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  * 4. 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: releng/6.1/sys/netinet/in_var.h 149427 2005-08-24 17:30:44Z rwatson $
   31  */
   32 
   33 #ifndef _NETINET_IN_VAR_H_
   34 #define _NETINET_IN_VAR_H_
   35 
   36 #include <sys/queue.h>
   37 #include <sys/fnv_hash.h>
   38 
   39 /*
   40  * Interface address, Internet version.  One of these structures
   41  * is allocated for each Internet address on an interface.
   42  * The ifaddr structure contains the protocol-independent part
   43  * of the structure and is assumed to be first.
   44  */
   45 struct in_ifaddr {
   46         struct  ifaddr ia_ifa;          /* protocol-independent info */
   47 #define ia_ifp          ia_ifa.ifa_ifp
   48 #define ia_flags        ia_ifa.ifa_flags
   49                                         /* ia_{,sub}net{,mask} in host order */
   50         u_long  ia_net;                 /* network number of interface */
   51         u_long  ia_netmask;             /* mask of net part */
   52         u_long  ia_subnet;              /* subnet number, including net */
   53         u_long  ia_subnetmask;          /* mask of subnet part */
   54         struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */
   55         LIST_ENTRY(in_ifaddr) ia_hash;  /* entry in bucket of inet addresses */
   56         TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
   57         struct  sockaddr_in ia_addr;    /* reserve space for interface name */
   58         struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
   59 #define ia_broadaddr    ia_dstaddr
   60         struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
   61 };
   62 
   63 struct  in_aliasreq {
   64         char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
   65         struct  sockaddr_in ifra_addr;
   66         struct  sockaddr_in ifra_broadaddr;
   67 #define ifra_dstaddr ifra_broadaddr
   68         struct  sockaddr_in ifra_mask;
   69 };
   70 /*
   71  * Given a pointer to an in_ifaddr (ifaddr),
   72  * return a pointer to the addr as a sockaddr_in.
   73  */
   74 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
   75 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
   76 
   77 #define IN_LNAOF(in, ifa) \
   78         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
   79 
   80 
   81 #ifdef  _KERNEL
   82 extern  u_char  inetctlerrmap[];
   83 
   84 /*
   85  * Hash table for IP addresses.
   86  */
   87 extern  LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
   88 extern  TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
   89 extern  u_long in_ifaddrhmask;                  /* mask for hash table */
   90 
   91 #define INADDR_NHASH_LOG2       9
   92 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
   93 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
   94 #define INADDR_HASH(x) \
   95         (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask])
   96 
   97 
   98 /*
   99  * Macro for finding the interface (ifnet structure) corresponding to one
  100  * of our IP addresses.
  101  */
  102 #define INADDR_TO_IFP(addr, ifp) \
  103         /* struct in_addr addr; */ \
  104         /* struct ifnet *ifp; */ \
  105 { \
  106         struct in_ifaddr *ia; \
  107 \
  108         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  109                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  110                         break; \
  111         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  112 }
  113 
  114 /*
  115  * Macro for finding the internet address structure (in_ifaddr) corresponding
  116  * to a given interface (ifnet structure).
  117  */
  118 #define IFP_TO_IA(ifp, ia) \
  119         /* struct ifnet *ifp; */ \
  120         /* struct in_ifaddr *ia; */ \
  121 { \
  122         for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
  123             (ia) != NULL && (ia)->ia_ifp != (ifp); \
  124             (ia) = TAILQ_NEXT((ia), ia_link)) \
  125                 continue; \
  126 }
  127 #endif
  128 
  129 /*
  130  * This information should be part of the ifnet structure but we don't wish
  131  * to change that - as it might break a number of things
  132  */
  133 
  134 struct router_info {
  135         struct ifnet *rti_ifp;
  136         int    rti_type; /* type of router which is querier on this interface */
  137         int    rti_time; /* # of slow timeouts since last old query */
  138         SLIST_ENTRY(router_info) rti_list;
  139 };
  140 
  141 /*
  142  * Internet multicast address structure.  There is one of these for each IP
  143  * multicast group to which this host belongs on a given network interface.
