The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $OpenBSD: ip_var.h,v 1.108 2022/11/17 18:05:43 mvs Exp $        */
    2 /*      $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos Exp $     */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)ip_var.h    8.1 (Berkeley) 6/10/93
   33  */
   34 
   35 #ifndef _NETINET_IP_VAR_H_
   36 #define _NETINET_IP_VAR_H_
   37 
   38 /*
   39  * Structure stored in mbuf in inpcb.ip_options
   40  * and passed to ip_output when ip options are in use.
   41  * The actual length of the options (including ipopt_dst)
   42  * is in m_len.
   43  */
   44 #define MAX_IPOPTLEN    40
   45 
   46 /*
   47  * Overlay for ip header used by other protocols (tcp, udp).
   48  */
   49 struct ipovly {
   50         u_int8_t  ih_x1[9];             /* (unused) */
   51         u_int8_t  ih_pr;                /* protocol */
   52         u_int16_t ih_len;               /* protocol length */
   53         struct    in_addr ih_src;       /* source internet address */
   54         struct    in_addr ih_dst;       /* destination internet address */
   55 };
   56 
   57 struct  ipstat {
   58         u_long  ips_total;              /* total packets received */
   59         u_long  ips_badsum;             /* checksum bad */
   60         u_long  ips_tooshort;           /* packet too short */
   61         u_long  ips_toosmall;           /* not enough data */
   62         u_long  ips_badhlen;            /* ip header length < data size */
   63         u_long  ips_badlen;             /* ip length < ip header length */
   64         u_long  ips_fragments;          /* fragments received */
   65         u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
   66         u_long  ips_fragtimeout;        /* fragments timed out */
   67         u_long  ips_forward;            /* packets forwarded */
   68         u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
   69         u_long  ips_redirectsent;       /* packets forwarded on same net */
   70         u_long  ips_noproto;            /* unknown or unsupported protocol */
   71         u_long  ips_delivered;          /* datagrams delivered to upper level*/
   72         u_long  ips_localout;           /* total ip packets generated here */
   73         u_long  ips_odropped;           /* lost output due to nobufs, etc. */
   74         u_long  ips_reassembled;        /* total packets reassembled ok */
   75         u_long  ips_fragmented;         /* datagrams successfully fragmented */
   76         u_long  ips_ofragments;         /* output fragments created */
   77         u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
   78         u_long  ips_badoptions;         /* error in option processing */
   79         u_long  ips_noroute;            /* packets discarded due to no route */
   80         u_long  ips_badvers;            /* ip version != 4 */
   81         u_long  ips_rawout;             /* total raw ip packets generated */
   82         u_long  ips_badfrags;           /* malformed fragments (bad length) */
   83         u_long  ips_rcvmemdrop;         /* frags dropped for lack of memory */
   84         u_long  ips_toolong;            /* ip length > max ip packet size */
   85         u_long  ips_nogif;              /* no match gif found */
   86         u_long  ips_badaddr;            /* invalid address on header */
   87         u_long  ips_inswcsum;           /* software checksummed on input */
   88         u_long  ips_outswcsum;          /* software checksummed on output */
   89         u_long  ips_notmember;          /* multicasts for unregistered groups */
   90         u_long  ips_wrongif;            /* packet received on wrong interface */
   91         u_long  ips_idropped;           /* lost input due to nobufs, etc. */
   92 };
   93 
   94 struct ipoption {
   95         struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
   96         int8_t  ipopt_list[MAX_IPOPTLEN];       /* options proper */
   97 };
   98 
   99 #ifdef _KERNEL
  100 
  101 #include <sys/percpu.h>
  102 
  103 enum ipstat_counters {
