[deliverable/linux.git] / net / dccp / options.c

/*
 *  net/dccp/options.c
 *
 *  An implementation of the DCCP protocol
 *  Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
 *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#include <linux/dccp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>

#include "ackvec.h"
#include "ccid.h"
#include "dccp.h"
#include "feat.h"

int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
int sysctl_dccp_feat_rx_ccid	      = DCCPF_INITIAL_CCID;
int sysctl_dccp_feat_tx_ccid	      = DCCPF_INITIAL_CCID;
int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
int sysctl_dccp_feat_send_ndp_count  = DCCPF_INITIAL_SEND_NDP_COUNT;

static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
{
	u32 value = 0;

	if (len > 3)
		value += *bf++ << 24;
	if (len > 2)
		value += *bf++ << 16;
	if (len > 1)
		value += *bf++ << 8;
	if (len > 0)
		value += *bf;

	return value;
}

/**
 * dccp_parse_options  -  Parse DCCP options present in @skb
 * @sk: client|server|listening dccp socket (when @dreq != NULL)
 * @dreq: request socket to use during connection setup, or NULL
 */
int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
		       struct sk_buff *skb)
{
	struct dccp_sock *dp = dccp_sk(sk);
	const struct dccp_hdr *dh = dccp_hdr(skb);
	const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
	u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
	unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
	unsigned char *opt_ptr = options;
	const unsigned char *opt_end = (unsigned char *)dh +
					(dh->dccph_doff * 4);
	struct dccp_options_received *opt_recv = &dp->dccps_options_received;
	unsigned char opt, len;
	unsigned char *value;
	u32 elapsed_time;
	__be32 opt_val;
	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;
		value = NULL;

		/* Check if this isn't a single byte option */
		if (opt > DCCPO_MAX_RESERVED) {
			if (opt_ptr == opt_end)
				goto out_nonsensical_length;

			len = *opt_ptr++;
			if (len < 2)
				goto out_nonsensical_length;
			/*
			 * Remove the type and len fields, leaving
			 * just the value size
			 */
			len	-= 2;
			value	= opt_ptr;
			opt_ptr += len;

			if (opt_ptr > opt_end)
				goto out_nonsensical_length;
		}

		/*
		 * CCID-Specific Options (from RFC 4340, sec. 10.3):
		 *
		 * Option numbers 128 through 191 are for options sent from the
		 * HC-Sender to the HC-Receiver; option numbers 192 through 255
		 * are for options sent from the HC-Receiver to	the HC-Sender.
		 *
		 * CCID-specific options are ignored during connection setup, as
		 * negotiation may still be in progress (see RFC 4340, 10.3).
		 * The same applies to Ack Vectors, as these depend on the CCID.
		 *
		 */
		if (dreq != NULL && (opt >= 128 ||
		    opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
			goto ignore_option;

		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 > 6)
				goto out_invalid_option;

			opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
			dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
				      (unsigned long long)opt_recv->dccpor_ndp);
			break;
		case DCCPO_CHANGE_L:
			/* fall through */
		case DCCPO_CHANGE_R:
			if (pkt_type == DCCP_PKT_DATA)
				break;
			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 (pkt_type == DCCP_PKT_DATA)
				break;
			if (len < 2)	/* FIXME this disallows empty confirm */
				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 (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
				break;

			if (dccp_msk(sk)->dccpms_send_ack_vector &&
			    dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
				goto out_invalid_option;
			break;
		case DCCPO_TIMESTAMP:
			if (len != 4)
				goto out_invalid_option;
			/*
			 * RFC 4340 13.1: "The precise time corresponding to
			 * Timestamp Value zero is not specified". We use
			 * zero to indicate absence of a meaningful timestamp.
			 */
			opt_val = get_unaligned((__be32 *)value);
			if (unlikely(opt_val == 0)) {
				DCCP_WARN("Timestamp with zero value\n");
				break;
			}

			if (dreq != NULL) {
				dreq->dreq_timestamp_echo = ntohl(opt_val);
				dreq->dreq_timestamp_time = dccp_timestamp();
			} else {
				opt_recv->dccpor_timestamp =
					dp->dccps_timestamp_echo = ntohl(opt_val);
				dp->dccps_timestamp_time = dccp_timestamp();
			}
			dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
				      dccp_role(sk), ntohl(opt_val),
				      (unsigned long long)
				      DCCP_SKB_CB(skb)->dccpd_ack_seq);
			break;
		case DCCPO_TIMESTAMP_ECHO:
			if (len != 4 && len != 6 && len != 8)
				goto out_invalid_option;

			opt_val = get_unaligned((__be32 *)value);
			opt_recv->dccpor_timestamp_echo = ntohl(opt_val);

			dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
				      "ackno=%llu", dccp_role(sk),
				      opt_recv->dccpor_timestamp_echo,
				      len + 2,
				      (unsigned long long)
				      DCCP_SKB_CB(skb)->dccpd_ack_seq);

			value += 4;

			if (len == 4) {		/* no elapsed time included */
				dccp_pr_debug_cat("\n");
				break;
			}

			if (len == 6) {		/* 2-byte elapsed time */
				__be16 opt_val2 = get_unaligned((__be16 *)value);
				elapsed_time = ntohs(opt_val2);
			} else {		/* 4-byte elapsed time */
				opt_val = get_unaligned((__be32 *)value);
				elapsed_time = ntohl(opt_val);
			}

			dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);

