SKB_CB(skb)->dccpd_reset_code = code;
337 DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET;
338 DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss;
339 dccp_insert_options(sk, skb);
340
341 skb->h.raw = skb_push(skb, dccp_header_size);
342
343 dh = dccp_hdr(skb);
344 memset(dh, 0, dccp_header_size);
345
346 dh->dccph_sport = inet_sk(sk)->sport;
347 dh->dccph_dport = inet_sk(sk)->dport;
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300348 dh->dccph_doff = (dccp_header_size +
349 DCCP_SKB_CB(skb)->dccpd_opt_len) / 4;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700350 dh->dccph_type = DCCP_PKT_RESET;
351 dh->dccph_x = 1;
352 dccp_hdr_set_seq(dh, dp->dccps_gss);
353 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr);
354
355 dccp_hdr_reset(skb)->dccph_reset_code = code;
356
Yoshifumi Nishida95b81ef2005-08-09 20:15:35 -0700357 dh->dccph_checksum = dccp_v4_checksum(skb, inet_sk(sk)->saddr,
358 inet_sk(sk)->daddr);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700359
360 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
361 return skb;
362}
363
364/*
365 * Do all connect socket setups that can be done AF independent.
366 */
367static inline void dccp_connect_init(struct sock *sk)
368{
369 struct dst_entry *dst = __sk_dst_get(sk);
370 struct inet_connection_sock *icsk = inet_csk(sk);
371
372 sk->sk_err = 0;
373 sock_reset_flag(sk, SOCK_DONE);
374
375 dccp_sync_mss(sk, dst_mtu(dst));
376
377 /*
378 * FIXME: set dp->{dccps_swh,dccps_swl}, with
379 * something like dccp_inc_seq
380 */
381
382 icsk->icsk_retransmits = 0;
383}
384
385int dccp_connect(struct sock *sk)
386{
387 struct sk_buff *skb;
388 struct inet_connection_sock *icsk = inet_csk(sk);
389
390 dccp_connect_init(sk);
391
392 skb = alloc_skb(MAX_DCCP_HEADER + 15, sk->sk_allocation);
393 if (unlikely(skb == NULL))
394 return -ENOBUFS;
395
396 /* Reserve space for headers. */
397 skb_reserve(skb, MAX_DCCP_HEADER);
398
399 DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
400 /* FIXME: set service to something meaningful, coming
401 * from userspace*/
402 DCCP_SKB_CB(skb)->dccpd_service = 0;
403 skb->csum = 0;
404 skb_set_owner_w(skb, sk);
405
406 BUG_TRAP(sk->sk_send_head == NULL);
407 sk->sk_send_head = skb;
408 dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
409 DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS);
410
411 /* Timer for repeating the REQUEST until an answer. */
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700412 inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
413 icsk->icsk_rto, DCCP_RTO_MAX);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700414 return 0;
415}
416
417void dccp_send_ack(struct sock *sk)
418{
419 /* If we have been reset, we may not send again. */
420 if (sk->sk_state != DCCP_CLOSED) {
421 struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
422
423 if (skb == NULL) {
424 inet_csk_schedule_ack(sk);
425 inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN;
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300426 inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
427 TCP_DELACK_MAX,
428 DCCP_RTO_MAX);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700429 return;
430 }
431
432 /* Reserve space for headers */
433 skb_reserve(skb, MAX_DCCP_HEADER);
434 skb->csum = 0;
435 DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK;
436 skb_set_owner_w(skb, sk);
437 dccp_transmit_skb(sk, skb);
438 }
439}
440
441EXPORT_SYMBOL_GPL(dccp_send_ack);
442
443void dccp_send_delayed_ack(struct sock *sk)
444{
445 struct inet_connection_sock *icsk = inet_csk(sk);
446 /*
447 * FIXME: tune this timer. elapsed time fixes the skew, so no problem
448 * with using 2s, and active senders also piggyback the ACK into a
449 * DATAACK packet, so this is really for quiescent senders.
450 */
451 unsigned long timeout = jiffies + 2 * HZ;
452
453 /* Use new timeout only if there wasn't a older one earlier. */
454 if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) {
455 /* If delack timer was blocked or is about to expire,
456 * send ACK now.
457 *
458 * FIXME: check the "about to expire" part
459 */
460 if (icsk->icsk_ack.blocked) {
461 dccp_send_ack(sk);
462 return;
463 }
464
465 if (!time_before(timeout, icsk->icsk_ack.timeout))
466 timeout = icsk->icsk_ack.timeout;
467 }
468 icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER;
469 icsk->icsk_ack.timeout = timeout;
470 sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout);
471}
472
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300473void dccp_send_sync(struct sock *sk, const u64 seq,
474 const enum dccp_pkt_type pkt_type)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700475{
476 /*
477 * We are not putting this on the write queue, so
478 * dccp_transmit_skb() will set the ownership to this
479 * sock.
480 */
481 struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
482
483 if (skb == NULL)
484 /* FIXME: how to make sure the sync is sent? */
485 return;
486
487 /* Reserve space for headers and prepare control bits. */
488 skb_reserve(skb, MAX_DCCP_HEADER);
489 skb->csum = 0;
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300490 DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700491 DCCP_SKB_CB(skb)->dccpd_seq = seq;
492
493 skb_set_owner_w(skb, sk);
494 dccp_transmit_skb(sk, skb);
495}
496
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300497/*
498 * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This
499 * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under
500 * any circumstances.
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700501 */
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700502void dccp_send_close(struct sock *sk, const int active)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700503{
504 struct dccp_sock *dp = dccp_sk(sk);
505 struct sk_buff *skb;
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700506 const unsigned int prio = active ? GFP_KERNEL : GFP_ATOMIC;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700507
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700508 skb = alloc_skb(sk->sk_prot->max_header, prio);
509 if (skb == NULL)
510 return;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700511
512 /* Reserve space for headers and prepare control bits. */
513 skb_reserve(skb, sk->sk_prot->max_header);
514 skb->csum = 0;
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300515 DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ?
516 DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700517
518 skb_set_owner_w(skb, sk);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700519 if (active) {
520 BUG_TRAP(sk->sk_send_head == NULL);
521 sk->sk_send_head = skb;
522 dccp_transmit_skb(sk, skb_clone(skb, prio));
523 } else
524 dccp_transmit_skb(sk, skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700525}