X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=net%2Fdccp%2Foutput.c;h=bfd9c5757897c18d0a50b83f8ce0471f8b33d79d;hb=59348b19efebfd6a8d0791ff81d207b16594c94b;hp=58669beee1329cde9edbe2eda112594917007b79;hpb=6fa0cb1141da80eed4f86155fb51931bc1c31888;p=powerpc.git

diff --git a/net/dccp/output.c b/net/dccp/output.c
index 58669beee1..bfd9c57578 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -88,16 +88,15 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 			return -EPROTO;
 		}
 		
-		skb->h.raw = skb_push(skb, dccp_header_size);
-		dh = dccp_hdr(skb);
 
 		/* Build DCCP header and checksum it. */
-		memset(dh, 0, dccp_header_size);
+		dh = dccp_zeroed_hdr(skb, dccp_header_size);
 		dh->dccph_type	= dcb->dccpd_type;
 		dh->dccph_sport	= inet->sport;
 		dh->dccph_dport	= inet->dport;
 		dh->dccph_doff	= (dccp_header_size + dcb->dccpd_opt_len) / 4;
 		dh->dccph_ccval	= dcb->dccpd_ccval;
+		dh->dccph_cscov = dp->dccps_pcslen;
 		/* XXX For now we're using only 48 bits sequence numbers */
 		dh->dccph_x	= 1;
 
@@ -117,7 +116,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 			break;
 		}
 
-		icsk->icsk_af_ops->send_check(sk, skb->len, skb);
+		icsk->icsk_af_ops->send_check(sk, 0, skb);
 
 		if (set_ack)
 			dccp_event_ack_sent(sk);
@@ -125,17 +124,8 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 
 		memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-		err = icsk->icsk_af_ops->queue_xmit(skb, 0);
-		if (err <= 0)
-			return err;
-
-		/* NET_XMIT_CN is special. It does not guarantee,
-		 * that this packet is lost. It tells that device
-		 * is about to start to drop packets or already
-		 * drops some packets of the same priority and
-		 * invokes us to send less aggressively.
-		 */
-		return err == NET_XMIT_CN ? 0 : err;
+		err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0);
+		return net_xmit_eval(err);
 	}
 	return -ENOBUFS;
 }
@@ -198,7 +188,7 @@ static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb,
 	while (1) {
 		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 
-		if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+		if (sk->sk_err)
 			goto do_error;
 		if (!*timeo)
 			goto do_nonblock;
@@ -234,37 +224,68 @@ do_interrupted:
 	goto out;
 }
 
-int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo)
+static void dccp_write_xmit_timer(unsigned long data) {
+	struct sock *sk = (struct sock *)data;
+	struct dccp_sock *dp = dccp_sk(sk);
+
+	bh_lock_sock(sk);
+	if (sock_owned_by_user(sk))
+		sk_reset_timer(sk, &dp->dccps_xmit_timer, jiffies+1);
+	else
+		dccp_write_xmit(sk, 0);
+	bh_unlock_sock(sk);
+	sock_put(sk);
+}
+
+void dccp_write_xmit(struct sock *sk, int block)
 {
-	const struct dccp_sock *dp = dccp_sk(sk);
-	int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
+	struct dccp_sock *dp = dccp_sk(sk);
+	struct sk_buff *skb;
+	long timeo = DCCP_XMIT_TIMEO; 	/* If a packet is taking longer than
+					   this we have other issues */
+
+	while ((skb = skb_peek(&sk->sk_write_queue))) {
+		int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
 					 skb->len);
 
-	if (err > 0)
-		err = dccp_wait_for_ccid(sk, skb, timeo);
+		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, &timeo);
+				timeo = DCCP_XMIT_TIMEO;
+			}
+			if (err)
+				DCCP_BUG("err=%d after dccp_wait_for_ccid", err);
+		}
 
-	if (err == 0) {
-		struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
-		const int len = skb->len;
+		skb_dequeue(&sk->sk_write_queue);
+		if (err == 0) {
+			struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
+			const int len = skb->len;
 
-		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,
+			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);
-	} else
-		kfree_skb(skb);
-
-	return err;
+				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
+			kfree(skb);
+	}
 }
 
 int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
@@ -294,9 +315,10 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
 	skb_reserve(skb, sk->sk_prot->max_header);
 
 	skb->dst = dst_clone(dst);
-	skb->csum = 0;
 
 	dreq = dccp_rsk(req);
+	if (inet_rsk(req)->acked)	/* increase ISS upon retransmission */
+		dccp_inc_seqno(&dreq->dreq_iss);
 	DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
 	DCCP_SKB_CB(skb)->dccpd_seq  = dreq->dreq_iss;
 
@@ -305,10 +327,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
 		return NULL;
 	}
 
