The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_var.h

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    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: releng/5.2/sys/netinet/in_var.h 122702 2003-11-14 21:02:22Z andre $
   35  */
   36 
   37 #ifndef _NETINET_IN_VAR_H_
   38 #define _NETINET_IN_VAR_H_
   39 
   40 #include <sys/queue.h>
   41 #include <sys/fnv_hash.h>
   42 
   43 /*
   44  * Interface address, Internet version.  One of these structures
   45  * is allocated for each Internet address on an interface.
   46  * The ifaddr structure contains the protocol-independent part
   47  * of the structure and is assumed to be first.
   48  */
   49 struct in_ifaddr {
   50         struct  ifaddr ia_ifa;          /* protocol-independent info */
   51 #define ia_ifp          ia_ifa.ifa_ifp
   52 #define ia_flags        ia_ifa.ifa_flags
   53                                         /* ia_{,sub}net{,mask} in host order */
   54         u_long  ia_net;                 /* network number of interface */
   55         u_long  ia_netmask;             /* mask of net part */
   56         u_long  ia_subnet;              /* subnet number, including net */
   57         u_long  ia_subnetmask;          /* mask of subnet part */
   58         struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */
   59         LIST_ENTRY(in_ifaddr) ia_hash;  /* entry in bucket of inet addresses */
   60         TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
   61         struct  sockaddr_in ia_addr;    /* reserve space for interface name */
   62         struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
   63 #define ia_broadaddr    ia_dstaddr
   64         struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
   65 };
   66 
   67 struct  in_aliasreq {
   68         char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
   69         struct  sockaddr_in ifra_addr;
   70         struct  sockaddr_in ifra_broadaddr;
   71 #define ifra_dstaddr ifra_broadaddr
   72         struct  sockaddr_in ifra_mask;
   73 };
   74 /*
   75  * Given a pointer to an in_ifaddr (ifaddr),
   76  * return a pointer to the addr as a sockaddr_in.
   77  */
   78 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
   79 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
   80 
   81 #define IN_LNAOF(in, ifa) \
   82         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
   83 
   84 
   85 #ifdef  _KERNEL
   86 extern  struct  in_addr zeroin_addr;
   87 extern  u_char  inetctlerrmap[];
   88 
   89 /* 
   90  * Hash table for IP addresses.
   91  */
   92 extern  LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
   93 extern  TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
   94 extern  u_long in_ifaddrhmask;                  /* mask for hash table */
   95 
   96 #define INADDR_NHASH_LOG2       9
   97 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
   98 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
   99 #define INADDR_HASH(x) \
  100         (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask])
  101 
  102 
  103 /*
  104  * Macro for finding the interface (ifnet structure) corresponding to one
  105  * of our IP addresses.
  106  */
  107 #define INADDR_TO_IFP(addr, ifp) \
  108         /* struct in_addr addr; */ \
  109         /* struct ifnet *ifp; */ \
  110 { \
  111         struct in_ifaddr *ia; \
  112 \
  113         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  114                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  115                         break; \
  116         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  117 }
  118 
  119 /*
  120  * Macro for finding the internet address structure (in_ifaddr) corresponding
  121  * to a given interface (ifnet structure).
  122  */
  123 #define IFP_TO_IA(ifp, ia) \
  124         /* struct ifnet *ifp; */ \
  125         /* struct in_ifaddr *ia; */ \
  126 { \
  127         for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
  128             (ia) != NULL && (ia)->ia_ifp != (ifp); \
  129             (ia) = TAILQ_NEXT((ia), ia_link)) \
  130                 continue; \
  131 }
  132 #endif
  133 
  134 /*
  135  * This information should be part of the ifnet structure but we don't wish
  136  * to change that - as it might break a number of things
  137  */
  138 
  139 struct router_info {
  140         struct ifnet *rti_ifp;
  141         int    rti_type; /* type of router which is querier on this interface */
  142         int    rti_time; /* # of slow timeouts since last old query */
  143         SLIST_ENTRY(router_info) rti_list;
  144 };
  145 
  146 /*
  147  * Internet multicast address structure.  There is one of these for each IP
  148  * multicast group to which this host belongs on a given network interface.
  149  * For every entry on the interface's if_multiaddrs list which represents
  150  * an IP multicast group, there is one of these structures.  They are also
  151  * kept on a system-wide list to make it easier to keep our legacy IGMP code
  152  * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
  153  */
  154 struct in_multi {
  155         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
  156         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  157         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  158         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  159         u_int   inm_timer;              /* IGMP membership report timer */
  160         u_int   inm_state;              /*  state of the membership */
  161         struct  router_info *inm_rti;   /* router info*/
  162 };
  163 
  164 #ifdef _KERNEL
  165 
  166 #ifdef SYSCTL_DECL
  167 SYSCTL_DECL(_net_inet_ip);
  168 SYSCTL_DECL(_net_inet_raw);
  169 #endif
  170 
  171 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
  172 
  173 /*
  174  * Structure used by macros below to remember position when stepping through
  175  * all of the in_multi records.
  176  */
  177 struct in_multistep {
  178         struct in_multi *i_inm;
  179 };
  180 
  181 /*
  182  * Macro for looking up the in_multi record for a given IP multicast address
  183  * on a given interface.  If no matching record is found, "inm" is set null.
  184  */
  185 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
  186         /* struct in_addr addr; */ \
  187         /* struct ifnet *ifp; */ \
  188         /* struct in_multi *inm; */ \
  189 do { \
  190         struct ifmultiaddr *ifma; \
  191 \
  192         TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
  193                 if (ifma->ifma_addr->sa_family == AF_INET \
  194                     && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
  195                     (addr).s_addr) \
  196                         break; \
  197         } \
  198         (inm) = ifma ? ifma->ifma_protospec : 0; \
  199 } while(0)
  200 
  201 /*
  202  * Macro to step through all of the in_multi records, one at a time.
  203  * The current position is remembered in "step", which the caller must
  204  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
  205  * and get the first record.  Both macros return a NULL "inm" when there
  206  * are no remaining records.
  207  */
  208 #define IN_NEXT_MULTI(step, inm) \
  209         /* struct in_multistep  step; */ \
  210         /* struct in_multi *inm; */ \
  211 do { \
  212         if (((inm) = (step).i_inm) != NULL) \
  213                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
  214 } while(0)
  215 
  216 #define IN_FIRST_MULTI(step, inm) \
  217         /* struct in_multistep step; */ \
  218         /* struct in_multi *inm; */ \
  219 do { \
  220         (step).i_inm = LIST_FIRST(&in_multihead); \
  221         IN_NEXT_MULTI((step), (inm)); \
  222 } while(0)
  223 
  224 struct  route;
  225 struct  in_multi *in_addmulti(struct in_addr *, struct ifnet *);
  226 void    in_delmulti(struct in_multi *);
  227 int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,
  228             struct thread *);
  229 void    in_rtqdrain(void);
  230 void    ip_input(struct mbuf *);
  231 int     in_ifadown(struct ifaddr *ifa, int);
  232 void    in_ifscrub(struct ifnet *, struct in_ifaddr *);
  233 int     ip_fastforward(struct mbuf *);
  234 
  235 #endif /* _KERNEL */
  236 
  237 /* INET6 stuff */
  238 #include <netinet6/in6_var.h>
  239 
  240 #endif /* _NETINET_IN_VAR_H_ */

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