From: David Ahern <dsahern@gmail.com>
Date: Mon, 31 Dec 2018 17:54:47 +0000 (-0800)
Subject: libnetlink: Add filter function to rtnl_neighdump_req
X-Git-Tag: v5.0.0~36^2~2^2~4
X-Git-Url: https://git.proxmox.com/?p=mirror_iproute2.git;a=commitdiff_plain;h=f255ab122537992e522abd29333084ca434b0a61

libnetlink: Add filter function to rtnl_neighdump_req

Add filter function to rtnl_neighdump_req and a buffer to the
request for the filter functions to append attributes.

Signed-off-by: David Ahern <dsahern@gmail.com>
---

diff --git a/include/libnetlink.h b/include/libnetlink.h
index dc0c9c4e..14895151 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -60,7 +60,8 @@ int rtnl_routedump_req(struct rtnl_handle *rth, int family,
 	__attribute__((warn_unused_result));
 int rtnl_ruledump_req(struct rtnl_handle *rth, int family)
 	__attribute__((warn_unused_result));
-int rtnl_neighdump_req(struct rtnl_handle *rth, int family)
+int rtnl_neighdump_req(struct rtnl_handle *rth, int family,
+		       req_filter_fn_t filter_fn)
 	__attribute__((warn_unused_result));
 int rtnl_neightbldump_req(struct rtnl_handle *rth, int family)
 	__attribute__((warn_unused_result));
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index 4d7d0810..19318b44 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -327,11 +327,13 @@ int rtnl_ruledump_req(struct rtnl_handle *rth, int family)
 	return send(rth->fd, &req, sizeof(req), 0);
 }
 
-int rtnl_neighdump_req(struct rtnl_handle *rth, int family)
+int rtnl_neighdump_req(struct rtnl_handle *rth, int family,
+		       req_filter_fn_t filter_fn)
 {
 	struct {
 		struct nlmsghdr nlh;
 		struct ndmsg ndm;
+		char buf[256];
 	} req = {
 		.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
 		.nlh.nlmsg_type = RTM_GETNEIGH,
@@ -340,6 +342,14 @@ int rtnl_neighdump_req(struct rtnl_handle *rth, int family)
 		.ndm.ndm_family = family,
 	};
 
+	if (filter_fn) {
+		int err;
+
+		err = filter_fn(&req.nlh, sizeof(req));
+		if (err)
+			return err;
+	}
+
 	return send(rth->fd, &req, sizeof(req), 0);
 }
 
diff --git a/misc/arpd.c b/misc/arpd.c
index ce7c0997..504961cb 100644
--- a/misc/arpd.c
+++ b/misc/arpd.c
@@ -424,7 +424,7 @@ static int do_one_request(struct nlmsghdr *n)
 
 static void load_initial_table(void)
 {
-	if (rtnl_neighdump_req(&rth, AF_INET) < 0) {
+	if (rtnl_neighdump_req(&rth, AF_INET, NULL) < 0) {
 		perror("dump request failed");
 		exit(1);
 	}