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. 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 1.14 2008/07/03 08:22:36 corecode 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 extern  struct  in_addr zeroin_addr;
 100 extern  u_char  inetctlerrmap[];
 101
 102 /*
 103  * Hash table for IP addresses.
 104  */
 105 extern  LIST_HEAD(in_ifaddrhashhead, in_ifaddr_container) *in_ifaddrhashtbls[];
 106 extern  TAILQ_HEAD(in_ifaddrhead, in_ifaddr_container) in_ifaddrheads[];
 107 extern  u_long in_ifaddrhmask;                  /* mask for hash table */
 108
 109 #define INADDR_NHASH_LOG2       9
 110 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
 111 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
 112 #define INADDR_HASH(x) \
 113         (&in_ifaddrhashtbls[mycpuid][INADDR_HASHVAL(x) & in_ifaddrhmask])
 114
 115
 116 /*
 117  * Function for finding the interface (ifnet structure) corresponding to one
 118  * of our IP addresses.
 119  */
 120 static __inline struct ifnet *
 121 INADDR_TO_IFP(const struct in_addr *_addr)
 122 {
 123         struct in_ifaddr_container *_iac;
 124
 125         LIST_FOREACH(_iac, INADDR_HASH(_addr->s_addr), ia_hash) {
 126                 if (IA_SIN(_iac->ia)->sin_addr.s_addr == _addr->s_addr)
 127                         return _iac->ia->ia_ifp;
 128         }
 129         return NULL;
 130 }
 131
 132 /*
 133  * Function for finding the internet address structure (in_ifaddr) corresponding
 134  * to a given interface (ifnet structure).
 135  */
 136 static __inline struct in_ifaddr *
 137 IFP_TO_IA(const struct ifnet *_ifp)
 138 {
 139         struct in_ifaddr_container *_iac;
 140
 141         TAILQ_FOREACH(_iac, &in_ifaddrheads[mycpuid], ia_link)
 142                 if (_iac->ia->ia_ifp == _ifp)
 143                         return _iac->ia;
 144         return NULL;
 145 }
 146
 147 #endif  /* _KERNEL */
 148
 149 /*
 150  * This information should be part of the ifnet structure but we don't wish
 151  * to change that - as it might break a number of things
 152  */
 153
 154 struct router_info {
 155         struct ifnet *rti_ifp;
 156         int    rti_type; /* type of router which is querier on this interface */
 157         int    rti_time; /* # of slow timeouts since last old query */
 158         struct router_info *rti_next;
 159 };
 160
 161 /*
 162  * Internet multicast address structure.  There is one of these for each IP
 163  * multicast group to which this host belongs on a given network interface.
 164  * For every entry on the interface's if_multiaddrs list which represents
 165  * an IP multicast group, there is one of these structures.  They are also
 166  * kept on a system-wide list to make it easier to keep our legacy IGMP code
 167  * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
 168  */
 169 struct in_multi {
 170         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 171         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 172         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 173         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 174         u_int   inm_timer;              /* IGMP membership report timer */
 175         u_int   inm_state;              /*  state of the membership */
 176         struct  router_info *inm_rti;   /* router info*/
 177 };
 178
 179 #ifdef _KERNEL
 180
 181 #ifdef SYSCTL_DECL
 182 SYSCTL_DECL(_net_inet_ip);
 183 SYSCTL_DECL(_net_inet_raw);
 184 #endif
 185
 186 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 187
 188 /*
 189  * Structure used by macros below to remember position when stepping through
 190  * all of the in_multi records.
 191  */
 192 struct in_multistep {
 193         struct in_multi *i_inm;
 194 };
 195
 196 /*
 197  * Macro for looking up the in_multi record for a given IP multicast address
 198  * on a given interface.  If no matching record is found, "inm" is set null.
 199  */
 200 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
 201         /* struct in_addr addr; */ \
 202         /* struct ifnet *ifp; */ \
 203         /* struct in_multi *inm; */ \
 204 do { \
 205         struct ifmultiaddr *ifma; \
 206 \
 207         LIST_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                         break; \
 212         } \
 213         (inm) = ifma ? ifma->ifma_protospec : 0; \
 214 } while(0)
 215
 216 /*
 217  * Macro to step through all of the in_multi records, one at a time.
 218  * The current position is remembered in "step", which the caller must
 219  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 220  * and get the first record.  Both macros return a NULL "inm" when there
 221  * are no remaining records.
 222  */
 223 #define IN_NEXT_MULTI(step, inm) \
 224         /* struct in_multistep  step; */ \
 225         /* struct in_multi *inm; */ \
 226 do { \
 227         if (((inm) = (step).i_inm) != NULL) \
 228                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
 229 } while(0)
 230
 231 #define IN_FIRST_MULTI(step, inm) \
 232         /* struct in_multistep step; */ \
 233         /* struct in_multi *inm; */ \
 234 do { \
 235         (step).i_inm = LIST_FIRST(&in_multihead); \
 236         IN_NEXT_MULTI((step), (inm)); \
 237 } while(0)
 238
 239 struct  route;
 240 struct  netmsg;
 241 struct  lwkt_serialize;
 242
 243 void    in_ifdetach(struct ifnet *ifp);
 244 struct  in_multi *in_addmulti (struct in_addr *, struct ifnet *);
 245 void    in_delmulti (struct in_multi *);
 246 int     in_control (struct socket *, u_long, caddr_t, struct ifnet *,
 247                         struct thread *);
 248 void    in_rtqdrain (void);
 249 void    ip_input (struct mbuf *);
 250 void    ip_forward (struct mbuf *, boolean_t, struct sockaddr_in *);
 251 int     in_ifadown (struct ifaddr *ifa, int);
 252 void    in_ifscrub (struct ifnet *, struct in_ifaddr *);
 253 void    in_iaunlink (struct in_ifaddr *);
 254 void    in_iahash_insert (struct in_ifaddr *);
 255 void    in_iahash_remove (struct in_ifaddr *);
 256 int     ipflow_fastforward (struct mbuf *, struct lwkt_serialize *);
 257 void    ipflow_create (const struct route *, struct mbuf *);
 258 void    ipflow_slowtimo (void);
 259
 260 #endif /* _KERNEL */
 261
 262 /* INET6 stuff */
 263 #include <netinet6/in6_var.h>
 264
 265 #endif /* _NETINET_IN_VAR_H_ */