Commit 2a91aa39 authored by Andrea Bittau's avatar Andrea Bittau Committed by David S. Miller
Browse files

[DCCP] CCID2: Initial CCID2 (TCP-Like) implementation 



Original work by Andrea Bittau, Arnaldo Melo cleaned up and fixed several
issues on the merge process.

For now CCID2 was turned the default for all SOCK_DCCP connections, but this
will be remedied soon with the merge of the feature negotiation code.

Signed-off-by: default avatarAndrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aa5d7df3

include/linux/dccp.h

+5 −3
Original line number Diff line number Diff line
@@ -314,9 +314,9 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) 


/* 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 using CCID 2 (TCP-Like) */

#define DCCPF_INITIAL_CCID			2

#define DCCPF_INITIAL_SEND_ACK_VECTOR		1

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

#define DCCPF_INITIAL_SEND_NDP_COUNT		1
@@ -430,6 +430,8 @@ struct dccp_sock { 
	struct timeval			dccps_timestamp_time;

	__u32				dccps_timestamp_echo;

	__u32				dccps_packet_size;

	__u16				dccps_l_ack_ratio;

	__u16				dccps_r_ack_ratio;

	unsigned long			dccps_ndp_count;

	__u32				dccps_mss_cache;

	struct dccp_options		dccps_options;

net/dccp/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -24,6 +24,10 @@ config INET_DCCP_DIAG 
	def_tristate y if (IP_DCCP = y && INET_DIAG = y)

	def_tristate m



config IP_DCCP_ACKVEC

	depends on IP_DCCP

	def_bool N



source "net/dccp/ccids/Kconfig"



menu "DCCP Kernel Hacking"

net/dccp/ccids/Kconfig

+36 −3
Original line number Diff line number Diff line 
menu "DCCP CCIDs Configuration (EXPERIMENTAL)"

	depends on IP_DCCP && EXPERIMENTAL



config IP_DCCP_CCID2

	tristate "CCID2 (TCP) (EXPERIMENTAL)"

	depends on IP_DCCP

	select IP_DCCP_ACKVEC

	---help---

	  CCID 2, TCP-like Congestion Control, denotes Additive Increase,

	  Multiplicative Decrease (AIMD) congestion control with behavior

	  modelled directly on TCP, including congestion window, slow start,

	  timeouts, and so forth [RFC 2581].  CCID 2 achieves maximum

	  bandwidth over the long term, consistent with the use of end-to-end

	  congestion control, but halves its congestion window in response to

	  each congestion event.  This leads to the abrupt rate changes

	  typical of TCP.  Applications should use CCID 2 if they prefer

	  maximum bandwidth utilization to steadiness of rate.  This is often

	  the case for applications that are not playing their data directly

	  to the user.  For example, a hypothetical application that

	  transferred files over DCCP, using application-level retransmissions

	  for lost packets, would prefer CCID 2 to CCID 3.  On-line games may

	  also prefer CCID 2.



	  CCID 2 is further described in:

	  http://www.icir.org/kohler/dccp/draft-ietf-dccp-ccid2-10.txt



	  This text was extracted from:

	  http://www.icir.org/kohler/dccp/draft-ietf-dccp-spec-13.txt



	  If in doubt, say M.



config IP_DCCP_CCID3

	tristate "CCID3 (TFRC) (EXPERIMENTAL)"

	depends on IP_DCCP
@@ -15,10 +43,15 @@ config IP_DCCP_CCID3 
	  suitable than CCID 2 for applications such streaming media where a

	  relatively smooth sending rate is of importance.



	  CCID 3 is further described in [CCID 3 PROFILE]. The TFRC

	  congestion control algorithms were initially described in RFC 3448.

	  CCID 3 is further described in:



	  http://www.icir.org/kohler/dccp/draft-ietf-dccp-ccid3-11.txt.



	  The TFRC congestion control algorithms were initially described in

	  RFC 3448.



	  This text was extracted from draft-ietf-dccp-spec-11.txt.

	  This text was extracted from:

	  http://www.icir.org/kohler/dccp/draft-ietf-dccp-spec-13.txt

	  

	  If in doubt, say M.

net/dccp/ccids/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -2,4 +2,8 @@ obj-$(CONFIG_IP_DCCP_CCID3) += dccp_ccid3.o 


dccp_ccid3-y := ccid3.o



obj-$(CONFIG_IP_DCCP_CCID2) += dccp_ccid2.o



dccp_ccid2-y := ccid2.o



obj-y += lib/

net/dccp/ccids/ccid2.c

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