in_var.h revision 139823
1/*- 2 * Copyright (c) 1985, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)in_var.h 8.2 (Berkeley) 1/9/95 30 * $FreeBSD: head/sys/netinet/in_var.h 139823 2005-01-07 01:45:51Z imp $ 31 */ 32 33#ifndef _NETINET_IN_VAR_H_ 34#define _NETINET_IN_VAR_H_ 35 36#include <sys/queue.h> 37#include <sys/fnv_hash.h> 38 39/* 40 * Interface address, Internet version. One of these structures 41 * is allocated for each Internet address on an interface. 42 * The ifaddr structure contains the protocol-independent part 43 * of the structure and is assumed to be first. 44 */ 45struct in_ifaddr { 46 struct ifaddr ia_ifa; /* protocol-independent info */ 47#define ia_ifp ia_ifa.ifa_ifp 48#define ia_flags ia_ifa.ifa_flags 49 /* ia_{,sub}net{,mask} in host order */ 50 u_long ia_net; /* network number of interface */ 51 u_long ia_netmask; /* mask of net part */ 52 u_long ia_subnet; /* subnet number, including net */ 53 u_long ia_subnetmask; /* mask of subnet part */ 54 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 55 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 56 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */ 57 struct sockaddr_in ia_addr; /* reserve space for interface name */ 58 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 59#define ia_broadaddr ia_dstaddr 60 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 61}; 62 63struct in_aliasreq { 64 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 65 struct sockaddr_in ifra_addr; 66 struct sockaddr_in ifra_broadaddr; 67#define ifra_dstaddr ifra_broadaddr 68 struct sockaddr_in ifra_mask; 69}; 70/* 71 * Given a pointer to an in_ifaddr (ifaddr), 72 * return a pointer to the addr as a sockaddr_in. 73 */ 74#define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 75#define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 76 77#define IN_LNAOF(in, ifa) \ 78 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 79 80 81#ifdef _KERNEL 82extern u_char inetctlerrmap[]; 83 84/* 85 * Hash table for IP addresses. 86 */ 87extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl; 88extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead; 89extern u_long in_ifaddrhmask; /* mask for hash table */ 90 91#define INADDR_NHASH_LOG2 9 92#define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 93#define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 94#define INADDR_HASH(x) \ 95 (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask]) 96 97 98/* 99 * Macro for finding the interface (ifnet structure) corresponding to one 100 * of our IP addresses. 101 */ 102#define INADDR_TO_IFP(addr, ifp) \ 103 /* struct in_addr addr; */ \ 104 /* struct ifnet *ifp; */ \ 105{ \ 106 struct in_ifaddr *ia; \ 107\ 108 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \ 109 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 110 break; \ 111 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 112} 113 114/* 115 * Macro for finding the internet address structure (in_ifaddr) corresponding 116 * to a given interface (ifnet structure). 117 */ 118#define IFP_TO_IA(ifp, ia) \ 119 /* struct ifnet *ifp; */ \ 120 /* struct in_ifaddr *ia; */ \ 121{ \ 122 for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \ 123 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 124 (ia) = TAILQ_NEXT((ia), ia_link)) \ 125 continue; \ 126} 127#endif 128 129/* 130 * This information should be part of the ifnet structure but we don't wish 131 * to change that - as it might break a number of things 132 */ 133 134struct router_info { 135 struct ifnet *rti_ifp; 136 int rti_type; /* type of router which is querier on this interface */ 137 int rti_time; /* # of slow timeouts since last old query */ 138 SLIST_ENTRY(router_info) rti_list; 139}; 140 141/* 142 * Internet multicast address structure. There is one of these for each IP 143 * multicast group to which this host belongs on a given network interface. 144 * For every entry on the interface's if_multiaddrs list which represents 145 * an IP multicast group, there is one of these structures. They are also 146 * kept on a system-wide list to make it easier to keep our legacy IGMP code 147 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below). 148 */ 149struct in_multi { 150 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */ 151 struct in_addr inm_addr; /* IP multicast address, convenience */ 152 struct ifnet *inm_ifp; /* back pointer to ifnet */ 153 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 154 u_int inm_timer; /* IGMP membership report timer */ 155 u_int inm_state; /* state of the membership */ 156 struct router_info *inm_rti; /* router info*/ 157}; 158 159#ifdef _KERNEL 160 161#ifdef SYSCTL_DECL 162SYSCTL_DECL(_net_inet); 163SYSCTL_DECL(_net_inet_ip); 164SYSCTL_DECL(_net_inet_raw); 165#endif 166 167extern LIST_HEAD(in_multihead, in_multi) in_multihead; 168 169/* 170 * Structure used by macros below to remember position when stepping through 171 * all of the in_multi records. 172 */ 173struct in_multistep { 174 struct in_multi *i_inm; 175}; 176 177/* 178 * Macro for looking up the in_multi record for a given IP multicast address 179 * on a given interface. If no matching record is found, "inm" is set null. 180 */ 181#define IN_LOOKUP_MULTI(addr, ifp, inm) \ 182 /* struct in_addr addr; */ \ 183 /* struct ifnet *ifp; */ \ 184 /* struct in_multi *inm; */ \ 185do { \ 186 struct ifmultiaddr *ifma; \ 187\ 188 TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \ 189 if (ifma->ifma_addr->sa_family == AF_INET \ 190 && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \ 191 (addr).s_addr) \ 192 break; \ 193 } \ 194 (inm) = ifma ? ifma->ifma_protospec : 0; \ 195} while(0) 196 197/* 198 * Macro to step through all of the in_multi records, one at a time. 199 * The current position is remembered in "step", which the caller must 200 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 201 * and get the first record. Both macros return a NULL "inm" when there 202 * are no remaining records. 203 */ 204#define IN_NEXT_MULTI(step, inm) \ 205 /* struct in_multistep step; */ \ 206 /* struct in_multi *inm; */ \ 207do { \ 208 if (((inm) = (step).i_inm) != NULL) \ 209 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \ 210} while(0) 211 212#define IN_FIRST_MULTI(step, inm) \ 213 /* struct in_multistep step; */ \ 214 /* struct in_multi *inm; */ \ 215do { \ 216 (step).i_inm = LIST_FIRST(&in_multihead); \ 217 IN_NEXT_MULTI((step), (inm)); \ 218} while(0) 219 220struct route; 221struct in_multi *in_addmulti(struct in_addr *, struct ifnet *); 222void in_delmulti(struct in_multi *); 223int in_control(struct socket *, u_long, caddr_t, struct ifnet *, 224 struct thread *); 225void in_rtqdrain(void); 226void ip_input(struct mbuf *); 227int in_ifadown(struct ifaddr *ifa, int); 228void in_ifscrub(struct ifnet *, struct in_ifaddr *); 229int ip_fastforward(struct mbuf *); 230 231#endif /* _KERNEL */ 232 233/* INET6 stuff */ 234#include <netinet6/in6_var.h> 235 236#endif /* _NETINET_IN_VAR_H_ */ 237