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net: rtnetlink: add helper to extract msg type's kind

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[ Upstream commit 2e9ea3e30f696fd438319c07836422bb0bbb4608 ]

Add a helper which extracts the msg type's kind using the kind mask (0x3).

Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: bf29555f5bdc ("rtnetlink: Allow deleting FDB entries in user namespace")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nikolay Aleksandrov 2022-04-13 13:51:52 +03:00 • committed by Greg Kroah-Hartman
commit 85c154222d
2 changed files with 7 additions and 1 deletions
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6
include/net/rtnetlink.h
View file

@ -19,6 +19,12 @@ enum rtnl_kinds {
RTNL_KIND_GET,
RTNL_KIND_SET
};
#define RTNL_KIND_MASK 0x3
static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
{
return msgtype & RTNL_KIND_MASK;
}
void rtnl_register(int protocol, int msgtype,
rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);

2
net/core/rtnetlink.c
View file

@ -5212,7 +5212,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
return 0;
family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
kind = type&3;
kind = rtnl_msgtype_kind(type);
if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN))
return -EPERM;