FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_pcb.h

     /*-
      * Copyright (c) 1982, 1986, 1990, 1993
      *      The Regents of the University of California.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)in_pcb.h    8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _NETINET_IN_PCB_H_
    #define _NETINET_IN_PCB_H_
    
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    #include <sys/_rwlock.h>
    
    #include <net/route.h>
    
    #ifdef _KERNEL
    #include <sys/rwlock.h>
    #endif
    
    #define in6pcb          inpcb   /* for KAME src sync over BSD*'s */
    #define in6p_sp         inp_sp  /* for KAME src sync over BSD*'s */
    struct inpcbpolicy;
    
    /*
     * struct inpcb is the common protocol control block structure used in most
     * IP transport protocols.
     *
     * Pointers to local and foreign host table entries, local and foreign socket
     * numbers, and pointers up (to a socket structure) and down (to a
     * protocol-specific control block) are stored here.
     */
    LIST_HEAD(inpcbhead, inpcb);
    LIST_HEAD(inpcbporthead, inpcbport);
    typedef u_quad_t        inp_gen_t;
    
    /*
     * PCB with AF_INET6 null bind'ed laddr can receive AF_INET input packet.
     * So, AF_INET6 null laddr is also used as AF_INET null laddr, by utilizing
     * the following structure.
     */
    struct in_addr_4in6 {
            u_int32_t       ia46_pad32[3];
            struct  in_addr ia46_addr4;
    };
    
    /*
     * NOTE: ipv6 addrs should be 64-bit aligned, per RFC 2553.  in_conninfo has
     * some extra padding to accomplish this.
     */
    struct in_endpoints {
            u_int16_t       ie_fport;               /* foreign port */
            u_int16_t       ie_lport;               /* local port */
            /* protocol dependent part, local and foreign addr */
            union {
                    /* foreign host table entry */
                    struct  in_addr_4in6 ie46_foreign;
                    struct  in6_addr ie6_foreign;
            } ie_dependfaddr;
            union {
                    /* local host table entry */
                    struct  in_addr_4in6 ie46_local;
                    struct  in6_addr ie6_local;
            } ie_dependladdr;
    };
    #define ie_faddr        ie_dependfaddr.ie46_foreign.ia46_addr4
    #define ie_laddr        ie_dependladdr.ie46_local.ia46_addr4
    #define ie6_faddr       ie_dependfaddr.ie6_foreign
    #define ie6_laddr       ie_dependladdr.ie6_local
    
    /*
     * XXX The defines for inc_* are hacks and should be changed to direct
    * references.
    */
   struct in_conninfo {
           u_int8_t        inc_flags;
           u_int8_t        inc_len;
           u_int16_t       inc_fibnum;     /* XXX was pad, 16 bits is plenty */
           /* protocol dependent part */
           struct  in_endpoints inc_ie;
   };
   #define inc_isipv6      inc_flags       /* temp compatability */
   #define inc_fport       inc_ie.ie_fport
   #define inc_lport       inc_ie.ie_lport
   #define inc_faddr       inc_ie.ie_faddr
   #define inc_laddr       inc_ie.ie_laddr
   #define inc6_faddr      inc_ie.ie6_faddr
   #define inc6_laddr      inc_ie.ie6_laddr
   
   struct  icmp6_filter;
   
