netdev - [PATCH iproute2 v3] vxlan: Allow setting destination to unicast address.

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Date:	Fri, 12 Apr 2013 18:09:17 +0900
From:	Atzm Watanabe <atzm@...atosphere.co.jp>
To:	netdev@...r.kernel.org
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	David Miller <davem@...emloft.net>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: [PATCH iproute2 v3] vxlan: Allow setting destination to unicast address.

This patch allows setting VXLAN destination to unicast address.
It allows that VXLAN can be used as peer-to-peer tunnel without
multicast.

v3: move a new attribute REMOTE into the last of an enum list
    based by Stephen Hemminger's comments.
    fix the usage to show explicitly that both "remote" and "group"
    cannot be specified, based by Ben Hutchings's comments.

v2: use a new argument "remote" instead of "group" based by
    Stephen Hemminger's comments.

Signed-off-by: Atzm Watanabe <atzm@...atosphere.co.jp>
---
 include/linux/if_link.h |  1 +
 ip/iplink_vxlan.c       | 25 +++++++++++++++++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index 40167af..3a7f7b9 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -306,6 +306,7 @@ enum {
 	IFLA_VXLAN_RSC,
 	IFLA_VXLAN_L2MISS,
 	IFLA_VXLAN_L3MISS,
+	IFLA_VXLAN_REMOTE,
 	__IFLA_VXLAN_MAX
 };
 #define IFLA_VXLAN_MAX	(__IFLA_VXLAN_MAX - 1)
diff --git a/ip/iplink_vxlan.c b/ip/iplink_vxlan.c
index 1025326..52a2c6b 100644
--- a/ip/iplink_vxlan.c
+++ b/ip/iplink_vxlan.c
@@ -23,7 +23,8 @@
 
 static void explain(void)
 {
-	fprintf(stderr, "Usage: ... vxlan id VNI [ group ADDR ] [ local ADDR ]\n");
+	fprintf(stderr, "Usage: ... vxlan id VNI [ { group | remote } ADDR ]\n");
+	fprintf(stderr, "                 [ local ADDR ]\n");
 	fprintf(stderr, "                 [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]\n");
 	fprintf(stderr, "                 [ port MIN MAX ] [ [no]learning ]\n");
 	fprintf(stderr, "                 [ [no]proxy ] [ [no]rsc ]\n");
@@ -41,6 +42,7 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 	__u32 vni = 0;
 	int vni_set = 0;
 	__u32 saddr = 0;
+	__u32 daddr = 0;
 	__u32 gaddr = 0;
 	unsigned link = 0;
 	__u8 tos = 0;
@@ -68,7 +70,13 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 			gaddr = get_addr32(*argv);
 
 			if (!IN_MULTICAST(ntohl(gaddr)))
-				invarg("invald group address", *argv);
+				invarg("invalid group address", *argv);
+		} else if (!matches(*argv, "remote")) {
+			NEXT_ARG();
+			daddr = get_addr32(*argv);
+
+			if (IN_MULTICAST(ntohl(daddr)))
+				invarg("invalid remote address", *argv);
 		} else if (!matches(*argv, "local")) {
 			NEXT_ARG();
 			if (strcmp(*argv, "any"))
@@ -160,9 +168,15 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 		fprintf(stderr, "vxlan: missing virtual network identifier\n");
 		return -1;
 	}
+	if (gaddr && daddr) {
+		fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
+		return -1;
+	}
 	addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 	if (gaddr)
 		addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
+	else if (daddr)
+		addattr_l(n, 1024, IFLA_VXLAN_REMOTE, &daddr, 4);
 	if (saddr)
 		addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 	if (link)
@@ -213,6 +227,13 @@ static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 				format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 	}
 
+	if (tb[IFLA_VXLAN_REMOTE]) {
+		__be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_REMOTE]);
+		if (addr)
+			fprintf(f, "remote %s ",
+				format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
+	}
+
 	if (tb[IFLA_VXLAN_LOCAL]) {
 		__be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 		if (addr)
-- 
1.8.1.5

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