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/* $OpenBSD: ip_var.h,v 1.31 2004/06/06 16:49:09 cedric Exp $ */
/* $NetBSD: ip_var.h,v 1.16 1996/02/13 23:43:20 christos 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 8.1 (Berkeley) 6/10/93
*/
#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_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 */
};
/*
* 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.
*/
LIST_HEAD(ipqehead, ipqent);
struct ipqent {
LIST_ENTRY(ipqent) ipqe_q;
union {
struct ip *_ip;
struct tcphdr *_tcp;
} _ipqe_u1;
struct mbuf *ipqe_m; /* mbuf contains packet */
u_int8_t ipqe_mff; /* for IP fragmentation */
};
#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;
};
/*
* 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 */
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];
};
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_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_badfrags; /* malformed fragments (bad length) */
u_long ips_rcvmemdrop; /* frags dropped for lack of memory */
u_long ips_toolong; /* ip length > max ip packet size */
u_long ips_nogif; /* no match gif found */
u_long ips_badaddr; /* invalid address on header */
u_long ips_inhwcsum; /* hardware checksummed on input */
u_long ips_outhwcsum; /* hardware checksummed on output */
};
#ifdef _KERNEL
/* 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_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
#define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
#define IP_MTUDISC 0x0400 /* pmtu discovery, set DF */
#define IP_ROUTETOETHER 0x0800 /* ether addresses given */
extern struct ipstat ipstat;
extern LIST_HEAD(ipqhead, ipq) ipq; /* ip reass. queue */
extern int ip_defttl; /* default IP ttl */
extern int ip_mtudisc; /* mtu discovery */
extern u_int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */
extern struct rttimer_queue *ip_mtudisc_timeout_q;
extern struct pool ipqent_pool;
int ip_ctloutput(int, struct socket *, int, int, struct mbuf **);
int ip_dooptions(struct mbuf *);
void ip_drain(void);
void ip_flush(void);
void ip_forward(struct mbuf *, int);
int ip_fragment(struct mbuf *, struct ifnet *, u_long);
void ip_freef(struct ipq *);
void ip_freemoptions(struct ip_moptions *);
int ip_getmoptions(int, struct ip_moptions *, struct mbuf **);
void ip_init(void);
int ip_mforward(struct mbuf *, struct ifnet *);
int ip_optcopy(struct ip *, struct ip *);
int ip_output(struct mbuf *, ...);
int ip_pcbopts(struct mbuf **, struct mbuf *);
struct mbuf *
ip_reass(struct ipqent *, struct ipq *);
struct in_ifaddr *
in_iawithaddr(struct in_addr, struct mbuf *);
struct in_ifaddr *
ip_rtaddr(struct in_addr, struct in_addr);
u_int16_t
ip_randomid(void);
int ip_setmoptions(int, struct ip_moptions **, struct mbuf *);
void ip_slowtimo(void);
struct mbuf *
ip_srcroute(void);
void ip_stripoptions(struct mbuf *, struct mbuf *);
int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
void ipintr(void);
void ipv4_input(struct mbuf *);
int rip_ctloutput(int, struct socket *, int, int, struct mbuf **);
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 *);
#endif /* _KERNEL */
#endif /* _NETINET_IP_VAR_H_ */
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