pim_encap_pimhdr
mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr);
struct pim_encap_pimhdr *pimhdr;
mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr);
sizeof(pim_encap_pimhdr));
pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer
*pimhdr = pim_encap_pimhdr;
pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr));
static struct pim_encap_pimhdr pim_encap_pimhdr = {