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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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
     * $FreeBSD$
     */
    
    #ifndef _NETINET_IP_VAR_H_
    #define _NETINET_IP_VAR_H_
    
    #include <sys/epoch.h>
    #include <sys/queue.h>
    #include <sys/types.h>
    
    #include <netinet/in.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 net.inet.ip.fragttl seconds, and may also be
     * reclaimed if memory becomes tight.
     */
    struct ipq {
            TAILQ_ENTRY(ipq) ipq_list;      /* to other reass headers */
            time_t  ipq_expire;             /* time_uptime when ipq expires */
            u_char  ipq_nfrags;             /* # frags in this packet */
            u_char  ipq_p;                  /* protocol of this fragment */
            u_short ipq_id;                 /* sequence id for reassembly */
            int     ipq_maxoff;             /* total length of packet */
            struct mbuf *ipq_frags;         /* to ip headers of fragments */
            struct  in_addr ipq_src,ipq_dst;
            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 */
    };
    
    #if defined(_NETINET_IN_VAR_H_) && defined(_KERNEL)
    /*
     * 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 */
           struct ip_mfilter_head imo_head; /* group membership list */
   };
   #else
   struct ip_moptions;
   #endif
   
   struct  ipstat {
           uint64_t ips_total;             /* total packets received */
           uint64_t ips_badsum;            /* checksum bad */
           uint64_t ips_tooshort;          /* packet too short */
           uint64_t ips_toosmall;          /* not enough data */
           uint64_t ips_badhlen;           /* ip header length < data size */
           uint64_t ips_badlen;            /* ip length < ip header length */
           uint64_t ips_fragments;         /* fragments received */
           uint64_t ips_fragdropped;       /* frags dropped (dups, out of space) */
           uint64_t ips_fragtimeout;       /* fragments timed out */
           uint64_t ips_forward;           /* packets forwarded */
           uint64_t ips_fastforward;       /* packets fast forwarded */
           uint64_t ips_cantforward;       /* packets rcvd for unreachable dest */
           uint64_t ips_redirectsent;      /* packets forwarded on same net */
           uint64_t ips_noproto;           /* unknown or unsupported protocol */
           uint64_t ips_delivered;         /* datagrams delivered to upper level*/
           uint64_t ips_localout;          /* total ip packets generated here */
           uint64_t ips_odropped;          /* lost packets due to nobufs, etc. */
           uint64_t ips_reassembled;       /* total packets reassembled ok */
           uint64_t ips_fragmented;        /* datagrams successfully fragmented */
           uint64_t ips_ofragments;        /* output fragments created */
           uint64_t ips_cantfrag;          /* don't fragment flag was set, etc. */
           uint64_t ips_badoptions;                /* error in option processing */
           uint64_t ips_noroute;           /* packets discarded due to no route */
           uint64_t ips_badvers;           /* ip version != 4 */
           uint64_t ips_rawout;            /* total raw ip packets generated */
           uint64_t ips_toolong;           /* ip length > max ip packet size */
           uint64_t ips_notmember;         /* multicasts for unregistered grps */
           uint64_t ips_nogif;             /* no match gif found */
           uint64_t ips_badaddr;           /* invalid address on header */
   };
   
   #ifdef _KERNEL
   
   #include <sys/counter.h>
   #include <net/vnet.h>
   
   VNET_PCPUSTAT_DECLARE(struct ipstat, ipstat);
   /*
    * In-kernel consumers can use these accessor macros directly to update
    * stats.
    */
   #define IPSTAT_ADD(name, val)   \
       VNET_PCPUSTAT_ADD(struct ipstat, ipstat, name, (val))
   #define IPSTAT_SUB(name, val)   IPSTAT_ADD(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(uint64_t))
   void    kmod_ipstat_dec(int statnum);
   #define KMOD_IPSTAT_DEC(name)   \
       kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(uint64_t))
   
   /* 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 */
   #define IP_NODEFAULTFLOWID      0x40            /* Don't set the flowid from inp */
   #define IP_NO_SND_TAG_RL        0x80            /* Don't send down the ratelimit tag */
   
   #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;
   struct inpcbinfo;
   
   VNET_DECLARE(int, ip_defttl);                   /* default IP ttl */
   VNET_DECLARE(int, ipforwarding);                /* ip forwarding */
   VNET_DECLARE(int, ipsendredirects);
   #ifdef IPSTEALTH
   VNET_DECLARE(int, ipstealth);                   /* stealth forwarding */
   #endif
   VNET_DECLARE(struct socket *, ip_rsvpd);        /* reservation protocol daemon*/
   VNET_DECLARE(struct socket *, ip_mrouter);      /* multicast routing daemon */
   extern int      (*legal_vif_num)(int);
   extern u_long   (*ip_mcast_src)(int);
   VNET_DECLARE(int, rsvp_on);
   VNET_DECLARE(int, drop_redirect);
   
