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Message-Id: <1496379208-30573-1-git-send-email-roopa@cumulusnetworks.com>
Date: Thu, 1 Jun 2017 21:53:28 -0700
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: stephen@...workplumber.org
Cc: netdev@...r.kernel.org, dsahern@...il.com,
nikolay@...ulusnetworks.com
Subject: [PATCH iproute2] iproute: extend route get to return matching fib route
From: Roopa Prabhu <roopa@...ulusnetworks.com>
Uses newly introduced RTM_GETROUTE flag RTM_F_FIB_MATCH
to return a matching fib route. Introduces 'fibmatch'
keyword to ip route get.
ipv4:
----
$ip route show
default via 192.168.0.2 dev eth0
10.0.14.0/24
nexthop via 172.16.0.3 dev dummy0 weight 1
nexthop via 172.16.1.3 dev dummy1 weight 1
$ip route get 10.0.14.2
10.0.14.2 via 172.16.1.3 dev dummy1 src 172.16.1.1
cache
$ip route get fibmatch 10.0.14.2
10.0.14.0/24
nexthop via 172.16.0.3 dev dummy0 weight 1
nexthop via 172.16.1.3 dev dummy1 weight 1
ipv6:
----
$ip -6 route show
2001:db9:100::/120 metric 1024
nexthop via 2001:db8:2::2 dev dummy0 weight 1
nexthop via 2001:db8:12::2 dev dummy1 weight 1
$ip -6 route get 2001:db9:100::1
2001:db9:100::1 from :: via 2001:db8:12::2 dev dummy1 \
src 2001:db8:12::1 metric 1024 pref medium
$ip -6 route get fibmatch 2001:db9:100::1
2001:db9:100::/120 metric 1024
nexthop via 2001:db8:12::2 dev dummy1 weight 1
nexthop via 2001:db8:2::2 dev dummy0 weight 1
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
include/linux/rtnetlink.h | 1 +
ip/iproute.c | 9 ++++++++-
man/man8/ip-route.8.in | 12 ++++++++++++
3 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index a96db83..3035741 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -278,6 +278,7 @@ enum rt_scope_t {
#define RTM_F_EQUALIZE 0x400 /* Multipath equalizer: NI */
#define RTM_F_PREFIX 0x800 /* Prefix addresses */
#define RTM_F_LOOKUP_TABLE 0x1000 /* set rtm_table to FIB lookup result */
+#define RTM_F_FIB_MATCH 0x2000 /* get fib match support */
/* Reserved table identifiers */
diff --git a/ip/iproute.c b/ip/iproute.c
index b4ca291..1b9c903 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -65,7 +65,8 @@ static void usage(void)
fprintf(stderr, " ip route save SELECTOR\n");
fprintf(stderr, " ip route restore\n");
fprintf(stderr, " ip route showdump\n");
- fprintf(stderr, " ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
+ fprintf(stderr, " ip route get [ ROUTE_GET_FLAGS ] ADDRESS\n");
+ fprintf(stderr, " [ from ADDRESS iif STRING ]\n");
fprintf(stderr, " [ oif STRING ] [ tos TOS ]\n");
fprintf(stderr, " [ mark NUMBER ] [ vrf NAME ]\n");
fprintf(stderr, " [ uid NUMBER ]\n");
@@ -103,6 +104,7 @@ static void usage(void)
fprintf(stderr, "ENCAPHDR := [ MPLSLABEL | SEG6HDR ]\n");
fprintf(stderr, "SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n");
fprintf(stderr, "SEGMODE := [ encap | inline ]\n");
+ fprintf(stderr, "ROUTE_GET_FLAGS := [ fibmatch ]\n");
exit(-1);
}
@@ -1674,6 +1676,7 @@ static int iproute_get(int argc, char **argv)
char *idev = NULL;
char *odev = NULL;
int connected = 0;
+ int fib_match = 0;
int from_ok = 0;
unsigned int mark = 0;
@@ -1728,6 +1731,8 @@ static int iproute_get(int argc, char **argv)
if (get_unsigned(&uid, *argv, 0))
invarg("invalid UID\n", *argv);
addattr32(&req.n, sizeof(req), RTA_UID, uid);
+ } else if (matches(*argv, "fibmatch") == 0) {
+ fib_match = 1;
} else {
inet_prefix addr;
@@ -1776,6 +1781,8 @@ static int iproute_get(int argc, char **argv)
req.r.rtm_family = AF_INET;
req.r.rtm_flags |= RTM_F_LOOKUP_TABLE;
+ if (fib_match)
+ req.r.rtm_flags |= RTM_F_FIB_MATCH;
if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
return -2;
diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index c8eb38a..de8d360 100644
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -28,6 +28,7 @@ ip-route \- routing table management
.ti -8
.B ip route get
+.I ROUTE_GET_FLAGS
.IR ADDRESS " [ "
.BI from " ADDRESS " iif " STRING"
.RB " ] [ " oif
@@ -219,6 +220,12 @@ throw " | " unreachable " | " prohibit " | " blackhole " | " nat " ]"
.B hmac
.IR KEYID " ]"
+.ti -8
+.IR ROUTE_GET_FLAGS " := "
+.BR " [ "
+.BR fibmatch
+.BR " ] "
+
.SH DESCRIPTION
.B ip route
is used to manipulate entries in the kernel routing tables.
@@ -930,6 +937,11 @@ this command gets a single route to a destination and prints its
contents exactly as the kernel sees it.
.TP
+.BI fibmatch
+Return full fib lookup matched route. Default is to return the resolved
+dst entry
+
+.TP
.BI to " ADDRESS " (default)
the destination address.
--
2.1.4
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