netdev - [PATCH iproute2-next] ipaddress: Add support for address metric

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Date:   Sun, 27 May 2018 08:10:00 -0700
From:   dsahern@...nel.org
To:     netdev@...r.kernel.org
Cc:     roopa@...ulusnetworks.com, David Ahern <dsahern@...il.com>
Subject: [PATCH iproute2-next] ipaddress: Add support for address metric

From: David Ahern <dsahern@...il.com>

Add support for IFA_RT_PRIORITY using the same keywords as iproute for
RTA_PRIORITY.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 include/uapi/linux/if_addr.h |  1 +
 ip/ipaddress.c               | 15 ++++++++++++++-
 man/man8/ip-address.8.in     |  6 ++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_addr.h b/include/uapi/linux/if_addr.h
index c4899e22cdaa..a924606f36e5 100644
--- a/include/uapi/linux/if_addr.h
+++ b/include/uapi/linux/if_addr.h
@@ -33,6 +33,7 @@ enum {
 	IFA_CACHEINFO,
 	IFA_MULTICAST,
 	IFA_FLAGS,
+	IFA_RT_PRIORITY,  /* u32, priority/metric for prefix route */
 	__IFA_MAX,
 };
 
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 75539e057f6a..6b53b753ead9 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -63,7 +63,7 @@ static void usage(void)
 	fprintf(stderr, "       ip address {showdump|restore}\n");
 	fprintf(stderr, "IFADDR := PREFIX | ADDR peer PREFIX\n");
 	fprintf(stderr, "          [ broadcast ADDR ] [ anycast ADDR ]\n");
-	fprintf(stderr, "          [ label IFNAME ] [ scope SCOPE-ID ]\n");
+	fprintf(stderr, "          [ label IFNAME ] [ scope SCOPE-ID ] [ metric METRIC ]\n");
 	fprintf(stderr, "SCOPE-ID := [ host | link | global | NUMBER ]\n");
 	fprintf(stderr, "FLAG-LIST := [ FLAG-LIST ] FLAG\n");
 	fprintf(stderr, "FLAG  := [ permanent | dynamic | secondary | primary |\n");
@@ -1328,6 +1328,10 @@ int print_addrinfo(const struct sockaddr_nl *who, struct nlmsghdr *n,
 							   rta_tb[IFA_ADDRESS]));
 		}
 		print_int(PRINT_ANY, "prefixlen", "/%d ", ifa->ifa_prefixlen);
+
+		if (rta_tb[IFA_RT_PRIORITY])
+			print_uint(PRINT_ANY, "metric", "metric %u ",
+				   rta_getattr_u32(rta_tb[IFA_RT_PRIORITY]));
 	}
 
 	if (brief)
@@ -2119,6 +2123,15 @@ static int ipaddr_modify(int cmd, int flags, int argc, char **argv)
 			NEXT_ARG();
 			l = *argv;
 			addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l)+1);
+		} else if (matches(*argv, "metric") == 0 ||
+			   matches(*argv, "priority") == 0 ||
+			   matches(*argv, "preference") == 0) {
+			__u32 metric;
+
+			NEXT_ARG();
+			if (get_u32(&metric, *argv, 0))
+				invarg("\"metric\" value is invalid\n", *argv);
+			addattr32(&req.n, sizeof(req), IFA_RT_PRIORITY, metric);
 		} else if (matches(*argv, "valid_lft") == 0) {
 			if (valid_lftp)
 				duparg("valid_lft", *argv);
diff --git a/man/man8/ip-address.8.in b/man/man8/ip-address.8.in
index 7ebf0bc98dcd..c3861b3725cc 100644
--- a/man/man8/ip-address.8.in
+++ b/man/man8/ip-address.8.in
@@ -27,6 +27,8 @@ ip-address \- protocol address management
 .IR IFNAME " ] [ "
 .B  scope
 .IR SCOPE-ID " ] [ "
+.B  metric
+.IR METRIC " ] [ "
 .B  to
 .IR PREFIX " ] [ " FLAG-LIST " ] [ "
 .B  label
@@ -215,6 +217,10 @@ valid inside this site.
 .in -8
 
 .TP
+.BI metric " NUMBER"
+priority of prefix route associated with address.
+
+.TP
 .BI valid_lft " LFT"
 the valid lifetime of this address; see section 5.5.4 of
 RFC 4862. When it expires, the address is removed by the kernel.
-- 
2.11.0