grehdr_t
grehdr_t *gre;
if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
grehdr_t *gre;
ipf_pr_short(fin, sizeof(grehdr_t));
if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
grehdr_t gre;
hlen += sizeof(grehdr_t);
grehdr_t gre;