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: stable/9/sys/netinet/in_var.h 242640 2012-11-06 00:49:52Z melifaro $
   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 #include <sys/tree.h>
   39 
   40 struct igmp_ifinfo;
   41 struct in_multi;
   42 struct lltable;
   43 
   44 /*
   45  * IPv4 per-interface state.
   46  */
   47 struct in_ifinfo {
   48         struct lltable          *ii_llt;        /* ARP state */
   49         struct igmp_ifinfo      *ii_igmp;       /* IGMP state */
   50         struct in_multi         *ii_allhosts;   /* 224.0.0.1 membership */
   51 };
   52 
   53 /*
   54  * Interface address, Internet version.  One of these structures
   55  * is allocated for each Internet address on an interface.
   56  * The ifaddr structure contains the protocol-independent part
   57  * of the structure and is assumed to be first.
   58  */
   59 struct in_ifaddr {
   60         struct  ifaddr ia_ifa;          /* protocol-independent info */
   61 #define ia_ifp          ia_ifa.ifa_ifp
   62 #define ia_flags        ia_ifa.ifa_flags
   63                                         /* ia_subnet{,mask} in host order */
   64         u_long  ia_subnet;              /* subnet address */
   65         u_long  ia_subnetmask;          /* mask of subnet */
   66         LIST_ENTRY(in_ifaddr) ia_hash;  /* entry in bucket of inet addresses */
   67         TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
   68         struct  sockaddr_in ia_addr;    /* reserve space for interface name */
   69         struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
   70 #define ia_broadaddr    ia_dstaddr
   71         struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
   72 };
   73 
   74 struct  in_aliasreq {
   75         char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
   76         struct  sockaddr_in ifra_addr;
   77         struct  sockaddr_in ifra_broadaddr;
   78 #define ifra_dstaddr ifra_broadaddr
   79         struct  sockaddr_in ifra_mask;
   80 };
   81 /*
   82  * Given a pointer to an in_ifaddr (ifaddr),
   83  * return a pointer to the addr as a sockaddr_in.
   84  */
   85 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
   86 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
   87 
   88 #define IN_LNAOF(in, ifa) \
   89         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
   90 
   91 
   92 #ifdef  _KERNEL
   93 extern  u_char  inetctlerrmap[];
   94 
   95 #define LLTABLE(ifp)    \
   96         ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
   97 /*
   98  * Hash table for IP addresses.
   99  */
  100 TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
  101 LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
  102 
  103 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
  104 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
  105 VNET_DECLARE(u_long, in_ifaddrhmask);           /* mask for hash table */
  106 
  107 #define V_in_ifaddrhashtbl      VNET(in_ifaddrhashtbl)
  108 #define V_in_ifaddrhead         VNET(in_ifaddrhead)
  109 #define V_in_ifaddrhmask        VNET(in_ifaddrhmask)
  110 
  111 #define INADDR_NHASH_LOG2       9
  112 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
  113 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
  114 #define INADDR_HASH(x) \
  115         (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
  116 
  117 extern  struct rwlock in_ifaddr_lock;
  118 
  119 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED)
  120 #define IN_IFADDR_RLOCK()       rw_rlock(&in_ifaddr_lock)
  121 #define IN_IFADDR_RLOCK_ASSERT()        rw_assert(&in_ifaddr_lock, RA_RLOCKED)
  122 #define IN_IFADDR_RUNLOCK()     rw_runlock(&in_ifaddr_lock)
  123 #define IN_IFADDR_WLOCK()       rw_wlock(&in_ifaddr_lock)
  124 #define IN_IFADDR_WLOCK_ASSERT()        rw_assert(&in_ifaddr_lock, RA_WLOCKED)
  125 #define IN_IFADDR_WUNLOCK()     rw_wunlock(&in_ifaddr_lock)
  126 
  127 /*
  128  * Macro for finding the internet address structure (in_ifaddr)
  129  * corresponding to one of our IP addresses (in_addr).
  130  */
  131 #define INADDR_TO_IFADDR(addr, ia) \
  132         /* struct in_addr addr; */ \
  133         /* struct in_ifaddr *ia; */ \
  134 do { \
  135 \
  136         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  137                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  138                         break; \
  139 } while (0)
  140 
  141 /*
  142  * Macro for finding the interface (ifnet structure) corresponding to one
  143  * of our IP addresses.