   /*-
    * struct inpcb captures the network layer state for TCP, UDP, and raw IPv4
    * and IPv6 sockets.  In the case of TCP, further per-connection state is
    * hung off of inp_ppcb most of the time.  Almost all fields of struct inpcb
    * are static after creation or protected by a per-inpcb rwlock, inp_lock.  A
    * few fields also require the global pcbinfo lock for the inpcb to be held,
    * when modified, such as the global connection lists and hashes, as well as
    * binding information (which affects which hash a connection is on).  This
    * model means that connections can be looked up without holding the
    * per-connection lock, which is important for performance when attempting to
    * find the connection for a packet given its IP and port tuple.  Writing to
    * these fields that write locks be held on both the inpcb and global locks.
    *
    * Key:
    * (c) - Constant after initialization
    * (i) - Protected by the inpcb lock
    * (p) - Protected by the pcbinfo lock for the inpcb
    * (s) - Protected by another subsystem's locks
    * (x) - Undefined locking
    *
    * A few other notes:
    *
    * When a read lock is held, stability of the field is guaranteed; to write
    * to a field, a write lock must generally be held.
    *
    * netinet/netinet6-layer code should not assume that the inp_socket pointer
    * is safe to dereference without inp_lock being held, even for protocols
    * other than TCP (where the inpcb persists during TIMEWAIT even after the
    * socket has been freed), or there may be close(2)-related races.
    *
    * The inp_vflag field is overloaded, and would otherwise ideally be (c).
    */
   struct inpcb {
           LIST_ENTRY(inpcb) inp_hash;     /* (i/p) hash list */
           LIST_ENTRY(inpcb) inp_list;     /* (i/p) list for all PCBs for proto */
           void    *inp_ppcb;              /* (i) pointer to per-protocol pcb */
           struct  inpcbinfo *inp_pcbinfo; /* (c) PCB list info */
           struct  socket *inp_socket;     /* (i) back pointer to socket */
           u_int32_t inp_flow;             /* (i) IPv6 flow information */
           int     inp_flags;              /* (i) generic IP/datagram flags */
           u_char  inp_vflag;              /* (i) IP version flag (v4/v6) */
           u_char  inp_ip_ttl;             /* (i) time to live proto */
           u_char  inp_ip_p;               /* (c) protocol proto */
           u_char  inp_ip_minttl;          /* (i) minimum TTL or drop */
           uint32_t inp_ispare1;           /* (x) connection id / queue id */
           void    *inp_pspare;            /* (x) rtentry / general use */
           struct  ucred   *inp_cred;      /* (c) cache of socket cred */
   
           /* Local and foreign ports, local and foreign addr. */
           struct  in_conninfo inp_inc;    /* (i/p) list for PCB's local port */
   
           /* MAC and IPSEC policy information. */
           struct  label *inp_label;       /* (i) MAC label */
           struct  inpcbpolicy *inp_sp;    /* (s) for IPSEC */
   
           /* Protocol-dependent part; options. */
           struct {
                   u_char  inp4_ip_tos;            /* (i) type of service proto */
                   struct  mbuf *inp4_options;     /* (i) IP options */
                   struct  ip_moptions *inp4_moptions; /* (i) IP mcast options */
           } inp_depend4;
           struct {
                   /* (i) IP options */
                   struct  mbuf *inp6_options;
                   /* (i) IP6 options for outgoing packets */
                   struct  ip6_pktopts *inp6_outputopts;
                   /* (i) IP multicast options */
                   struct  ip6_moptions *inp6_moptions;
                   /* (i) ICMPv6 code type filter */
                   struct  icmp6_filter *inp6_icmp6filt;
                   /* (i) IPV6_CHECKSUM setsockopt */
                   int     inp6_cksum;
                   short   inp6_hops;
           } inp_depend6;
           LIST_ENTRY(inpcb) inp_portlist; /* (i/p) */
           struct  inpcbport *inp_phd;     /* (i/p) head of this list */
   #define inp_zero_size offsetof(struct inpcb, inp_gencnt)
           inp_gen_t       inp_gencnt;     /* (c) generation count */
           struct rwlock   inp_lock;
   };
   #define inp_fport       inp_inc.inc_fport
   #define inp_lport       inp_inc.inc_lport
   #define inp_faddr       inp_inc.inc_faddr
   #define inp_laddr       inp_inc.inc_laddr
   #define inp_ip_tos      inp_depend4.inp4_ip_tos
   #define inp_options     inp_depend4.inp4_options
   #define inp_moptions    inp_depend4.inp4_moptions
   
