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o Document net.inet.ip.portrange.random* sysctls.

Browse Source 
o Correct a comment about random port allocation threshold
implementation.

Reviewed by:	silby, ru
MFC after:	3 days
This commit is contained in:
Maxim Konovalov 2005-03-23 09:26:38 +00:00
parent 39d1acc38a
commit 6ee79c59d2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=144016
2 changed files with 26 additions and 8 deletions
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17
share/man/man4/ip.4
View File

@ -32,7 +32,7 @@
.\" @(#)ip.4 8.2 (Berkeley) 11/30/93
.\" $FreeBSD$
.\"
.Dd June 14, 2004
.Dd March 23, 2005
.Dt IP 4
.Os
.Sh NAME
@ -331,6 +331,21 @@ In scenarios such as benchmarking, this behavior may be undesirable.
In these cases,
.Va net.inet.ip.portrange.randomized
can be used to toggle randomization off.
If more than
.Va net.inet.ip.portrange.randomcps
ports have been allocated in the last second, then return to sequential
port allocation.
Return to random allocation only once the current port allocation rate
drops below
.Va net.inet.ip.portrange.randomcps
for at least
.Va net.inet.ip.portrange.randomtime
seconds.
The default values for
.Va net.inet.ip.portrange.randomcps
and
.Va net.inet.ip.portrange.randomtime
are 10 port allocations per second and 45 seconds correspondingly.
.Ss "Multicast Options"
.Pp
.Tn IP

17
sys/netinet/in_pcb.c
View File

@ -148,12 +148,14 @@ SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedhigh, 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedlow, 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized,
CTLFLAG_RW, &ipport_randomized, 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps,
CTLFLAG_RW, &ipport_randomcps, 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime,
CTLFLAG_RW, &ipport_randomtime, 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomized, CTLFLAG_RW,
&ipport_randomized, 0, "Enable random port allocation");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomcps, CTLFLAG_RW,
&ipport_randomcps, 0, "Maximum number of random port "
"allocations before switching to a sequental one");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, randomtime, CTLFLAG_RW,
&ipport_randomtime, 0, "Minimum time to keep sequental port "
"allocation before switching to a random one");
/*
* in_pcb.c: manage the Protocol Control Blocks.
@ -1211,7 +1213,8 @@ in_pcbsosetlabel(so)
* allocation should be continued. If more than ipport_randomcps
* ports have been allocated in the last second, then we return to
* sequential port allocation. We return to random allocation only
* once we drop below ipport_randomcps for at least 5 seconds.
* once we drop below ipport_randomcps for at least ipport_randomtime
* seconds.
*/
void