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/8.2/sys/netinet/in_var.h 199583 2009-11-20 15:27:52Z jhb $
   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_{,sub}net{,mask} in host order */
   64         u_long  ia_net;                 /* network number of interface */
   65         u_long  ia_netmask;             /* mask of net part */
   66         u_long  ia_subnet;              /* subnet number, including net */
   67         u_long  ia_subnetmask;          /* mask of subnet part */
   68         struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */
   69         LIST_ENTRY(in_ifaddr) ia_hash;  /* entry in bucket of inet addresses */
   70         TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
   71         struct  sockaddr_in ia_addr;    /* reserve space for interface name */
   72         struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
   73 #define ia_broadaddr    ia_dstaddr
   74         struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
   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 };
   84 /*
   85  * Given a pointer to an in_ifaddr (ifaddr),
   86  * return a pointer to the addr as a sockaddr_in.
   87  */
   88 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
   89 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
   90 
   91 #define IN_LNAOF(in, ifa) \
   92         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
   93 
   94 
   95 #ifdef  _KERNEL
   96 extern  u_char  inetctlerrmap[];
   97 
   98 #define LLTABLE(ifp)    \
   99         ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
  100 /*
  101  * Hash table for IP addresses.
  102  */
  103 TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
  104 LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
  105 
  106 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
  107 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
  108 VNET_DECLARE(u_long, in_ifaddrhmask);           /* mask for hash table */
  109 
  110 #define V_in_ifaddrhashtbl      VNET(in_ifaddrhashtbl)
  111 #define V_in_ifaddrhead         VNET(in_ifaddrhead)
  112 #define V_in_ifaddrhmask        VNET(in_ifaddrhmask)
  113 
  114 #define INADDR_NHASH_LOG2       9
  115 #define INADDR_NHASH            (1 << INADDR_NHASH_LOG2)
  116 #define INADDR_HASHVAL(x)       fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
  117 #define INADDR_HASH(x) \
  118         (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
  119 
  120 extern  struct rwlock in_ifaddr_lock;
  121 
  122 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED)
  123 #define IN_IFADDR_RLOCK()       rw_rlock(&in_ifaddr_lock)
  124 #define IN_IFADDR_RLOCK_ASSERT()        rw_assert(&in_ifaddr_lock, RA_RLOCKED)
  125 #define IN_IFADDR_RUNLOCK()     rw_runlock(&in_ifaddr_lock)
  126 #define IN_IFADDR_WLOCK()       rw_wlock(&in_ifaddr_lock)
  127 #define IN_IFADDR_WLOCK_ASSERT()        rw_assert(&in_ifaddr_lock, RA_WLOCKED)
  128 #define IN_IFADDR_WUNLOCK()     rw_wunlock(&in_ifaddr_lock)
  129 
  130 /*
  131  * Macro for finding the internet address structure (in_ifaddr)
  132  * corresponding to one of our IP addresses (in_addr).
  133  */
  134 #define INADDR_TO_IFADDR(addr, ia) \
  135         /* struct in_addr addr; */ \
  136         /* struct in_ifaddr *ia; */ \
  137 do { \
  138 \
  139         LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
  140                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
  141                         break; \
  142 } while (0)
  143 
  144 /*
  145  * Macro for finding the interface (ifnet structure) corresponding to one
  146  * of our IP addresses.
  147  */
  148 #define INADDR_TO_IFP(addr, ifp) \
  149         /* struct in_addr addr; */ \
  150         /* struct ifnet *ifp; */ \
  151 { \
  152         struct in_ifaddr *ia; \
  153 \
  154         INADDR_TO_IFADDR(addr, ia); \
  155         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
  156 }
  157 
  158 /*
  159  * Macro for finding the internet address structure (in_ifaddr) corresponding
  160  * to a given interface (ifnet structure).
  161  */
  162 #define IFP_TO_IA(ifp, ia)                                              \
  163         /* struct ifnet *ifp; */                                        \
  164         /* struct in_ifaddr *ia; */                                     \
  165 {                                                                       \
  166         for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead);                      \
  167             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
  168             (ia) = TAILQ_NEXT((ia), ia_link))                           \
  169                 continue;                                               \
  170         if ((ia) != NULL)                                               \
  171                 ifa_ref(&(ia)->ia_ifa);                                 \
  172 }
  173 #endif
  174 
  175 /*
  176  * IP datagram reassembly.
  177  */
  178 #define IPREASS_NHASH_LOG2      6
  179 #define IPREASS_NHASH           (1 << IPREASS_NHASH_LOG2)
  180 #define IPREASS_HMASK           (IPREASS_NHASH - 1)
  181 #define IPREASS_HASH(x,y) \
  182         (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
  183 
  184 /*
  185  * Legacy IPv4 IGMP per-link structure.
  186  */
  187 struct router_info {
  188         struct ifnet *rti_ifp;
  189         int    rti_type; /* type of router which is querier on this interface */
  190         int    rti_time; /* # of slow timeouts since last old query */
  191         SLIST_ENTRY(router_info) rti_list;
  192 };
  193 
  194 /*
  195  * Per-interface IGMP router version information.
