Commit 7c657876 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[DCCP]: Initial implementation 

Development to this point was done on a subversion repository at:

http://oops.ghostprotocols.net:81/cgi-bin/viewcvs.cgi/dccp-2.6/



This repository will be kept at this site for the foreseable future,
so that interested parties can see the history of this code,
attributions, etc.

If I ever decide to take this offline I'll provide the full history at
some other suitable place.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c4365c92

include/linux/dccp.h

0 → 100644
+432 −0
Original line number Diff line number Diff line 
#ifndef _LINUX_DCCP_H

#define _LINUX_DCCP_H



#include <linux/in.h>

#include <linux/list.h>

#include <linux/types.h>

#include <linux/uio.h>

#include <linux/workqueue.h>



#include <net/inet_connection_sock.h>

#include <net/sock.h>

#include <net/tcp_states.h>

#include <net/tcp.h>



/* FIXME: this is utterly wrong */

struct sockaddr_dccp {

	struct sockaddr_in	in;

	unsigned int		service;

};



enum dccp_state {

	DCCP_OPEN	= TCP_ESTABLISHED,

	DCCP_REQUESTING	= TCP_SYN_SENT,

	DCCP_PARTOPEN	= TCP_FIN_WAIT1, /* FIXME:

					    This mapping is horrible, but TCP has

					    no matching state for DCCP_PARTOPEN,

					    as TCP_SYN_RECV is already used by

					    DCCP_RESPOND, why don't stop using TCP

					    mapping of states? OK, now we don't use

					    sk_stream_sendmsg anymore, so doesn't

					    seem to exist any reason for us to

					    do the TCP mapping here */

	DCCP_LISTEN	= TCP_LISTEN,

	DCCP_RESPOND	= TCP_SYN_RECV,

	DCCP_CLOSING	= TCP_CLOSING,

	DCCP_TIME_WAIT	= TCP_TIME_WAIT,

	DCCP_CLOSED	= TCP_CLOSE,

	DCCP_MAX_STATES = TCP_MAX_STATES,

};



#define DCCP_STATE_MASK 0xf

#define DCCP_ACTION_FIN (1<<7)



enum {

	DCCPF_OPEN	 = TCPF_ESTABLISHED,

	DCCPF_REQUESTING = TCPF_SYN_SENT,

	DCCPF_PARTOPEN	 = TCPF_FIN_WAIT1,

	DCCPF_LISTEN	 = TCPF_LISTEN,

	DCCPF_RESPOND	 = TCPF_SYN_RECV,

	DCCPF_CLOSING	 = TCPF_CLOSING,

	DCCPF_TIME_WAIT	 = TCPF_TIME_WAIT,

	DCCPF_CLOSED	 = TCPF_CLOSE,

};



/**

 * struct dccp_hdr - generic part of DCCP packet header

 *

 * @dccph_sport - Relevant port on the endpoint that sent this packet

 * @dccph_dport - Relevant port on the other endpoint

 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words

 * @dccph_ccval - Used by the HC-Sender CCID

 * @dccph_cscov - Parts of the packet that are covered by the Checksum field

 * @dccph_checksum - Internet checksum, depends on dccph_cscov

 * @dccph_x - 0 = 24 bit sequence number, 1 = 48

 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros

 * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x

 */

struct dccp_hdr {

	__u16	dccph_sport,

		dccph_dport;

	__u8	dccph_doff;

#if defined(__LITTLE_ENDIAN_BITFIELD)

	__u8	dccph_cscov:4,

		dccph_ccval:4;

#elif defined(__BIG_ENDIAN_BITFIELD)

	__u8	dccph_ccval:4,

		dccph_cscov:4;

#else

#error  "Adjust your <asm/byteorder.h> defines"

#endif

	__u16	dccph_checksum;

#if defined(__LITTLE_ENDIAN_BITFIELD)

	__u32	dccph_x:1,

		dccph_type:4,

		dccph_reserved:3,

		dccph_seq:24;

#elif defined(__BIG_ENDIAN_BITFIELD)

	__u32	dccph_reserved:3,

		dccph_type:4,

		dccph_x:1,

		dccph_seq:24;

