inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
}
-/* enqueue @skb on sk_send_head for retransmission, return clone to send now */
-static struct sk_buff *dccp_skb_entail(struct sock *sk, struct sk_buff *skb)
+static void dccp_skb_entail(struct sock *sk, struct sk_buff *skb)
{
skb_set_owner_w(skb, sk);
WARN_ON(sk->sk_send_head);
sk->sk_send_head = skb;
- return skb_clone(sk->sk_send_head, gfp_any());
}
/*
struct inet_connection_sock *icsk = inet_csk(sk);
struct dccp_sock *dp = dccp_sk(sk);
u32 ccmps = dccp_determine_ccmps(dp);
- u32 cur_mps = ccmps ? min(pmtu, ccmps) : pmtu;
+ int cur_mps = ccmps ? min(pmtu, ccmps) : pmtu;
/* Account for header lengths and IPv4/v6 option overhead */
cur_mps -= (icsk->icsk_af_ops->net_header_len + icsk->icsk_ext_hdr_len +
sizeof(struct dccp_hdr) + sizeof(struct dccp_hdr_ext));
/*
- * Leave enough headroom for common DCCP header options.
- * This only considers options which may appear on DCCP-Data packets, as
- * per table 3 in RFC 4340, 5.8. When running out of space for other
- * options (eg. Ack Vector which can take up to 255 bytes), it is better
- * to schedule a separate Ack. Thus we leave headroom for the following:
- * - 1 byte for Slow Receiver (11.6)
- * - 6 bytes for Timestamp (13.1)
- * - 10 bytes for Timestamp Echo (13.3)
- * - 8 bytes for NDP count (7.7, when activated)
- * - 6 bytes for Data Checksum (9.3)
- * - %DCCPAV_MIN_OPTLEN bytes for Ack Vector size (11.4, when enabled)
+ * FIXME: this should come from the CCID infrastructure, where, say,
+ * TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets
+ * put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED
+ * TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to
+ * make it a multiple of 4
*/
- cur_mps -= roundup(1 + 6 + 10 + dp->dccps_send_ndp_count * 8 + 6 +
- (dp->dccps_hc_rx_ackvec ? DCCPAV_MIN_OPTLEN : 0), 4);
+
+ cur_mps -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4;
/* And store cached results */
icsk->icsk_pmtu_cookie = pmtu;
}
/**
- * dccp_wait_for_ccid - Await CCID send permission
+ * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
* @sk: socket to wait for
- * @delay: timeout in jiffies
- * This is used by CCIDs which need to delay the send time in process context.
+ * @skb: current skb to pass on for waiting
+ * @delay: sleep timeout in milliseconds (> 0)
+ * This function is called by default when the socket is closed, and
+ * when a non-zero linger time is set on the socket. For consistency
*/
-static int dccp_wait_for_ccid(struct sock *sk, unsigned long delay)
+static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb, int delay)
{
+ struct dccp_sock *dp = dccp_sk(sk);
DEFINE_WAIT(wait);
- long remaining;
-
- prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
- sk->sk_write_pending++;
- release_sock(sk);
+ unsigned long jiffdelay;
+ int rc;
- remaining = schedule_timeout(delay);
-
- lock_sock(sk);
- sk->sk_write_pending--;
- finish_wait(sk->sk_sleep, &wait);
+ do {
+ dccp_pr_debug("delayed send by %d msec\n", delay);
+ jiffdelay = msecs_to_jiffies(delay);
- if (signal_pending(current) || sk->sk_err)
- return -1;
- return remaining;
-}
-
-/**
- * dccp_xmit_packet - Send data packet under control of CCID
- * Transmits next-queued payload and informs CCID to account for the packet.
- */
-static void dccp_xmit_packet(struct sock *sk)
-{
- int err, len;
- struct dccp_sock *dp = dccp_sk(sk);
- struct sk_buff *skb = dccp_qpolicy_pop(sk);
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
- if (unlikely(skb == NULL))
- return;
- len = skb->len;
+ sk->sk_write_pending++;
+ release_sock(sk);
+ schedule_timeout(jiffdelay);
+ lock_sock(sk);
+ sk->sk_write_pending--;
- if (sk->sk_state == DCCP_PARTOPEN) {
- const u32 cur_mps = dp->dccps_mss_cache - DCCP_FEATNEG_OVERHEAD;
- /*
- * See 8.1.5 - Handshake Completion.
- *
- * For robustness we resend Confirm options until the client has
- * entered OPEN. During the initial feature negotiation, the MPS
- * is smaller than usual, reduced by the Change/Confirm options.