  196  */
  197 struct igmp_ifinfo {
  198         LIST_ENTRY(igmp_ifinfo) igi_link;
  199         struct ifnet *igi_ifp;  /* interface this instance belongs to */
  200         uint32_t igi_version;   /* IGMPv3 Host Compatibility Mode */
  201         uint32_t igi_v1_timer;  /* IGMPv1 Querier Present timer (s) */
  202         uint32_t igi_v2_timer;  /* IGMPv2 Querier Present timer (s) */
  203         uint32_t igi_v3_timer;  /* IGMPv3 General Query (interface) timer (s)*/
  204         uint32_t igi_flags;     /* IGMP per-interface flags */
  205         uint32_t igi_rv;        /* IGMPv3 Robustness Variable */
  206         uint32_t igi_qi;        /* IGMPv3 Query Interval (s) */
  207         uint32_t igi_qri;       /* IGMPv3 Query Response Interval (s) */
  208         uint32_t igi_uri;       /* IGMPv3 Unsolicited Report Interval (s) */
  209         SLIST_HEAD(,in_multi)   igi_relinmhead; /* released groups */
  210         struct ifqueue   igi_gq;        /* queue of general query responses */
  211 };
  212 
  213 #define IGIF_SILENT     0x00000001      /* Do not use IGMP on this ifp */
  214 #define IGIF_LOOPBACK   0x00000002      /* Send IGMP reports to loopback */
  215 
  216 /*
  217  * IPv4 multicast IGMP-layer source entry.
  218  */
  219 struct ip_msource {
  220         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
  221         in_addr_t               ims_haddr;      /* host byte order */
  222         struct ims_st {
  223                 uint16_t        ex;             /* # of exclusive members */
  224                 uint16_t        in;             /* # of inclusive members */
  225         }                       ims_st[2];      /* state at t0, t1 */
  226         uint8_t                 ims_stp;        /* pending query */
  227 };
  228 
  229 /*
  230  * IPv4 multicast PCB-layer source entry.
  231  */
  232 struct in_msource {
  233         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
  234         in_addr_t               ims_haddr;      /* host byte order */
  235         uint8_t                 imsl_st[2];     /* state before/at commit */
  236 };
  237 
  238 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
  239 
  240 static __inline int
  241 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
  242 {
  243 
  244         if (a->ims_haddr < b->ims_haddr)
  245                 return (-1);
  246         if (a->ims_haddr == b->ims_haddr)
  247                 return (0);
  248         return (1);
  249 }
  250 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
  251 
  252 /*
  253  * IPv4 multicast PCB-layer group filter descriptor.
  254  */
  255 struct in_mfilter {
  256         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
  257         u_long                  imf_nsrc;    /* # of source entries */
  258         uint8_t                 imf_st[2];   /* state before/at commit */
  259 };
  260 
  261 /*
  262  * IPv4 group descriptor.
  263  *
  264  * For every entry on an ifnet's if_multiaddrs list which represents
  265  * an IP multicast group, there is one of these structures.
  266  *
  267  * If any source filters are present, then a node will exist in the RB-tree
  268  * to permit fast lookup by source whenever an operation takes place.
  269  * This permits pre-order traversal when we issue reports.
  270  * Source filter trees are kept separately from the socket layer to
  271  * greatly simplify locking.
  272  *
  273  * When IGMPv3 is active, inm_timer is the response to group query timer.
  274  * The state-change timer inm_sctimer is separate; whenever state changes
  275  * for the group the state change record is generated and transmitted,
  276  * and kept if retransmissions are necessary.
  277  *
  278  * FUTURE: inm_link is now only used when groups are being purged
  279  * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
  280  * because it is at the very start of the struct, we can't do this
  281  * w/o breaking the ABI for ifmcstat.
  282  */
  283 struct in_multi {
  284         LIST_ENTRY(in_multi) inm_link;  /* to-be-released by in_ifdetach */
  285         struct  in_addr inm_addr;       /* IP multicast address, convenience */
  286         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
  287         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
  288         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer */
  289         u_int   inm_state;              /* state of the membership */
  290         void    *inm_rti;               /* unused, legacy field */
  291         u_int   inm_refcount;           /* reference count */
  292 
  293         /* New fields for IGMPv3 follow. */
  294         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
  295         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
  296         struct ip_msource_tree   inm_srcs;      /* tree of sources */
  297         u_long                   inm_nsrc;      /* # of tree entries */
  298 
  299         struct ifqueue           inm_scq;       /* queue of pending
  300                                                  * state-change packets */
  301         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
  302         uint16_t                 inm_sctimer;   /* state-change timer */
  303         uint16_t                 inm_scrv;      /* state-change rexmit count */
  304 
  305         /*
  306          * SSM state counters which track state at T0 (the time the last
  307          * state-change report's RV timer went to zero) and T1
  308          * (time of pending report, i.e. now).
