FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_var.h
1 /*
2 * Copyright (c) 1985, 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 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
34 * $FreeBSD$
35 */
36
37 #ifndef _NETINET_IN_VAR_H_
38 #define _NETINET_IN_VAR_H_
39
40 #include <sys/queue.h>
41
42 /*
43 * Interface address, Internet version. One of these structures
44 * is allocated for each Internet address on an interface.
45 * The ifaddr structure contains the protocol-independent part
46 * of the structure and is assumed to be first.
47 */
48 struct in_ifaddr {
49 struct ifaddr ia_ifa; /* protocol-independent info */
50 #define ia_ifp ia_ifa.ifa_ifp
51 #define ia_flags ia_ifa.ifa_flags
52 /* ia_{,sub}net{,mask} in host order */
53 u_long ia_net; /* network number of interface */
54 u_long ia_netmask; /* mask of net part */
55 u_long ia_subnet; /* subnet number, including net */
56 u_long ia_subnetmask; /* mask of subnet part */
57 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
58 TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */
59 struct sockaddr_in ia_addr; /* reserve space for interface name */
60 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
61 #define ia_broadaddr ia_dstaddr
62 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
63 };
64
65 struct in_aliasreq {
66 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
67 struct sockaddr_in ifra_addr;
68 struct sockaddr_in ifra_broadaddr;
69 #define ifra_dstaddr ifra_broadaddr
70 struct sockaddr_in ifra_mask;
71 };
72 /*
73 * Given a pointer to an in_ifaddr (ifaddr),
74 * return a pointer to the addr as a sockaddr_in.
75 */
76 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
77 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
78
79 #define IN_LNAOF(in, ifa) \
80 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
81
82
83 #ifdef KERNEL
84 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
85 extern struct ifqueue ipintrq; /* ip packet input queue */
86 extern struct in_addr zeroin_addr;
87 extern u_char inetctlerrmap[];
88
89 /*
90 * Macro for finding the interface (ifnet structure) corresponding to one
91 * of our IP addresses.
92 */
93 #define INADDR_TO_IFP(addr, ifp) \
94 /* struct in_addr addr; */ \
95 /* struct ifnet *ifp; */ \
96 { \
97 register struct in_ifaddr *ia; \
98 \
99 for (ia = in_ifaddrhead.tqh_first; \
100 ia != NULL && ((ia->ia_ifp->if_flags & IFF_POINTOPOINT)? \
101 IA_DSTSIN(ia):IA_SIN(ia))->sin_addr.s_addr != (addr).s_addr; \
102 ia = ia->ia_link.tqe_next) \
103 continue; \
104 if (ia == NULL) \
105 for (ia = in_ifaddrhead.tqh_first; \
106 ia != NULL; \
107 ia = ia->ia_link.tqe_next) \
108 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT && \
109 IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
110 break; \
111 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
112 }
113
114 /*
115 * Macro for finding the internet address structure (in_ifaddr) corresponding
116 * to a given interface (ifnet structure).
117 */
118 #define IFP_TO_IA(ifp, ia) \
119 /* struct ifnet *ifp; */ \
120 /* struct in_ifaddr *ia; */ \
121 { \
122 for ((ia) = in_ifaddrhead.tqh_first; \
123 (ia) != NULL && (ia)->ia_ifp != (ifp); \
124 (ia) = (ia)->ia_link.tqe_next) \
125 continue; \
126 }
127 #endif
128
129 /*
130 * This information should be part of the ifnet structure but we don't wish
131 * to change that - as it might break a number of things
132 */
133
134 struct router_info {
135 struct ifnet *rti_ifp;
136 int rti_type; /* type of router which is querier on this interface */
137 int rti_time; /* # of slow timeouts since last old query */
138 struct router_info *rti_next;
139 };
140
141 /*
142 * Internet multicast address structure. There is one of these for each IP
143 * multicast group to which this host belongs on a given network interface.
144 * For every entry on the interface's if_multiaddrs list which represents
145 * an IP multicast group, there is one of these structures. They are also
146 * kept on a system-wide list to make it easier to keep our legacy IGMP code
147 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
148 */
149 struct in_multi {
150 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */
151 struct in_addr inm_addr; /* IP multicast address, convenience */
152 struct ifnet *inm_ifp; /* back pointer to ifnet */
153 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
154 u_int inm_timer; /* IGMP membership report timer */
155 u_int inm_state; /* state of the membership */
156 struct router_info *inm_rti; /* router info*/
157 };
158
159 #ifdef KERNEL
160 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
161
162 /*
163 * Structure used by macros below to remember position when stepping through
164 * all of the in_multi records.
165 */
166 struct in_multistep {
167 struct in_multi *i_inm;
168 };
169
170 /*
171 * Macro for looking up the in_multi record for a given IP multicast address
172 * on a given interface. If no matching record is found, "inm" is set null.
173 */
174 #define IN_LOOKUP_MULTI(addr, ifp, inm) \
175 /* struct in_addr addr; */ \
176 /* struct ifnet *ifp; */ \
177 /* struct in_multi *inm; */ \
178 do { \
179 register struct ifmultiaddr *ifma; \
180 \
181 for (ifma = (ifp)->if_multiaddrs.lh_first; ifma; \
182 ifma = ifma->ifma_link.le_next) { \
183 if (ifma->ifma_addr->sa_family == AF_INET \
184 && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
185 (addr).s_addr) \
186 break; \
187 } \
188 (inm) = ifma ? ifma->ifma_protospec : 0; \
189 } while(0)
190
191 /*
192 * Macro to step through all of the in_multi records, one at a time.
193 * The current position is remembered in "step", which the caller must
194 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step"
195 * and get the first record. Both macros return a NULL "inm" when there
196 * are no remaining records.
197 */
198 #define IN_NEXT_MULTI(step, inm) \
199 /* struct in_multistep step; */ \
200 /* struct in_multi *inm; */ \
201 do { \
202 if (((inm) = (step).i_inm) != NULL) \
203 (step).i_inm = (step).i_inm->inm_link.le_next; \
204 } while(0)
205
206 #define IN_FIRST_MULTI(step, inm) \
207 /* struct in_multistep step; */ \
208 /* struct in_multi *inm; */ \
209 do { \
210 (step).i_inm = in_multihead.lh_first; \
211 IN_NEXT_MULTI((step), (inm)); \
212 } while(0)
213
214 struct route;
215 struct in_multi *in_addmulti __P((struct in_addr *, struct ifnet *));
216 void in_delmulti __P((struct in_multi *));
217 int in_control __P((struct socket *, u_long, caddr_t, struct ifnet *,
218 struct proc *));
219 void in_rtqdrain __P((void));
220 void ip_input __P((struct mbuf *));
221 int in_ifadown __P((struct ifaddr *ifa));
222 void in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
223 int ipflow_fastforward __P((struct mbuf *));
224 void ipflow_create __P((const struct route *, struct mbuf *));
225 void ipflow_slowtimo __P((void));
226
227 #endif /* KERNEL */
228
229 #endif /* _NETINET_IN_VAR_H_ */
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