The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * $FreeBSD$
   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  * Macro for finding the internet address structure (in_ifaddr)
   99  * corresponding to one of our IP addresses (in_addr).
  100  */
  101 #define INADDR_TO_IFADDR(addr, ia) \
  102         /* struct in_addr addr; */ \
  103         /* struct in_ifaddr *ia; */ \
  104 do { \
  105 \
  106         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  107                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  108                         break; \
  109 } while (0)
  110 
  111 /*
  112  * Macro for finding the interface (ifnet structure) corresponding to one
  113  * of our IP addresses.
  114  */
  115 #define INADDR_TO_IFP(addr, ifp) \
  116         /* struct in_addr addr; */ \
  117         /* struct ifnet *ifp; */ \
  118 { \
  119         struct in_ifaddr *ia; \
  120 \
  121         INADDR_TO_IFADDR(addr, ia); \
  122         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  123 }
  124 
  125 /*
  126  * Macro for finding the internet address structure (in_ifaddr) corresponding
  127  * to a given interface (ifnet structure).
  128  */
  129 #define IFP_TO_IA(ifp, ia) \
  130         /* struct ifnet *ifp; */ \
  131         /* struct in_ifaddr *ia; */ \
  132 { \
  133         for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
  134             (ia) != NULL && (ia)->ia_ifp != (ifp); \
  135             (ia) = TAILQ_NEXT((ia), ia_link)) \
  136                 continue; \
  137 }
  138 #endif
  139 
  140 /*
  141  * This information should be part of the ifnet structure but we don't wish
  142  * to change that - as it might break a number of things
  143  */
  144 
  145 struct router_info {
  146         struct ifnet *rti_ifp;
  147         int    rti_type; /* type of router which is querier on this interface */
  148         int    rti_time; /* # of slow timeouts since last old query */
  149         SLIST_ENTRY(router_info) rti_list;
  150 #ifdef notyet
  151         int     rti_timev1;     /* IGMPv1 querier present */
  152         int     rti_timev2;     /* IGMPv2 querier present */
  153         int     rti_timer;      /* report to general query */
  154         int     rti_qrv;        /* querier robustness */
  155 #endif
  156 };
  157 
  158 /*
  159  * Internet multicast address structure.  There is one of these for each IP
  160  * multicast group to which this host belongs on a given network interface.
  161  * For every entry on the interface's if_multiaddrs list which represents
  162  * an IP multicast group, there is one of these structures.  They are also
  163  * kept on a system-wide list to make it easier to keep our legacy IGMP code
  164  * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
  165  */
  166 struct in_multi {
  167         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
  168         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  169         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  170         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  171         u_int   inm_timer;              /* IGMP membership report timer */
  172         u_int   inm_state;              /*  state of the membership */
  173         struct  router_info *inm_rti;   /* router info*/
  174         u_int   inm_refcount;           /* reference count */
  175 #ifdef notyet           /* IGMPv3 source-specific multicast fields */
  176         TAILQ_HEAD(, in_msfentry) inm_msf;      /* all active source filters */
  177         TAILQ_HEAD(, in_msfentry) inm_msf_record;       /* recorded sources */
  178         TAILQ_HEAD(, in_msfentry) inm_msf_exclude;      /* exclude sources */
  179         TAILQ_HEAD(, in_msfentry) inm_msf_include;      /* include sources */
  180         /* XXX: should this lot go to the router_info structure? */
  181         /* XXX: can/should these be callouts? */
  182         /* IGMP protocol timers */
  183         int32_t         inm_ti_curstate;        /* current state timer */
  184         int32_t         inm_ti_statechg;        /* state change timer */
  185         /* IGMP report timers */
  186         uint16_t        inm_rpt_statechg;       /* state change report timer */
  187         uint16_t        inm_rpt_toxx;           /* fmode change report timer */
  188         /* IGMP protocol state */
  189         uint16_t        inm_fmode;              /* filter mode */
  190         uint32_t        inm_recsrc_count;       /* # of recorded sources */
  191         uint16_t        inm_exclude_sock_count; /* # of exclude-mode sockets */
  192         uint16_t        inm_gass_count;         /* # of g-a-s queries */
  193 #endif
  194 };
  195 
  196 #ifdef notyet
  197 /*
  198  * Internet multicast source filter list. This list is used to store
  199  * IP multicast source addresses for each membership on an interface.
  200  * TODO: Allocate these structures using UMA.
  201  * TODO: Find an easier way of linking the struct into two lists at once.
