[PATCH 1/3] libnetlink: add rtattr_for_each_nested() iteration macro
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2020-08-24 17:51:32
Also in:
linux-wireless
Subsystem:
the rest · Maintainer:
Linus Torvalds
This is useful for iterating elements in a nested attribute, if they're not parsed with a strict length limit or such. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> --- include/libnetlink.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index e27516f7648f..0d4a9f29afbd 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h@@ -284,4 +284,9 @@ int rtnl_from_file(FILE *, rtnl_listen_filter_t handler, * messages from dump file */ #define NLMSG_TSTAMP 15 +#define rtattr_for_each_nested(attr, nest) \ + for ((attr) = (void *)RTA_DATA(nest); \ + RTA_OK(attr, RTA_PAYLOAD(nest) - ((char *)(attr) - (char *)RTA_DATA((nest)))); \ + (attr) = RTA_TAIL((attr))) + #endif /* __LIBNETLINK_H__ */
--
2.26.2