ip: route: Add IPv6 flow label support

Allow specifying an IPv6 flow label when performing a route lookup.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David Ahern <dsahern@kernel.org>

ip/iproute.c

@@ -67,7 +67,7 @@ static void usage(void)
 		"                            [ mark NUMBER ] [ vrf NAME ]\n"
 		"                            [ uid NUMBER ] [ ipproto PROTOCOL ]\n"
 		"                            [ sport NUMBER ] [ dport NUMBER ]\n"
-		"                            [ as ADDRESS ]\n"
+		"                            [ as ADDRESS ] [ flowlabel FLOWLABEL ]\n"
 		"       ip route { add | del | change | append | replace } ROUTE\n"
 		"SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n"
 		"            [ table TABLE_ID ] [ vrf NAME ] [ proto RTPROTO ]\n"
@@ -2129,6 +2129,14 @@ static int iproute_get(int argc, char **argv)
 				invarg("Invalid \"ipproto\" value\n",
 				       *argv);
 			addattr8(&req.n, sizeof(req), RTA_IP_PROTO, ipproto);
+		} else if (strcmp(*argv, "flowlabel") == 0) {
+			__be32 flowlabel;
+
+			NEXT_ARG();
+			if (get_be32(&flowlabel, *argv, 0))
+				invarg("invalid flowlabel", *argv);
+			addattr32(&req.n, sizeof(req), RTA_FLOWLABEL,
+				  flowlabel);
 		} else {
 			inet_prefix addr;
 

man/man8/ip-route.8.in

@@ -47,7 +47,9 @@ ip-route \- routing table management
 .B  dport
 .IR NUMBER " ] ["
 .B  as
-.IR ADDRESS " ]"
+.IR ADDRESS " ] ["
+.B  flowlabel
+.IR FLOWLABEL " ]
 
 .ti -8
 .BR "ip route" " { " add " | " del " | " change " | " append " | "\
@@ -1316,6 +1318,10 @@ was given, relookup the route with the source set to the preferred
 address received from the first lookup.
 If policy routing is used, it may be a different route.
 
+.TP
+.BI flowlabel " FLOWLABEL"
+ipv6 flow label as seen by the route lookup
+
 .P
 Note that this operation is not equivalent to
 .BR "ip route show" .