taglinefilesource code
opts_p1188net/inet/ip.cunsigned char opts_p = 0;  /* Set iff the packet has options. */
opts_p1212net/inet/ip.copts_p = 1;
opts_p1307net/inet/ip.cipprot->handler(skb2, dev, opts_p ? &opt : 0, iph->daddr,