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

     /*      $NetBSD: ip_var.h,v 1.90 2008/10/12 11:15:54 plunky Exp $       */
     
     /*
      * Copyright (c) 1982, 1986, 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.
     * 3. 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.
     *
     *      @(#)ip_var.h    8.2 (Berkeley) 1/9/95
     */
    
    #ifndef _NETINET_IP_VAR_H_
    #define _NETINET_IP_VAR_H_
    
    #include <sys/queue.h>
    #include <net/route.h>
    
    /*
     * Overlay for ip header used by other protocols (tcp, udp).
     */
    struct ipovly {
            u_int8_t  ih_x1[9];             /* (unused) */
            u_int8_t  ih_pr;                /* protocol */
            u_int16_t ih_len;               /* protocol length */
            struct    in_addr ih_src;       /* source internet address */
            struct    in_addr ih_dst;       /* destination internet address */
    } __packed;
    
    /*
     * Ip (reassembly or sequence) queue structures.
     *
     * XXX -- The following explains why the ipqe_m field is here, for TCP's use:
     * We want to avoid doing m_pullup on incoming packets but that
     * means avoiding dtom on the tcp reassembly code.  That in turn means
     * keeping an mbuf pointer in the reassembly queue (since we might
     * have a cluster).  As a quick hack, the source & destination
     * port numbers (which are no longer needed once we've located the
     * tcpcb) are overlayed with an mbuf pointer.
     */
    TAILQ_HEAD(ipqehead, ipqent);
    struct ipqent {
            TAILQ_ENTRY(ipqent) ipqe_q;
            union {
                    struct ip       *_ip;
                    struct tcpiphdr *_tcp;
            } _ipqe_u1;
            struct mbuf     *ipqe_m;        /* point to first mbuf */
            struct mbuf     *ipre_mlast;    /* point to last mbuf */
            u_int8_t        ipqe_mff;       /* for IP fragmentation */
            /*
             * The following are used in TCP reassembly
             */
            TAILQ_ENTRY(ipqent) ipqe_timeq;
            u_int32_t ipqe_seq;
            u_int32_t ipqe_len;
            u_int32_t ipqe_flags;
    };
    #define ipqe_ip         _ipqe_u1._ip
    #define ipqe_tcp        _ipqe_u1._tcp
    
    /*
     * Ip reassembly queue structure.  Each fragment
     * being reassembled is attached to one of these structures.
     * They are timed out after ipq_ttl drops to 0, and may also
     * be reclaimed if memory becomes tight.
     */
    struct ipq {
            LIST_ENTRY(ipq) ipq_q;          /* to other reass headers */
            u_int8_t  ipq_ttl;              /* time for reass q to live */
            u_int8_t  ipq_p;                /* protocol of this fragment */
            u_int16_t ipq_id;               /* sequence id for reassembly */
            struct    ipqehead ipq_fragq;   /* to ip fragment queue */
            struct    in_addr ipq_src, ipq_dst;
            u_int16_t ipq_nfrags;           /* frags in this queue entry */
            u_int8_t  ipq_tos;              /* TOS of this fragment */
    };
    
   /*
    * Structure stored in mbuf in inpcb.ip_options
    * and passed to ip_output when ip options are in use.
    * The actual length of the options (including ipopt_dst)
    * is in m_len.
    */
   #define MAX_IPOPTLEN    40
   
   struct ipoption {
           struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
           int8_t  ipopt_list[MAX_IPOPTLEN];       /* options proper */
   };
   
   /*
    * Structure attached to inpcb.ip_moptions and
    * passed to ip_output when IP multicast options are in use.
    */
   struct ip_moptions {
           struct    ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
           struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
           u_int8_t  imo_multicast_ttl;    /* TTL for outgoing multicasts */
           u_int8_t  imo_multicast_loop;   /* 1 => hear sends if a member */
           u_int16_t imo_num_memberships;  /* no. memberships this socket */
           struct    in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
   };
   
