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: src/sys/netinet/in_var.h,v 1.33.2.3 2001/12/14 20:09:34 jlemon Exp $ 35 * $DragonFly: src/sys/netinet/in_var.h,v 1.16 2008/10/26 07:11:28 sephe Exp $ 36 */ 37 38 #ifndef _NETINET_IN_VAR_H_ 39 #define _NETINET_IN_VAR_H_ 40 41 #ifndef _SYS_QUEUE_H_ 42 #include <sys/queue.h> 43 #endif 44 #ifndef _SYS_FNV_HASH_H_ 45 #include <sys/fnv_hash.h> 46 #endif 47 #ifndef _NET_IF_VAR_H_ 48 #include <net/if_var.h> 49 #endif 50 #ifndef _NETINET_IN_H_ 51 #include <netinet/in.h> 52 #endif 53 54 /* 55 * Interface address, Internet version. One of these structures 56 * is allocated for each Internet address on an interface. 57 * The ifaddr structure contains the protocol-independent part 58 * of the structure and is assumed to be first. 59 */ 60 struct in_ifaddr { 61 struct ifaddr ia_ifa; /* protocol-independent info */ 62 #define ia_ifp ia_ifa.ifa_ifp 63 #define ia_flags ia_ifa.ifa_flags 64 /* ia_{,sub}net{,mask} in host order */ 65 u_long ia_net; /* network number of interface */ 66 u_long ia_netmask; /* mask of net part */ 67 u_long ia_subnet; /* subnet number, including net */ 68 u_long ia_subnetmask; /* mask of subnet part */ 69 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 70 void *ia_pad1[2]; 71 void *ia_pad2[2]; 72 struct sockaddr_in ia_addr; /* reserve space for interface name */ 73 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 74 #define ia_broadaddr ia_dstaddr 75 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 76 }; 77 78 struct in_aliasreq { 79 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 80 struct sockaddr_in ifra_addr; 81 struct sockaddr_in ifra_broadaddr; 82 #define ifra_dstaddr ifra_broadaddr 83 struct sockaddr_in ifra_mask; 84 }; 85 /* 86 * Given a pointer to an in_ifaddr (ifaddr), 87 * return a pointer to the addr as a sockaddr_in. 88 */ 89 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 90 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 91 92 #define IN_LNAOF(in, ifa) \ 93 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 94 95 96 #ifdef _KERNEL 97 struct in_ifaddr_container; 98 99 #define IA_PRF_RTEXISTOK IFA_PRF_FLAG0 /* don't fail even if rtentry 100 * already exist */ 101 102 extern struct in_addr zeroin_addr; 103 extern u_char inetctlerrmap[]; 104 105 /* 106 * Hash table for IP addresses. 107 */ 108 extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr_container) *in_ifaddrhashtbls[]; 109 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr_container) in_ifaddrheads[]; 110 extern u_long in_ifaddrhmask; /* mask for hash table */ 111 112 #define INADDR_NHASH_LOG2 9 113 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 114 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 115 #define INADDR_HASH(x) \ 116 (&in_ifaddrhashtbls[mycpuid][INADDR_HASHVAL(x) & in_ifaddrhmask]) 117 118 119 /* 120 * Function for finding the interface (ifnet structure) corresponding to one 121 * of our IP addresses. 122 */ 123 static __inline struct ifnet * 124 INADDR_TO_IFP(const struct in_addr *_addr) 125 { 126 struct in_ifaddr_container *_iac; 127 128 LIST_FOREACH(_iac, INADDR_HASH(_addr->s_addr), ia_hash) { 129 if (IA_SIN(_iac->ia)->sin_addr.s_addr == _addr->s_addr) 130 return _iac->ia->ia_ifp; 131 } 132 return NULL; 133 } 134 135 /* 136 * Function for finding the internet address structure (in_ifaddr) corresponding 137 * to a given interface (ifnet structure). 