ip_var.h revision 1.122
1 /* $NetBSD: ip_var.h,v 1.122 2018/01/10 10:56:30 knakahara 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 Flow structure 53 */ 54 struct ipflow { 55 TAILQ_ENTRY(ipflow) ipf_list; /* next in active list */ 56 TAILQ_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ 57 size_t ipf_hashidx; /* own hash index of ipflowtable[] */ 58 struct in_addr ipf_dst; /* destination address */ 59 struct in_addr ipf_src; /* source address */ 60 uint8_t ipf_tos; /* type-of-service */ 61 struct route ipf_ro; /* associated route entry */ 62 u_long ipf_uses; /* number of uses in this period */ 63 u_long ipf_last_uses; /* number of uses in last period */ 64 u_long ipf_dropped; /* ENOBUFS retured by if_output */ 65 u_long ipf_errors; /* other errors returned by if_output */ 66 u_int ipf_timer; /* lifetime timer */ 67 }; 68 69 /* 70 * IP sequence queue structure. 71 * 72 * XXX -- The following explains why the ipqe_m field is here, for TCP's use: 73 * We want to avoid doing m_pullup on incoming packets but that 74 * means avoiding dtom on the tcp reassembly code. That in turn means 75 * keeping an mbuf pointer in the reassembly queue (since we might 76 * have a cluster). As a quick hack, the source & destination 77 * port numbers (which are no longer needed once we've located the 78 * tcpcb) are overlayed with an mbuf pointer. 79 */ 80 TAILQ_HEAD(ipqehead, ipqent); 81 struct ipqent { 82 TAILQ_ENTRY(ipqent) ipqe_q; 83 union { 84 struct ip *_ip; 85 struct tcpiphdr *_tcp; 86 } _ipqe_u1; 87 struct mbuf *ipqe_m; /* point to first mbuf */ 88 struct mbuf *ipre_mlast; /* point to last mbuf */ 89 u_int8_t ipqe_mff; /* for IP fragmentation */ 90 /* 91 * The following are used in TCP reassembly 92 */ 93 TAILQ_ENTRY(ipqent) ipqe_timeq; 94 u_int32_t ipqe_seq; 95 u_int32_t ipqe_len; 96 u_int32_t ipqe_flags; 97 }; 98 #define ipqe_tcp _ipqe_u1._tcp 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 if_index_t imo_multicast_if_index; /* I/F 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 struct ip_pktopts { 127 struct sockaddr_in ippo_laddr; /* source address */ 128 struct ip_moptions *ippo_imo; /* inp->inp_moptions or &ippo_imobuf */ 129 struct ip_moptions ippo_imobuf; /* use when IP_PKTINFO */ 130 }; 131 132 /* 133 * IP statistics. 134 * Each counter is an unsigned 64-bit value. 135 */ 136 #define IP_STAT_TOTAL 0 /* total packets received */ 137 #define IP_STAT_BADSUM 1 /* checksum bad */ 138 #define IP_STAT_TOOSHORT 2 /* packet too short */ 139 #define IP_STAT_TOOSMALL 3 /* not enough data */ 140 #define IP_STAT_BADHLEN 4 /* ip header length < data size */ 141 #define IP_STAT_BADLEN 5 /* ip length < ip header length */ 142 #define IP_STAT_FRAGMENTS 6 /* fragments received */ 143 #define IP_STAT_FRAGDROPPED 7 /* frags dropped (dups, out of space) */ 144 #define IP_STAT_FRAGTIMEOUT 8 /* fragments timed out */ 145 #define IP_STAT_FORWARD 9 /* packets forwarded */ 146 #define IP_STAT_FASTFORWARD 10 /* packets fast forwarded */ 147 #define IP_STAT_CANTFORWARD 11 /* packets rcvd for unreachable dest */ 148 #define IP_STAT_REDIRECTSENT 12 /* packets forwareded on same net */ 149 #define IP_STAT_NOPROTO 13 /* unknown or unsupported protocol */ 150 #define IP_STAT_DELIVERED 14 /* datagrams delivered to upper level */ 151 #define IP_STAT_LOCALOUT 15 /* total ip packets generated here */ 152 #define IP_STAT_ODROPPED 16 /* lost packets due to nobufs, etc. */ 153 #define IP_STAT_REASSEMBLED 17 /* total packets reassembled ok */ 154 #define IP_STAT_FRAGMENTED 18 /* datagrams successfully fragmented */ 155 #define IP_STAT_OFRAGMENTS 19 /* output fragments created */ 156 #define IP_STAT_CANTFRAG 20 /* don't fragment flag was set, etc. */ 157 #define IP_STAT_BADOPTIONS 21 /* error in option processing */ 158 #define IP_STAT_NOROUTE 22 /* packets discarded due to no route */ 159 #define IP_STAT_BADVERS 23 /* ip version != 4 */ 160 #define IP_STAT_RAWOUT 24 /* total raw ip packets generated */ 161 #define IP_STAT_BADFRAGS 25 /* malformed fragments (bad length) */ 