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/callout.h>
   37 #include <sys/queue.h>
   38 #include <sys/fnv_hash.h>
   39 #include <sys/tree.h>
   40 
   41 struct igmp_ifinfo;
   42 struct in_multi;
   43 struct lltable;
   44 
   45 /*
   46  * IPv4 per-interface state.
   47  */
   48 struct in_ifinfo {
   49         struct lltable          *ii_llt;        /* ARP state */
   50         struct igmp_ifinfo      *ii_igmp;       /* IGMP state */
   51         struct in_multi         *ii_allhosts;   /* 224.0.0.1 membership */
   52 };
   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_subnet{,mask} in host order */
   65         u_long  ia_subnet;              /* subnet address */
   66         u_long  ia_subnetmask;          /* mask of subnet */
   67         LIST_ENTRY(in_ifaddr) ia_hash;  /* entry in bucket of inet addresses */
   68         TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
   69         struct  sockaddr_in ia_addr;    /* reserve space for interface name */
   70         struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
   71 #define ia_broadaddr    ia_dstaddr
   72         struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
   73         struct  callout ia_garp_timer;  /* timer for retransmitting GARPs */
   74         int     ia_garp_count;          /* count of retransmitted GARPs */
   75 };
   76 
   77 struct  in_aliasreq {
   78         char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
   79         struct  sockaddr_in ifra_addr;
   80         struct  sockaddr_in ifra_broadaddr;
   81 #define ifra_dstaddr ifra_broadaddr
   82         struct  sockaddr_in ifra_mask;
   83         int     ifra_vhid;
   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 #define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask))
   92 
   93 #define IN_LNAOF(in, ifa) \
   94         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
   95 
   96 
   97 #ifdef  _KERNEL
   98 extern  u_char  inetctlerrmap[];
   99 
  100 #define LLTABLE(ifp)    \
  101         ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
  102 /*
  103  * Hash table for IP addresses.
  104  */
  105 TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
  106 LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
  107 
  108 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
  109 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
  110 VNET_DECLARE(u_long, in_ifaddrhmask);           /* mask for hash table */
  111 
  112 #define V_in_ifaddrhashtbl      VNET(in_ifaddrhashtbl)
  113 #define V_in_ifaddrhead         VNET(in_ifaddrhead)
  114 #define V_in_ifaddrhmask        VNET(in_ifaddrhmask)
  115 
  116 #define INADDR_NHASH_LOG2       9
  117 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
  118 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
  119 #define INADDR_HASH(x) \
  120         (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
  121 
  122 extern  struct rwlock in_ifaddr_lock;
  123 
  124 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED)
  125 #define IN_IFADDR_RLOCK()       rw_rlock(&in_ifaddr_lock)
  126 #define IN_IFADDR_RLOCK_ASSERT()        rw_assert(&in_ifaddr_lock, RA_RLOCKED)
  127 #define IN_IFADDR_RUNLOCK()     rw_runlock(&in_ifaddr_lock)
  128 #define IN_IFADDR_WLOCK()       rw_wlock(&in_ifaddr_lock)
  129 #define IN_IFADDR_WLOCK_ASSERT()        rw_assert(&in_ifaddr_lock, RA_WLOCKED)
  130 #define IN_IFADDR_WUNLOCK()     rw_wunlock(&in_ifaddr_lock)
  131 
  132 /*
  133  * Macro for finding the internet address structure (in_ifaddr)
  134  * corresponding to one of our IP addresses (in_addr).
  135  */
  136 #define INADDR_TO_IFADDR(addr, ia) \
  137         /* struct in_addr addr; */ \
  138         /* struct in_ifaddr *ia; */ \
  139 do { \
  140 \
  141         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  142                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  143                         break; \
  144 } while (0)
  145 
  146 /*
  147  * Macro for finding the interface (ifnet structure) corresponding to one
  148  * of our IP addresses.
  149  */
  150 #define INADDR_TO_IFP(addr, ifp) \
  151         /* struct in_addr addr; */ \
  152         /* struct ifnet *ifp; */ \
  153 { \
  154         struct in_ifaddr *ia; \
  155 \
  156         INADDR_TO_IFADDR(addr, ia); \
  157         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  158 }
  159 
  160 /*
  161  * Macro for finding the internet address structure (in_ifaddr) corresponding
  162  * to a given interface (ifnet structure).
