1 /* $NetBSD: ip_var.h,v 1.76 2005/12/24 20:45:09 perry 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 } __attribute__((__packed__)); 50 51 /* 52 * Ip (reassembly or sequence) queue structures. 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_ip _ipqe_u1._ip 81 #define ipqe_tcp _ipqe_u1._tcp 82 83 /* 84 * Ip reassembly queue structure. Each fragment 85 * being reassembled is attached to one of these structures. 86 * They are timed out after ipq_ttl drops to 0, and may also 87 * be reclaimed if memory becomes tight. 88 */ 89 struct ipq { 90 LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ 91 u_int8_t ipq_ttl; /* time for reass q to live */ 92 u_int8_t ipq_p; /* protocol of this fragment */ 93 u_int16_t ipq_id; /* sequence id for reassembly */ 94 struct ipqehead ipq_fragq; /* to ip fragment queue */ 95 struct in_addr ipq_src, ipq_dst; 96 u_int16_t ipq_nfrags; /* frags in this queue entry */ 97 }; 98 99 /* 100 * Structure stored in mbuf in inpcb.ip_options 101 * and passed to ip_output when ip options are in use. 102 * The actual length of the options (including ipopt_dst) 103 * is in m_len. 104 */ 105 #define MAX_IPOPTLEN 40 106 107 struct ipoption { 108 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 109 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 110 }; 111 112 /* 113 * Structure attached to inpcb.ip_moptions and 114 * passed to ip_output when IP multicast options are in use. 115 */ 116 struct ip_moptions { 117 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ 118 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ 119 u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ 120 u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ 121 u_int16_t imo_num_memberships; /* no. memberships this socket */ 122 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; 123 }; 124 125 struct ipstat { 126 u_quad_t ips_total; /* total packets received */ 127 u_quad_t ips_badsum; /* checksum bad */ 128 u_quad_t ips_tooshort; /* packet too short */ 129 u_quad_t ips_toosmall; /* not enough data */ 130 u_quad_t ips_badhlen; /* ip header length < data size */ 131 u_quad_t ips_badlen; /* ip length < ip header length */ 132 u_quad_t ips_fragments; /* fragments received */ 133 u_quad_t ips_fragdropped; /* frags dropped (dups, out of space) */ 134 u_quad_t ips_fragtimeout; /* fragments timed out */ 135 u_quad_t ips_forward; /* packets forwarded */ 136 u_quad_t ips_fastforward; /* packets fast forwarded */ 137 u_quad_t ips_cantforward; /* packets rcvd for unreachable dest */ 138 u_quad_t ips_redirectsent; /* packets forwarded on same net */ 139 u_quad_t ips_noproto; /* unknown or unsupported protocol */ 140 u_quad_t ips_delivered; /* datagrams delivered to upper level*/ 141 u_quad_t ips_localout; /* total ip packets generated here */ 142 u_quad_t ips_odropped; /* lost packets due to nobufs, etc. */ 143 u_quad_t ips_reassembled; /* total packets reassembled ok */ 144 u_quad_t ips_fragmented; /* datagrams successfully fragmented */ 145 u_quad_t ips_ofragments; /* output fragments created */ 146 u_quad_t ips_cantfrag; /* don't fragment flag was set, etc. */ 147 u_quad_t ips_badoptions; /* error in option processing */ 148 u_quad_t ips_noroute; /* packets discarded due to no route */ 149 u_quad_t ips_badvers; /* ip version != 4 */ 150 u_quad_t ips_rawout; /* total raw ip packets generated */ 151 u_quad_t ips_badfrags; /* malformed fragments (bad length) */ 152 u_quad_t ips_rcvmemdrop; /* frags dropped for lack of memory */ 153 u_quad_t ips_toolong; /* ip length > max ip packet size */ 154 u_quad_t ips_nogif; /* no match gif found */ 155 u_quad_t ips_badaddr; /* invalid address on header */ 156 }; 157 158 #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */ 159 struct ipflow { 160 LIST_ENTRY(ipflow) ipf_list; /* next in active list */ 161 LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ 162 struct in_addr ipf_dst; /* destination address */ 163 struct in_addr ipf_src; /* source address */ 164 u_int8_t ipf_tos; /* type-of-service */ 165 struct route ipf_ro; /* associated route entry */ 166 u_long ipf_uses; /* number of uses in this period */ 167 u_long ipf_last_uses; /* number