  104         ips_total,              /* total packets received */
  105         ips_badsum,             /* checksum bad */
  106         ips_tooshort,           /* packet too short */
  107         ips_toosmall,           /* not enough data */
  108         ips_badhlen,            /* ip header length < data size */
  109         ips_badlen,             /* ip length < ip header length */
  110         ips_fragments,          /* fragments received */
  111         ips_fragdropped,        /* frags dropped (dups, out of space) */
  112         ips_fragtimeout,        /* fragments timed out */
  113         ips_forward,            /* packets forwarded */
  114         ips_cantforward,        /* packets rcvd for unreachable dest */
  115         ips_redirectsent,       /* packets forwarded on same net */
  116         ips_noproto,            /* unknown or unsupported protocol */
  117         ips_delivered,          /* datagrams delivered to upper level*/
  118         ips_localout,           /* total ip packets generated here */
  119         ips_odropped,           /* lost output packets due to nobufs, etc. */
  120         ips_reassembled,        /* total packets reassembled ok */
  121         ips_fragmented,         /* datagrams successfully fragmented */
  122         ips_ofragments,         /* output fragments created */
  123         ips_cantfrag,           /* don't fragment flag was set, etc. */
  124         ips_badoptions,         /* error in option processing */
  125         ips_noroute,            /* packets discarded due to no route */
  126         ips_badvers,            /* ip version != 4 */
  127         ips_rawout,             /* total raw ip packets generated */
  128         ips_badfrags,           /* malformed fragments (bad length) */
  129         ips_rcvmemdrop,         /* frags dropped for lack of memory */
  130         ips_toolong,            /* ip length > max ip packet size */
  131         ips_nogif,              /* no match gif found */
  132         ips_badaddr,            /* invalid address on header */
  133         ips_inswcsum,           /* software checksummed on input */
  134         ips_outswcsum,          /* software checksummed on output */
  135         ips_notmember,          /* multicasts for unregistered groups */
  136         ips_wrongif,            /* packet received on wrong interface */
  137         ips_idropped,           /* lost input packets due to nobufs, etc. */
  138 
  139         ips_ncounters
  140 };
  141 
  142 extern struct cpumem *ipcounters;
  143 
  144 static inline void
  145 ipstat_inc(enum ipstat_counters c)
  146 {
  147         counters_inc(ipcounters, c);
  148 }
  149 
  150 static inline void
  151 ipstat_add(enum ipstat_counters c, uint64_t v)
  152 {
  153         counters_add(ipcounters, c, v);
  154 }
  155 
  156 /*
  157  * Structure attached to inpcb.ip_moptions and
  158  * passed to ip_output when IP multicast options are in use.
  159  */
  160 struct ip_moptions {
  161         struct in_multi **imo_membership; /* group memberships */
  162         unsigned short imo_ifidx;       /* ifp index for outgoing multicasts */
  163         u_int8_t  imo_ttl;      /* TTL for outgoing multicasts */
  164         u_int8_t  imo_loop;     /* 1 => hear sends if a member */
  165         u_int16_t imo_num_memberships;  /* no. memberships this socket */
  166         u_int16_t imo_max_memberships;  /* max memberships this socket */
  167 };
  168 
  169 #include <sys/queue.h>
  170 
  171 /*
  172  * Ip reassembly queue structures.
  173  */
  174 LIST_HEAD(ipqehead, ipqent);
  175 struct ipqent {
  176         LIST_ENTRY(ipqent) ipqe_q;
  177         struct ip       *ipqe_ip;
  178         struct mbuf     *ipqe_m;        /* mbuf contains packet */
  179         uint16_t         ipqe_mff;      /* for IP fragmentation */
  180 };
  181 
  182 /*
  183  * Ip reassembly queue structure.  Each fragment
  184  * being reassembled is attached to one of these structures.
  185  * They are timed out after ipq_ttl drops to 0, and may also
  186  * be reclaimed if memory becomes tight.
