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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> | |
48918a4d | 15 | #include <linux/kernel.h> |
7c657876 ACM |
16 | #include <linux/skbuff.h> |
17 | ||
14c85021 | 18 | #include <net/inet_sock.h> |
7c657876 ACM |
19 | #include <net/sock.h> |
20 | ||
ae31c339 | 21 | #include "ackvec.h" |
7c657876 ACM |
22 | #include "ccid.h" |
23 | #include "dccp.h" | |
24 | ||
25 | static inline void dccp_event_ack_sent(struct sock *sk) | |
26 | { | |
27 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); | |
28 | } | |
29 | ||
48918a4d HX |
30 | static inline void dccp_skb_entail(struct sock *sk, struct sk_buff *skb) |
31 | { | |
32 | skb_set_owner_w(skb, sk); | |
33 | WARN_ON(sk->sk_send_head); | |
34 | sk->sk_send_head = skb; | |
35 | } | |
36 | ||
7c657876 ACM |
37 | /* |
38 | * All SKB's seen here are completely headerless. It is our | |
39 | * job to build the DCCP header, and pass the packet down to | |
40 | * IP so it can do the same plus pass the packet off to the | |
41 | * device. | |
42 | */ | |
48918a4d | 43 | static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb) |
7c657876 ACM |
44 | { |
45 | if (likely(skb != NULL)) { | |
46 | const struct inet_sock *inet = inet_sk(sk); | |
57cca05a | 47 | const struct inet_connection_sock *icsk = inet_csk(sk); |
7c657876 ACM |
48 | struct dccp_sock *dp = dccp_sk(sk); |
49 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); | |
50 | struct dccp_hdr *dh; | |
51 | /* XXX For now we're using only 48 bits sequence numbers */ | |
52 | const int dccp_header_size = sizeof(*dh) + | |
53 | sizeof(struct dccp_hdr_ext) + | |
7690af3f | 54 | dccp_packet_hdr_len(dcb->dccpd_type); |
7c657876 ACM |
55 | int err, set_ack = 1; |
56 | u64 ackno = dp->dccps_gsr; | |
57 | ||
7c657876 ACM |
58 | dccp_inc_seqno(&dp->dccps_gss); |
59 | ||
7c657876 ACM |
60 | switch (dcb->dccpd_type) { |
61 | case DCCP_PKT_DATA: | |
62 | set_ack = 0; | |
edc9e819 HX |
63 | /* fall through */ |
64 | case DCCP_PKT_DATAACK: | |
7c657876 | 65 | break; |
edc9e819 | 66 | |
7c657876 ACM |
67 | case DCCP_PKT_SYNC: |
68 | case DCCP_PKT_SYNCACK: | |
69 | ackno = dcb->dccpd_seq; | |
edc9e819 HX |
70 | /* fall through */ |
71 | default: | |
72 | /* | |
73 | * Only data packets should come through with skb->sk | |
74 | * set. | |
75 | */ | |
76 | WARN_ON(skb->sk); | |
77 | skb_set_owner_w(skb, sk); | |
7c657876 ACM |
78 | break; |
79 | } | |
24117727 ACM |
80 | |
81 | dcb->dccpd_seq = dp->dccps_gss; | |
82 | dccp_insert_options(sk, skb); | |
7c657876 ACM |
83 | |
84 | skb->h.raw = skb_push(skb, dccp_header_size); | |
85 | dh = dccp_hdr(skb); | |
fda0fd6c | 86 | |
7c657876 ACM |
87 | /* Build DCCP header and checksum it. */ |
88 | memset(dh, 0, dccp_header_size); | |
89 | dh->dccph_type = dcb->dccpd_type; | |
90 | dh->dccph_sport = inet->sport; | |
91 | dh->dccph_dport = inet->dport; | |
92 | dh->dccph_doff = (dccp_header_size + dcb->dccpd_opt_len) / 4; | |
93 | dh->dccph_ccval = dcb->dccpd_ccval; | |
94 | /* XXX For now we're using only 48 bits sequence numbers */ | |
95 | dh->dccph_x = 1; | |
96 | ||
97 | dp->dccps_awh = dp->dccps_gss; | |
98 | dccp_hdr_set_seq(dh, dp->dccps_gss); | |
99 | if (set_ack) | |
100 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), ackno); | |
101 | ||
102 | switch (dcb->dccpd_type) { | |
103 | case DCCP_PKT_REQUEST: | |
7690af3f | 104 | dccp_hdr_request(skb)->dccph_req_service = |
67e6b629 | 105 | dp->dccps_service; |
7c657876 ACM |
106 | break; |
107 | case DCCP_PKT_RESET: | |
7690af3f ACM |
108 | dccp_hdr_reset(skb)->dccph_reset_code = |
109 | dcb->dccpd_reset_code; | |
7c657876 ACM |
110 | break; |
111 | } | |
112 | ||
57cca05a | 113 | icsk->icsk_af_ops->send_check(sk, skb->len, skb); |
7c657876 | 114 | |
7ad07e7c | 115 | if (set_ack) |
7c657876 ACM |
116 | dccp_event_ack_sent(sk); |
117 | ||
