sctp_phashfn
index = sctp_phashfn(net, rover);
head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),