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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
30 * $FreeBSD: src/sys/netinet/in_var.h,v 1.33.2.3 2001/12/14 20:09:34 jlemon Exp $
31 */
32
33 #ifndef _NETINET_IN_VAR_H_
34 #define _NETINET_IN_VAR_H_
35
36 #ifndef _SYS_QUEUE_H_
37 #include <sys/queue.h>
38 #endif
39 #ifndef _NET_IF_VAR_H_
40 #include <net/if_var.h>
41 #endif
42 #ifndef _NETINET_IN_H_
43 #include <netinet/in.h>
44 #endif
45
46 /*
47 * Interface address, Internet version. One of these structures
48 * is allocated for each Internet address on an interface.
49 * The ifaddr structure contains the protocol-independent part
50 * of the structure and is assumed to be first.
51 */
52 struct in_ifaddr {
53 struct ifaddr ia_ifa; /* protocol-independent info */
54 #define ia_ifp ia_ifa.ifa_ifp
55 #define ia_flags ia_ifa.ifa_flags
56 /* ia_{,sub}net{,mask} in host order */
57 u_long ia_net; /* network number of interface */
58 u_long ia_netmask; /* mask of net part */
59 u_long ia_subnet; /* subnet number, including net */
60 u_long ia_subnetmask; /* mask of subnet part */
61 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
62 void *ia_pad1[2];
63 void *ia_pad2[2];
64 struct sockaddr_in ia_addr; /* reserve space for interface name */
65 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
66 #define ia_broadaddr ia_dstaddr
67 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
68 };
69
70 struct in_aliasreq {
71 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
72 struct sockaddr_in ifra_addr;
73 struct sockaddr_in ifra_broadaddr;
74 #define ifra_dstaddr ifra_broadaddr
75 struct sockaddr_in ifra_mask;
76 };
77
78 /*
79 * Given a pointer to an in_ifaddr (ifaddr),
80 * return a pointer to the addr as a sockaddr_in.
81 */
82 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
83 #if 0
84 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
85
86 #define IN_LNAOF(in, ifa) \
87 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
88 #endif
89
90
91 #ifdef _KERNEL
92 #include <sys/fnv_hash.h>
93
94 struct in_ifaddr_container;
95
96 extern struct in_addr zeroin_addr;
97 extern u_char inetctlerrmap[];
98
99 /*
100 * Hash table for IP addresses.
101 */
102 extern LIST_HEAD(in_ifaddrhashhead, in_ifaddr_container) *in_ifaddrhashtbls[];
103 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr_container) in_ifaddrheads[];
104 extern u_long in_ifaddrhmask; /* mask for hash table */
105
106 #define INADDR_NHASH_LOG2 9
107 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
108 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
109 #define INADDR_HASH(x) \
110 (&in_ifaddrhashtbls[mycpuid][INADDR_HASHVAL(x) & in_ifaddrhmask])
111
112
113 /*
114 * Function for finding the interface (ifnet structure) corresponding to one
115 * of our IP addresses.
116 */
117 static __inline struct ifnet *
INADDR_TO_IFP(const struct in_addr * _addr)118 INADDR_TO_IFP(const struct in_addr *_addr)
119 {
120 struct in_ifaddr_container *_iac;
121
122 LIST_FOREACH(_iac, INADDR_HASH(_addr->s_addr), ia_hash) {
123 if (IA_SIN(_iac->ia)->sin_addr.s_addr == _addr->s_addr)
124 return _iac->ia->ia_ifp;
125 }
126 return NULL;
127 }
128
129 /*
130 * Function for finding the internet address structure (in_ifaddr) corresponding
131 * to a given interface (ifnet structure).
132 */
133 static __inline struct in_ifaddr *
IFP_TO_IA(const struct ifnet * _ifp)134 IFP_TO_IA(const struct ifnet *_ifp)
135 {
136 struct in_ifaddr_container *_iac;
137
138 TAILQ_FOREACH(_iac, &in_ifaddrheads[mycpuid], ia_link)
139 if (_iac->ia->ia_ifp == _ifp)
140 return _iac->ia;
141 return NULL;
142 }
143
144 #endif /* _KERNEL */
145
146 #ifdef _KERNEL
147 /*
148 * This information should be part of the ifnet structure but we don't wish
149 * to change that - as it might break a number of things
150 */
151
152 struct router_info {
153 struct ifnet *rti_ifp;
154 int rti_type; /* type of router which is querier on this interface */
155 int rti_time; /* # of slow timeouts since last old query */
156 struct router_info *rti_next;
157 };
158
159 /*
160 * Internet multicast address structure. There is one of these for each IP
161 * multicast group to which this host belongs on a given network interface.
