sys/netinet/in_var.h

   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_ */