1 /* $NetBSD: ip_var.h,v 1.134 2022/04/10 09:50:46 andvar 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 }; 50 #ifdef __CTASSERT 51 __CTASSERT(sizeof(struct ipovly) == 20); 52 #endif 53 54 /* 55 * IP Flow structure 56 */ 57 struct ipflow { 58 TAILQ_ENTRY(ipflow) ipf_list; /* next in active list */ 59 TAILQ_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ 60 size_t ipf_hashidx; /* own hash index of ipflowtable[] */ 61 struct in_addr ipf_dst; /* destination address */ 62 struct in_addr ipf_src; /* source address */ 63 uint8_t ipf_tos; /* type-of-service */ 64 struct route ipf_ro; /* associated route entry */ 65 u_long ipf_uses; /* number of uses in this period */ 66 u_long ipf_last_uses; /* number of uses in last period */ 67 u_long ipf_dropped; /* ENOBUFS returned by if_output */ 68 u_long ipf_errors; /* other errors returned by if_output */ 69 u_int ipf_timer; /* lifetime timer */ 70 }; 71 72 /* 73 * TCP sequence queue structure. 74 */ 75 TAILQ_HEAD(ipqehead, ipqent); 76 struct ipqent { 77 TAILQ_ENTRY(ipqent) ipqe_q; 78 struct mbuf *ipqe_m; 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 85 /* 86 * Structure stored in mbuf in inpcb.ip_options 87 * and passed to ip_output when ip options are in use. 88 * The actual length of the options (including ipopt_dst) 89 * is in m_len. 90 */ 91 #define MAX_IPOPTLEN 40 92 93 struct ipoption { 94 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 95 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 96 }; 97 98 /* 99 * Structure attached to inpcb.ip_moptions and 100 * passed to ip_output when IP multicast options are in use. 101 */ 102 struct ip_moptions { 103 if_index_t imo_multicast_if_index; /* I/F for outgoing multicasts */ 104 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 105 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 106 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 107 u_int16_t imo_num_memberships; /* no. memberships this socket */ 108 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 109 }; 110 111 struct ip_pktopts { 112 struct sockaddr_in ippo_laddr; /* source address */ 113 struct ip_moptions *ippo_imo; /* inp->inp_moptions or &ippo_imobuf */ 114 struct ip_moptions ippo_imobuf; /* use when IP_PKTINFO */ 115 }; 116 117 /* 118 * IP statistics. 119 * Each counter is an unsigned 64-bit value. 120 */ 121 #define IP_STAT_TOTAL 0 /* total packets received */ 122 #define IP_STAT_BADSUM 1 /* checksum bad */ 123 #define IP_STAT_TOOSHORT 2 /* packet too short */ 124 #define IP_STAT_TOOSMALL 3 /* not enough data */ 125 #define IP_STAT_BADHLEN 4 /* ip header length < data size */ 126 #define IP_STAT_BADLEN 5 /* ip length < ip header length */ 127 #define IP_STAT_FRAGMENTS 6 /* fragments received */ 128 #define IP_STAT_FRAGDROPPED 7 /* frags dropped (dups, out of space) */ 129 #define IP_STAT_FRAGTIMEOUT 8 /* fragments timed out */ 130 #define IP_STAT_FORWARD 9 /* packets forwarded */ 131 #define IP_STAT_FASTFORWARD 10 /* packets fast forwarded */ 132 #define IP_STAT_CANTFORWARD 11 /* packets rcvd for unreachable dest */ 133 #define IP_STAT_REDIRECTSENT 12 /* packets forwareded on same net */ 134 #define IP_STAT_NOPROTO 13 /* unknown or unsupported protocol */ 135 #define IP_STAT_DELIVERED 14 /* datagrams delivered to upper level */ 136 #define IP_STAT_LOCALOUT 15 /* total ip packets generated here */ 137 #define IP_STAT_ODROPPED 16 /* lost packets due to nobufs, etc. */ 138 #define IP_STAT_REASSEMBLED 17 /* total packets reassembled ok */ 139 #define IP_STAT_FRAGMENTED 18 /* datagrams successfully fragmented */ 140 #define IP_STAT_OFRAGMENTS 19 /* output fragments created */ 141 #define IP_STAT_CANTFRAG 20 /* don't fragment flag was set, etc. */ 142 #define IP_STAT_BADOPTIONS 21 /* error in option processing */ 143 #define IP_STAT_NOROUTE 22 /* packets discarded due to no route */ 144 #define IP_STAT_BADVERS 23 /* ip version != 4 */ 145 #define IP_STAT_RAWOUT 24 /* total raw ip packets generated */ 146 #define IP_STAT_BADFRAGS 25 /* malformed fragments (bad length) */ 147 #define IP_STAT_RCVMEMDROP 26 /* frags dropped for lack of memory */ 148 #define IP_STAT_TOOLONG 27 /* ip length > max ip packet size */ 149 #define IP_STAT_NOGIF 28 /* no match gif found */ 150 #define IP_STAT_BADADDR 29 /* invalid address on header */ 