   #define V_ip_id                 VNET(ip_id)
   #define V_ip_defttl             VNET(ip_defttl)
   #define V_ipforwarding          VNET(ipforwarding)
   #define V_ipsendredirects       VNET(ipsendredirects)
   #ifdef IPSTEALTH
   #define V_ipstealth             VNET(ipstealth)
   #endif
   #define V_ip_rsvpd              VNET(ip_rsvpd)
   #define V_ip_mrouter            VNET(ip_mrouter)
   #define V_rsvp_on               VNET(rsvp_on)
   #define V_drop_redirect         VNET(drop_redirect)
   
   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);
   int     ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
               u_long if_hwassist_flags);
   void    ip_forward(struct mbuf *m, int srcrt);
   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 *);
   struct mbuf *
           ip_reass(struct mbuf *);
   void    ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
               struct mbuf *);
   void    ip_fillid(struct ip *);
   int     rip_ctloutput(struct socket *, struct sockopt *);
   int     ipip_input(struct mbuf **, int *, int);
   int     rsvp_input(struct mbuf **, int *, 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 int      (*rsvp_input_p)(struct mbuf **, int *, int);
   
   typedef int     ipproto_input_t(struct mbuf **, int *, int);
   struct icmp;
   typedef void    ipproto_ctlinput_t(struct icmp *);
   int     ipproto_register(uint8_t, ipproto_input_t, ipproto_ctlinput_t);
   int     ipproto_unregister(uint8_t);
   #define IPPROTO_REGISTER(prot, input, ctl)      do {                    \
           int error __diagused;                                           \
           error = ipproto_register(prot, input, ctl);                     \
           MPASS(error == 0);                                              \
   } while (0)
   
   ipproto_input_t         rip_input;
   ipproto_ctlinput_t      rip_ctlinput;
   
   VNET_DECLARE(struct pfil_head *, inet_pfil_head);
   #define V_inet_pfil_head        VNET(inet_pfil_head)
   #define PFIL_INET_NAME          "inet"
   
   void    in_delayed_cksum(struct mbuf *m);
   
   /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
   /*
    * Reference to an ipfw or packet filter rule that can be carried
    * outside critical sections.
    * A rule is identified by rulenum:rule_id which is ordered.
    * In version chain_id the rule can be found in slot 'slot', so
    * we don't need a lookup if chain_id == chain->id.
    *
    * On exit from the firewall this structure refers to the rule after
    * the matching one (slot points to the new rule; rulenum:rule_id-1
    * is the matching rule), and additional info (e.g. info often contains
    * the insn argument or tablearg in the low 16 bits, in host format).
    * On entry, the structure is valid if slot>0, and refers to the starting
    * rules. 'info' contains the reason for reinject, e.g. divert port,
    * divert direction, and so on.
    */
   struct ipfw_rule_ref {
           uint32_t        slot;           /* slot for matching rule       */
           uint32_t        rulenum;        /* matching rule number         */
           uint32_t        rule_id;        /* matching rule id             */
           uint32_t        chain_id;       /* ruleset id                   */
           uint32_t        info;           /* see below                    */
   };
   
   enum {
           IPFW_INFO_MASK  = 0x0000ffff,
           IPFW_INFO_OUT   = 0x00000000,   /* outgoing, just for convenience */
           IPFW_INFO_IN    = 0x80000000,   /* incoming, overloads dir */
           IPFW_ONEPASS    = 0x40000000,   /* One-pass, do not reinject */
           IPFW_IS_MASK    = 0x30000000,   /* which source ? */
           IPFW_IS_DIVERT  = 0x20000000,
           IPFW_IS_DUMMYNET =0x10000000,
           IPFW_IS_PIPE    = 0x08000000,   /* pipe=1, queue = 0 */
   };
   #define MTAG_IPFW       1148380143      /* IPFW-tagged cookie */
   #define MTAG_IPFW_RULE  1262273568      /* rule reference */
   #define MTAG_IPFW_CALL  1308397630      /* call stack */
   
   struct ip_fw_args;
   typedef int     (*ip_fw_chk_ptr_t)(struct ip_fw_args *args);
   typedef int     (*ip_fw_ctl_ptr_t)(struct sockopt *);
   VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr);
   #define V_ip_fw_ctl_ptr         VNET(ip_fw_ctl_ptr)
   
   /* Divert hooks. */
   extern void     (*ip_divert_ptr)(struct mbuf *m, bool incoming);
   /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */
   extern int      (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool);
   extern int      (*ip_dn_ctl_ptr)(struct sockopt *);
   extern int      (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *);
   #endif /* _KERNEL */
   
   #endif /* !_NETINET_IP_VAR_H_ */

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