ip_var.h revision 1.33 
1/*	$OpenBSD: ip_var.h,v 1.33 2005/05/27 04:55:28 mcbride 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#include <sys/queue.h>
39
40/*
41 * Overlay for ip header used by other protocols (tcp, udp).
42 */
43struct ipovly {
44	u_int8_t  ih_x1[9];		/* (unused) */
45	u_int8_t  ih_pr;		/* protocol */
46	u_int16_t ih_len;		/* protocol length */
47	struct	  in_addr ih_src;	/* source internet address */
48	struct	  in_addr ih_dst;	/* destination internet address */
49};
50
51/*
52 * Ip (reassembly or sequence) queue structures.
53 *
54 * XXX -- The following explains why the ipqe_m field is here, for TCP's use:
55 * We want to avoid doing m_pullup on incoming packets but that
56 * means avoiding dtom on the tcp reassembly code.  That in turn means
57 * keeping an mbuf pointer in the reassembly queue (since we might
58 * have a cluster).  As a quick hack, the source & destination
59 * port numbers (which are no longer needed once we've located the
60 * tcpcb) are overlayed with an mbuf pointer.
61 */
62LIST_HEAD(ipqehead, ipqent);
63struct ipqent {
64	LIST_ENTRY(ipqent) ipqe_q;
65	union {
66		struct ip	*_ip;
67		struct tcphdr	*_tcp;
68	} _ipqe_u1;
69	struct mbuf	*ipqe_m;	/* mbuf contains packet */
70	u_int8_t	ipqe_mff;	/* for IP fragmentation */
71};
72#define	ipqe_ip		_ipqe_u1._ip
73#define	ipqe_tcp	_ipqe_u1._tcp
74
75/*
76 * Ip reassembly queue structure.  Each fragment
77 * being reassembled is attached to one of these structures.
78 * They are timed out after ipq_ttl drops to 0, and may also
79 * be reclaimed if memory becomes tight.
80 */
81struct ipq {
82	LIST_ENTRY(ipq) ipq_q;		/* to other reass headers */
83	u_int8_t  ipq_ttl;		/* time for reass q to live */
84	u_int8_t  ipq_p;		/* protocol of this fragment */
85	u_int16_t ipq_id;		/* sequence id for reassembly */
86	struct	  ipqehead ipq_fragq;	/* to ip fragment queue */
87	struct	  in_addr ipq_src, ipq_dst;
88};
89
90/*
91 * Structure stored in mbuf in inpcb.ip_options
92 * and passed to ip_output when ip options are in use.
93 * The actual length of the options (including ipopt_dst)
94 * is in m_len.
95 */
96#define	MAX_IPOPTLEN	40
97
98struct ipoption {
99	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */
100	int8_t	ipopt_list[MAX_IPOPTLEN];	/* options proper */
101};
102
103/*
104 * Structure attached to inpcb.ip_moptions and
105 * passed to ip_output when IP multicast options are in use.
106 */
107struct ip_moptions {
108	struct	  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
109	u_int8_t  imo_multicast_ttl;	/* TTL for outgoing multicasts */
110	u_int8_t  imo_multicast_loop;	/* 1 => hear sends if a member */
111	u_int16_t imo_num_memberships;	/* no. memberships this socket */
112	struct	  in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
113};
114
115struct	ipstat {
116	u_long	ips_total;		/* total packets received */
117	u_long	ips_badsum;		/* checksum bad */
118	u_long	ips_tooshort;		/* packet too short */
119	u_long	ips_toosmall;		/* not enough data */
120	u_long	ips_badhlen;		/* ip header length < data size */
121	u_long	ips_badlen;		/* ip length < ip header length */
122	u_long	ips_fragments;		/* fragments received */
123	u_long	ips_fragdropped;	/* frags dropped (dups, out of space) */
124	u_long	ips_fragtimeout;	/* fragments timed out */
125	u_long	ips_forward;		/* packets forwarded */
126	u_long	ips_cantforward;	/* packets rcvd for unreachable dest */
127	u_long	ips_redirectsent;	/* packets forwarded on same net */
128	u_long	ips_noproto;		/* unknown or unsupported protocol */