   /*
    * IP statistics.
    * Each counter is an unsigned 64-bit value.
    */
   #define IP_STAT_TOTAL           0       /* total packets received */
   #define IP_STAT_BADSUM          1       /* checksum bad */
   #define IP_STAT_TOOSHORT        2       /* packet too short */
   #define IP_STAT_TOOSMALL        3       /* not enough data */
   #define IP_STAT_BADHLEN         4       /* ip header length < data size */
   #define IP_STAT_BADLEN          5       /* ip length < ip header length */
   #define IP_STAT_FRAGMENTS       6       /* fragments received */
   #define IP_STAT_FRAGDROPPED     7       /* frags dropped (dups, out of space) */
   #define IP_STAT_FRAGTIMEOUT     8       /* fragments timed out */
   #define IP_STAT_FORWARD         9       /* packets forwarded */
   #define IP_STAT_FASTFORWARD     10      /* packets fast forwarded */
   #define IP_STAT_CANTFORWARD     11      /* packets rcvd for unreachable dest */
   #define IP_STAT_REDIRECTSENT    12      /* packets forwareded on same net */
   #define IP_STAT_NOPROTO         13      /* unknown or unsupported protocol */
   #define IP_STAT_DELIVERED       14      /* datagrams delivered to upper level */
   #define IP_STAT_LOCALOUT        15      /* total ip packets generated here */
   #define IP_STAT_ODROPPED        16      /* lost packets due to nobufs, etc. */
   #define IP_STAT_REASSEMBLED     17      /* total packets reassembled ok */
   #define IP_STAT_FRAGMENTED      18      /* datagrams successfully fragmented */
   #define IP_STAT_OFRAGMENTS      19      /* output fragments created */
   #define IP_STAT_CANTFRAG        20      /* don't fragment flag was set, etc. */
   #define IP_STAT_BADOPTIONS      21      /* error in option processing */
   #define IP_STAT_NOROUTE         22      /* packets discarded due to no route */
   #define IP_STAT_BADVERS         23      /* ip version != 4 */
   #define IP_STAT_RAWOUT          24      /* total raw ip packets generated */
   #define IP_STAT_BADFRAGS        25      /* malformed fragments (bad length) */
   #define IP_STAT_RCVMEMDROP      26      /* frags dropped for lack of memory */
   #define IP_STAT_TOOLONG         27      /* ip length > max ip packet size */
   #define IP_STAT_NOGIF           28      /* no match gif found */
   #define IP_STAT_BADADDR         29      /* invalid address on header */
   
   #define IP_NSTATS               30
   
   #ifdef _KERNEL
   
   #ifdef _KERNEL_OPT
   #include "opt_gateway.h"
   #include "opt_mbuftrace.h"
   #endif
   
   /* flags passed to ip_output as last parameter */
   #define IP_FORWARDING           0x1             /* most of ip header exists */
   #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
   #define IP_RETURNMTU            0x4             /* pass back mtu on EMSGSIZE */
   #define IP_NOIPNEWID            0x8             /* don't fill in ip_id */
   #define IP_ROUTETOIF            SO_DONTROUTE    /* bypass routing tables */
   #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
   #define IP_MTUDISC              0x0400          /* Path MTU Discovery; set DF */
   
   extern struct domain inetdomain;
   
   extern LIST_HEAD(ipqhead, ipq) ipq[];   /* ip reass. queue */
   extern int   ip_defttl;                 /* default IP ttl */
   extern int   ipforwarding;              /* ip forwarding */
   extern int   ip_mtudisc;                /* mtu discovery */
   extern int   ip_mtudisc_timeout;        /* seconds to timeout mtu discovery */
   extern int   anonportmin;               /* minimum ephemeral port */
   extern int   anonportmax;               /* maximum ephemeral port */
   extern int   lowportmin;                /* minimum reserved port */
   extern int   lowportmax;                /* maximum reserved port */
   extern int   ip_do_loopback_cksum;      /* do IP checksum on loopback? */
   extern struct rttimer_queue *ip_mtudisc_timeout_q;
   #ifdef MBUFTRACE
   extern struct mowner ip_rx_mowner;
   extern struct mowner ip_tx_mowner;
   #endif
   #ifdef GATEWAY
   extern int ip_maxflows;
   extern int ip_hashsize;
   #endif
   extern struct pool inmulti_pool;
   extern struct pool ipqent_pool;
   struct   inpcb;
   struct   sockopt;
   
   int      ip_ctloutput(int, struct socket *, struct sockopt *);
   int      ip_dooptions(struct mbuf *);
   void     ip_drain(void);
   void     ip_forward(struct mbuf *, int);
   void     ip_freef(struct ipq *);
   void     ip_freemoptions(struct ip_moptions *);
   int      ip_getmoptions(struct ip_moptions *, struct sockopt *);
   void     ip_init(void);
   int      ip_optcopy(struct ip *, struct ip *);
   u_int    ip_optlen(struct inpcb *);
   int      ip_output(struct mbuf *, ...);
   int      ip_fragment(struct mbuf *, struct ifnet *, u_long);
   int      ip_pcbopts(struct mbuf **, const struct sockopt *);
   struct mbuf *
            ip_reass(struct ipqent *, struct ipq *, struct ipqhead *);
   struct in_ifaddr *
            ip_rtaddr(struct in_addr);
   void     ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
              struct mbuf *);
   int      ip_setmoptions(struct ip_moptions **, const struct sockopt *);
   void     ip_slowtimo(void);
   struct mbuf *
            ip_srcroute(void);
   int      ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
   void     ip_statinc(u_int);
   void     ipintr(void);
   void *   rip_ctlinput(int, const struct sockaddr *, void *);
   int      rip_ctloutput(int, struct socket *, struct sockopt *);
   void     rip_init(void);
   void     rip_input(struct mbuf *, ...);
   int      rip_output(struct mbuf *, ...);
   int      rip_usrreq(struct socket *,
               int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
   int     ipflow_init(int);
   void    ipflow_prune(void);
   void    ipflow_create(const struct route *, struct mbuf *);
   void    ipflow_slowtimo(void);
   int     ipflow_invalidate_all(int);
   
   #endif  /* _KERNEL */
   
   #endif /* !_NETINET_IP_VAR_H_ */

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