   #define in6p_faddr      inp_inc.inc6_faddr
   #define in6p_laddr      inp_inc.inc6_laddr
   #define in6p_hops       inp_depend6.inp6_hops   /* default hop limit */
   #define in6p_ip6_nxt    inp_ip_p
   #define in6p_flowinfo   inp_flow
   #define in6p_vflag      inp_vflag
   #define in6p_options    inp_depend6.inp6_options
   #define in6p_outputopts inp_depend6.inp6_outputopts
   #define in6p_moptions   inp_depend6.inp6_moptions
   #define in6p_icmp6filt  inp_depend6.inp6_icmp6filt
   #define in6p_cksum      inp_depend6.inp6_cksum
   #define in6p_flags      inp_flags  /* for KAME src sync over BSD*'s */
   #define in6p_socket     inp_socket  /* for KAME src sync over BSD*'s */
   #define in6p_lport      inp_lport  /* for KAME src sync over BSD*'s */
   #define in6p_fport      inp_fport  /* for KAME src sync over BSD*'s */
   #define in6p_ppcb       inp_ppcb  /* for KAME src sync over BSD*'s */
   
   /*
    * The range of the generation count, as used in this implementation, is 9e19.
    * We would have to create 300 billion connections per second for this number
    * to roll over in a year.  This seems sufficiently unlikely that we simply
    * don't concern ourselves with that possibility.
    */
   
   /*
    * Interface exported to userland by various protocols which use inpcbs.  Hack
    * alert -- only define if struct xsocket is in scope.
    */
   #ifdef _SYS_SOCKETVAR_H_
   struct  xinpcb {
           size_t  xi_len;         /* length of this structure */
           struct  inpcb xi_inp;
           struct  xsocket xi_socket;
           u_quad_t        xi_alignment_hack;
   };
   
   struct  xinpgen {
           size_t  xig_len;        /* length of this structure */
           u_int   xig_count;      /* number of PCBs at this time */
           inp_gen_t xig_gen;      /* generation count at this time */
           so_gen_t xig_sogen;     /* socket generation count at this time */
   };
   #endif /* _SYS_SOCKETVAR_H_ */
   
   struct inpcbport {
           LIST_ENTRY(inpcbport) phd_hash;
           struct inpcbhead phd_pcblist;
           u_short phd_port;
   };
   
   /*
    * Global data structure for each high-level protocol (UDP, TCP, ...) in both
    * IPv4 and IPv6.  Holds inpcb lists and information for managing them.
    */
   struct inpcbinfo {
           /*
            * Global list of inpcbs on the protocol.
            */
           struct inpcbhead        *ipi_listhead;
           u_int                    ipi_count;
   
           /*
            * Global hash of inpcbs, hashed by local and foreign addresses and
            * port numbers.
            */
           struct inpcbhead        *ipi_hashbase;
           u_long                   ipi_hashmask;
   
           /*
            * Global hash of inpcbs, hashed by only local port number.
            */
           struct inpcbporthead    *ipi_porthashbase;
           u_long                   ipi_porthashmask;
   
           /*
            * Fields associated with port lookup and allocation.
            */
           u_short                  ipi_lastport;
           u_short                  ipi_lastlow;
           u_short                  ipi_lasthi;
   
           /*
            * UMA zone from which inpcbs are allocated for this protocol.
            */
           struct  uma_zone        *ipi_zone;
   
           /*
            * Generation count--incremented each time a connection is allocated
            * or freed.
            */
           u_quad_t                 ipi_gencnt;
           struct rwlock            ipi_lock;
   
           /*
            * vimage 1
            * general use 1
            */
           void                    *ipi_pspare[2];
   };
   
