1/* $NetBSD: ip6_var.h,v 1.70 2016/11/10 04:13:53 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
70/*
71 * IP6 reassembly queue structure. Each fragment
72 * being reassembled is attached to one of these structures.
73 */
74struct ip6q {
75 u_int32_t ip6q_head;
76 u_int16_t ip6q_len;
77 u_int8_t ip6q_nxt; /* ip6f_nxt in first fragment */
78 u_int8_t ip6q_hlim;
79 struct ip6asfrag *ip6q_down;
80 struct ip6asfrag *ip6q_up;
81 u_int32_t ip6q_ident;
82 u_int8_t ip6q_arrive;
83 u_int8_t ip6q_ttl;
84 struct in6_addr ip6q_src, ip6q_dst;
85 struct ip6q *ip6q_next;
86 struct ip6q *ip6q_prev;
87 int ip6q_unfrglen; /* len of unfragmentable part */
88#ifdef notyet
89 u_char *ip6q_nxtp;
90#endif
91 int ip6q_nfrag; /* # of fragments */
92};
93
94struct ip6asfrag {
95 u_int32_t ip6af_head;
96 u_int16_t ip6af_len;
97 u_int8_t ip6af_nxt;
98 u_int8_t ip6af_hlim;
99 /* must not override the above members during reassembling */
100 struct ip6asfrag *ip6af_down;
101 struct ip6asfrag *ip6af_up;
102 struct mbuf *ip6af_m;
103 int ip6af_offset; /* offset in ip6af_m to next header */
104 int ip6af_frglen; /* fragmentable part length */
105 int ip6af_off; /* fragment offset */
106 u_int16_t ip6af_mff; /* more fragment bit in frag off */
107};
108
109#define IP6_REASS_MBUF(ip6af) ((ip6af)->ip6af_m)
110
111struct ip6_moptions {
112 if_index_t im6o_multicast_if_index; /* I/F for outgoing multicasts */
113 u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
114 u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
115 LIST_HEAD(, in6_multi_mship) im6o_memberships;
116};
117
118/*
119 * Control options for outgoing packets
120 */
121
122/* Routing header related info */
123struct ip6po_rhinfo {
124 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
125 struct route ip6po_rhi_route; /* Route to the 1st hop */
126};
127#define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
128#define ip6po_route ip6po_rhinfo.ip6po_rhi_route
129
130/* Nexthop related info */
131struct ip6po_nhinfo {
132 struct sockaddr *ip6po_nhi_nexthop;
133 struct route ip6po_nhi_route; /* Route to the nexthop */
134};
135#define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
136#define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
137
138struct ip6_pktopts {
139 int ip6po_hlim; /* Hoplimit for outgoing packets */
140 struct in6_pktinfo *ip6po_pktinfo; /* Outgoing IF/address information */
141 struct ip6po_nhinfo ip6po_nhinfo; /* Next-hop address information */
142 struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
143 struct ip6_dest *ip6po_dest1; /* Destination options header(1st part) */
144 struct ip6po_rhinfo ip6po_rhinfo; /* Routing header related info. */
145 struct ip6_dest *ip6po_dest2; /* Destination options header(2nd part) */
146 int ip6po_tclass; /* traffic class */
147 int ip6po_minmtu; /* fragment vs PMTU discovery policy */
148#define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
149#define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
150#define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
151 int ip6po_prefer_tempaddr; /* whether temporary addresses are
152 * preferred as source address */
153#define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
154#define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
155#define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
156 int ip6po_flags;
157#if 0 /* parameters in this block is obsolete. do not reuse the values. */
158#define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
159#define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
160#endif
161#define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
162};
163
164/*
165 * IPv6 statistics.
166 * Each counter is an unsigned 64-bit value.
