1 /* $NetBSD: ip_var.h,v 1.49 2002/09/11 02:41:20 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 TAILQ_HEAD(ipqehead, ipqent); 67 struct ipqent { 68 TAILQ_ENTRY(ipqent) ipqe_q; 69 union { 70 struct ip *_ip; 71 struct tcpiphdr *_tcp; 72 } _ipqe_u1; 73 struct mbuf *ipqe_m; /* point to first mbuf */ 74 struct mbuf *ipre_mlast; /* point to last mbuf */ 75 u_int8_t ipqe_mff; /* for IP fragmentation */ 76 /* 77 * The following are used in TCP reassembly 78 */ 79 TAILQ_ENTRY(ipqent) ipqe_timeq; 80 u_int32_t ipqe_seq; 81 u_int32_t ipqe_len; 82 u_int32_t ipqe_flags; 83 }; 84 #define ipqe_ip _ipqe_u1._ip 85 #define ipqe_tcp _ipqe_u1._tcp 86 87 /* 88 * Ip reassembly queue structure. Each fragment 89 * being reassembled is attached to one of these structures. 90 * They are timed out after ipq_ttl drops to 0, and may also 91 * be reclaimed if memory becomes tight. 92 */ 93 struct ipq { 94 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 95 u_int8_t ipq_ttl; /* time for reass q to live */ 96 u_int8_t ipq_p; /* protocol of this fragment */ 97 u_int16_t ipq_id; /* sequence id for reassembly */ 98 struct ipqehead ipq_fragq; /* to ip fragment queue */ 99 struct in_addr ipq_src, ipq_dst; 100 }; 101 102 /* 103 * Structure stored in mbuf in inpcb.ip_options 104 * and passed to ip_output when ip options are in use. 105 * The actual length of the options (including ipopt_dst) 106 * is in m_len. 107 */ 108 #define MAX_IPOPTLEN 40 109 110 struct ipoption { 111 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 112 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 113 }; 114 115 /* 116 * Structure attached to inpcb.ip_moptions and 117 * passed to ip_output when IP multicast options are in use. 118 */ 119 struct ip_moptions { 120 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 121 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 122 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 123 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 124 u_int16_t imo_num_memberships; /* no. memberships this socket */ 125 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 126 }; 127 128 struct ipstat { 129 u_quad_t ips_total; /* total packets received */ 130 u_quad_t ips_badsum; /* checksum bad */ 131 u_quad_t ips_tooshort; /* packet too short */ 132 u_quad_t ips_toosmall; /* not enough data */ 133 u_quad_t ips_badhlen; /* ip header length < data size */ 134 u_quad_t ips_badlen; /* ip length < ip header length */ 135 u_quad_t ips_fragments; /* fragments received */ 136 u_quad_t ips_fragdropped; /* frags dropped (dups, out of space) */ 137 u_quad_t ips_fragtimeout; /* fragments timed out */ 138 u_quad_t ips_forward; /* packets forwarded */ 139 u_quad_t ips_fastforward; /* packets fast forwarded */ 140 u_quad_t ips_cantforward; /* packets rcvd for unreachable dest */ 141 u_quad_t ips_redirectsent; /* packets forwarded on same net */ 142 u_quad_t ips_noproto; /* unknown or unsupported protocol */ 143 u_quad_t ips_delivered; /* datagrams delivered to upper level*/ 144 u_quad_t ips_localout; /* total ip packets generated here */ 145 u_quad_t ips_odropped; /* lost packets due to nobufs, etc. */ 146 u_quad_t ips_reassembled; /* total packets reassembled ok */ 147 u_quad_t ips_fragmented; /* datagrams sucessfully fragmented */ 148 u_quad_t ips_ofragments; /* output fragments created */ 149 u_quad_t ips_cantfrag; /* don't fragment flag was set, etc. */ 150 u_quad_t ips_badoptions; /* error in option processing */ 151 u_quad_t ips_noroute; /* packets discarded due to no route */ 152 u_quad_t ips_badvers; /* ip version != 4 */ 153 u_quad_t ips_rawout; /* total raw ip packets generated */ 154 u_quad_t ips_badfrags; /* malformed fragments (bad length) */ 155 u_quad_t ips_rcvmemdrop; /* frags dropped for lack of memory */ 156 u_quad_t ips_toolong; /* ip length > max ip packet size */ 157 u_quad_t