  144  */
  145 #define INADDR_TO_IFP(addr, ifp) \
  146         /* struct in_addr addr; */ \
  147         /* struct ifnet *ifp; */ \
  148 { \
  149         struct in_ifaddr *ia; \
  150 \
  151         INADDR_TO_IFADDR(addr, ia); \
  152         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  153 }
  154 
  155 /*
  156  * Macro for finding the internet address structure (in_ifaddr) corresponding
  157  * to a given interface (ifnet structure).
  158  */
  159 #define IFP_TO_IA(ifp, ia)                                              \
  160         /* struct ifnet *ifp; */                                        \
  161         /* struct in_ifaddr *ia; */                                     \
  162 do {                                                                    \
  163         IN_IFADDR_RLOCK();                                              \
  164         for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead);                      \
  165             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
  166             (ia) = TAILQ_NEXT((ia), ia_link))                           \
  167                 continue;                                               \
  168         if ((ia) != NULL)                                               \
  169                 ifa_ref(&(ia)->ia_ifa);                                 \
  170         IN_IFADDR_RUNLOCK();                                            \
  171 } while (0)
  172 #endif
  173 
  174 /*
  175  * IP datagram reassembly.
  176  */
  177 #define IPREASS_NHASH_LOG2      6
  178 #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
  179 #define IPREASS_HMASK           (IPREASS_NHASH - 1)
  180 #define IPREASS_HASH(x,y) \
  181         (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
  182 
  183 /*
  184  * Legacy IPv4 IGMP per-link structure.
  185  */
  186 struct router_info {
  187         struct ifnet *rti_ifp;
  188         int    rti_type; /* type of router which is querier on this interface */
  189         int    rti_time; /* # of slow timeouts since last old query */
  190         SLIST_ENTRY(router_info) rti_list;
  191 };
  192 
  193 /*
  194  * Per-interface IGMP router version information.
  195  */
  196 struct igmp_ifinfo {
  197         LIST_ENTRY(igmp_ifinfo) igi_link;
  198         struct ifnet *igi_ifp;  /* interface this instance belongs to */
  199         uint32_t igi_version;   /* IGMPv3 Host Compatibility Mode */
  200         uint32_t igi_v1_timer;  /* IGMPv1 Querier Present timer (s) */
  201         uint32_t igi_v2_timer;  /* IGMPv2 Querier Present timer (s) */
  202         uint32_t igi_v3_timer;  /* IGMPv3 General Query (interface) timer (s)*/
  203         uint32_t igi_flags;     /* IGMP per-interface flags */
  204         uint32_t igi_rv;        /* IGMPv3 Robustness Variable */
  205         uint32_t igi_qi;        /* IGMPv3 Query Interval (s) */
  206         uint32_t igi_qri;       /* IGMPv3 Query Response Interval (s) */
  207         uint32_t igi_uri;       /* IGMPv3 Unsolicited Report Interval (s) */
  208         SLIST_HEAD(,in_multi)   igi_relinmhead; /* released groups */
  209         struct ifqueue   igi_gq;        /* queue of general query responses */
  210 };
  211 
  212 #define IGIF_SILENT     0x00000001      /* Do not use IGMP on this ifp */
  213 #define IGIF_LOOPBACK   0x00000002      /* Send IGMP reports to loopback */
  214 
  215 /*
  216  * IPv4 multicast IGMP-layer source entry.
  217  */
  218 struct ip_msource {
  219         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
  220         in_addr_t               ims_haddr;      /* host byte order */
  221         struct ims_st {
  222                 uint16_t        ex;             /* # of exclusive members */
  223                 uint16_t        in;             /* # of inclusive members */
  224         }                       ims_st[2];      /* state at t0, t1 */
  225         uint8_t                 ims_stp;        /* pending query */
  226 };
  227 
  228 /*
  229  * IPv4 multicast PCB-layer source entry.
  230  */
  231 struct in_msource {
  232         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
  233         in_addr_t               ims_haddr;      /* host byte order */
  234         uint8_t                 imsl_st[2];     /* state before/at commit */
  235 };
  236 
  237 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
  238 
  239 static __inline int
  240 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
  241 {
  242 
  243         if (a->ims_haddr < b->ims_haddr)
  244                 return (-1);
  245         if (a->ims_haddr == b->ims_haddr)
  246                 return (0);
  247         return (1);
  248 }
  249 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
  250 
  251 /*
  252  * IPv4 multicast PCB-layer group filter descriptor.
  253  */
  254 struct in_mfilter {
  255         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
  256         u_long                  imf_nsrc;    /* # of source entries */
  257         uint8_t                 imf_st[2];   /* state before/at commit */
  258 };
  259 
  260 /*
  261  * IPv4 group descriptor.
