ip_var.h revision 1.21
1 /* $NetBSD: ip_var.h,v 1.21 1997/10/14 08:38:01 thorpej 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 */ 43 struct ipovly { 44 u_int8_t ih_x1[9]; /* (unused) */ 45 u_int8_t ih_pr; /* protocol */ 46 u_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 */ 62 LIST_HEAD(ipqehead, ipqent); 63 struct ipqent { 64 LIST_ENTRY(ipqent) ipqe_q; 65 union { 66 struct ip *_ip; 67 struct tcpiphdr *_tcp; 68 } _ipqe_u1; 69 struct mbuf *ipqe_m; /* mbuf contains packet */ 70 u_int8_t ipqe_mff; /* for IP fragmentation */ 71 }; 72 #define ipqe_ip _ipqe_u1._ip 73 #define ipqe_tcp _ipqe_u1._tcp 74 75 /* 76 * Ip reassembly queue structure. Each fragment 77 * being reassembled is attached to one of these structures. 78 * They are timed out after ipq_ttl drops to 0, and may also 79 * be reclaimed if memory becomes tight. 80 */ 81 struct ipq { 82 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 83 u_int8_t ipq_ttl; /* time for reass q to live */ 84 u_int8_t ipq_p; /* protocol of this fragment */ 85 u_int16_t ipq_id; /* sequence id for reassembly */ 86 struct ipqehead ipq_fragq; /* to ip fragment queue */ 87 struct in_addr ipq_src, ipq_dst; 88 }; 89 90 /* 91 * Structure stored in mbuf in inpcb.ip_options 92 * and passed to ip_output when ip options are in use. 93 * The actual length of the options (including ipopt_dst) 94 * is in m_len. 95 */ 96 #define MAX_IPOPTLEN 40 97 98 struct ipoption { 99 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 100 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 101 }; 102 103 /* 104 * Structure attached to inpcb.ip_moptions and 105 * passed to ip_output when IP multicast options are in use. 106 */ 107 struct ip_moptions { 108 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 109 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 110 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 111 u_int16_t imo_num_memberships; /* no. memberships this socket */ 112 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 113 }; 114 115 struct ipstat { 116 u_long ips_total; /* total packets received */ 117 u_long ips_badsum; /* checksum bad */ 118 u_long ips_tooshort; /* packet too short */ 119 u_long ips_toosmall; /* not enough data */ 120 u_long ips_badhlen; /* ip header length < data size */ 121 u_long ips_badlen; /* ip length < ip header length */ 122 u_long ips_fragments; /* fragments received */ 123 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 124 u_long ips_fragtimeout; /* fragments timed out */ 125 u_long ips_forward; /* packets forwarded */ 126 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 127 u_long ips_redirectsent; /* packets forwarded on same net */ 128 u_long ips_noproto; /* unknown or unsupported protocol */ 129 u_long ips_delivered; /* datagrams delivered to upper level*/ 130 u_long ips_localout; /* total ip packets generated here */ 131 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 132 u_long ips_reassembled; /* total packets reassembled ok */ 133 u_long ips_fragmented; /* datagrams sucessfully fragmented */ 134 u_long ips_ofragments; /* output fragments created */ 135 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 136 u_long ips_badoptions; /* error in option processing */ 137 u_long ips_noroute; /* packets discarded due to no route */ 138 u_long ips_badvers; /* ip version != 4 */ 139 u_long ips_rawout; /* total raw ip packets generated */ 140 u_long ips_badfrags; /* malformed fragments (bad length) */ 141 u_long ips_rcvmemdrop; /* frags dropped for lack of memory */ 142 u_long ips_toolong; /* ip length > max ip packet size */ 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_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ 150 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 151 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 152 153 struct ipstat ipstat; 154 LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 155 u_int16_t ip_id; /* ip packet ctr, for ids */ 156 int ip_defttl; /* default IP ttl */ 157 158 struct inpcb; 159 160 int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 161 int ip_dooptions __P((struct mbuf *)); 162 void ip_drain __P((void)); 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 int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 172 struct mbuf * 173 ip_reass __P((struct ipqent *, struct ipq *)); 174 struct in_ifaddr * 175 ip_rtaddr __P((struct in_addr)); 176 void ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *, 177 struct mbuf *)); 178 int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 179 void ip_slowtimo __P((void)); 180 struct mbuf * 181 ip_srcroute __P((void)); 182 void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 183 int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 184 void ipintr __P((void)); 185 int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 186 void rip_init __P((void)); 187 void rip_input __P((struct mbuf *, ...)); 188 int rip_output __P((struct mbuf *, ...)); 189 int rip_usrreq __P((struct socket *, 190 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 191 #endif 192
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