  163  */
  164 #define IFP_TO_IA(ifp, ia)                                              \
  165         /* struct ifnet *ifp; */                                        \
  166         /* struct in_ifaddr *ia; */                                     \
  167 do {                                                                    \
  168         IN_IFADDR_RLOCK();                                              \
  169         for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead);                      \
  170             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
  171             (ia) = TAILQ_NEXT((ia), ia_link))                           \
  172                 continue;                                               \
  173         if ((ia) != NULL)                                               \
  174                 ifa_ref(&(ia)->ia_ifa);                                 \
  175         IN_IFADDR_RUNLOCK();                                            \
  176 } while (0)
  177 #endif
  178 
  179 /*
  180  * IP datagram reassembly.
  181  */
  182 #define IPREASS_NHASH_LOG2      6
  183 #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
  184 #define IPREASS_HMASK           (IPREASS_NHASH - 1)
  185 #define IPREASS_HASH(x,y) \
  186         (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
  187 
  188 /*
  189  * Legacy IPv4 IGMP per-link structure.
  190  */
  191 struct router_info {
  192         struct ifnet *rti_ifp;
  193         int    rti_type; /* type of router which is querier on this interface */
  194         int    rti_time; /* # of slow timeouts since last old query */
  195         SLIST_ENTRY(router_info) rti_list;
  196 };
  197 
  198 /*
  199  * Per-interface IGMP router version information.
  200  */
  201 struct igmp_ifinfo {
  202         LIST_ENTRY(igmp_ifinfo) igi_link;
  203         struct ifnet *igi_ifp;  /* interface this instance belongs to */
  204         uint32_t igi_version;   /* IGMPv3 Host Compatibility Mode */
  205         uint32_t igi_v1_timer;  /* IGMPv1 Querier Present timer (s) */
  206         uint32_t igi_v2_timer;  /* IGMPv2 Querier Present timer (s) */
  207         uint32_t igi_v3_timer;  /* IGMPv3 General Query (interface) timer (s)*/
  208         uint32_t igi_flags;     /* IGMP per-interface flags */
  209         uint32_t igi_rv;        /* IGMPv3 Robustness Variable */
  210         uint32_t igi_qi;        /* IGMPv3 Query Interval (s) */
  211         uint32_t igi_qri;       /* IGMPv3 Query Response Interval (s) */
  212         uint32_t igi_uri;       /* IGMPv3 Unsolicited Report Interval (s) */
  213         SLIST_HEAD(,in_multi)   igi_relinmhead; /* released groups */
  214         struct ifqueue   igi_gq;        /* queue of general query responses */
  215 };
  216 
  217 #define IGIF_SILENT     0x00000001      /* Do not use IGMP on this ifp */
  218 #define IGIF_LOOPBACK   0x00000002      /* Send IGMP reports to loopback */
  219 
  220 /*
  221  * IPv4 multicast IGMP-layer source entry.
  222  */
  223 struct ip_msource {
  224         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
  225         in_addr_t               ims_haddr;      /* host byte order */
  226         struct ims_st {
  227                 uint16_t        ex;             /* # of exclusive members */
  228                 uint16_t        in;             /* # of inclusive members */
  229         }                       ims_st[2];      /* state at t0, t1 */
  230         uint8_t                 ims_stp;        /* pending query */
  231 };
  232 
  233 /*
  234  * IPv4 multicast PCB-layer source entry.
  235  */
  236 struct in_msource {
  237         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
  238         in_addr_t               ims_haddr;      /* host byte order */
  239         uint8_t                 imsl_st[2];     /* state before/at commit */
  240 };
  241 
  242 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
  243 
  244 static __inline int
  245 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
  246 {
  247 
  248         if (a->ims_haddr < b->ims_haddr)
  249                 return (-1);
  250         if (a->ims_haddr == b->ims_haddr)
  251                 return (0);
  252         return (1);
  253 }
  254 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
  255 
  256 /*
  257  * IPv4 multicast PCB-layer group filter descriptor.
  258  */
  259 struct in_mfilter {
  260         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
  261         u_long                  imf_nsrc;    /* # of source entries */
  262         uint8_t                 imf_st[2];   /* state before/at commit */
  263 };
  264 
  265 /*
  266  * IPv4 group descriptor.
  267  *
  268  * For every entry on an ifnet's if_multiaddrs list which represents
  269  * an IP multicast group, there is one of these structures.
