2005-08-09 21:14:34 -06:00
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/*
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* net/dccp/output.c
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/dccp.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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2005-09-18 01:17:51 -06:00
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#include "ackvec.h"
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2005-08-09 21:14:34 -06:00
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#include "ccid.h"
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#include "dccp.h"
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static inline void dccp_event_ack_sent(struct sock *sk)
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{
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inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
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}
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/*
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* All SKB's seen here are completely headerless. It is our
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* job to build the DCCP header, and pass the packet down to
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* IP so it can do the same plus pass the packet off to the
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* device.
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*/
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int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
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{
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if (likely(skb != NULL)) {
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const struct inet_sock *inet = inet_sk(sk);
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struct dccp_sock *dp = dccp_sk(sk);
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struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
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struct dccp_hdr *dh;
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/* XXX For now we're using only 48 bits sequence numbers */
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const int dccp_header_size = sizeof(*dh) +
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sizeof(struct dccp_hdr_ext) +
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2005-08-13 17:34:54 -06:00
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dccp_packet_hdr_len(dcb->dccpd_type);
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2005-08-09 21:14:34 -06:00
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int err, set_ack = 1;
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u64 ackno = dp->dccps_gsr;
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dccp_inc_seqno(&dp->dccps_gss);
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switch (dcb->dccpd_type) {
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case DCCP_PKT_DATA:
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set_ack = 0;
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break;
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case DCCP_PKT_SYNC:
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case DCCP_PKT_SYNCACK:
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ackno = dcb->dccpd_seq;
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break;
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}
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2005-08-21 02:40:16 -06:00
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dcb->dccpd_seq = dp->dccps_gss;
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dccp_insert_options(sk, skb);
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2005-08-09 21:14:34 -06:00
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skb->h.raw = skb_push(skb, dccp_header_size);
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dh = dccp_hdr(skb);
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2005-10-14 00:38:49 -06:00
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if (!skb->sk)
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2005-08-09 21:14:34 -06:00
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skb_set_owner_w(skb, sk);
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/* Build DCCP header and checksum it. */
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memset(dh, 0, dccp_header_size);
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dh->dccph_type = dcb->dccpd_type;
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dh->dccph_sport = inet->sport;
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dh->dccph_dport = inet->dport;
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dh->dccph_doff = (dccp_header_size + dcb->dccpd_opt_len) / 4;
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dh->dccph_ccval = dcb->dccpd_ccval;
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/* XXX For now we're using only 48 bits sequence numbers */
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dh->dccph_x = 1;
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dp->dccps_awh = dp->dccps_gss;
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dccp_hdr_set_seq(dh, dp->dccps_gss);
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if (set_ack)
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dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), ackno);
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switch (dcb->dccpd_type) {
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case DCCP_PKT_REQUEST:
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2005-08-13 17:34:54 -06:00
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dccp_hdr_request(skb)->dccph_req_service =
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2005-09-16 17:58:40 -06:00
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dp->dccps_service;
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2005-08-09 21:14:34 -06:00
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break;
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case DCCP_PKT_RESET:
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2005-08-13 17:34:54 -06:00
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dccp_hdr_reset(skb)->dccph_reset_code =
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dcb->dccpd_reset_code;
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2005-08-09 21:14:34 -06:00
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break;
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}
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2005-08-09 21:15:35 -06:00
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dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr,
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inet->daddr);
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2005-08-09 21:14:34 -06:00
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2005-08-23 22:50:06 -06:00
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if (set_ack)
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2005-08-09 21:14:34 -06:00
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dccp_event_ack_sent(sk);
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DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
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err = ip_queue_xmit(skb, 0);
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if (err <= 0)
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return err;
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/* NET_XMIT_CN is special. It does not guarantee,
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* that this packet is lost. It tells that device
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* is about to start to drop packets or already
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* drops some packets of the same priority and
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* invokes us to send less aggressively.
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*/
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return err == NET_XMIT_CN ? 0 : err;
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}
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return -ENOBUFS;
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}
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unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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int mss_now;
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/*
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2005-08-13 17:34:54 -06:00
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* FIXME: we really should be using the af_specific thing to support
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* IPv6.