			/* Give precedence to the biggest ELAPSED_TIME */
			if (elapsed_time > opt_recv->dccpor_elapsed_time)
				opt_recv->dccpor_elapsed_time = elapsed_time;
			break;
		case DCCPO_ELAPSED_TIME:
			if (dccp_packet_without_ack(skb))   /* RFC 4340, 13.2 */
				break;

			if (len == 2) {
				__be16 opt_val2 = get_unaligned((__be16 *)value);
				elapsed_time = ntohs(opt_val2);
			} else if (len == 4) {
				opt_val = get_unaligned((__be32 *)value);
				elapsed_time = ntohl(opt_val);
			} else {
				goto out_invalid_option;
			}

			if (elapsed_time > opt_recv->dccpor_elapsed_time)
				opt_recv->dccpor_elapsed_time = elapsed_time;

			dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
				      dccp_role(sk), elapsed_time);
			break;
		case 128 ... 191: {
			const u16 idx = value - options;

			if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
						     opt, len, idx,
						     value) != 0)
				goto out_invalid_option;
		}
			break;
		case 192 ... 255: {
			const u16 idx = value - options;

			if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
						     opt, len, idx,
						     value) != 0)
				goto out_invalid_option;
		}
			break;
		default:
			DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
				  "implemented, ignoring", sk, opt, len);
			break;
		}
ignore_option:
		if (opt != DCCPO_MANDATORY)
			mandatory = 0;
	}

	/* mandatory was the last byte in option list -> reset connection */
	if (mandatory)
		goto out_invalid_option;

out_nonsensical_length:
	/* RFC 4340, 5.8: ignore option and all remaining option space */
	return 0;

out_invalid_option:
	DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
	DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
	DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
	DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
	DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
	DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
	return -1;
}

EXPORT_SYMBOL_GPL(dccp_parse_options);

static void dccp_encode_value_var(const u32 value, unsigned char *to,
				  const unsigned int len)
{
	if (len > 3)
		*to++ = (value & 0xFF000000) >> 24;
	if (len > 2)
		*to++ = (value & 0xFF0000) >> 16;
	if (len > 1)
		*to++ = (value & 0xFF00) >> 8;
	if (len > 0)
		*to++ = (value & 0xFF);
}

static inline u8 dccp_ndp_len(const u64 ndp)
{
	if (likely(ndp <= 0xFF))
		return 1;
	return likely(ndp <= USHORT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
}

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)
		return -1;

	DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;

	to    = skb_push(skb, len + 2);
	*to++ = option;
	*to++ = len + 2;

	memcpy(to, value, len);
	return 0;
}

EXPORT_SYMBOL_GPL(dccp_insert_option);

static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
{
	struct dccp_sock *dp = dccp_sk(sk);
	u64 ndp = dp->dccps_ndp_count;

	if (dccp_non_data_packet(skb))
		++dp->dccps_ndp_count;
	else
		dp->dccps_ndp_count = 0;

	if (ndp > 0) {
		unsigned char *ptr;
		const int ndp_len = dccp_ndp_len(ndp);
		const int len = ndp_len + 2;

		if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
			return -1;

		DCCP_SKB_CB(skb)->dccpd_opt_len += len;

		ptr = skb_push(skb, len);
		*ptr++ = DCCPO_NDP_COUNT;
		*ptr++ = len;
		dccp_encode_value_var(ndp, ptr, ndp_len);
	}

	return 0;
}

static inline int dccp_elapsed_time_len(const u32 elapsed_time)
{
	return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
}

int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
				    u32 elapsed_time)
{
	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 0;

	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
		return -1;

