why struct ip -> p_ip==0

[cyx_mail]

Hi,all

When I read the igmpproxy code ,I found a piece of code in igmp.c :

/* 
     * this is most likely a message from the kernel indicating that
     * a new src grp pair message has arrived and so, it would be 
     * necessary to install a route into the kernel for this.
     */
    if (ip->ip_p == 0) {
        if (src == 0 || dst == 0) {
            log(LOG_WARNING, 0, "kernel request not accurate");
        }

I don't know why ip->ip_p == 0 ???


2008-07-08 




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