Commit | Line | Data |
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7c657876 ACM |
1 | /* |
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 | ||
22 | static 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 | */ | |
33 | int 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) + | |
7690af3f | 43 | dccp_packet_hdr_len(dcb->dccpd_type); |
7c657876 ACM |
44 | int err, set_ack = 1; |
45 | u64 ackno = dp->dccps_gsr; | |
46 | ||
7c657876 ACM |
47 | dccp_inc_seqno(&dp->dccps_gss); |
48 | ||
7c657876 ACM |
49 | 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 | } | |
24117727 ACM |
58 | |
59 | dcb->dccpd_seq = dp->dccps_gss; | |
60 | dccp_insert_options(sk, skb); | |
7c657876 ACM |
61 | |
62 | skb->h.raw = skb_push(skb, dccp_header_size); | |
63 | dh = dccp_hdr(skb); | |
7690af3f ACM |
64 | /* |
65 | * Data packets are not cloned as they are never retransmitted | |
66 | */ | |
7c657876 ACM |
67 | 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: | |
7690af3f ACM |
87 | dccp_hdr_request(skb)->dccph_req_service = |
88 | dcb->dccpd_service; | |
7c657876 ACM |
89 | break; |
90 | case DCCP_PKT_RESET: | |
7690af3f ACM |
91 | dccp_hdr_reset(skb)->dccph_reset_code = |
92 | dcb->dccpd_reset_code; | |
7c657876 ACM |
93 | break; |
94 | } | |
95 | ||
95b81ef7 YN |
96 | dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, |
97 | inet->daddr); | |
7c657876 | 98 | |
7ad07e7c | 99 | if (set_ack) |
7c657876 ACM |
100 | 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 | ||
119 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu) | |
120 | { | |
121 | struct dccp_sock *dp = dccp_sk(sk); | |
122 | int mss_now; | |
123 | ||
124 | /* | |
7690af3f ACM |
125 | * 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); | |
7c657876 | 129 | */ |
7690af3f ACM |
130 | mss_now = pmtu - sizeof(struct iphdr) - sizeof(struct dccp_hdr) - |
131 | sizeof(struct dccp_hdr_ext); | |
7c657876 ACM |
132 | |
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 | ||
d6809c12 ACM |
153 | /** |
154 | * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet | |
155 | * @sk: socket to wait for | |
156 | * @timeo: for how long | |
157 | */ | |
158 | static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb, | |
159 | long *timeo) | |
160 | { | |
161 | struct dccp_sock *dp = dccp_sk(sk); | |
162 | DEFINE_WAIT(wait); | |
163 | long delay; | |
164 | int rc; | |
165 | ||
166 | while (1) { | |
167 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
168 | ||
169 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
170 | goto do_error; | |
171 | if (!*timeo) | |
172 | goto do_nonblock; | |
173 | if (signal_pending(current)) | |
174 | goto do_interrupted; | |
175 | ||
176 | rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, | |
177 | skb->len); | |
178 | if (rc <= 0) | |
179 | break; | |
180 | delay = msecs_to_jiffies(rc); | |
181 | if (delay > *timeo || delay < 0) | |
182 | goto do_nonblock; | |
183 | ||
184 | sk->sk_write_pending++; | |
185 | release_sock(sk); | |
186 | *timeo -= schedule_timeout(delay); | |
187 | lock_sock(sk); | |
188 | sk->sk_write_pending--; | |
189 | } | |
190 | out: | |
191 | finish_wait(sk->sk_sleep, &wait); | |
192 | return rc; | |
193 | ||
194 | do_error: | |
195 | rc = -EPIPE; | |
196 | goto out; | |
197 | do_nonblock: | |
198 | rc = -EAGAIN; | |
199 | goto out; | |
200 | do_interrupted: | |
201 | rc = sock_intr_errno(*timeo); | |
202 | goto out; | |
203 | } | |
204 | ||
205 | int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo) | |
27258ee5 ACM |
206 | { |
207 | const struct dccp_sock *dp = dccp_sk(sk); | |
d6809c12 ACM |
208 | int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, |
209 | skb->len); | |
210 | ||
211 | if (err > 0) | |
212 | err = dccp_wait_for_ccid(sk, skb, timeo); | |