  262  *
  263  * For every entry on an ifnet's if_multiaddrs list which represents
  264  * an IP multicast group, there is one of these structures.
  265  *
  266  * If any source filters are present, then a node will exist in the RB-tree
  267  * to permit fast lookup by source whenever an operation takes place.
  268  * This permits pre-order traversal when we issue reports.
  269  * Source filter trees are kept separately from the socket layer to
  270  * greatly simplify locking.
  271  *
  272  * When IGMPv3 is active, inm_timer is the response to group query timer.
  273  * The state-change timer inm_sctimer is separate; whenever state changes
  274  * for the group the state change record is generated and transmitted,
  275  * and kept if retransmissions are necessary.
  276  *
  277  * FUTURE: inm_link is now only used when groups are being purged
  278  * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
  279  * because it is at the very start of the struct, we can't do this
  280  * w/o breaking the ABI for ifmcstat.
  281  */
  282 struct in_multi {
  283         LIST_ENTRY(in_multi) inm_link;  /* to-be-released by in_ifdetach */
  284         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  285         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  286         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  287         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer */
  288         u_int   inm_state;              /* state of the membership */
  289         void    *inm_rti;               /* unused, legacy field */
  290         u_int   inm_refcount;           /* reference count */
  291 
  292         /* New fields for IGMPv3 follow. */
  293         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
  294         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
  295         struct ip_msource_tree   inm_srcs;      /* tree of sources */
  296         u_long                   inm_nsrc;      /* # of tree entries */
  297 
  298         struct ifqueue           inm_scq;       /* queue of pending
  299                                                  * state-change packets */
  300         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
  301         uint16_t                 inm_sctimer;   /* state-change timer */
  302         uint16_t                 inm_scrv;      /* state-change rexmit count */
  303 
  304         /*
  305          * SSM state counters which track state at T0 (the time the last
  306          * state-change report's RV timer went to zero) and T1
  307          * (time of pending report, i.e. now).
  308          * Used for computing IGMPv3 state-change reports. Several refcounts
  309          * are maintained here to optimize for common use-cases.
  310          */
  311         struct inm_st {
  312                 uint16_t        iss_fmode;      /* IGMP filter mode */
  313                 uint16_t        iss_asm;        /* # of ASM listeners */
  314                 uint16_t        iss_ex;         /* # of exclusive members */
  315                 uint16_t        iss_in;         /* # of inclusive members */
  316                 uint16_t        iss_rec;        /* # of recorded sources */
  317         }                       inm_st[2];      /* state at t0, t1 */
  318 };
  319 
  320 /*
  321  * Helper function to derive the filter mode on a source entry
  322  * from its internal counters. Predicates are:
  323  *  A source is only excluded if all listeners exclude it.
  324  *  A source is only included if no listeners exclude it,
  325  *  and at least one listener includes it.
  326  * May be used by ifmcstat(8).
  327  */
  328 static __inline uint8_t
  329 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
  330     uint8_t t)
  331 {
  332 
  333         t = !!t;
  334         if (inm->inm_st[t].iss_ex > 0 &&
  335             inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
  336                 return (MCAST_EXCLUDE);
  337         else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
  338                 return (MCAST_INCLUDE);
  339         return (MCAST_UNDEFINED);
  340 }
  341 
  342 #ifdef _KERNEL
  343 
  344 #ifdef SYSCTL_DECL
  345 SYSCTL_DECL(_net_inet);
  346 SYSCTL_DECL(_net_inet_ip);
  347 SYSCTL_DECL(_net_inet_raw);
  348 #endif
  349 
  350 /*
  351  * Lock macros for IPv4 layer multicast address lists.  IPv4 lock goes
  352  * before link layer multicast locks in the lock order.  In most cases,
  353  * consumers of IN_*_MULTI() macros should acquire the locks before
  354  * calling them; users of the in_{add,del}multi() functions should not.
  355  */
  356 extern struct mtx in_multi_mtx;
  357 #define IN_MULTI_LOCK()         mtx_lock(&in_multi_mtx)
  358 #define IN_MULTI_UNLOCK()       mtx_unlock(&in_multi_mtx)
  359 #define IN_MULTI_LOCK_ASSERT()  mtx_assert(&in_multi_mtx, MA_OWNED)
  360 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED)
  361 
  362 /*
  363  * Function for looking up an in_multi record for an IPv4 multicast address
  364  * on a given interface. ifp must be valid. If no record found, return NULL.
