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

     /*-
      * 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.
     * 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.
     *
     *      @(#)ip_var.h    8.2 (Berkeley) 1/9/95
     * $FreeBSD: releng/8.0/sys/netinet/ip_var.h 196039 2009-08-02 19:43:32Z rwatson $
     */
    
    #ifndef _NETINET_IP_VAR_H_
    #define _NETINET_IP_VAR_H_
    
    #include <sys/queue.h>
    
    /*
     * Overlay for ip header used by other protocols (tcp, udp).
     */
    struct ipovly {
            u_char  ih_x1[9];               /* (unused) */
            u_char  ih_pr;                  /* protocol */
            u_short ih_len;                 /* protocol length */
            struct  in_addr ih_src;         /* source internet address */
            struct  in_addr ih_dst;         /* destination internet address */
    };
    
    #ifdef _KERNEL
    /*
     * 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 {
            TAILQ_ENTRY(ipq) ipq_list;      /* to other reass headers */
            u_char  ipq_ttl;                /* time for reass q to live */
            u_char  ipq_p;                  /* protocol of this fragment */
            u_short ipq_id;                 /* sequence id for reassembly */
            struct mbuf *ipq_frags;         /* to ip headers of fragments */
            struct  in_addr ipq_src,ipq_dst;
            u_char  ipq_nfrags;             /* # frags in this packet */
            struct label *ipq_label;        /* MAC label */
    };
    #endif /* _KERNEL */
    
    /*
     * 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 */
            char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
    };
    
    /*
     * Structure attached to inpcb.ip_moptions and
     * passed to ip_output when IP multicast options are in use.
     * This structure is lazy-allocated.
     */
    struct ip_moptions {
            struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
            struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
            u_long  imo_multicast_vif;      /* vif num outgoing multicasts */
            u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
            u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
            u_short imo_num_memberships;    /* no. memberships this socket */
            u_short imo_max_memberships;    /* max memberships this socket */
            struct  in_multi **imo_membership;      /* group memberships */
            struct  in_mfilter *imo_mfilters;       /* source filters */
    };
    
    struct  ipstat {
            u_long  ips_total;              /* total packets received */
           u_long  ips_badsum;             /* checksum bad */
           u_long  ips_tooshort;           /* packet too short */
           u_long  ips_toosmall;           /* not enough data */
           u_long  ips_badhlen;            /* ip header length < data size */
           u_long  ips_badlen;             /* ip length < ip header length */
           u_long  ips_fragments;          /* fragments received */
           u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
           u_long  ips_fragtimeout;        /* fragments timed out */
           u_long  ips_forward;            /* packets forwarded */
           u_long  ips_fastforward;        /* packets fast forwarded */
           u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
           u_long  ips_redirectsent;       /* packets forwarded on same net */
           u_long  ips_noproto;            /* unknown or unsupported protocol */
           u_long  ips_delivered;          /* datagrams delivered to upper level*/
           u_long  ips_localout;           /* total ip packets generated here */
           u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
           u_long  ips_reassembled;        /* total packets reassembled ok */
           u_long  ips_fragmented;         /* datagrams successfully fragmented */
           u_long  ips_ofragments;         /* output fragments created */
           u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
           u_long  ips_badoptions;         /* error in option processing */
           u_long  ips_noroute;            /* packets discarded due to no route */
           u_long  ips_badvers;            /* ip version != 4 */
           u_long  ips_rawout;             /* total raw ip packets generated */
           u_long  ips_toolong;            /* ip length > max ip packet size */
           u_long  ips_notmember;          /* multicasts for unregistered grps */
           u_long  ips_nogif;              /* no match gif found */
           u_long  ips_badaddr;            /* invalid address on header */
   };
   
   #ifdef _KERNEL
   
   #include <net/vnet.h>
   
   /*
    * In-kernel consumers can use these accessor macros directly to update
    * stats.
    */
   #define IPSTAT_ADD(name, val)   V_ipstat.name += (val)
   #define IPSTAT_SUB(name, val)   V_ipstat.name -= (val)
   #define IPSTAT_INC(name)        IPSTAT_ADD(name, 1)
   #define IPSTAT_DEC(name)        IPSTAT_SUB(name, 1)
   
   /*
    * Kernel module consumers must use this accessor macro.
    */
   void    kmod_ipstat_inc(int statnum);
   #define KMOD_IPSTAT_INC(name)                                           \
           kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(u_long))
   void    kmod_ipstat_dec(int statnum);
   #define KMOD_IPSTAT_DEC(name)                                           \
           kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(u_long))
   
   /* 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_SENDONES             0x4             /* send all-ones broadcast */
   #define IP_SENDTOIF             0x8             /* send on specific ifnet */
   #define IP_ROUTETOIF            SO_DONTROUTE    /* 0x10 bypass routing tables */
   #define IP_ALLOWBROADCAST       SO_BROADCAST    /* 0x20 can send broadcast packets */
   