129	u_long	ips_delivered;		/* datagrams delivered to upper level*/
130	u_long	ips_localout;		/* total ip packets generated here */
131	u_long	ips_odropped;		/* lost packets due to nobufs, etc. */
132	u_long	ips_reassembled;	/* total packets reassembled ok */
133	u_long	ips_fragmented;		/* datagrams successfully fragmented */
134	u_long	ips_ofragments;		/* output fragments created */
135	u_long	ips_cantfrag;		/* don't fragment flag was set, etc. */
136	u_long	ips_badoptions;		/* error in option processing */
137	u_long	ips_noroute;		/* packets discarded due to no route */
138	u_long	ips_badvers;		/* ip version != 4 */
139	u_long	ips_rawout;		/* total raw ip packets generated */
140	u_long	ips_badfrags;		/* malformed fragments (bad length) */
141	u_long	ips_rcvmemdrop;		/* frags dropped for lack of memory */
142	u_long	ips_toolong;		/* ip length > max ip packet size */
143	u_long	ips_nogif;		/* no match gif found */
144	u_long	ips_badaddr;		/* invalid address on header */
145	u_long	ips_inhwcsum;		/* hardware checksummed on input */
146	u_long	ips_outhwcsum;		/* hardware checksummed on output */
147};
148
149#ifdef _KERNEL
150/* flags passed to ip_output as last parameter */
151#define	IP_FORWARDING		0x1		/* most of ip header exists */
152#define	IP_RAWOUTPUT		0x2		/* raw ip header exists */
153#define	IP_ROUTETOIF		SO_DONTROUTE	/* bypass routing tables */
154#define	IP_ALLOWBROADCAST	SO_BROADCAST	/* can send broadcast packets */
155#define IP_JUMBO		SO_JUMBO	/* try to use the jumbo mtu */
156#define	IP_MTUDISC		0x0800		/* pmtu discovery, set DF */
157#define IP_ROUTETOETHER		0x1000		/* ether addresses given */
158
159extern struct ipstat ipstat;
160extern LIST_HEAD(ipqhead, ipq)	ipq;	/* ip reass. queue */
161extern int ip_defttl;			/* default IP ttl */
162
163extern int ip_mtudisc;			/* mtu discovery */
164extern u_int ip_mtudisc_timeout;	/* seconds to timeout mtu discovery */
165extern struct rttimer_queue *ip_mtudisc_timeout_q;
166extern struct pool ipqent_pool;
167
168int	 ip_ctloutput(int, struct socket *, int, int, struct mbuf **);
169int	 ip_dooptions(struct mbuf *);
170void	 ip_drain(void);
171void	 ip_flush(void);
172void	 ip_forward(struct mbuf *, int);
173int	 ip_fragment(struct mbuf *, struct ifnet *, u_long);
174void	 ip_freef(struct ipq *);
175void	 ip_freemoptions(struct ip_moptions *);
176int	 ip_getmoptions(int, struct ip_moptions *, struct mbuf **);
177void	 ip_init(void);
178int	 ip_mforward(struct mbuf *, struct ifnet *);
179int	 ip_optcopy(struct ip *, struct ip *);
180int	 ip_output(struct mbuf *, ...);
181int	 ip_pcbopts(struct mbuf **, struct mbuf *);
182struct mbuf *
183	 ip_reass(struct ipqent *, struct ipq *);
184struct in_ifaddr *
185	 in_iawithaddr(struct in_addr, struct mbuf *);
186struct in_ifaddr *
187	 ip_rtaddr(struct in_addr);
188u_int16_t
189	 ip_randomid(void);
190int	 ip_setmoptions(int, struct ip_moptions **, struct mbuf *);
191void	 ip_slowtimo(void);
192struct mbuf *
193	 ip_srcroute(void);
194void	 ip_stripoptions(struct mbuf *, struct mbuf *);
195int	 ip_sysctl(int *, u_int, void *, size_t *, void *, size_t);
196void	 ipintr(void);
197void	 ipv4_input(struct mbuf *);
198int	 rip_ctloutput(int, struct socket *, int, int, struct mbuf **);
199void	 rip_init(void);
200void	 rip_input(struct mbuf *, ...);
201int	 rip_output(struct mbuf *, ...);
202int	 rip_usrreq(struct socket *,
203	    int, struct mbuf *, struct mbuf *, struct mbuf *);
204#endif /* _KERNEL */
205#endif /* _NETINET_IP_VAR_H_ */
206