	DCCP_SKB_CB(skb)->dccpd_opt_len += len;

	to    = skb_push(skb, len);
	*to++ = DCCPO_ELAPSED_TIME;
	*to++ = len;

	if (elapsed_time_len == 2) {
		const __be16 var16 = htons((u16)elapsed_time);
		memcpy(to, &var16, 2);
	} else {
		const __be32 var32 = htonl(elapsed_time);
		memcpy(to, &var32, 4);
	}

	return 0;
}

EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);

int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
{
	__be32 now = htonl(dccp_timestamp());
	/* 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 */

	return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
}

EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);

static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
					     struct dccp_request_sock *dreq,
					     struct sk_buff *skb)
{
	__be32 tstamp_echo;
	unsigned char *to;
	u32 elapsed_time, elapsed_time_len, len;

	if (dreq != NULL) {
		elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time;
		tstamp_echo  = htonl(dreq->dreq_timestamp_echo);
		dreq->dreq_timestamp_echo = 0;
	} else {
		elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time;
		tstamp_echo  = htonl(dp->dccps_timestamp_echo);
		dp->dccps_timestamp_echo = 0;
	}

	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)
		return -1;

	DCCP_SKB_CB(skb)->dccpd_opt_len += len;

	to    = skb_push(skb, len);
	*to++ = DCCPO_TIMESTAMP_ECHO;
	*to++ = len;

	memcpy(to, &tstamp_echo, 4);
	to += 4;

	if (elapsed_time_len == 2) {
		const __be16 var16 = htons((u16)elapsed_time);
		memcpy(to, &var16, 2);
	} else if (elapsed_time_len == 4) {
		const __be32 var32 = htonl(elapsed_time);
		memcpy(to, &var32, 4);
	}

	return 0;
}

static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
				u8 *val, u8 len)
{
	u8 *to;

	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
		DCCP_WARN("packet too small for feature %d option!\n", feat);
		return -1;
	}

	DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;

	to    = skb_push(skb, len + 3);
	*to++ = type;
	*to++ = len + 3;
	*to++ = feat;

	if (len)
		memcpy(to, val, len);

	dccp_pr_debug("%s(%s (%d), ...), length %d\n",
		      dccp_feat_typename(type),
		      dccp_feat_name(feat), feat, len);
	return 0;
}

static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
{
	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);
	}
	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;
		}

		/* 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++;
		}
	}

	return 0;
}

/* The length of all options needs to be a multiple of 4 (5.8) */
static void dccp_insert_option_padding(struct sk_buff *skb)
{
	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;
	}
}

int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct dccp_minisock *dmsk = dccp_msk(sk);

	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;

	if (dmsk->dccpms_send_ndp_count &&
	    dccp_insert_option_ndp(sk, skb))
		return -1;

	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_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;
	}

	/* 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;

	/*
	 * Obtain RTT sample from Request/Response exchange.
	 * This is currently used in CCID 3 initialisation.
	 */
	if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
	    dccp_insert_option_timestamp(sk, skb))
		return -1;

	if (dp->dccps_timestamp_echo != 0 &&
	    dccp_insert_option_timestamp_echo(dp, NULL, skb))
		return -1;

	dccp_insert_option_padding(skb);
	return 0;
}

int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
{
	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;

	if (dreq->dreq_timestamp_echo != 0 &&
	    dccp_insert_option_timestamp_echo(NULL, dreq, skb))
		return -1;

