linux-kernel - a question about netlink?

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Message-ID: <54A83BDB1B497D429FE6D4D3A6E5C5C919150531@fzex.ruijie.com.cn>
Date:	Fri, 17 Dec 2010 03:29:13 +0000
From:	林嘉(研七 福州) <linjia@...jie.com.cn>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: a question about netlink?

in af_netlink.c

do_one_broadcast
{
         if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups ||
             !test_bit(p->group - 1, nlk->groups))
                   goto out;
}

why here write:" p->group - 1 >= nlk->ngroups" but not " p->group > nlk->ngroups " , or " (p->group & nlk->ngroups) != 0 "

I think the message is only sento nlk whoes groups 'p->group' bit is set.