1 files changed, 0 insertions, 609 deletions

diff --git a/net/dccp/options.c b/net/dccp/options.c
deleted file mode 100644
index db62d4767024..000000000000
--- a/net/dccp/options.c
+++ /dev/null
@@ -1,609 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *  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>
- */
-#include <linux/dccp.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/unaligned.h>
-#include <linux/kernel.h>
-#include <linux/skbuff.h>
-
-#include "ackvec.h"
-#include "ccid.h"
-#include "dccp.h"
-#include "feat.h"
-
-u64 dccp_decode_value_var(const u8 *bf, const u8 len)
-{
-	u64 value = 0;
-
-	if (len >= DCCP_OPTVAL_MAXLEN)
-		value += ((u64)*bf++) << 40;
-	if (len > 4)
-		value += ((u64)*bf++) << 32;
-	if (len > 3)
-		value += ((u64)*bf++) << 24;
-	if (len > 2)
-		value += ((u64)*bf++) << 16;
-	if (len > 1)
-		value += ((u64)*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
- * @skb: frame to parse
- */
-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;
-	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 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 >= DCCPO_MIN_RX_CCID_SPECIFIC ||
-		    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 ... DCCPO_CONFIRM_R:
-			if (pkt_type == DCCP_PKT_DATA)      /* RFC 4340, 6 */
-				break;
-			if (len == 0)
-				goto out_invalid_option;
-			rc = dccp_feat_parse_options(sk, dreq, mandatory, opt,
-						    *value, value + 1, len - 1);
-			if (rc)
-				goto out_featneg_failed;
-			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);
-			/* schedule an Ack in case this sender is quiescent */
-			inet_csk_schedule_ack(sk);
-			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 DCCPO_MIN_RX_CCID_SPECIFIC ... DCCPO_MAX_RX_CCID_SPECIFIC:
-			if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
-						     pkt_type, opt, value, len))
-				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;
-			/*
-			 * Ack vectors are processed by the TX CCID if it is
-			 * interested. The RX CCID need not parse Ack Vectors,
-			 * since it is only interested in clearing old state.
-			 */
-			fallthrough;
-		case DCCPO_MIN_TX_CCID_SPECIFIC ... DCCPO_MAX_TX_CCID_SPECIFIC:
-			if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
-						     pkt_type, opt, value, len))
-				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(DCCP_MIB_INVALIDOPT);
-	rc = DCCP_RESET_CODE_OPTION_ERROR;
-out_featneg_failed:
-	DCCP_WARN("DCCP(%p): Option %d (len=%d) error=%u\n", sk, opt, len, rc);
-	DCCP_SKB_CB(skb)->dccpd_reset_code = rc;
-	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);
-
-void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
-{
-	if (len >= DCCP_OPTVAL_MAXLEN)
-		*to++ = (value & 0xFF0000000000ull) >> 40;
-	if (len > 4)
-		*to++ = (value & 0xFF00000000ull) >> 32;
-	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 <= USHRT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
-}
-
-int dccp_insert_option(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;
-}
-
-static int dccp_insert_option_timestamp(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(skb, DCCPO_TIMESTAMP, &now, sizeof(now));
-}
-
-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_option_ackvec(struct sock *sk, struct sk_buff *skb)
-{
-	struct dccp_sock *dp = dccp_sk(sk);
-	struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
-	struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
-	const u16 buflen = dccp_ackvec_buflen(av);
-	/* Figure out how many options do we need to represent the ackvec */
-	const u8 nr_opts = DIV_ROUND_UP(buflen, DCCP_SINGLE_OPT_MAXLEN);
-	u16 len = buflen + 2 * nr_opts;
-	u8 i, nonce = 0;
-	const unsigned char *tail, *from;
-	unsigned char *to;
-
-	if (dcb->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
-		DCCP_WARN("Lacking space for %u bytes on %s packet\n", len,
-			  dccp_packet_name(dcb->dccpd_type));
-		return -1;
-	}
-	/*
-	 * Since Ack Vectors are variable-length, we can not always predict
-	 * their size. To catch exception cases where the space is running out
-	 * on the skb, a separate Sync is scheduled to carry the Ack Vector.
-	 */
-	if (len > DCCPAV_MIN_OPTLEN &&
-	    len + dcb->dccpd_opt_len + skb->len > dp->dccps_mss_cache) {
-		DCCP_WARN("No space left for Ack Vector (%u) on skb (%u+%u), "
-			  "MPS=%u ==> reduce payload size?\n", len, skb->len,
-			  dcb->dccpd_opt_len, dp->dccps_mss_cache);
-		dp->dccps_sync_scheduled = 1;
-		return 0;
-	}
-	dcb->dccpd_opt_len += len;
-
-	to   = skb_push(skb, len);
-	len  = buflen;
-	from = av->av_buf + av->av_buf_head;
-	tail = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
-
-	for (i = 0; i < nr_opts; ++i) {
-		int copylen = len;
-
-		if (len > DCCP_SINGLE_OPT_MAXLEN)
-			copylen = DCCP_SINGLE_OPT_MAXLEN;
-
-		/*
-		 * RFC 4340, 12.2: Encode the Nonce Echo for this Ack Vector via
-		 * its type; ack_nonce is the sum of all individual buf_nonce's.