- */
- if (!list_empty(&dp->dccps_featneg) && len > cur_mps) {
- DCCP_WARN("Payload too large (%d) for featneg.\n", len);
- dccp_send_ack(sk);
- dccp_feat_list_purge(&dp->dccps_featneg);
- }
+ if (sk->sk_err)
+ goto do_error;
+ if (signal_pending(current))
+ goto do_interrupted;
- inet_csk_schedule_ack(sk);
- inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
- inet_csk(sk)->icsk_rto,
- DCCP_RTO_MAX);
- DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_DATAACK;
- } else if (dccp_ack_pending(sk)) {
- DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_DATAACK;
- } else {
- DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_DATA;
- }
-
- err = dccp_transmit_skb(sk, skb);
- if (err)
- dccp_pr_debug("transmit_skb() returned err=%d\n", err);
- /*
- * Register this one as sent even if an error occurred. To the remote
- * end a local packet drop is indistinguishable from network loss, i.e.
- * any local drop will eventually be reported via receiver feedback.
- */
- ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, len);
-
- /*
- * If the CCID needs to transfer additional header options out-of-band
- * (e.g. Ack Vectors or feature-negotiation options), it activates this
- * flag to schedule a Sync. The Sync will automatically incorporate all
- * currently pending header options, thus clearing the backlog.
- */
- if (dp->dccps_sync_scheduled)
- dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC);
+ rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
+ } while ((delay = rc) > 0);
+out:
+ finish_wait(sk->sk_sleep, &wait);
+ return rc;
+
+do_error:
+ rc = -EPIPE;
+ goto out;
+do_interrupted:
+ rc = -EINTR;
+ goto out;
}
-/**
- * dccp_flush_write_queue - Drain queue at end of connection
- * Since dccp_sendmsg queues packets without waiting for them to be sent, it may
- * happen that the TX queue is not empty at the end of a connection. We give the
- * HC-sender CCID a grace period of up to @time_budget jiffies. If this function
- * returns with a non-empty write queue, it will be purged later.
- */
-void dccp_flush_write_queue(struct sock *sk, long *time_budget)
+void dccp_write_xmit(struct sock *sk, int block)
{
struct dccp_sock *dp = dccp_sk(sk);
struct sk_buff *skb;
- long delay, rc;
-
- while (*time_budget > 0 && (skb = skb_peek(&sk->sk_write_queue))) {
- rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
- switch (ccid_packet_dequeue_eval(rc)) {
- case CCID_PACKET_WILL_DEQUEUE_LATER:
- /*
- * If the CCID determines when to send, the next sending
- * time is unknown or the CCID may not even send again
- * (e.g. remote host crashes or lost Ack packets).
- */
- DCCP_WARN("CCID did not manage to send all packets\n");
- return;
- case CCID_PACKET_DELAY:
- delay = msecs_to_jiffies(rc);
- if (delay > *time_budget)
- return;
- rc = dccp_wait_for_ccid(sk, delay);
- if (rc < 0)
- return;
- *time_budget -= (delay - rc);
- /* check again if we can send now */
- break;
- case CCID_PACKET_SEND_AT_ONCE:
- dccp_xmit_packet(sk);
- break;
- case CCID_PACKET_ERR:
- skb_dequeue(&sk->sk_write_queue);
- kfree_skb(skb);
- dccp_pr_debug("packet discarded due to err=%ld\n", rc);
+ while ((skb = skb_peek(&sk->sk_write_queue))) {
+ int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
+
+ if (err > 0) {
+ if (!block) {
+ sk_reset_timer(sk, &dp->dccps_xmit_timer,
+ msecs_to_jiffies(err)+jiffies);
+ break;
+ } else
+ err = dccp_wait_for_ccid(sk, skb, err);
+ if (err && err != -EINTR)
+ DCCP_BUG("err=%d after dccp_wait_for_ccid", err);
}
- }
-}
-void dccp_write_xmit(struct sock *sk)
-{
- struct dccp_sock *dp = dccp_sk(sk);
- struct sk_buff *skb;
+ skb_dequeue(&sk->sk_write_queue);
+ if (err == 0) {
+ struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
+ const int len = skb->len;
- while ((skb = dccp_qpolicy_top(sk))) {