  270  *
  271  * If any source filters are present, then a node will exist in the RB-tree
  272  * to permit fast lookup by source whenever an operation takes place.
  273  * This permits pre-order traversal when we issue reports.
  274  * Source filter trees are kept separately from the socket layer to
  275  * greatly simplify locking.
  276  *
  277  * When IGMPv3 is active, inm_timer is the response to group query timer.
  278  * The state-change timer inm_sctimer is separate; whenever state changes
  279  * for the group the state change record is generated and transmitted,
  280  * and kept if retransmissions are necessary.
  281  *
  282  * FUTURE: inm_link is now only used when groups are being purged
  283  * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
  284  * because it is at the very start of the struct, we can't do this
  285  * w/o breaking the ABI for ifmcstat.
  286  */
  287 struct in_multi {
  288         LIST_ENTRY(in_multi) inm_link;  /* to-be-released by in_ifdetach */
  289         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  290         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  291         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  292         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer */
  293         u_int   inm_state;              /* state of the membership */
  294         void    *inm_rti;               /* unused, legacy field */
  295         u_int   inm_refcount;           /* reference count */
  296 
  297         /* New fields for IGMPv3 follow. */
  298         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
  299         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
  300         struct ip_msource_tree   inm_srcs;      /* tree of sources */
  301         u_long                   inm_nsrc;      /* # of tree entries */
  302 
  303         struct ifqueue           inm_scq;       /* queue of pending
  304                                                  * state-change packets */
  305         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
  306         uint16_t                 inm_sctimer;   /* state-change timer */
  307         uint16_t                 inm_scrv;      /* state-change rexmit count */
  308 
  309         /*
  310          * SSM state counters which track state at T0 (the time the last
  311          * state-change report's RV timer went to zero) and T1
  312          * (time of pending report, i.e. now).
  313          * Used for computing IGMPv3 state-change reports. Several refcounts
  314          * are maintained here to optimize for common use-cases.
  315          */
  316         struct inm_st {
  317                 uint16_t        iss_fmode;      /* IGMP filter mode */
  318                 uint16_t        iss_asm;        /* # of ASM listeners */
  319                 uint16_t        iss_ex;         /* # of exclusive members */
  320                 uint16_t        iss_in;         /* # of inclusive members */
  321                 uint16_t        iss_rec;        /* # of recorded sources */
  322         }                       inm_st[2];      /* state at t0, t1 */
  323 };
  324 
  325 /*
  326  * Helper function to derive the filter mode on a source entry
  327  * from its internal counters. Predicates are:
  328  *  A source is only excluded if all listeners exclude it.
  329  *  A source is only included if no listeners exclude it,
  330  *  and at least one listener includes it.
  331  * May be used by ifmcstat(8).
  332  */
  333 static __inline uint8_t
  334 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
  335     uint8_t t)
  336 {
  337 
  338         t = !!t;
  339         if (inm->inm_st[t].iss_ex > 0 &&
  340             inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
  341                 return (MCAST_EXCLUDE);
  342         else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
  343                 return (MCAST_INCLUDE);
  344         return (MCAST_UNDEFINED);
  345 }
  346 
  347 #ifdef _KERNEL
  348 
  349 #ifdef SYSCTL_DECL
  350 SYSCTL_DECL(_net_inet);
  351 SYSCTL_DECL(_net_inet_ip);
  352 SYSCTL_DECL(_net_inet_raw);
  353 #endif
  354 
  355 /*
  356  * Lock macros for IPv4 layer multicast address lists.  IPv4 lock goes
  357  * before link layer multicast locks in the lock order.  In most cases,
  358  * consumers of IN_*_MULTI() macros should acquire the locks before
  359  * calling them; users of the in_{add,del}multi() functions should not.
  360  */
  361 extern struct mtx in_multi_mtx;
  362 #define IN_MULTI_LOCK()         mtx_lock(&in_multi_mtx)
  363 #define IN_MULTI_UNLOCK()       mtx_unlock(&in_multi_mtx)
  364 #define IN_MULTI_LOCK_ASSERT()  mtx_assert(&in_multi_mtx, MA_OWNED)
  365 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED)
  366 
  367 /*
  368  * Function for looking up an in_multi record for an IPv4 multicast address
  369  * on a given interface. ifp must be valid. If no record found, return NULL.
  370  * The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held.
