X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=net%2Fdccp%2Foptions.c;h=c3cda1e39aa8ccc500e4e7a36b0e72679d94a8ed;hb=ba290ab7dace8b3339c0cc86c221d48eed21e956;hp=d4c4242d8dd7c5de227784b42c048f5f18b41027;hpb=d58dde0f552a5c5c4485b962d8b6e9dd54fefb30;p=linux-2.6-omap-h63xx.git

diff --git a/net/dccp/options.c b/net/dccp/options.c
index d4c4242d8dd..c3cda1e39aa 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -11,33 +11,32 @@
  *      as published by the Free Software Foundation; either version
  *      2 of the License, or (at your option) any later version.
  */
-#include <linux/config.h>
 #include <linux/dccp.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/skbuff.h>
 
+#include "ackvec.h"
 #include "ccid.h"
 #include "dccp.h"
+#include "feat.h"
 
-static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
-					     struct sock *sk,
-					     const u64 ackno,
-					     const unsigned char len,
-					     const unsigned char *vector);
-
-/* stores the default values for new connection. may be changed with sysctl */
-static const struct dccp_options dccpo_default_values = {
-	.dccpo_sequence_window	  = DCCPF_INITIAL_SEQUENCE_WINDOW,
-	.dccpo_ccid		  = DCCPF_INITIAL_CCID,
-	.dccpo_send_ack_vector	  = DCCPF_INITIAL_SEND_ACK_VECTOR,
-	.dccpo_send_ndp_count	  = DCCPF_INITIAL_SEND_NDP_COUNT,
-};
-
-void dccp_options_init(struct dccp_options *dccpo)
+int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
+int dccp_feat_default_rx_ccid	      = DCCPF_INITIAL_CCID;
+int dccp_feat_default_tx_ccid	      = DCCPF_INITIAL_CCID;
+int dccp_feat_default_ack_ratio	      = DCCPF_INITIAL_ACK_RATIO;
+int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
+int dccp_feat_default_send_ndp_count  = DCCPF_INITIAL_SEND_NDP_COUNT;
+
+void dccp_minisock_init(struct dccp_minisock *dmsk)
 {
-	memcpy(dccpo, &dccpo_default_values, sizeof(*dccpo));
+	dmsk->dccpms_sequence_window = dccp_feat_default_sequence_window;
+	dmsk->dccpms_rx_ccid	     = dccp_feat_default_rx_ccid;
+	dmsk->dccpms_tx_ccid	     = dccp_feat_default_tx_ccid;
+	dmsk->dccpms_ack_ratio	     = dccp_feat_default_ack_ratio;
+	dmsk->dccpms_send_ack_vector = dccp_feat_default_send_ack_vector;
+	dmsk->dccpms_send_ndp_count  = dccp_feat_default_send_ndp_count;
 }
 
 static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
@@ -73,9 +72,12 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 	unsigned char opt, len;
 	unsigned char *value;
 	u32 elapsed_time;
+	int rc;
+	int mandatory = 0;
 
 	memset(opt_recv, 0, sizeof(*opt_recv));
 
+	opt = len = 0;
 	while (opt_ptr != opt_end) {
 		opt   = *opt_ptr++;
 		len   = 0;
@@ -104,6 +106,12 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 		switch (opt) {
 		case DCCPO_PADDING:
 			break;
+		case DCCPO_MANDATORY:
+			if (mandatory)
+				goto out_invalid_option;
+			if (pkt_type != DCCP_PKT_DATA)
+				mandatory = 1;
+			break;
 		case DCCPO_NDP_COUNT:
 			if (len > 3)
 				goto out_invalid_option;
@@ -112,32 +120,45 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 			dccp_pr_debug("%sNDP count=%d\n", debug_prefix,
 				      opt_recv->dccpor_ndp);
 			break;
-		case DCCPO_ACK_VECTOR_0:
-			if (len > DCCP_MAX_ACK_VECTOR_LEN)
+		case DCCPO_CHANGE_L:
+			/* fall through */
+		case DCCPO_CHANGE_R:
+			if (len < 2)
 				goto out_invalid_option;
-
+			rc = dccp_feat_change_recv(sk, opt, *value, value + 1,
+						   len - 1);
+			/*
+			 * When there is a change error, change_recv is
+			 * responsible for dealing with it.  i.e. reply with an
+			 * empty confirm.
+			 * If the change was mandatory, then we need to die.
+			 */
+			if (rc && mandatory)
+				goto out_invalid_option;
+			break;
+		case DCCPO_CONFIRM_L:
+			/* fall through */
+		case DCCPO_CONFIRM_R:
+			if (len < 2)
+				goto out_invalid_option;
+			if (dccp_feat_confirm_recv(sk, opt, *value,
+						   value + 1, len - 1))
+				goto out_invalid_option;
+			break;
+		case DCCPO_ACK_VECTOR_0:
+		case DCCPO_ACK_VECTOR_1:
 			if (pkt_type == DCCP_PKT_DATA)
-				continue;
-
-			opt_recv->dccpor_ack_vector_len = len;
-			opt_recv->dccpor_ack_vector_idx = value - options;
+				break;
 