27258ee5 ACM |
213 | |
214 | if (err == 0) { | |
215 | const struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts; | |
216 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); | |
d6809c12 | 217 | const int len = skb->len; |
27258ee5 ACM |
218 | |
219 | if (sk->sk_state == DCCP_PARTOPEN) { | |
220 | /* See 8.1.5. Handshake Completion */ | |
221 | inet_csk_schedule_ack(sk); | |
222 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, | |
223 | inet_csk(sk)->icsk_rto, | |
224 | DCCP_RTO_MAX); | |
225 | dcb->dccpd_type = DCCP_PKT_DATAACK; | |
226 | /* | |
227 | * FIXME: we really should have a | |
228 | * dccps_ack_pending or use icsk. | |
229 | */ | |
230 | } else if (inet_csk_ack_scheduled(sk) || | |
a4beb1b6 | 231 | dp->dccps_timestamp_echo != 0 || |
27258ee5 ACM |
232 | (dp->dccps_options.dccpo_send_ack_vector && |
233 | ap->dccpap_buf_ackno != DCCP_MAX_SEQNO + 1 && | |
234 | ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1)) | |
235 | dcb->dccpd_type = DCCP_PKT_DATAACK; | |
236 | else | |
237 | dcb->dccpd_type = DCCP_PKT_DATA; | |
238 | ||
239 | err = dccp_transmit_skb(sk, skb); | |
240 | ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len); | |
241 | } | |
242 | ||
243 | return err; | |
244 | } | |
245 | ||
7c657876 ACM |
246 | int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb) |
247 | { | |
248 | if (inet_sk_rebuild_header(sk) != 0) | |
249 | return -EHOSTUNREACH; /* Routing failure or similar. */ | |
250 | ||
251 | return dccp_transmit_skb(sk, (skb_cloned(skb) ? | |
252 | pskb_copy(skb, GFP_ATOMIC): | |
253 | skb_clone(skb, GFP_ATOMIC))); | |
254 | } | |
255 | ||
256 | struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, | |
257 | struct request_sock *req) | |
258 | { | |
259 | struct dccp_hdr *dh; | |
260 | const int dccp_header_size = sizeof(struct dccp_hdr) + | |
261 | sizeof(struct dccp_hdr_ext) + | |
262 | sizeof(struct dccp_hdr_response); | |
263 | struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN + | |
264 | dccp_header_size, 1, | |
265 | GFP_ATOMIC); | |
266 | if (skb == NULL) | |
267 | return NULL; | |
268 | ||
269 | /* Reserve space for headers. */ | |
270 | skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size); | |
271 | ||
272 | skb->dst = dst_clone(dst); | |
273 | skb->csum = 0; | |
274 | ||
275 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE; | |
276 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_rsk(req)->dreq_iss; | |
277 | dccp_insert_options(sk, skb); | |
278 | ||
279 | skb->h.raw = skb_push(skb, dccp_header_size); | |
280 | ||
281 | dh = dccp_hdr(skb); | |
282 | memset(dh, 0, dccp_header_size); | |
283 | ||
284 | dh->dccph_sport = inet_sk(sk)->sport; | |
285 | dh->dccph_dport = inet_rsk(req)->rmt_port; | |
7690af3f ACM |
286 | dh->dccph_doff = (dccp_header_size + |
287 | DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; | |
7c657876 ACM |
288 | dh->dccph_type = DCCP_PKT_RESPONSE; |
289 | dh->dccph_x = 1; | |
290 | dccp_hdr_set_seq(dh, dccp_rsk(req)->dreq_iss); | |
291 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dccp_rsk(req)->dreq_isr); | |
292 | ||
95b81ef7 YN |
293 | dh->dccph_checksum = dccp_v4_checksum(skb, inet_rsk(req)->loc_addr, |
294 | inet_rsk(req)->rmt_addr); | |
7c657876 ACM |
295 | |
296 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); | |
297 | return skb; | |
298 | } | |
299 | ||
300 | struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst, | |
301 | const enum dccp_reset_codes code) | |
302 | ||
303 | { | |
304 | struct dccp_hdr *dh; | |
305 | struct dccp_sock *dp = dccp_sk(sk); | |
306 | const int dccp_header_size = sizeof(struct dccp_hdr) + | |
307 | sizeof(struct dccp_hdr_ext) + | |
308 | sizeof(struct dccp_hdr_reset); | |
309 | struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN + | |
