ip_var.h revision 1.85
1 /* $NetBSD: ip_var.h,v 1.85 2008/04/07 06:31:28 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ip_var.h 8.2 (Berkeley) 1/9/95 32 */ 33 34 #ifndef _NETINET_IP_VAR_H_ 35 #define _NETINET_IP_VAR_H_ 36 37 #include <sys/queue.h> 38 #include <net/route.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 } __packed; 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 TAILQ_HEAD(ipqehead, ipqent); 63 struct ipqent { 64 TAILQ_ENTRY(ipqent) ipqe_q; 65 union { 66 struct ip *_ip; 67 struct tcpiphdr *_tcp; 68 } _ipqe_u1; 69 struct mbuf *ipqe_m; /* point to first mbuf */ 70 struct mbuf *ipre_mlast; /* point to last mbuf */ 71 u_int8_t ipqe_mff; /* for IP fragmentation */ 72 /* 73 * The following are used in TCP reassembly 74 */ 75 TAILQ_ENTRY(ipqent) ipqe_timeq; 76 u_int32_t ipqe_seq; 77 u_int32_t ipqe_len; 78 u_int32_t ipqe_flags; 79 }; 80 #define ipqe_ip _ipqe_u1._ip 81 #define ipqe_tcp _ipqe_u1._tcp 82 83 /* 84 * Ip reassembly queue structure. Each fragment 85 * being reassembled is attached to one of these structures. 86 * They are timed out after ipq_ttl drops to 0, and may also 87 * be reclaimed if memory becomes tight. 88 */ 89 struct ipq { 90 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 91 u_int8_t ipq_ttl; /* time for reass q to live */ 92 u_int8_t ipq_p; /* protocol of this fragment */ 93 u_int16_t ipq_id; /* sequence id for reassembly */ 94 struct ipqehead ipq_fragq; /* to ip fragment queue */ 95 struct in_addr ipq_src, ipq_dst; 96 u_int16_t ipq_nfrags; /* frags in this queue entry */ 97 u_int8_t ipq_tos; /* TOS of this fragment */ 98 }; 99 100 /* 101 * Structure stored in mbuf in inpcb.ip_options 102 * and passed to ip_output when ip options are in use. 103 * The actual length of the options (including ipopt_dst) 104 * is in m_len. 105 */ 106 #define MAX_IPOPTLEN 40 107 108 struct ipoption { 109 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 110 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 111 }; 112 113 /* 114 * Structure attached to inpcb.ip_moptions and 115 * passed to ip_output when IP multicast options are in use. 116 */ 117 struct ip_moptions { 118 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 119 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 120 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 121 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 122 u_int16_t imo_num_memberships; /* no. memberships this socket */ 123 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 124 }; 125 126 /* 127 * IP statistics. 128 * Each counter is an unsigned 64-bit value. 129 */ 130 #define IP_STAT_TOTAL 0 /* total packets received */ 131 #define IP_STAT_BADSUM 1 /* checksum bad */ 132 #define IP_STAT_TOOSHORT 2 /* packet too short */ 133 #define IP_STAT_TOOSMALL 3 /* not enough data */ 134 #define IP_STAT_BADHLEN 4 /* ip header length < data size */ 135 #define IP_STAT_BADLEN 5 /* ip length < ip header length */ 136 #define IP_STAT_FRAGMENTS 6 /* fragments received */ 137 #define IP_STAT_FRAGDROPPED 7 /* frags dropped (dups, out of space) */ 138 #define IP_STAT_FRAGTIMEOUT 8 /* fragments timed out */ 139 #define IP_STAT_FORWARD 9 /* packets forwarded */ 140 #define IP_STAT_FASTFORWARD 10 /* packets fast forwarded */ 141 #define IP_STAT_CANTFORWARD 11 /* packets rcvd for unreachable dest */ 142 #define IP_STAT_REDIRECTSENT 12 /* packets forwareded on same net */ 143 #define IP_STAT_NOPROTO 13 /* unknown or unsupported protocol */ 144 #define IP_STAT_DELIVERED 14 /* datagrams delivered to upper level */ 145 #define IP_STAT_LOCALOUT 15 /* total ip packets generated here */ 146 #define IP_STAT_ODROPPED 16 /* lost packets due to nobufs, etc. */ 147 #define IP_STAT_REASSEMBLED 17 /* total packets reassembled ok */ 148 #define IP_STAT_FRAGMENTED 18 /* datagrams successfully fragmented */ 149 #define IP_STAT_OFRAGMENTS 19 /* output fragments created */ 150 #define IP_STAT_CANTFRAG 20 /* don't fragment flag was set, etc. */ 151 #define IP_STAT_BADOPTIONS 21 /* error in option processing */ 152 #define IP_STAT_NOROUTE 22 /* packets discarded due to no route */ 153 #define IP_STAT_BADVERS 23 /* ip version != 4 */ 154 #define IP_STAT_RAWOUT 24 /* total raw ip packets generated */ 155 #define IP_STAT_BADFRAGS 25 /* malformed fragments (bad length) */ 156 #define IP_STAT_RCVMEMDROP 26 /* frags dropped for