-			dccp_pr_debug("%sACK vector 0, len=%d, ack_ackno=%llu\n",
-				      debug_prefix, len,
-				      (unsigned long long)
-				      DCCP_SKB_CB(skb)->dccpd_ack_seq);
-			dccp_ackvector_print(DCCP_SKB_CB(skb)->dccpd_ack_seq,
-					     value, len);
-			dccp_ackpkts_check_rcv_ackvector(dp->dccps_hc_rx_ackpkts,
-							 sk,
-						 DCCP_SKB_CB(skb)->dccpd_ack_seq,
-							 len, value);
+			if (dccp_msk(sk)->dccpms_send_ack_vector &&
+			    dccp_ackvec_parse(sk, skb, opt, value, len))
+				goto out_invalid_option;
 			break;
 		case DCCPO_TIMESTAMP:
 			if (len != 4)
 				goto out_invalid_option;
 
-			opt_recv->dccpor_timestamp = ntohl(*(u32 *)value);
+			opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value);
 
 			dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
 			dccp_timestamp(sk, &dp->dccps_timestamp_time);
@@ -151,7 +172,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 			if (len != 4 && len != 6 && len != 8)
 				goto out_invalid_option;
 
-			opt_recv->dccpor_timestamp_echo = ntohl(*(u32 *)value);
+			opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value);
 
 			dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ",
 				      debug_prefix,
@@ -165,9 +186,9 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 				break;
 
 			if (len == 6)
-				elapsed_time = ntohs(*(u16 *)(value + 4));
+				elapsed_time = ntohs(*(__be16 *)(value + 4));
 			else
-				elapsed_time = ntohl(*(u32 *)(value + 4));
+				elapsed_time = ntohl(*(__be32 *)(value + 4));
 
 			/* Give precedence to the biggest ELAPSED_TIME */
 			if (elapsed_time > opt_recv->dccpor_elapsed_time)
@@ -181,9 +202,9 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 				continue;
 
 			if (len == 2)
-				elapsed_time = ntohs(*(u16 *)value);
+				elapsed_time = ntohs(*(__be16 *)value);
 			else
-				elapsed_time = ntohl(*(u32 *)value);
+				elapsed_time = ntohl(*(__be32 *)value);
 
 			if (elapsed_time > opt_recv->dccpor_elapsed_time)
 				opt_recv->dccpor_elapsed_time = elapsed_time;
@@ -224,8 +245,15 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
 				sk, opt, len);
 			break;
 	        }
+
+		if (opt != DCCPO_MANDATORY)
+			mandatory = 0;
 	}
 
+	/* mandatory was the last byte in option list -> reset connection */
+	if (mandatory)
+		goto out_invalid_option;
+
 	return 0;
 
 out_invalid_option:
@@ -235,6 +263,8 @@ out_invalid_option:
 	return -1;
 }
 
+EXPORT_SYMBOL_GPL(dccp_parse_options);
+
 static void dccp_encode_value_var(const u32 value, unsigned char *to,
 				  const unsigned int len)
 {
@@ -253,17 +283,14 @@ static inline int dccp_ndp_len(const int ndp)
 	return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3;
 }
 
-void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
+int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
 			const unsigned char option,
 			const void *value, const unsigned char len)
 {
 	unsigned char *to;
 
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) {
-		LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
-			       "%d option!\n", option);
-		return;
-	}
+	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
+		return -1;
 
 	DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
 
@@ -272,11 +299,12 @@ void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
 	*to++ = len + 2;
 
 	memcpy(to, value, len);
+	return 0;
 }
 
 EXPORT_SYMBOL_GPL(dccp_insert_option);
 