310 | dccp_header_size, 1, | |
311 | GFP_ATOMIC); | |
312 | if (skb == NULL) | |
313 | return NULL; | |
314 | ||
315 | /* Reserve space for headers. */ | |
316 | skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size); | |
317 | ||
318 | skb->dst = dst_clone(dst); | |
319 | skb->csum = 0; | |
320 | ||
321 | dccp_inc_seqno(&dp->dccps_gss); | |
322 | ||
323 | DCCP_SKB_CB(skb)->dccpd_reset_code = code; | |
324 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET; | |
325 | DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss; | |
326 | dccp_insert_options(sk, skb); | |
327 | ||
328 | skb->h.raw = skb_push(skb, dccp_header_size); | |
329 | ||
330 | dh = dccp_hdr(skb); | |
331 | memset(dh, 0, dccp_header_size); | |
332 | ||
333 | dh->dccph_sport = inet_sk(sk)->sport; | |
334 | dh->dccph_dport = inet_sk(sk)->dport; | |
7690af3f ACM |
335 | dh->dccph_doff = (dccp_header_size + |
336 | DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; | |
7c657876 ACM |
337 | dh->dccph_type = DCCP_PKT_RESET; |
338 | dh->dccph_x = 1; | |
339 | dccp_hdr_set_seq(dh, dp->dccps_gss); | |
340 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr); | |
341 | ||
342 | dccp_hdr_reset(skb)->dccph_reset_code = code; | |
343 | ||
95b81ef7 YN |
344 | dh->dccph_checksum = dccp_v4_checksum(skb, inet_sk(sk)->saddr, |
345 | inet_sk(sk)->daddr); | |
7c657876 ACM |
346 | |
347 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); | |
348 | return skb; | |
349 | } | |
350 | ||
351 | /* | |
352 | * Do all connect socket setups that can be done AF independent. | |
353 | */ | |
354 | static inline void dccp_connect_init(struct sock *sk) | |
355 | { | |
356 | struct dst_entry *dst = __sk_dst_get(sk); | |
357 | struct inet_connection_sock *icsk = inet_csk(sk); | |
358 | ||
359 | sk->sk_err = 0; | |
360 | sock_reset_flag(sk, SOCK_DONE); | |
361 | ||
362 | dccp_sync_mss(sk, dst_mtu(dst)); | |
363 | ||
364 | /* | |
365 | * FIXME: set dp->{dccps_swh,dccps_swl}, with | |
366 | * something like dccp_inc_seq | |
367 | */ | |
368 | ||
369 | icsk->icsk_retransmits = 0; | |
370 | } | |
371 | ||
372 | int dccp_connect(struct sock *sk) | |
373 | { | |
374 | struct sk_buff *skb; | |
375 | struct inet_connection_sock *icsk = inet_csk(sk); | |
376 | ||
377 | dccp_connect_init(sk); | |
378 | ||
379 | skb = alloc_skb(MAX_DCCP_HEADER + 15, sk->sk_allocation); | |
380 | if (unlikely(skb == NULL)) | |
381 | return -ENOBUFS; | |
382 | ||
383 | /* Reserve space for headers. */ | |
384 | skb_reserve(skb, MAX_DCCP_HEADER); | |
385 | ||
386 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST; | |
387 | /* FIXME: set service to something meaningful, coming | |
388 | * from userspace*/ | |
389 | DCCP_SKB_CB(skb)->dccpd_service = 0; | |
390 | skb->csum = 0; | |
391 | skb_set_owner_w(skb, sk); | |
392 | ||
393 | BUG_TRAP(sk->sk_send_head == NULL); | |
394 | sk->sk_send_head = skb; | |
395 | dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL)); | |
396 | DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS); | |
397 | ||
398 | /* Timer for repeating the REQUEST until an answer. */ | |
27258ee5 ACM |
399 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
400 | icsk->icsk_rto, DCCP_RTO_MAX); | |
7c657876 ACM |
401 | return 0; |
402 | } | |
403 | ||
404 | void dccp_send_ack(struct sock *sk) | |
405 | { | |
406 | /* If we have been reset, we may not send again. */ | |
407 | if (sk->sk_state != DCCP_CLOSED) { | |
408 | struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC); | |
409 | ||
410 | if (skb == NULL) { | |
411 | inet_csk_schedule_ack(sk); | |
412 | inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN; | |
7690af3f ACM |
413 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
414 | TCP_DELACK_MAX, | |
415 | DCCP_RTO_MAX); | |