118 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); | |
119 | ||
49c5bfaf | 120 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
57cca05a | 121 | err = icsk->icsk_af_ops->queue_xmit(skb, 0); |
7c657876 ACM |
122 | if (err <= 0) |
123 | return err; | |
124 | ||
125 | /* NET_XMIT_CN is special. It does not guarantee, | |
126 | * that this packet is lost. It tells that device | |
127 | * is about to start to drop packets or already | |
128 | * drops some packets of the same priority and | |
129 | * invokes us to send less aggressively. | |
130 | */ | |
131 | return err == NET_XMIT_CN ? 0 : err; | |
132 | } | |
133 | return -ENOBUFS; | |
134 | } | |
135 | ||
136 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu) | |
137 | { | |
d83d8461 | 138 | struct inet_connection_sock *icsk = inet_csk(sk); |
7c657876 | 139 | struct dccp_sock *dp = dccp_sk(sk); |
d83d8461 | 140 | int mss_now = (pmtu - icsk->icsk_af_ops->net_header_len - |
57cca05a | 141 | sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext)); |
7c657876 ACM |
142 | |
143 | /* Now subtract optional transport overhead */ | |
d83d8461 | 144 | mss_now -= icsk->icsk_ext_hdr_len; |
7c657876 ACM |
145 | |
146 | /* | |
147 | * FIXME: this should come from the CCID infrastructure, where, say, | |
148 | * TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets | |
149 | * put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED | |
150 | * TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to | |
151 | * make it a multiple of 4 | |
152 | */ | |
153 | ||
154 | mss_now -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4; | |
155 | ||
156 | /* And store cached results */ | |
d83d8461 | 157 | icsk->icsk_pmtu_cookie = pmtu; |
7c657876 ACM |
158 | dp->dccps_mss_cache = mss_now; |
159 | ||
160 | return mss_now; | |
161 | } | |
162 | ||
f21e68ca ACM |
163 | EXPORT_SYMBOL_GPL(dccp_sync_mss); |
164 | ||
c530cfb1 ACM |
165 | void dccp_write_space(struct sock *sk) |
166 | { | |
167 | read_lock(&sk->sk_callback_lock); | |
168 | ||
169 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
170 | wake_up_interruptible(sk->sk_sleep); | |
171 | /* Should agree with poll, otherwise some programs break */ | |
172 | if (sock_writeable(sk)) | |
173 | sk_wake_async(sk, 2, POLL_OUT); | |
174 | ||
175 | read_unlock(&sk->sk_callback_lock); | |
176 | } | |
177 | ||
d6809c12 ACM |
178 | /** |
179 | * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet | |
180 | * @sk: socket to wait for | |
181 | * @timeo: for how long | |
182 | */ | |
183 | static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb, | |
184 | long *timeo) | |
185 | { | |
186 | struct dccp_sock *dp = dccp_sk(sk); | |
187 | DEFINE_WAIT(wait); | |
188 | long delay; | |
189 | int rc; | |
190 | ||
191 | while (1) { | |
192 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
193 | ||
194 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
195 | goto do_error; | |
196 | if (!*timeo) | |
197 | goto do_nonblock; | |
198 | if (signal_pending(current)) | |
199 | goto do_interrupted; | |
200 | ||
201 | rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, | |
202 | skb->len); | |
203 | if (rc <= 0) | |
204 | break; | |
205 | delay = msecs_to_jiffies(rc); | |
206 | if (delay > *timeo || delay < 0) | |
207 | goto do_nonblock; | |
208 | ||
209 | sk->sk_write_pending++; | |
210 | release_sock(sk); | |
211 | *timeo -= schedule_timeout(delay); | |
212 | lock_sock(sk); | |
213 | sk->sk_write_pending--; | |
214 | } | |
215 | out: | |
216 | finish_wait(sk->sk_sleep, &wait); | |
217 | return rc; | |
218 | ||
219 | do_error: | |
220 | rc = -EPIPE; | |
221 | goto out; | |
222 | do_nonblock: | |
223 | rc = -EAGAIN; | |
224 | goto out; | |
225 | do_interrupted: | |
226 | rc = sock_intr_errno(*timeo); | |
227 | goto out; | |
228 | } | |
229 | ||
230 | int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo) | |
27258ee5 ACM |
231 | { |