ips_nogif; /* no match gif found */ 158 u_quad_t ips_badaddr; /* invalid address on header */ 159 }; 160 161 #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */ 162 struct ipflow { 163 LIST_ENTRY(ipflow) ipf_list; /* next in active list */ 164 LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ 165 struct in_addr ipf_dst; /* destination address */ 166 struct in_addr ipf_src; /* source address */ 167 u_int8_t ipf_tos; /* type-of-service */ 168 struct route ipf_ro; /* associated route entry */ 169 u_long ipf_uses; /* number of uses in this period */ 170 u_long ipf_last_uses; /* number of uses in last period */ 171 u_long ipf_dropped; /* ENOBUFS returned by if_output */ 172 u_long ipf_errors; /* other errors returned by if_output */ 173 u_int ipf_timer; /* lifetime timer */ 174 time_t ipf_start; /* creation time */ 175 }; 176 177 #ifdef _KERNEL 178 /* flags passed to ip_output as last parameter */ 179 #define IP_FORWARDING 0x1 /* most of ip header exists */ 180 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 181 #define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ 182 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 183 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 184 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 185 186 #ifdef __NO_STRICT_ALIGNMENT 187 #define IP_HDR_ALIGNED_P(ip) 1 188 #else 189 #define IP_HDR_ALIGNED_P(ip) ((((vaddr_t) (ip)) & 3) == 0) 190 #endif 191 192 extern struct ipstat ipstat; /* ip statistics */ 193 extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */ 194 extern u_int16_t ip_id; /* ip packet ctr, for ids */ 195 extern int ip_defttl; /* default IP ttl */ 196 extern int ipforwarding; /* ip forwarding */ 197 extern int ip_mtudisc; /* mtu discovery */ 198 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 199 extern int anonportmin; /* minimum ephemeral port */ 200 extern int anonportmax; /* maximum ephemeral port */ 201 extern int lowportmin; /* minimum reserved port */ 202 extern int lowportmax; /* maximum reserved port */ 203 extern struct rttimer_queue *ip_mtudisc_timeout_q; 204 #ifdef GATEWAY 205 extern int ip_maxflows; 206 #endif 207 extern struct pool ipqent_pool; 208 struct inpcb; 209 210 int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 211 int ip_dooptions __P((struct mbuf *)); 212 void ip_drain __P((void)); 213 void ip_forward __P((struct mbuf *, int)); 214 void ip_freef __P((struct ipq *)); 215 void ip_freemoptions __P((struct ip_moptions *)); 216 int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **)); 217 void ip_init __P((void)); 218 int ip_optcopy __P((struct ip *, struct ip *)); 219 u_int ip_optlen __P((struct inpcb *)); 220 int ip_output __P((struct mbuf *, ...)); 221 int ip_pcbopts __P((struct mbuf **, struct mbuf *)); 222 struct mbuf * 223 ip_reass __P((struct ipqent *, struct ipq *)); 224 struct in_ifaddr * 225 ip_rtaddr __P((struct in_addr)); 226 void ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *, 227 struct mbuf *)); 228 int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *)); 229 void ip_slowtimo __P((void)); 230 struct mbuf * 231 ip_srcroute __P((void)); 232 void ip_stripoptions __P((struct mbuf *, struct mbuf *)); 233 int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 234 void ipintr __P((void)); 235 void * rip_ctlinput __P((int, struct sockaddr *, void *)); 236 int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 237 void rip_init __P((void)); 238 void rip_input __P((struct mbuf *, ...)); 239 int rip_output __P((struct mbuf *, ...)); 240 int rip_usrreq __P((struct socket *, 241 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 242 void ipflow_init __P((void)); 243 struct ipflow *ipflow_reap __P((int)); 244 void ipflow_create __P((const struct route *, struct mbuf *)); 245 void ipflow_slowtimo __P((void)); 246 #endif 247 248 #endif /* _NETINET_IP_VAR_H_ */ 249