   #define INP_LOCK_INIT(inp, d, t) \
           rw_init_flags(&(inp)->inp_lock, (t), RW_RECURSE |  RW_DUPOK)
   #define INP_LOCK_DESTROY(inp)   rw_destroy(&(inp)->inp_lock)
   #define INP_RLOCK(inp)          rw_rlock(&(inp)->inp_lock)
   #define INP_WLOCK(inp)          rw_wlock(&(inp)->inp_lock)
   #define INP_TRY_RLOCK(inp)      rw_try_rlock(&(inp)->inp_lock)
   #define INP_TRY_WLOCK(inp)      rw_try_wlock(&(inp)->inp_lock)
   #define INP_RUNLOCK(inp)        rw_runlock(&(inp)->inp_lock)
   #define INP_WUNLOCK(inp)        rw_wunlock(&(inp)->inp_lock)
   #define INP_LOCK_ASSERT(inp)    rw_assert(&(inp)->inp_lock, RA_LOCKED)
   #define INP_RLOCK_ASSERT(inp)   rw_assert(&(inp)->inp_lock, RA_RLOCKED)
   #define INP_WLOCK_ASSERT(inp)   rw_assert(&(inp)->inp_lock, RA_WLOCKED)
   #define INP_UNLOCK_ASSERT(inp)  rw_assert(&(inp)->inp_lock, RA_UNLOCKED)
   
   #ifdef _KERNEL
   /*
    * These locking functions are for inpcb consumers outside of sys/netinet,
    * more specifically, they were added for the benefit of TOE drivers. The
    * macros are reserved for use by the stack.
    */
   void inp_wlock(struct inpcb *);
   void inp_wunlock(struct inpcb *);
   void inp_rlock(struct inpcb *);
   void inp_runlock(struct inpcb *);
   
   #ifdef INVARIANTS
   void inp_lock_assert(struct inpcb *);
   void inp_unlock_assert(struct inpcb *);
   void inp_wlock_assert(struct inpcb *);
   void inp_wunlock_assert(struct inpcb *);
   void inp_rlock_assert(struct inpcb *);
   void inp_runlock_assert(struct inpcb *);
   
   #else
   static __inline void
   inp_lock_assert(struct inpcb *inp __unused)
   {
   }
   
   static __inline void
   inp_unlock_assert(struct inpcb *inp __unused)
   {
   }
   
   static __inline void
   inp_wlock_assert(struct inpcb *inp __unused)
   {
   }
   
   static __inline void
   inp_wunlock_assert(struct inpcb *inp __unused)
   {
   }
   
   static __inline void
   inp_rlock_assert(struct inpcb *inp __unused)
   {
   }
   
   static __inline void
   inp_runlock_assert(struct inpcb *inp __unused)
   {
   }
   
   
   #endif
   
   void    inp_apply_all(void (*func)(struct inpcb *, void *), void *arg);
   int     inp_ip_tos_get(const struct inpcb *inp);
   void    inp_ip_tos_set(struct inpcb *inp, int val);
   struct socket *
           inp_inpcbtosocket(struct inpcb *inp);
   struct tcpcb *
           inp_inpcbtotcpcb(struct inpcb *inp);
   void    inp_4tuple_get(struct inpcb *inp, uint32_t *laddr, uint16_t *lp,
                   uint32_t *faddr, uint16_t *fp);
   