232 | const struct dccp_sock *dp = dccp_sk(sk); | |
d6809c12 ACM |
233 | int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, |
234 | skb->len); | |
235 | ||
236 | if (err > 0) | |
237 | err = dccp_wait_for_ccid(sk, skb, timeo); | |
27258ee5 ACM |
238 | |
239 | if (err == 0) { | |
27258ee5 | 240 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
d6809c12 | 241 | const int len = skb->len; |
27258ee5 ACM |
242 | |
243 | if (sk->sk_state == DCCP_PARTOPEN) { | |
244 | /* See 8.1.5. Handshake Completion */ | |
245 | inet_csk_schedule_ack(sk); | |
246 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, | |
247 | inet_csk(sk)->icsk_rto, | |
248 | DCCP_RTO_MAX); | |
249 | dcb->dccpd_type = DCCP_PKT_DATAACK; | |
ae31c339 | 250 | } else if (dccp_ack_pending(sk)) |
27258ee5 ACM |
251 | dcb->dccpd_type = DCCP_PKT_DATAACK; |
252 | else | |
253 | dcb->dccpd_type = DCCP_PKT_DATA; | |
254 | ||
255 | err = dccp_transmit_skb(sk, skb); | |
256 | ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len); | |
ffa29347 HX |
257 | } else |
258 | kfree_skb(skb); | |
27258ee5 ACM |
259 | |
260 | return err; | |
261 | } | |
262 | ||
7c657876 ACM |
263 | int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb) |
264 | { | |
57cca05a | 265 | if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk) != 0) |
7c657876 ACM |
266 | return -EHOSTUNREACH; /* Routing failure or similar. */ |
267 | ||
268 | return dccp_transmit_skb(sk, (skb_cloned(skb) ? | |
269 | pskb_copy(skb, GFP_ATOMIC): | |
270 | skb_clone(skb, GFP_ATOMIC))); | |
271 | } | |
272 | ||
273 | struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, | |
274 | struct request_sock *req) | |
275 | { | |
276 | struct dccp_hdr *dh; | |
67e6b629 | 277 | struct dccp_request_sock *dreq; |
7c657876 ACM |
278 | const int dccp_header_size = sizeof(struct dccp_hdr) + |
279 | sizeof(struct dccp_hdr_ext) + | |
280 | sizeof(struct dccp_hdr_response); | |
281 | struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN + | |
282 | dccp_header_size, 1, | |
283 | GFP_ATOMIC); | |
284 | if (skb == NULL) | |
285 | return NULL; | |
286 | ||
287 | /* Reserve space for headers. */ | |
288 | skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size); | |
289 | ||
290 | skb->dst = dst_clone(dst); | |
291 | skb->csum = 0; | |
292 | ||
67e6b629 | 293 | dreq = dccp_rsk(req); |
7c657876 | 294 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE; |
67e6b629 | 295 | DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss; |
7c657876 ACM |
296 | dccp_insert_options(sk, skb); |
297 | ||
298 | skb->h.raw = skb_push(skb, dccp_header_size); | |
299 | ||
300 | dh = dccp_hdr(skb); | |
301 | memset(dh, 0, dccp_header_size); | |
302 | ||
303 | dh->dccph_sport = inet_sk(sk)->sport; | |
304 | dh->dccph_dport = inet_rsk(req)->rmt_port; | |
7690af3f ACM |
305 | dh->dccph_doff = (dccp_header_size + |
306 | DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; | |
7c657876 ACM |
307 | dh->dccph_type = DCCP_PKT_RESPONSE; |
308 | dh->dccph_x = 1; | |
67e6b629 ACM |
309 | dccp_hdr_set_seq(dh, dreq->dreq_iss); |
310 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr); | |
311 | dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service; | |
7c657876 | 312 | |
95b81ef7 YN |
313 | dh->dccph_checksum = dccp_v4_checksum(skb, inet_rsk(req)->loc_addr, |
314 | inet_rsk(req)->rmt_addr); | |
7c657876 ACM |
315 | |
316 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); | |
317 | return skb; | |
318 | } | |
319 | ||
f21e68ca ACM |
320 | EXPORT_SYMBOL_GPL(dccp_make_response); |
321 | ||
7c657876 ACM |
322 | struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst, |
323 | const enum dccp_reset_codes code) | |
324 | ||
325 | { | |
326 | struct dccp_hdr *dh; | |
327 | struct dccp_sock *dp = dccp_sk(sk); | |
328 | const int dccp_header_size = sizeof(struct dccp_hdr) + | |
329 | sizeof(struct dccp_hdr_ext) + | |
