iprule: add oif classification support

[Patrick McHardy <kaber@trash.net>]

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This patch contains iproute support for iprule oif classification
for the send-to-self RFC I just sent out.



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commit ba680d5d5cbd7497feee2d3045b06b9062d15a70
Author: Patrick McHardy <kaber@trash.net>
Date:   Mon Nov 30 19:06:38 2009 +0100

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

diff --git a/include/linux/fib_rules.h b/include/linux/fib_rules.h
index 87b606b..625f019 100644
--- a/include/linux/fib_rules.h
+++ b/include/linux/fib_rules.h
@@ -8,7 +8,9 @@
 #define FIB_RULE_PERMANENT	0x00000001
 #define FIB_RULE_INVERT		0x00000002
 #define FIB_RULE_UNRESOLVED	0x00000004
-#define FIB_RULE_DEV_DETACHED	0x00000008
+#define FIB_RULE_IIF_DETACHED	0x00000008
+#define FIB_RULE_DEV_DETACHED	FIB_RULE_DEV_DETACHED
+#define FIB_RULE_OIF_DETACHED	0x00000010
 
 /* try to find source address in routing lookups */
 #define FIB_RULE_FIND_SADDR	0x00010000
@@ -33,7 +35,8 @@ enum
 	FRA_UNSPEC,
 	FRA_DST,	/* destination address */
 	FRA_SRC,	/* source address */
-	FRA_IFNAME,	/* interface name */
+	FRA_IIFNAME,	/* interface name */
+#define FRA_IFNAME	FRA_IIFNAME
 	FRA_GOTO,	/* target to jump to (FR_ACT_GOTO) */
 	FRA_UNUSED2,
 	FRA_PRIORITY,	/* priority/preference */
@@ -47,6 +50,7 @@ enum
 	FRA_UNUSED8,
 	FRA_TABLE,	/* Extended table id */
 	FRA_FWMASK,	/* mask for netfilter mark */
+	FRA_OIFNAME,
 	__FRA_MAX
 };
 
diff --git a/ip/iprule.c b/ip/iprule.c
index e1a943a..9d4c9ae 100644
--- a/ip/iprule.c
+++ b/ip/iprule.c
@@ -38,7 +38,7 @@ 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");
@@ -146,7 +146,13 @@ 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] ");
 	}
 
@@ -311,6 +317,9 @@ 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();
diff --git a/man/man8/ip.8 b/man/man8/ip.8
index a8fccc4..fab337d 100644
--- a/man/man8/ip.8
+++ b/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 " ]"
@@ -1936,6 +1938,12 @@ 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
 .BI dsfield " TOS"