  187  */
  188 struct ipq {
  189         LIST_ENTRY(ipq) ipq_q;          /* to other reass headers */
  190         u_int8_t  ipq_ttl;              /* time for reass q to live */
  191         u_int8_t  ipq_p;                /* protocol of this fragment */
  192         u_int16_t ipq_id;               /* sequence id for reassembly */
  193         struct    ipqehead ipq_fragq;   /* to ip fragment queue */
  194         struct    in_addr ipq_src, ipq_dst;
  195 };
  196 
  197 /* flags passed to ip_output */
  198 #define IP_FORWARDING           0x1             /* most of ip header exists */
  199 #define IP_RAWOUTPUT            0x2             /* raw ip header exists */
  200 #define IP_ALLOWBROADCAST       SO_BROADCAST    /* can send broadcast packets */
  201 #define IP_MTUDISC              0x0800          /* pmtu discovery, set DF */
  202 
  203 extern struct ipstat ipstat;
  204 extern int ip_defttl;                   /* default IP ttl */
  205 
  206 #define IPMTUDISCTIMEOUT (10 * 60)      /* as per RFC 1191 */
  207 
  208 extern int ip_mtudisc;                  /* mtu discovery */
  209 extern int ip_mtudisc_timeout;          /* seconds to timeout mtu discovery */
  210 
  211 extern int ipport_firstauto;            /* min port for port allocation */
  212 extern int ipport_lastauto;             /* max port for port allocation */
  213 extern int ipport_hifirstauto;          /* min dynamic/private port number */
  214 extern int ipport_hilastauto;           /* max dynamic/private port number */
  215 extern int ipforwarding;                /* enable IP forwarding */
  216 #ifdef MROUTING
  217 extern int ipmforwarding;               /* enable multicast forwarding */
  218 #endif
  219 extern int ipmultipath;                 /* enable multipath routing */
  220 extern int la_hold_total;
  221 
  222 extern const struct pr_usrreqs rip_usrreqs;
  223 
  224 extern struct rttimer_queue ip_mtudisc_timeout_q;
  225 extern struct pool ipqent_pool;
  226 struct route;
  227 struct inpcb;
  228 
  229 int      ip_ctloutput(int, struct socket *, int, int, struct mbuf *);
  230 int      ip_fragment(struct mbuf *, struct mbuf_list *, struct ifnet *, u_long);
  231 void     ip_freemoptions(struct ip_moptions *);
  232 int      ip_getmoptions(int, struct ip_moptions *, struct mbuf *);
  233 void     ip_init(void);
  234 struct mbuf*
  235          ip_insertoptions(struct mbuf *, struct mbuf *, int *);
  236 int      ip_mforward(struct mbuf *, struct ifnet *);
  237 int      ip_optcopy(struct ip *, struct ip *);
  238 int      ip_output(struct mbuf *, struct mbuf *, struct route *, int,
  239             struct ip_moptions *, struct inpcb *, u_int32_t);
  240 u_int16_t
  241          ip_randomid(void);
  242 void     ip_send(struct mbuf *);
  243 void     ip_send_raw(struct mbuf *);
  244 void     ip_slowtimo(void);
  245 struct mbuf *
  246          ip_srcroute(struct mbuf *);
  247 void     ip_stripoptions(struct mbuf *);
  248 int      ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
  249 void     ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
  250             struct mbuf *);
  251 int      ip_input_if(struct mbuf **, int *, int, int, struct ifnet *);
  252 int      ip_deliver(struct mbuf **, int *, int, int);
  253 void     ip_forward(struct mbuf *, struct ifnet *, struct rtentry *, int);
  254 int      rip_ctloutput(int, struct socket *, int, int, struct mbuf *);
  255 void     rip_init(void);
  256 int      rip_input(struct mbuf **, int *, int, int);
  257 int      rip_output(struct mbuf *, struct socket *, struct sockaddr *,
  258             struct mbuf *);
  259 int      rip_attach(struct socket *, int, int);
  260 int      rip_detach(struct socket *);
  261 void     rip_lock(struct socket *);
  262 void     rip_unlock(struct socket *);
  263 int      rip_bind(struct socket *, struct mbuf *, struct proc *);
  264 int      rip_connect(struct socket *, struct mbuf *);
  265 int      rip_disconnect(struct socket *);
  266 int      rip_shutdown(struct socket *);
  267 int      rip_send(struct socket *, struct mbuf *, struct mbuf *,
  268              struct mbuf *);
  269 #ifdef MROUTING
  270 extern struct socket *ip_mrouter[];     /* multicast routing daemon */
  271 #endif
  272 
  273 #endif /* _KERNEL */
  274 #endif /* _NETINET_IP_VAR_H_ */

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