7c657876 ACM |
416 | return; |
417 | } | |
418 | ||
419 | /* Reserve space for headers */ | |
420 | skb_reserve(skb, MAX_DCCP_HEADER); | |
421 | skb->csum = 0; | |
422 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK; | |
423 | skb_set_owner_w(skb, sk); | |
424 | dccp_transmit_skb(sk, skb); | |
425 | } | |
426 | } | |
427 | ||
428 | EXPORT_SYMBOL_GPL(dccp_send_ack); | |
429 | ||
430 | void dccp_send_delayed_ack(struct sock *sk) | |
431 | { | |
432 | struct inet_connection_sock *icsk = inet_csk(sk); | |
433 | /* | |
434 | * FIXME: tune this timer. elapsed time fixes the skew, so no problem | |
435 | * with using 2s, and active senders also piggyback the ACK into a | |
436 | * DATAACK packet, so this is really for quiescent senders. | |
437 | */ | |
438 | unsigned long timeout = jiffies + 2 * HZ; | |
439 | ||
440 | /* Use new timeout only if there wasn't a older one earlier. */ | |
441 | if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) { | |
442 | /* If delack timer was blocked or is about to expire, | |
443 | * send ACK now. | |
444 | * | |
445 | * FIXME: check the "about to expire" part | |
446 | */ | |
447 | if (icsk->icsk_ack.blocked) { | |
448 | dccp_send_ack(sk); | |
449 | return; | |
450 | } | |
451 | ||
452 | if (!time_before(timeout, icsk->icsk_ack.timeout)) | |
453 | timeout = icsk->icsk_ack.timeout; | |
454 | } | |
455 | icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; | |
456 | icsk->icsk_ack.timeout = timeout; | |
457 | sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); | |
458 | } | |
459 | ||
e92ae93a ACM |
460 | void dccp_send_sync(struct sock *sk, const u64 seq, |
461 | const enum dccp_pkt_type pkt_type) | |
7c657876 ACM |
462 | { |
463 | /* | |
464 | * We are not putting this on the write queue, so | |
465 | * dccp_transmit_skb() will set the ownership to this | |
466 | * sock. | |
467 | */ | |
468 | struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC); | |
469 | ||
470 | if (skb == NULL) | |
471 | /* FIXME: how to make sure the sync is sent? */ | |
472 | return; | |
473 | ||
474 | /* Reserve space for headers and prepare control bits. */ | |
475 | skb_reserve(skb, MAX_DCCP_HEADER); | |
476 | skb->csum = 0; | |
e92ae93a | 477 | DCCP_SKB_CB(skb)->dccpd_type = pkt_type; |
7c657876 ACM |
478 | DCCP_SKB_CB(skb)->dccpd_seq = seq; |
479 | ||
480 | skb_set_owner_w(skb, sk); | |
481 | dccp_transmit_skb(sk, skb); | |
482 | } | |
483 | ||
7690af3f ACM |
484 | /* |
485 | * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This | |
486 | * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under | |
487 | * any circumstances. | |
7c657876 | 488 | */ |
7ad07e7c | 489 | void dccp_send_close(struct sock *sk, const int active) |
7c657876 ACM |
490 | { |
491 | struct dccp_sock *dp = dccp_sk(sk); | |
492 | struct sk_buff *skb; | |
7ad07e7c | 493 | const unsigned int prio = active ? GFP_KERNEL : GFP_ATOMIC; |
7c657876 | 494 | |
7ad07e7c ACM |
495 | skb = alloc_skb(sk->sk_prot->max_header, prio); |
496 | if (skb == NULL) | |
497 | return; | |
7c657876 ACM |
498 | |
499 | /* Reserve space for headers and prepare control bits. */ | |
500 | skb_reserve(skb, sk->sk_prot->max_header); | |
501 | skb->csum = 0; | |
7690af3f ACM |
502 | DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ? |
503 | DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ; | |
7c657876 ACM |
504 | |
505 | skb_set_owner_w(skb, sk); | |
7ad07e7c ACM |
506 | if (active) { |
507 | BUG_TRAP(sk->sk_send_head == NULL); | |
508 | sk->sk_send_head = skb; | |
509 | dccp_transmit_skb(sk, skb_clone(skb, prio)); | |
510 | } else | |
511 | dccp_transmit_skb(sk, skb); | |
7c657876 ACM |
512 | |
513 | ccid_hc_rx_exit(dp->dccps_hc_rx_ccid, sk); | |
514 | ccid_hc_tx_exit(dp->dccps_hc_tx_ccid, sk); | |
515 | } |