- int rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
-
- switch (ccid_packet_dequeue_eval(rc)) {
- case CCID_PACKET_WILL_DEQUEUE_LATER:
- return;
- case CCID_PACKET_DELAY:
- sk_reset_timer(sk, &dp->dccps_xmit_timer,
- jiffies + msecs_to_jiffies(rc));
- return;
- case CCID_PACKET_SEND_AT_ONCE:
- dccp_xmit_packet(sk);
- break;
- case CCID_PACKET_ERR:
- dccp_qpolicy_drop(sk, skb);
- dccp_pr_debug("packet discarded due to err=%d\n", rc);
+ if (sk->sk_state == DCCP_PARTOPEN) {
+ /* See 8.1.5. Handshake Completion */
+ inet_csk_schedule_ack(sk);
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
+ inet_csk(sk)->icsk_rto,
+ DCCP_RTO_MAX);
+ dcb->dccpd_type = DCCP_PKT_DATAACK;
+ } else if (dccp_ack_pending(sk))
+ dcb->dccpd_type = DCCP_PKT_DATAACK;
+ else
+ dcb->dccpd_type = DCCP_PKT_DATA;
+
+ err = dccp_transmit_skb(sk, skb);
+ ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
+ if (err)
+ DCCP_BUG("err=%d after ccid_hc_tx_packet_sent",
+ err);
+ } else {
+ dccp_pr_debug("packet discarded due to err=%d\n", err);
+ kfree_skb(skb);
}
}
}
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss;
- /* Resolve feature dependencies resulting from choice of CCID */
- if (dccp_feat_server_ccid_dependencies(dreq))
- goto response_failed;
-
- if (dccp_insert_options_rsk(dreq, skb))
- goto response_failed;
+ if (dccp_insert_options_rsk(dreq, skb)) {
+ kfree_skb(skb);
+ return NULL;
+ }
/* Build and checksum header */
dh = dccp_zeroed_hdr(skb, dccp_header_size);
- dh->dccph_sport = inet_sk(sk)->sport;
+ dh->dccph_sport = inet_rsk(req)->loc_port;
dh->dccph_dport = inet_rsk(req)->rmt_port;
dh->dccph_doff = (dccp_header_size +
DCCP_SKB_CB(skb)->dccpd_opt_len) / 4;
inet_rsk(req)->acked = 1;
DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
return skb;
-response_failed:
- kfree_skb(skb);
- return NULL;
}
EXPORT_SYMBOL_GPL(dccp_make_response);
/*
* Do all connect socket setups that can be done AF independent.
*/
-int dccp_connect(struct sock *sk)
+static inline void dccp_connect_init(struct sock *sk)
{
- struct sk_buff *skb;
struct dccp_sock *dp = dccp_sk(sk);
struct dst_entry *dst = __sk_dst_get(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
dccp_sync_mss(sk, dst_mtu(dst));
- /* do not connect if feature negotiation setup fails */
- if (dccp_feat_finalise_settings(dccp_sk(sk)))
- return -EPROTO;
-
/* Initialise GAR as per 8.5; AWL/AWH are set in dccp_transmit_skb() */
dp->dccps_gar = dp->dccps_iss;
+ 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(sk->sk_prot->max_header, sk->sk_allocation);
if (unlikely(skb == NULL))
return -ENOBUFS;
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
- dccp_transmit_skb(sk, dccp_skb_entail(sk, skb));
+ dccp_skb_entail(sk, skb);
+ dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS);
/* Timer for repeating the REQUEST until an answer. */
- icsk->icsk_retransmits = 0;
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
icsk->icsk_rto, DCCP_RTO_MAX);
return 0;
DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
DCCP_SKB_CB(skb)->dccpd_ack_seq = ackno;
- /*
- * Clear the flag in case the Sync was scheduled for out-of-band data,
- * such as carrying a long Ack Vector.
- */
- dccp_sk(sk)->dccps_sync_scheduled = 0;
-
dccp_transmit_skb(sk, skb);
}
DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSE;
if (active) {
- skb = dccp_skb_entail(sk, skb);
+ dccp_write_xmit(sk, 1);
+ dccp_skb_entail(sk, skb);
+ dccp_transmit_skb(sk, skb_clone(skb, prio));
/*
* Retransmission timer for active-close: RFC 4340, 8.3 requires
* to retransmit the Close/CloseReq until the CLOSING/CLOSEREQ
*/
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
DCCP_TIMEOUT_INIT, DCCP_RTO_MAX);
- }
- dccp_transmit_skb(sk, skb);
+ } else
+ dccp_transmit_skb(sk, skb);
}
projects / linux-2.6-omap-h63xx.git / blobdiff