lack of memory */ 157 #define IP_STAT_TOOLONG 27 /* ip length > max ip packet size */ 158 #define IP_STAT_NOGIF 28 /* no match gif found */ 159 #define IP_STAT_BADADDR 29 /* invalid address on header */ 160 161 #define IP_NSTATS 30 162 163 #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */ 164 struct ipflow { 165 LIST_ENTRY(ipflow) ipf_list; /* next in active list */ 166 LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ 167 struct in_addr ipf_dst; /* destination address */ 168 struct in_addr ipf_src; /* source address */ 169 u_int8_t ipf_tos; /* type-of-service */ 170 struct route ipf_ro; /* associated route entry */ 171 u_long ipf_uses; /* number of uses in this period */ 172 u_long ipf_last_uses; /* number of uses in last period */ 173 u_long ipf_dropped; /* ENOBUFS returned by if_output */ 174 u_long ipf_errors; /* other errors returned by if_output */ 175 u_int ipf_timer; /* lifetime timer */ 176 time_t ipf_start; /* creation time */ 177 }; 178 179 #ifdef _KERNEL 180 181 #ifdef _KERNEL_OPT 182 #include "opt_gateway.h" 183 #include "opt_mbuftrace.h" 184 #endif 185 186 /* flags passed to ip_output as last parameter */ 187 #define IP_FORWARDING 0x1 /* most of ip header exists */ 188 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 189 #define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ 190 #define IP_NOIPNEWID 0x8 /* don't fill in ip_id */ 191 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 192 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 193 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 194 195 #ifdef __NO_STRICT_ALIGNMENT 196 #define IP_HDR_ALIGNED_P(ip) 1 197 #else 198 #define IP_HDR_ALIGNED_P(ip) ((((vaddr_t) (ip)) & 3) == 0) 199 #endif 200 201 extern struct domain inetdomain; 202 203 extern uint64_t ipstat[IP_NSTATS]; /* ip statistics */ 204 extern LIST_HEAD(ipqhead, ipq) ipq[]; /* ip reass. queue */ 205 extern int ip_defttl; /* default IP ttl */ 206 extern int ipforwarding; /* ip forwarding */ 207 extern int ip_mtudisc; /* mtu discovery */ 208 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 209 extern int anonportmin; /* minimum ephemeral port */ 210 extern int anonportmax; /* maximum ephemeral port */ 211 extern int lowportmin; /* minimum reserved port */ 212 extern int lowportmax; /* maximum reserved port */ 213 extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ 214 extern struct rttimer_queue *ip_mtudisc_timeout_q; 215 #ifdef MBUFTRACE 216 extern struct mowner ip_rx_mowner; 217 extern struct mowner ip_tx_mowner; 218 #endif 219 #ifdef GATEWAY 220 extern int ip_maxflows; 221 extern int ip_hashsize; 222 #endif 223 extern struct pool inmulti_pool; 224 extern struct pool ipqent_pool; 225 struct inpcb; 226 227 int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 228 int ip_dooptions(struct mbuf *); 229 void ip_drain(void); 230 void ip_forward(struct mbuf *, int); 231 void ip_freef(struct ipq *); 232 void ip_freemoptions(struct ip_moptions *); 233 int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 234 void ip_init(void); 235 int ip_optcopy(struct ip *, struct ip *); 236 u_int ip_optlen(struct inpcb *); 237 int ip_output(struct mbuf *, ...); 238 int ip_fragment(struct mbuf *, struct ifnet *, u_long); 239 int ip_pcbopts(struct mbuf **, struct mbuf *); 240 struct mbuf * 241 ip_reass(struct ipqent *, struct ipq *, struct ipqhead *); 242 struct in_ifaddr * 243 ip_rtaddr(struct in_addr); 244 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 245 struct mbuf *); 246 int ip_setmoptions(int, struct ip_moptions **, struct mbuf *); 247 void ip_slowtimo(void); 248 struct mbuf * 249 ip_srcroute(void); 250 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 251 void ipintr(void); 252 void * rip_ctlinput(int, const struct sockaddr *, void *); 253 int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 254 void rip_init(void); 255 void rip_input(struct mbuf *, ...); 256 int rip_output(struct mbuf *, ...); 257 int rip_usrreq(struct socket *, 258 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); 259 int ipflow_init(int); 260 struct ipflow *ipflow_reap(int); 261 void ipflow_create(const struct route *, struct mbuf *); 262 void ipflow_slowtimo(void); 263 int ipflow_invalidate_all(int); 264 265 #endif /* _KERNEL */ 266 267 #endif /* !_NETINET_IP_VAR_H_ */ 268
Indexes created Mon Sep 29 03:10:08 GMT 2025