1/* $NetBSD: ip6_var.h,v 1.82 2019/05/13 07:47:59 ozaki-r 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#include <sys/socketvar.h>
68#include <net/route.h>
69
70struct ip6_moptions {
71 if_index_t im6o_multicast_if_index; /* I/F for outgoing multicasts */
72 u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
73 u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
74 LIST_HEAD(, in6_multi_mship) im6o_memberships;
75};
76
77/*
78 * Control options for outgoing packets
79 */
80
81/* Routing header related info */
82struct ip6po_rhinfo {
83 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
84 struct route ip6po_rhi_route; /* Route to the 1st hop */
85};
86#define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
87#define ip6po_route ip6po_rhinfo.ip6po_rhi_route
88
89/* Nexthop related info */
90struct ip6po_nhinfo {
91 struct sockaddr *ip6po_nhi_nexthop;
92 struct route ip6po_nhi_route; /* Route to the nexthop */
93};
94#define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
95#define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
96
97struct ip6_pktopts {
98 int ip6po_hlim; /* Hoplimit for outgoing packets */
99 struct in6_pktinfo *ip6po_pktinfo; /* Outgoing IF/address information */
100 struct ip6po_nhinfo ip6po_nhinfo; /* Next-hop address information */
101 struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
102 struct ip6_dest *ip6po_dest1; /* Destination options header(1st part) */
103 struct ip6po_rhinfo ip6po_rhinfo; /* Routing header related info. */
104 struct ip6_dest *ip6po_dest2; /* Destination options header(2nd part) */
105 int ip6po_tclass; /* traffic class */
106 int ip6po_minmtu; /* fragment vs PMTU discovery policy */
107#define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
108#define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
109#define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
110 int ip6po_prefer_tempaddr; /* whether temporary addresses are
111 * preferred as source address */
112#define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
113#define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
114#define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
115 int ip6po_flags;
116#if 0 /* parameters in this block is obsolete. do not reuse the values. */
117#define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
118#define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
119#endif
120#define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
121};
122
123/*
124 * IPv6 statistics.
125 * Each counter is an unsigned 64-bit value.
126 */
127#define IP6_STAT_TOTAL 0 /* total packets received */
128#define IP6_STAT_TOOSHORT 1 /* packet too short */
129#define IP6_STAT_TOOSMALL 2 /* not enough data */
130#define IP6_STAT_FRAGMENTS 3 /* fragments received */
131#define IP6_STAT_FRAGDROPPED 4 /* frags dropped (dups, out of space) */
132#define IP6_STAT_FRAGTIMEOUT 5 /* fragments timed out */
133#define IP6_STAT_FRAGOVERFLOW 6 /* fragments that exceed limit */
134#define IP6_STAT_FORWARD 7 /* packets forwarded */
135#define IP6_STAT_CANTFORWARD 8 /* packets rcvd for uncreachable dst */
136#define IP6_STAT_REDIRECTSENT 9 /* packets forwarded on same net */
137#define IP6_STAT_DELIVERED 10 /* datagrams delivered to upper level */
138#define IP6_STAT_LOCALOUT 11 /* total IP packets generated here */
139#define IP6_STAT_ODROPPED 12 /* lost packets due to nobufs, etc. */
140#define IP6_STAT_REASSEMBLED 13 /* total packets reassembled ok */
141#define IP6_STAT_FRAGMENTED 14 /* datagrams successfully fragmented */
142#define IP6_STAT_OFRAGMENTS 15 /* output fragments created */
143#define IP6_STAT_CANTFRAG 16 /* don't fragment flag was set, etc. */
144#define IP6_STAT_BADOPTIONS 17 /* error in option processing */
145#define IP6_STAT_NOROUTE 18 /* packets discarded due to no route */
146#define IP6_STAT_BADVERS 19 /* ip6 version != 6 */
147#define IP6_STAT_RAWOUT 20 /* total raw ip packets generated */
148#define IP6_STAT_BADSCOPE 21 /* scope error */
149#define IP6_STAT_NOTMEMBER 22 /* don't join this multicast group */
150#define IP6_STAT_NXTHIST 23 /* next header histogram */
151 /* space for 256 counters */
152#define IP6_STAT_M1 279 /* one mbuf */
153#define IP6_STAT_M2M 280 /* two or more mbuf */
154 /* space for 32 counters */
155#define IP6_STAT_MEXT1 312 /* one ext mbuf */
156#define IP6_STAT_MEXT2M 313 /* two or more ext mbuf */
157#define IP6_STAT_EXTHDRTOOLONG 314 /* ext hdr are not contiguous */
158#define IP6_STAT_NOGIF 315 /* no match gif found */
159#define IP6_STAT_TOOMANYHDR 316 /* discarded due to too many headers */
160 /*
161 * statistics for improvement of the source address selection
162 * algorithm:
163 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
164 */
165#define IP6_STAT_SOURCES_NONE 317 /* number of times that address
166 selection fails */
167#define IP6_STAT_SOURCES_SAMEIF 318 /* number of times that an address
168 on the outgoing I/F is chosen */
169 /* space for 16 counters */
170#define IP6_STAT_SOURCES_OTHERIF 334 /* number of times that an address on
171 a non-outgoing I/F is chosen */
172 /* space for 16 counters */
173#define IP6_STAT_SOURCES_SAMESCOPE 350 /* number of times that an address that
174 has the same scope from the dest.