-		 */
-		nonce ^= av->av_buf_nonce[i];
-
-		*to++ = DCCPO_ACK_VECTOR_0 + av->av_buf_nonce[i];
-		*to++ = copylen + 2;
-
-		/* Check if buf_head wraps */
-		if (from + copylen > tail) {
-			const u16 tailsize = tail - from;
-
-			memcpy(to, from, tailsize);
-			to	+= tailsize;
-			len	-= tailsize;
-			copylen	-= tailsize;
-			from	= av->av_buf;
-		}
-
-		memcpy(to, from, copylen);
-		from += copylen;
-		to   += copylen;
-		len  -= copylen;
-	}
-	/*
-	 * Each sent Ack Vector is recorded in the list, as per A.2 of RFC 4340.
-	 */
-	if (dccp_ackvec_update_records(av, dcb->dccpd_seq, nonce))
-		return -ENOBUFS;
-	return 0;
-}
-
-/**
- * dccp_insert_option_mandatory  -  Mandatory option (5.8.2)
- * @skb: frame into which to insert option
- *
- * Note that since we are using skb_push, this function needs to be called
- * _after_ inserting the option it is supposed to influence (stack order).
- */
-int dccp_insert_option_mandatory(struct sk_buff *skb)
-{
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
-		return -1;
-
-	DCCP_SKB_CB(skb)->dccpd_opt_len++;
-	*(u8 *)skb_push(skb, 1) = DCCPO_MANDATORY;
-	return 0;
-}
-
-/**
- * dccp_insert_fn_opt  -  Insert single Feature-Negotiation option into @skb
- * @skb: frame to insert feature negotiation option into
- * @type: %DCCPO_CHANGE_L, %DCCPO_CHANGE_R, %DCCPO_CONFIRM_L, %DCCPO_CONFIRM_R
- * @feat: one out of %dccp_feature_numbers
- * @val: NN value or SP array (preferred element first) to copy
- * @len: true length of @val in bytes (excluding first element repetition)
- * @repeat_first: whether to copy the first element of @val twice
- *
- * The last argument is used to construct Confirm options, where the preferred
- * value and the preference list appear separately (RFC 4340, 6.3.1). Preference
- * lists are kept such that the preferred entry is always first, so we only need
- * to copy twice, and avoid the overhead of cloning into a bigger array.
- */
-int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
-		       u8 *val, u8 len, bool repeat_first)
-{
-	u8 tot_len, *to;
-
-	/* take the `Feature' field and possible repetition into account */
-	if (len > (DCCP_SINGLE_OPT_MAXLEN - 2)) {
-		DCCP_WARN("length %u for feature %u too large\n", len, feat);
-		return -1;
-	}
-
-	if (unlikely(val == NULL || len == 0))
-		len = repeat_first = false;
-	tot_len = 3 + repeat_first + len;
-
-	if (DCCP_SKB_CB(skb)->dccpd_opt_len + tot_len > DCCP_MAX_OPT_LEN) {
-		DCCP_WARN("packet too small for feature %d option!\n", feat);
-		return -1;
-	}
-	DCCP_SKB_CB(skb)->dccpd_opt_len += tot_len;
-
-	to    = skb_push(skb, tot_len);
-	*to++ = type;
-	*to++ = tot_len;
-	*to++ = feat;
-
-	if (repeat_first)
-		*to++ = *val;
-	if (len)
-		memcpy(to, val, len);
-	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);
-
-	DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
-
-	if (dp->dccps_send_ndp_count && dccp_insert_option_ndp(sk, skb))
-		return -1;
-
-	if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
-
-		/* Feature Negotiation */
-		if (dccp_feat_insert_opts(dp, NULL, skb))
-			return -1;
-
-		if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
-			/*
-			 * Obtain RTT sample from Request/Response exchange.
-			 * This is currently used for TFRC initialisation.
-			 */
-			if (dccp_insert_option_timestamp(skb))
-				return -1;
-
-		} else if (dccp_ackvec_pending(sk) &&
-			   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;
-	}
-
-	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 (dccp_feat_insert_opts(NULL, dreq, skb))
-		return -1;
-
-	/* Obtain RTT sample from Response/Ack exchange (used by TFRC). */
-	if (dccp_insert_option_timestamp(skb))
-		return -1;
-
-	if (dreq->dreq_timestamp_echo != 0 &&
-	    dccp_insert_option_timestamp_echo(NULL, dreq, skb))
-		return -1;
-
-	dccp_insert_option_padding(skb);
-	return 0;
-}