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Add initrwnd to iproute2 

Add initrwnd option parsing to iproute. This option uses the new
rtnetlink init_rcvwnd to set the TCP initial receive window size
advertised by passive and active TCP connections.

Signed-off-by: Laurent Chavey <chavey@google.com>
This commit is contained in:
laurent chavey 2009-12-15 13:05:15 +00:00 committed by Stephen Hemminger
parent f703129d34
commit f5fd80039f
2 changed files with 19 additions and 1 deletions
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7
doc/ip-cref.tex
View File

@ -1336,6 +1336,13 @@ peers are allowed to send to us.
MSS (``Maximal Segment Size'') for same connection. The default is
zero, meaning to use the values specified in~\cite{RFC2414}.
+\item \verb|initrwnd NUMBER|
+--- [2.6.33+ only] Initial receive window size for connections to
+ this destination. The actual window size is this value multiplied
+ by the MSS (''Maximal Segment Size'') of the connection. The default
+ value is zero, meaning to use Slow Start value.
\item \verb|nexthop NEXTHOP|
--- the nexthop of a multipath route. \verb|NEXTHOP| is a complex value

13
ip/iproute.c
View File

@ -46,6 +46,7 @@ static const char *mx_names[RTAX_MAX+1] = {
[RTAX_INITCWND] = "initcwnd",
[RTAX_FEATURES] = "features",
[RTAX_RTO_MIN] = "rto_min",
[RTAX_INITRWND] = "initrwnd",
};
static void usage(void) __attribute__((noreturn));
@ -68,7 +69,7 @@ static void usage(void)
fprintf(stderr, " [ rtt TIME ] [ rttvar TIME ] [reordering NUMBER ]\n");
fprintf(stderr, " [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
fprintf(stderr, " [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
fprintf(stderr, " [ rto_min TIME ] [ hoplimit NUMBER ] \n");
fprintf(stderr, " [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
fprintf(stderr, " unreachable | prohibit | blackhole | nat ]\n");
fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
@ -844,6 +845,16 @@ int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
if (get_unsigned(&win, *argv, 0))
invarg("\"initcwnd\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
} else if (matches(*argv, "initrwnd") == 0) {
unsigned win;
NEXT_ARG();
if (strcmp(*argv, "lock") == 0) {
mxlock |= (1<<RTAX_INITRWND);
NEXT_ARG();
}
if (get_unsigned(&win, *argv, 0))
invarg("\"initrwnd\" value is invalid\n", *argv);
rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
} else if (matches(*argv, "rttvar") == 0) {
unsigned win;
NEXT_ARG();