  144  * For every entry on the interface's if_multiaddrs list which represents
  145  * an IP multicast group, there is one of these structures.  They are also
  146  * kept on a system-wide list to make it easier to keep our legacy IGMP code
  147  * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
  148  */
  149 struct in_multi {
  150         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
  151         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  152         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  153         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  154         u_int   inm_timer;              /* IGMP membership report timer */
  155         u_int   inm_state;              /*  state of the membership */
  156         struct  router_info *inm_rti;   /* router info*/
  157 };
  158 
  159 #ifdef _KERNEL
  160 
  161 #ifdef SYSCTL_DECL
  162 SYSCTL_DECL(_net_inet);
  163 SYSCTL_DECL(_net_inet_ip);
  164 SYSCTL_DECL(_net_inet_raw);
  165 #endif
  166 
  167 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
  168 
  169 /*
  170  * Lock macros for IPv4 layer multicast address lists.  IPv4 lock goes
  171  * before link layer multicast locks in the lock order.  In most cases,
  172  * consumers of IN_*_MULTI() macros should acquire the locks before
  173  * calling them; users of the in_{add,del}multi() functions should not.
  174  */
  175 extern struct mtx in_multi_mtx;
  176 #define IN_MULTI_LOCK()         mtx_lock(&in_multi_mtx)
  177 #define IN_MULTI_UNLOCK()       mtx_unlock(&in_multi_mtx)
  178 #define IN_MULTI_LOCK_ASSERT()  mtx_assert(&in_multi_mtx, MA_OWNED)
  179 
  180 /*
  181  * Structure used by macros below to remember position when stepping through
  182  * all of the in_multi records.
  183  */
  184 struct in_multistep {
  185         struct in_multi *i_inm;
  186 };
  187 
  188 /*
  189  * Macro for looking up the in_multi record for a given IP multicast address
  190  * on a given interface.  If no matching record is found, "inm" is set null.
  191  */
  192 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
  193         /* struct in_addr addr; */ \
  194         /* struct ifnet *ifp; */ \
  195         /* struct in_multi *inm; */ \
  196 do { \
  197         struct ifmultiaddr *ifma; \
  198 \
  199         IN_MULTI_LOCK_ASSERT(); \
  200         IF_ADDR_LOCK(ifp); \
  201         TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
  202                 if (ifma->ifma_addr->sa_family == AF_INET \
  203                     && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
  204                     (addr).s_addr) \
  205                         break; \
  206         } \
  207         (inm) = ifma ? ifma->ifma_protospec : 0; \
  208         IF_ADDR_UNLOCK(ifp); \
  209 } while(0)
  210 
  211 /*
  212  * Macro to step through all of the in_multi records, one at a time.
  213  * The current position is remembered in "step", which the caller must
  214  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
  215  * and get the first record.  Both macros return a NULL "inm" when there
  216  * are no remaining records.
  217  */
  218 #define IN_NEXT_MULTI(step, inm) \
  219         /* struct in_multistep  step; */ \
  220         /* struct in_multi *inm; */ \
  221 do { \
  222         IN_MULTI_LOCK_ASSERT(); \
  223         if (((inm) = (step).i_inm) != NULL) \
  224                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
  225 } while(0)
  226 
  227 #define IN_FIRST_MULTI(step, inm) \
  228         /* struct in_multistep step; */ \
  229         /* struct in_multi *inm; */ \
  230 do { \
  231         IN_MULTI_LOCK_ASSERT(); \
  232         (step).i_inm = LIST_FIRST(&in_multihead); \
  233         IN_NEXT_MULTI((step), (inm)); \
  234 } while(0)
  235 
  236 struct  route;
  237 struct  in_multi *in_addmulti(struct in_addr *, struct ifnet *);
  238 void    in_delmulti(struct in_multi *);
  239 int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,
  240             struct thread *);
  241 void    in_rtqdrain(void);
  242 void    ip_input(struct mbuf *);
  243 int     in_ifadown(struct ifaddr *ifa, int);
  244 void    in_ifscrub(struct ifnet *, struct in_ifaddr *);
  245 int     ip_fastforward(struct mbuf *);
  246 
  247 #endif /* _KERNEL */
  248 
  249 /* INET6 stuff */
  250 #include <netinet6/in6_var.h>
  251 
  252 #endif /* _NETINET_IN_VAR_H_ */

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