X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fdccp%2Foutput.c;h=3435542e96528f5cce06257980e7ee95cc28ccf8;hb=a2f44b27303a5353859d77a3e96a1d3f33f56ab7;hp=efd7ffb903a149a46d38d57e691b20bfba416c67;hpb=134734d875a0a48d994ef20b9905209b4b8b6f75;p=linux-2.6.git

diff --git a/net/dccp/output.c b/net/dccp/output.c
index efd7ffb90..3435542e9 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -1,6 +1,6 @@
 /*
  *  net/dccp/output.c
- * 
+ *
  *  An implementation of the DCCP protocol
  *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  *
@@ -10,7 +10,6 @@
  *	2 of the License, or (at your option) any later version.
  */
 
-#include <linux/config.h>
 #include <linux/dccp.h>
 #include <linux/kernel.h>
 #include <linux/skbuff.h>
@@ -27,7 +26,7 @@ static inline void dccp_event_ack_sent(struct sock *sk)
 	inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
 }
 
-static inline void 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);
@@ -49,7 +48,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 		struct dccp_hdr *dh;
 		/* XXX For now we're using only 48 bits sequence numbers */
-		const int dccp_header_size = sizeof(*dh) +
+		const u32 dccp_header_size = sizeof(*dh) +
 					     sizeof(struct dccp_hdr_ext) +
 					  dccp_packet_hdr_len(dcb->dccpd_type);
 		int err, set_ack = 1;
@@ -64,6 +63,10 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		case DCCP_PKT_DATAACK:
 			break;
 
+		case DCCP_PKT_REQUEST:
+			set_ack = 0;
+			/* fall through */
+
 		case DCCP_PKT_SYNC:
 		case DCCP_PKT_SYNCACK:
 			ackno = dcb->dccpd_seq;
@@ -79,18 +82,21 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 		}
 
 		dcb->dccpd_seq = dp->dccps_gss;
-		dccp_insert_options(sk, skb);
+
+		if (dccp_insert_options(sk, skb)) {
+			kfree_skb(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;
 
@@ -110,7 +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);
@@ -119,16 +125,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
 
 		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;
+		return net_xmit_eval(err);
 	}
 	return -ENOBUFS;
 }
@@ -178,37 +175,29 @@ void dccp_write_space(struct sock *sk)
 /**
  * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
  * @sk: socket to wait for
- * @timeo: for how long
  */
-static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb,
-			      long *timeo)
+static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	DEFINE_WAIT(wait);
-	long delay;
+	unsigned long delay;
 	int rc;
 
 	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;
 		if (signal_pending(current))
 			goto do_interrupted;
 
-		rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
-					    skb->len);
+		rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
 		if (rc <= 0)
 			break;
 		delay = msecs_to_jiffies(rc);
-		if (delay > *timeo || delay < 0)
-			goto do_nonblock;
-
 		sk->sk_write_pending++;
 		release_sock(sk);
-		*timeo -= schedule_timeout(delay);
+		schedule_timeout(delay);
 		lock_sock(sk);
 		sk->sk_write_pending--;
 	}
@@ -219,45 +208,70 @@ out:
 do_error:
 	rc = -EPIPE;
 	goto out;
-do_nonblock:
-	rc = -EAGAIN;
-	goto out;
 do_interrupted:
-	rc = sock_intr_errno(*timeo);
+	rc = -EINTR;
 	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,
-					 skb->len);
+	struct dccp_sock *dp = dccp_sk(sk);
+	struct sk_buff *skb;
 
-	if (err > 0)
-		err = dccp_wait_for_ccid(sk, skb, timeo);
+	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);
+			if (err && err != -EINTR)
+				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 {
+			dccp_pr_debug("packet discarded\n");
+			kfree(skb);
+		}
+	}
 }
 
 int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
@@ -275,30 +289,32 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
 {
 	struct dccp_hdr *dh;
 	struct dccp_request_sock *dreq;
-	const int dccp_header_size = sizeof(struct dccp_hdr) +
+	const u32 dccp_header_size = sizeof(struct dccp_hdr) +
 				     sizeof(struct dccp_hdr_ext) +
 				     sizeof(struct dccp_hdr_response);
-	struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
-					       dccp_header_size, 1,
+	struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1,
 					   GFP_ATOMIC);
 	if (skb == NULL)
 		return NULL;
 
 	/* Reserve space for headers. */
-	skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
+	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;
-	dccp_insert_options(sk, skb);
 
-	skb->h.raw = skb_push(skb, dccp_header_size);
+	if (dccp_insert_options(sk, skb)) {
+		kfree_skb(skb);
+		return NULL;
+	}
 
