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>
diff --git a/doc/ip-cref.tex b/doc/ip-cref.tex
index 7bb562e..056e3bf 100644
--- a/doc/ip-cref.tex
+++ b/doc/ip-cref.tex
@@ -1336,6 +1336,13 @@
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
diff --git a/ip/iproute.c b/ip/iproute.c
index 1d73ab8..8252e18 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -46,6 +46,7 @@
[RTAX_INITCWND] = "initcwnd",
[RTAX_FEATURES] = "features",
[RTAX_RTO_MIN] = "rto_min",
+ [RTAX_INITRWND] = "initrwnd",
};
static void usage(void) __attribute__((noreturn));
@@ -68,7 +69,7 @@
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 @@
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();