ip_var.h revision 1.2
1/* $NetBSD: ip_var.h,v 1.15 1995/11/21 01:07:38 cgd 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#include <sys/queue.h> 39 40/* 41 * Overlay for ip header used by other protocols (tcp, udp). 42 */ 43struct ipovly { 44 u_int8_t ih_x1[9]; /* (unused) */ 45 u_int8_t ih_pr; /* protocol */ 46 int16_t ih_len; /* protocol length */ 47 struct in_addr ih_src; /* source internet address */ 48 struct in_addr ih_dst; /* destination internet address */ 49}; 50 51/* 52 * Ip (reassembly or sequence) queue structures. 53 * 54 * XXX -- The following explains why the ipqe_m field is here, for TCP's use: 55 * We want to avoid doing m_pullup on incoming packets but that 56 * means avoiding dtom on the tcp reassembly code. That in turn means 57 * keeping an mbuf pointer in the reassembly queue (since we might 58 * have a cluster). As a quick hack, the source & destination 59 * port numbers (which are no longer needed once we've located the 60 * tcpcb) are overlayed with an mbuf pointer. 61 */ 62LIST_HEAD(ipqehead, ipqent); 63struct ipqent { 64 LIST_ENTRY(ipqent) ipqe_q; 65 union { 66 struct ip *_ip; 67 struct tcpiphdr *_tcp; 68 } _ipqe_u1; 69 union { 70 u_int8_t _mff; /* for IP fragmentation */ 71 struct mbuf *_m; /* XXX for TCP; see above */ 72 } _ipqe_u2; 73}; 74#define ipqe_ip _ipqe_u1._ip 75#define ipqe_tcp _ipqe_u1._tcp 76#define ipqe_mff _ipqe_u2._mff 77#define ipqe_m _ipqe_u2._m 78 79/* 80 * Ip reassembly queue structure. Each fragment 81 * being reassembled is attached to one of these structures. 82 * They are timed out after ipq_ttl drops to 0, and may also 83 * be reclaimed if memory becomes tight. 84 */ 85struct ipq { 86 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 87 u_int8_t ipq_ttl; /* time for reass q to live */ 88 u_int8_t ipq_p; /* protocol of this fragment */ 89 u_int16_t ipq_id; /* sequence id for reassembly */ 90 struct ipqehead ipq_fragq; /* to ip fragment queue */ 91 struct in_addr ipq_src, ipq_dst; 92}; 93 94/* 95 * Structure stored in mbuf in inpcb.ip_options 96 * and passed to ip_output when ip options are in use. 97 * The actual length of the options (including ipopt_dst) 98 * is in m_len. 99 */ 100#define MAX_IPOPTLEN 40 101 102struct ipoption { 103 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 104 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 105}; 106 107/* 108 * Structure attached to inpcb.ip_moptions and 109 * passed to ip_output when IP multicast options are in use. 110 */ 111struct ip_moptions { 112 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 113 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 114 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 115 u_int16_t imo_num_memberships; /* no. memberships this socket */ 116 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 117}; 118 119struct ipstat { 120 u_long ips_total; /* total packets received */ 121 u_long ips_badsum; /* checksum bad */ 122 u_long ips_tooshort; /* packet too short */ 123 u_long ips_toosmall; /* not enough data */ 124 u_long ips_badhlen; /* ip header length < data size */ 125 u_long ips_badlen; /* ip length < ip header length */ 126 u_long ips_fragments; /* fragments received */ 127 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 128 u_long ips_fragtimeout; /* fragments timed out */ 129 u_long ips_forward; /* packets forwarded */ 130 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 131 u_long ips_redirectsent; /* packets forwarded on same net */ 132 u_long ips_noproto; /* unknown or unsupported protocol */ 133 u_long ips_delivered; /* datagrams delivered to upper level*/ 134 u_long ips_localout; /* total ip packets generated here */ 135 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 136 u_long ips_reassembled; /* total packets reassembled ok */ 137 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 138 u_long ips_ofragments; /* output fragments created */ 139 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 140 u_long ips_badoptions; /* error in option processing */ 141 u_long ips_noroute; /* packets discarded due to no route */ 142 u_long ips_badvers; /* ip version != 4 */ 143 u_long ips_rawout; /* total raw ip packets generated */ 144 u_long ips_badfrags; /* malformed fragments (bad length) */ 145 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ 146}; 147 148#ifdef _KERNEL 149/* flags passed to ip_output as last parameter */ 150#define IP_FORWARDING 0x1 /* most of ip header exists */ 151#define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 152#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 153#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 154 155struct ipstat ipstat; 156LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 157u_int16_t ip_id; /* ip packet ctr, for ids */ 158int ip_defttl; /* default IP ttl */ 159 160int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 161int ip_dooptions __P((struct mbuf *)); 162void ip_drain __P((void)); 163void ip_forward __P((struct mbuf *, int)); 164void ip_freef __P((struct ipq *)); 165void ip_freemoptions __P((struct ip_moptions *)); 166int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 167void ip_init __P((void)); 168int ip_mforward __P((struct mbuf *, struct ifnet *)); 169int ip_optcopy __P((struct ip *, struct ip *)); 170int ip_output __P((struct mbuf *, 171 struct mbuf *, struct route *, int, struct ip_moptions *)); 172int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 173struct ip * 174 ip_reass __P((struct ipqent *, struct ipq *)); 175struct in_ifaddr * 176 ip_rtaddr __P((struct in_addr)); 177int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 178void ip_slowtimo __P((void)); 179struct mbuf * 180 ip_srcroute __P((void)); 181void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 182int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 183void ipintr __P((void)); 184int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 185void rip_init __P((void)); 186void rip_input __P((struct mbuf *)); 187int rip_output __P((struct mbuf *, struct socket *, u_long)); 188int rip_usrreq __P((struct socket *, 189 int, struct mbuf *, struct mbuf *, struct mbuf *)); 190#endif 191