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 * $FreeBSD$ 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 */ 45 struct 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 63 struct 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 82 extern u_char inetctlerrmap[]; 83 84 /* 85 * Hash table for IP addresses. 86 */ 87 extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl; 88 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead; 89 extern 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 * Macro for finding the internet address structure (in_ifaddr) 99 * corresponding to one of our IP addresses (in_addr). 100 */ 101 #define INADDR_TO_IFADDR(addr, ia) \ 102 /* struct in_addr addr; */ \ 103 /* struct in_ifaddr *ia; */ \ 104 do { \ 105 \ 106 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \ 107 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 108 break; \ 109 } while (0) 110 111 /* 112 * Macro for finding the interface (ifnet structure) corresponding to one 113 * of our IP addresses. 114 */ 115 #define INADDR_TO_IFP(addr, ifp) \ 116 /* struct in_addr addr; */ \ 117 /* struct ifnet *ifp; */ \ 118 { \ 119 struct in_ifaddr *ia; \ 120 \ 121 INADDR_TO_IFADDR(addr, ia); \ 122 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 123 } 124 125 /* 126 * Macro for finding the internet address structure (in_ifaddr) corresponding 127 * to a given interface (ifnet structure). 128 */ 129 #define IFP_TO_IA(ifp, ia) \ 130 /* struct ifnet *ifp; */ \ 131 /* struct in_ifaddr *ia; */ \ 132 { \ 133 for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \ 134 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 135 (ia) = TAILQ_NEXT((ia), ia_link)) \ 136 continue; \ 137 } 138 #endif 139 140 /* 141 * This information should be part of the ifnet structure but we don't wish 142 * to change that - as it might break a number of things 143 */ 144 145 struct router_info { 146 struct ifnet *rti_ifp; 147 int rti_type; /* type of router which is querier on this interface */ 148 int rti_time; /* # of slow timeouts since last old query */ 149 SLIST_ENTRY(router_info) rti_list; 150 }; 151 152 /* 153 * Internet multicast address structure. There is one of these for each IP 154 * multicast group to which this host belongs on a given network interface. 155 * For every entry on the interface's if_multiaddrs list which represents 156 * an IP multicast group, there is one of these structures. They are also 157 * kept on a system-wide list to make it easier to keep our legacy IGMP code 158 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below). 159 */ 160 struct in_multi { 161 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */ 162 struct in_addr inm_addr; /* IP multicast address, convenience */ 163 struct ifnet *inm_ifp; /* back pointer to ifnet */ 164 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 165 u_int inm_timer; /* IGMP membership report timer */ 166 u_int inm_state; /* state of the membership */ 167 struct router_info *inm_rti; /* router info*/ 168 u_int inm_refcount; /* reference count */ 169 }; 170 171 #ifdef _KERNEL 172 173 #ifdef SYSCTL_DECL 174 SYSCTL_DECL(_net_inet); 175 SYSCTL_DECL(_net_inet_ip); 176 SYSCTL_DECL(_net_inet_raw); 177 #endif 178 179 extern LIST_HEAD(in_multihead, in_multi) in_multihead; 180 181 /* 182 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes 183 * before link layer multicast locks in the lock order. In most cases, 184 * consumers of IN_*_MULTI() macros should acquire the locks before 185 * calling them; users of the in_{add,del}multi() functions should not. 186 */ 187 extern struct mtx in_multi_mtx; 188 #define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx) 189 #define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx) 190 #define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED) 191 192 /* 193 * Structure used by macros below to remember position when stepping through 194 * all of the in_multi records. 195 */ 196 struct in_multistep { 197 struct in_multi *i_inm; 198 }; 199 200 /* 201 * Macro for looking up the in_multi record for a given IP multicast address 202 * on a given interface. If no matching record is found, "inm" is set null. 203 */ 204 #define IN_LOOKUP_MULTI(addr, ifp, inm) \ 205 /* struct in_addr addr; */ \ 206 /* struct ifnet *ifp; */ \ 207 /* struct in_multi *inm; */ \ 208 do { \ 209 struct ifmultiaddr *ifma; \ 210 \ 211 IN_MULTI_LOCK_ASSERT(); \ 212 IF_ADDR_LOCK(ifp); \ 213 TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \ 214 if (ifma->ifma_addr->sa_family == AF_INET \ 215 && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \ 216 (addr).s_addr) \ 217 break; \ 218 } \ 219 (inm) = ifma ? ifma->ifma_protospec : 0; \ 220 IF_ADDR_UNLOCK(ifp); \ 221 } while(0) 222 223 /* 224 * Macro to step through all of the in_multi records, one at a time. 225 * The current position is remembered in "step", which the caller must 226 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 227 * and get the first record. Both macros return a NULL "inm" when there 228 * are no remaining records. 229 */ 230 #define IN_NEXT_MULTI(step, inm) \ 231 /* struct in_multistep step; */ \ 232 /* struct in_multi *inm; */ \ 233 do { \ 234 IN_MULTI_LOCK_ASSERT(); \ 235 if (((inm) = (step).i_inm) != NULL) \ 236 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \ 237 } while(0) 238 239 #define IN_FIRST_MULTI(step, inm) \ 240 /* struct in_multistep step; */ \ 241 /* struct in_multi *inm; */ \ 242 do { \ 243 IN_MULTI_LOCK_ASSERT(); \ 244 (step).i_inm = LIST_FIRST(&in_multihead); \ 245 IN_NEXT_MULTI((step), (inm)); \ 246 } while(0) 247 248 struct route; 249 struct in_multi *in_addmulti(struct in_addr *, struct ifnet *); 250 void in_delmulti(struct in_multi *); 251 void in_delmulti_locked(struct in_multi *); 252 int in_control(struct socket *, u_long, caddr_t, struct ifnet *, 253 struct thread *); 254 void in_rtqdrain(void); 255 void ip_input(struct mbuf *); 256 int in_ifadown(struct ifaddr *ifa, int); 257 void in_ifscrub(struct ifnet *, struct in_ifaddr *); 258 struct mbuf *ip_fastforward(struct mbuf *); 259 260 #endif /* _KERNEL */ 261 262 /* INET6 stuff */ 263 #include <netinet6/in6_var.h> 264 265 #endif /* _NETINET_IN_VAR_H_ */ 266