-static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
+static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	int ndp = dp->dccps_ndp_count;
@@ -292,7 +320,7 @@ static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
 		const int len = ndp_len + 2;
 
 		if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
-			return;
+			return -1;
 
 		DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 
@@ -301,6 +329,8 @@ static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
 		*ptr++ = len;
 		dccp_encode_value_var(ndp, ptr, ndp_len);
 	}
+
+	return 0;
 }
 
 static inline int dccp_elapsed_time_len(const u32 elapsed_time)
@@ -308,27 +338,18 @@ static inline int dccp_elapsed_time_len(const u32 elapsed_time)
 	return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
 }
 
-void dccp_insert_option_elapsed_time(struct sock *sk,
-				     struct sk_buff *skb,
-				     u32 elapsed_time)
+int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
+				    u32 elapsed_time)
 {
-#ifdef CONFIG_IP_DCCP_DEBUG
-	struct dccp_sock *dp = dccp_sk(sk);
-	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
-					"CLIENT TX opt: " : "server TX opt: ";
-#endif
 	const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
 	const int len = 2 + elapsed_time_len;
 	unsigned char *to;
 
 	if (elapsed_time_len == 0)
-		return;
+		return 0;
 
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
-		LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to "
-					 "insert elapsed time!\n");
-		return;
-	}
+	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+		return -1;
 
 	DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 
@@ -337,101 +358,18 @@ void dccp_insert_option_elapsed_time(struct sock *sk,
 	*to++ = len;
 
 	if (elapsed_time_len == 2) {
-		const u16 var16 = htons((u16)elapsed_time);
+		const __be16 var16 = htons((u16)elapsed_time);
 		memcpy(to, &var16, 2);
 	} else {
-		const u32 var32 = htonl(elapsed_time);
+		const __be32 var32 = htonl(elapsed_time);
 		memcpy(to, &var32, 4);
 	}
 
-	dccp_pr_debug("%sELAPSED_TIME=%u, len=%d, seqno=%llu\n",
-		      debug_prefix, elapsed_time,
-		      len,
-		      (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
+	return 0;
 }
 
 EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
 
-static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
-{
-	struct dccp_sock *dp = dccp_sk(sk);
-#ifdef CONFIG_IP_DCCP_DEBUG
-	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
-					"CLIENT TX opt: " : "server TX opt: ";
-#endif
-	struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
-	int len = ap->dccpap_buf_vector_len + 2;
-	struct timeval now;
-	u32 elapsed_time;
-	unsigned char *to, *from;
-
-	dccp_timestamp(sk, &now);
-	elapsed_time = timeval_delta(&now, &ap->dccpap_time) / 10;
-
-	if (elapsed_time != 0)
-		dccp_insert_option_elapsed_time(sk, skb, elapsed_time);
-
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
-		LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to "
-					 "insert ACK Vector!\n");
-		return;
-	}
-
-	/*
-	 * XXX: now we have just one ack vector sent record, so
-	 * we have to wait for it to be cleared.
-	 *
-	 * Of course this is not acceptable, but this is just for
-	 * basic testing now.
-	 */
-	if (ap->dccpap_ack_seqno != DCCP_MAX_SEQNO + 1)
-		return;
-
-	DCCP_SKB_CB(skb)->dccpd_opt_len += len;
-
-	to    = skb_push(skb, len);
-	*to++ = DCCPO_ACK_VECTOR_0;
-	*to++ = len;
-
-	len  = ap->dccpap_buf_vector_len;
-	from = ap->dccpap_buf + ap->dccpap_buf_head;
-
-	/* Check if buf_head wraps */
-	if (ap->dccpap_buf_head + len > ap->dccpap_buf_len) {
-		const unsigned int tailsize = (ap->dccpap_buf_len -
-					       ap->dccpap_buf_head);
-
-		memcpy(to, from, tailsize);
-		to   += tailsize;
-		len  -= tailsize;
-		from = ap->dccpap_buf;
-	}
-
-	memcpy(to, from, len);
-	/*
-	 *	From draft-ietf-dccp-spec-11.txt:
-	 *
-	 *	For each acknowledgement it sends, the HC-Receiver will add an
-	 *	acknowledgement record.  ack_seqno will equal the HC-Receiver
-	 *	sequence number it used for the ack packet; ack_ptr will equal
-	 *	buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
-	 *	equal buf_nonce.
-	 *
-	 * This implemention uses just one ack record for now.
-	 */
-	ap->dccpap_ack_seqno	  = DCCP_SKB_CB(skb)->dccpd_seq;
-	ap->dccpap_ack_ptr	  = ap->dccpap_buf_head;
-	ap->dccpap_ack_ackno	  = ap->dccpap_buf_ackno;
-	ap->dccpap_ack_nonce	  = ap->dccpap_buf_nonce;
-	ap->dccpap_ack_vector_len = ap->dccpap_buf_vector_len;
-
-	dccp_pr_debug("%sACK Vector 0, len=%d, ack_seqno=%llu, "
-		      "ack_ackno=%llu\n",
-		      debug_prefix, ap->dccpap_ack_vector_len,
-		      (unsigned long long) ap->dccpap_ack_seqno,
-		      (unsigned long long) ap->dccpap_ack_ackno);
-}
-
 void dccp_timestamp(const struct sock *sk, struct timeval *tv)
 {
 	const struct dccp_sock *dp = dccp_sk(sk);
@@ -448,32 +386,27 @@ void dccp_timestamp(const struct sock *sk, struct timeval *tv)
 
