1 /* $NetBSD: ip_var.h,v 1.97 2011/05/03 17:44:31 dyoung 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 sequence queue structure. 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_tcp _ipqe_u1._tcp 81 82 /* 83 * Structure stored in mbuf in inpcb.ip_options 84 * and passed to ip_output when ip options are in use. 85 * The actual length of the options (including ipopt_dst) 86 * is in m_len. 87 */ 88 #define MAX_IPOPTLEN 40 89 90 struct ipoption { 91 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 92 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 93 }; 94 95 /* 96 * Structure attached to inpcb.ip_moptions and 97 * passed to ip_output when IP multicast options are in use. 98 */ 99 struct ip_moptions { 100 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 101 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 102 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 103 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 104 u_int16_t imo_num_memberships; /* no. memberships this socket */ 105 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 106 }; 107 108 /* 109 * IP statistics. 110 * Each counter is an unsigned 64-bit value. 111 */ 112 #define IP_STAT_TOTAL 0 /* total packets received */ 113 #define IP_STAT_BADSUM 1 /* checksum bad */ 114 #define IP_STAT_TOOSHORT 2 /* packet too short */ 115 #define IP_STAT_TOOSMALL 3 /* not enough data */ 116 #define IP_STAT_BADHLEN 4 /* ip header length < data size */ 117 #define IP_STAT_BADLEN 5 /* ip length < ip header length */ 118 #define IP_STAT_FRAGMENTS 6 /* fragments received */ 119 #define IP_STAT_FRAGDROPPED 7 /* frags dropped (dups, out of space) */ 120 #define IP_STAT_FRAGTIMEOUT 8 /* fragments timed out */ 121 #define IP_STAT_FORWARD 9 /* packets forwarded */ 122 #define IP_STAT_FASTFORWARD 10 /* packets fast forwarded */ 123 #define IP_STAT_CANTFORWARD 11 /* packets rcvd for unreachable dest */ 124 #define IP_STAT_REDIRECTSENT 12 /* packets forwareded on same net */ 125 #define IP_STAT_NOPROTO 13 /* unknown or unsupported protocol */ 126 #define IP_STAT_DELIVERED 14 /* datagrams delivered to upper level */ 127 #define IP_STAT_LOCALOUT 15 /* total ip packets generated here */ 128 #define IP_STAT_ODROPPED 16 /* lost packets due to nobufs, etc. */ 129 #define IP_STAT_REASSEMBLED 17 /* total packets reassembled ok */ 130 #define IP_STAT_FRAGMENTED 18 /* datagrams successfully fragmented */ 131 #define IP_STAT_OFRAGMENTS 19 /* output fragments created */ 132 #define IP_STAT_CANTFRAG 20 /* don't fragment flag was set, etc. */ 133 #define IP_STAT_BADOPTIONS 21 /* error in option processing */ 134 #define IP_STAT_NOROUTE 22 /* packets discarded due to no route */ 135 #define IP_STAT_BADVERS 23 /* ip version != 4 */ 136 #define IP_STAT_RAWOUT 24 /* total raw ip packets generated */ 137 #define IP_STAT_BADFRAGS 25 /* malformed fragments (bad length) */ 138 #define IP_STAT_RCVMEMDROP 26 /* frags dropped for lack of memory */ 139 #define IP_STAT_TOOLONG 27 /* ip length > max ip packet size */ 140 #define IP_STAT_NOGIF 28 /* no match gif found */ 141 #define IP_STAT_BADADDR 29 /* invalid address on header */ 142 143 #define IP_NSTATS 30 144 145 #ifdef _KERNEL 146 147 #ifdef _KERNEL_OPT 148 #include "opt_gateway.h" 149 #include "opt_mbuftrace.h" 150 #endif 151 152 /* flags passed to ip_output as last parameter */ 153 #define IP_FORWARDING 0x1 /* most of ip header exists */ 154 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 155 #define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ 156 #define IP_NOIPNEWID 0x8 /* don't fill in ip_id */ 157 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 158 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 159 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 160 161 extern struct domain inetdomain; 162 163 extern int ip_defttl; /* default IP ttl */ 164 extern int ipforwarding; /* ip forwarding */ 165 extern int ip_mtudisc; /* mtu discovery */ 166 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 167 extern int anonportmin; /* minimum ephemeral port */ 168 extern int anonportmax; /* maximum ephemeral port */ 169 extern int lowportmin; /* minimum reserved port */ 170 extern int lowportmax; /* maximum reserved port */ 171 extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ 172 extern struct rttimer_queue *ip_mtudisc_timeout_q; 173 #ifdef MBUFTRACE 174 extern struct mowner ip_rx_mowner; 175 extern struct mowner ip_tx_mowner; 176 #endif 177 #ifdef GATEWAY 178 extern int ip_maxflows; 179 extern int ip_hashsize; 180 #endif 181 extern struct pool inmulti_pool; 182 struct inpcb; 183 struct sockopt; 184 185 int ip_ctloutput(int, struct socket *, struct sockopt *); 186 int ip_dooptions(struct mbuf *); 187 void ip_drain(void); 188 void ip_drainstub(void); 189 void ip_forward(struct mbuf *, int); 190 void ip_freemoptions(struct ip_moptions *); 191 int ip_getmoptions(struct ip_moptions *, struct sockopt *); 192 void ip_init(void); 193 int ip_optcopy(struct ip *, struct ip *); 194 u_int ip_optlen(struct inpcb *); 195 int ip_output(struct mbuf *, ...); 196 int ip_fragment(struct mbuf *, struct ifnet *, u_long); 197 int ip_pcbopts(struct mbuf **, const struct sockopt *); 198 199 void ip_reass_init(void); 200 int ip_reass_packet(struct mbuf **, struct ip *); 201 void ip_reass_slowtimo(void); 202 void ip_reass_drain(void); 203 204 struct in_ifaddr * 205 ip_rtaddr(struct in_addr); 206 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 207 struct mbuf *); 208 int ip_setmoptions(struct ip_moptions **, const struct sockopt *); 209 void ip_slowtimo(void); 210 void ip_fasttimo(void); 211 struct mbuf * 212 ip_srcroute(void); 213 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 214 void ip_statinc(u_int); 215 void ipintr(void); 216 void * rip_ctlinput(int, const struct sockaddr *, void *); 217 int rip_ctloutput(int, struct socket *, struct sockopt *); 218 void rip_init(void); 219 void rip_input(struct mbuf *, ...); 220 int rip_output(struct mbuf *, ...); 221 int rip_usrreq(struct socket *, 222 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); 223 int ipflow_init(int); 224 void ipflow_poolinit(void); 225 void ipflow_prune(void); 226 void ipflow_create(const struct route *, struct mbuf *); 227 void ipflow_slowtimo(void); 228 int ipflow_invalidate_all(int); 229 230 #endif /* _KERNEL */ 231 232 #endif /* !_NETINET_IP_VAR_H_ */ 233