iprule: add oif classification support

David Miller wrote:
> From: Patrick McHardy <kaber@trash.net>
> Date: Mon, 30 Nov 2009 19:00:14 +0100
>
>> This patch contains iproute support for iprule oif classification
>> for the send-to-self RFC I just sent out.
>
> Patrick, you need to submit a new version of this patch with
> the FIB_RULE_* macro fixed, just like the kernel version got
> fixed.

Thanks for reminind me of this. New patch attached.

commit 0fe5164cbaa1d65dda341075710be71bf1f32d10
Author: Patrick McHardy <kaber@trash.net>
Date:   Fri Dec 4 07:06:18 2009 +0100

    iprule: add oif classification support
Signed-off-by: Patrick McHardy <kaber@trash.net>

ip/iprule.c

@@ -34,7 +34,7 @@ static void usage(void)
 {
 	fprintf(stderr, "Usage: ip rule [ list | add | del | flush ] SELECTOR ACTION\n");
 	fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
-	fprintf(stderr, "            [ dev STRING ] [ pref NUMBER ]\n");
+	fprintf(stderr, "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ]\n");
 	fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
 	fprintf(stderr, "          [ prohibit | reject | unreachable ]\n");
 	fprintf(stderr, "          [ realms [SRCREALM/]DSTREALM ]\n");
@@ -142,7 +142,13 @@ int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 
 	if (tb[FRA_IFNAME]) {
 		fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[FRA_IFNAME]));
-		if (r->rtm_flags & FIB_RULE_DEV_DETACHED)
+		if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
+			fprintf(fp, "[detached] ");
+	}
+
+	if (tb[FRA_OIFNAME]) {
+		fprintf(fp, "oif %s ", (char*)RTA_DATA(tb[FRA_OIFNAME]));
+		if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
 			fprintf(fp, "[detached] ");
 	}
 
@@ -307,6 +313,9 @@ static int iprule_modify(int cmd, int argc, char **argv)
 			   strcmp(*argv, "iif") == 0) {
 			NEXT_ARG();
 			addattr_l(&req.n, sizeof(req), FRA_IFNAME, *argv, strlen(*argv)+1);
+		} else if (strcmp(*argv, "oif") == 0) {
+			NEXT_ARG();
+			addattr_l(&req.n, sizeof(req), FRA_OIFNAME, *argv, strlen(*argv)+1);
 		} else if (strcmp(*argv, "nat") == 0 ||
 			   matches(*argv, "map-to") == 0) {
 			NEXT_ARG();

man/man8/ip.8

@@ -240,7 +240,9 @@ throw " | " unreachable " | " prohibit " | " blackhole " | " nat " ]"
 .IR TOS " ] [ "
 .B  fwmark
 .IR FWMARK[/MASK] " ] [ "
-.B  dev
+.B  iif
+.IR STRING " ] [ "
+.B  oif
 .IR STRING " ] [ "
 .B  pref
 .IR NUMBER " ]"
@@ -1935,6 +1937,12 @@ the rule only matches packets originating from this host.  This means
 that you may create separate routing tables for forwarded and local
 packets and, hence, completely segregate them.
 
+.TP
+.BI oif " NAME"
+select the outgoing device to match.  The outgoing interface is only
+available for packets originating from local sockets that are bound to
+a device.
+
 .TP
 .BI tos " TOS"
 .TP