 EXPORT_SYMBOL_GPL(dccp_timestamp);
 
-void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
+int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
 {
 	struct timeval tv;
-	u32 now;
-	
+	__be32 now;
+
 	dccp_timestamp(sk, &tv);
-	now = timeval_usecs(&tv) / 10;
+	now = htonl(timeval_usecs(&tv) / 10);
 	/* yes this will overflow but that is the point as we want a
 	 * 10 usec 32 bit timer which mean it wraps every 11.9 hours */
 
-	now = htonl(now);
-	dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
+	return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
 }
 
 EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
 
-static void dccp_insert_option_timestamp_echo(struct sock *sk,
-					      struct sk_buff *skb)
+static int dccp_insert_option_timestamp_echo(struct sock *sk,
+					     struct sk_buff *skb)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
-#ifdef CONFIG_IP_DCCP_DEBUG
-	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
-					"CLIENT TX opt: " : "server TX opt: ";
-#endif
 	struct timeval now;
-	u32 tstamp_echo;
+	__be32 tstamp_echo;
 	u32 elapsed_time;
 	int len, elapsed_time_len;
 	unsigned char *to;
@@ -483,11 +416,8 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
 	elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
 	len = 6 + elapsed_time_len;
 
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
-		LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
-					 "timestamp echo!\n");
-		return;
-	}
+	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+		return -1;
 
 	DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 
@@ -498,390 +428,161 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
 	tstamp_echo = htonl(dp->dccps_timestamp_echo);
 	memcpy(to, &tstamp_echo, 4);
 	to += 4;
-	
+
 	if (elapsed_time_len == 2) {
-		const u16 var16 = htons((u16)elapsed_time);
+		const __be16 var16 = htons((u16)elapsed_time);
 		memcpy(to, &var16, 2);
 	} else if (elapsed_time_len == 4) {
-		const u32 var32 = htonl(elapsed_time);
+		const __be32 var32 = htonl(elapsed_time);
 		memcpy(to, &var32, 4);
 	}
 
-	dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, seqno=%llu\n",
-		      debug_prefix, dp->dccps_timestamp_echo,
-		      len,
-		      (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
-
 	dp->dccps_timestamp_echo = 0;
 	dp->dccps_timestamp_time.tv_sec = 0;
 	dp->dccps_timestamp_time.tv_usec = 0;
+	return 0;
 }
 
-void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
+static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
+			        u8 *val, u8 len)
 {
-	struct dccp_sock *dp = dccp_sk(sk);
-
-	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
-
-	if (dp->dccps_options.dccpo_send_ndp_count)
-		dccp_insert_option_ndp(sk, skb);
+	u8 *to;
 
-	if (!dccp_packet_without_ack(skb)) {
-		if (dp->dccps_options.dccpo_send_ack_vector &&
-		    (dp->dccps_hc_rx_ackpkts->dccpap_buf_ackno !=
-		     DCCP_MAX_SEQNO + 1))
-			dccp_insert_option_ack_vector(sk, skb);
-		if (dp->dccps_timestamp_echo != 0)
-			dccp_insert_option_timestamp_echo(sk, skb);
+	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
+		LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small"
+			       " to insert feature %d option!\n", feat);
+		return -1;
 	}
 