  365  * The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held.
  366  */
  367 static __inline struct in_multi *
  368 inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina)
  369 {
  370         struct ifmultiaddr *ifma;
  371         struct in_multi *inm;
  372 
  373         IN_MULTI_LOCK_ASSERT();
  374         IF_ADDR_LOCK_ASSERT(ifp);
  375 
  376         inm = NULL;
  377         TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) {
  378                 if (ifma->ifma_addr->sa_family == AF_INET) {
  379                         inm = (struct in_multi *)ifma->ifma_protospec;
  380                         if (inm->inm_addr.s_addr == ina.s_addr)
  381                                 break;
  382                         inm = NULL;
  383                 }
  384         }
  385         return (inm);
  386 }
  387 
  388 /*
  389  * Wrapper for inm_lookup_locked().
  390  * The IF_ADDR_LOCK will be taken on ifp and released on return.
  391  */
  392 static __inline struct in_multi *
  393 inm_lookup(struct ifnet *ifp, const struct in_addr ina)
  394 {
  395         struct in_multi *inm;
  396 
  397         IN_MULTI_LOCK_ASSERT();
  398         IF_ADDR_RLOCK(ifp);
  399         inm = inm_lookup_locked(ifp, ina);
  400         IF_ADDR_RUNLOCK(ifp);
  401 
  402         return (inm);
  403 }
  404 
  405 /* Acquire an in_multi record. */
  406 static __inline void
  407 inm_acquire_locked(struct in_multi *inm)
  408 {
  409 
  410         IN_MULTI_LOCK_ASSERT();
  411         ++inm->inm_refcount;
  412 }
  413 
  414 /*
  415  * Return values for imo_multi_filter().
  416  */
  417 #define MCAST_PASS              0       /* Pass */
  418 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
  419 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
  420 #define MCAST_MUTED             3       /* [deprecated] */
  421 
  422 struct  rtentry;
  423 struct  route;
  424 struct  ip_moptions;
  425 struct radix_node_head;
  426 
  427 int     imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
  428             const struct sockaddr *, const struct sockaddr *);
  429 void    inm_commit(struct in_multi *);
  430 void    inm_clear_recorded(struct in_multi *);
  431 void    inm_print(const struct in_multi *);
  432 int     inm_record_source(struct in_multi *inm, const in_addr_t);
  433 void    inm_release(struct in_multi *);
  434 void    inm_release_locked(struct in_multi *);
  435 struct  in_multi *
  436         in_addmulti(struct in_addr *, struct ifnet *);
  437 void    in_delmulti(struct in_multi *);
  438 int     in_joingroup(struct ifnet *, const struct in_addr *,
  439             /*const*/ struct in_mfilter *, struct in_multi **);
  440 int     in_joingroup_locked(struct ifnet *, const struct in_addr *,
  441             /*const*/ struct in_mfilter *, struct in_multi **);
  442 int     in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
  443 int     in_leavegroup_locked(struct in_multi *,
  444             /*const*/ struct in_mfilter *);
  445 int     in_control(struct socket *, u_long, caddr_t, struct ifnet *,
  446             struct thread *);
  447 void    in_rtqdrain(void);
  448 void    ip_input(struct mbuf *);
  449 int     in_ifadown(struct ifaddr *ifa, int);
  450 void    in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int);
  451 struct  mbuf    *ip_fastforward(struct mbuf *);
  452 void    *in_domifattach(struct ifnet *);
  453 void    in_domifdetach(struct ifnet *, void *);
  454 
  455 
  456 /* XXX */
  457 void     in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum);
  458 void     in_rtalloc(struct route *ro, u_int fibnum);
  459 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int);
  460 void     in_rtredirect(struct sockaddr *, struct sockaddr *,
  461             struct sockaddr *, int, struct sockaddr *, u_int);
  462 int      in_rtrequest(int, struct sockaddr *,
  463             struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
  464 void    in_setmatchfunc(struct radix_node_head *, int);
  465 
  466 #if 0
  467 int      in_rt_getifa(struct rt_addrinfo *, u_int fibnum);
  468 int      in_rtioctl(u_long, caddr_t, u_int);
  469 int      in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int);
  470 #endif
  471 #endif /* _KERNEL */
  472 
  473 /* INET6 stuff */
  474 #include <netinet6/in6_var.h>
  475 
  476 #endif /* _NETINET_IN_VAR_H_ */

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