   #endif /* _KERNEL */
   
   #define INP_INFO_LOCK_INIT(ipi, d) \
           rw_init_flags(&(ipi)->ipi_lock, (d), RW_RECURSE)
   #define INP_INFO_LOCK_DESTROY(ipi)  rw_destroy(&(ipi)->ipi_lock)
   #define INP_INFO_RLOCK(ipi)     rw_rlock(&(ipi)->ipi_lock)
   #define INP_INFO_WLOCK(ipi)     rw_wlock(&(ipi)->ipi_lock)
   #define INP_INFO_TRY_RLOCK(ipi) rw_try_rlock(&(ipi)->ipi_lock)
   #define INP_INFO_TRY_WLOCK(ipi) rw_try_wlock(&(ipi)->ipi_lock)
   #define INP_INFO_RUNLOCK(ipi)   rw_runlock(&(ipi)->ipi_lock)
   #define INP_INFO_WUNLOCK(ipi)   rw_wunlock(&(ipi)->ipi_lock)
   #define INP_INFO_LOCK_ASSERT(ipi)       rw_assert(&(ipi)->ipi_lock, RA_LOCKED)
   #define INP_INFO_RLOCK_ASSERT(ipi)      rw_assert(&(ipi)->ipi_lock, RA_RLOCKED)
   #define INP_INFO_WLOCK_ASSERT(ipi)      rw_assert(&(ipi)->ipi_lock, RA_WLOCKED)
   #define INP_INFO_UNLOCK_ASSERT(ipi)     rw_assert(&(ipi)->ipi_lock, RA_UNLOCKED)
   
   #define INP_PCBHASH(faddr, lport, fport, mask) \
           (((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
   #define INP_PCBPORTHASH(lport, mask) \
           (ntohs((lport)) & (mask))
   
   /*
    * Flags for inp_vflags -- historically version flags only, but now quite a
    * bit more due to an overflow of inp_flag, leading to some locking ambiguity
    * as some bits are stable from initial allocation, and others may change.
    */
   #define INP_IPV4        0x1
   #define INP_IPV6        0x2
   #define INP_IPV6PROTO   0x4             /* opened under IPv6 protocol */
   #define INP_TIMEWAIT    0x8             /* inpcb in TIMEWAIT, ppcb is tcptw */
   #define INP_ONESBCAST   0x10            /* send all-ones broadcast */
   #define INP_DROPPED     0x20            /* protocol drop flag */
   #define INP_SOCKREF     0x40            /* strong socket reference */
   
   /*
    * Flags for inp_flag.
    */
   #define INP_RECVOPTS            0x01    /* receive incoming IP options */
   #define INP_RECVRETOPTS         0x02    /* receive IP options for reply */
   #define INP_RECVDSTADDR         0x04    /* receive IP dst address */
   #define INP_HDRINCL             0x08    /* user supplies entire IP header */
   #define INP_HIGHPORT            0x10    /* user wants "high" port binding */
   #define INP_LOWPORT             0x20    /* user wants "low" port binding */
   #define INP_ANONPORT            0x40    /* port chosen for user */
   #define INP_RECVIF              0x80    /* receive incoming interface */
   #define INP_MTUDISC             0x100   /* user can do MTU discovery */
   #define INP_FAITH               0x200   /* accept FAITH'ed connections */
   #define INP_RECVTTL             0x400   /* receive incoming IP TTL */
   #define INP_DONTFRAG            0x800   /* don't fragment packet */
   
   #define IN6P_IPV6_V6ONLY        0x008000 /* restrict AF_INET6 socket for v6 */
   
   #define IN6P_PKTINFO            0x010000 /* receive IP6 dst and I/F */
   #define IN6P_HOPLIMIT           0x020000 /* receive hoplimit */
   #define IN6P_HOPOPTS            0x040000 /* receive hop-by-hop options */
   #define IN6P_DSTOPTS            0x080000 /* receive dst options after rthdr */
   #define IN6P_RTHDR              0x100000 /* receive routing header */
   #define IN6P_RTHDRDSTOPTS       0x200000 /* receive dstoptions before rthdr */
   #define IN6P_TCLASS             0x400000 /* receive traffic class value */
   #define IN6P_AUTOFLOWLABEL      0x800000 /* attach flowlabel automatically */
   #define IN6P_RFC2292            0x40000000 /* used RFC2292 API on the socket */
   #define IN6P_MTU                0x80000000 /* receive path MTU */
   
