From 39648eeaf08ca5e8b12626362fc3dcbe4ae59193 Mon Sep 17 00:00:00 2001
From: Przemyslaw Czarnota <przemyslawx.czarnota@intel.com>
Date: Mon, 23 Jul 2018 15:42:15 +0200
Subject: [06/17] link: add rtnl_link_foreach

Adds rtnl_link_foreach, which allows to iterate over all network
interfaces
---
 include/netlink/route/link.h |  3 +++
 lib/route/link.c             | 25 +++++++++++++++++++++++++
 libnl-route-3.sym            |  1 +
 3 files changed, 29 insertions(+)

diff --git a/include/netlink/route/link.h b/include/netlink/route/link.h
index 5f941d5..21cf2af 100644
--- a/include/netlink/route/link.h
+++ b/include/netlink/route/link.h
@@ -116,6 +116,9 @@ extern int	rtnl_link_alloc_cache_flags(struct nl_sock *, int,
 extern struct rtnl_link *rtnl_link_get(struct nl_cache *, int);
 extern struct rtnl_link *rtnl_link_get_by_name(struct nl_cache *, const char *);
 
+extern void rtnl_link_foreach(struct nl_cache *,
+		       void (*callback)(struct rtnl_link *, void *),
+		       void *);
 
 extern int	rtnl_link_build_add_request(struct rtnl_link *, int,
 					    struct nl_msg **);
diff --git a/lib/route/link.c b/lib/route/link.c
index 4840c23..2379521 100644
--- a/lib/route/link.c
+++ b/lib/route/link.c
@@ -1331,6 +1331,31 @@ struct rtnl_link *rtnl_link_get_by_name(struct nl_cache *cache,
 	return NULL;
 }
 
+/**
+ * Iterate over all entries in link cache
+ * @arg cache		Link cache
+ * @arg callback	Callback called for each link
+ * @arg ctx		Callback context
+ *
+ * Iterates over all links in link cache. Calls callback for each link
+ *
+ * @route_doc{link_list, Iterate over all Links}
+ * @see rtnl_link_get_by_name()
+ */
+void rtnl_link_foreach(struct nl_cache *cache,
+		       void (*callback)(struct rtnl_link *link, void *ctx),
+		       void *ctx)
+{
+	struct rtnl_link *link;
+
+	if (cache->c_ops != &rtnl_link_ops)
+		return;
+
+	nl_list_for_each_entry(link, &cache->c_items, ce_list) {
+		callback(link, ctx);
+	}
+}
+
 /**
  * Construct RTM_GETLINK netlink message
  * @arg ifindex		Interface index
diff --git a/libnl-route-3.sym b/libnl-route-3.sym
index 0d54d66..361a03c 100644
--- a/libnl-route-3.sym
+++ b/libnl-route-3.sym
@@ -280,6 +280,7 @@ global:
 	rtnl_link_enslave_ifindex;
 	rtnl_link_fill_info;
 	rtnl_link_flags2str;
+	rtnl_link_foreach;
 	rtnl_link_gem_alloc;
 	rtnl_link_gem_get_id;
 	rtnl_link_gem_get_index;
-- 
2.17.1