of uses in last period */ 168 u_long ipf_dropped; /* ENOBUFS returned by if_output */ 169 u_long ipf_errors; /* other errors returned by if_output */ 170 u_int ipf_timer; /* lifetime timer */ 171 time_t ipf_start; /* creation time */ 172 }; 173 174 #ifdef _KERNEL 175 176 #ifdef _KERNEL_OPT 177 #include "opt_gateway.h" 178 #include "opt_mbuftrace.h" 179 #endif 180 181 /* flags passed to ip_output as last parameter */ 182 #define IP_FORWARDING 0x1 /* most of ip header exists */ 183 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */ 184 #define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ 185 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ 186 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ 187 #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ 188 189 #ifdef __NO_STRICT_ALIGNMENT 190 #define IP_HDR_ALIGNED_P(ip) 1 191 #else 192 #define IP_HDR_ALIGNED_P(ip) ((((vaddr_t) (ip)) & 3) == 0) 193 #endif 194 195 extern struct domain inetdomain; 196 197 extern struct ipstat ipstat; /* ip statistics */ 198 extern LIST_HEAD(ipqhead, ipq) ipq[]; /* ip reass. queue */ 199 extern int ip_defttl; /* default IP ttl */ 200 extern int ipforwarding; /* ip forwarding */ 201 extern int ip_mtudisc; /* mtu discovery */ 202 extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ 203 extern int anonportmin; /* minimum ephemeral port */ 204 extern int anonportmax; /* maximum ephemeral port */ 205 extern int lowportmin; /* minimum reserved port */ 206 extern int lowportmax; /* maximum reserved port */ 207 extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ 208 extern struct rttimer_queue *ip_mtudisc_timeout_q; 209 #ifdef MBUFTRACE 210 extern struct mowner ip_rx_mowner; 211 extern struct mowner ip_tx_mowner; 212 #endif 213 #ifdef GATEWAY 214 extern int ip_maxflows; 215 #endif 216 extern struct pool inmulti_pool; 217 extern struct pool ipqent_pool; 218 struct inpcb; 219 220 int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); 221 int ip_dooptions(struct mbuf *); 222 void ip_drain(void); 223 void ip_forward(struct mbuf *, int); 224 void ip_freef(struct ipq *); 225 void ip_freemoptions(struct ip_moptions *); 226 int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); 227 void ip_init(void); 228 int ip_optcopy(struct ip *, struct ip *); 229 u_int ip_optlen(struct inpcb *); 230 int ip_output(struct mbuf *, ...); 231 int ip_fragment(struct mbuf *, struct ifnet *, u_long); 232 int ip_pcbopts(struct mbuf **, struct mbuf *); 233 struct mbuf * 234 ip_reass(struct ipqent *, struct ipq *, struct ipqhead *); 235 struct in_ifaddr * 236 ip_rtaddr(struct in_addr); 237 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, 238 struct mbuf *); 239 int ip_setmoptions(int, struct ip_moptions **, struct mbuf *); 240 void ip_slowtimo(void); 241 struct mbuf * 242 ip_srcroute(void); 243 void ip_stripoptions(struct mbuf *, struct mbuf *); 244 int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); 245 void ipintr(void); 246 void * rip_ctlinput(int, struct sockaddr *, void *); 247 int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); 248 void rip_init(void); 249 void rip_input(struct mbuf *, ...); 250 int rip_output(struct mbuf *, ...); 251 int rip_usrreq(struct socket *, 252 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); 253 void ipflow_init(void); 254 struct ipflow *ipflow_reap(int); 255 void ipflow_create(const struct route *, struct mbuf *); 256 void ipflow_slowtimo(void); 257 void ipflow_invalidate_all(void); 258 259 extern uint16_t ip_id; 260 static inline uint16_t ip_newid(void); 261 262 u_int16_t ip_randomid(void); 263 extern int ip_do_randomid; 264 265 /* 266 * ip_newid_range: "allocate" num contiguous ip_ids. 267 * 268 * => return the first id. 269 */ 270 271 static inline uint16_t 272 ip_newid_range(unsigned int num) 273 { 274 uint16_t id; 275 276 if (ip_do_randomid) { 277 /* XXX ignore num */ 278 return ip_randomid(); 279 } 280 281 id = htons(ip_id); 282 ip_id += num; 283 284 return id; 285 } 286 287 static inline uint16_t 288 ip_newid(void) 289 { 290 291 return ip_newid_range(1); 292 } 293 294 #endif /* _KERNEL */ 295 296 #endif /* !_NETINET_IP_VAR_H_ */ 297