| 1 | /* $NetBSD: ip_var.h,v 1.115 2016/08/01 10:22:53 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 | /* |
| 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 | #ifdef _KERNEL |
| 164 | |
| 165 | #ifdef _KERNEL_OPT |
| 166 | #include "opt_gateway.h" |
| 167 | #include "opt_mbuftrace.h" |
| 168 | #endif |
| 169 | |
| 170 | /* |
| 171 | * The following flags can be passed to ip_output() as last parameter |
| 172 | */ |
| 173 | #define IP_FORWARDING 0x0001 /* most of ip header exists */ |
| 174 | #define IP_RAWOUTPUT 0x0002 /* raw ip header exists */ |
| 175 | #define IP_RETURNMTU 0x0004 /* pass back mtu on EMSGSIZE */ |
| 176 | #define IP_NOIPNEWID 0x0008 /* don't fill in ip_id */ |
| 177 | __CTASSERT(SO_DONTROUTE == 0x0010); |
| 178 | __CTASSERT(SO_BROADCAST == 0x0020); |
| 179 | #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ |
| 180 | #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ |
| 181 | |
| 182 | #define IP_IGMP_MCAST 0x0040 /* IGMP for mcast join/leave */ |
| 183 | #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ |
| 184 | |
| 185 | extern struct domain inetdomain; |
| 186 | extern const struct pr_usrreqs rip_usrreqs; |
| 187 | |
| 188 | extern int ip_defttl; /* default IP ttl */ |
| 189 | extern int ipforwarding; /* ip forwarding */ |
| 190 | extern int ip_mtudisc; /* mtu discovery */ |
| 191 | extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ |
| 192 | extern int anonportmin; /* minimum ephemeral port */ |
| 193 | extern int anonportmax; /* maximum ephemeral port */ |
| 194 | extern int lowportmin; /* minimum reserved port */ |
| 195 | extern int lowportmax; /* maximum reserved port */ |
| 196 | extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ |
| 197 | extern struct rttimer_queue *ip_mtudisc_timeout_q; |
| 198 | #ifdef MBUFTRACE |
| 199 | extern struct mowner ip_rx_mowner; |
| 200 | extern struct mowner ip_tx_mowner; |
| 201 | #endif |
| 202 | struct inpcb; |
| 203 | struct sockopt; |
| 204 | |
| 205 | void ip_init(void); |
| 206 | void in_init(void); |
| 207 | |
| 208 | int ip_ctloutput(int, struct socket *, struct sockopt *); |
| 209 | void ip_drain(void); |
| 210 | void ip_drainstub(void); |
| 211 | void ip_freemoptions(struct ip_moptions *); |
| 212 | int ip_optcopy(struct ip *, struct ip *); |
| 213 | u_int ip_optlen(struct inpcb *); |
| 214 | int ip_output(struct mbuf *, struct mbuf *, struct route *, int, |
| 215 | struct ip_moptions *, struct socket *); |
| 216 | int ip_fragment(struct mbuf *, struct ifnet *, u_long); |
| 217 | |
| 218 | void ip_reass_init(void); |
| 219 | int ip_reass_packet(struct mbuf **, struct ip *); |
| 220 | void ip_reass_slowtimo(void); |
| 221 | void ip_reass_drain(void); |
| 222 | |
| 223 | void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, |
| 224 | struct mbuf *); |
| 225 | void ip_slowtimo(void); |
| 226 | void ip_fasttimo(void); |
| 227 | struct mbuf * |
| 228 | ip_srcroute(void); |
| 229 | int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); |
| 230 | void ip_statinc(u_int); |
| 231 | void * rip_ctlinput(int, const struct sockaddr *, void *); |
| 232 | int rip_ctloutput(int, struct socket *, struct sockopt *); |
| 233 | void rip_init(void); |
| 234 | void rip_input(struct mbuf *, ...); |
| 235 | int rip_output(struct mbuf *, struct inpcb *); |
| 236 | int rip_usrreq(struct socket *, |
| 237 | int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); |
| 238 | |
| 239 | int ip_setmoptions(struct ip_moptions **, const struct sockopt *sopt); |
| 240 | int ip_getmoptions(struct ip_moptions *, struct sockopt *sopt); |
| 241 | |
| 242 | int ip_if_output(struct ifnet * const, struct mbuf * const, |
| 243 | const struct sockaddr * const, const struct rtentry *); |
| 244 | |
| 245 | /* IP Flow interface. */ |
| 246 | void ipflow_init(void); |
| 247 | void ipflow_poolinit(void); |
| 248 | void ipflow_create(const struct route *, struct mbuf *); |
| 249 | void ipflow_slowtimo(void); |
| 250 | int ipflow_invalidate_all(int); |
| 251 | |
| 252 | #endif /* _KERNEL */ |
| 253 | |
| 254 | #endif /* !_NETINET_IP_VAR_H_ */ |
| 255 | |