167 */
168#define IP6_STAT_TOTAL 0 /* total packets received */
169#define IP6_STAT_TOOSHORT 1 /* packet too short */
170#define IP6_STAT_TOOSMALL 2 /* not enough data */
171#define IP6_STAT_FRAGMENTS 3 /* fragments received */
172#define IP6_STAT_FRAGDROPPED 4 /* frags dropped (dups, out of space) */
173#define IP6_STAT_FRAGTIMEOUT 5 /* fragments timed out */
174#define IP6_STAT_FRAGOVERFLOW 6 /* fragments that exceed limit */
175#define IP6_STAT_FORWARD 7 /* packets forwarded */
176#define IP6_STAT_CANTFORWARD 8 /* packets rcvd for uncreachable dst */
177#define IP6_STAT_REDIRECTSENT 9 /* packets forwarded on same net */
178#define IP6_STAT_DELIVERED 10 /* datagrams delivered to upper level */
179#define IP6_STAT_LOCALOUT 11 /* total IP packets generated here */
180#define IP6_STAT_ODROPPED 12 /* lost packets due to nobufs, etc. */
181#define IP6_STAT_REASSEMBLED 13 /* total packets reassembled ok */
182#define IP6_STAT_FRAGMENTED 14 /* datagrams successfully fragmented */
183#define IP6_STAT_OFRAGMENTS 15 /* output fragments created */
184#define IP6_STAT_CANTFRAG 16 /* don't fragment flag was set, etc. */
185#define IP6_STAT_BADOPTIONS 17 /* error in option processing */
186#define IP6_STAT_NOROUTE 18 /* packets discarded due to no route */
187#define IP6_STAT_BADVERS 19 /* ip6 version != 6 */
188#define IP6_STAT_RAWOUT 20 /* total raw ip packets generated */
189#define IP6_STAT_BADSCOPE 21 /* scope error */
190#define IP6_STAT_NOTMEMBER 22 /* don't join this multicast group */
191#define IP6_STAT_NXTHIST 23 /* next header histogram */
192 /* space for 256 counters */
193#define IP6_STAT_M1 279 /* one mbuf */
194#define IP6_STAT_M2M 280 /* two or more mbuf */
195 /* space for 32 counters */
196#define IP6_STAT_MEXT1 312 /* one ext mbuf */
197#define IP6_STAT_MEXT2M 313 /* two or more ext mbuf */
198#define IP6_STAT_EXTHDRTOOLONG 314 /* ext hdr are not contiguous */
199#define IP6_STAT_NOGIF 315 /* no match gif found */
200#define IP6_STAT_TOOMANYHDR 316 /* discarded due to too many headers */
201 /*
202 * statistics for improvement of the source address selection
203 * algorithm:
204 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
205 */
206#define IP6_STAT_SOURCES_NONE 317 /* number of times that address
207 selection fails */
208#define IP6_STAT_SOURCES_SAMEIF 318 /* number of times that an address
209 on the outgoing I/F is chosen */
210 /* space for 16 counters */
211#define IP6_STAT_SOURCES_OTHERIF 334 /* number of times that an address on
212 a non-outgoing I/F is chosen */
213 /* space for 16 counters */
214#define IP6_STAT_SOURCES_SAMESCOPE 350 /* number of times that an address that
215 has the same scope from the dest.
216 is chosen */
217 /* space for 16 counters */
218#define IP6_STAT_SOURCES_OTHERSCOPE 366 /* number of times that an address that
219 has a different scope from the dest.
220 is chosen */
221 /* space for 16 counters */
222#define IP6_STAT_SOURCES_DEPRECATED 382 /* number of times that a deprecated
223 address is chosen */
224 /* space for 16 counters */
225#define IP6_STAT_FORWARD_CACHEHIT 398
226#define IP6_STAT_FORWARD_CACHEMISS 399
227#define IP6_STAT_FASTFORWARD 400 /* packets fast forwarded */
228#define IP6_STAT_FASTFORWARDFLOWS 401 /* number of fast forward flows */
229
230#define IP6_NSTATS 402
231
232#define IP6FLOW_HASHBITS 6 /* should not be a multiple of 8 */
233
234/*
235 * Structure for an IPv6 flow (ip6_fastforward).
