1/* $OpenBSD: ip6_var.h,v 1.129 2025/12/31 04:10:00 jsg 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
67struct ip6stat {
68 u_int64_t ip6s_total; /* total packets received */
69 u_int64_t ip6s_tooshort; /* packet too short */
70 u_int64_t ip6s_toosmall; /* not enough data */
71 u_int64_t ip6s_fragments; /* fragments received */
72 u_int64_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
73 u_int64_t ip6s_fragtimeout; /* fragments timed out */
74 u_int64_t ip6s_fragoverflow; /* fragments that exceeded limit */
75 u_int64_t ip6s_forward; /* packets forwarded */
76 u_int64_t ip6s_cantforward; /* packets rcvd for unreachable dest */
77 u_int64_t ip6s_redirectsent; /* packets forwarded on same net */
78 u_int64_t ip6s_delivered; /* datagrams delivered to upper level*/
79 u_int64_t ip6s_localout; /* total ip packets generated here */
80 u_int64_t ip6s_odropped; /* lost output due to nobufs, etc. */
81 u_int64_t ip6s_reassembled; /* total packets reassembled ok */
82 u_int64_t ip6s_fragmented; /* datagrams successfully fragmented */
83 u_int64_t ip6s_ofragments; /* output fragments created */
84 u_int64_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
85 u_int64_t ip6s_badoptions; /* error in option processing */
86 u_int64_t ip6s_noroute; /* packets discarded due to no route */
87 u_int64_t ip6s_badvers; /* ip6 version != 6 */
88 u_int64_t ip6s_rawout; /* total raw ip packets generated */
89 u_int64_t ip6s_badscope; /* scope error */
90 u_int64_t ip6s_notmember; /* don't join this multicast group */
91 u_int64_t ip6s_nxthist[256]; /* next header history */
92 u_int64_t ip6s_m1; /* one mbuf */
93 u_int64_t ip6s_m2m[32]; /* two or more mbuf */
94 u_int64_t ip6s_mext1; /* one ext mbuf */
95 u_int64_t ip6s_mext2m; /* two or more ext mbuf */
96 u_int64_t ip6s_nogif; /* no match gif found */
97 u_int64_t ip6s_toomanyhdr; /* discarded due to too many headers */
98
99 /*
100 * statistics for improvement of the source address selection
101 * algorithm:
102 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
103 */
104 /* number of times that address selection fails */
105 u_int64_t ip6s_sources_none;
106 /* number of times that an address on the outgoing I/F is chosen */
107 u_int64_t ip6s_sources_sameif[16];
108 /* number of times that an address on a non-outgoing I/F is chosen */
109 u_int64_t ip6s_sources_otherif[16];
110 /*
111 * number of times that an address that has the same scope
112 * from the destination is chosen.
113 */
114 u_int64_t ip6s_sources_samescope[16];
115 /*
116 * number of times that an address that has a different scope
117 * from the destination is chosen.
118 */
119 u_int64_t ip6s_sources_otherscope[16];
120 /* number of times that an deprecated address is chosen */
121 u_int64_t ip6s_sources_deprecated[16];
122
123 u_int64_t ip6s_rtcachehit; /* valid route found in cache */
124 u_int64_t ip6s_rtcachemiss; /* route cache with new destination */
125 u_int64_t ip6s_wrongif; /* packet received on wrong interface */
126 u_int64_t ip6s_idropped; /* lost input due to nobufs, etc. */
127};
128
129#ifdef _KERNEL
130
131/*
132 * IP6 reassembly queue structure. Each fragment
133 * being reassembled is attached to one of these structures.
