Differential D29471 Diff 86452 sys/netinet/tcp_hostcache.c

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sys/netinet/tcp_hostcache.c

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* Sysctl function: prints the list and values of all hostcache entries in		* Sysctl function: prints the list and values of all hostcache entries in
* unsorted order.		* unsorted order.
*/		*/
static int		static int
sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS)		sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS)
{		{
const int linesize = 128;		const int linesize = 128;
struct sbuf sb;		struct sbuf sb;
int i, error;		int i, error, len;
		hselaskyUnsubmitted Done Inline Actions Setting error to 0 is superfluous from what I can see. hselasky: Setting error to 0 is superfluous from what I can see.
struct hc_metrics *hc_entry;		struct hc_metrics *hc_entry;
char ip4buf[INET_ADDRSTRLEN];		char ip4buf[INET_ADDRSTRLEN];
#ifdef INET6		#ifdef INET6
char ip6buf[INET6_ADDRSTRLEN];		char ip6buf[INET6_ADDRSTRLEN];
#endif		#endif

if (jailed_without_vnet(curthread->td_ucred) != 0)		if (jailed_without_vnet(curthread->td_ucred) != 0)
return (EPERM);		return (EPERM);

sbuf_new(&sb, NULL, linesize * (V_tcp_hostcache.cache_count + 1),		/* Optimize Buffer length query by sbin/sysctl */
SBUF_INCLUDENUL);		if (req->oldptr == NULL) {
		len = (V_tcp_hostcache.cache_count + 1) * linesize;
		return (SYSCTL_OUT(req, NULL, len));
		}

		error = sysctl_wire_old_buffer(req, 0);
		if (error != 0) {
		return(error);
		}

		/* Use a buffer for 16 lines */
		sbuf_new_for_sysctl(&sb, NULL, 16 * linesize, req);

sbuf_printf(&sb,		sbuf_printf(&sb,
"\nIP address MTU SSTRESH RTT RTTVAR "		"\nIP address MTU SSTRESH RTT RTTVAR "
" CWND SENDPIPE RECVPIPE HITS UPD EXP\n");		" CWND SENDPIPE RECVPIPE HITS UPD EXP\n");

#define msec(u) (((u) + 500) / 1000)		#define msec(u) (((u) + 500) / 1000)
for (i = 0; i < V_tcp_hostcache.hashsize; i++) {		for (i = 0; i < V_tcp_hostcache.hashsize; i++) {
THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);		THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
TAILQ_FOREACH(hc_entry, &V_tcp_hostcache.hashbase[i].hch_bucket,		TAILQ_FOREACH(hc_entry, &V_tcp_hostcache.hashbase[i].hch_bucket,
rmx_q) {		rmx_q) {
sbuf_printf(&sb,		sbuf_printf(&sb,
Show All 18 Lines	#endif
hc_entry->rmx_hits,		hc_entry->rmx_hits,
hc_entry->rmx_updates,		hc_entry->rmx_updates,
hc_entry->rmx_expire);		hc_entry->rmx_expire);
}		}
THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);		THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
}		}
#undef msec		#undef msec
error = sbuf_finish(&sb);		error = sbuf_finish(&sb);
if (error == 0)
error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
sbuf_delete(&sb);		sbuf_delete(&sb);
return(error);		return(error);
}		}

/*		/*
* Caller has to make sure the curvnet is set properly.		* Caller has to make sure the curvnet is set properly.
*/		*/
static void		static void
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