ip_var.h revision 1541
168651Skris/* 268651Skris * Copyright (c) 1982, 1986, 1993 368651Skris * The Regents of the University of California. All rights reserved. 468651Skris * 568651Skris * Redistribution and use in source and binary forms, with or without 668651Skris * modification, are permitted provided that the following conditions 768651Skris * are met: 868651Skris * 1. Redistributions of source code must retain the above copyright 968651Skris * notice, this list of conditions and the following disclaimer. 1068651Skris * 2. Redistributions in binary form must reproduce the above copyright 1168651Skris * notice, this list of conditions and the following disclaimer in the 1268651Skris * documentation and/or other materials provided with the distribution. 1368651Skris * 3. All advertising materials mentioning features or use of this software 1468651Skris * must display the following acknowledgement: 1568651Skris * This product includes software developed by the University of 1668651Skris * California, Berkeley and its contributors. 1768651Skris * 4. Neither the name of the University nor the names of its contributors 1868651Skris * may be used to endorse or promote products derived from this software 1968651Skris * without specific prior written permission. 2068651Skris * 2168651Skris * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2268651Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2368651Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2468651Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2568651Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2668651Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2768651Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2868651Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2968651Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3068651Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3168651Skris * SUCH DAMAGE. 3268651Skris * 3368651Skris * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 3468651Skris */ 3568651Skris 3668651Skris/* 3768651Skris * Overlay for ip header used by other protocols (tcp, udp). 3868651Skris */ 3968651Skrisstruct ipovly { 4068651Skris caddr_t ih_next, ih_prev; /* for protocol sequence q's */ 4168651Skris u_char ih_x1; /* (unused) */ 4268651Skris u_char ih_pr; /* protocol */ 4379998Skris short ih_len; /* protocol length */ 4468651Skris struct in_addr ih_src; /* source internet address */ 4568651Skris struct in_addr ih_dst; /* destination internet address */ 4668651Skris}; 4768651Skris 4868651Skris/* 4968651Skris * Ip reassembly queue structure. Each fragment 5068651Skris * being reassembled is attached to one of these structures. 5168651Skris * They are timed out after ipq_ttl drops to 0, and may also 5268651Skris * be reclaimed if memory becomes tight. 5368651Skris */ 5468651Skrisstruct ipq { 55 struct ipq *next,*prev; /* to other reass headers */ 56 u_char ipq_ttl; /* time for reass q to live */ 57 u_char ipq_p; /* protocol of this fragment */ 58 u_short ipq_id; /* sequence id for reassembly */ 59 struct ipasfrag *ipq_next,*ipq_prev; 60 /* to ip headers of fragments */ 61 struct in_addr ipq_src,ipq_dst; 62}; 63 64/* 65 * Ip header, when holding a fragment. 66 * 67 * Note: ipf_next must be at same offset as ipq_next above 68 */ 69struct ipasfrag { 70#if BYTE_ORDER == LITTLE_ENDIAN 71 u_char ip_hl:4, 72 ip_v:4; 73#endif 74#if BYTE_ORDER == BIG_ENDIAN 75 u_char ip_v:4, 76 ip_hl:4; 77#endif 78 u_char ipf_mff; /* XXX overlays ip_tos: use low bit 79 * to avoid destroying tos; 80 * copied from (ip_off&IP_MF) */ 81 short ip_len; 82 u_short ip_id; 83 short ip_off; 84 u_char ip_ttl; 85 u_char ip_p; 86 u_short ip_sum; 87 struct ipasfrag *ipf_next; /* next fragment */ 88 struct ipasfrag *ipf_prev; /* previous fragment */ 89}; 90 91/* 92 * Structure stored in mbuf in inpcb.ip_options 93 * and passed to ip_output when ip options are in use. 94 * The actual length of the options (including ipopt_dst) 95 * is in m_len. 96 */ 97#define MAX_IPOPTLEN 40 98 99struct ipoption { 100 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 101 char ipopt_list[MAX_IPOPTLEN]; /* options proper */ 102}; 103 104/* 105 * Structure attached to inpcb.ip_moptions and 106 * passed to ip_output when IP multicast options are in use. 107 */ 108struct ip_moptions { 109 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 110 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */ 111 u_char imo_multicast_loop; /* 1 => hear sends if a member */ 112 u_short imo_num_memberships; /* no. memberships this socket */ 113 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 114}; 115 116struct ipstat { 117 u_long ips_total; /* total packets received */ 118 u_long ips_badsum; /* checksum bad */ 119 u_long ips_tooshort; /* packet too short */ 120 u_long ips_toosmall; /* not enough data */ 121 u_long ips_badhlen; /* ip header length < data size */ 122 u_long ips_badlen; /* ip length < ip header length */ 123 u_long ips_fragments; /* fragments received */ 124 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 125 u_long ips_fragtimeout; /* fragments timed out */ 126 u_long ips_forward; /* packets forwarded */ 127 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 128 u_long ips_redirectsent; /* packets forwarded on same net */ 129 u_long ips_noproto; /* unknown or unsupported protocol */ 130 u_long ips_delivered; /* datagrams delivered to upper level*/ 131 u_long ips_localout; /* total ip packets generated here */ 132 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 133 u_long ips_reassembled; /* total packets reassembled ok */ 134 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 135 u_long ips_ofragments; /* output fragments created */ 136 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 137 u_long ips_badoptions; /* error in option processing */ 138 u_long ips_noroute; /* packets discarded due to no route */ 139 u_long ips_badvers; /* ip version != 4 */ 140 u_long ips_rawout; /* total raw ip packets generated */ 141}; 142 143#ifdef KERNEL 144/* flags passed to ip_output as last parameter */ 145#define IP_FORWARDING 0x1 /* most of ip header exists */ 146#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 147#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 148#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 149 150struct ipstat ipstat; 151struct ipq ipq; /* ip reass. queue */ 152u_short ip_id; /* ip packet ctr, for ids */ 153int ip_defttl; /* default IP ttl */ 154 155int in_control __P((struct socket *, int, caddr_t, struct ifnet *)); 156int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 157void ip_deq __P((struct ipasfrag *)); 158int ip_dooptions __P((struct mbuf *)); 159void ip_drain __P((void)); 160void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); 161void ip_forward __P((struct mbuf *, int)); 162void ip_freef __P((struct ipq *)); 163void ip_freemoptions __P((struct ip_moptions *)); 164int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 165void ip_init __P((void)); 166int ip_mforward __P((struct mbuf *, struct ifnet *)); 167int ip_optcopy __P((struct ip *, struct ip *)); 168int ip_output __P((struct mbuf *, 169 struct mbuf *, struct route *, int, struct ip_moptions *)); 170int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 171struct ip * 172 ip_reass __P((struct ipasfrag *, struct ipq *)); 173struct in_ifaddr * 174 ip_rtaddr __P((struct in_addr)); 175int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 176void ip_slowtimo __P((void)); 177struct mbuf * 178 ip_srcroute __P((void)); 179void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 180int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 181void ipintr __P((void)); 182int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 183void rip_init __P((void)); 184void rip_input __P((struct mbuf *)); 185int rip_output __P((struct mbuf *, struct socket *, u_long)); 186int rip_usrreq __P((struct socket *, 187 int, struct mbuf *, struct mbuf *, struct mbuf *)); 188#endif 189