238 lines
9.5 KiB
C
238 lines
9.5 KiB
C
/* $NetBSD: ip_var.h,v 1.37 1999/07/01 08:12:51 itojun Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip_var.h 8.2 (Berkeley) 1/9/95
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*/
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#ifndef _NETINET_IP_VAR_H_
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#define _NETINET_IP_VAR_H_
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#include <sys/queue.h>
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#include <net/route.h>
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/*
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* Overlay for ip header used by other protocols (tcp, udp).
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*/
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struct ipovly {
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u_int8_t ih_x1[9]; /* (unused) */
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u_int8_t ih_pr; /* protocol */
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u_int16_t ih_len; /* protocol length */
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struct in_addr ih_src; /* source internet address */
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struct in_addr ih_dst; /* destination internet address */
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};
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/*
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* Ip (reassembly or sequence) queue structures.
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*
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* XXX -- The following explains why the ipqe_m field is here, for TCP's use:
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* We want to avoid doing m_pullup on incoming packets but that
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* means avoiding dtom on the tcp reassembly code. That in turn means
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* keeping an mbuf pointer in the reassembly queue (since we might
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* have a cluster). As a quick hack, the source & destination
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* port numbers (which are no longer needed once we've located the
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* tcpcb) are overlayed with an mbuf pointer.
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*/
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LIST_HEAD(ipqehead, ipqent);
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struct ipqent {
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LIST_ENTRY(ipqent) ipqe_q;
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union {
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struct ip *_ip;
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struct tcpiphdr *_tcp;
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} _ipqe_u1;
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struct mbuf *ipqe_m; /* mbuf contains packet */
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u_int8_t ipqe_mff; /* for IP fragmentation */
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/*
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* The following are used in TCP reassembly
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*/
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LIST_ENTRY(ipqent) ipqe_timeq;
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u_int32_t ipqe_seq;
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u_int32_t ipqe_len;
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u_int32_t ipqe_flags;
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};
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#define ipqe_ip _ipqe_u1._ip
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#define ipqe_tcp _ipqe_u1._tcp
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/*
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* Ip reassembly queue structure. Each fragment
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* being reassembled is attached to one of these structures.
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* They are timed out after ipq_ttl drops to 0, and may also
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* be reclaimed if memory becomes tight.
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*/
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struct ipq {
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LIST_ENTRY(ipq) ipq_q; /* to other reass headers */
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u_int8_t ipq_ttl; /* time for reass q to live */
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u_int8_t ipq_p; /* protocol of this fragment */
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u_int16_t ipq_id; /* sequence id for reassembly */
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struct ipqehead ipq_fragq; /* to ip fragment queue */
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struct in_addr ipq_src, ipq_dst;
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};
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/*
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* Structure stored in mbuf in inpcb.ip_options
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* and passed to ip_output when ip options are in use.
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* The actual length of the options (including ipopt_dst)
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* is in m_len.
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*/
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#define MAX_IPOPTLEN 40
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struct ipoption {
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struct in_addr ipopt_dst; /* first-hop dst if source routed */
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int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
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};
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/*
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* Structure attached to inpcb.ip_moptions and
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* passed to ip_output when IP multicast options are in use.
