1 /* $OpenBSD: ip6_var.h,v 1.106 2022/11/12 02:49:34 kn Exp $ */
2 /* $KAME: ip6_var.h,v 1.33 2000/06/11 14:59:20 jinmei Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93
62 */
63
64 #ifndef _NETINET6_IP6_VAR_H_
65 #define _NETINET6_IP6_VAR_H_
66
67 /*
68 * IP6 reassembly queue structure. Each fragment
69 * being reassembled is attached to one of these structures.
70 */
71 struct ip6q {
72 TAILQ_ENTRY(ip6q) ip6q_queue;
73 LIST_HEAD(ip6asfrag_list, ip6asfrag) ip6q_asfrag;
74 struct in6_addr ip6q_src, ip6q_dst;
75 int ip6q_unfrglen; /* len of unfragmentable part */
76 int ip6q_nfrag; /* # of fragments */
77 u_int32_t ip6q_ident; /* fragment identification */
78 u_int8_t ip6q_nxt; /* ip6f_nxt in first fragment */
79 u_int8_t ip6q_ecn;
80 u_int8_t ip6q_ttl; /* time to live in slowtimo units */
81 };
82
83 struct ip6asfrag {
84 LIST_ENTRY(ip6asfrag) ip6af_list;
85 struct mbuf *ip6af_m;
86 int ip6af_offset; /* offset in ip6af_m to next header */
87 int ip6af_frglen; /* fragmentable part length */
88 int ip6af_off; /* fragment offset */
89 u_int16_t ip6af_mff; /* more fragment bit in frag off */
90 };
91
92 struct ip6_moptions {
93 LIST_HEAD(, in6_multi_mship) im6o_memberships;
94 unsigned short im6o_ifidx; /* ifp index for outgoing multicasts */
95 u_char im6o_hlim; /* hoplimit for outgoing multicasts */
96 u_char im6o_loop; /* 1 >= hear sends if a member */
97 };
98
99 /*
100 * Control options for outgoing packets
101 */
102
103 /* Routing header related info */
104 struct ip6po_rhinfo {
105 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
106 struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
107 };
108 #define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
109 #define ip6po_route ip6po_rhinfo.ip6po_rhi_route
110
111 struct ip6_pktopts {
112 /* Hoplimit for outgoing packets */
113 int ip6po_hlim;
114
115 /* Outgoing IF/address information */
116 struct in6_pktinfo *ip6po_pktinfo;
117
118 /* Hop-by-Hop options header */
119 struct ip6_hbh *ip6po_hbh;
120
121 /* Destination options header (before a routing header) */
122 struct ip6_dest *ip6po_dest1;
123
124 /* Routing header related info. */
125 struct ip6po_rhinfo ip6po_rhinfo;
126
127 /* Destination options header (after a routing header) */
128 struct ip6_dest *ip6po_dest2;
129
130 /* traffic class */
131 int ip6po_tclass;
132
133 /* fragment vs PMTU discovery policy */
134 int ip6po_minmtu;
135 #define IP6PO_MINMTU_MCASTONLY -1 /* default: send at min MTU for multicast */
136 #define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
137 #define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
138
139 int ip6po_flags;
140 #define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
141 };
142
143 struct ip6stat {
144 u_int64_t ip6s_total; /* total packets received */
145 u_int64_t ip6s_tooshort; /* packet too short */
146 u_int64_t ip6s_toosmall; /* not enough data */
147 u_int64_t ip6s_fragments; /* fragments received */
148 u_int64_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
149 u_int64_t ip6s_fragtimeout; /* fragments timed out */
150 u_int64_t ip6s_fragoverflow; /* fragments that exceeded limit */
151 u_int64_t ip6s_forward; /* packets forwarded */
152 u_int64_t ip6s_cantforward; /* packets rcvd for unreachable dest */
153 u_int64_t ip6s_redirectsent; /* packets forwarded on same net */
154 u_int64_t ip6s_delivered; /* datagrams delivered to upper level*/
155 u_int64_t ip6s_localout; /* total ip packets generated here */
156 u_int64_t ip6s_odropped; /* lost output due to nobufs, etc. */
157 u_int64_t ip6s_reassembled; /* total packets reassembled ok */
158 u_int64_t ip6s_fragmented; /* datagrams successfully fragmented */
159 u_int64_t ip6s_ofragments; /* output fragments created */
160 u_int64_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
161 u_int64_t ip6s_badoptions; /* error in option processing */
162 u_int64_t ip6s_noroute; /* packets discarded due to no route */
163 u_int64_t ip6s_badvers; /* ip6 version != 6 */
164 u_int64_t ip6s_rawout; /* total raw ip packets generated */
165 u_int64_t ip6s_badscope; /* scope error */
166 u_int64_t ip6s_notmember; /* don't join this multicast group */
167 u_int64_t ip6s_nxthist[256]; /* next header history */
168 u_int64_t ip6s_m1; /* one mbuf */
169 u_int64_t ip6s_m2m[32]; /* two or more mbuf */
170 u_int64_t ip6s_mext1; /* one ext mbuf */
171 u_int64_t ip6s_mext2m; /* two or more ext mbuf */
172 u_int64_t ip6s_nogif; /* no match gif found */
173 u_int64_t ip6s_toomanyhdr; /* discarded due to too many headers */
174
175 /*
176 * statistics for improvement of the source address selection
177 * algorithm:
178 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
179 */
180 /* number of times that address selection fails */
181 u_int64_t ip6s_sources_none;
182 /* number of times that an address on the outgoing I/F is chosen */
183 u_int64_t ip6s_sources_sameif[16];
184 /* number of times that an address on a non-outgoing I/F is chosen */
185 u_int64_t ip6s_sources_otherif[16];
186 /*
187 * number of times that an address that has the same scope
188 * from the destination is chosen.