	dccp_insert_option_padding(skb);
	return 0;
}
Commit	Line	Data
7c657876 ACM	1	/*
	2	* net/dccp/options.c
	3	*
	4	* An implementation of the DCCP protocol
1bc09869 IM	5	* Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
1bc09869 IM	6	* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
e6bccd35	7	* Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
7c657876 ACM	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*/
7c657876 ACM	14	#include <linux/dccp.h>
	15	#include <linux/module.h>
	16	#include <linux/types.h>
76fd1e87	17	#include <asm/unaligned.h>
7c657876 ACM	18	#include <linux/kernel.h>
	19	#include <linux/skbuff.h>
	20
ae31c339	21	#include "ackvec.h"
7c657876 ACM	22	#include "ccid.h"
7c657876 ACM	23	#include "dccp.h"
afe00251	24	#include "feat.h"
7c657876	25
410e27a4 GR	26	int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
	27	int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID;
	28	int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID;
410e27a4 GR	29	int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
	30	int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT;
	31
	32	static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
7c657876	33	{
410e27a4	34	u32 value = 0;
7c657876 ACM	35
7c657876 ACM	36	if (len > 3)
410e27a4	37	value += *bf++ << 24;
7c657876	38	if (len > 2)
410e27a4	39	value += *bf++ << 16;
7c657876	40	if (len > 1)
410e27a4	41	value += *bf++ << 8;
7c657876 ACM	42	if (len > 0)
	43	value += *bf;
	44
	45	return value;
	46	}
	47
8b819412 GR	48	/**
	49	* dccp_parse_options - Parse DCCP options present in @skb
	50	* @sk: client\|server\|listening dccp socket (when @dreq != NULL)
	51	* @dreq: request socket to use during connection setup, or NULL
	52	*/
	53	int dccp_parse_options(struct sock sk, struct dccp_request_sock dreq,
	54	struct sk_buff *skb)
7c657876 ACM	55	{
7c657876 ACM	56	struct dccp_sock *dp = dccp_sk(sk);
7c657876 ACM	57	const struct dccp_hdr *dh = dccp_hdr(skb);
7c657876 ACM	58	const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
410e27a4	59	u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
7c657876 ACM	60	unsigned char options = (unsigned char )dh + dccp_hdr_len(skb);
7c657876 ACM	61	unsigned char *opt_ptr = options;
7690af3f ACM	62	const unsigned char opt_end = (unsigned char )dh +
7690af3f ACM	63	(dh->dccph_doff * 4);
7c657876 ACM	64	struct dccp_options_received *opt_recv = &dp->dccps_options_received;
	65	unsigned char opt, len;
	66	unsigned char *value;
1c14ac0a	67	u32 elapsed_time;
76fd1e87	68	__be32 opt_val;
afe00251 AB	69	int rc;
afe00251 AB	70	int mandatory = 0;
7c657876 ACM	71
	72	memset(opt_recv, 0, sizeof(*opt_recv));
	73
fb950496	74	opt = len = 0;
7c657876 ACM	75	while (opt_ptr != opt_end) {
	76	opt = *opt_ptr++;
	77	len = 0;
	78	value = NULL;
	79
	80	/* Check if this isn't a single byte option */
	81	if (opt > DCCPO_MAX_RESERVED) {
	82	if (opt_ptr == opt_end)
faf61c33	83	goto out_nonsensical_length;
7c657876 ACM	84
7c657876 ACM	85	len = *opt_ptr++;
faf61c33 GR	86	if (len < 2)
faf61c33 GR	87	goto out_nonsensical_length;
7c657876 ACM	88	/*
	89	* Remove the type and len fields, leaving
	90	* just the value size
	91	*/
	92	len -= 2;
	93	value = opt_ptr;
	94	opt_ptr += len;
	95
	96	if (opt_ptr > opt_end)
faf61c33	97	goto out_nonsensical_length;
7c657876 ACM	98	}
7c657876 ACM	99
8b819412	100	/*
410e27a4 GR	101	* CCID-Specific Options (from RFC 4340, sec. 10.3):
	102	*
	103	* Option numbers 128 through 191 are for options sent from the
	104	* HC-Sender to the HC-Receiver; option numbers 192 through 255
	105	* are for options sent from the HC-Receiver to the HC-Sender.
	106	*
8b819412 GR	107	* CCID-specific options are ignored during connection setup, as
8b819412 GR	108	* negotiation may still be in progress (see RFC 4340, 10.3).
65907a43	109	* The same applies to Ack Vectors, as these depend on the CCID.
410e27a4	110	*
8b819412	111	*/
410e27a4	112	if (dreq != NULL && (opt >= 128 \|\|
65907a43	113	opt == DCCPO_ACK_VECTOR_0 \|\| opt == DCCPO_ACK_VECTOR_1))
8b819412 GR	114	goto ignore_option;
8b819412 GR	115
7c657876 ACM	116	switch (opt) {