  202  */
  203 struct in_msfentry {
  204         TAILQ_ENTRY(in_msfentry) isf_link;      /* next filter in all-list */
  205         TAILQ_ENTRY(in_msfentry) isf_next;      /* next filter in queue */
  206         struct in_addr  isf_addr;       /* the address of this source */
  207         uint16_t        isf_refcount;   /* reference count */
  208         uint16_t        isf_reporttag;  /* what to report to the IGMP router */
  209         uint16_t        isf_rexmit;     /* retransmission state/count */
  210 };
  211 #endif
  212 
  213 #ifdef _KERNEL
  214 
  215 #ifdef SYSCTL_DECL
  216 SYSCTL_DECL(_net_inet);
  217 SYSCTL_DECL(_net_inet_ip);
  218 SYSCTL_DECL(_net_inet_raw);
  219 #endif
  220 
  221 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
  222 
  223 /*
  224  * Lock macros for IPv4 layer multicast address lists.  IPv4 lock goes
  225  * before link layer multicast locks in the lock order.  In most cases,
  226  * consumers of IN_*_MULTI() macros should acquire the locks before
  227  * calling them; users of the in_{add,del}multi() functions should not.
  228  */
  229 extern struct mtx in_multi_mtx;
  230 #define IN_MULTI_LOCK()         mtx_lock(&in_multi_mtx)
  231 #define IN_MULTI_UNLOCK()       mtx_unlock(&in_multi_mtx)
  232 #define IN_MULTI_LOCK_ASSERT()  mtx_assert(&in_multi_mtx, MA_OWNED)
  233 
  234 /*
  235  * Structure used by macros below to remember position when stepping through
  236  * all of the in_multi records.
  237  */
  238 struct in_multistep {
  239         struct in_multi *i_inm;
  240 };
  241 
  242 /*
  243  * Macro for looking up the in_multi record for a given IP multicast address
  244  * on a given interface.  If no matching record is found, "inm" is set null.
  245  */
  246 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
  247         /* struct in_addr addr; */ \
  248         /* struct ifnet *ifp; */ \
  249         /* struct in_multi *inm; */ \
  250 do { \
  251         struct ifmultiaddr *ifma; \
  252 \
  253         IN_MULTI_LOCK_ASSERT(); \
  254         IF_ADDR_LOCK(ifp); \
  255         TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
  256                 if (ifma->ifma_addr->sa_family == AF_INET \
  257                     && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
  258                     (addr).s_addr) \
  259                         break; \
  260         } \
  261         (inm) = ifma ? ifma->ifma_protospec : 0; \
  262         IF_ADDR_UNLOCK(ifp); \
  263 } while(0)
  264 
  265 /*
  266  * Macro to step through all of the in_multi records, one at a time.
  267  * The current position is remembered in "step", which the caller must
  268  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
  269  * and get the first record.  Both macros return a NULL "inm" when there
  270  * are no remaining records.
  271  */
  272 #define IN_NEXT_MULTI(step, inm) \
  273         /* struct in_multistep  step; */ \
  274         /* struct in_multi *inm; */ \
  275 do { \
  276         IN_MULTI_LOCK_ASSERT(); \
  277         if (((inm) = (step).i_inm) != NULL) \
  278                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
  279 } while(0)
  280 
  281 #define IN_FIRST_MULTI(step, inm) \
  282         /* struct in_multistep step; */ \
  283         /* struct in_multi *inm; */ \
  284 do { \
  285         IN_MULTI_LOCK_ASSERT(); \
  286         (step).i_inm = LIST_FIRST(&in_multihead); \
  287         IN_NEXT_MULTI((step), (inm)); \
  288 } while(0)
  289 
  290 struct  route;
  291 struct  ip_moptions;
  292 
  293 size_t  imo_match_group(struct ip_moptions *, struct ifnet *,
  294             struct sockaddr *);
  295 struct  in_msource *imo_match_source(struct ip_moptions *, size_t,
  296             struct sockaddr *);
  297 struct  in_multi *in_addmulti(struct in_addr *, struct ifnet *);
  298 void    in_delmulti(struct in_multi *);
  299 void    in_delmulti_locked(struct in_multi *);
  300 int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,
  301             struct thread *);
  302 void    in_rtqdrain(void);
  303 void    ip_input(struct mbuf *);
  304 int     in_ifadown(struct ifaddr *ifa, int);
  305 void    in_ifscrub(struct ifnet *, struct in_ifaddr *);
  306 struct  mbuf    *ip_fastforward(struct mbuf *);
  307 
  308 #endif /* _KERNEL */
  309 
  310 /* INET6 stuff */
  311 #include <netinet6/in6_var.h>
  312 
  313 #endif /* _NETINET_IN_VAR_H_ */

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