330 | sizeof(struct dccp_hdr_reset); | |
331 | struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN + | |
332 | dccp_header_size, 1, | |
333 | GFP_ATOMIC); | |
334 | if (skb == NULL) | |
335 | return NULL; | |
336 | ||
337 | /* Reserve space for headers. */ | |
338 | skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size); | |
339 | ||
340 | skb->dst = dst_clone(dst); | |
341 | skb->csum = 0; | |
342 | ||
343 | dccp_inc_seqno(&dp->dccps_gss); | |
344 | ||
345 | DCCP_SKB_CB(skb)->dccpd_reset_code = code; | |
346 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET; | |
347 | DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss; | |
348 | dccp_insert_options(sk, skb); | |
349 | ||
350 | skb->h.raw = skb_push(skb, dccp_header_size); | |
351 | ||
352 | dh = dccp_hdr(skb); | |
353 | memset(dh, 0, dccp_header_size); | |
354 | ||
355 | dh->dccph_sport = inet_sk(sk)->sport; | |
356 | dh->dccph_dport = inet_sk(sk)->dport; | |
7690af3f ACM |
357 | dh->dccph_doff = (dccp_header_size + |
358 | DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; | |
7c657876 ACM |
359 | dh->dccph_type = DCCP_PKT_RESET; |
360 | dh->dccph_x = 1; | |
361 | dccp_hdr_set_seq(dh, dp->dccps_gss); | |
362 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr); | |
363 | ||
364 | dccp_hdr_reset(skb)->dccph_reset_code = code; | |
365 | ||
95b81ef7 YN |
366 | dh->dccph_checksum = dccp_v4_checksum(skb, inet_sk(sk)->saddr, |
367 | inet_sk(sk)->daddr); | |
7c657876 ACM |
368 | |
369 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); | |
370 | return skb; | |
371 | } | |
372 | ||
373 | /* | |
374 | * Do all connect socket setups that can be done AF independent. | |
375 | */ | |
376 | static inline void dccp_connect_init(struct sock *sk) | |
377 | { | |
f21e68ca | 378 | struct dccp_sock *dp = dccp_sk(sk); |
7c657876 ACM |
379 | struct dst_entry *dst = __sk_dst_get(sk); |
380 | struct inet_connection_sock *icsk = inet_csk(sk); | |
381 | ||
382 | sk->sk_err = 0; | |
383 | sock_reset_flag(sk, SOCK_DONE); | |
384 | ||
385 | dccp_sync_mss(sk, dst_mtu(dst)); | |
386 | ||
f21e68ca ACM |
387 | dccp_update_gss(sk, dp->dccps_iss); |
388 | /* | |
389 | * SWL and AWL are initially adjusted so that they are not less than | |
390 | * the initial Sequence Numbers received and sent, respectively: | |
391 | * SWL := max(GSR + 1 - floor(W/4), ISR), | |
392 | * AWL := max(GSS - W' + 1, ISS). | |
393 | * These adjustments MUST be applied only at the beginning of the | |
394 | * connection. | |
395 | */ | |
396 | dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss)); | |
7c657876 ACM |
397 | |
398 | icsk->icsk_retransmits = 0; | |
399 | } | |
400 | ||
401 | int dccp_connect(struct sock *sk) | |
402 | { | |
403 | struct sk_buff *skb; | |
404 | struct inet_connection_sock *icsk = inet_csk(sk); | |
405 | ||
406 | dccp_connect_init(sk); | |
407 | ||
408 | skb = alloc_skb(MAX_DCCP_HEADER + 15, sk->sk_allocation); | |
409 | if (unlikely(skb == NULL)) | |
410 | return -ENOBUFS; | |
411 | ||
412 | /* Reserve space for headers. */ | |
413 | skb_reserve(skb, MAX_DCCP_HEADER); | |
414 | ||
415 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST; | |
7c657876 | 416 | skb->csum = 0; |
7c657876 | 417 | |
48918a4d | 418 | dccp_skb_entail(sk, skb); |
7c657876 ACM |
419 | dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL)); |
420 | DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS); | |
421 | ||
422 | /* Timer for repeating the REQUEST until an answer. */ | |
27258ee5 ACM |
423 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
424 | icsk->icsk_rto, DCCP_RTO_MAX); | |
7c657876 ACM |
425 | return 0; |
426 | } | |
427 | ||
f21e68ca ACM |
428 | EXPORT_SYMBOL_GPL(dccp_connect); |
429 | ||
7c657876 ACM |
430 | void dccp_send_ack(struct sock *sk) |
431 | { | |
432 | /* If we have been reset, we may not send again. */ | |
433 | if (sk->sk_state != DCCP_CLOSED) { | |