	117	case DCCPO_PADDING:
	118	break;
afe00251 AB	119	case DCCPO_MANDATORY:
	120	if (mandatory)
	121	goto out_invalid_option;
6df9424a ACM	122	if (pkt_type != DCCP_PKT_DATA)
6df9424a ACM	123	mandatory = 1;
afe00251	124	break;
7c657876	125	case DCCPO_NDP_COUNT:
5b5d0e70	126	if (len > 6)
7c657876 ACM	127	goto out_invalid_option;
	128
	129	opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
5b5d0e70 GR	130	dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
5b5d0e70 GR	131	(unsigned long long)opt_recv->dccpor_ndp);
7c657876	132	break;
410e27a4 GR	133	case DCCPO_CHANGE_L:
	134	/* fall through */
	135	case DCCPO_CHANGE_R:
	136	if (pkt_type == DCCP_PKT_DATA)
cf86314c	137	break;
410e27a4 GR	138	if (len < 2)
	139	goto out_invalid_option;
	140	rc = dccp_feat_change_recv(sk, opt, *value, value + 1,
	141	len - 1);
	142	/*
	143	* When there is a change error, change_recv is
	144	* responsible for dealing with it. i.e. reply with an
	145	* empty confirm.
	146	* If the change was mandatory, then we need to die.
	147	*/
	148	if (rc && mandatory)
	149	goto out_invalid_option;
	150	break;
	151	case DCCPO_CONFIRM_L:
	152	/* fall through */
	153	case DCCPO_CONFIRM_R:
	154	if (pkt_type == DCCP_PKT_DATA)
	155	break;
	156	if (len < 2) /* FIXME this disallows empty confirm */
	157	goto out_invalid_option;
	158	if (dccp_feat_confirm_recv(sk, opt, *value,
	159	value + 1, len - 1))
	160	goto out_invalid_option;
	161	break;
	162	case DCCPO_ACK_VECTOR_0:
	163	case DCCPO_ACK_VECTOR_1:
	164	if (dccp_packet_without_ack(skb)) /* RFC 4340, 11.4 */
	165	break;
	166
	167	if (dccp_msk(sk)->dccpms_send_ack_vector &&
	168	dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
	169	goto out_invalid_option;
afe00251	170	break;
7c657876 ACM	171	case DCCPO_TIMESTAMP:
	172	if (len != 4)
	173	goto out_invalid_option;
b4d4f7c7 GR	174	/*
	175	* RFC 4340 13.1: "The precise time corresponding to
	176	* Timestamp Value zero is not specified". We use
	177	* zero to indicate absence of a meaningful timestamp.
	178	*/
76fd1e87	179	opt_val = get_unaligned((__be32 *)value);
b4d4f7c7 GR	180	if (unlikely(opt_val == 0)) {
	181	DCCP_WARN("Timestamp with zero value\n");
	182	break;
	183	}
7c657876	184
b4d4f7c7 GR	185	if (dreq != NULL) {
	186	dreq->dreq_timestamp_echo = ntohl(opt_val);
	187	dreq->dreq_timestamp_time = dccp_timestamp();
	188	} else {
	189	opt_recv->dccpor_timestamp =
	190	dp->dccps_timestamp_echo = ntohl(opt_val);
	191	dp->dccps_timestamp_time = dccp_timestamp();
	192	}
09dbc389	193	dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
b4d4f7c7	194	dccp_role(sk), ntohl(opt_val),
f6ccf554	195	(unsigned long long)
7c657876 ACM	196	DCCP_SKB_CB(skb)->dccpd_ack_seq);
	197	break;
	198	case DCCPO_TIMESTAMP_ECHO:
1bc09869	199	if (len != 4 && len != 6 && len != 8)
7c657876 ACM	200	goto out_invalid_option;
7c657876 ACM	201
76fd1e87 GR	202	opt_val = get_unaligned((__be32 *)value);
76fd1e87 GR	203	opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
7c657876	204
09dbc389	205	dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
f73f7097	206	"ackno=%llu", dccp_role(sk),
7690af3f	207	opt_recv->dccpor_timestamp_echo,
f6ccf554 DM	208	len + 2,
f6ccf554 DM	209	(unsigned long long)
1bc09869 IM	210	DCCP_SKB_CB(skb)->dccpd_ack_seq);
1bc09869 IM	211
76fd1e87	212	value += 4;
1bc09869	213
76fd1e87	214	if (len == 4) { /* no elapsed time included */
f73f7097	215	dccp_pr_debug_cat("\n");
1c14ac0a	216	break;
f73f7097	217	}
1c14ac0a	218
76fd1e87 GR	219	if (len == 6) { /* 2-byte elapsed time */
	220	__be16 opt_val2 = get_unaligned((__be16 *)value);
	221	elapsed_time = ntohs(opt_val2);
	222	} else { /* 4-byte elapsed time */
	223	opt_val = get_unaligned((__be32 *)value);
	224	elapsed_time = ntohl(opt_val);
	225	}
1c14ac0a	226
dcad856f	227	dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
f73f7097	228
1c14ac0a ACM	229	/* Give precedence to the biggest ELAPSED_TIME */
	230	if (elapsed_time > opt_recv->dccpor_elapsed_time)
	231	opt_recv->dccpor_elapsed_time = elapsed_time;
7c657876 ACM	232	break;
7c657876 ACM	233	case DCCPO_ELAPSED_TIME:
c86ab2b6 GR	234	if (dccp_packet_without_ack(skb)) /* RFC 4340, 13.2 */
