ip link: Add support for kernel side filtering
Kernel gained support for filtering link dumps with commit dc599f76c22b
("net: Add support for filtering link dump by master device and kind").
Add support to ip link command. If a user passes master device or
kind to ip link command they are added to the link dump request message.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index a90e52c..0adcbf3 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -129,6 +129,34 @@
return send(rth->fd, (void*)&req, sizeof(req), 0);
}
+int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int family, int type,
+ req_filter_fn_t filter_fn)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ifinfomsg ifm;
+ char buf[1024];
+ } req;
+ int err;
+
+ if (!filter_fn)
+ return -EINVAL;
+
+ memset(&req, 0, sizeof(req));
+ req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ req.nlh.nlmsg_type = type;
+ req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
+ req.nlh.nlmsg_pid = 0;
+ req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
+ req.ifm.ifi_family = family;
+
+ err = filter_fn(&req.nlh, sizeof(req));
+ if (err)
+ return err;
+
+ return send(rth->fd, (void*)&req, sizeof(req), 0);
+}
+
int rtnl_send(struct rtnl_handle *rth, const void *buf, int len)
{
return send(rth->fd, buf, len, 0);