ip_var.h revision 1.11
1 /* $NetBSD: ip_var.h,v 1.11 1995/03/26 20:32:33 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 36 */ 37 38 /* 39 * Overlay for ip header used by other protocols (tcp, udp). 40 */ 41 struct ipovly { 42 caddr_t ih_next, ih_prev; /* for protocol sequence q's */ 43 u_char ih_x1; /* (unused) */ 44 u_char ih_pr; /* protocol */ 45 short ih_len; /* protocol length */ 46 struct in_addr ih_src; /* source internet address */ 47 struct in_addr ih_dst; /* destination internet address */ 48 }; 49 50 /* 51 * Ip reassembly queue structure. Each fragment 52 * being reassembled is attached to one of these structures. 53 * They are timed out after ipq_ttl drops to 0, and may also 54 * be reclaimed if memory becomes tight. 55 */ 56 struct ipq { 57 struct ipq *next,*prev; /* to other reass headers */ 58 u_char ipq_ttl; /* time for reass q to live */ 59 u_char ipq_p; /* protocol of this fragment */ 60 u_short ipq_id; /* sequence id for reassembly */ 61 struct ipasfrag *ipq_next,*ipq_prev; 62 /* to ip headers of fragments */ 63 struct in_addr ipq_src,ipq_dst; 64 }; 65 66 /* 67 * Ip header, when holding a fragment. 68 * 69 * Note: ipf_next must be at same offset as ipq_next above 70 */ 71 struct ipasfrag { 72 #if BYTE_ORDER == LITTLE_ENDIAN 73 u_char ip_hl:4, 74 ip_v:4; 75 #endif 76 #if BYTE_ORDER == BIG_ENDIAN 77 u_char ip_v:4, 78 ip_hl:4; 79 #endif 80 u_char ipf_mff; /* XXX overlays ip_tos: use low bit 81 * to avoid destroying tos; 82 * copied from (ip_off&IP_MF) */ 83 short ip_len; 84 u_short ip_id; 85 short ip_off; 86 u_char ip_ttl; 87 u_char ip_p; 88 u_short ip_sum; 89 struct ipasfrag *ipf_next; /* next fragment */ 90 struct ipasfrag *ipf_prev; /* previous fragment */ 91 }; 92 93 /* 94 * Structure stored in mbuf in inpcb.ip_options 95 * and passed to ip_output when ip options are in use. 96 * The actual length of the options (including ipopt_dst) 97 * is in m_len. 98 */ 99 #define MAX_IPOPTLEN 40 100 101 struct ipoption { 102 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 103 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 104 }; 105 106 /* 107 * Structure attached to inpcb.ip_moptions and 108 * passed to ip_output when IP multicast options are in use. 109 */ 110 struct ip_moptions { 111 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 112 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 113 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 114 u_short imo_num_memberships; /* no. memberships this socket */ 115 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 116 }; 117 118 struct ipstat { 119 u_long ips_total; /* total packets received */ 120 u_long ips_badsum; /* checksum bad */ 121 u_long ips_tooshort; /* packet too short */ 122 u_long ips_toosmall; /* not enough data */ 123 u_long ips_badhlen; /* ip header length < data size */ 124 u_long ips_badlen; /* ip length < ip header length */ 125 u_long ips_fragments; /* fragments received */ 126 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 127 u_long ips_fragtimeout; /* fragments timed out */ 128 u_long ips_forward; /* packets forwarded */ 129 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 130 u_long ips_redirectsent; /* packets forwarded on same net */ 131 u_long ips_noproto; /* unknown or unsupported protocol */ 132 u_long ips_delivered; /* datagrams delivered to upper level*/ 133 u_long ips_localout; /* total ip packets generated here */ 134 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 135 u_long ips_reassembled; /* total packets reassembled ok */ 136 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 137 u_long ips_ofragments; /* output fragments created */ 138 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 139 u_long ips_badoptions; /* error in option processing */ 140 u_long ips_noroute; /* packets discarded due to no route */ 141 u_long ips_badvers; /* ip version != 4 */ 142 u_long ips_rawout; /* total raw ip packets generated */ 143 }; 144 145 #ifdef _KERNEL 146 /* flags passed to ip_output as last parameter */ 147 #define IP_FORWARDING 0x1 /* most of ip header exists */ 148 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 149 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 150 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 151 152 struct ipstat ipstat; 153 struct ipq ipq; /* ip reass. queue */ 154 u_short ip_id; /* ip packet ctr, for ids */ 155 int ip_defttl; /* default IP ttl */ 156 157 int in_control __P((struct socket *, int, caddr_t, struct ifnet *)); 158 int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 159 void ip_deq __P((struct ipasfrag *)); 160 int ip_dooptions __P((struct mbuf *)); 161 void ip_drain __P((void)); 162 void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); 163 void ip_forward __P((struct mbuf *, int)); 164 void ip_freef __P((struct ipq *)); 165 void ip_freemoptions __P((struct ip_moptions *)); 166 int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 167 void ip_init __P((void)); 168 int ip_mforward __P((struct mbuf *, struct ifnet *)); 169 int ip_optcopy __P((struct ip *, struct ip *)); 170 int ip_output __P((struct mbuf *, 171 struct mbuf *, struct route *, int, struct ip_moptions *)); 172 int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 173 struct ip * 174 ip_reass __P((struct ipasfrag *, struct ipq *)); 175 struct in_ifaddr * 176 ip_rtaddr __P((struct in_addr)); 177 int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 178 void ip_slowtimo __P((void)); 179 struct mbuf * 180 ip_srcroute __P((void)); 181 void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 182 int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 183 void ipintr __P((void)); 184 int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 185 void rip_init __P((void)); 186 void rip_input __P((struct mbuf *)); 187 int rip_output __P((struct mbuf *, struct socket *, u_long)); 188 int rip_usrreq __P((struct socket *, 189 int, struct mbuf *, struct mbuf *, struct mbuf *)); 190 #endif 191
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