189 */
190 u_int64_t ip6s_sources_samescope[16];
191 /*
192 * number of times that an address that has a different scope
193 * from the destination is chosen.
194 */
195 u_int64_t ip6s_sources_otherscope[16];
196 /* number of times that an deprecated address is chosen */
197 u_int64_t ip6s_sources_deprecated[16];
198
199 u_int64_t ip6s_forward_cachehit;
200 u_int64_t ip6s_forward_cachemiss;
201 u_int64_t ip6s_wrongif; /* packet received on wrong interface */
202 u_int64_t ip6s_idropped; /* lost input due to nobufs, etc. */
203 };
204
205 #ifdef _KERNEL
206
207 #include <sys/percpu.h>
208
209 enum ip6stat_counters {
210 ip6s_total,
211 ip6s_tooshort,
212 ip6s_toosmall,
213 ip6s_fragments,
214 ip6s_fragdropped,
215 ip6s_fragtimeout,
216 ip6s_fragoverflow,
217 ip6s_forward,
218 ip6s_cantforward,
219 ip6s_redirectsent,
220 ip6s_delivered,
221 ip6s_localout,
222 ip6s_odropped,
223 ip6s_reassembled,
224 ip6s_fragmented,
225 ip6s_ofragments,
226 ip6s_cantfrag,
227 ip6s_badoptions,
228 ip6s_noroute,
229 ip6s_badvers,
230 ip6s_rawout,
231 ip6s_badscope,
232 ip6s_notmember,
233 ip6s_nxthist,
234 ip6s_m1 = ip6s_nxthist + 256,
235 ip6s_m2m,
236 ip6s_mext1 = ip6s_m2m + 32,
237 ip6s_mext2m,
238 ip6s_nogif,
239 ip6s_toomanyhdr,
240 ip6s_sources_none,
241 ip6s_sources_sameif,
242 ip6s_sources_otherif = ip6s_sources_sameif + 16,
243 ip6s_sources_samescope = ip6s_sources_otherif + 16,
244 ip6s_sources_otherscope = ip6s_sources_samescope + 16,
245 ip6s_sources_deprecated = ip6s_sources_otherscope + 16,
246 ip6s_forward_cachehit = ip6s_sources_deprecated + 16,
247 ip6s_forward_cachemiss,
248 ip6s_wrongif,
249 ip6s_idropped,
250
251 ip6s_ncounters,
252 };
253
254 extern struct cpumem *ip6counters;
255
256 static inline void
257 ip6stat_inc(enum ip6stat_counters c)
258 {
259 counters_inc(ip6counters, c);
260 }
261
262 static inline void
263 ip6stat_add(enum ip6stat_counters c, uint64_t v)
264 {
265 counters_add(ip6counters, c, v);
266 }
267
268 /* flags passed to ip6_output as last parameter */
269 #define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
270 #define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
271 #define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
272
273 extern int ip6_mtudisc_timeout; /* mtu discovery */
274 extern struct rttimer_queue icmp6_mtudisc_timeout_q;
275
276 extern int ip6_defhlim; /* default hop limit */
277 extern int ip6_defmcasthlim; /* default multicast hop limit */
278 extern int ip6_forwarding; /* act as router? */
279 extern int ip6_mforwarding; /* act as multicast router? */
280 extern int ip6_multipath; /* use multipath routes */
281 extern int ip6_sendredirect; /* send ICMPv6 redirect? */
282 extern int ip6_use_deprecated; /* allow deprecated addr as source */
283 extern int ip6_mcast_pmtu; /* path MTU discovery for multicast */
284 extern int ip6_neighborgcthresh; /* Threshold # of NDP entries for GC */
285 extern int ip6_maxdynroutes; /* Max # of routes created via redirect */
286
287 extern struct socket *ip6_mrouter[RT_TABLEID_MAX + 1]; /* multicast routing daemon */
288 extern int ip6_sendredirects; /* send IP redirects when forwarding? */
289 extern int ip6_maxfragpackets; /* Maximum packets in reassembly queue */
290 extern int ip6_maxfrags; /* Maximum fragments in reassembly queue */
291 extern int ip6_log_interval;
292 extern time_t ip6_log_time;
293 extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
294 extern int ip6_dad_count; /* DupAddrDetectionTransmits */
295 extern int ip6_dad_pending; /* number of currently running DADs */
296
297 extern int ip6_auto_flowlabel;
298
299 #define IP6_SOIIKEY_LEN 16
