1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ip_var.h 7.7 (Berkeley) 06/28/90 8 */ 9 10 /* 11 * Overlay for ip header used by other protocols (tcp, udp). 12 */ 13 struct ipovly { 14 caddr_t ih_next, ih_prev; /* for protocol sequence q's */ 15 u_char ih_x1; /* (unused) */ 16 u_char ih_pr; /* protocol */ 17 short ih_len; /* protocol length */ 18 struct in_addr ih_src; /* source internet address */ 19 struct in_addr ih_dst; /* destination internet address */ 20 }; 21 22 /* 23 * Ip reassembly queue structure. Each fragment 24 * being reassembled is attached to one of these structures. 25 * They are timed out after ipq_ttl drops to 0, and may also 26 * be reclaimed if memory becomes tight. 27 */ 28 struct ipq { 29 struct ipq *next,*prev; /* to other reass headers */ 30 u_char ipq_ttl; /* time for reass q to live */ 31 u_char ipq_p; /* protocol of this fragment */ 32 u_short ipq_id; /* sequence id for reassembly */ 33 struct ipasfrag *ipq_next,*ipq_prev; 34 /* to ip headers of fragments */ 35 struct in_addr ipq_src,ipq_dst; 36 }; 37 38 /* 39 * Ip header, when holding a fragment. 40 * 41 * Note: ipf_next must be at same offset as ipq_next above 42 */ 43 struct ipasfrag { 44 #if BYTE_ORDER == LITTLE_ENDIAN 45 u_char ip_hl:4, 46 ip_v:4; 47 #endif 48 #if BYTE_ORDER == BIG_ENDIAN 49 u_char ip_v:4, 50 ip_hl:4; 51 #endif 52 u_char ipf_mff; /* copied from (ip_off&IP_MF) */ 53 short ip_len; 54 u_short ip_id; 55 short ip_off; 56 u_char ip_ttl; 57 u_char ip_p; 58 u_short ip_sum; 59 struct ipasfrag *ipf_next; /* next fragment */ 60 struct ipasfrag *ipf_prev; /* previous fragment */ 61 }; 62 63 /* 64 * Structure stored in mbuf in inpcb.ip_options 65 * and passed to ip_output when ip options are in use. 66 * The actual length of the options (including ipopt_dst) 67 * is in m_len. 68 */ 69 #define MAX_IPOPTLEN 40 70 71 struct ipoption { 72 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 73 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 74 }; 75 76 struct ipstat { 77 long ips_total; /* total packets received */ 78 long ips_badsum; /* checksum bad */ 79 long ips_tooshort; /* packet too short */ 80 long ips_toosmall; /* not enough data */ 81 long ips_badhlen; /* ip header length < data size */ 82 long ips_badlen; /* ip length < ip header length */ 83 long ips_fragments; /* fragments received */ 84 long ips_fragdropped; /* frags dropped (dups, out of space) */ 85 long ips_fragtimeout; /* fragments timed out */ 86 long ips_forward; /* packets forwarded */ 87 long ips_cantforward; /* packets rcvd for unreachable dest */ 88 long ips_redirectsent; /* packets forwarded on same net */ 89 long ips_noproto; /* unknown or unsupported protocol */ 90 long ips_delivered; /* packets consumed here */ 91 long ips_localout; /* total ip packets generated here */ 92 long ips_odropped; /* lost packets due to nobufs, etc. */ 93 long ips_reassembled; /* total packets reassembled ok */ 94 long ips_fragmented; /* output packets fragmented ok */ 95 long ips_ofragments; /* output fragments created */ 96 long ips_cantfrag; /* don't fragment flag was set, etc. */ 97 }; 98 99 #ifdef KERNEL 100 /* flags passed to ip_output as last parameter */ 101 #define IP_FORWARDING 0x1 /* most of ip header exists */ 102 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 103 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 104 105 struct ipstat ipstat; 106 struct ipq ipq; /* ip reass. queue */ 107 u_short ip_id; /* ip packet ctr, for ids */ 108 109 struct mbuf *ip_srcroute(); 110 #endif 111