134 */
135struct ip6q {
136 TAILQ_ENTRY(ip6q) ip6q_queue;
137 LIST_HEAD(ip6asfrag_list, ip6asfrag) ip6q_asfrag;
138 struct in6_addr ip6q_src, ip6q_dst;
139 int ip6q_unfrglen; /* len of unfragmentable part */
140 int ip6q_nfrag; /* # of fragments */
141 u_int32_t ip6q_ident; /* fragment identification */
142 u_int8_t ip6q_nxt; /* ip6f_nxt in first fragment */
143 u_int8_t ip6q_ecn;
144 u_int8_t ip6q_ttl; /* time to live in slowtimo units */
145};
146
147struct ip6asfrag {
148 LIST_ENTRY(ip6asfrag) ip6af_list;
149 struct mbuf *ip6af_m;
150 int ip6af_offset; /* offset in ip6af_m to next header */
151 int ip6af_frglen; /* fragmentable part length */
152 int ip6af_off; /* fragment offset */
153 u_int16_t ip6af_mff; /* more fragment bit in frag off */
154};
155
156struct ip6_moptions {
157 LIST_HEAD(, in6_multi_mship) im6o_memberships;
158 unsigned short im6o_ifidx; /* ifp index for outgoing multicasts */
159 u_char im6o_hlim; /* hoplimit for outgoing multicasts */
160 u_char im6o_loop; /* 1 >= hear sends if a member */
161};
162
163/*
164 * Control options for outgoing packets
165 */
166
167/* Routing header related info */
168struct ip6po_rhinfo {
169 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
170 struct route ip6po_rhi_route; /* Route to the 1st hop */
171};
172#define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
173#define ip6po_route ip6po_rhinfo.ip6po_rhi_route
174
175struct ip6_pktopts {
176 /* Hoplimit for outgoing packets */
177 int ip6po_hlim;
178
179 /* Outgoing IF/address information */
180 struct in6_pktinfo *ip6po_pktinfo;
181
182 /* Hop-by-Hop options header */
183 struct ip6_hbh *ip6po_hbh;
184
185 /* Destination options header (before a routing header) */
186 struct ip6_dest *ip6po_dest1;
187
188 /* Routing header related info. */
189 struct ip6po_rhinfo ip6po_rhinfo;
190
191 /* Destination options header (after a routing header) */
192 struct ip6_dest *ip6po_dest2;
193
194 /* traffic class */
195 int ip6po_tclass;
196
197 /* fragment vs PMTU discovery policy */
198 int ip6po_minmtu;
199#define IP6PO_MINMTU_MCASTONLY -1 /* default: send at min MTU for multicast */
200#define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
201#define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
202
203 int ip6po_flags;
204#define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
205};
206
207#include <sys/percpu.h>
208
209enum 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_rtcachehit = ip6s_sources_deprecated + 16,
247 ip6s_rtcachemiss,
248 ip6s_wrongif,
249 ip6s_idropped,
250
251 ip6s_ncounters,
252};
253
254extern struct cpumem *ip6counters;
255
256static inline void
257ip6stat_inc(enum ip6stat_counters c)
258{
259 counters_inc(ip6counters, c);
260}
261
262static inline void
263ip6stat_add(enum ip6stat_counters c, uint64_t v)
264{
265 counters_add(ip6counters, c, v);
266}
267
268/* flags passed to ip6_output or ip6_forward 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#define IPV6_REDIRECT 0x08 /* redirected by pf */
273#define IPV6_FORWARDING_IPSEC 0x10 /* only packets processed by IPsec */
274
275extern int ip6_mtudisc_timeout; /* mtu discovery */
276extern struct rttimer_queue icmp6_mtudisc_timeout_q;
277
278extern int ip6_defhlim; /* default hop limit */
279extern int ip6_defmcasthlim; /* default multicast hop limit */
280extern int ip6_forwarding; /* act as router? */
281extern int ip6_mforwarding; /* act as multicast router? */
282extern int ip6_multipath; /* use multipath routes */
283extern int ip6_mcast_pmtu; /* path MTU discovery for multicast */
284extern int ip6_neighborgcthresh; /* Threshold # of NDP entries for GC */
285extern int ip6_maxdynroutes; /* Max # of routes created via redirect */
286
287extern struct socket *ip6_mrouter[RT_TABLEID_MAX + 1]; /* multicast routing daemon */
288extern int ip6_sendredirects; /* send IP redirects when forwarding? */