162 * For every entry on the interface's if_multiaddrs list which represents
163 * an IP multicast group, there is one of these structures. They are also
164 * kept on a system-wide list to make it easier to keep our legacy IGMP code
165 * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
166 */
167 struct in_multi {
168 LIST_ENTRY(in_multi) inm_link; /* queue macro glue */
169 struct in_addr inm_addr; /* IP multicast address, convenience */
170 struct ifnet *inm_ifp; /* back pointer to ifnet */
171 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
172 u_int inm_timer; /* IGMP membership report timer */
173 u_int inm_state; /* state of the membership */
174 struct router_info *inm_rti; /* router info*/
175 };
176 #endif /* _KERNEL */
177
178 #ifdef _KERNEL
179
180 #ifdef SYSCTL_DECL
181 SYSCTL_DECL(_net_inet_ip);
182 SYSCTL_DECL(_net_inet_raw);
183 #endif
184
185 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
186
187 /*
188 * Structure used by macros below to remember position when stepping through
189 * all of the in_multi records.
190 */
191 struct in_multistep {
192 struct in_multi *i_inm;
193 };
194
195 /*
196 * Look up the in_multi record for a given IP multicast address on a given
197 * interface. If no matching record is found, NULL is returned.
198 */
199 static __inline struct in_multi *
IN_LOOKUP_MULTI(const struct in_addr * _addr,struct ifnet * _ifp)200 IN_LOOKUP_MULTI(const struct in_addr *_addr, struct ifnet *_ifp)
201 {
202 const struct ifmultiaddr *_ifma;
203 struct in_multi *_inm = NULL;
204
205 if (_ifp == NULL)
206 return NULL;
207
208 /* TODO: need ifnet_serialize_main */
209 ifnet_serialize_all(_ifp);
210 TAILQ_FOREACH(_ifma, &_ifp->if_multiaddrs, ifma_link) {
211 if (_ifma->ifma_addr->sa_family == AF_INET &&
212 ((struct sockaddr_in *)_ifma->ifma_addr)->sin_addr.s_addr ==
213 _addr->s_addr) {
214 _inm = _ifma->ifma_protospec;
215 break;
216 }
217 }
218 ifnet_deserialize_all(_ifp);
219
220 return _inm;
221 }
222
223 /*
224 * Macro to step through all of the in_multi records, one at a time.
225 * The current position is remembered in "step", which the caller must
226 * provide. IN_FIRST_MULTI(), below, must be called to initialize "step"
227 * and get the first record. Both macros return a NULL "inm" when there
228 * are no remaining records.
229 */
230 #define IN_NEXT_MULTI(step, inm) \
231 /* struct in_multistep step; */ \
232 /* struct in_multi *inm; */ \
233 do { \
234 if (((inm) = (step).i_inm) != NULL) \
235 (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
236 } while(0)
237
238 #define IN_FIRST_MULTI(step, inm) \
239 /* struct in_multistep step; */ \
240 /* struct in_multi *inm; */ \
241 do { \
242 (step).i_inm = LIST_FIRST(&in_multihead); \
243 IN_NEXT_MULTI((step), (inm)); \
244 } while(0)
245
246 struct route;
247 struct lwkt_serialize;
248 union netmsg;
249
250 void in_ifdetach(struct ifnet *ifp);
251 void in_if_down(struct ifnet *ifp);
252 struct in_multi *in_addmulti (struct in_addr *, struct ifnet *);
253 void in_delmulti (struct in_multi *);
254 int in_control (u_long, caddr_t, struct ifnet *, struct thread *);
255 void in_control_dispatch(union netmsg *);
256 void in_rtqdrain (void);
257 void ip_input (struct mbuf *);
258 void ip_forward (struct mbuf *, boolean_t, struct sockaddr_in *);
259 int in_ifadown (struct ifaddr *ifa, int);
260 int in_ifadown_force (struct ifaddr *ifa, int);
261 void in_ifscrub (struct ifnet *, struct in_ifaddr *);
262 void in_iaunlink (struct in_ifaddr *);
263 void in_iahash_insert (struct in_ifaddr *);
264 void in_iahash_remove (struct in_ifaddr *);
265
266 #endif /* _KERNEL */
267
268 /* INET6 stuff */
269 #include <netinet6/in6_var.h>
270
271 #endif /* _NETINET_IN_VAR_H_ */
272