175 is chosen */
176 /* space for 16 counters */
177#define IP6_STAT_SOURCES_OTHERSCOPE 366 /* number of times that an address that
178 has a different scope from the dest.
179 is chosen */
180 /* space for 16 counters */
181#define IP6_STAT_SOURCES_DEPRECATED 382 /* number of times that a deprecated
182 address is chosen */
183 /* space for 16 counters */
184#define IP6_STAT_FORWARD_CACHEHIT 398
185#define IP6_STAT_FORWARD_CACHEMISS 399
186#define IP6_STAT_FASTFORWARD 400 /* packets fast forwarded */
187#define IP6_STAT_FASTFORWARDFLOWS 401 /* number of fast forward flows */
188#define IP6_STAT_NOIPSEC 402 /* no match ipsec(4) found */
189#define IP6_STAT_PFILDROP_IN 403 /* dropped by pfil (PFIL_IN) */
190#define IP6_STAT_PFILDROP_OUT 404 /* dropped by pfil (PFIL_OUT) */
191
192#define IP6_NSTATS 405
193
194#define IP6FLOW_HASHBITS 6 /* should not be a multiple of 8 */
195
196/*
197 * Structure for an IPv6 flow (ip6_fastforward).
198 */
199struct ip6flow {
200 TAILQ_ENTRY(ip6flow) ip6f_list; /* next in active list */
201 TAILQ_ENTRY(ip6flow) ip6f_hash; /* next ip6flow in bucket */
202 size_t ip6f_hashidx; /* own hash index of ipflowtable[] */
203 struct in6_addr ip6f_dst; /* destination address */
204 struct in6_addr ip6f_src; /* source address */
205 struct route ip6f_ro; /* associated route entry */
206 u_int32_t ip6f_flow; /* flow (tos) */
207 u_quad_t ip6f_uses; /* number of uses in this period */
208 u_quad_t ip6f_last_uses; /* number of uses in last period */
209 u_quad_t ip6f_dropped; /* ENOBUFS returned by if_output */
210 u_quad_t ip6f_forwarded; /* packets forwarded */
211 u_int ip6f_timer; /* lifetime timer */
212};
213
214#ifdef _KERNEL
215/*
216 * Auxiliary attributes of incoming IPv6 packets, which is initialized when we
217 * come into ip6_input().
218 * XXX do not make it a kitchen sink!
219 */
220struct ip6aux {
221 /* ip6.ip6_dst */
222 struct in6_addr ip6a_src;
223 uint32_t ip6a_scope_id;
224 int ip6a_flags;
225};
226
227/* flags passed to ip6_output as last parameter */
228#define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
229#define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
230#define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
231
232extern u_int32_t ip6_id; /* fragment identifier */
233extern int ip6_defhlim; /* default hop limit */
234extern int ip6_defmcasthlim; /* default multicast hop limit */
235extern int ip6_forwarding; /* act as router? */
236extern int ip6_sendredirect; /* send ICMPv6 redirect? */
237extern int ip6_use_deprecated; /* allow deprecated addr as source */
238extern int ip6_rr_prune; /* router renumbering prefix
239 * walk list every 5 sec. */
240extern int ip6_mcast_pmtu; /* enable pMTU discovery for multicast? */
241extern int ip6_v6only;
242extern int ip6_neighborgcthresh; /* Threshold # of NDP entries for GC */
243extern int ip6_maxifprefixes; /* Max acceptable prefixes via RA per IF */
244extern int ip6_maxifdefrouters; /* Max acceptable def routers via RA */
245extern int ip6_maxdynroutes; /* Max # of routes created via redirect */
246
247
248extern struct socket *ip6_mrouter; /* multicast routing daemon */
249extern int ip6_sendredirects; /* send IP redirects when forwarding? */
250extern int ip6_maxfragpackets; /* Maximum packets in reassembly queue */
251extern int ip6_maxfrags; /* Maximum fragments in reassembly queue */
252extern int ip6_accept_rtadv; /* Acts as a host not a router */
253extern int ip6_rtadv_maxroutes; /* maximum number of routes via rtadv */
254extern int ip6_keepfaith; /* Firewall Aided Internet Translator */
255extern int ip6_log_interval;
256extern time_t ip6_log_time;
257extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
258extern int ip6_dad_count; /* DupAddrDetectionTransmits */
259
260extern int ip6_auto_flowlabel;
261extern int ip6_auto_linklocal;
262
263extern int ip6_anonportmin; /* minimum ephemeral port */
264extern int ip6_anonportmax; /* maximum ephemeral port */
265extern int ip6_lowportmin; /* minimum reserved port */
266extern int ip6_lowportmax; /* maximum reserved port */
267
