attr: mark nested attributes as NLA_F_NESTED
Kernel 5.2 is adding stricter checking for netlink messages.
In particular, for certain API it checks now that NLA_F_NESTED flag is
set for nested attributes ([1]).
Do like libmnl, which always adds this flag ([2]). So we should do
that as well.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b424e432e770d6dd572765459d5b6a96a19c5286
[2] https://git.netfilter.org/libmnl/tree/src/attr.c?id=5937dfcb0185f5cb9cf275992ea701ec4e619d9c#n535
Bug: https://issuetracker.google.com/150744338
Test: treehugger
Change-Id: I9012d820ed72b13d4562e144c48bc7003d621f09
diff --git a/lib/attr.c b/lib/attr.c
index bdf3c0f..a76a284 100644
--- a/lib/attr.c
+++ b/lib/attr.c
@@ -796,7 +796,7 @@
{
struct nlattr *start = (struct nlattr *) nlmsg_tail(msg->nm_nlh);
- if (nla_put(msg, attrtype, 0, NULL) < 0)
+ if (nla_put(msg, NLA_F_NESTED | attrtype, 0, NULL) < 0)
return NULL;
NL_DBG(2, "msg %p: attr <%p> %d: starting nesting\n",