-	if (dp->dccps_hc_rx_insert_options) {
-		ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb);
-		dp->dccps_hc_rx_insert_options = 0;
-	}
-	if (dp->dccps_hc_tx_insert_options) {
-		ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb);
-		dp->dccps_hc_tx_insert_options = 0;
-	}
-
-	/* XXX: insert other options when appropriate */
-
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {
-		/* The length of all options has to be a multiple of 4 */
-		int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
-
-		if (padding != 0) {
-			padding = 4 - padding;
-			memset(skb_push(skb, padding), 0, padding);
-			DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
-		}
-	}
-}
+	DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
 
-struct dccp_ackpkts *dccp_ackpkts_alloc(const unsigned int len,
-				        const unsigned int __nocast priority)
-{
-	struct dccp_ackpkts *ap = kmalloc(sizeof(*ap) + len, priority);
+	to    = skb_push(skb, len + 3);
+	*to++ = type;
+	*to++ = len + 3;
+	*to++ = feat;
 
-	if (ap != NULL) {
-#ifdef CONFIG_IP_DCCP_DEBUG
-		memset(ap->dccpap_buf, 0xFF, len);
-#endif
-		ap->dccpap_buf_len   = len;
-		ap->dccpap_buf_head  =
-			ap->dccpap_buf_tail =
-				ap->dccpap_buf_len - 1;
-		ap->dccpap_buf_ackno =
-			ap->dccpap_ack_ackno =
-				ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
-		ap->dccpap_buf_nonce = ap->dccpap_buf_nonce = 0;
-		ap->dccpap_ack_ptr   = 0;
-		ap->dccpap_time.tv_sec = 0;
-		ap->dccpap_time.tv_usec = 0;
-		ap->dccpap_buf_vector_len = ap->dccpap_ack_vector_len = 0;
-	}
+	if (len)
+		memcpy(to, val, len);
+	dccp_pr_debug("option %d feat %d len %d\n", type, feat, len);
 
-	return ap;
+	return 0;
 }
 
-void dccp_ackpkts_free(struct dccp_ackpkts *ap)
+static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
 {
-	if (ap != NULL) {
-#ifdef CONFIG_IP_DCCP_DEBUG
-		memset(ap, 0xFF, sizeof(*ap) + ap->dccpap_buf_len);
-#endif
-		kfree(ap);
+	struct dccp_sock *dp = dccp_sk(sk);
+	struct dccp_minisock *dmsk = dccp_msk(sk);
+	struct dccp_opt_pend *opt, *next;
+	int change = 0;
+
+	/* confirm any options [NN opts] */
+	list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
+		dccp_insert_feat_opt(skb, opt->dccpop_type,
+				     opt->dccpop_feat, opt->dccpop_val,
+				     opt->dccpop_len);
+		/* fear empty confirms */
+		if (opt->dccpop_val)
+			kfree(opt->dccpop_val);
+		kfree(opt);
 	}
-}
-
-static inline u8 dccp_ackpkts_state(const struct dccp_ackpkts *ap,
-				    const unsigned int index)
-{
-	return ap->dccpap_buf[index] & DCCP_ACKPKTS_STATE_MASK;
-}
-
-static inline u8 dccp_ackpkts_len(const struct dccp_ackpkts *ap,
-				  const unsigned int index)
-{
-	return ap->dccpap_buf[index] & DCCP_ACKPKTS_LEN_MASK;
-}
-
-/*
- * If several packets are missing, the HC-Receiver may prefer to enter multiple
- * bytes with run length 0, rather than a single byte with a larger run length;
- * this simplifies table updates if one of the missing packets arrives.
- */
-static inline int dccp_ackpkts_set_buf_head_state(struct dccp_ackpkts *ap,
-						  const unsigned int packets,
-						  const unsigned char state)
-{
-	unsigned int gap;
-	signed long new_head;
-
-	if (ap->dccpap_buf_vector_len + packets > ap->dccpap_buf_len)
-		return -ENOBUFS;
-
-	gap	 = packets - 1;
-	new_head = ap->dccpap_buf_head - packets;
-
-	if (new_head < 0) {
-		if (gap > 0) {
-			memset(ap->dccpap_buf, DCCP_ACKPKTS_STATE_NOT_RECEIVED,
-			       gap + new_head + 1);
-			gap = -new_head;
+	INIT_LIST_HEAD(&dmsk->dccpms_conf);
+
+	/* see which features we need to send */
+	list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
+		/* see if we need to send any confirm */
+		if (opt->dccpop_sc) {
+			dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
+					     opt->dccpop_feat,
+					     opt->dccpop_sc->dccpoc_val,
+					     opt->dccpop_sc->dccpoc_len);
+
+			BUG_ON(!opt->dccpop_sc->dccpoc_val);
+			kfree(opt->dccpop_sc->dccpoc_val);
+			kfree(opt->dccpop_sc);
+			opt->dccpop_sc = NULL;
 		}
-		new_head += ap->dccpap_buf_len;
-	} 
-
-	ap->dccpap_buf_head = new_head;
 
