net: rtnetlink: add helper to extract msg type's kind
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>
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@ -19,6 +19,12 @@ enum rtnl_kinds {
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RTNL_KIND_GET,
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RTNL_KIND_SET
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};
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#define RTNL_KIND_MASK 0x3
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static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
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{
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return msgtype & RTNL_KIND_MASK;
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}
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void rtnl_register(int protocol, int msgtype,
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rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
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@ -5947,7 +5947,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
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return 0;
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family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
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kind = type&3;
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kind = rtnl_msgtype_kind(type);
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if (kind != RTNL_KIND_GET && !netlink_net_capable(skb, CAP_NET_ADMIN))
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return -EPERM;
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