236 */
237struct ip6flow {
238 TAILQ_ENTRY(ip6flow) ip6f_list; /* next in active list */
239 TAILQ_ENTRY(ip6flow) ip6f_hash; /* next ip6flow in bucket */
240 size_t ip6f_hashidx; /* own hash index of ipflowtable[] */
241 struct in6_addr ip6f_dst; /* destination address */
242 struct in6_addr ip6f_src; /* source address */
243 struct route ip6f_ro; /* associated route entry */
244 u_int32_t ip6f_flow; /* flow (tos) */
245 u_quad_t ip6f_uses; /* number of uses in this period */
246 u_quad_t ip6f_last_uses; /* number of uses in last period */
247 u_quad_t ip6f_dropped; /* ENOBUFS returned by if_output */
248 u_quad_t ip6f_forwarded; /* packets forwarded */
249 u_int ip6f_timer; /* lifetime timer */
250};
251
252#ifdef _KERNEL
253/*
254 * Auxiliary attributes of incoming IPv6 packets, which is initialized when we
255 * come into ip6_input().
256 * XXX do not make it a kitchen sink!
257 */
258struct ip6aux {
259 /* ip6.ip6_dst */
260 struct in6_addr ip6a_src;
261 uint32_t ip6a_scope_id;
262 int ip6a_flags;
263};
264
265/* flags passed to ip6_output as last parameter */
266#define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
267#define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
268#define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
269
270extern u_int32_t ip6_id; /* fragment identifier */
271extern int ip6_defhlim; /* default hop limit */
272extern int ip6_defmcasthlim; /* default multicast hop limit */
273extern int ip6_forwarding; /* act as router? */
274extern int ip6_sendredirect; /* send ICMPv6 redirect? */
275extern int ip6_forward_srcrt; /* forward src-routed? */
276extern int ip6_use_deprecated; /* allow deprecated addr as source */
277extern int ip6_rr_prune; /* router renumbering prefix
278 * walk list every 5 sec. */
279extern int ip6_mcast_pmtu; /* enable pMTU discovery for multicast? */
280extern int ip6_v6only;
281extern int ip6_neighborgcthresh; /* Threshold # of NDP entries for GC */
282extern int ip6_maxifprefixes; /* Max acceptable prefixes via RA per IF */
283extern int ip6_maxifdefrouters; /* Max acceptable def routers via RA */
284extern int ip6_maxdynroutes; /* Max # of routes created via redirect */
285
286
287extern struct socket *ip6_mrouter; /* 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_sourcecheck; /* Verify source interface */
292extern int ip6_sourcecheck_interval; /* Interval between log messages */
293extern int ip6_accept_rtadv; /* Acts as a host not a router */
294extern int ip6_rtadv_maxroutes; /* maximum number of routes via rtadv */
295extern int ip6_keepfaith; /* Firewall Aided Internet Translator */
296extern int ip6_log_interval;
297extern time_t ip6_log_time;
298extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
299extern int ip6_dad_count; /* DupAddrDetectionTransmits */
300
301extern int ip6_auto_flowlabel;
302extern int ip6_auto_linklocal;
303
304extern int ip6_anonportmin; /* minimum ephemeral port */
305extern int ip6_anonportmax; /* maximum ephemeral port */
306extern int ip6_lowportmin; /* minimum reserved port */
307extern int ip6_lowportmax; /* maximum reserved port */
308
309extern int ip6_use_tempaddr; /* whether to use temporary addresses. */
310extern int ip6_prefer_tempaddr; /* whether to prefer temporary addresses
311 in the source address selection */
312extern int ip6_use_defzone; /* whether to use the default scope zone
313 when unspecified */
314
315#ifdef GATEWAY
316extern int ip6_maxflows; /* maximum amount of flows for ip6ff */