162 #define IP_STAT_RCVMEMDROP 26 /* frags dropped for lack of memory */ 163 #define IP_STAT_TOOLONG 27 /* ip length > max ip packet size */ 164 #define IP_STAT_NOGIF 28 /* no match gif found */ 165 #define IP_STAT_BADADDR 29 /* invalid address on header */ 166 #define IP_STAT_NOL2TP 30 /* no match l2tp found */ 167 #define IP_STAT_NOIPSEC 31 /* no match ipsec(4) found */ 168 169 #define IP_NSTATS 32 170 171 #ifdef _KERNEL 172 173 #ifdef _KERNEL_OPT 174 #include "opt_gateway.h" 175 #include "opt_mbuftrace.h" 176 #endif 177 178 /* 179 * The following flags can be passed to ip_output() as last parameter 180 */ 181 #define IP_FORWARDING 0x0001 /* most of ip header exists */ 182 #define IP_RAWOUTPUT 0x0002 /* raw ip header exists */ 183 #define IP_RETURNMTU 0x0004 /* pass back mtu on EMSGSIZE */ 184 #define IP_NOIPNEWID 0x0008 /* don't fill in ip_id */ 185 __CTASSERT(SO_DONTROUTE == 0x0010); 186 __CTASSERT(SO_BROADCAST == 0x0020); 187 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 188 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 189 190 #define IP_IGMP_MCAST 0x0040 /* IGMP for mcast join/leave */ 191 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 192 #define IP_ROUTETOIFINDEX 0x0800 /* force route imo_multicast_if_index */ 193 194 extern struct domain inetdomain; 195 extern const struct pr_usrreqs rip_usrreqs; 196 197 extern int ip_defttl; /* default IP ttl */ 198 extern int ipforwarding; /* ip forwarding */ 199 extern int ip_mtudisc; /* mtu discovery */ 200 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 201 extern int anonportmin; /* minimum ephemeral port */ 202 extern int anonportmax; /* maximum ephemeral port */ 203 extern int lowportmin; /* minimum reserved port */ 204 extern int lowportmax; /* maximum reserved port */ 205 extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ 206 extern struct rttimer_queue *ip_mtudisc_timeout_q; 207 #ifdef MBUFTRACE 208 extern struct mowner ip_rx_mowner; 209 extern struct mowner ip_tx_mowner; 210 #endif 211 struct inpcb; 212 struct sockopt; 213 214 void ip_init(void); 215 void in_init(void); 216 217 int ip_ctloutput(int, struct socket *, struct sockopt *); 218 int ip_setpktopts(struct mbuf *, struct ip_pktopts *, int *, 219 struct inpcb *, kauth_cred_t); 220 void ip_drain(void); 221 void ip_drainstub(void); 222 void ip_freemoptions(struct ip_moptions *); 223 int ip_optcopy(struct ip *, struct ip *); 224 u_int ip_optlen(struct inpcb *); 225 int ip_output(struct mbuf *, struct mbuf *, struct route *, int, 226 struct ip_moptions *, struct inpcb *); 227 int ip_fragment(struct mbuf *, struct ifnet *, u_long); 228 229 void ip_reass_init(void); 230 int ip_reass_packet(struct mbuf **, struct ip *); 231 void ip_reass_slowtimo(void); 232 void ip_reass_drain(void); 233 234 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 235 struct mbuf *); 236 void ip_slowtimo(void); 237 void ip_fasttimo(void); 238 struct mbuf * 239 ip_srcroute(struct mbuf *); 240 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 241 void ip_statinc(u_int); 242 void * rip_ctlinput(int, const struct sockaddr *, void *); 243 int rip_ctloutput(int, struct socket *, struct sockopt *); 244 void rip_init(void); 245 void rip_input(struct mbuf *, ...); 246 int rip_output(struct mbuf *, struct inpcb *, struct mbuf *, struct lwp *); 247 int rip_usrreq(struct socket *, 248 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); 249 250 int ip_setmoptions(struct ip_moptions **, const struct sockopt *sopt); 251 int ip_getmoptions(struct ip_moptions *, struct sockopt *sopt); 252 253 int ip_if_output(struct ifnet * const, struct mbuf * const, 254 const struct sockaddr * const, const struct rtentry *); 255 256 /* IP Flow interface. */ 257 void ipflow_init(void); 258 void ipflow_poolinit(void); 259 void ipflow_create(struct route *, struct mbuf *); 260 void ipflow_slowtimo(void); 261 int ipflow_invalidate_all(int); 262 263 #endif /* _KERNEL */ 264 265 #endif /* !_NETINET_IP_VAR_H_ */ 266
Indexes created Sun Sep 28 16:09:52 GMT 2025