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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)in_var.h 8.2 (Berkeley) 1/9/95 34 * $FreeBSD$ 35 */ 36 37 #ifndef _NETINET_IN_VAR_H_ 38 #define _NETINET_IN_VAR_H_ 39 40 #include <sys/queue.h> 41 #include <sys/fnv_hash.h> 42 43 /* 44 * Interface address, Internet version. One of these structures 45 * is allocated for each Internet address on an interface. 46 * The ifaddr structure contains the protocol-independent part 47 * of the structure and is assumed to be first. 48 */ 49 struct in_ifaddr { 50 struct ifaddr ia_ifa; /* protocol-independent info */ 51 #define ia_ifp ia_ifa.ifa_ifp 52 #define ia_flags ia_ifa.ifa_flags 53 /* ia_{,sub}net{,mask} in host order */ 54 u_long ia_net; /* network number of interface */ 55 u_long ia_netmask; /* mask of net part */ 56 u_long ia_subnet; /* subnet number, including net */ 57 u_long ia_subnetmask; /* mask of subnet part */ 58 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 59 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 60 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */ 61 struct sockaddr_in ia_addr; /* reserve space for interface name */ 62 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 63 #define ia_broadaddr ia_dstaddr 64 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 65 }; 66 67 struct in_aliasreq { 68 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 69 struct sockaddr_in ifra_addr; 70 struct sockaddr_in ifra_broadaddr; 71 #define ifra_dstaddr ifra_broadaddr 72 struct sockaddr_in ifra_mask; 73 }; 74 /* 75 * Given a pointer to an in_ifaddr (ifaddr), 76 * return a pointer to the addr as a sockaddr_in. 77 */ 78 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 79 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 80 81 #define IN_LNAOF(in, ifa) \ 82 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 83 84 85 #ifdef _KERNEL 86 extern u_char inetctlerrmap[]; 87 88 /* 89 * Hash table for IP addresses. 90 */ 91 extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl; 92 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead; 93 extern u_long in_ifaddrhmask; /* mask for hash table */ 94 95 #define INADDR_NHASH_LOG2 9 96 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 97 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 98 #define INADDR_HASH(x) \ 99 (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask]) 100 101 102 /* 103 * Macro for finding the interface (ifnet structure) corresponding to one 104 * of our IP addresses. 105 */ 106 #define INADDR_TO_IFP(addr, ifp) \ 107 /* struct in_addr addr; */ \ 108 /* struct ifnet *ifp; */ \ 109 { \ 110 struct in_ifaddr *ia; \ 111 \ 112 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \ 113 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 114 break; \ 115 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 116 } 117 118 /* 119 * Macro for finding the internet address structure (in_ifaddr) corresponding 120 * to a given interface (ifnet structure). 121 */ 122 #define IFP_TO_IA(ifp, ia) \ 123 /* struct ifnet *ifp; */ \ 124 /* struct in_ifaddr *ia; */ \ 125 { \ 126 for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \ 127 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 128 (ia) = TAILQ_NEXT((ia), ia_link)) \ 129 continue; \ 130 } 131 #endif 132 133 /* 134 * This information should be part of the ifnet structure but we don't wish 135 * to change that - as it might break a number of things 136 */ 137 138 struct router_info { 139 struct ifnet *rti_ifp; 140 int rti_type; /* type of router which is querier on this interface */ 141 int rti_time; /* # of slow timeouts since last old query */ 142 SLIST_ENTRY(router_info) rti_list; 143 }; 144 145 /* 146 * Internet multicast address structure. There is one of these for each IP 147 * multicast group to which this host belongs on a given network interface. 148 * For every entry on the interface's if_multiaddrs list which represents 149 * an IP multicast group, there is one of these structures. They are also 150 * kept on a system-wide list to make it easier to keep our legacy IGMP code 151 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below). 152 */ 153 struct in_multi { 154 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */ 155 struct in_addr inm_addr; /* IP multicast address, convenience */ 156 struct ifnet *inm_ifp; /* back pointer to ifnet */ 157 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 158 u_int inm_timer; /* IGMP membership report timer */ 159 u_int inm_state; /* state of the membership */ 160 struct router_info *inm_rti; /* router info*/ 161 }; 162 163 #ifdef _KERNEL 164 165 #ifdef SYSCTL_DECL 166 SYSCTL_DECL(_net_inet_ip); 167 SYSCTL_DECL(_net_inet_raw); 168 #endif 169 170 extern LIST_HEAD(in_multihead, in_multi) in_multihead; 171 172 /* 173 * Structure used by macros below to remember position when stepping through 174 * all of the in_multi records. 175 */ 176 struct in_multistep { 177 struct in_multi *i_inm; 178 }; 179 180 /* 181 * Macro for looking up the in_multi record for a given IP multicast address 182 * on a given interface. If no matching record is found, "inm" is set null. 183 */ 184 #define IN_LOOKUP_MULTI(addr, ifp, inm) \ 185 /* struct in_addr addr; */ \ 186 /* struct ifnet *ifp; */ \ 187 /* struct in_multi *inm; */ \ 188 do { \ 189 struct ifmultiaddr *ifma; \ 190 \ 191 TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \ 192 if (ifma->ifma_addr->sa_family == AF_INET \ 193 && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \ 194 (addr).s_addr) \ 195 break; \ 196 } \ 197 (inm) = ifma ? ifma->ifma_protospec : 0; \ 198 } while(0) 199 200 /* 201 * Macro to step through all of the in_multi records, one at a time. 202 * The current position is remembered in "step", which the caller must 203 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 204 * and get the first record. Both macros return a NULL "inm" when there 205 * are no remaining records. 206 */ 207 #define IN_NEXT_MULTI(step, inm) \ 208 /* struct in_multistep step; */ \ 209 /* struct in_multi *inm; */ \ 210 do { \ 211 if (((inm) = (step).i_inm) != NULL) \ 212 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \ 213 } while(0) 214 215 #define IN_FIRST_MULTI(step, inm) \ 216 /* struct in_multistep step; */ \ 217 /* struct in_multi *inm; */ \ 218 do { \ 219 (step).i_inm = LIST_FIRST(&in_multihead); \ 220 IN_NEXT_MULTI((step), (inm)); \ 221 } while(0) 222 223 struct route; 224 struct in_multi *in_addmulti(struct in_addr *, struct ifnet *); 225 void in_delmulti(struct in_multi *); 226 int in_control(struct socket *, u_long, caddr_t, struct ifnet *, 227 struct thread *); 228 void in_rtqdrain(void); 229 void ip_input(struct mbuf *); 230 int in_ifadown(struct ifaddr *ifa, int); 231 void in_ifscrub(struct ifnet *, struct in_ifaddr *); 232 int ip_fastforward(struct mbuf *); 233 234 #endif /* _KERNEL */ 235 236 /* INET6 stuff */ 237 #include <netinet6/in6_var.h> 238 239 #endif /* _NETINET_IN_VAR_H_ */ 240