1/*	$FreeBSD$	*/
2
3/*	@(#)in_var.h 1.3 88/08/19 SMI; from UCB 7.1 6/5/86	*/
4
5/*
6 * Copyright (c) 1985, 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 * Interface address, Internet version.  One of these structures
13 * is allocated for each interface with an Internet address.
14 * The ifaddr structure contains the protocol-independent part
15 * of the structure and is assumed to be first.
16 */
17
18#ifndef _netinet_in_var_h
19#define _netinet_in_var_h
20
21struct in_ifaddr {
22	struct	ifaddr ia_ifa;		/* protocol-independent info */
23#define	ia_addr	ia_ifa.ifa_addr
24#define	ia_broadaddr	ia_ifa.ifa_broadaddr
25#define	ia_dstaddr	ia_ifa.ifa_dstaddr
26#define	ia_ifp		ia_ifa.ifa_ifp
27	u_long	ia_net;			/* network number of interface */
28	u_long	ia_netmask;		/* mask of net part */
29	u_long	ia_subnet;		/* subnet number, including net */
30	u_long	ia_subnetmask;		/* mask of net + subnet */
31	struct	in_addr ia_netbroadcast; /* broadcast addr for (logical) net */
32	int	ia_flags;
33	struct	in_ifaddr *ia_next;	/* next in list of internet addresses */
34	struct	in_multi *ia_multiaddrs;/* list of multicast addresses */
35};
36/*
37 * Given a pointer to an in_ifaddr (ifaddr),
38 * return a pointer to the addr as a sockadd_in.
39 */
40#define	IA_SIN(ia) ((struct sockaddr_in *)(&((struct in_ifaddr *)ia)->ia_addr))
41/*
42 * ia_flags
43 */
44#define	IFA_ROUTE	0x01		/* routing entry installed */
45
46#ifdef	KERNEL
47struct	in_ifaddr *in_ifaddr;
48struct	in_ifaddr *in_iaonnetof();
49struct	ifqueue	ipintrq;		/* ip packet input queue */
50#endif
51
52#ifdef KERNEL
53/*
54 * Macro for finding the interface (ifnet structure) corresponding to one
55 * of our IP addresses.
56 */
57#define INADDR_TO_IFP(addr, ifp)					  \
58	/* struct in_addr addr; */					  \
59	/* struct ifnet  *ifp;  */					  \
60{									  \
61	register struct in_ifaddr *ia;					  \
62									  \
63	for (ia = in_ifaddr;						  \
64	     ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr;  \
65	     ia = ia->ia_next);						  \
66	(ifp) = (ia == NULL) ? NULL : ia->ia_ifp;			  \
67}
68
69/*
70 * Macro for finding the internet address structure (in_ifaddr) corresponding
71 * to a given interface (ifnet structure).
72 */
73#define IFP_TO_IA(ifp, ia)						  \
74	/* struct ifnet     *ifp; */					  \
75	/* struct in_ifaddr *ia;  */					  \
76{									  \
77	for ((ia) = in_ifaddr;						  \
78	     (ia) != NULL && (ia)->ia_ifp != (ifp);			  \
79	     (ia) = (ia)->ia_next);					  \
80}
81#endif /* KERNEL */
82
83/*
84 * Per-interface router version information is kept in this list.
85 * This information should be part of the ifnet structure but we don't wish
86 * to change that - as it might break a number of things
87 */
88
89struct router_info {
90	struct ifnet *ifp;
91	int    type; /* type of router which is querier on this interface */
92	int    time; /* # of slow timeouts since last old query */
93	struct router_info *next;
94};
95
96/*
97 * Internet multicast address structure.  There is one of these for each IP
98 * multicast group to which this host belongs on a given network interface.
99 * They are kept in a linked list, rooted in the interface's in_ifaddr
100 * structure.
101 */
102
103struct in_multi {
104	struct in_addr	   inm_addr;	/* IP multicast address             */
105	struct ifnet      *inm_ifp;	/* back pointer to ifnet            */
106	struct in_ifaddr  *inm_ia;	/* back pointer to in_ifaddr        */
107	u_int		   inm_refcount;/* no. membership claims by sockets */
108	u_int		   inm_timer;	/* IGMP membership report timer     */
109	struct in_multi   *inm_next;	/* ptr to next multicast address    */
110	u_int              inm_state;   /*  state of the membership */
111	struct router_info *inm_rti;     /* router info*/
112};
113
114#ifdef KERNEL
115/*
116 * Structure used by macros below to remember position when stepping through
117 * all of the in_multi records.
118 */
119struct in_multistep {
120	struct in_ifaddr *i_ia;
121	struct in_multi  *i_inm;
122};
123
124/*
125 * Macro for looking up the in_multi record for a given IP multicast address
126 * on a given interface.  If no matching record is found, "inm" returns NULL.
127 */
128#define IN_LOOKUP_MULTI(addr, ifp, inm)					    \
129	/* struct in_addr  addr; */					    \
130	/* struct ifnet    *ifp; */					    \
131	/* struct in_multi *inm; */					    \
132{									    \
133	register struct in_ifaddr *ia;					    \
134									    \
135	IFP_TO_IA((ifp), ia);						    \
136	if (ia == NULL)							    \
137		(inm) = NULL;						    \
138	else								    \
139	    for ((inm) = ia->ia_multiaddrs;				    \
140		 (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr;  \
141		 (inm) = inm->inm_next);				    \
142}
143
144/*
145 * Macro to step through all of the in_multi records, one at a time.
146 * The current position is remembered in "step", which the caller must
147 * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
148 * and get the first record.  Both macros return a NULL "inm" when there
149 * are no remaining records.
150 */
151#define IN_NEXT_MULTI(step, inm)					\
152	/* struct in_multistep  step; */				\
153	/* struct in_multi     *inm;  */				\
154{									\
155	if (((inm) = (step).i_inm) != NULL) {				\
156		(step).i_inm = (inm)->inm_next;				\
157	}								\
158	else while ((step).i_ia != NULL) {				\
159		(inm) = (step).i_ia->ia_multiaddrs;			\
160		(step).i_ia = (step).i_ia->ia_next;			\
161		if ((inm) != NULL) {					\
162			(step).i_inm = (inm)->inm_next;			\
163			break;						\
164		}							\
165	}								\
166}
167
168#define IN_FIRST_MULTI(step, inm)					\
169	/* struct in_multistep  step; */				\
170	/* struct in_multi     *inm;  */				\
171{									\
172	(step).i_ia  = in_ifaddr;					\
173	(step).i_inm = NULL;						\
174	IN_NEXT_MULTI((step), (inm));					\
175}
176
177struct in_multi *in_addmulti();
178#endif /* KERNEL */
179#endif /*!_netinet_in_var_h*/
180