Commit e55d912f authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[DCCP] feat: Introduce sysctls for the default features 



[root@qemu ~]# for a in /proc/sys/net/dccp/default/* ; do echo $a ; cat $a ; done
/proc/sys/net/dccp/default/ack_ratio
2
/proc/sys/net/dccp/default/rx_ccid
3
/proc/sys/net/dccp/default/send_ackvec
1
/proc/sys/net/dccp/default/send_ndp
1
/proc/sys/net/dccp/default/seq_window
100
/proc/sys/net/dccp/default/tx_ccid
3
[root@qemu ~]#

So if wanting to test ccid3 as the tx CCID one can just do:

[root@qemu ~]# echo 3 > /proc/sys/net/dccp/default/tx_ccid
[root@qemu ~]# echo 2 > /proc/sys/net/dccp/default/rx_ccid
[root@qemu ~]# cat /proc/sys/net/dccp/default/[tr]x_ccid
2
3
[root@qemu ~]#

Of course we also need the setsockopt for each app to tell its preferences, but
for testing or defining something other than CCID2 as the default for apps that
don't explicitely set their preference the sysctl interface is handy.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 04e2661e

include/linux/sysctl.h

+16 −0
Original line number Diff line number Diff line
@@ -211,6 +211,7 @@ enum 
	NET_SCTP=17,

	NET_LLC=18,

	NET_NETFILTER=19,

	NET_DCCP=20,

};



/* /proc/sys/kernel/random */
@@ -571,6 +572,21 @@ enum { 
	__NET_NEIGH_MAX

};



/* /proc/sys/net/dccp */

enum {

	NET_DCCP_DEFAULT=1,

};



/* /proc/sys/net/dccp/default */

enum {

	NET_DCCP_DEFAULT_SEQ_WINDOW  = 1,

	NET_DCCP_DEFAULT_RX_CCID     = 2,

	NET_DCCP_DEFAULT_TX_CCID     = 3,

	NET_DCCP_DEFAULT_ACK_RATIO   = 4,

	NET_DCCP_DEFAULT_SEND_ACKVEC = 5,

	NET_DCCP_DEFAULT_SEND_NDP    = 6,

};



/* /proc/sys/net/ipx */

enum {

	NET_IPX_PPROP_BROADCASTING=1,

net/dccp/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -11,6 +11,8 @@ dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o 


obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o



dccp-$(CONFIG_SYSCTL) += sysctl.o



dccp_diag-y := diag.o



obj-y += ccids/

net/dccp/dccp.h

+14 −0
Original line number Diff line number Diff line
@@ -433,4 +433,18 @@ static inline void timeval_sub_usecs(struct timeval *tv, 
	}

}



#ifdef CONFIG_SYSCTL

extern int dccp_sysctl_init(void);

extern void dccp_sysctl_exit(void);

#else

static inline int dccp_sysctl_init(void)

{

	return 0;

}



static inline void dccp_sysctl_exit(void)

{

}

#endif



#endif /* _DCCP_H */

net/dccp/options.c

+12 −10
Original line number Diff line number Diff line
@@ -23,19 +23,21 @@ 
#include "dccp.h"

#include "feat.h"



/* stores the default values for new connection. may be changed with sysctl */

static const struct dccp_options dccpo_default_values = {

	.dccpo_sequence_window	  = DCCPF_INITIAL_SEQUENCE_WINDOW,

	.dccpo_rx_ccid		  = DCCPF_INITIAL_CCID,

	.dccpo_tx_ccid		  = DCCPF_INITIAL_CCID,

	.dccpo_ack_ratio	  = DCCPF_INITIAL_ACK_RATIO,

	.dccpo_send_ack_vector	  = DCCPF_INITIAL_SEND_ACK_VECTOR,

	.dccpo_send_ndp_count	  = DCCPF_INITIAL_SEND_NDP_COUNT,

};

int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;

int dccp_feat_default_rx_ccid	      = DCCPF_INITIAL_CCID;

int dccp_feat_default_tx_ccid	      = DCCPF_INITIAL_CCID;

int dccp_feat_default_ack_ratio	      = DCCPF_INITIAL_ACK_RATIO;

int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;

int dccp_feat_default_send_ndp_count  = DCCPF_INITIAL_SEND_NDP_COUNT;



void dccp_options_init(struct dccp_options *dccpo)

{

	memcpy(dccpo, &dccpo_default_values, sizeof(*dccpo));

	dccpo->dccpo_sequence_window = dccp_feat_default_sequence_window;

	dccpo->dccpo_rx_ccid	     = dccp_feat_default_rx_ccid;

	dccpo->dccpo_tx_ccid	     = dccp_feat_default_tx_ccid;

	dccpo->dccpo_ack_ratio	     = dccp_feat_default_ack_ratio;

	dccpo->dccpo_send_ack_vector = dccp_feat_default_send_ack_vector;

	dccpo->dccpo_send_ndp_count  = dccp_feat_default_send_ndp_count;

}



static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)

net/dccp/proto.c

+8 −1
Original line number Diff line number Diff line
@@ -934,11 +934,17 @@ static int __init dccp_init(void) 
	if (rc)

		goto out_unregister_protosw;



	rc = dccp_ctl_sock_init();

	rc = dccp_sysctl_init();

	if (rc)

		goto out_ackvec_exit;



	rc = dccp_ctl_sock_init();

	if (rc)

		goto out_sysctl_exit;

out:

	return rc;

out_sysctl_exit:

	dccp_sysctl_exit();

out_ackvec_exit:

	dccp_ackvec_exit();

out_unregister_protosw:
@@ -983,6 +989,7 @@ static void __exit dccp_fini(void) 
	kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);

	proto_unregister(&dccp_prot);

	dccp_ackvec_exit();

	dccp_sysctl_exit();

}



module_init(dccp_init);

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