  309          * Used for computing IGMPv3 state-change reports. Several refcounts
  310          * are maintained here to optimize for common use-cases.
  311          */
  312         struct inm_st {
  313                 uint16_t        iss_fmode;      /* IGMP filter mode */
  314                 uint16_t        iss_asm;        /* # of ASM listeners */
  315                 uint16_t        iss_ex;         /* # of exclusive members */
  316                 uint16_t        iss_in;         /* # of inclusive members */
  317                 uint16_t        iss_rec;        /* # of recorded sources */
  318         }                       inm_st[2];      /* state at t0, t1 */
  319 };
  320 
  321 /*
  322  * Helper function to derive the filter mode on a source entry
  323  * from its internal counters. Predicates are:
  324  *  A source is only excluded if all listeners exclude it.
  325  *  A source is only included if no listeners exclude it,
  326  *  and at least one listener includes it.
  327  * May be used by ifmcstat(8).
  328  */
  329 static __inline uint8_t
  330 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
  331     uint8_t t)
  332 {
  333 
  334         t = !!t;
  335         if (inm->inm_st[t].iss_ex > 0 &&
  336             inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
  337                 return (MCAST_EXCLUDE);
  338         else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
  339                 return (MCAST_INCLUDE);
  340         return (MCAST_UNDEFINED);
  341 }
  342 
  343 #ifdef _KERNEL
  344 
  345 #ifdef SYSCTL_DECL
  346 SYSCTL_DECL(_net_inet);
  347 SYSCTL_DECL(_net_inet_ip);
  348 SYSCTL_DECL(_net_inet_raw);
  349 #endif
  350 
  351 /*
  352  * Lock macros for IPv4 layer multicast address lists.  IPv4 lock goes
  353  * before link layer multicast locks in the lock order.  In most cases,
  354  * consumers of IN_*_MULTI() macros should acquire the locks before
  355  * calling them; users of the in_{add,del}multi() functions should not.
  356  */
  357 extern struct mtx in_multi_mtx;
  358 #define IN_MULTI_LOCK()         mtx_lock(&in_multi_mtx)
  359 #define IN_MULTI_UNLOCK()       mtx_unlock(&in_multi_mtx)
  360 #define IN_MULTI_LOCK_ASSERT()  mtx_assert(&in_multi_mtx, MA_OWNED)
  361 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED)
  362 
  363 /*
  364  * Function for looking up an in_multi record for an IPv4 multicast address
  365  * on a given interface. ifp must be valid. If no record found, return NULL.
  366  * The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held.
  367  */
  368 static __inline struct in_multi *
  369 inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina)
  370 {
  371         struct ifmultiaddr *ifma;
  372         struct in_multi *inm;
  373 
  374         IN_MULTI_LOCK_ASSERT();
  375         IF_ADDR_LOCK_ASSERT(ifp);
  376 
  377         inm = NULL;
  378         TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) {
  379                 if (ifma->ifma_addr->sa_family == AF_INET) {
  380                         inm = (struct in_multi *)ifma->ifma_protospec;
  381                         if (inm->inm_addr.s_addr == ina.s_addr)
  382                                 break;
  383                         inm = NULL;
  384                 }
  385         }
  386         return (inm);
  387 }
  388 
  389 /*
  390  * Wrapper for inm_lookup_locked().
  391  * The IF_ADDR_LOCK will be taken on ifp and released on return.
  392  */
  393 static __inline struct in_multi *
  394 inm_lookup(struct ifnet *ifp, const struct in_addr ina)
  395 {
  396         struct in_multi *inm;
  397 
  398         IN_MULTI_LOCK_ASSERT();
  399         IF_ADDR_LOCK(ifp);
  400         inm = inm_lookup_locked(ifp, ina);
  401         IF_ADDR_UNLOCK(ifp);
  402 
  403         return (inm);
  404 }
  405 
  406 /* Acquire an in_multi record. */
  407 static __inline void
  408 inm_acquire_locked(struct in_multi *inm)
  409 {
  410 
  411         IN_MULTI_LOCK_ASSERT();
  412         ++inm->inm_refcount;
  413 }
  414 
  415 /*
  416  * Return values for imo_multi_filter().
  417  */
  418 #define MCAST_PASS              0       /* Pass */
  419 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
  420 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
  421 #define MCAST_MUTED             3       /* [deprecated] */
  422 
  423 struct  rtentry;
  424 struct  route;
  425 struct  ip_moptions;
  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 *);
  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 
  465 #if 0
  466 int      in_rt_getifa(struct rt_addrinfo *, u_int fibnum);
  467 int      in_rtioctl(u_long, caddr_t, u_int);
  468 int      in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int);
  469 #endif
  470 #endif /* _KERNEL */
  471 
  472 /* INET6 stuff */
  473 #include <netinet6/in6_var.h>
  474 
  475 #endif /* _NETINET_IN_VAR_H_ */

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