268extern int ip6_use_tempaddr; /* whether to use temporary addresses. */
269extern int ip6_prefer_tempaddr; /* whether to prefer temporary addresses
270 in the source address selection */
271extern int ip6_use_defzone; /* whether to use the default scope zone
272 when unspecified */
273
274#ifdef GATEWAY
275extern int ip6_maxflows; /* maximum amount of flows for ip6ff */
276extern int ip6_hashsize; /* size of hash table */
277#endif
278
279struct in6pcb;
280extern const struct pr_usrreqs rip6_usrreqs;
281
282int icmp6_ctloutput(int, struct socket *, struct sockopt *);
283
284struct mbuf;
285void ip6_init(void);
286void ip6_input(struct mbuf *, struct ifnet *);
287const struct ip6aux *ip6_getdstifaddr(struct mbuf *);
288void ip6_freepcbopts(struct ip6_pktopts *);
289void ip6_freemoptions(struct ip6_moptions *);
290int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
291int ip6_get_prevhdr(struct mbuf *, int);
292int ip6_nexthdr(struct mbuf *, int, int, int *);
293int ip6_lasthdr(struct mbuf *, int, int, int *);
294
295struct m_tag *ip6_addaux(struct mbuf *);
296struct m_tag *ip6_findaux(struct mbuf *);
297void ip6_delaux(struct mbuf *);
298struct ip6_hdr;
299int ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
300int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
301void ip6_savecontrol(struct in6pcb *, struct mbuf **, struct ip6_hdr *,
302 struct mbuf *);
303void ip6_notify_pmtu(struct in6pcb *, const struct sockaddr_in6 *,
304 u_int32_t *);
305int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
306
307void ip6_forward(struct mbuf *, int);
308
309void ip6_mloopback(struct ifnet *, struct mbuf *,
310 const struct sockaddr_in6 *);
311int ip6_output(struct mbuf *, struct ip6_pktopts *, struct route *, int,
312 struct ip6_moptions *, struct in6pcb *, struct ifnet **);
313int ip6_if_output(struct ifnet * const, struct ifnet * const,
314 struct mbuf * const,
315 const struct sockaddr_in6 * const, const struct rtentry *);
316int ip6_ctloutput(int, struct socket *, struct sockopt *);
317int ip6_raw_ctloutput(int, struct socket *, struct sockopt *);
318void ip6_initpktopts(struct ip6_pktopts *);
319int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
320 struct ip6_pktopts *, kauth_cred_t, int);
321void ip6_clearpktopts(struct ip6_pktopts *, int);
322struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
323int ip6_optlen(struct in6pcb *);
324
325void ip6_statinc(u_int);
326
327int route6_input(struct mbuf **, int *, int);
328
329void frag6_init(void);
330int frag6_input(struct mbuf **, int *, int);
331int ip6_reass_packet(struct mbuf **, int);
332void frag6_slowtimo(void);
333void frag6_fasttimo(void);
334void frag6_drain(void);
335void frag6_drainstub(void);
336
337int ip6flow_init(int);
338void ip6flow_poolinit(void);
339struct ip6flow *ip6flow_reap(int);
340void ip6flow_create(struct route *, struct mbuf *);
341void ip6flow_slowtimo(void);
342int ip6flow_invalidate_all(int);
343
344void rip6_init(void);
345int rip6_input(struct mbuf **, int *, int);
346void *rip6_ctlinput(int, const struct sockaddr *, void *);
347int rip6_ctloutput(int, struct socket *, struct sockopt *);
348int rip6_output(struct mbuf *, struct socket *, struct sockaddr_in6 *,
349 struct mbuf *);
350int rip6_attach(struct socket *, int);
351int rip6_usrreq(struct socket *,
352 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
353
354int dest6_input(struct mbuf **, int *, int);
355int none_input(struct mbuf **, int *, int);
356
357struct route;
358
359int in6_selectsrc(struct sockaddr_in6 *, struct ip6_pktopts *,
360 struct ip6_moptions *, struct route *, struct in6_addr *,
361 struct ifnet **, struct psref *, struct in6_addr *);
362int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
363 struct route **, struct rtentry **, bool);
364int ip6_get_membership(const struct sockopt *, struct ifnet **,
365 struct psref *, void *, size_t);
366
367u_int32_t ip6_randomid(void);
368u_int32_t ip6_randomflowlabel(void);
369
370static inline bool
371ip6_dad_enabled(void)
372{
373
374 return ip6_dad_count > 0;
375}
376#endif /* _KERNEL */
377
378#endif /* !_NETINET6_IP6_VAR_H_ */
379