in_var.h revision 1.69
1 /* $NetBSD: in_var.h,v 1.69 2014/06/05 23:48:16 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Public Access Networks Corporation ("Panix"). It was developed under 9 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1985, 1986, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in_var.h 8.2 (Berkeley) 1/9/95 62 */ 63 64 #ifndef _NETINET_IN_VAR_H_ 65 #define _NETINET_IN_VAR_H_ 66 67 #include <sys/queue.h> 68 69 /* 70 * Interface address, Internet version. One of these structures 71 * is allocated for each interface with an Internet address. 72 * The ifaddr structure contains the protocol-independent part 73 * of the structure and is assumed to be first. 74 */ 75 struct in_ifaddr { 76 struct ifaddr ia_ifa; /* protocol-independent info */ 77 #define ia_ifp ia_ifa.ifa_ifp 78 #define ia_flags ia_ifa.ifa_flags 79 /* ia_{,sub}net{,mask} in host order */ 80 u_int32_t ia_net; /* network number of interface */ 81 u_int32_t ia_netmask; /* mask of net part */ 82 u_int32_t ia_subnet; /* subnet number, including net */ 83 u_int32_t ia_subnetmask; /* mask of subnet part */ 84 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 85 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 86 TAILQ_ENTRY(in_ifaddr) ia_list; /* list of internet addresses */ 87 struct sockaddr_in ia_addr; /* reserve space for interface name */ 88 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 89 #define ia_broadaddr ia_dstaddr 90 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 91 LIST_HEAD(, in_multi) ia_multiaddrs; /* list of multicast addresses */ 92 struct in_multi *ia_allhosts; /* multicast address record for 93 the allhosts multicast group */ 94 uint16_t ia_idsalt; /* ip_id salt for this ia */ 95 }; 96 97 struct in_aliasreq { 98 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 99 struct sockaddr_in ifra_addr; 100 struct sockaddr_in ifra_dstaddr; 101 #define ifra_broadaddr ifra_dstaddr 102 struct sockaddr_in ifra_mask; 103 }; 104 /* 105 * Given a pointer to an in_ifaddr (ifaddr), 106 * return a pointer to the addr as a sockaddr_in. 107 */ 108 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 109 110 #ifdef _KERNEL 111 112 /* Note: 61, 127, 251, 509, 1021, 2039 are good. */ 113 #ifndef IN_IFADDR_HASH_SIZE 114 #define IN_IFADDR_HASH_SIZE 509 115 #endif 116 117 /* 118 * This is a bit unconventional, and wastes a little bit of space, but 119 * because we want a very even hash function we don't use & in_ifaddrhash 120 * here, but rather % the hash size, which should obviously be prime. 121 */ 122 123 #define IN_IFADDR_HASH(x) in_ifaddrhashtbl[(u_long)(x) % IN_IFADDR_HASH_SIZE] 124 125 LIST_HEAD(in_ifaddrhashhead, in_ifaddr); /* Type of the hash head */ 126 TAILQ_HEAD(in_ifaddrhead, in_ifaddr); /* Type of the list head */ 127 128 extern u_long in_ifaddrhash; /* size of hash table - 1 */ 129 extern struct in_ifaddrhashhead *in_ifaddrhashtbl; /* Hash table head */ 130 extern struct in_ifaddrhead in_ifaddrhead; /* List head (in ip_input) */ 131 132 extern const int inetctlerrmap[]; 133 134 /* 135 * Macro for finding whether an internet address (in_addr) belongs to one 136 * of our interfaces (in_ifaddr). NULL if the address isn't ours. 137 */ 138 #define INADDR_TO_IA(addr, ia) \ 139 /* struct in_addr addr; */ \ 140 /* struct in_ifaddr *ia; */ \ 141 { \ 142 LIST_FOREACH(ia, &IN_IFADDR_HASH((addr).s_addr), ia_hash) { \ 143 if (in_hosteq(ia->ia_addr.sin_addr, (addr))) \ 144 break; \ 145 } \ 146 } 147 148 /* 149 * Macro for finding the next in_ifaddr structure with the same internet 150 * address as ia. Call only with a valid ia pointer. 151 * Will set ia to NULL if none found. 152 */ 153 154 #define NEXT_IA_WITH_SAME_ADDR(ia) \ 155 /* struct in_ifaddr *ia; */ \ 156 { \ 157 struct in_addr addr; \ 158 addr = ia->ia_addr.sin_addr; \ 159 do { \ 160 ia = LIST_NEXT(ia, ia_hash); \ 161 } while ((ia != NULL) && !in_hosteq(ia->ia_addr.sin_addr, addr)); \ 162 } 163 164 /* 165 * Macro for finding the interface (ifnet structure) corresponding to one 166 * of our IP addresses. 