ip_var.h revision 1.45
1 /* $NetBSD: ip_var.h,v 1.45 2001/03/02 04:26:10 itojun 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 8.2 (Berkeley) 1/9/95 36 */ 37 38 #ifndef _NETINET_IP_VAR_H_ 39 #define _NETINET_IP_VAR_H_ 40 41 #include <sys/queue.h> 42 #include <net/route.h> 43 44 /* 45 * Overlay for ip header used by other protocols (tcp, udp). 46 */ 47 struct ipovly { 48 u_int8_t ih_x1[9]; /* (unused) */ 49 u_int8_t ih_pr; /* protocol */ 50 u_int16_t ih_len; /* protocol length */ 51 struct in_addr ih_src; /* source internet address */ 52 struct in_addr ih_dst; /* destination internet address */ 53 } __attribute__((__packed__)); 54 55 /* 56 * Ip (reassembly or sequence) queue structures. 57 * 58 * XXX -- The following explains why the ipqe_m field is here, for TCP's use: 59 * We want to avoid doing m_pullup on incoming packets but that 60 * means avoiding dtom on the tcp reassembly code. That in turn means 61 * keeping an mbuf pointer in the reassembly queue (since we might 62 * have a cluster). As a quick hack, the source & destination 63 * port numbers (which are no longer needed once we've located the 64 * tcpcb) are overlayed with an mbuf pointer. 65 */ 66 LIST_HEAD(ipqehead, ipqent); 67 struct ipqent { 68 LIST_ENTRY(ipqent) ipqe_q; 69 union { 70 struct ip *_ip; 71 struct tcpiphdr *_tcp; 72 } _ipqe_u1; 73 struct mbuf *ipqe_m; /* mbuf contains packet */ 74 u_int8_t ipqe_mff; /* for IP fragmentation */ 75 /* 76 * The following are used in TCP reassembly 77 */ 78 LIST_ENTRY(ipqent) ipqe_timeq; 79 u_int32_t ipqe_seq; 80 u_int32_t ipqe_len; 81 u_int32_t ipqe_flags; 82 }; 83 #define ipqe_ip _ipqe_u1._ip 84 #define ipqe_tcp _ipqe_u1._tcp 85 86 /* 87 * Ip reassembly queue structure. Each fragment 88 * being reassembled is attached to one of these structures. 89 * They are timed out after ipq_ttl drops to 0, and may also 90 * be reclaimed if memory becomes tight. 91 */ 92 struct ipq { 93 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 94 u_int8_t ipq_ttl; /* time for reass q to live */ 95 u_int8_t ipq_p; /* protocol of this fragment */ 96 u_int16_t ipq_id; /* sequence id for reassembly */ 97 struct ipqehead ipq_fragq; /* to ip fragment queue */ 98 struct in_addr ipq_src, ipq_dst; 99 }; 100 101 /* 102 * Structure stored in mbuf in inpcb.ip_options 103 * and passed to ip_output when ip options are in use. 104 * The actual length of the options (including ipopt_dst) 105 * is in m_len. 106 */ 107 #define MAX_IPOPTLEN 40 108 109 struct ipoption { 110 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 111 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 112 }; 113 114 /* 115 * Structure attached to inpcb.ip_moptions and 116 * passed to ip_output when IP multicast options are in use. 117 */ 118 struct ip_moptions { 119 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 120 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 121 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 122 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 123 u_int16_t imo_num_memberships; /* no. memberships this socket */ 124 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 125 }; 126 127 struct ipstat { 128 u_quad_t ips_total; /* total packets received */ 129 u_quad_t ips_badsum; /* checksum bad */ 130 u_quad_t ips_tooshort; /* packet too short */ 131 u_quad_t ips_toosmall; /* not enough data */ 132 u_quad_t ips_badhlen; /* ip header length < data size */ 133 u_quad_t ips_badlen; /* ip length < ip header length */ 134 u_quad_t ips_fragments; /* fragments received */ 135 u_quad_t ips_fragdropped; /* frags dropped (dups, out of space) */ 136 u_quad_t ips_fragtimeout; /* fragments timed out */ 137 u_quad_t ips_forward; /* packets forwarded */ 138 u_quad_t ips_fastforward; /* packets fast forwarded */ 139 u_quad_t ips_cantforward; /* packets rcvd for unreachable dest */ 140 u_quad_t ips_redirectsent; /* packets forwarded on same net */ 141 u_quad_t ips_noproto; /* unknown or unsupported protocol */ 142 u_quad_t ips_delivered; /* datagrams delivered to upper level*/ 143 u_quad_t ips_localout; /* total ip packets generated here */ 144 u_quad_t ips_odropped; /* lost packets due to nobufs, etc. */ 145 u_quad_t ips_reassembled; /* total packets reassembled ok */ 146 u_quad_t ips_fragmented; /* datagrams sucessfully