   #define INP_CONTROLOPTS         (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
                                    INP_RECVIF|INP_RECVTTL|\
                                    IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
                                    IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
                                    IN6P_TCLASS|IN6P_AUTOFLOWLABEL|IN6P_RFC2292|\
                                    IN6P_MTU)
   #define INP_UNMAPPABLEOPTS      (IN6P_HOPOPTS|IN6P_DSTOPTS|IN6P_RTHDR|\
                                    IN6P_TCLASS|IN6P_AUTOFLOWLABEL)
   
    /* for KAME src sync over BSD*'s */
   #define IN6P_HIGHPORT           INP_HIGHPORT
   #define IN6P_LOWPORT            INP_LOWPORT
   #define IN6P_ANONPORT           INP_ANONPORT
   #define IN6P_RECVIF             INP_RECVIF
   #define IN6P_MTUDISC            INP_MTUDISC
   #define IN6P_FAITH              INP_FAITH
   #define IN6P_CONTROLOPTS INP_CONTROLOPTS
           /*
            * socket AF version is {newer than,or include}
            * actual datagram AF version
            */
   
   #define INPLOOKUP_WILDCARD      1
   #define sotoinpcb(so)   ((struct inpcb *)(so)->so_pcb)
   #define sotoin6pcb(so)  sotoinpcb(so) /* for KAME src sync over BSD*'s */
   
   #define INP_SOCKAF(so) so->so_proto->pr_domain->dom_family
   
   #define INP_CHECK_SOCKAF(so, af)        (INP_SOCKAF(so) == af)
   
   #ifdef _KERNEL
   extern int      ipport_reservedhigh;
   extern int      ipport_reservedlow;
   extern int      ipport_lowfirstauto;
   extern int      ipport_lowlastauto;
   extern int      ipport_firstauto;
   extern int      ipport_lastauto;
   extern int      ipport_hifirstauto;
   extern int      ipport_hilastauto;
   extern struct callout ipport_tick_callout;
   
   void    in_pcbpurgeif0(struct inpcbinfo *, struct ifnet *);
   int     in_pcballoc(struct socket *, struct inpcbinfo *);
   int     in_pcbbind(struct inpcb *, struct sockaddr *, struct ucred *);
   int     in_pcbbind_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
               u_short *, struct ucred *);
   int     in_pcbconnect(struct inpcb *, struct sockaddr *, struct ucred *);
   int     in_pcbconnect_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
               u_short *, in_addr_t *, u_short *, struct inpcb **,
               struct ucred *);
   void    in_pcbdetach(struct inpcb *);
   void    in_pcbdisconnect(struct inpcb *);
   void    in_pcbdrop(struct inpcb *);
   void    in_pcbfree(struct inpcb *);
   int     in_pcbinshash(struct inpcb *);
   struct inpcb *
           in_pcblookup_local(struct inpcbinfo *,
               struct in_addr, u_short, int, struct ucred *);
   struct inpcb *
           in_pcblookup_hash(struct inpcbinfo *, struct in_addr, u_int,
               struct in_addr, u_int, int, struct ifnet *);
   void    in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr,
               int, struct inpcb *(*)(struct inpcb *, int));
   void    in_pcbrehash(struct inpcb *);
   void    in_pcbsetsolabel(struct socket *so);
   int     in_getpeeraddr(struct socket *so, struct sockaddr **nam);
   int     in_getsockaddr(struct socket *so, struct sockaddr **nam);
   struct sockaddr *
           in_sockaddr(in_port_t port, struct in_addr *addr);
   void    in_pcbsosetlabel(struct socket *so);
   void    in_pcbremlists(struct inpcb *inp);
   void    ipport_tick(void *xtp);
   
   /*
    * Debugging routines compiled in when DDB is present.
    */
   void    db_print_inpcb(struct inpcb *inp, const char *name, int indent);
   
   #endif /* _KERNEL */
   
   #endif /* !_NETINET_IN_PCB_H_ */

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