300 extern uint8_t ip6_soiikey[IP6_SOIIKEY_LEN];
301
302 extern const struct pr_usrreqs rip6_usrreqs;
303
304 struct in6pcb;
305 struct inpcb;
306
307 int icmp6_ctloutput(int, struct socket *, int, int, struct mbuf *);
308
309 void ip6_init(void);
310 void ip6intr(void);
311 int ip6_input_if(struct mbuf **, int *, int, int, struct ifnet *);
312 void ip6_freepcbopts(struct ip6_pktopts *);
313 void ip6_freemoptions(struct ip6_moptions *);
314 int ip6_unknown_opt(struct mbuf **, u_int8_t *, int);
315 int ip6_get_prevhdr(struct mbuf *, int);
316 int ip6_nexthdr(struct mbuf *, int, int, int *);
317 int ip6_lasthdr(struct mbuf *, int, int, int *);
318 int ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
319 int ip6_process_hopopts(struct mbuf **, u_int8_t *, int, u_int32_t *,
320 u_int32_t *);
321 void ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
322 int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
323
324 void ip6_forward(struct mbuf *, struct rtentry *, int);
325
326 void ip6_mloopback(struct ifnet *, struct mbuf *, struct sockaddr_in6 *);
327 int ip6_output(struct mbuf *, struct ip6_pktopts *, struct route_in6 *, int,
328 struct ip6_moptions *, struct inpcb *);
329 int ip6_fragment(struct mbuf *, struct mbuf_list *, int, u_char, u_long);
330 int ip6_ctloutput(int, struct socket *, int, int, struct mbuf *);
331 int ip6_raw_ctloutput(int, struct socket *, int, int, struct mbuf *);
332 void ip6_initpktopts(struct ip6_pktopts *);
333 int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
334 struct ip6_pktopts *, int, int);
335 void ip6_clearpktopts(struct ip6_pktopts *, int);
336 void ip6_randomid_init(void);
337 u_int32_t ip6_randomid(void);
338 void ip6_send(struct mbuf *);
339
340 int route6_input(struct mbuf **, int *, int, int);
341
342 void frag6_init(void);
343 int frag6_input(struct mbuf **, int *, int, int);
344 int frag6_deletefraghdr(struct mbuf *, int);
345 void frag6_slowtimo(void);
346
347 void rip6_init(void);
348 int rip6_input(struct mbuf **, int *, int, int);
349 void rip6_ctlinput(int, struct sockaddr *, u_int, void *);
350 int rip6_ctloutput(int, struct socket *, int, int, struct mbuf *);
351 int rip6_output(struct mbuf *, struct socket *, struct sockaddr *,
352 struct mbuf *);
353 int rip6_attach(struct socket *, int, int);
354 int rip6_detach(struct socket *);
355 void rip6_lock(struct socket *);
356 void rip6_unlock(struct socket *);
357 int rip6_bind(struct socket *, struct mbuf *, struct proc *);
358 int rip6_connect(struct socket *, struct mbuf *);
359 int rip6_disconnect(struct socket *);
360 int rip6_shutdown(struct socket *);
361 int rip6_send(struct socket *, struct mbuf *, struct mbuf *,
362 struct mbuf *);
363 int rip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
364
365 int dest6_input(struct mbuf **, int *, int, int);
366 int none_input(struct mbuf **, int *, int);
367
368 int in6_pcbselsrc(struct in6_addr **, struct sockaddr_in6 *,
369 struct inpcb *, struct ip6_pktopts *);
370 int in6_selectsrc(struct in6_addr **, struct sockaddr_in6 *,
371 struct ip6_moptions *, unsigned int);
372 struct rtentry *in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
373 struct route_in6 *, unsigned int rtableid);
374
375 u_int32_t ip6_randomflowlabel(void);
376
377 #ifdef IPSEC
378 struct tdb;
379 int ip6_output_ipsec_lookup(struct mbuf *, struct inpcb *, struct tdb **);
380 int ip6_output_ipsec_send(struct tdb *, struct mbuf *, struct route_in6 *,
381 int, int);
382 #endif /* IPSEC */
383
384 #endif /* _KERNEL */
385
386 #endif /* !_NETINET6_IP6_VAR_H_ */
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