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  * $FreeBSD$
   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  ifqueue ipintrq;                /* ip packet input queue */
   87 extern  struct  in_addr zeroin_addr;
   88 extern  u_char  inetctlerrmap[];
   89 
   90 /* 
   91  * Hash table for IP addresses.
   92  */
   93 extern  LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
   94 extern  TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
   95 extern  u_long in_ifaddrhmask;                  /* mask for hash table */
   96 
   97 #define INADDR_NHASH_LOG2       9
   98 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
   99 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
  100 #define INADDR_HASH(x) \
  101         (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask])
  102 
  103 
  104 /*
  105  * Macro for finding the interface (ifnet structure) corresponding to one
  106  * of our IP addresses.
  107  */
  108 #define INADDR_TO_IFP(addr, ifp) \
  109         /* struct in_addr addr; */ \
  110         /* struct ifnet *ifp; */ \
  111 { \
  112         struct in_ifaddr *ia; \
  113 \
  114         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  115                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  116                         break; \
  117         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  118 }
  119 
  120 /*
  121  * Macro for finding the internet address structure (in_ifaddr) corresponding
  122  * to a given interface (ifnet structure).
  123  */
  124 #define IFP_TO_IA(ifp, ia) \
  125         /* struct ifnet *ifp; */ \
  126         /* struct in_ifaddr *ia; */ \
  127 { \
  128         for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
  129             (ia) != NULL && (ia)->ia_ifp != (ifp); \
  130             (ia) = TAILQ_NEXT((ia), ia_link)) \
  131                 continue; \
  132 }
  133 #endif
  134 
  135 /*
  136  * This information should be part of the ifnet structure but we don't wish
  137  * to change that - as it might break a number of things
  138  */
  139 
  140 struct router_info {
  141         struct ifnet *rti_ifp;
  142         int    rti_type; /* type of router which is querier on this interface */
  143         int    rti_time; /* # of slow timeouts since last old query */
  144         struct router_info *rti_next;
  145 };
  146 
  147 /*
  148  * Internet multicast address structure.  There is one of these for each IP
  149  * multicast group to which this host belongs on a given network interface.
  150  * For every entry on the interface's if_multiaddrs list which represents
  151  * an IP multicast group, there is one of these structures.  They are also
  152  * kept on a system-wide list to make it easier to keep our legacy IGMP code
  153  * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
  154  */
  155 struct in_multi {
  156         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
  157         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  158         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  159         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  160         u_int   inm_timer;              /* IGMP membership report timer */
  161         u_int   inm_state;              /*  state of the membership */
  162         struct  router_info *inm_rti;   /* router info*/
  163 };
  164 
  165 #ifdef _KERNEL
  166 
  167 #ifdef SYSCTL_DECL
  168 SYSCTL_DECL(_net_inet_ip);
  169 SYSCTL_DECL(_net_inet_raw);
  170 #endif
  171 
  172 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
  173 
  174 /*
  175  * Structure used by macros below to remember position when stepping through
  176  * all of the in_multi records.
  177  */
  178 struct in_multistep {
  179         struct in_multi *i_inm;
  180 };
  181 
  182 /*
  183  * Macro for looking up the in_multi record for a given IP multicast address
  184  * on a given interface.  If no matching record is found, "inm" is set null.
  185  */
  186 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
  187         /* struct in_addr addr; */ \
  188         /* struct ifnet *ifp; */ \
  189         /* struct in_multi *inm; */ \
  190 do { \
  191         struct ifmultiaddr *ifma; \
  192 \
  193         LIST_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
  194                 if (ifma->ifma_addr->sa_family == AF_INET \
  195                     && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
  196                     (addr).s_addr) \
  197                         break; \
  198         } \
  199         (inm) = ifma ? ifma->ifma_protospec : 0; \
  200 } while(0)
  201 
  202 /*
  203  * Macro to step through all of the in_multi records, one at a time.
  204  * The current position is remembered in "step", which the caller must
  205  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
  206  * and get the first record.  Both macros return a NULL "inm" when there
  207  * are no remaining records.
  208  */
  209 #define IN_NEXT_MULTI(step, inm) \
  210         /* struct in_multistep  step; */ \
  211         /* struct in_multi *inm; */ \
  212 do { \
  213         if (((inm) = (step).i_inm) != NULL) \
  214                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
  215 } while(0)
  216 
  217 #define IN_FIRST_MULTI(step, inm) \
  218         /* struct in_multistep step; */ \
  219         /* struct in_multi *inm; */ \
  220 do { \
  221         (step).i_inm = LIST_FIRST(&in_multihead); \
  222         IN_NEXT_MULTI((step), (inm)); \
  223 } while(0)
  224 
  225 struct  route;
  226 struct  in_multi *in_addmulti __P((struct in_addr *, struct ifnet *));
  227 void    in_delmulti __P((struct in_multi *));
  228 int     in_control __P((struct socket *, u_long, caddr_t, struct ifnet *,
  229                         struct proc *));
  230 void    in_rtqdrain __P((void));
  231 void    ip_input __P((struct mbuf *));
  232 int     in_ifadown __P((struct ifaddr *ifa, int));
  233 void    in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
  234 int     ipflow_fastforward __P((struct mbuf *));
  235 void    ipflow_create __P((const struct route *, struct mbuf *));
  236 void    ipflow_slowtimo __P((void));
  237 
  238 #endif /* _KERNEL */
  239 
  240 /* INET6 stuff */
  241 #include <netinet6/in6_var.h>
  242 
  243 #endif /* _NETINET_IN_VAR_H_ */

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