-	skb->h.raw = skb_push(skb, dccp_header_size);
-
-	dh = dccp_hdr(skb);
-	memset(dh, 0, dccp_header_size);
+	/* Build and checksum header */
+	dh = dccp_zeroed_hdr(skb, dccp_header_size);
 
 	dh->dccph_sport	= inet_sk(sk)->sport;
 	dh->dccph_dport	= inet_rsk(req)->rmt_port;
@@ -320,6 +340,10 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
 	dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr);
 	dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service;
 
+	dccp_csum_outgoing(skb);
+
+	/* We use `acked' to remember that a Response was already sent. */
+	inet_rsk(req)->acked = 1;
 	DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 	return skb;
 }
@@ -344,7 +368,6 @@ static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
 	skb_reserve(skb, sk->sk_prot->max_header);
 
 	skb->dst = dst_clone(dst);
-	skb->csum = 0;
 
 	dccp_inc_seqno(&dp->dccps_gss);
 
@@ -357,10 +380,7 @@ static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
 		return NULL;
 	}
 
-	skb->h.raw = skb_push(skb, dccp_header_size);
-
-	dh = dccp_hdr(skb);
-	memset(dh, 0, dccp_header_size);
+	dh = dccp_zeroed_hdr(skb, dccp_header_size);
 
 	dh->dccph_sport	= inet_sk(sk)->sport;
 	dh->dccph_dport	= inet_sk(sk)->dport;
@@ -372,7 +392,7 @@ static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
 	dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr);
 
 	dccp_hdr_reset(skb)->dccph_reset_code = code;
-	inet_csk(sk)->icsk_af_ops->send_check(sk, skb->len, skb);
+	inet_csk(sk)->icsk_af_ops->send_check(sk, 0, skb);
 
 	DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 	return skb;
@@ -391,9 +411,8 @@ int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
 						      code);
 		if (skb != NULL) {
 			memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-			err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
-			if (err == NET_XMIT_CN)
-				err = 0;
+			err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, sk, 0);
+			return net_xmit_eval(err);
 		}
 	}
 
@@ -414,7 +433,6 @@ static inline void dccp_connect_init(struct sock *sk)
 	
 	dccp_sync_mss(sk, dst_mtu(dst));
 
-	dccp_update_gss(sk, dp->dccps_iss);
  	/*
 	 * SWL and AWL are initially adjusted so that they are not less than
 	 * the initial Sequence Numbers received and sent, respectively:
@@ -423,9 +441,17 @@ static inline void dccp_connect_init(struct sock *sk)
 	 * These adjustments MUST be applied only at the beginning of the
 	 * connection.
  	 */
+	dccp_update_gss(sk, dp->dccps_iss);
 	dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
 
+	/* S.GAR - greatest valid acknowledgement number received on a non-Sync;
+	 *         initialized to S.ISS (sec. 8.5)                            */
+	dp->dccps_gar = dp->dccps_iss;
+
 	icsk->icsk_retransmits = 0;
+	init_timer(&dp->dccps_xmit_timer);
+	dp->dccps_xmit_timer.data = (unsigned long)sk;
+	dp->dccps_xmit_timer.function = dccp_write_xmit_timer;
 }
 
 int dccp_connect(struct sock *sk)
@@ -443,7 +469,6 @@ int dccp_connect(struct sock *sk)
 	skb_reserve(skb, sk->sk_prot->max_header);
 
 	DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST;
-	skb->csum = 0;
 
 	dccp_skb_entail(sk, skb);
 	dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL));
@@ -475,7 +500,6 @@ void dccp_send_ack(struct sock *sk)
 
 		/* Reserve space for headers */
 		skb_reserve(skb, sk->sk_prot->max_header);
-		skb->csum = 0;
 		DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK;
 		dccp_transmit_skb(sk, skb);
 	}
@@ -529,7 +553,6 @@ void dccp_send_sync(struct sock *sk, const u64 seq,
 
 	/* Reserve space for headers and prepare control bits. */
 	skb_reserve(skb, sk->sk_prot->max_header);
-	skb->csum = 0;
 	DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
 	DCCP_SKB_CB(skb)->dccpd_seq = seq;
 
@@ -555,13 +578,14 @@ void dccp_send_close(struct sock *sk, const int active)
 
 	/* Reserve space for headers and prepare control bits. */
 	skb_reserve(skb, sk->sk_prot->max_header);
-	skb->csum = 0;
 	DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ?
 					DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ;
 
 	if (active) {
+		dccp_write_xmit(sk, 1);
 		dccp_skb_entail(sk, skb);
 		dccp_transmit_skb(sk, skb_clone(skb, prio));
+		/* FIXME do we need a retransmit timer here? */
 	} else
 		dccp_transmit_skb(sk, skb);
 }