#else

#error  "Adjust your <asm/byteorder.h> defines"

#endif

};



static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)

{

	return (struct dccp_hdr *)skb->h.raw;

}



/**

 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet

 *

 * @dccph_seq_low - low 24 bits of a 48 bit seq packet

 */

struct dccp_hdr_ext {

	__u32	dccph_seq_low;

};



static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)

{

	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));

}



static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)

{

	const struct dccp_hdr *dh = dccp_hdr(skb);

	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);

}



static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)

{

	const struct dccp_hdr *dh = dccp_hdr(skb);

#if defined(__LITTLE_ENDIAN_BITFIELD)

	__u64 seq_nr = ntohl(dh->dccph_seq << 8);

#elif defined(__BIG_ENDIAN_BITFIELD)

	__u64 seq_nr = ntohl(dh->dccph_seq);

#else

#error  "Adjust your <asm/byteorder.h> defines"

#endif



	if (dh->dccph_x != 0)

		seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);



	return seq_nr;

}



/**

 * struct dccp_hdr_request - Conection initiation request header

 *

 * @dccph_req_service - Service to which the client app wants to connect

 * @dccph_req_options - list of options (must be a multiple of 32 bits

 */

struct dccp_hdr_request {

	__u32	dccph_req_service;

};



static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)

{

	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));

}



/**

 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets

 *

 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR

 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR

 */

struct dccp_hdr_ack_bits {

	__u32	dccph_reserved1:8,

		dccph_ack_nr_high:24;

	__u32	dccph_ack_nr_low;

};



static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)

{

	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));

}



static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)

{

	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);

#if defined(__LITTLE_ENDIAN_BITFIELD)

	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);

#elif defined(__BIG_ENDIAN_BITFIELD)

	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);

#else

#error  "Adjust your <asm/byteorder.h> defines"

#endif

}



/**

 * struct dccp_hdr_response - Conection initiation response header

 *

 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR

 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR

 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request

 * @dccph_resp_options - list of options (must be a multiple of 32 bits

 */

struct dccp_hdr_response {

	struct dccp_hdr_ack_bits	dccph_resp_ack;

	__u32				dccph_resp_service;

};



static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)

{

	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));

}



/**

 * struct dccp_hdr_reset - Unconditionally shut down a connection

 *

 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request

 * @dccph_reset_options - list of options (must be a multiple of 32 bits

 */

struct dccp_hdr_reset {

	struct dccp_hdr_ack_bits	dccph_reset_ack;

	__u8				dccph_reset_code,

					dccph_reset_data[3];

};



static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)

{

	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));

}



enum dccp_pkt_type {

	DCCP_PKT_REQUEST = 0,

	DCCP_PKT_RESPONSE,

	DCCP_PKT_DATA,

	DCCP_PKT_ACK,

	DCCP_PKT_DATAACK,

	DCCP_PKT_CLOSEREQ,

	DCCP_PKT_CLOSE,

	DCCP_PKT_RESET,

	DCCP_PKT_SYNC,

	DCCP_PKT_SYNCACK,

	DCCP_PKT_INVALID,

};



#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID



static inline unsigned int dccp_packet_hdr_len(const __u8 type)

{

	if (type == DCCP_PKT_DATA)

		return 0;

	if (type == DCCP_PKT_DATAACK	||

	    type == DCCP_PKT_ACK	||

	    type == DCCP_PKT_SYNC	||

	    type == DCCP_PKT_SYNCACK	||

	    type == DCCP_PKT_CLOSE	||

	    type == DCCP_PKT_CLOSEREQ)

		return sizeof(struct dccp_hdr_ack_bits);

	if (type == DCCP_PKT_REQUEST)

		return sizeof(struct dccp_hdr_request);

	if (type == DCCP_PKT_RESPONSE)

		return sizeof(struct dccp_hdr_response);

	return sizeof(struct dccp_hdr_reset);

}



static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)

{

	return dccp_basic_hdr_len(skb) +

	       dccp_packet_hdr_len(dccp_hdr(skb)->dccph_type);