289extern int ip6_maxfragpackets; /* Maximum packets in reassembly queue */
290extern int ip6_maxfrags; /* Maximum fragments in reassembly queue */
291extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
292extern int ip6_dad_count; /* DupAddrDetectionTransmits */
293extern int ip6_dad_pending; /* number of currently running DADs */
294
295extern const struct pr_usrreqs rip6_usrreqs;
296
297struct inpcb;
298struct ipsec_level;
299
300int icmp6_ctloutput(int, struct socket *, int, int, struct mbuf *);
301
302void ip6_init(void);
303void ip6intr(void);
304int ip6_input_if(struct mbuf **, int *, int, int, struct ifnet *,
305 struct netstack *);
306int ip6_ours_enqueue(struct mbuf **, int *, int);
307void ip6_freepcbopts(struct ip6_pktopts *);
308void ip6_freemoptions(struct ip6_moptions *);
309int ip6_unknown_opt(struct mbuf **, u_int8_t *, int);
310int ip6_get_prevhdr(struct mbuf *, int);
311int ip6_nexthdr(struct mbuf *, int, int, int *);
312int ip6_lasthdr(struct mbuf *, int, int, int *);
313int ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *, int);
314int ip6_process_hopopts(struct mbuf **, u_int8_t *, int, u_int32_t *,
315 u_int32_t *);
316void ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
317int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
318
319void ip6_forward(struct mbuf *, struct route *, int);
320
321void ip6_mloopback(struct ifnet *, struct mbuf *, struct sockaddr_in6 *);
322int ip6_output(struct mbuf *, struct ip6_pktopts *, struct route *, int,
323 struct ip6_moptions *, const struct ipsec_level *);
324int ip6_fragment(struct mbuf *, struct mbuf_list *, int, u_char, u_long);
325int ip6_ctloutput(int, struct socket *, int, int, struct mbuf *);
326int ip6_raw_ctloutput(int, struct socket *, int, int, struct mbuf *);
327void ip6_initpktopts(struct ip6_pktopts *);
328int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
329 struct ip6_pktopts *, int, int);
330void ip6_clearpktopts(struct ip6_pktopts *, int);
331void ip6_randomid_init(void);
332u_int32_t ip6_randomid(void);
333void ip6_send(struct mbuf *);
334
335int route6_input(struct mbuf **, int *, int, int, struct netstack *);
336
337void frag6_init(void);
338int frag6_input(struct mbuf **, int *, int, int, struct netstack *);
339int frag6_deletefraghdr(struct mbuf *, int);
340void frag6_slowtimo(void);
341
342void rip6_init(void);
343int rip6_input(struct mbuf **, int *, int, int, struct netstack *);
344void rip6_ctlinput(int, struct sockaddr *, u_int, void *);
345int rip6_ctloutput(int, struct socket *, int, int, struct mbuf *);
346int rip6_output(struct mbuf *, struct socket *, struct sockaddr *,
347 struct mbuf *);
348int rip6_attach(struct socket *, int, int);
349int rip6_detach(struct socket *);
350int rip6_bind(struct socket *, struct mbuf *, struct proc *);
351int rip6_connect(struct socket *, struct mbuf *);
352int rip6_disconnect(struct socket *);
353int rip6_shutdown(struct socket *);
354int rip6_send(struct socket *, struct mbuf *, struct mbuf *,
355 struct mbuf *);
356int rip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
357
358int dest6_input(struct mbuf **, int *, int, int, struct netstack *);
359
360int in6_pcbselsrc(const struct in6_addr **, const struct sockaddr_in6 *,
361 struct inpcb *, struct ip6_pktopts *);
362int in6_selectsrc(const struct in6_addr **, const struct sockaddr_in6 *,
363 struct ip6_moptions *, unsigned int);
364struct rtentry *in6_selectroute(const struct in6_addr *, struct ip6_pktopts *,
365 struct route *, unsigned int rtableid);
366
367u_int32_t ip6_randomflowlabel(void);
368
369#ifdef IPSEC
370struct tdb;
371int ip6_output_ipsec_lookup(struct mbuf *, const struct ipsec_level *,
372 struct tdb **);
373int ip6_output_ipsec_send(struct tdb *, struct mbuf *, struct route *,
374 u_int, int, int);
375#endif /* IPSEC */
376
377#endif /* _KERNEL */
378
379#endif /* !_NETINET6_IP6_VAR_H_ */