c86ab2b6 GR	235	break;
1bc09869	236
76fd1e87 GR	237	if (len == 2) {
	238	__be16 opt_val2 = get_unaligned((__be16 *)value);
	239	elapsed_time = ntohs(opt_val2);
c86ab2b6	240	} else if (len == 4) {
76fd1e87 GR	241	opt_val = get_unaligned((__be32 *)value);
76fd1e87 GR	242	elapsed_time = ntohl(opt_val);
c86ab2b6 GR	243	} else {
c86ab2b6 GR	244	goto out_invalid_option;
76fd1e87	245	}
1c14ac0a ACM	246
	247	if (elapsed_time > opt_recv->dccpor_elapsed_time)
	248	opt_recv->dccpor_elapsed_time = elapsed_time;
1bc09869	249
09dbc389 GR	250	dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
09dbc389 GR	251	dccp_role(sk), elapsed_time);
7c657876	252	break;
410e27a4 GR	253	case 128 ... 191: {
	254	const u16 idx = value - options;
	255
7690af3f	256	if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
410e27a4 GR	257	opt, len, idx,
410e27a4 GR	258	value) != 0)
7c657876	259	goto out_invalid_option;
410e27a4	260	}
7c657876	261	break;
410e27a4 GR	262	case 192 ... 255: {
	263	const u16 idx = value - options;
	264
7690af3f	265	if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
410e27a4 GR	266	opt, len, idx,
410e27a4 GR	267	value) != 0)
7c657876	268	goto out_invalid_option;
410e27a4	269	}
7c657876 ACM	270	break;
7c657876 ACM	271	default:
59348b19 GR	272	DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
59348b19 GR	273	"implemented, ignoring", sk, opt, len);
7c657876	274	break;
c9eaf173	275	}
8b819412	276	ignore_option:
afe00251 AB	277	if (opt != DCCPO_MANDATORY)
afe00251 AB	278	mandatory = 0;
7c657876 ACM	279	}
7c657876 ACM	280
6df9424a ACM	281	/* mandatory was the last byte in option list -> reset connection */
	282	if (mandatory)
	283	goto out_invalid_option;
	284
faf61c33 GR	285	out_nonsensical_length:
faf61c33 GR	286	/* RFC 4340, 5.8: ignore option and all remaining option space */
7c657876 ACM	287	return 0;
	288
	289	out_invalid_option:
	290	DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
410e27a4 GR	291	DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
410e27a4 GR	292	DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
eac7726b GR	293	DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
	294	DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
	295	DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
7c657876 ACM	296	return -1;
	297	}
	298
b61fafc4 ACM	299	EXPORT_SYMBOL_GPL(dccp_parse_options);
b61fafc4 ACM	300
410e27a4 GR	301	static void dccp_encode_value_var(const u32 value, unsigned char *to,
410e27a4 GR	302	const unsigned int len)
7c657876 ACM	303	{
	304	if (len > 3)
	305	*to++ = (value & 0xFF000000) >> 24;
	306	if (len > 2)
	307	*to++ = (value & 0xFF0000) >> 16;
	308	if (len > 1)
	309	*to++ = (value & 0xFF00) >> 8;
	310	if (len > 0)
	311	*to++ = (value & 0xFF);
	312	}
	313
5b5d0e70	314	static inline u8 dccp_ndp_len(const u64 ndp)
7c657876	315	{
5b5d0e70 GR	316	if (likely(ndp <= 0xFF))
	317	return 1;
	318	return likely(ndp <= USHORT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
7c657876 ACM	319	}
7c657876 ACM	320
2d0817d1	321	int dccp_insert_option(struct sock sk, struct sk_buff skb,
7c657876 ACM	322	const unsigned char option,
	323	const void *value, const unsigned char len)
	324	{
	325	unsigned char *to;
	326
2d0817d1 ACM	327	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
2d0817d1 ACM	328	return -1;
7c657876 ACM	329
	330	DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
	331
	332	to = skb_push(skb, len + 2);
	333	*to++ = option;
	334	*to++ = len + 2;
	335
	336	memcpy(to, value, len);
2d0817d1	337	return 0;
7c657876 ACM	338	}
	339
	340	EXPORT_SYMBOL_GPL(dccp_insert_option);
	341
2d0817d1	342	static int dccp_insert_option_ndp(struct sock sk, struct sk_buff skb)
7c657876 ACM	343	{
7c657876 ACM	344	struct dccp_sock *dp = dccp_sk(sk);
5b5d0e70	345	u64 ndp = dp->dccps_ndp_count;
7c657876 ACM	346
	347	if (dccp_non_data_packet(skb))
	348	++dp->dccps_ndp_count;
	349	else
	350	dp->dccps_ndp_count = 0;
	351
	352	if (ndp > 0) {
	353	unsigned char *ptr;
	354	const int ndp_len = dccp_ndp_len(ndp);
	355	const int len = ndp_len + 2;
	356
