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. 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: src/sys/netinet/in_var.h,v 1.33.2.3 2001/12/14 20:09:34 jlemon Exp $ 31 * $DragonFly: src/sys/netinet/in_var.h,v 1.16 2008/10/26 07:11:28 sephe Exp $ 32 */ 33 34 #ifndef _NETINET_IN_VAR_H_ 35 #define _NETINET_IN_VAR_H_ 36 37 #ifndef _SYS_QUEUE_H_ 38 #include <sys/queue.h> 39 #endif 40 #ifndef _SYS_FNV_HASH_H_ 41 #include <sys/fnv_hash.h> 42 #endif 43 #ifndef _NET_IF_VAR_H_ 44 #include <net/if_var.h> 45 #endif 46 #ifndef _NETINET_IN_H_ 47 #include <netinet/in.h> 48 #endif 49 50 /* 51 * Interface address, Internet version. One of these structures 52 * is allocated for each Internet address on an interface. 53 * The ifaddr structure contains the protocol-independent part 54 * of the structure and is assumed to be first. 55 */ 56 struct in_ifaddr { 57 struct ifaddr ia_ifa; /* protocol-independent info */ 58 #define ia_ifp ia_ifa.ifa_ifp 59 #define ia_flags ia_ifa.ifa_flags 60 /* ia_{,sub}net{,mask} in host order */ 61 u_long ia_net; /* network number of interface */ 62 u_long ia_netmask; /* mask of net part */ 63 u_long ia_subnet; /* subnet number, including net */ 64 u_long ia_subnetmask; /* mask of subnet part */ 65 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 66 void *ia_pad1[2]; 67 void *ia_pad2[2]; 68 struct sockaddr_in ia_addr; /* reserve space for interface name */ 69 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 70 #define ia_broadaddr ia_dstaddr 71 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 72 }; 73 74 struct in_aliasreq { 75 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 76 struct sockaddr_in ifra_addr; 77 struct sockaddr_in ifra_broadaddr; 78 #define ifra_dstaddr ifra_broadaddr 79 struct sockaddr_in ifra_mask; 80 }; 81 /* 82 * Given a pointer to an in_ifaddr (ifaddr), 83 * return a pointer to the addr as a sockaddr_in. 84 */ 85 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 86 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 87 88 #define IN_LNAOF(in, ifa) \ 89 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 90 91 92 #ifdef _KERNEL 93 struct in_ifaddr_container; 94 95 extern struct in_addr zeroin_addr; 96 extern u_char inetctlerrmap[]; 97 98 /* 99 * Hash table for IP addresses. 100 */ 101 extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr_container) *in_ifaddrhashtbls[]; 102 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr_container) in_ifaddrheads[]; 103 extern u_long in_ifaddrhmask; /* mask for hash table */ 104 105 #define INADDR_NHASH_LOG2 9 106 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 107 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 108 #define INADDR_HASH(x) \ 109 (&in_ifaddrhashtbls[mycpuid][INADDR_HASHVAL(x) & in_ifaddrhmask]) 110 111 112 /* 113 * Function for finding the interface (ifnet structure) corresponding to one 114 * of our IP addresses. 115 */ 116 static __inline struct ifnet * 117 INADDR_TO_IFP(const struct in_addr *_addr) 118 { 119 struct in_ifaddr_container *_iac; 120 121 LIST_FOREACH(_iac, INADDR_HASH(_addr->s_addr), ia_hash) { 122 if (IA_SIN(_iac->ia)->sin_addr.s_addr == _addr->s_addr) 123 return _iac->ia->ia_ifp; 124 } 125 return NULL; 126 } 127 128 /* 129 * Function for finding the internet address structure (in_ifaddr) corresponding 130 * to a given interface (ifnet structure). 131 */ 132 static __inline struct in_ifaddr * 133 IFP_TO_IA(const struct ifnet *_ifp) 134 { 135 struct in_ifaddr_container *_iac; 136 137 TAILQ_FOREACH(_iac, &in_ifaddrheads[mycpuid], ia_link) 138 if (_iac->ia->ia_ifp == _ifp) 139 return _iac->ia; 140 return NULL; 141 } 142 143 #endif /* _KERNEL */ 144 145 /* 146 * This information should be part of the ifnet structure but we don't wish 147 * to change that - as it might break a number of things 148 */ 149 150 struct router_info { 151 struct ifnet *rti_ifp; 152 int rti_type; /* type of router which is querier on this interface */ 153 int rti_time; /* # of slow timeouts since last old query */ 154 struct router_info *rti_next; 155 }; 156 157 /* 158 * Internet multicast address structure. There is one of these for each IP 159 * multicast group to which this host belongs on a given network interface. 