1 /* $OpenBSD: ip_var.h,v 1.30 2004/04/28 02:51:58 cedric Exp $ */ 2 /* $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93 33 */ 34 35 #ifndef _NETINET_IP_VAR_H_ 36 #define _NETINET_IP_VAR_H_ 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 tcphdr *_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 successfully 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 u_long ips_nogif; /* no match gif found */ 144 u_long ips_badaddr; /* invalid address on header */ 145 u_long ips_inhwcsum; /* hardware checksummed on input */ 146 u_long ips_outhwcsum; /* hardware checksummed on output */ 147 }; 148 149 #ifdef _KERNEL 150 /* flags passed to ip_output as last parameter */ 151 #define IP_FORWARDING 0x1 /* most of ip header exists */ 152 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 153 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 154 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 155 #define IP_MTUDISC 0x0400 /* pmtu discovery, set DF */ 156 #define IP_ROUTETOETHER 0x0800 /* ether addresses given */ 157 158 extern struct ipstat ipstat; 159 extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 160 extern int ip_defttl; /* default IP ttl */ 161 162 extern int ip_mtudisc; /* mtu discovery */ 163 extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 164 extern struct rttimer_queue *ip_mtudisc_timeout_q; 165 extern struct pool ipqent_pool; 166 167 int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 168 int ip_dooptions(struct mbuf *); 169 void ip_drain(void); 170 void ip_flush(void); 171 void ip_forward(struct mbuf *, int); 172 int ip_fragment(struct mbuf *, struct ifnet *, u_long); 173 void ip_freef(struct ipq *); 174 void ip_freemoptions(struct ip_moptions *); 175 int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 176 void ip_init(void); 177 int ip_mforward(struct mbuf *, struct ifnet *); 178 int ip_optcopy(struct ip *, struct ip *); 179 int ip_output(struct mbuf *, ...); 180 int ip_pcbopts(struct mbuf **, struct mbuf *); 181 struct mbuf * 182 ip_reass(struct ipqent *, struct ipq *); 183 struct in_ifaddr * 184 in_iawithaddr(struct in_addr, struct mbuf *); 185 struct in_ifaddr * 186 ip_rtaddr(struct in_addr); 187 u_int16_t 188 ip_randomid(void); 189 int ip_setmoptions(int, struct ip_moptions **, struct mbuf *); 190 void ip_slowtimo(void); 191 struct mbuf * 192 ip_srcroute(void); 193 void ip_stripoptions(struct mbuf *, struct mbuf *); 194 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 195 void ipintr(void); 196 void ipv4_input(struct mbuf *); 197 int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 198 void rip_init(void); 199 void rip_input(struct mbuf *, ...); 200 int rip_output(struct mbuf *, ...); 201 int rip_usrreq(struct socket *, 202 int, struct mbuf *, struct mbuf *, struct mbuf *); 203 #endif /* _KERNEL */ 204 #endif /* _NETINET_IP_VAR_H_ */ 205