}



enum dccp_reset_codes {

	DCCP_RESET_CODE_UNSPECIFIED = 0,

	DCCP_RESET_CODE_CLOSED,

	DCCP_RESET_CODE_ABORTED,

	DCCP_RESET_CODE_NO_CONNECTION,

	DCCP_RESET_CODE_PACKET_ERROR,

	DCCP_RESET_CODE_OPTION_ERROR,

	DCCP_RESET_CODE_MANDATORY_ERROR,

	DCCP_RESET_CODE_CONNECTION_REFUSED,

	DCCP_RESET_CODE_BAD_SERVICE_CODE,

	DCCP_RESET_CODE_TOO_BUSY,

	DCCP_RESET_CODE_BAD_INIT_COOKIE,

	DCCP_RESET_CODE_AGGRESSION_PENALTY,

};



/* DCCP options */

enum {

	DCCPO_PADDING = 0,

	DCCPO_MANDATORY = 1,

	DCCPO_MIN_RESERVED = 3,

	DCCPO_MAX_RESERVED = 31,

	DCCPO_NDP_COUNT = 37,

	DCCPO_ACK_VECTOR_0 = 38,

	DCCPO_ACK_VECTOR_1 = 39,

	DCCPO_TIMESTAMP = 41,

	DCCPO_TIMESTAMP_ECHO = 42,

	DCCPO_ELAPSED_TIME = 43,

	DCCPO_MAX = 45,

	DCCPO_MIN_CCID_SPECIFIC = 128,

	DCCPO_MAX_CCID_SPECIFIC = 255,

};



/* DCCP features */

enum {

	DCCPF_RESERVED = 0,

	DCCPF_SEQUENCE_WINDOW = 3,

	DCCPF_SEND_ACK_VECTOR = 6,

	DCCPF_SEND_NDP_COUNT = 7,

	/* 10-127 reserved */

	DCCPF_MIN_CCID_SPECIFIC = 128,

	DCCPF_MAX_CCID_SPECIFIC = 255,

};



/* initial values for each feature */

#define DCCPF_INITIAL_SEQUENCE_WINDOW		100

/* FIXME: for now we're using CCID 3 (TFRC) */

#define DCCPF_INITIAL_CCID			3

#define DCCPF_INITIAL_SEND_ACK_VECTOR		0

/* FIXME: for now we're default to 1 but it should really be 0 */

#define DCCPF_INITIAL_SEND_NDP_COUNT		1



#define DCCP_NDP_LIMIT 0xFFFFFF



/**

  * struct dccp_options - option values for a DCCP connection

  *	@dccpo_sequence_window - Sequence Window Feature (section 7.5.2)

  *	@dccpo_ccid - Congestion Control Id (CCID) (section 10)

  *	@dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)

  *	@dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)

  */

struct dccp_options {

	__u64	dccpo_sequence_window;

	__u8	dccpo_ccid;

	__u8	dccpo_send_ack_vector;

	__u8	dccpo_send_ndp_count;

};



extern void __dccp_options_init(struct dccp_options *dccpo);

extern void dccp_options_init(struct dccp_options *dccpo);

extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);



struct dccp_request_sock {

	struct inet_request_sock dreq_inet_rsk;

	__u64			 dreq_iss;

	__u64			 dreq_isr;

	__u32			 dreq_service;

};



static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)

{

	return (struct dccp_request_sock *)req;

}



/* Read about the ECN nonce to see why it is 253 */

#define DCCP_MAX_ACK_VECTOR_LEN 253



struct dccp_options_received {

	u32	dccpor_ndp:24,

		dccpor_ack_vector_len:8;

	u32	dccpor_ack_vector_idx:10;

	/* 22 bits hole, try to pack */

	u32	dccpor_timestamp;

	u32	dccpor_timestamp_echo;

	u32	dccpor_elapsed_time;

};



struct ccid;



enum dccp_role {

	DCCP_ROLE_UNDEFINED,

	DCCP_ROLE_LISTEN,

	DCCP_ROLE_CLIENT,

	DCCP_ROLE_SERVER,

};



