ip_var.h revision 19669
1/*
2 * Copyright (c) 1982, 1986, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)ip_var.h	8.2 (Berkeley) 1/9/95
34 *	$Id: ip_var.h,v 1.25 1996/11/11 04:56:21 fenner Exp $
35 */
36
37#ifndef _NETINET_IP_VAR_H_
38#define	_NETINET_IP_VAR_H_
39
40/*
41 * Overlay for ip header used by other protocols (tcp, udp).
42 */
43struct ipovly {
44	caddr_t	ih_next, ih_prev;	/* for protocol sequence q's */
45	u_char	ih_x1;			/* (unused) */
46	u_char	ih_pr;			/* protocol */
47	u_short	ih_len;			/* protocol length */
48	struct	in_addr ih_src;		/* source internet address */
49	struct	in_addr ih_dst;		/* destination internet address */
50};
51
52/*
53 * Ip reassembly queue structure.  Each fragment
54 * being reassembled is attached to one of these structures.
55 * They are timed out after ipq_ttl drops to 0, and may also
56 * be reclaimed if memory becomes tight.
57 */
58struct ipq {
59	struct	ipq *next,*prev;	/* to other reass headers */
60	u_char	ipq_ttl;		/* time for reass q to live */
61	u_char	ipq_p;			/* protocol of this fragment */
62	u_short	ipq_id;			/* sequence id for reassembly */
63	struct	ipasfrag *ipq_next,*ipq_prev;
64					/* to ip headers of fragments */
65	struct	in_addr ipq_src,ipq_dst;
66#ifdef IPDIVERT
67	u_short ipq_divert;		/* divert protocol port */
68#endif
69};
70
71/*
72 * Ip header, when holding a fragment.
73 *
74 * Note: ipf_next must be at same offset as ipq_next above
75 */
76struct	ipasfrag {
77#if BYTE_ORDER == LITTLE_ENDIAN
78	u_char	ip_hl:4,
79		ip_v:4;
80#endif
81#if BYTE_ORDER == BIG_ENDIAN
82	u_char	ip_v:4,
83		ip_hl:4;
84#endif
85	u_char	ipf_mff;		/* XXX overlays ip_tos: use low bit
86					 * to avoid destroying tos;
87					 * copied from (ip_off&IP_MF) */
88	u_short	ip_len;
89	u_short	ip_id;
90	u_short	ip_off;
91	u_char	ip_ttl;
92	u_char	ip_p;
93	u_short	ip_sum;
94	struct	ipasfrag *ipf_next;	/* next fragment */
95	struct	ipasfrag *ipf_prev;	/* previous fragment */
96};
97
98/*
99 * Structure stored in mbuf in inpcb.ip_options
100 * and passed to ip_output when ip options are in use.
101 * The actual length of the options (including ipopt_dst)
102 * is in m_len.
103 */
104#define MAX_IPOPTLEN	40
105
106struct ipoption {
107	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */
108	char	ipopt_list[MAX_IPOPTLEN];	/* options proper */
109};
110
111/*
112 * Structure attached to inpcb.ip_moptions and
113 * passed to ip_output when IP multicast options are in use.