-	if (gap > 0)
-		memset(ap->dccpap_buf + ap->dccpap_buf_head + 1,
-		       DCCP_ACKPKTS_STATE_NOT_RECEIVED, gap);
-
-	ap->dccpap_buf[ap->dccpap_buf_head] = state;
-	ap->dccpap_buf_vector_len += packets;
-	return 0;
-}
+		/* any option not confirmed, re-send it */
+		if (!opt->dccpop_conf) {
+			dccp_insert_feat_opt(skb, opt->dccpop_type,
+					     opt->dccpop_feat, opt->dccpop_val,
+					     opt->dccpop_len);
+			change++;
+		}
+	}
 
-/*
- * Implements the draft-ietf-dccp-spec-11.txt Appendix A
- */
-int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
-		     u64 ackno, u8 state)
-{
-	/*
-	 * Check at the right places if the buffer is full, if it is, tell the
-	 * caller to start dropping packets till the HC-Sender acks our ACK
-	 * vectors, when we will free up space in dccpap_buf.
-	 *
-	 * We may well decide to do buffer compression, etc, but for now lets
-	 * just drop.
-	 *
-	 * From Appendix A:
-	 *
-	 *	Of course, the circular buffer may overflow, either when the
-	 *	HC-Sender is sending data at a very high rate, when the
-	 *	HC-Receiver's acknowledgements are not reaching the HC-Sender,
-	 *	or when the HC-Sender is forgetting to acknowledge those acks
-	 *	(so the HC-Receiver is unable to clean up old state). In this
-	 *	case, the HC-Receiver should either compress the buffer (by
-	 *	increasing run lengths when possible), transfer its state to
-	 *	a larger buffer, or, as a last resort, drop all received
-	 *	packets, without processing them whatsoever, until its buffer
-	 *	shrinks again.
+	/* Retransmit timer.
+	 * If this is the master listening sock, we don't set a timer on it.  It
+	 * should be fine because if the dude doesn't receive our RESPONSE
+	 * [which will contain the CHANGE] he will send another REQUEST which
+	 * will "retrnasmit" the change.
 	 */
+	if (change && dp->dccps_role != DCCP_ROLE_LISTEN) {
+		dccp_pr_debug("reset feat negotiation timer %p\n", sk);
 
-	/* See if this is the first ackno being inserted */
-	if (ap->dccpap_buf_vector_len == 0) {
-		ap->dccpap_buf[ap->dccpap_buf_head] = state;
-		ap->dccpap_buf_vector_len = 1;
-	} else if (after48(ackno, ap->dccpap_buf_ackno)) {
-		const u64 delta = dccp_delta_seqno(ap->dccpap_buf_ackno,
-						   ackno);
-
-		/*
-		 * Look if the state of this packet is the same as the
-		 * previous ackno and if so if we can bump the head len.
+		/* XXX don't reset the timer on re-transmissions.  I.e. reset it
+		 * only when sending new stuff i guess.  Currently the timer
+		 * never backs off because on re-transmission it just resets it!
 		 */
-		if (delta == 1 &&
-		    dccp_ackpkts_state(ap, ap->dccpap_buf_head) == state &&
-		    (dccp_ackpkts_len(ap, ap->dccpap_buf_head) <
-		     DCCP_ACKPKTS_LEN_MASK))
-			ap->dccpap_buf[ap->dccpap_buf_head]++;
-		else if (dccp_ackpkts_set_buf_head_state(ap, delta, state))
-			return -ENOBUFS;
-	} else {
-		/*
-		 * A.1.2.  Old Packets
-		 *
-		 *	When a packet with Sequence Number S arrives, and
-		 *	S <= buf_ackno, the HC-Receiver will scan the table
-		 *	for the byte corresponding to S. (Indexing structures
-		 *	could reduce the complexity of this scan.)
-		 */
-		u64 delta = dccp_delta_seqno(ackno, ap->dccpap_buf_ackno);
-		unsigned int index = ap->dccpap_buf_head;
-
-		while (1) {
-			const u8 len = dccp_ackpkts_len(ap, index);
-			const u8 state = dccp_ackpkts_state(ap, index);
-			/*
-			 * valid packets not yet in dccpap_buf have a reserved
-			 * entry, with a len equal to 0.
-			 */
-			if (state == DCCP_ACKPKTS_STATE_NOT_RECEIVED &&
-			    len == 0 && delta == 0) { /* Found our
-							 reserved seat! */
-				dccp_pr_debug("Found %llu reserved seat!\n",
-					      (unsigned long long) ackno);
-				ap->dccpap_buf[index] = state;
-				goto out;
-			}
-			/* len == 0 means one packet */
-			if (delta < len + 1)
-				goto out_duplicate;
-
-			delta -= len + 1;
-			if (++index == ap->dccpap_buf_len)
-				index = 0;
-		}
+		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+					  inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
 	}
 