   /*
    * mbuf flag used by ip_fastfwd
    */
   #define M_FASTFWD_OURS          M_PROTO1        /* changed dst to local */
   
   #ifdef __NO_STRICT_ALIGNMENT
   #define IP_HDR_ALIGNED_P(ip)    1
   #else
   #define IP_HDR_ALIGNED_P(ip)    ((((intptr_t) (ip)) & 3) == 0)
   #endif
   
   struct ip;
   struct inpcb;
   struct route;
   struct sockopt;
   
   VNET_DECLARE(struct ipstat, ipstat);
   VNET_DECLARE(u_short, ip_id);                   /* ip packet ctr, for ids */
   VNET_DECLARE(int, ip_defttl);                   /* default IP ttl */
   VNET_DECLARE(int, ipforwarding);                /* ip forwarding */
   #ifdef IPSTEALTH
   VNET_DECLARE(int, ipstealth);                   /* stealth forwarding */
   #endif
   VNET_DECLARE(int, rsvp_on);
   VNET_DECLARE(struct socket *, ip_rsvpd);        /* reservation protocol daemon*/
   VNET_DECLARE(struct socket *, ip_mrouter);      /* multicast routing daemon */
   
   #define V_ipstat                VNET(ipstat)
   #define V_ip_id                 VNET(ip_id)
   #define V_ip_defttl             VNET(ip_defttl)
   #define V_ipforwarding          VNET(ipforwarding)
   #ifdef IPSTEALTH
   #define V_ipstealth             VNET(ipstealth)
   #endif
   #define V_rsvp_on               VNET(rsvp_on)
   #define V_ip_rsvpd              VNET(ip_rsvpd)
   #define V_ip_mrouter            VNET(ip_mrouter)
   
   extern u_char   ip_protox[];
   extern int      (*legal_vif_num)(int);
   extern u_long   (*ip_mcast_src)(int);
   extern struct   pr_usrreqs rip_usrreqs;
   
   void    inp_freemoptions(struct ip_moptions *);
   int     inp_getmoptions(struct inpcb *, struct sockopt *);
   int     inp_setmoptions(struct inpcb *, struct sockopt *);
   
   int     ip_ctloutput(struct socket *, struct sockopt *sopt);
   void    ip_drain(void);
   void    ip_fini(void *xtp);
   int     ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
               u_long if_hwassist_flags, int sw_csum);
   void    ip_forward(struct mbuf *m, int srcrt);
   void    ip_init(void);
   extern int
           (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
               struct ip_moptions *);
   int     ip_output(struct mbuf *,
               struct mbuf *, struct route *, int, struct ip_moptions *,
               struct inpcb *);
   int     ipproto_register(u_char);
   int     ipproto_unregister(u_char);
   struct mbuf *
           ip_reass(struct mbuf *);
   struct in_ifaddr *
           ip_rtaddr(struct in_addr, u_int fibnum);
   void    ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
               struct mbuf *);
   void    ip_slowtimo(void);
   u_int16_t       ip_randomid(void);
   int     rip_ctloutput(struct socket *, struct sockopt *);
   void    rip_ctlinput(int, struct sockaddr *, void *);
   void    rip_init(void);
   #ifdef VIMAGE
   void    rip_destroy(void);
   #endif
   void    rip_input(struct mbuf *, int);
   int     rip_output(struct mbuf *, struct socket *, u_long);
   void    ipip_input(struct mbuf *, int);
   void    rsvp_input(struct mbuf *, int);
   int     ip_rsvp_init(struct socket *);
   int     ip_rsvp_done(void);
   extern int      (*ip_rsvp_vif)(struct socket *, struct sockopt *);
   extern void     (*ip_rsvp_force_done)(struct socket *);
   extern void     (*rsvp_input_p)(struct mbuf *m, int off);
   
   extern  struct pfil_head inet_pfil_hook;        /* packet filter hooks */
   
   void    in_delayed_cksum(struct mbuf *m);
   
   /* ipfw and dummynet hooks. Most are declared in raw_ip.c */
   struct ip_fw_args;
   extern int      (*ip_fw_chk_ptr)(struct ip_fw_args *args);
   extern int      (*ip_fw_ctl_ptr)(struct sockopt *);
   extern int      (*ip_dn_ctl_ptr)(struct sockopt *);
   extern int      (*ip_dn_io_ptr)(struct mbuf **m, int dir, struct ip_fw_args *fwa);
   extern void     (*ip_dn_ruledel_ptr)(void *);           /* in ip_fw2.c */
   
   VNET_DECLARE(int, ip_do_randomid);
   #define V_ip_do_randomid        VNET(ip_do_randomid)
   #define ip_newid()      ((V_ip_do_randomid != 0) ? ip_randomid() : \
                               htons(V_ip_id++))
   
   #endif /* _KERNEL */
   
   #endif /* !_NETINET_IP_VAR_H_ */

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