	357	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
2d0817d1	358	return -1;
7c657876 ACM	359
	360	DCCP_SKB_CB(skb)->dccpd_opt_len += len;
	361
	362	ptr = skb_push(skb, len);
	363	*ptr++ = DCCPO_NDP_COUNT;
	364	*ptr++ = len;
	365	dccp_encode_value_var(ndp, ptr, ndp_len);
	366	}
2d0817d1 ACM	367
2d0817d1 ACM	368	return 0;
7c657876 ACM	369	}
	370
	371	static inline int dccp_elapsed_time_len(const u32 elapsed_time)
	372	{
b1c9fe7b	373	return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
7c657876 ACM	374	}
7c657876 ACM	375
2d0817d1 ACM	376	int dccp_insert_option_elapsed_time(struct sock sk, struct sk_buff skb,
2d0817d1 ACM	377	u32 elapsed_time)
7c657876	378	{
7c657876 ACM	379	const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
	380	const int len = 2 + elapsed_time_len;
	381	unsigned char *to;
	382
1bc09869	383	if (elapsed_time_len == 0)
2d0817d1	384	return 0;
7c657876	385
2d0817d1 ACM	386	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
2d0817d1 ACM	387	return -1;
7c657876 ACM	388
	389	DCCP_SKB_CB(skb)->dccpd_opt_len += len;
	390
	391	to = skb_push(skb, len);
	392	*to++ = DCCPO_ELAPSED_TIME;
	393	*to++ = len;
	394
1bc09869	395	if (elapsed_time_len == 2) {
60fe62e7	396	const __be16 var16 = htons((u16)elapsed_time);
1bc09869 IM	397	memcpy(to, &var16, 2);
1bc09869 IM	398	} else {
60fe62e7	399	const __be32 var32 = htonl(elapsed_time);
1bc09869 IM	400	memcpy(to, &var32, 4);
1bc09869 IM	401	}
7c657876	402
2d0817d1	403	return 0;
7c657876 ACM	404	}
7c657876 ACM	405
d4b81ff7	406	EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
7c657876	407
2d0817d1	408	int dccp_insert_option_timestamp(struct sock sk, struct sk_buff skb)
7c657876	409	{
4c70f383	410	__be32 now = htonl(dccp_timestamp());
1bc09869 IM	411	/* yes this will overflow but that is the point as we want a
	412	* 10 usec 32 bit timer which mean it wraps every 11.9 hours */
	413
2d0817d1	414	return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
7c657876 ACM	415	}
7c657876 ACM	416
d4b81ff7 ACM	417	EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
d4b81ff7 ACM	418
b4d4f7c7 GR	419	static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
b4d4f7c7 GR	420	struct dccp_request_sock *dreq,
2d0817d1	421	struct sk_buff *skb)
7c657876	422	{
60fe62e7	423	__be32 tstamp_echo;
7c657876	424	unsigned char *to;
b4d4f7c7 GR	425	u32 elapsed_time, elapsed_time_len, len;
	426
	427	if (dreq != NULL) {
	428	elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time;
	429	tstamp_echo = htonl(dreq->dreq_timestamp_echo);
	430	dreq->dreq_timestamp_echo = 0;
	431	} else {
	432	elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time;
	433	tstamp_echo = htonl(dp->dccps_timestamp_echo);
	434	dp->dccps_timestamp_echo = 0;
	435	}
	436
b0e56780 ACM	437	elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
	438	len = 6 + elapsed_time_len;
	439
2d0817d1 ACM	440	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
2d0817d1 ACM	441	return -1;
7c657876 ACM	442
	443	DCCP_SKB_CB(skb)->dccpd_opt_len += len;
	444
	445	to = skb_push(skb, len);
	446	*to++ = DCCPO_TIMESTAMP_ECHO;
	447	*to++ = len;
	448
7c657876 ACM	449	memcpy(to, &tstamp_echo, 4);
7c657876 ACM	450	to += 4;
afe00251	451
1bc09869	452	if (elapsed_time_len == 2) {
60fe62e7	453	const __be16 var16 = htons((u16)elapsed_time);
1bc09869 IM	454	memcpy(to, &var16, 2);
1bc09869 IM	455	} else if (elapsed_time_len == 4) {
60fe62e7	456	const __be32 var32 = htonl(elapsed_time);
1bc09869 IM	457	memcpy(to, &var32, 4);
1bc09869 IM	458	}
7c657876	459
2d0817d1	460	return 0;
7c657876 ACM	461	}
7c657876 ACM	462
410e27a4 GR	463	static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
410e27a4 GR	464	u8 *val, u8 len)
4829007c	465	{
410e27a4	466	u8 *to;
4829007c	467
410e27a4 GR	468	if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
410e27a4 GR	469	DCCP_WARN("packet too small for feature %d option!\n", feat);
4829007c	470	return -1;
c2f42077	471	}
4829007c	472
410e27a4	473	DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
4829007c	474
410e27a4 GR	475	to = skb_push(skb, len + 3);
	476	*to++ = type;
	477	*to++ = len + 3;
	478	*to++ = feat;
4829007c	479
