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33 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
34 * $FreeBSD: src/sys/netinet/in_var.h,v 1.33.2.3 2001/12/14 20:09:34 jlemon Exp $
35 * $DragonFly: src/sys/netinet/in_var.h,v 1.4 2003/08/23 11:18:00 rob Exp $
38 #ifndef _NETINET_IN_VAR_H_
39 #define _NETINET_IN_VAR_H_
41 #include <sys/queue.h>
42 #include <sys/fnv_hash.h>
45 * Interface address, Internet version. One of these structures
46 * is allocated for each Internet address on an interface.
47 * The ifaddr structure contains the protocol-independent part
48 * of the structure and is assumed to be first.
51 struct ifaddr ia_ifa; /* protocol-independent info */
52 #define ia_ifp ia_ifa.ifa_ifp
53 #define ia_flags ia_ifa.ifa_flags
54 /* ia_{,sub}net{,mask} in host order */
55 u_long ia_net; /* network number of interface */
56 u_long ia_netmask; /* mask of net part */
57 u_long ia_subnet; /* subnet number, including net */
58 u_long ia_subnetmask; /* mask of subnet part */
59 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
60 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */
61 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
62 struct sockaddr_in ia_addr; /* reserve space for interface name */
63 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
64 #define ia_broadaddr ia_dstaddr
65 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
69 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
70 struct sockaddr_in ifra_addr;
71 struct sockaddr_in ifra_broadaddr;
72 #define ifra_dstaddr ifra_broadaddr
73 struct sockaddr_in ifra_mask;
76 * Given a pointer to an in_ifaddr (ifaddr),
77 * return a pointer to the addr as a sockaddr_in.
79 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
80 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
82 #define IN_LNAOF(in, ifa) \
83 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
87 extern struct ifqueue ipintrq; /* ip packet input queue */
88 extern struct in_addr zeroin_addr;
89 extern u_char inetctlerrmap[];
92 * Hash table for IP addresses.
94 extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
95 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
96 extern u_long in_ifaddrhmask; /* mask for hash table */
98 #define INADDR_NHASH_LOG2 9
99 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
100 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
101 #define INADDR_HASH(x) \
102 (&in_ifaddrhashtbl[INADDR_HASHVAL(x) & in_ifaddrhmask])
106 * Macro for finding the interface (ifnet structure) corresponding to one
107 * of our IP addresses.
109 #define INADDR_TO_IFP(addr, ifp) \
110 /* struct in_addr addr; */ \
111 /* struct ifnet *ifp; */ \
113 struct in_ifaddr *ia; \
115 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
116 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
118 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
122 * Macro for finding the internet address structure (in_ifaddr) corresponding
123 * to a given interface (ifnet structure).
125 #define IFP_TO_IA(ifp, ia) \
126 /* struct ifnet *ifp; */ \
127 /* struct in_ifaddr *ia; */ \
129 for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
130 (ia) != NULL && (ia)->ia_ifp != (ifp); \
131 (ia) = TAILQ_NEXT((ia), ia_link)) \
137 * This information should be part of the ifnet structure but we don't wish
138 * to change that - as it might break a number of things
142 struct ifnet *rti_ifp;
143 int rti_type; /* type of router which is querier on this interface */
144 int rti_time; /* # of slow timeouts since last old query */
145 struct router_info *rti_next;
149 * Internet multicast address structure. There is one of these for each IP
150 * multicast group to which this host belongs on a given network interface.
151 * For every entry on the interface's if_multiaddrs list which represents
152 * an IP multicast group, there is one of these structures. They are also
153 * kept on a system-wide list to make it easier to keep our legacy IGMP code
154 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
157 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */
158 struct in_addr inm_addr; /* IP multicast address, convenience */
159 struct ifnet *inm_ifp; /* back pointer to ifnet */
160 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
161 u_int inm_timer; /* IGMP membership report timer */
162 u_int inm_state; /* state of the membership */
163 struct router_info *inm_rti; /* router info*/
169 SYSCTL_DECL(_net_inet_ip);
170 SYSCTL_DECL(_net_inet_raw);
173 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
176 * Structure used by macros below to remember position when stepping through
177 * all of the in_multi records.
179 struct in_multistep {
180 struct in_multi *i_inm;
184 * Macro for looking up the in_multi record for a given IP multicast address
185 * on a given interface. If no matching record is found, "inm" is set null.
187 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
188 /* struct in_addr addr; */ \
189 /* struct ifnet *ifp; */ \
190 /* struct in_multi *inm; */ \
192 struct ifmultiaddr *ifma; \
194 LIST_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
195 if (ifma->ifma_addr->sa_family == AF_INET \
196 && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
200 (inm) = ifma ? ifma->ifma_protospec : 0; \
204 * Macro to step through all of the in_multi records, one at a time.
205 * The current position is remembered in "step", which the caller must
206 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step"
207 * and get the first record. Both macros return a NULL "inm" when there
208 * are no remaining records.
210 #define IN_NEXT_MULTI(step, inm) \
211 /* struct in_multistep step; */ \
212 /* struct in_multi *inm; */ \
214 if (((inm) = (step).i_inm) != NULL) \
215 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
218 #define IN_FIRST_MULTI(step, inm) \
219 /* struct in_multistep step; */ \
220 /* struct in_multi *inm; */ \
222 (step).i_inm = LIST_FIRST(&in_multihead); \
223 IN_NEXT_MULTI((step), (inm)); \
227 struct in_multi *in_addmulti (struct in_addr *, struct ifnet *);
228 void in_delmulti (struct in_multi *);
229 int in_control (struct socket *, u_long, caddr_t, struct ifnet *,
231 void in_rtqdrain (void);
232 void ip_input (struct mbuf *);
233 int in_ifadown (struct ifaddr *ifa, int);
234 void in_ifscrub (struct ifnet *, struct in_ifaddr *);
235 int ipflow_fastforward (struct mbuf *);
236 void ipflow_create (const struct route *, struct mbuf *);
237 void ipflow_slowtimo (void);
242 #include <netinet6/in6_var.h>
244 #endif /* _NETINET_IN_VAR_H_ */