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*/
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struct ip_moptions {
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struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
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u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */
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u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */
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u_int16_t imo_num_memberships; /* no. memberships this socket */
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struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
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};
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struct ipstat {
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u_long ips_total; /* total packets received */
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u_long ips_badsum; /* checksum bad */
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u_long ips_tooshort; /* packet too short */
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u_long ips_toosmall; /* not enough data */
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u_long ips_badhlen; /* ip header length < data size */
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u_long ips_badlen; /* ip length < ip header length */
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u_long ips_fragments; /* fragments received */
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u_long ips_fragdropped; /* frags dropped (dups, out of space) */
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u_long ips_fragtimeout; /* fragments timed out */
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u_long ips_forward; /* packets forwarded */
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u_long ips_fastforward; /* packets fast forwarded */
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u_long ips_cantforward; /* packets rcvd for unreachable dest */
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u_long ips_redirectsent; /* packets forwarded on same net */
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u_long ips_noproto; /* unknown or unsupported protocol */
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u_long ips_delivered; /* datagrams delivered to upper level*/
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u_long ips_localout; /* total ip packets generated here */
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u_long ips_odropped; /* lost packets due to nobufs, etc. */
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u_long ips_reassembled; /* total packets reassembled ok */
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u_long ips_fragmented; /* datagrams sucessfully fragmented */
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u_long ips_ofragments; /* output fragments created */
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u_long ips_cantfrag; /* don't fragment flag was set, etc. */
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u_long ips_badoptions; /* error in option processing */
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u_long ips_noroute; /* packets discarded due to no route */
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u_long ips_badvers; /* ip version != 4 */
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u_long ips_rawout; /* total raw ip packets generated */
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u_long ips_badfrags; /* malformed fragments (bad length) */
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u_long ips_rcvmemdrop; /* frags dropped for lack of memory */
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u_long ips_toolong; /* ip length > max ip packet size */
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u_long ips_nogif; /* no match gif found */
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};
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#define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */
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struct ipflow {
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LIST_ENTRY(ipflow) ipf_list; /* next in active list */
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LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */
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struct in_addr ipf_dst; /* destination address */
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struct in_addr ipf_src; /* source address */
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u_int8_t ipf_tos; /* type-of-service */
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struct route ipf_ro; /* associated route entry */
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u_long ipf_uses; /* number of uses in this period */
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u_long ipf_last_uses; /* number of uses in last period */
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u_long ipf_dropped; /* ENOBUFS returned by if_output */
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u_long ipf_errors; /* other errors returned by if_output */
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u_int ipf_timer; /* lifetime timer */
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time_t ipf_start; /* creation time */
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};
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#ifdef _KERNEL
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/* flags passed to ip_output as last parameter */
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#define IP_FORWARDING 0x1 /* most of ip header exists */
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#define IP_RAWOUTPUT 0x2 /* raw ip header exists */
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#define IP_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */
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#define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
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#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
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extern struct ipstat ipstat; /* ip statistics */
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extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */
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extern u_int16_t ip_id; /* ip packet ctr, for ids */
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extern int ip_defttl; /* default IP ttl */
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extern int ipforwarding; /* ip forwarding */
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extern int gif_ttl; /* default TTL for gif encap packet */
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extern int ip_mtudisc; /* mtu discovery */
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extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
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extern int anonportmin; /* minimum ephemeral port */
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extern int anonportmax; /* maximum ephemeral port */
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extern struct rttimer_queue *ip_mtudisc_timeout_q;
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#ifdef GATEWAY
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extern int ip_maxflows;
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#endif
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extern struct pool ipqent_pool;
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struct inpcb;
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int ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
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int ip_dooptions __P((struct mbuf *));
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void ip_drain __P((void));
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void ip_forward __P((struct mbuf *, int));
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void ip_freef __P((struct ipq *));
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void ip_freemoptions __P((struct ip_moptions *));
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int ip_getmoptions __P((int, struct ip_moptions *, struct mbuf **));
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void ip_init __P((void));
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int ip_mforward __P((struct mbuf *, struct ifnet *));
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int ip_optcopy __P((struct ip *, struct ip *));
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u_int ip_optlen __P((struct inpcb *));
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int ip_output __P((struct mbuf *, ...));
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int ip_pcbopts __P((struct mbuf **, struct mbuf *));
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struct mbuf *
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ip_reass __P((struct ipqent *, struct ipq *));
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struct in_ifaddr *
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ip_rtaddr __P((struct in_addr));
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void ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *,
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struct mbuf *));
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int ip_setmoptions __P((int, struct ip_moptions **, struct mbuf *));
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void ip_slowtimo __P((void));
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struct mbuf *
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ip_srcroute __P((void));
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void ip_stripoptions __P((struct mbuf *, struct mbuf *));
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int ip_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
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void ipintr __P((void));
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int rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
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void rip_init __P((void));
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void rip_input __P((struct mbuf *, ...));
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int rip_output __P((struct mbuf *, ...));
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int rip_usrreq __P((struct socket *,
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int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
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void ipflow_init __P((void));
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struct ipflow *ipflow_reap __P((int));
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void ipflow_create __P((const struct route *, struct mbuf *));
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void ipflow_slowtimo __P((void));
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#endif
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#endif /* _NETINET_IP_VAR_H_ */
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