  371  */
  372 static __inline struct in_multi *
  373 inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina)
  374 {
  375         struct ifmultiaddr *ifma;
  376         struct in_multi *inm;
  377 
  378         IN_MULTI_LOCK_ASSERT();
  379         IF_ADDR_LOCK_ASSERT(ifp);
  380 
  381         inm = NULL;
  382         TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) {
  383                 if (ifma->ifma_addr->sa_family == AF_INET) {
  384                         inm = (struct in_multi *)ifma->ifma_protospec;
  385                         if (inm->inm_addr.s_addr == ina.s_addr)
  386                                 break;
  387                         inm = NULL;
  388                 }
  389         }
  390         return (inm);
  391 }
  392 
  393 /*
  394  * Wrapper for inm_lookup_locked().
  395  * The IF_ADDR_LOCK will be taken on ifp and released on return.
  396  */
  397 static __inline struct in_multi *
  398 inm_lookup(struct ifnet *ifp, const struct in_addr ina)
  399 {
  400         struct in_multi *inm;
  401 
  402         IN_MULTI_LOCK_ASSERT();
  403         IF_ADDR_RLOCK(ifp);
  404         inm = inm_lookup_locked(ifp, ina);
  405         IF_ADDR_RUNLOCK(ifp);
  406 
  407         return (inm);
  408 }
  409 
  410 /* Acquire an in_multi record. */
  411 static __inline void
  412 inm_acquire_locked(struct in_multi *inm)
  413 {
  414 
  415         IN_MULTI_LOCK_ASSERT();
  416         ++inm->inm_refcount;
  417 }
  418 
  419 /*
  420  * Return values for imo_multi_filter().
  421  */
  422 #define MCAST_PASS              0       /* Pass */
  423 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
  424 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
  425 #define MCAST_MUTED             3       /* [deprecated] */
  426 
  427 struct  rtentry;
  428 struct  route;
  429 struct  ip_moptions;
  430 struct radix_node_head;
  431 
  432 int     imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
  433             const struct sockaddr *, const struct sockaddr *);
  434 void    inm_commit(struct in_multi *);
  435 void    inm_clear_recorded(struct in_multi *);
  436 void    inm_print(const struct in_multi *);
  437 int     inm_record_source(struct in_multi *inm, const in_addr_t);
  438 void    inm_release(struct in_multi *);
  439 void    inm_release_locked(struct in_multi *);
  440 struct  in_multi *
  441         in_addmulti(struct in_addr *, struct ifnet *);
  442 void    in_delmulti(struct in_multi *);
  443 int     in_joingroup(struct ifnet *, const struct in_addr *,
  444             /*const*/ struct in_mfilter *, struct in_multi **);
  445 int     in_joingroup_locked(struct ifnet *, const struct in_addr *,
  446             /*const*/ struct in_mfilter *, struct in_multi **);
  447 int     in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
  448 int     in_leavegroup_locked(struct in_multi *,
  449             /*const*/ struct in_mfilter *);
  450 int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,
  451             struct thread *);
  452 void    in_rtqdrain(void);
  453 int     in_addprefix(struct in_ifaddr *, int);
  454 int     in_scrubprefix(struct in_ifaddr *, u_int);
  455 void    ip_input(struct mbuf *);
  456 int     in_ifadown(struct ifaddr *ifa, int);
  457 void    in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int);
  458 struct  mbuf    *ip_fastforward(struct mbuf *);
  459 void    *in_domifattach(struct ifnet *);
  460 void    in_domifdetach(struct ifnet *, void *);
  461 
  462 
  463 /* XXX */
  464 void     in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum);
  465 void     in_rtalloc(struct route *ro, u_int fibnum);
  466 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int);
  467 void     in_rtredirect(struct sockaddr *, struct sockaddr *,
  468             struct sockaddr *, int, struct sockaddr *, u_int);
  469 int      in_rtrequest(int, struct sockaddr *,
  470             struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
  471 void    in_setmatchfunc(struct radix_node_head *, int);
  472 
  473 #if 0
  474 int      in_rt_getifa(struct rt_addrinfo *, u_int fibnum);
  475 int      in_rtioctl(u_long, caddr_t, u_int);
  476 int      in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int);
  477 #endif
  478 #endif /* _KERNEL */
  479 
  480 /* INET6 stuff */
  481 #include <netinet6/in6_var.h>
  482 
  483 #endif /* _NETINET_IN_VAR_H_ */

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