114 */
115struct ip_moptions {
116	struct	ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
117	u_char	imo_multicast_ttl;	/* TTL for outgoing multicasts */
118	u_char	imo_multicast_loop;	/* 1 => hear sends if a member */
119	u_short	imo_num_memberships;	/* no. memberships this socket */
120	struct	in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
121	u_long	imo_multicast_vif;	/* vif num outgoing multicasts */
122};
123
124struct	ipstat {
125	u_long	ips_total;		/* total packets received */
126	u_long	ips_badsum;		/* checksum bad */
127	u_long	ips_tooshort;		/* packet too short */
128	u_long	ips_toosmall;		/* not enough data */
129	u_long	ips_badhlen;		/* ip header length < data size */
130	u_long	ips_badlen;		/* ip length < ip header length */
131	u_long	ips_fragments;		/* fragments received */
132	u_long	ips_fragdropped;	/* frags dropped (dups, out of space) */
133	u_long	ips_fragtimeout;	/* fragments timed out */
134	u_long	ips_forward;		/* packets forwarded */
135	u_long	ips_cantforward;	/* packets rcvd for unreachable dest */
136	u_long	ips_redirectsent;	/* packets forwarded on same net */
137	u_long	ips_noproto;		/* unknown or unsupported protocol */
138	u_long	ips_delivered;		/* datagrams delivered to upper level*/
139	u_long	ips_localout;		/* total ip packets generated here */
140	u_long	ips_odropped;		/* lost packets due to nobufs, etc. */
141	u_long	ips_reassembled;	/* total packets reassembled ok */
142	u_long	ips_fragmented;		/* datagrams successfully fragmented */
143	u_long	ips_ofragments;		/* output fragments created */
144	u_long	ips_cantfrag;		/* don't fragment flag was set, etc. */
145	u_long	ips_badoptions;		/* error in option processing */
146	u_long	ips_noroute;		/* packets discarded due to no route */
147	u_long	ips_badvers;		/* ip version != 4 */
148	u_long	ips_rawout;		/* total raw ip packets generated */
149	u_long	ips_toolong;		/* ip length > max ip packet size */
150};
151
152#ifdef KERNEL
153/* flags passed to ip_output as last parameter */
154#define	IP_FORWARDING		0x1		/* most of ip header exists */
155#define	IP_RAWOUTPUT		0x2		/* raw ip header exists */
156#define	IP_ROUTETOIF		SO_DONTROUTE	/* bypass routing tables */
157#define	IP_ALLOWBROADCAST	SO_BROADCAST	/* can send broadcast packets */
158
159struct inpcb;
160struct route;
161
162extern struct	ipstat	ipstat;
163extern struct	ipq	ipq;			/* ip reass. queue */
164extern u_short	ip_id;				/* ip packet ctr, for ids */
165extern int	ip_defttl;			/* default IP ttl */
166extern u_char	ip_protox[];
167extern struct socket *ip_rsvpd;	/* reservation protocol daemon */
168extern struct socket *ip_mrouter; /* multicast routing daemon */
169extern int	(*legal_vif_num) __P((int));
170extern u_long	(*ip_mcast_src) __P((int));
171extern int rsvp_on;
172
173int	 ip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
174void	 ip_drain __P((void));
175void	 ip_freemoptions __P((struct ip_moptions *));
176void	 ip_init __P((void));
177extern int	 (*ip_mforward) __P((struct ip *, struct ifnet *, struct mbuf *,
178			  struct ip_moptions *));
179int	 ip_output __P((struct mbuf *,
180	    struct mbuf *, struct route *, int, struct ip_moptions *));
181void	 ip_savecontrol __P((struct inpcb *, struct mbuf **, struct ip *,
182		struct mbuf *));
183void	 ip_slowtimo __P((void));
184struct mbuf *
185	 ip_srcroute __P((void));
186void	 ip_stripoptions __P((struct mbuf *, struct mbuf *));
187int	 rip_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
188void	 rip_init __P((void));
189void	 rip_input __P((struct mbuf *, int));
190int	 rip_output __P((struct mbuf *, struct socket *, u_long));
191int	 rip_usrreq __P((struct socket *,
192	    int, struct mbuf *, struct mbuf *, struct mbuf *));
193void	ipip_input __P((struct mbuf *, int));
194void	rsvp_input __P((struct mbuf *, int));
195int	ip_rsvp_init __P((struct socket *));
196int	ip_rsvp_done __P((void));
197int	ip_rsvp_vif_init __P((struct socket *, struct mbuf *));
198int	ip_rsvp_vif_done __P((struct socket *, struct mbuf *));
199void	ip_rsvp_force_done __P((struct socket *));
200
201#ifdef IPDIVERT
202void	div_init __P((void));
203void	div_input __P((struct mbuf *, int));
204int	div_usrreq __P((struct socket *,
205		int, struct mbuf *, struct mbuf *, struct mbuf *));
206extern u_short ip_divert_port;
207extern u_short ip_divert_ignore;
208#endif /* IPDIVERT */
209
210#endif /* KERNEL */
211
212#endif /* _NETINET_IP_VAR_H_ */
213