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[DCCP]: Introduce dccp_get_info 

And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.

For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:

[root@qemu ~]# ./ss -danemi
State       Recv-Q Send-Q  Local Addr:Port  Peer Addr:Port
LISTEN      0      0                *:5001          *:*     ino:628 sk:c1340040
         mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB       0      0       172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
         mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377

This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.

rcv_rtt seems sane tho, matching ping results :-)

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2005-08-23 21:52:35 -07:00 committed by David S. Miller
parent 4fded33b3e
commit 2babe1f6fe
3 changed files with 70 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
net/dccp/ccid.h
View File

@ -50,6 +50,10 @@ struct ccid {
struct sk_buff *skb, int len);
void (*ccid_hc_tx_packet_sent)(struct sock *sk, int more,
int len);
void (*ccid_hc_rx_get_info)(struct sock *sk,
struct tcp_info *info);
void (*ccid_hc_tx_get_info)(struct sock *sk,
struct tcp_info *info);
};
extern int ccid_register(struct ccid *ccid);
@ -159,4 +163,18 @@ static inline void ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,
if (ccid->ccid_hc_rx_insert_options != NULL)
ccid->ccid_hc_rx_insert_options(sk, skb);
}
static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk,
struct tcp_info *info)
{
if (ccid->ccid_hc_rx_get_info != NULL)
ccid->ccid_hc_rx_get_info(sk, info);
}
static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk,
struct tcp_info *info)
{
if (ccid->ccid_hc_tx_get_info != NULL)
ccid->ccid_hc_tx_get_info(sk, info);
}
#endif /* _CCID_H */

27
net/dccp/ccids/ccid3.c
View File

@ -2020,6 +2020,31 @@ static void ccid3_hc_rx_exit(struct sock *sk)
dp->dccps_hc_rx_ccid_private = NULL;
}
static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
{
const struct dccp_sock *dp = dccp_sk(sk);
const struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
if (hcrx == NULL)
return;
info->tcpi_ca_state = hcrx->ccid3hcrx_state;
info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
}
static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
{
const struct dccp_sock *dp = dccp_sk(sk);
const struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
if (hctx == NULL)
return;
info->tcpi_rto = hctx->ccid3hctx_t_rto;
info->tcpi_rtt = hctx->ccid3hctx_rtt;
}
static struct ccid ccid3 = {
.ccid_id = 3,
.ccid_name = "ccid3",
@ -2037,6 +2062,8 @@ static struct ccid ccid3 = {
.ccid_hc_rx_exit = ccid3_hc_rx_exit,
.ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
.ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
.ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
.ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
};
module_param(ccid3_debug, int, 0444);

26
net/dccp/diag.c
View File

@ -14,19 +14,43 @@
#include <linux/module.h>
#include <linux/inet_diag.h>
#include "ccid.h"
#include "dccp.h"
static void dccp_get_info(struct sock *sk, struct tcp_info *info)
{
struct dccp_sock *dp = dccp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
memset(info, 0, sizeof(*info));
info->tcpi_state = sk->sk_state;
info->tcpi_retransmits = icsk->icsk_retransmits;
info->tcpi_probes = icsk->icsk_probes_out;
info->tcpi_backoff = icsk->icsk_backoff;
info->tcpi_pmtu = dp->dccps_pmtu_cookie;
if (dp->dccps_options.dccpo_send_ack_vector)
info->tcpi_options |= TCPI_OPT_SACK;
ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
}
static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
void *_info)
{
r->idiag_rqueue = r->idiag_wqueue = 0;
if (_info != NULL)
dccp_get_info(sk, _info);
}
static struct inet_diag_handler dccp_diag_handler = {
.idiag_hashinfo = &dccp_hashinfo,
.idiag_get_info = dccp_diag_get_info,
.idiag_type = DCCPDIAG_GETSOCK,
.idiag_info_size = 0,
.idiag_info_size = sizeof(struct tcp_info),
};
static int __init dccp_diag_init(void)