fragmented */ 147 u_quad_t ips_ofragments; /* output fragments created */ 148 u_quad_t ips_cantfrag; /* don't fragment flag was set, etc. */ 149 u_quad_t ips_badoptions; /* error in option processing */ 150 u_quad_t ips_noroute; /* packets discarded due to no route */ 151 u_quad_t ips_badvers; /* ip version != 4 */ 152 u_quad_t ips_rawout; /* total raw ip packets generated */ 153 u_quad_t ips_badfrags; /* malformed fragments (bad length) */ 154 u_quad_t ips_rcvmemdrop; /* frags dropped for lack of memory */ 155 u_quad_t ips_toolong; /* ip length > max ip packet size */ 156 u_quad_t ips_nogif; /* no match gif found */ 157 u_quad_t ips_badaddr; /* invalid address on header */ 158 }; 159 160 #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */ 161 struct ipflow { 162 LIST_ENTRY(ipflow) ipf_list; /* next in active list */ 163 LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ 164 struct in_addr ipf_dst; /* destination address */ 165 struct in_addr ipf_src; /* source address */ 166 u_int8_t ipf_tos; /* type-of-service */ 167 struct route ipf_ro; /* associated route entry */ 168 u_long ipf_uses; /* number of uses in this period */ 169 u_long ipf_last_uses; /* number of uses in last period */ 170 u_long ipf_dropped; /* ENOBUFS returned by if_output */ 171 u_long ipf_errors; /* other errors returned by if_output */ 172 u_int ipf_timer; /* lifetime timer */ 173 time_t ipf_start; /* creation time */ 174 }; 175 176 #ifdef _KERNEL 177 /* flags passed to ip_output as last parameter */ 178 #define IP_FORWARDING 0x1 /* most of ip header exists */ 179 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 180 #define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ 181 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 182 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 183 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 184 185 extern struct ipstat ipstat; /* ip statistics */ 186 extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 187 extern u_int16_t ip_id; /* ip packet ctr, for ids */ 188 extern int ip_defttl; /* default IP ttl */ 189 extern int ipforwarding; /* ip forwarding */ 190 extern int ip_mtudisc; /* mtu discovery */ 191 extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 192 extern int anonportmin; /* minimum ephemeral port */ 193 extern int anonportmax; /* maximum ephemeral port */ 194 extern int lowportmin; /* minimum reserved port */ 195 extern int lowportmax; /* maximum reserved port */ 196 extern struct rttimer_queue *ip_mtudisc_timeout_q; 197 #ifdef GATEWAY 198 extern int ip_maxflows; 199 #endif 200 extern struct pool ipqent_pool; 201 struct inpcb; 202 203 int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 204 int ip_dooptions __P((struct mbuf *)); 205 void ip_drain __P((void)); 206 void ip_forward __P((struct mbuf *, int)); 207 void ip_freef __P((struct ipq *)); 208 void ip_freemoptions __P((struct ip_moptions *)); 209 int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 210 void ip_init __P((void)); 211 int ip_optcopy __P((struct ip *, struct ip *)); 212 u_int ip_optlen __P((struct inpcb *)); 213 int ip_output __P((struct mbuf *, ...)); 214 int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 215 struct mbuf * 216 ip_reass __P((struct ipqent *, struct ipq *)); 217 struct in_ifaddr * 218 ip_rtaddr __P((struct in_addr)); 219 void ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *, 220 struct mbuf *)); 221 int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 222 void ip_slowtimo __P((void)); 223 struct mbuf * 224 ip_srcroute __P((void)); 225 void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 226 int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 227 void ipintr __P((void)); 228 int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 229 void rip_init __P((void)); 230 void rip_input __P((struct mbuf *, ...)); 231 int rip_output __P((struct mbuf *, ...)); 232 int rip_usrreq __P((struct socket *, 233 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 234 void ipflow_init __P((void)); 235 struct ipflow *ipflow_reap __P((int)); 236 void ipflow_create __P((const struct route *, struct mbuf *)); 237 void ipflow_slowtimo __P((void)); 238 #endif 239 240 #endif /* _NETINET_IP_VAR_H_ */ 241
Indexes created Fri Sep 26 08:10:20 GMT 2025