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* mss_now = pmtu - tp->af_specific->net_header_len -
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* sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);
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2005-08-09 21:14:34 -06:00
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*/
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2005-08-13 17:34:54 -06:00
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mss_now = pmtu - sizeof(struct iphdr) - sizeof(struct dccp_hdr) -
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sizeof(struct dccp_hdr_ext);
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2005-08-09 21:14:34 -06:00
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/* Now subtract optional transport overhead */
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mss_now -= dp->dccps_ext_header_len;
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/*
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* FIXME: this should come from the CCID infrastructure, where, say,
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* TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets
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* put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED
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* TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to
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* make it a multiple of 4
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*/
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mss_now -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4;
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/* And store cached results */
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dp->dccps_pmtu_cookie = pmtu;
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dp->dccps_mss_cache = mss_now;
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return mss_now;
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}
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2005-08-28 23:15:54 -06:00
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void dccp_write_space(struct sock *sk)
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{
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read_lock(&sk->sk_callback_lock);
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if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
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wake_up_interruptible(sk->sk_sleep);
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/* Should agree with poll, otherwise some programs break */
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if (sock_writeable(sk))
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sk_wake_async(sk, 2, POLL_OUT);
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read_unlock(&sk->sk_callback_lock);
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}
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2005-08-27 00:06:35 -06:00
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/**
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* dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
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* @sk: socket to wait for
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* @timeo: for how long
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*/
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static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb,
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long *timeo)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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DEFINE_WAIT(wait);
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long delay;
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int rc;
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while (1) {
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prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
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if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
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goto do_error;
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if (!*timeo)
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goto do_nonblock;
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if (signal_pending(current))
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goto do_interrupted;
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rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
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skb->len);
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if (rc <= 0)
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break;
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delay = msecs_to_jiffies(rc);
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if (delay > *timeo || delay < 0)
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goto do_nonblock;
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sk->sk_write_pending++;
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release_sock(sk);
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*timeo -= schedule_timeout(delay);
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lock_sock(sk);
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sk->sk_write_pending--;
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}
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out:
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finish_wait(sk->sk_sleep, &wait);
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return rc;
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do_error:
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rc = -EPIPE;
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goto out;
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do_nonblock:
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rc = -EAGAIN;
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goto out;
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do_interrupted:
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rc = sock_intr_errno(*timeo);
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goto out;
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}
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int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo)
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2005-08-09 21:30:56 -06:00
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{
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const struct dccp_sock *dp = dccp_sk(sk);
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2005-08-27 00:06:35 -06:00
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int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
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skb->len);
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if (err > 0)
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err = dccp_wait_for_ccid(sk, skb, timeo);
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2005-08-09 21:30:56 -06:00
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if (err == 0) {
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struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
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2005-08-27 00:06:35 -06:00
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const int len = skb->len;
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2005-08-09 21:30:56 -06:00
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if (sk->sk_state == DCCP_PARTOPEN) {
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/* See 8.1.5. Handshake Completion */
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inet_csk_schedule_ack(sk);
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inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
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inet_csk(sk)->icsk_rto,
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DCCP_RTO_MAX);
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dcb->dccpd_type = DCCP_PKT_DATAACK;
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2005-09-18 01:17:51 -06:00
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} else if (dccp_ack_pending(sk))
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2005-08-09 21:30:56 -06:00
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dcb->dccpd_type = DCCP_PKT_DATAACK;
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else
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dcb->dccpd_type = DCCP_PKT_DATA;
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err = dccp_transmit_skb(sk, skb);
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ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
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}
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return err;
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}
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2005-08-09 21:14:34 -06:00
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int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
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{
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if (inet_sk_rebuild_header(sk) != 0)
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return -EHOSTUNREACH; /* Routing failure or similar. */
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return dccp_transmit_skb(sk, (skb_cloned(skb) ?