167 */ 168 #define INADDR_TO_IFP(addr, ifp) \ 169 /* struct in_addr addr; */ \ 170 /* struct ifnet *ifp; */ \ 171 { \ 172 struct in_ifaddr *ia; \ 173 \ 174 INADDR_TO_IA(addr, ia); \ 175 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 176 } 177 178 /* 179 * Macro for finding an internet address structure (in_ifaddr) corresponding 180 * to a given interface (ifnet structure). 181 */ 182 #define IFP_TO_IA(ifp, ia) \ 183 /* struct ifnet *ifp; */ \ 184 /* struct in_ifaddr *ia; */ \ 185 { \ 186 struct ifaddr *ifa; \ 187 \ 188 IFADDR_FOREACH(ifa, ifp) { \ 189 if (ifa->ifa_addr->sa_family == AF_INET) \ 190 break; \ 191 } \ 192 (ia) = ifatoia(ifa); \ 193 } 194 #endif 195 196 /* 197 * Internet multicast address structure. There is one of these for each IP 198 * multicast group to which this host belongs on a given network interface. 199 * They are kept in a linked list, rooted in the interface's in_ifaddr 200 * structure. 201 */ 202 struct router_info; 203 204 struct in_multi { 205 LIST_ENTRY(in_multi) inm_list; /* list of multicast addresses */ 206 struct router_info *inm_rti; /* router version info */ 207 struct ifnet *inm_ifp; /* back pointer to ifnet */ 208 struct in_addr inm_addr; /* IP multicast address */ 209 u_int inm_refcount; /* no. membership claims by sockets */ 210 u_int inm_timer; /* IGMP membership report timer */ 211 u_int inm_state; /* state of membership */ 212 }; 213 214 #ifdef _KERNEL 215 216 #include <net/pktqueue.h> 217 218 extern pktqueue_t *ip_pktq; 219 220 /* 221 * Structure used by functions below to remember position when stepping 222 * through all of the in_multi records. 223 */ 224 struct in_multistep { 225 int i_n; 226 struct in_multi *i_inm; 227 }; 228 229 bool in_multi_group(struct in_addr, struct ifnet *, int); 230 struct in_multi *in_first_multi(struct in_multistep *); 231 struct in_multi *in_next_multi(struct in_multistep *); 232 struct in_multi *in_lookup_multi(struct in_addr, struct ifnet *); 233 struct in_multi *in_addmulti(struct in_addr *, struct ifnet *); 234 void in_delmulti(struct in_multi *); 235 236 void in_multi_lock(int); 237 void in_multi_unlock(void); 238 int in_multi_lock_held(void); 239 240 struct ifaddr; 241 242 int in_ifinit(struct ifnet *, 243 struct in_ifaddr *, const struct sockaddr_in *, int); 244 void in_savemkludge(struct in_ifaddr *); 245 void in_restoremkludge(struct in_ifaddr *, struct ifnet *); 246 void in_purgemkludge(struct ifnet *); 247 void in_ifscrub(struct ifnet *, struct in_ifaddr *); 248 void in_setmaxmtu(void); 249 const char *in_fmtaddr(struct in_addr); 250 int in_control(struct socket *, u_long, void *, struct ifnet *, 251 struct lwp *); 252 void in_purgeaddr(struct ifaddr *); 253 void in_purgeif(struct ifnet *); 254 int ipflow_fastforward(struct mbuf *); 255 256 struct ipid_state; 257 typedef struct ipid_state ipid_state_t; 258 259 ipid_state_t * ip_id_init(void); 260 void ip_id_fini(ipid_state_t *); 261 uint16_t ip_randomid(ipid_state_t *, uint16_t); 262 263 extern ipid_state_t * ip_ids; 264 extern uint16_t ip_id; 265 extern int ip_do_randomid; 266 267 /* 268 * ip_newid_range: "allocate" num contiguous IP IDs. 269 * 270 * => Return the first ID. 271 */ 272 static __inline uint16_t 273 ip_newid_range(const struct in_ifaddr *ia, u_int num) 274 { 275 uint16_t id; 276 277 if (ip_do_randomid) { 278 /* XXX ignore num */ 279 return ip_randomid(ip_ids, ia ? ia->ia_idsalt : 0); 280 } 281 282 /* Never allow an IP ID of 0 (detect wrap). */ 283 if ((uint16_t)(ip_id + num) < ip_id) { 284 ip_id = 1; 285 } 286 id = htons(ip_id); 287 ip_id += num; 288 return id; 289 } 290 291 static __inline uint16_t 292 ip_newid(const struct in_ifaddr *ia) 293 { 294 295 return ip_newid_range(ia, 1); 296 } 297 298 #ifdef SYSCTLFN_PROTO 299 int sysctl_inpcblist(SYSCTLFN_PROTO); 300 #endif 301 302 #endif /* !_KERNEL */ 303 304 /* INET6 stuff */ 305 #include <netinet6/in6_var.h> 306 307 #endif /* !_NETINET_IN_VAR_H_ */ 308
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