434 | struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC); | |
435 | ||
436 | if (skb == NULL) { | |
437 | inet_csk_schedule_ack(sk); | |
438 | inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN; | |
7690af3f ACM |
439 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
440 | TCP_DELACK_MAX, | |
441 | DCCP_RTO_MAX); | |
7c657876 ACM |
442 | return; |
443 | } | |
444 | ||
445 | /* Reserve space for headers */ | |
446 | skb_reserve(skb, MAX_DCCP_HEADER); | |
447 | skb->csum = 0; | |
448 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK; | |
7c657876 ACM |
449 | dccp_transmit_skb(sk, skb); |
450 | } | |
451 | } | |
452 | ||
453 | EXPORT_SYMBOL_GPL(dccp_send_ack); | |
454 | ||
455 | void dccp_send_delayed_ack(struct sock *sk) | |
456 | { | |
457 | struct inet_connection_sock *icsk = inet_csk(sk); | |
458 | /* | |
459 | * FIXME: tune this timer. elapsed time fixes the skew, so no problem | |
460 | * with using 2s, and active senders also piggyback the ACK into a | |
461 | * DATAACK packet, so this is really for quiescent senders. | |
462 | */ | |
463 | unsigned long timeout = jiffies + 2 * HZ; | |
464 | ||
465 | /* Use new timeout only if there wasn't a older one earlier. */ | |
466 | if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) { | |
467 | /* If delack timer was blocked or is about to expire, | |
468 | * send ACK now. | |
469 | * | |
470 | * FIXME: check the "about to expire" part | |
471 | */ | |
472 | if (icsk->icsk_ack.blocked) { | |
473 | dccp_send_ack(sk); | |
474 | return; | |
475 | } | |
476 | ||
477 | if (!time_before(timeout, icsk->icsk_ack.timeout)) | |
478 | timeout = icsk->icsk_ack.timeout; | |
479 | } | |
480 | icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; | |
481 | icsk->icsk_ack.timeout = timeout; | |
482 | sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); | |
483 | } | |
484 | ||
e92ae93a ACM |
485 | void dccp_send_sync(struct sock *sk, const u64 seq, |
486 | const enum dccp_pkt_type pkt_type) | |
7c657876 ACM |
487 | { |
488 | /* | |
489 | * We are not putting this on the write queue, so | |
490 | * dccp_transmit_skb() will set the ownership to this | |
491 | * sock. | |
492 | */ | |
493 | struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC); | |
494 | ||
495 | if (skb == NULL) | |
496 | /* FIXME: how to make sure the sync is sent? */ | |
497 | return; | |
498 | ||
499 | /* Reserve space for headers and prepare control bits. */ | |
500 | skb_reserve(skb, MAX_DCCP_HEADER); | |
501 | skb->csum = 0; | |
e92ae93a | 502 | DCCP_SKB_CB(skb)->dccpd_type = pkt_type; |
7c657876 ACM |
503 | DCCP_SKB_CB(skb)->dccpd_seq = seq; |
504 | ||
7c657876 ACM |
505 | dccp_transmit_skb(sk, skb); |
506 | } | |
507 | ||
7690af3f ACM |
508 | /* |
509 | * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This | |
510 | * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under | |
511 | * any circumstances. | |
7c657876 | 512 | */ |
7ad07e7c | 513 | void dccp_send_close(struct sock *sk, const int active) |
7c657876 ACM |
514 | { |
515 | struct dccp_sock *dp = dccp_sk(sk); | |
516 | struct sk_buff *skb; | |
7d877f3b | 517 | const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC; |
7c657876 | 518 | |
7ad07e7c ACM |
519 | skb = alloc_skb(sk->sk_prot->max_header, prio); |
520 | if (skb == NULL) | |
521 | return; | |
7c657876 ACM |
522 | |
523 | /* Reserve space for headers and prepare control bits. */ | |
524 | skb_reserve(skb, sk->sk_prot->max_header); | |
525 | skb->csum = 0; | |
7690af3f ACM |
526 | DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ? |
527 | DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ; | |
7c657876 | 528 | |
7ad07e7c | 529 | if (active) { |
48918a4d | 530 | dccp_skb_entail(sk, skb); |
7ad07e7c ACM |
531 | dccp_transmit_skb(sk, skb_clone(skb, prio)); |
532 | } else | |
533 | dccp_transmit_skb(sk, skb); | |
7c657876 | 534 | } |