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pskb_copy(skb, GFP_ATOMIC):
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skb_clone(skb, GFP_ATOMIC)));
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}
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struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
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struct request_sock *req)
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{
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struct dccp_hdr *dh;
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2005-09-16 17:58:40 -06:00
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struct dccp_request_sock *dreq;
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2005-08-09 21:14:34 -06:00
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const int dccp_header_size = sizeof(struct dccp_hdr) +
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sizeof(struct dccp_hdr_ext) +
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sizeof(struct dccp_hdr_response);
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struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
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dccp_header_size, 1,
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GFP_ATOMIC);
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if (skb == NULL)
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return NULL;
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/* Reserve space for headers. */
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skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
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skb->dst = dst_clone(dst);
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skb->csum = 0;
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2005-09-16 17:58:40 -06:00
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dreq = dccp_rsk(req);
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2005-08-09 21:14:34 -06:00
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DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
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2005-09-16 17:58:40 -06:00
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DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss;
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2005-08-09 21:14:34 -06:00
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dccp_insert_options(sk, skb);
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skb->h.raw = skb_push(skb, dccp_header_size);
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dh = dccp_hdr(skb);
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memset(dh, 0, dccp_header_size);
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dh->dccph_sport = inet_sk(sk)->sport;
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dh->dccph_dport = inet_rsk(req)->rmt_port;
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2005-08-13 17:34:54 -06:00
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dh->dccph_doff = (dccp_header_size +
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DCCP_SKB_CB(skb)->dccpd_opt_len) / 4;
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2005-08-09 21:14:34 -06:00
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dh->dccph_type = DCCP_PKT_RESPONSE;
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dh->dccph_x = 1;
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2005-09-16 17:58:40 -06:00
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dccp_hdr_set_seq(dh, dreq->dreq_iss);
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dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr);
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dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service;
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2005-08-09 21:14:34 -06:00
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2005-08-09 21:15:35 -06:00
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dh->dccph_checksum = dccp_v4_checksum(skb, inet_rsk(req)->loc_addr,
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inet_rsk(req)->rmt_addr);
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2005-08-09 21:14:34 -06:00
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DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
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return skb;
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}
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struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
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const enum dccp_reset_codes code)
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{
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struct dccp_hdr *dh;
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struct dccp_sock *dp = dccp_sk(sk);
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const int dccp_header_size = sizeof(struct dccp_hdr) +
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sizeof(struct dccp_hdr_ext) +
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sizeof(struct dccp_hdr_reset);
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struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
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dccp_header_size, 1,
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GFP_ATOMIC);
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if (skb == NULL)
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return NULL;
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|
|
/* Reserve space for headers. */
|
|
|
|
skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
|
|
|
|
|
|
|
|
skb->dst = dst_clone(dst);
|
|
|
|
skb->csum = 0;
|
|
|
|
|
|
|
|
dccp_inc_seqno(&dp->dccps_gss);
|
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_reset_code = code;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss;
|
|
|
|
dccp_insert_options(sk, skb);
|
|
|
|
|
|
|
|
skb->h.raw = skb_push(skb, dccp_header_size);
|
|
|
|
|
|
|
|
dh = dccp_hdr(skb);
|
|
|
|
memset(dh, 0, dccp_header_size);
|
|
|
|
|
|
|
|
dh->dccph_sport = inet_sk(sk)->sport;
|
|
|
|
dh->dccph_dport = inet_sk(sk)->dport;
|
2005-08-13 17:34:54 -06:00
|
|
|
dh->dccph_doff = (dccp_header_size +
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len) / 4;
|
2005-08-09 21:14:34 -06:00
|
|
|
dh->dccph_type = DCCP_PKT_RESET;
|
|
|
|
dh->dccph_x = 1;
|
|
|
|
dccp_hdr_set_seq(dh, dp->dccps_gss);
|
|
|
|
dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr);
|
|
|
|
|
|
|
|
dccp_hdr_reset(skb)->dccph_reset_code = code;
|
|
|
|
|
2005-08-09 21:15:35 -06:00
|
|
|
dh->dccph_checksum = dccp_v4_checksum(skb, inet_sk(sk)->saddr,
|
|
|
|
inet_sk(sk)->daddr);
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
|
|
|
|
return skb;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Do all connect socket setups that can be done AF independent.
|
|
|
|
*/
|
|
|
|
static inline void dccp_connect_init(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct dst_entry *dst = __sk_dst_get(sk);
|
|
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
|
|
|
|
sk->sk_err = 0;
|
|
|
|
sock_reset_flag(sk, SOCK_DONE);
|
|
|
|
|
|
|
|
dccp_sync_mss(sk, dst_mtu(dst));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* FIXME: set dp->{dccps_swh,dccps_swl}, with
|
|
|
|
* something like dccp_inc_seq
|
|
|
|
*/
|
|
|
|
|
|
|
|
icsk->icsk_retransmits = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int dccp_connect(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct sk_buff *skb;
|
|
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
|
|
|
|
dccp_connect_init(sk);
|
|
|
|
|
|
|
|
skb = alloc_skb(MAX_DCCP_HEADER + 15, sk->sk_allocation);
|
|
|
|
if (unlikely(skb == NULL))
|
|
|
|
return -ENOBUFS;
|
|
|
|
|
|
|
|
/* Reserve space for headers. */
|
|
|
|
skb_reserve(skb, MAX_DCCP_HEADER);
|
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
|
|
|
|
skb->csum = 0;
|
|
|
|
skb_set_owner_w(skb, sk);
|
|
|
|
|
|
|
|
BUG_TRAP(sk->sk_send_head == NULL);
|
|
|
|
sk->sk_send_head = skb;
|
|
|
|
dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
|
|
|
|
DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS);
|
|
|
|
|
|
|
|
/* Timer for repeating the REQUEST until an answer. */
|
2005-08-09 21:30:56 -06:00
|
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
|
|
|
|
icsk->icsk_rto, DCCP_RTO_MAX);
|
2005-08-09 21:14:34 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void dccp_send_ack(struct sock *sk)
|
|
|
|
{
|
|
|
|
/* If we have been reset, we may not send again. */
|
|
|
|
if (sk->sk_state != DCCP_CLOSED) {
|
|
|
|
struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
|
|
|
|
|
|
|
|
if (skb == NULL) {
|
|
|
|
inet_csk_schedule_ack(sk);
|
|
|
|
inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN;
|
2005-08-13 17:34:54 -06:00
|
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
|
|
|
|
TCP_DELACK_MAX,
|
|
|
|
DCCP_RTO_MAX);
|
2005-08-09 21:14:34 -06:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Reserve space for headers */
|
|
|
|
skb_reserve(skb, MAX_DCCP_HEADER);
|
|
|
|
skb->csum = 0;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK;
|
|
|
|
skb_set_owner_w(skb, sk);
|
|
|
|
dccp_transmit_skb(sk, skb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_send_ack);
|
|
|
|
|
|
|
|
void dccp_send_delayed_ack(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
/*
|
|
|
|
* FIXME: tune this timer. elapsed time fixes the skew, so no problem
|
|
|
|
* with using 2s, and active senders also piggyback the ACK into a
|
|
|
|
* DATAACK packet, so this is really for quiescent senders.
