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libnetlink: add rtattr_for_each_nested() iteration macro 

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>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Johannes Berg 2020-08-24 19:51:06 +02:00 committed by David Ahern
parent e8e8f16ed1
commit 784fa9f62f
1 changed files with 5 additions and 0 deletions
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5
include/libnetlink.h
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@ -284,4 +284,9 @@ int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
* messages from dump file */ * messages from dump file */
#define NLMSG_TSTAMP 15 #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__ */ #endif /* __LIBNETLINK_H__ */