1 /* 2 * Copyright (c) 1982, 1986, 1993 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ip_var.h 7.11 (Berkeley) 04/18/93 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; /* XXX overlays ip_tos: use low bit 53 * to avoid destroying tos; 54 * copied from (ip_off&IP_MF) */ 55 short ip_len; 56 u_short ip_id; 57 short ip_off; 58 u_char ip_ttl; 59 u_char ip_p; 60 u_short ip_sum; 61 struct ipasfrag *ipf_next; /* next fragment */ 62 struct ipasfrag *ipf_prev; /* previous fragment */ 63 }; 64 65 /* 66 * Structure stored in mbuf in inpcb.ip_options 67 * and passed to ip_output when ip options are in use. 68 * The actual length of the options (including ipopt_dst) 69 * is in m_len. 70 */ 71 #define MAX_IPOPTLEN 40 72 73 struct ipoption { 74 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 75 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 76 }; 77 78 /* 79 * Structure attached to inpcb.ip_moptions and 80 * passed to ip_output when IP multicast options are in use. 81 */ 82 struct ip_moptions { 83 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 84 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 85 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 86 u_short imo_num_memberships; /* no. memberships this socket */ 87 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 88 }; 89 90 struct ipstat { 91 u_long ips_total; /* total packets received */ 92 u_long ips_badsum; /* checksum bad */ 93 u_long ips_tooshort; /* packet too short */ 94 u_long ips_toosmall; /* not enough data */ 95 u_long ips_badhlen; /* ip header length < data size */ 96 u_long ips_badlen; /* ip length < ip header length */ 97 u_long ips_fragments; /* fragments received */ 98 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 99 u_long ips_fragtimeout; /* fragments timed out */ 100 u_long ips_forward; /* packets forwarded */ 101 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 102 u_long ips_redirectsent; /* packets forwarded on same net */ 103 u_long ips_noproto; /* unknown or unsupported protocol */ 104 u_long ips_delivered; /* datagrams delivered to upper level*/ 105 u_long ips_localout; /* total ip packets generated here */ 106 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 107 u_long ips_reassembled; /* total packets reassembled ok */ 108 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 109 u_long ips_ofragments; /* output fragments created */ 110 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 111 u_long ips_badoptions; /* error in option processing */ 112 u_long ips_noroute; /* packets discarded due to no route */ 113 u_long ips_badvers; /* ip version != 4 */ 114 u_long ips_rawout; /* total raw ip packets generated */ 115 }; 116 117 #ifdef KERNEL 118 /* flags passed to ip_output as last parameter */ 119 #define IP_FORWARDING 0x1 /* most of ip header exists */ 120 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 121 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 122 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 123 124 struct ipstat ipstat; 125 struct ipq ipq; /* ip reass. queue */ 126 u_short ip_id; /* ip packet ctr, for ids */ 127 int ip_defttl; /* default IP ttl */ 128 129 struct mbuf *ip_srcroute(); 130 #endif 131