|
|
|
|
*/
|
|
|
|
unsigned long timeout = jiffies + 2 * HZ;
|
|
|
|
|
|
|
|
/* Use new timeout only if there wasn't a older one earlier. */
|
|
|
|
if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) {
|
|
|
|
/* If delack timer was blocked or is about to expire,
|
|
|
|
* send ACK now.
|
|
|
|
*
|
|
|
|
* FIXME: check the "about to expire" part
|
|
|
|
*/
|
|
|
|
if (icsk->icsk_ack.blocked) {
|
|
|
|
dccp_send_ack(sk);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!time_before(timeout, icsk->icsk_ack.timeout))
|
|
|
|
timeout = icsk->icsk_ack.timeout;
|
|
|
|
}
|
|
|
|
icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER;
|
|
|
|
icsk->icsk_ack.timeout = timeout;
|
|
|
|
sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout);
|
|
|
|
}
|
|
|
|
|
2005-08-17 00:10:59 -06:00
|
|
|
void dccp_send_sync(struct sock *sk, const u64 seq,
|
|
|
|
const enum dccp_pkt_type pkt_type)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
|
|
|
/*
|
|
|
|
* We are not putting this on the write queue, so
|
|
|
|
* dccp_transmit_skb() will set the ownership to this
|
|
|
|
* sock.
|
|
|
|
*/
|
|
|
|
struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
|
|
|
|
|
|
|
|
if (skb == NULL)
|
|
|
|
/* FIXME: how to make sure the sync is sent? */
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* Reserve space for headers and prepare control bits. */
|
|
|
|
skb_reserve(skb, MAX_DCCP_HEADER);
|
|
|
|
skb->csum = 0;
|
2005-08-17 00:10:59 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
|
2005-08-09 21:14:34 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_seq = seq;
|
|
|
|
|
|
|
|
skb_set_owner_w(skb, sk);
|
|
|
|
dccp_transmit_skb(sk, skb);
|
|
|
|
}
|
|
|
|
|
2005-08-13 17:34:54 -06:00
|
|
|
/*
|
|
|
|
* Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This
|
|
|
|
* cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under
|
|
|
|
* any circumstances.
|
2005-08-09 21:14:34 -06:00
|
|
|
*/
|
2005-08-23 22:50:06 -06:00
|
|
|
void dccp_send_close(struct sock *sk, const int active)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
|
|
struct sk_buff *skb;
|
2005-08-23 22:50:06 -06:00
|
|
|
const unsigned int prio = active ? GFP_KERNEL : GFP_ATOMIC;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2005-08-23 22:50:06 -06:00
|
|
|
skb = alloc_skb(sk->sk_prot->max_header, prio);
|
|
|
|
if (skb == NULL)
|
|
|
|
return;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
/* Reserve space for headers and prepare control bits. */
|
|
|
|
skb_reserve(skb, sk->sk_prot->max_header);
|
|
|
|
skb->csum = 0;
|
2005-08-13 17:34:54 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ?
|
|
|
|
DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
skb_set_owner_w(skb, sk);
|
2005-08-23 22:50:06 -06:00
|
|
|
if (active) {
|
|
|
|
BUG_TRAP(sk->sk_send_head == NULL);
|
|
|
|
sk->sk_send_head = skb;
|
|
|
|
dccp_transmit_skb(sk, skb_clone(skb, prio));
|
|
|
|
} else
|
|
|
|
dccp_transmit_skb(sk, skb);
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|