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@cumulusnetworks.com>
diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c
index e3c7b46..166f566 100644
--- a/ip/iplink_vrf.c
+++ b/ip/iplink_vrf.c
@@ -96,3 +96,53 @@
.print_opt = vrf_slave_print_opt,
.slave = true,
};
+
+bool name_is_vrf(const 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)
+ return false;
+
+ 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");
+ return false;
+ }
+
+ parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
+
+ if (!tb[IFLA_LINKINFO])
+ return false;
+
+ parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
+
+ if (!li[IFLA_INFO_KIND])
+ return false;
+
+ return strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf") == 0;
+}