151 #define IP_STAT_NOL2TP 30 /* no match l2tp found */ 152 #define IP_STAT_NOIPSEC 31 /* no match ipsec(4) found */ 153 #define IP_STAT_PFILDROP_IN 32 /* dropped by pfil (PFIL_IN) */ 154 #define IP_STAT_PFILDROP_OUT 33 /* dropped by pfil (PFIL_OUT) */ 155 #define IP_STAT_IPSECDROP_IN 34 /* dropped by IPsec SP check */ 156 #define IP_STAT_IPSECDROP_OUT 35 /* dropped by IPsec SP check */ 157 #define IP_STAT_IFDROP 36 /* dropped due to interface state */ 158 #define IP_STAT_TIMXCEED 37 /* time to live exceeded */ 159 #define IP_STAT_IFNOADDR 38 /* interface has no IP address */ 160 #define IP_STAT_RTREJECT 39 /* rejected by route */ 161 #define IP_STAT_BCASTDENIED 40 /* broadcast prohibited */ 162 163 #define IP_NSTATS 41 164 165 #ifdef _KERNEL 166 167 #ifdef _KERNEL_OPT 168 #include "opt_gateway.h" 169 #include "opt_mbuftrace.h" 170 #endif 171 172 /* 173 * The following flags can be passed to ip_output() as last parameter 174 */ 175 #define IP_FORWARDING 0x0001 /* most of ip header exists */ 176 #define IP_RAWOUTPUT 0x0002 /* raw ip header exists */ 177 #define IP_RETURNMTU 0x0004 /* pass back mtu on EMSGSIZE */ 178 #define IP_NOIPNEWID 0x0008 /* don't fill in ip_id */ 179 __CTASSERT(SO_DONTROUTE == 0x0010); 180 __CTASSERT(SO_BROADCAST == 0x0020); 181 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 182 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 183 184 #define IP_IGMP_MCAST 0x0040 /* IGMP for mcast join/leave */ 185 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 186 #define IP_ROUTETOIFINDEX 0x0800 /* force route imo_multicast_if_index */ 187 188 extern struct domain inetdomain; 189 extern const struct pr_usrreqs rip_usrreqs; 190 191 extern int ip_defttl; /* default IP ttl */ 192 extern int ipforwarding; /* ip forwarding */ 193 extern int ip_mtudisc; /* mtu discovery */ 194 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 195 extern int anonportmin; /* minimum ephemeral port */ 196 extern int anonportmax; /* maximum ephemeral port */ 197 extern int lowportmin; /* minimum reserved port */ 198 extern int lowportmax; /* maximum reserved port */ 199 extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ 200 extern struct rttimer_queue *ip_mtudisc_timeout_q; 201 #ifdef MBUFTRACE 202 extern struct mowner ip_rx_mowner; 203 extern struct mowner ip_tx_mowner; 204 #endif 205 struct inpcb; 206 struct sockopt; 207 208 void ip_init(void); 209 void in_init(void); 210 211 int ip_ctloutput(int, struct socket *, struct sockopt *); 212 int ip_setpktopts(struct mbuf *, struct ip_pktopts *, int *, 213 struct inpcb *, kauth_cred_t); 214 void ip_drain(void); 215 void ip_drainstub(void); 216 void ip_freemoptions(struct ip_moptions *); 217 int ip_optcopy(struct ip *, struct ip *); 218 u_int ip_optlen(struct inpcb *); 219 int ip_output(struct mbuf *, struct mbuf *, struct route *, int, 220 struct ip_moptions *, struct inpcb *); 221 int ip_fragment(struct mbuf *, struct ifnet *, u_long); 222 223 void ip_reass_init(void); 224 int ip_reass_packet(struct mbuf **); 225 void ip_reass_slowtimo(void); 226 void ip_reass_drain(void); 227 228 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 229 struct mbuf *); 230 void ip_slowtimo(void); 231 void ip_fasttimo(void); 232 struct mbuf * 233 ip_srcroute(struct mbuf *); 234 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 235 void ip_statinc(u_int); 236 void * rip_ctlinput(int, const struct sockaddr *, void *); 237 int rip_ctloutput(int, struct socket *, struct sockopt *); 238 void rip_init(void); 239 void rip_input(struct mbuf *, int, int); 240 int rip_output(struct mbuf *, struct inpcb *, struct mbuf *, struct lwp *); 241 int rip_usrreq(struct socket *, 242 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); 243 244 int ip_setmoptions(struct ip_moptions **, const struct sockopt *sopt); 245 int ip_getmoptions(struct ip_moptions *, struct sockopt *sopt); 246 247 int ip_if_output(struct ifnet * const, struct mbuf * const, 248 const struct sockaddr * const, const struct rtentry *); 249 250 /* IP Flow interface. */ 251 void ipflow_init(void); 252 void ipflow_poolinit(void); 253 void ipflow_create(struct route *, struct mbuf *); 254 void ipflow_slowtimo(void); 255 int ipflow_invalidate_all(int); 256 257 #endif /* _KERNEL */ 258 259 #endif /* !_NETINET_IP_VAR_H_ */ 260