-	ap->dccpap_buf_ackno = ackno;
-	dccp_timestamp(sk, &ap->dccpap_time);
-out:
-	dccp_pr_debug("");
-	dccp_ackpkts_print(ap);
 	return 0;
-
-out_duplicate:
-	/* Duplicate packet */
-	dccp_pr_debug("Received a dup or already considered lost "
-		      "packet: %llu\n", (unsigned long long) ackno);
-	return -EILSEQ;
 }
 
-#ifdef CONFIG_IP_DCCP_DEBUG
-void dccp_ackvector_print(const u64 ackno, const unsigned char *vector,
-			  int len)
+int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
 {
-	if (!dccp_debug)
-		return;
+	struct dccp_sock *dp = dccp_sk(sk);
+	struct dccp_minisock *dmsk = dccp_msk(sk);
 
-	printk("ACK vector len=%d, ackno=%llu |", len,
-	       (unsigned long long) ackno);
+	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 
-	while (len--) {
-		const u8 state = (*vector & DCCP_ACKPKTS_STATE_MASK) >> 6;
-		const u8 rl = (*vector & DCCP_ACKPKTS_LEN_MASK);
+	if (dmsk->dccpms_send_ndp_count &&
+	    dccp_insert_option_ndp(sk, skb))
+		return -1;
 
-		printk("%d,%d|", state, rl);
-		++vector;
+	if (!dccp_packet_without_ack(skb)) {
+		if (dmsk->dccpms_send_ack_vector &&
+		    dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
+		    dccp_insert_option_ackvec(sk, skb))
+			return -1;
+
+		if (dp->dccps_timestamp_echo != 0 &&
+		    dccp_insert_option_timestamp_echo(sk, skb))
+			return -1;
 	}
 
