ip_var.h revision 267654 
1/*	$FreeBSD: releng/9.3/contrib/ipfilter/ipsend/ip_var.h 145519 2005-04-25 18:20:15Z darrenr $	*/
2
3/*	@(#)ip_var.h 1.11 88/08/19 SMI; from UCB 7.1 6/5/86	*/
4
5/*
6 * Copyright (c) 1982, 1986 Regents of the University of California.
7 * All rights reserved.  The Berkeley software License Agreement
8 * specifies the terms and conditions for redistribution.
9 */
10
11/*
12 * Overlay for ip header used by other protocols (tcp, udp).
13 */
14
15#ifndef _netinet_ip_var_h
16#define _netinet_ip_var_h
17
18struct ipovly {
19	caddr_t	ih_next, ih_prev;	/* for protocol sequence q's */
20	u_char	ih_x1;			/* (unused) */
21	u_char	ih_pr;			/* protocol */
22	short	ih_len;			/* protocol length */
23	struct	in_addr ih_src;		/* source internet address */
24	struct	in_addr ih_dst;		/* destination internet address */
25};
26
27/*
28 * Ip reassembly queue structure.  Each fragment
29 * being reassembled is attached to one of these structures.
30 * They are timed out after ipq_ttl drops to 0, and may also
31 * be reclaimed if memory becomes tight.
32 */
33struct ipq {
34	struct	ipq *next,*prev;	/* to other reass headers */
35	u_char	ipq_ttl;		/* time for reass q to live */
36	u_char	ipq_p;			/* protocol of this fragment */
37	u_short	ipq_id;			/* sequence id for reassembly */
38	struct	ipasfrag *ipq_next,*ipq_prev;
39					/* to ip headers of fragments */
40	struct	in_addr ipq_src,ipq_dst;
41};
42
43/*
44 * Ip header, when holding a fragment.
45 *
46 * Note: ipf_next must be at same offset as ipq_next above
47 */
48struct	ipasfrag {
49#if defined(vax) || defined(i386)
50	u_char	ip_hl:4,
51		ip_v:4;
52#endif
53#if defined(mc68000) || defined(sparc)
54	u_char	ip_v:4,
55		ip_hl:4;
56#endif
57	u_char	ipf_mff;		/* copied from (ip_off&IP_MF) */
58	short	ip_len;
59	u_short	ip_id;
60	short	ip_off;
61	u_char	ip_ttl;
62	u_char	ip_p;
63	u_short	ip_sum;
64	struct	ipasfrag *ipf_next;	/* next fragment */
65	struct	ipasfrag *ipf_prev;	/* previous fragment */
66};
67
68/*
69 * Structure stored in mbuf in inpcb.ip_options
70 * and passed to ip_output when ip options are in use.
71 * The actual length of the options (including ipopt_dst)
72 * is in m_len.
73 */
74#define MAX_IPOPTLEN	40
75
76struct ipoption {
77	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */
78	char	ipopt_list[MAX_IPOPTLEN];	/* options proper */
79};
80
81/*
82 * Structure stored in an mbuf attached to inpcb.ip_moptions and
83 * passed to ip_output when IP multicast options are in use.
84 */
85struct ip_moptions {
86	struct	ifnet   *imo_multicast_ifp;  /* ifp for outgoing multicasts */
87	u_char		 imo_multicast_ttl;  /* TTL for outgoing multicasts */
88	u_char		 imo_multicast_loop; /* 1 => hear sends if a member */
89	u_short		 imo_num_memberships;/* no. memberships this socket */
90	struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
91#ifdef RSVP_ISI
92	long		 imo_multicast_vif;  /* vif for outgoing multicasts */
93#endif /* RSVP_ISI */
94};
95
96struct	ipstat {
97	long	ips_total;		/* total packets received */
98	long	ips_badsum;		/* checksum bad */
99	long	ips_tooshort;		/* packet too short */
100	long	ips_toosmall;		/* not enough data */
101	long	ips_badhlen;		/* ip header length < data size */
102	long	ips_badlen;		/* ip length < ip header length */
103	long	ips_fragments;		/* fragments received */
104	long	ips_fragdropped;	/* frags dropped (dups, out of space) */
105	long	ips_fragtimeout;	/* fragments timed out */
106	long	ips_forward;		/* packets forwarded */
107	long	ips_cantforward;	/* packets rcvd for unreachable dest */
108	long	ips_redirectsent;	/* packets forwarded on same net */
109};
110
111#ifdef KERNEL
112/* flags passed to ip_output as last parameter */
113#define	IP_FORWARDING		0x1		/* most of ip header exists */
114#define IP_MULTICASTOPTS	0x2		/* multicast opts present */
115#define	IP_ROUTETOIF		SO_DONTROUTE	/* bypass routing tables */
116#define	IP_ALLOWBROADCAST	SO_BROADCAST	/* can send broadcast packets */
117
118struct	ipstat	ipstat;
119struct	ipq	ipq;			/* ip reass. queue */
120u_short	ip_id;				/* ip packet ctr, for ids */
121
122struct	mbuf *ip_srcroute();
123#endif
124
125#endif /*!_netinet_ip_var_h*/
126