-	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;
@@ -310,47 +326,46 @@ 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;
 
-	dh->dccph_checksum = dccp_v4_checksum(skb, inet_rsk(req)->loc_addr,
-					      inet_rsk(req)->rmt_addr);
+	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;
 }
 
 EXPORT_SYMBOL_GPL(dccp_make_response);
 
-struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
-				const enum dccp_reset_codes code)
-				   
+static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
+				       const enum dccp_reset_codes code)
 {
 	struct dccp_hdr *dh;
 	struct dccp_sock *dp = dccp_sk(sk);
-	const int dccp_header_size = sizeof(struct dccp_hdr) +
+	const u32 dccp_header_size = sizeof(struct dccp_hdr) +
 				     sizeof(struct dccp_hdr_ext) +
 				     sizeof(struct dccp_hdr_reset);
-	struct sk_buff *skb = sock_wmalloc(sk, MAX_HEADER + DCCP_MAX_OPT_LEN +
-					       dccp_header_size, 1,
+	struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1,
 					   GFP_ATOMIC);
 	if (skb == NULL)
 		return NULL;
 
 	/* Reserve space for headers. */
-	skb_reserve(skb, MAX_HEADER + DCCP_MAX_OPT_LEN + dccp_header_size);
+	skb_reserve(skb, sk->sk_prot->max_header);
 
 	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);
+	if (dccp_insert_options(sk, skb)) {
+		kfree_skb(skb);
+		return NULL;
+	}
 
-	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;
@@ -362,14 +377,33 @@ 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;
-
-	dh->dccph_checksum = dccp_v4_checksum(skb, inet_sk(sk)->saddr,
-					      inet_sk(sk)->daddr);
+	inet_csk(sk)->icsk_af_ops->send_check(sk, 0, skb);
 
 	DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 	return skb;
 }
 
+int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
+{
+	/*
+	 * FIXME: what if rebuild_header fails?
+	 * Should we be doing a rebuild_header here?
+	 */
+	int err = inet_sk_rebuild_header(sk);
+
+	if (err == 0) {
+		struct sk_buff *skb = dccp_make_reset(sk, sk->sk_dst_cache,
+						      code);
+		if (skb != NULL) {
+			memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+			err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
+			return net_xmit_eval(err);
+		}
+	}
+
+	return err;
+}
+
 /*
  * Do all connect socket setups that can be done AF independent.
  */
@@ -384,18 +418,25 @@ 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:
 	 *	SWL := max(GSR + 1 - floor(W/4), ISR),
 	 *	AWL := max(GSS - W' + 1, ISS).
 	 * 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)
@@ -405,15 +446,14 @@ int dccp_connect(struct sock *sk)
 
 	dccp_connect_init(sk);
 
-	skb = alloc_skb(MAX_DCCP_HEADER + 15, sk->sk_allocation);
+	skb = alloc_skb(sk->sk_prot->max_header, sk->sk_allocation);
 	if (unlikely(skb == NULL))
 		return -ENOBUFS;
 
 	/* Reserve space for headers. */
-	skb_reserve(skb, MAX_DCCP_HEADER);
+	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));
@@ -431,7 +471,8 @@ 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);
+		struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header,
+						GFP_ATOMIC);
 
 		if (skb == NULL) {
 			inet_csk_schedule_ack(sk);
@@ -443,8 +484,7 @@ void dccp_send_ack(struct sock *sk)
 		}
 
 		/* Reserve space for headers */
-		skb_reserve(skb, MAX_DCCP_HEADER);
-		skb->csum = 0;
+		skb_reserve(skb, sk->sk_prot->max_header);
 		DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK;
 		dccp_transmit_skb(sk, skb);
 	}
@@ -490,21 +530,22 @@ void dccp_send_sync(struct sock *sk, const u64 seq,
 	 * dccp_transmit_skb() will set the ownership to this
 	 * sock.
 	 */
-	struct sk_buff *skb = alloc_skb(MAX_DCCP_HEADER, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(sk->sk_prot->max_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;
+	skb_reserve(skb, sk->sk_prot->max_header);
 	DCCP_SKB_CB(skb)->dccpd_type = pkt_type;
 	DCCP_SKB_CB(skb)->dccpd_seq = seq;
 
 	dccp_transmit_skb(sk, skb);
 }
 
+EXPORT_SYMBOL_GPL(dccp_send_sync);
+
 /*
  * 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
@@ -522,13 +563,14 @@ 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);
 }