ip vrf: Add ipvrf_get_table
Add ipvrf_get_table to lookup table id for device name. Returns 0
on any error or if name is not a VRF device.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c
index 166f566..015b41e 100644
--- a/ip/iplink_vrf.c
+++ b/ip/iplink_vrf.c
@@ -97,6 +97,69 @@
.slave = true,
};
+/* returns table id if name is a VRF device */
+__u32 ipvrf_get_table(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 rtattr *vrf_attr[IFLA_VRF_MAX + 1];
+ struct ifinfomsg *ifi;
+ __u32 tb_id = 0;
+ 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 0;
+
+ 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 0;
+ }
+
+ parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
+
+ if (!tb[IFLA_LINKINFO])
+ return 0;
+
+ parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
+
+ if (!li[IFLA_INFO_KIND] || !li[IFLA_INFO_DATA])
+ return 0;
+
+ if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
+ return 0;
+
+ parse_rtattr_nested(vrf_attr, IFLA_VRF_MAX, li[IFLA_INFO_DATA]);
+ if (vrf_attr[IFLA_VRF_TABLE])
+ tb_id = rta_getattr_u32(vrf_attr[IFLA_VRF_TABLE]);
+
+ if (!tb_id)
+ fprintf(stderr, "BUG: VRF %s is missing table id\n", name);
+
+ return tb_id;
+}
+
bool name_is_vrf(const char *name)
{
struct {