pipex_gre_header
struct pipex_gre_header *gre = NULL;
struct pipex_gre_header *);
cp = PIPEX_SEEK_NEXTHDR(gre, sizeof(struct pipex_gre_header),u_char *);
struct pipex_gre_header gre;
struct pipex_gre_header *gre;
gre = PIPEX_SEEK_NEXTHDR(ip, hlen, struct pipex_gre_header *);
cp = PIPEX_SEEK_NEXTHDR(gre, sizeof(struct pipex_gre_header),u_char *);
struct pipex_gre_header gre;
m_copydata(m0, 0, sizeof(struct pipex_gre_header), &gre);
struct pipex_gre_header *gre, gre0;
len = sizeof(struct pipex_gre_header);
gre = mtod(m0, struct pipex_gre_header *);
cp = PIPEX_SEEK_NEXTHDR(gre, sizeof(struct pipex_gre_header), u_char *);
#define PIPEX_IPGRE_HDRLEN (sizeof(struct ip) + sizeof(struct pipex_gre_header))