317extern int ip6_hashsize; /* size of hash table */
318#endif
319
320struct in6pcb;
321extern const struct pr_usrreqs rip6_usrreqs;
322
323int icmp6_ctloutput(int, struct socket *, struct sockopt *);
324
325struct mbuf;
326void ip6_init(void);
327void ip6_input(struct mbuf *, struct ifnet *);
328const struct ip6aux *ip6_getdstifaddr(struct mbuf *);
329void ip6_freepcbopts(struct ip6_pktopts *);
330void ip6_freemoptions(struct ip6_moptions *);
331int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
332u_int8_t *ip6_get_prevhdr(struct mbuf *, int);
333int ip6_nexthdr(struct mbuf *, int, int, int *);
334int ip6_lasthdr(struct mbuf *, int, int, int *);
335
336struct m_tag *ip6_addaux(struct mbuf *);
337struct m_tag *ip6_findaux(struct mbuf *);
338void ip6_delaux(struct mbuf *);
339struct ip6_hdr;
340int ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
341int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
342void ip6_savecontrol(struct in6pcb *, struct mbuf **, struct ip6_hdr *,
343 struct mbuf *);
344void ip6_notify_pmtu(struct in6pcb *, const struct sockaddr_in6 *,
345 u_int32_t *);
346int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
347
348void ip6_forward(struct mbuf *, int);
349
350void ip6_mloopback(struct ifnet *, struct mbuf *,
351 const struct sockaddr_in6 *);
352int ip6_output(struct mbuf *, struct ip6_pktopts *,
353 struct route *, int,
354 struct ip6_moptions *, struct socket *,
355 struct ifnet **);
356int ip6_ctloutput(int, struct socket *, struct sockopt *);
357int ip6_raw_ctloutput(int, struct socket *, struct sockopt *);
358void ip6_initpktopts(struct ip6_pktopts *);
359int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
360 struct ip6_pktopts *, kauth_cred_t, int);
361void ip6_clearpktopts(struct ip6_pktopts *, int);
362struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
363int ip6_optlen(struct in6pcb *);
364
365void ip6_statinc(u_int);
366
367int route6_input(struct mbuf **, int *, int);
368
369void frag6_init(void);
370int frag6_input(struct mbuf **, int *, int);
371int ip6_reass_packet(struct mbuf **, int);
372void frag6_slowtimo(void);
373void frag6_fasttimo(void);
374void frag6_drain(void);
375void frag6_drainstub(void);
376
377int ip6flow_init(int);
378void ip6flow_poolinit(void);
379struct ip6flow *ip6flow_reap(int);
380void ip6flow_create(const struct route *, struct mbuf *);
381void ip6flow_slowtimo(void);
382int ip6flow_invalidate_all(int);
383
384void rip6_init(void);
385int rip6_input(struct mbuf **, int *, int);
386void *rip6_ctlinput(int, const struct sockaddr *, void *);
387int rip6_ctloutput(int, struct socket *, struct sockopt *);
388int rip6_output(struct mbuf *, struct socket *, struct sockaddr_in6 *,
389 struct mbuf *);
390int rip6_attach(struct socket *, int);
391int rip6_usrreq(struct socket *,
392 int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
393
394int dest6_input(struct mbuf **, int *, int);
395int none_input(struct mbuf **, int *, int);
396
397struct route;
398
399int in6_selectsrc(struct sockaddr_in6 *, struct ip6_pktopts *,
400 struct ip6_moptions *, struct route *, struct in6_addr *,
401 struct ifnet **, struct psref *, struct in6_addr *);
402int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
403 struct route **, struct rtentry **, bool);
404int ip6_get_membership(const struct sockopt *, struct ifnet **, void *,
405 size_t);
406
407u_int32_t ip6_randomid(void);
408u_int32_t ip6_randomflowlabel(void);
409#endif /* _KERNEL */
410
411#endif /* !_NETINET6_IP6_VAR_H_ */
412