/**

 * struct dccp_sock - DCCP socket state

 *

 * @dccps_swl - sequence number window low

 * @dccps_swh - sequence number window high

 * @dccps_awl - acknowledgement number window low

 * @dccps_awh - acknowledgement number window high

 * @dccps_iss - initial sequence number sent

 * @dccps_isr - initial sequence number received

 * @dccps_osr - first OPEN sequence number received

 * @dccps_gss - greatest sequence number sent

 * @dccps_gsr - greatest valid sequence number received

 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss

 * @dccps_timestamp_time - time of latest TIMESTAMP option

 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option

 * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)

 * @dccps_pmtu_cookie - Last pmtu seen by socket

 * @dccps_avg_packet_size - FIXME: has to be set by the app thru some setsockopt or ioctl, CCID3 uses it

 * @dccps_role - Role of this sock, one of %dccp_role

 * @dccps_ndp_count - number of Non Data Packets since last data packet

 * @dccps_hc_rx_ackpkts - receiver half connection acked packets

 */

struct dccp_sock {

	/* inet_connection_sock has to be the first member of dccp_sock */

	struct inet_connection_sock	dccps_inet_connection;

	__u64				dccps_swl;

	__u64				dccps_swh;

	__u64				dccps_awl;

	__u64				dccps_awh;

	__u64				dccps_iss;

	__u64				dccps_isr;

	__u64				dccps_osr;

	__u64				dccps_gss;

	__u64				dccps_gsr;

	__u64				dccps_gar;

	unsigned long			dccps_service;

	unsigned long			dccps_timestamp_time;

	__u32				dccps_timestamp_echo;

	__u32				dccps_avg_packet_size;

	unsigned long			dccps_ndp_count;

	__u16				dccps_ext_header_len;

	__u32				dccps_pmtu_cookie;

	__u32				dccps_mss_cache;

	struct dccp_options		dccps_options;

	struct dccp_ackpkts		*dccps_hc_rx_ackpkts;

	void				*dccps_hc_rx_ccid_private;

	void				*dccps_hc_tx_ccid_private;

	struct ccid			*dccps_hc_rx_ccid;

	struct ccid			*dccps_hc_tx_ccid;

	struct dccp_options_received	dccps_options_received;

	enum dccp_role			dccps_role:2;

};

 

static inline struct dccp_sock *dccp_sk(const struct sock *sk)

{

	return (struct dccp_sock *)sk;

}



static inline const char *dccp_role(const struct sock *sk)

{

	switch (dccp_sk(sk)->dccps_role) {

	case DCCP_ROLE_UNDEFINED: return "undefined";

	case DCCP_ROLE_LISTEN:	  return "listen";

	case DCCP_ROLE_SERVER:	  return "server";

	case DCCP_ROLE_CLIENT:	  return "client";

	}

	return NULL;

}



#endif /* _LINUX_DCCP_H */

include/linux/in.h

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ enum { 
  IPPROTO_PUP = 12,		/* PUP protocol				*/

  IPPROTO_UDP = 17,		/* User Datagram Protocol		*/

  IPPROTO_IDP = 22,		/* XNS IDP protocol			*/

  IPPROTO_DCCP = 33,		/* Datagram Congestion Control Protocol */

  IPPROTO_RSVP = 46,		/* RSVP protocol			*/

  IPPROTO_GRE = 47,		/* Cisco GRE tunnels (rfc 1701,1702)	*/

include/linux/net.h

+1 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ enum sock_type { 
	SOCK_RAW	= 3,

	SOCK_RDM	= 4,

	SOCK_SEQPACKET	= 5,

	SOCK_DCCP	= 6,

	SOCK_PACKET	= 10,

};

include/linux/socket.h

+1 −0
Original line number Diff line number Diff line
@@ -271,6 +271,7 @@ struct ucred { 
#define SOL_IRDA        266

#define SOL_NETBEUI	267

#define SOL_LLC		268

#define SOL_DCCP	269



/* IPX options */

#define IPX_TYPE	1

net/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -147,6 +147,7 @@ source "net/bridge/netfilter/Kconfig" 


endif



source "net/dccp/Kconfig"

source "net/sctp/Kconfig"

source "net/atm/Kconfig"

source "net/bridge/Kconfig"

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