- struct nf_ct_pptp_master *info = &nfct_help(ct)->help.ct_pptp_info;
- struct tcphdr _tcph, *tcph;
- struct pptp_pkt_hdr _pptph, *pptph;
+ const struct nf_ct_pptp_master *info = &nfct_help(ct)->help.ct_pptp_info;
+ const struct tcphdr *tcph;
+ struct tcphdr _tcph;
+ const struct pptp_pkt_hdr *pptph;
+ struct pptp_pkt_hdr _pptph;