138 */ 139 static __inline struct in_ifaddr * 140 IFP_TO_IA(const struct ifnet *_ifp) 141 { 142 struct in_ifaddr_container *_iac; 143 144 TAILQ_FOREACH(_iac, &in_ifaddrheads[mycpuid], ia_link) 145 if (_iac->ia->ia_ifp == _ifp) 146 return _iac->ia; 147 return NULL; 148 } 149 150 #endif /* _KERNEL */ 151 152 /* 153 * This information should be part of the ifnet structure but we don't wish 154 * to change that - as it might break a number of things 155 */ 156 157 struct router_info { 158 struct ifnet *rti_ifp; 159 int rti_type; /* type of router which is querier on this interface */ 160 int rti_time; /* # of slow timeouts since last old query */ 161 struct router_info *rti_next; 162 }; 163 164 /* 165 * Internet multicast address structure. There is one of these for each IP 166 * multicast group to which this host belongs on a given network interface. 167 * For every entry on the interface's if_multiaddrs list which represents 168 * an IP multicast group, there is one of these structures. They are also 169 * kept on a system-wide list to make it easier to keep our legacy IGMP code 170 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below). 171 */ 172 struct in_multi { 173 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */ 174 struct in_addr inm_addr; /* IP multicast address, convenience */ 175 struct ifnet *inm_ifp; /* back pointer to ifnet */ 176 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 177 u_int inm_timer; /* IGMP membership report timer */ 178 u_int inm_state; /* state of the membership */ 179 struct router_info *inm_rti; /* router info*/ 180 }; 181 182 #ifdef _KERNEL 183 184 #ifdef SYSCTL_DECL 185 SYSCTL_DECL(_net_inet_ip); 186 SYSCTL_DECL(_net_inet_raw); 187 #endif 188 189 extern LIST_HEAD(in_multihead, in_multi) in_multihead; 190 191 /* 192 * Structure used by macros below to remember position when stepping through 193 * all of the in_multi records. 194 */ 195 struct in_multistep { 196 struct in_multi *i_inm; 197 }; 198 199 /* 200 * Macro for looking up the in_multi record for a given IP multicast address 201 * on a given interface. If no matching record is found, "inm" is set null. 202 */ 203 #define IN_LOOKUP_MULTI(addr, ifp, inm) \ 204 /* struct in_addr addr; */ \ 205 /* struct ifnet *ifp; */ \ 206 /* struct in_multi *inm; */ \ 207 do { \ 208 struct ifmultiaddr *ifma; \ 209 \ 210 LIST_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \ 211 if (ifma->ifma_addr->sa_family == AF_INET \ 212 && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \ 213 (addr).s_addr) \ 214 break; \ 215 } \ 216 (inm) = ifma ? ifma->ifma_protospec : 0; \ 217 } while(0) 218 219 /* 220 * Macro to step through all of the in_multi records, one at a time. 221 * The current position is remembered in "step", which the caller must 222 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step" 223 * and get the first record. Both macros return a NULL "inm" when there 224 * are no remaining records. 225 */ 226 #define IN_NEXT_MULTI(step, inm) \ 227 /* struct in_multistep step; */ \ 228 /* struct in_multi *inm; */ \ 229 do { \ 230 if (((inm) = (step).i_inm) != NULL) \ 231 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \ 232 } while(0) 233 234 #define IN_FIRST_MULTI(step, inm) \ 235 /* struct in_multistep step; */ \ 236 /* struct in_multi *inm; */ \ 237 do { \ 238 (step).i_inm = LIST_FIRST(&in_multihead); \ 239 IN_NEXT_MULTI((step), (inm)); \ 240 } while(0) 241 242 struct route; 243 struct netmsg; 244 struct lwkt_serialize; 245 246 void in_ifdetach(struct ifnet *ifp); 247 struct in_multi *in_addmulti (struct in_addr *, struct ifnet *); 248 void in_delmulti (struct in_multi *); 249 int in_control (struct socket *, u_long, caddr_t, struct ifnet *, 250 struct thread *); 251 void in_rtqdrain (void); 252 void ip_input (struct mbuf *); 253 void ip_forward (struct mbuf *, boolean_t, struct sockaddr_in *); 254 int in_ifadown (struct ifaddr *ifa, int); 255 void in_ifscrub (struct ifnet *, struct in_ifaddr *); 256 void in_iaunlink (struct in_ifaddr *); 257 void in_iahash_insert (struct in_ifaddr *); 258 void in_iahash_remove (struct in_ifaddr *); 259 260 #endif /* _KERNEL */ 261 262 /* INET6 stuff */ 263 #include <netinet6/in6_var.h> 264 265 #endif /* _NETINET_IN_VAR_H_ */ 266