Commit 3306c781 authored by Gerrit Renker's avatar Gerrit Renker
Browse files

dccp: Add packet type information to CCID-specific option parsing 



This patch ...
 1. adds packet type information to ccid_hc_{rx,tx}_parse_options(). This is 
    necessary, since table 3 in RFC 4340, 5.8 leaves it to the CCIDs to state
    which options may (not) appear on what packet type.
 
 2. adds such a check for CCID-3's {Loss Event, Receive} Rate as specified in
    RFC 4340 8.3 ("Receive Rate options MUST NOT be sent on DCCP-Data packets")
    and 8.5 ("Loss Event Rate options MUST NOT be sent on DCCP-Data packets").

 3. removes an unused argument `idx' from ccid_hc_{rx,tx}_parse_options(). This
    is also no longer necessary, since the CCID-specific option-parsing routines
    are passed every single parameter of the type-length-value option encoding.

Also added documentation and made argument naming scheme consistent.

Signed-off-by: default avatarGerrit Renker <gerrit@erg.abdn.ac.uk>
parent 47a61e7b

net/dccp/ccid.h

+23 −23
Original line number Diff line number Diff line
@@ -60,18 +60,14 @@ struct ccid_operations { 
	void		(*ccid_hc_tx_exit)(struct sock *sk);

	void		(*ccid_hc_rx_packet_recv)(struct sock *sk,

						  struct sk_buff *skb);

	int		(*ccid_hc_rx_parse_options)(struct sock *sk,

						    unsigned char option,

						    unsigned char len, u16 idx,

						    unsigned char* value);

	int		(*ccid_hc_rx_parse_options)(struct sock *sk, u8 pkt,

						    u8 opt, u8 *val, u8 len);

	int		(*ccid_hc_rx_insert_options)(struct sock *sk,

						     struct sk_buff *skb);

	void		(*ccid_hc_tx_packet_recv)(struct sock *sk,

						  struct sk_buff *skb);

	int		(*ccid_hc_tx_parse_options)(struct sock *sk,

						    unsigned char option,

						    unsigned char len, u16 idx,

						    unsigned char* value);

	int		(*ccid_hc_tx_parse_options)(struct sock *sk, u8 pkt,

						    u8 opt, u8 *val, u8 len);

	int		(*ccid_hc_tx_send_packet)(struct sock *sk,

						  struct sk_buff *skb);

	void		(*ccid_hc_tx_packet_sent)(struct sock *sk,
@@ -163,27 +159,31 @@ static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk, 
		ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);

}



/**

 * ccid_hc_tx_parse_options  -  Parse CCID-specific options sent by the receiver

 * @pkt: type of packet that @opt appears on (RFC 4340, 5.1)

 * @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)

 * @val: value of @opt

 * @len: length of @val in bytes

 */

static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,

					   unsigned char option,

					   unsigned char len, u16 idx,

					   unsigned char* value)

					   u8 pkt, u8 opt, u8 *val, u8 len)

{

	int rc = 0;

	if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)

		rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,

						    value);

	return rc;

	if (ccid->ccid_ops->ccid_hc_tx_parse_options == NULL)

		return 0;

	return ccid->ccid_ops->ccid_hc_tx_parse_options(sk, pkt, opt, val, len);

}



/**

 * ccid_hc_rx_parse_options  -  Parse CCID-specific options sent by the sender

 * Arguments are analogous to ccid_hc_tx_parse_options()

 */

static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,

					   unsigned char option,

					   unsigned char len, u16 idx,

					   unsigned char* value)

					   u8 pkt, u8 opt, u8 *val, u8 len)

{

	int rc = 0;

	if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)

		rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);

	return rc;

	if (ccid->ccid_ops->ccid_hc_rx_parse_options == NULL)

		return 0;

	return ccid->ccid_ops->ccid_hc_rx_parse_options(sk, pkt, opt, val, len);

}



static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,

net/dccp/ccids/ccid3.c

+8 −6
Original line number Diff line number Diff line
@@ -483,9 +483,8 @@ done_computing_x: 
			   jiffies + usecs_to_jiffies(t_nfb));

}



static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,

				     unsigned char len, u16 idx,

				     unsigned char *value)

static int ccid3_hc_tx_parse_options(struct sock *sk, u8 packet_type,

				     u8 option, u8 *optval, u8 optlen)

{

	struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);

	struct ccid3_options_received *opt_recv = &hctx->options_received;
@@ -494,12 +493,15 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 
	switch (option) {

	case TFRC_OPT_RECEIVE_RATE:

	case TFRC_OPT_LOSS_EVENT_RATE:

		if (unlikely(len != 4)) {

		/* Must be ignored on Data packets, cf. RFC 4342 8.3 and 8.5 */

		if (packet_type == DCCP_PKT_DATA)

			break;

		if (unlikely(optlen != 4)) {

			DCCP_WARN("%s(%p), invalid len %d for %u\n",

				  dccp_role(sk), sk, len, option);

				  dccp_role(sk), sk, optlen, option);

			return -EINVAL;

		}

		opt_val = ntohl(get_unaligned((__be32 *)value));

		opt_val = ntohl(get_unaligned((__be32 *)optval));



		if (option == TFRC_OPT_RECEIVE_RATE) {

			opt_recv->ccid3or_receive_rate = opt_val;

net/dccp/options.c

+4 −12
Original line number Diff line number Diff line
@@ -226,23 +226,15 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, 
			dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",

				      dccp_role(sk), elapsed_time);

			break;

		case 128 ... 191: {

			const u16 idx = value - options;



		case 128 ... 191:

			if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,

						     opt, len, idx,

						     value) != 0)

						     pkt_type, opt, value, len))

				goto out_invalid_option;

		}

			break;

		case 192 ... 255: {

			const u16 idx = value - options;



		case 192 ... 255:

			if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,

						     opt, len, idx,

						     value) != 0)

						     pkt_type, opt, value, len))

				goto out_invalid_option;

		}

			break;

		default:

			DCCP_CRIT("DCCP(%p): option %d(len=%d) not "

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