/* ip_var.h 4.9 83/02/23 */ /* * Overlay for ip header used by other protocols (tcp, udp). */ struct ipovly { caddr_t ih_next, ih_prev; /* for protocol sequence q's */ u_char ih_x1; /* (unused) */ u_char ih_pr; /* protocol */ short ih_len; /* protocol length */ struct in_addr ih_src; /* source internet address */ struct in_addr ih_dst; /* destination internet address */ }; /* * Ip reassembly queue structure. Each fragment * being reassembled is attached to one of these structures. * They are timed out after ipq_ttl drops to 0, and may also * be reclaimed if memory becomes tight. */ struct ipq { struct ipq *next,*prev; /* to other reass headers */ u_char ipq_ttl; /* time for reass q to live */ u_char ipq_p; /* protocol of this fragment */ u_short ipq_id; /* sequence id for reassembly */ struct ipasfrag *ipq_next,*ipq_prev; /* to ip headers of fragments */ struct in_addr ipq_src,ipq_dst; }; /* * Ip header, when holding a fragment. * * Note: ipf_next must be at same offset as ipq_next above */ struct ipasfrag { #ifdef vax u_char ip_hl:4, ip_v:4; #endif #ifdef sun u_char ip_v:4, ip_hl:4; #endif u_char ipf_mff; /* copied from (ip_off&IP_MF) */ short ip_len; u_short ip_id; short ip_off; u_char ip_ttl; u_char ip_p; u_short ip_sum; struct ipasfrag *ipf_next; /* next fragment */ struct ipasfrag *ipf_prev; /* previous fragment */ }; struct ipstat { int ips_badsum; /* checksum bad */ int ips_tooshort; /* packet too short */ int ips_toosmall; /* not enough data */ int ips_badhlen; /* ip header length < data size */ int ips_badlen; /* ip length < ip header length */ }; #ifdef KERNEL struct ipstat ipstat; struct ipq ipq; /* ip reass. queue */ u_short ip_id; /* ip packet ctr, for ids */ #endif