410e27a4 GR	480	if (len)
410e27a4 GR	481	memcpy(to, val, len);
d0440ee6	482
410e27a4 GR	483	dccp_pr_debug("%s(%s (%d), ...), length %d\n",
	484	dccp_feat_typename(type),
	485	dccp_feat_name(feat), feat, len);
d0440ee6 GR	486	return 0;
	487	}
	488
410e27a4	489	static int dccp_insert_options_feat(struct sock sk, struct sk_buff skb)
afe00251	490	{
410e27a4 GR	491	struct dccp_minisock *dmsk = dccp_msk(sk);
	492	struct dccp_opt_pend opt, next;
	493	int change = 0;
	494
	495	/* confirm any options [NN opts] */
	496	list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
	497	dccp_insert_feat_opt(skb, opt->dccpop_type,
	498	opt->dccpop_feat, opt->dccpop_val,
	499	opt->dccpop_len);
	500	/* fear empty confirms */
	501	if (opt->dccpop_val)
	502	kfree(opt->dccpop_val);
	503	kfree(opt);
	504	}
	505	INIT_LIST_HEAD(&dmsk->dccpms_conf);
	506
	507	/* see which features we need to send */
	508	list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
	509	/* see if we need to send any confirm */
	510	if (opt->dccpop_sc) {
	511	dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
	512	opt->dccpop_feat,
	513	opt->dccpop_sc->dccpoc_val,
	514	opt->dccpop_sc->dccpoc_len);
	515
	516	BUG_ON(!opt->dccpop_sc->dccpoc_val);
	517	kfree(opt->dccpop_sc->dccpoc_val);
	518	kfree(opt->dccpop_sc);
	519	opt->dccpop_sc = NULL;
	520	}
afe00251	521
410e27a4 GR	522	/* any option not confirmed, re-send it */
	523	if (!opt->dccpop_conf) {
	524	dccp_insert_feat_opt(skb, opt->dccpop_type,
	525	opt->dccpop_feat, opt->dccpop_val,
	526	opt->dccpop_len);
	527	change++;
	528	}
afe00251 AB	529	}
afe00251 AB	530
afe00251 AB	531	return 0;
	532	}
	533
af3b867e GR	534	/* The length of all options needs to be a multiple of 4 (5.8) */
	535	static void dccp_insert_option_padding(struct sk_buff *skb)
	536	{
	537	int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
	538
	539	if (padding != 0) {
	540	padding = 4 - padding;
	541	memset(skb_push(skb, padding), 0, padding);
	542	DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
	543	}
	544	}
	545
2d0817d1	546	int dccp_insert_options(struct sock sk, struct sk_buff skb)
7c657876 ACM	547	{
7c657876 ACM	548	struct dccp_sock *dp = dccp_sk(sk);
410e27a4	549	struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876 ACM	550
	551	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
	552
410e27a4 GR	553	if (dmsk->dccpms_send_ndp_count &&
410e27a4 GR	554	dccp_insert_option_ndp(sk, skb))
2d0817d1	555	return -1;
7c657876	556
410e27a4 GR	557	if (!dccp_packet_without_ack(skb)) {
	558	if (dmsk->dccpms_send_ack_vector &&
	559	dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
	560	dccp_insert_option_ackvec(sk, skb))
2d0817d1	561	return -1;
7c657876 ACM	562	}
7c657876 ACM	563
507d37cf	564	if (dp->dccps_hc_rx_insert_options) {
2d0817d1 ACM	565	if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
2d0817d1 ACM	566	return -1;
507d37cf ACM	567	dp->dccps_hc_rx_insert_options = 0;
507d37cf ACM	568	}
7c657876	569
410e27a4 GR	570	/* Feature negotiation */
	571	/* Data packets can't do feat negotiation */
	572	if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
	573	DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
	574	dccp_insert_options_feat(sk, skb))
	575	return -1;
	576
	577	/*
	578	* Obtain RTT sample from Request/Response exchange.
	579	* This is currently used in CCID 3 initialisation.
	580	*/
	581	if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
	582	dccp_insert_option_timestamp(sk, skb))
	583	return -1;
	584
b4d4f7c7 GR	585	if (dp->dccps_timestamp_echo != 0 &&
	586	dccp_insert_option_timestamp_echo(dp, NULL, skb))
	587	return -1;
	588
af3b867e GR	589	dccp_insert_option_padding(skb);
	590	return 0;
	591	}
7c657876	592
af3b867e GR	593	int dccp_insert_options_rsk(struct dccp_request_sock dreq, struct sk_buff skb)
	594	{
	595	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
7c657876	596
af3b867e GR	597	if (dreq->dreq_timestamp_echo != 0 &&
	598	dccp_insert_option_timestamp_echo(NULL, dreq, skb))
	599	return -1;
2d0817d1	600
af3b867e	601	dccp_insert_option_padding(skb);
2d0817d1	602	return 0;
7c657876	603	}