1*5162Swnj /* ip_var.h 4.5 81/12/02 */ 24893Swnj 34893Swnj /* 44893Swnj * Overlay for ip header used by other protocols (tcp, udp). 54893Swnj */ 64893Swnj struct ipovly { 74899Swnj caddr_t ih_next, ih_prev; /* for protocol sequence q's */ 84899Swnj u_char ih_x1; /* (unused) */ 94899Swnj u_char ih_pr; /* protocol */ 104924Swnj short ih_len; /* protocol length */ 114924Swnj struct in_addr ih_src; /* source internet address */ 124924Swnj struct in_addr ih_dst; /* destination internet address */ 134893Swnj }; 144893Swnj 154893Swnj /* 164893Swnj * Ip reassembly queue structure. Each fragment 174893Swnj * being reassembled is attached to one of these structures. 184893Swnj * They are timed out after ipq_ttl drops to 0, and may also 194893Swnj * be reclaimed if memory becomes tight. 204893Swnj */ 214893Swnj struct ipq { 224893Swnj struct ipq *next,*prev; /* to other reass headers */ 234893Swnj u_char ipq_ttl; /* time for reass q to live */ 244893Swnj u_char ipq_p; /* protocol of this fragment */ 254893Swnj u_short ipq_id; /* sequence id for reassembly */ 264893Swnj struct ipasfrag *ipq_next,*ipq_prev; 274893Swnj /* to ip headers of fragments */ 284924Swnj struct in_addr ipq_src,ipq_dst; 294893Swnj }; 304893Swnj 314893Swnj /* 324893Swnj * Ip header, when holding a fragment. 334893Swnj */ 344893Swnj struct ipasfrag { 354893Swnj u_char ip_hl:4, 364893Swnj ip_v:4; 374893Swnj u_char ipf_mff; /* copied from (ip_off&IP_MF) */ 384893Swnj short ip_len; 394893Swnj u_short ip_id; 404893Swnj short ip_off; 414893Swnj u_char ip_ttl; 424893Swnj u_char ip_p; 434893Swnj u_short ip_sum; 444899Swnj struct ipasfrag *ipf_next; /* next fragment */ 454899Swnj struct ipasfrag *ipf_prev; /* previous fragment */ 464893Swnj }; 474893Swnj 484924Swnj struct ipstat { 49*5162Swnj int ips_badsum; /* checksum bad */ 50*5162Swnj int ips_tooshort; /* packet too short */ 514924Swnj }; 524924Swnj 534893Swnj #ifdef KERNEL 544924Swnj struct ipstat ipstat; 554893Swnj struct ipq ipq; /* ip reass. queue */ 564893Swnj struct ipq *ip_freef(); 574893Swnj u_short ip_id; /* ip packet ctr, for ids */ 584893Swnj #endif 59