160 * For every entry on the interface's if_multiaddrs list which represents 161 * an IP multicast group, there is one of these structures. They are also 162 * kept on a system-wide list to make it easier to keep our legacy IGMP code 163 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below). 164 */ 165 struct in_multi { 166 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */ 167 struct in_addr inm_addr; /* IP multicast address, convenience */ 168 struct ifnet *inm_ifp; /* back pointer to ifnet */ 169 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 170 u_int inm_timer; /* IGMP membership report timer */ 171 u_int inm_state; /* state of the membership */ 172 struct router_info *inm_rti; /* router info*/ 173 }; 174 175 #ifdef _KERNEL 176 177 #ifdef SYSCTL_DECL 178 SYSCTL_DECL(_net_inet_ip); 179 SYSCTL_DECL(_net_inet_raw); 180 #endif 181 182 extern LIST_HEAD(in_multihead, in_multi) in_multihead; 183 184 /* 185 * Structure used by macros below to remember position when stepping through 186 * all of the in_multi records. 187 */ 188 struct in_multistep { 189 struct in_multi *i_inm; 190 }; 191 192 /* 193 * Look up the in_multi record for a given IP multicast address on a given 194 * interface. If no matching record is found, NULL is returned. 195 */ 196 static __inline struct in_multi * 197 IN_LOOKUP_MULTI(const struct in_addr *_addr, struct ifnet *_ifp) 198 { 199 const struct ifmultiaddr *_ifma; 200 struct in_multi *_inm = NULL; 201 202 if (_ifp == NULL) 203 return NULL; 204 205 /* TODO: need ifnet_serialize_main */ 206 ifnet_serialize_all(_ifp); 207 TAILQ_FOREACH(_ifma, &_ifp->if_multiaddrs, ifma_link) { 208 if (_ifma->ifma_addr->sa_family == AF_INET && 209 ((struct sockaddr_in *)_ifma->ifma_addr)->sin_addr.s_addr == 210 _addr->s_addr) { 211 _inm = _ifma->ifma_protospec; 212 break; 213 } 214 } 215 ifnet_deserialize_all(_ifp); 216 217 return _inm; 218 } 219 220 /* 221 * Macro to step through all of the in_multi records, one at a time. 222 * The current position is remembered in "step", which the caller must 223 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 224 * and get the first record. Both macros return a NULL "inm" when there 225 * are no remaining records. 226 */ 227 #define IN_NEXT_MULTI(step, inm) \ 228 /* struct in_multistep step; */ \ 229 /* struct in_multi *inm; */ \ 230 do { \ 231 if (((inm) = (step).i_inm) != NULL) \ 232 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \ 233 } while(0) 234 235 #define IN_FIRST_MULTI(step, inm) \ 236 /* struct in_multistep step; */ \ 237 /* struct in_multi *inm; */ \ 238 do { \ 239 (step).i_inm = LIST_FIRST(&in_multihead); \ 240 IN_NEXT_MULTI((step), (inm)); \ 241 } while(0) 242 243 struct route; 244 struct lwkt_serialize; 245 union netmsg; 246 247 void in_ifdetach(struct ifnet *ifp); 248 struct in_multi *in_addmulti (struct in_addr *, struct ifnet *); 249 void in_delmulti (struct in_multi *); 250 int in_control (u_long, caddr_t, struct ifnet *, struct thread *); 251 void in_control_dispatch(union netmsg *); 252 void in_rtqdrain (void); 253 void ip_input (struct mbuf *); 254 void ip_forward (struct mbuf *, boolean_t, struct sockaddr_in *); 255 int in_ifadown (struct ifaddr *ifa, int); 256 int in_ifadown_force (struct ifaddr *ifa, int); 257 void in_ifscrub (struct ifnet *, struct in_ifaddr *); 258 void in_iaunlink (struct in_ifaddr *); 259 void in_iahash_insert (struct in_ifaddr *); 260 void in_iahash_remove (struct in_ifaddr *); 261 262 #endif /* _KERNEL */ 263 264 /* INET6 stuff */ 265 #include <netinet6/in6_var.h> 266 267 #endif /* _NETINET_IN_VAR_H_ */ 268