-	printk("\n");
-}
-
-void dccp_ackpkts_print(const struct dccp_ackpkts *ap)
-{
-	dccp_ackvector_print(ap->dccpap_buf_ackno,
-			     ap->dccpap_buf + ap->dccpap_buf_head,
-			     ap->dccpap_buf_vector_len);
-}
-#endif
-
-static void dccp_ackpkts_trow_away_ack_record(struct dccp_ackpkts *ap)
-{
-	/*
-	 * As we're keeping track of the ack vector size
-	 * (dccpap_buf_vector_len) and the sent ack vector size
-	 * (dccpap_ack_vector_len) we don't need dccpap_buf_tail at all, but
-	 * keep this code here as in the future we'll implement a vector of
-	 * ack records, as suggested in draft-ietf-dccp-spec-11.txt
-	 * Appendix A. -acme
-	 */
-#if 0
-	ap->dccpap_buf_tail = ap->dccpap_ack_ptr + 1;
-	if (ap->dccpap_buf_tail >= ap->dccpap_buf_len)
-		ap->dccpap_buf_tail -= ap->dccpap_buf_len;
-#endif
-	ap->dccpap_buf_vector_len -= ap->dccpap_ack_vector_len;
-}
-
-void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap, struct sock *sk,
-				 u64 ackno)
-{
-	/* Check if we actually sent an ACK vector */
-	if (ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1)
-		return;
-
-	if (ackno == ap->dccpap_ack_seqno) {
-#ifdef CONFIG_IP_DCCP_DEBUG
-		struct dccp_sock *dp = dccp_sk(sk);
-		const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
-					"CLIENT rx ack: " : "server rx ack: ";
-#endif
-		dccp_pr_debug("%sACK packet 0, len=%d, ack_seqno=%llu, "
-			      "ack_ackno=%llu, ACKED!\n",
-			      debug_prefix, 1,
-			      (unsigned long long) ap->dccpap_ack_seqno,
-			      (unsigned long long) ap->dccpap_ack_ackno);
-		dccp_ackpkts_trow_away_ack_record(ap);
-		ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
+	if (dp->dccps_hc_rx_insert_options) {
+		if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
+			return -1;
+		dp->dccps_hc_rx_insert_options = 0;
 	}
-}
-
-static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap,
-					     struct sock *sk, u64 ackno,
-					     const unsigned char len,
-					     const unsigned char *vector)
-{
-	unsigned char i;
-
-	/* Check if we actually sent an ACK vector */
-	if (ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1)
-		return;
-	/*
-	 * We're in the receiver half connection, so if the received an ACK
-	 * vector ackno (e.g. 50) before dccpap_ack_seqno (e.g. 52), we're
-	 * not interested.
-	 *
-	 * Extra explanation with example:
-	 * 
-	 * if we received an ACK vector with ackno 50, it can only be acking
-	 * 50, 49, 48, etc, not 52 (the seqno for the ACK vector we sent).
-	 */
-	/* dccp_pr_debug("is %llu < %llu? ", ackno, ap->dccpap_ack_seqno); */
-	if (before48(ackno, ap->dccpap_ack_seqno)) {
-		/* dccp_pr_debug_cat("yes\n"); */
-		return;
+	if (dp->dccps_hc_tx_insert_options) {
+		if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb))
+			return -1;
+		dp->dccps_hc_tx_insert_options = 0;
 	}
-	/* dccp_pr_debug_cat("no\n"); */
 
-	i = len;
-	while (i--) {
-		const u8 rl = (*vector & DCCP_ACKPKTS_LEN_MASK);
-		u64 ackno_end_rl;
+	/* Feature negotiation */
+	/* Data packets can't do feat negotiation */
+	if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
+	    DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
+	    dccp_insert_options_feat(sk, skb))
+		return -1;
 
-		dccp_set_seqno(&ackno_end_rl, ackno - rl);
+	/* XXX: insert other options when appropriate */
 
-		/*
-		 * dccp_pr_debug("is %llu <= %llu <= %llu? ", ackno_end_rl,
-		 * ap->dccpap_ack_seqno, ackno);
-		 */
-		if (between48(ap->dccpap_ack_seqno, ackno_end_rl, ackno)) {
-			const u8 state = (*vector &
-					  DCCP_ACKPKTS_STATE_MASK) >> 6;
-			/* dccp_pr_debug_cat("yes\n"); */
+	if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {
+		/* The length of all options has to be a multiple of 4 */
+		int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
 
-			if (state != DCCP_ACKPKTS_STATE_NOT_RECEIVED) {
-#ifdef CONFIG_IP_DCCP_DEBUG
-				struct dccp_sock *dp = dccp_sk(sk);
-				const char *debug_prefix =
-					dp->dccps_role == DCCP_ROLE_CLIENT ?
-					"CLIENT rx ack: " : "server rx ack: ";
-#endif
-				dccp_pr_debug("%sACK vector 0, len=%d, "
-					      "ack_seqno=%llu, ack_ackno=%llu, "
-					      "ACKED!\n",
-					      debug_prefix, len,
-					      (unsigned long long)
-					      ap->dccpap_ack_seqno,
-					      (unsigned long long)
-					      ap->dccpap_ack_ackno);
-				dccp_ackpkts_trow_away_ack_record(ap);
-			}
-			/*
-			 * If dccpap_ack_seqno was not received, no problem
-			 * we'll send another ACK vector.
-			 */
-			ap->dccpap_ack_seqno = DCCP_MAX_SEQNO + 1;
-			break;
+		if (padding != 0) {
+			padding = 4 - padding;
+			memset(skb_push(skb, padding), 0, padding);
+			DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
 		}
-		/* dccp_pr_debug_cat("no\n"); */
-
-		dccp_set_seqno(&ackno, ackno_end_rl - 1);
-		++vector;
 	}
+
+	return 0;
 }