netdev - [PATCH iproute2 6/6] ip route: Add support for vrf keyword

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Date:	Tue, 14 Jun 2016 13:59:32 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	netdev@...r.kernel.org
Cc:	David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH iproute2 6/6] ip route: Add support for vrf keyword

Add vrf keyword to 'ip route' commands. Allows:
1. Users can list routes by VRF name:
       $ ip route show vrf NAME

   VRF tables have all routes including local and broadcast routes.
   The VRF keyword filters LOCAL and BROADCAST routes; to see all
   routes the table option can be used. Or to see local routes only
   for a VRF:
       $ ip route show vrf NAME type local

   Contrast with current syntax:
       $ ip route show table ID

   where the user needs to find the vrf to table ID or maintain a
   text file in /etc/iproute2/rt_tables.d.

2. Add or delete a route for a VRF:
       $ ip route {add|delete} vrf NAME <route spec>

   Similarly for this command, users currently need to use table
   option and know the table id or maintain a mapping.

3. Do a route lookup for a VRF:
       $ ip route get vrf NAME ADDRESS

   Contrast with current syntax:
       $ ip route get oif DEV ADDRESS

   (specifying table id for route get does not work kernel side).

Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
---
 ip/iproute.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/ip/iproute.c b/ip/iproute.c
index aae693d17be8..bd661c16cb46 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -67,10 +67,10 @@ static void usage(void)
 	fprintf(stderr, "       ip route showdump\n");
 	fprintf(stderr, "       ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
 	fprintf(stderr, "                            [ oif STRING ] [ tos TOS ]\n");
-	fprintf(stderr, "                            [ mark NUMBER ]\n");
+	fprintf(stderr, "                            [ mark NUMBER ] [ vrf NAME ]\n");
 	fprintf(stderr, "       ip route { add | del | change | append | replace } ROUTE\n");
 	fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
-	fprintf(stderr, "            [ table TABLE_ID ] [ proto RTPROTO ]\n");
+	fprintf(stderr, "            [ table TABLE_ID ] [ vrf NAME ] [ proto RTPROTO ]\n");
 	fprintf(stderr, "            [ type TYPE ] [ scope SCOPE ]\n");
 	fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
 	fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
@@ -1141,6 +1141,20 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
 				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
 			}
 			table_ok = 1;
+		} else if (matches(*argv, "vrf") == 0) {
+			__u32 tid;
+
+			NEXT_ARG();
+			tid = ipvrf_get_table(*argv);
+			if (tid == 0)
+				invarg("Invalid VRF\n", *argv);
+			if (tid < 256)
+				req.r.rtm_table = tid;
+			else {
+				req.r.rtm_table = RT_TABLE_UNSPEC;
+				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
+			}
+			table_ok = 1;
 		} else if (strcmp(*argv, "dev") == 0 ||
 			   strcmp(*argv, "oif") == 0) {
 			NEXT_ARG();
@@ -1395,6 +1409,15 @@ static int iproute_list_flush_or_save(int argc, char **argv, int action)
 				}
 			} else
 				filter.tb = tid;
+		} else if (matches(*argv, "vrf") == 0) {
+			__u32 tid;
+
+			NEXT_ARG();
+			tid = ipvrf_get_table(*argv);
+			if (tid == 0)
+				invarg("Invalid VRF\n", *argv);
+			filter.tb = tid;
+			filter.typemask = ~(1 << RTN_LOCAL | 1<<RTN_BROADCAST);
 		} else if (matches(*argv, "cached") == 0 ||
 			   matches(*argv, "cloned") == 0) {
 			filter.cloned = 1;
@@ -1681,6 +1704,11 @@ static int iproute_get(int argc, char **argv)
 			req.r.rtm_flags |= RTM_F_NOTIFY;
 		} else if (matches(*argv, "connected") == 0) {
 			connected = 1;
+		} else if (matches(*argv, "vrf") == 0) {
+			NEXT_ARG();
+			if (!name_is_vrf(*argv))
+				invarg("Invalid VRF\n", *argv);
+			odev = *argv;
 		} else {
 			inet_prefix addr;
 
-- 
2.1.4