netdev - [PATCH iproute2 1/6] ip vrf: Add name_is

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Message-Id: <1465937972-25011-2-git-send-email-dsa@cumulusnetworks.com>
Date:	Tue, 14 Jun 2016 13:59:27 -0700
From:	David Ahern <dsa@...ulusnetworks.com>
To:	netdev@...r.kernel.org
Cc:	David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH iproute2 1/6] ip vrf: Add name_is_vrf

Add name_is_vrf function to determine if given name corresponds to a
VRF device.

Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
---
 ip/ip_common.h  |  2 ++
 ip/iplink_vrf.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/ip/ip_common.h b/ip/ip_common.h
index e8da9e034b15..410eb135774a 100644
--- a/ip/ip_common.h
+++ b/ip/ip_common.h
@@ -90,6 +90,8 @@ struct link_util *get_link_slave_kind(const char *slave_kind);
 
 void br_dump_bridge_id(const struct ifla_bridge_id *id, char *buf, size_t len);
 
+bool name_is_vrf(char *name);
+
 #ifndef	INFINITY_LIFE_TIME
 #define     INFINITY_LIFE_TIME      0xFFFFFFFFU
 #endif
diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c
index e3c7b4652da5..abd43c08423e 100644
--- a/ip/iplink_vrf.c
+++ b/ip/iplink_vrf.c
@@ -96,3 +96,56 @@ struct link_util vrf_slave_link_util = {
 	.print_opt	= vrf_slave_print_opt,
 	.slave          = true,
 };
+
+bool name_is_vrf(char *name)
+{
+	struct {
+		struct nlmsghdr		n;
+		struct ifinfomsg	i;
+		char			buf[1024];
+	} req = {
+		.n = {
+			.nlmsg_len   = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+			.nlmsg_flags = NLM_F_REQUEST,
+			.nlmsg_type  = RTM_GETLINK,
+		},
+		.i = {
+			.ifi_family  = preferred_family,
+		},
+	};
+	struct {
+		struct nlmsghdr n;
+		char buf[8192];
+	} answer;
+	struct rtattr *tb[IFLA_MAX+1];
+	struct rtattr *li[IFLA_INFO_MAX+1];
+	struct ifinfomsg *ifi;
+	int len;
+
+	addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
+
+	if (rtnl_talk(&rth, &req.n, &answer.n, sizeof(answer)) < 0)
+		goto err;
+
+	ifi = NLMSG_DATA(&answer.n);
+	len = answer.n.nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
+	if (len < 0) {
+		fprintf(stderr, "BUG: Invalid response to link query.\n");
+		goto err;
+	}
+
+	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
+
+	if (!tb[IFLA_LINKINFO])
+		goto err;
+
+	parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
+
+	if (!li[IFLA_INFO_KIND])
+		goto err;
+
+	return strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf") == 0;
+
+err:
+	return false;
+}
-- 
2.1.4