1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
32 */
33
34 /*-
35 * Copyright (c) 1982, 1986, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93
63 * $FreeBSD$
64 */
65
66 #ifndef _NETINET6_IP6_VAR_H_
67 #define _NETINET6_IP6_VAR_H_
68
69 #include <sys/epoch.h>
70
71 #ifdef _KERNEL
72 struct ip6asfrag; /* frag6.c */
73 TAILQ_HEAD(ip6fraghead, ip6asfrag);
74
75 /*
76 * IP6 reassembly queue structure. Each fragment
77 * being reassembled is attached to one of these structures.
78 */
79 struct ip6q {
80 struct ip6fraghead ip6q_frags;
81 u_int32_t ip6q_ident;
82 u_int8_t ip6q_nxt;
83 u_int8_t ip6q_ecn;
84 u_int8_t ip6q_ttl;
85 struct in6_addr ip6q_src, ip6q_dst;
86 TAILQ_ENTRY(ip6q) ip6q_tq;
87 int ip6q_unfrglen; /* len of unfragmentable part */
88 int ip6q_nfrag; /* # of fragments */
89 struct label *ip6q_label;
90 };
91 #endif /* _KERNEL */
92
93 /*
94 * IP6 reinjecting structure.
95 */
96 struct ip6_direct_ctx {
97 uint32_t ip6dc_nxt; /* next header to process */
98 uint32_t ip6dc_off; /* offset to next header */
99 };
100
101 #if defined(_NETINET6_IN6_VAR_H_) && defined(_KERNEL)
102 /*
103 * Structure attached to inpcb.in6p_moptions and
104 * passed to ip6_output when IPv6 multicast options are in use.
105 * This structure is lazy-allocated.
106 */
107 struct ip6_moptions {
108 struct ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
109 u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
110 u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
111 struct ip6_mfilter_head im6o_head; /* group membership list */
112 };
113 #else
114 struct ip6_moptions;
115 #endif
116 /*
117 * Control options for outgoing packets
118 */
119
120 /* Routing header related info */
121 struct ip6po_rhinfo {
122 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
123 struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
124 };
125 #define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
126 #define ip6po_route ip6po_rhinfo.ip6po_rhi_route
127
128 /* Nexthop related info */
129 struct ip6po_nhinfo {
130 struct sockaddr *ip6po_nhi_nexthop;
131 struct route_in6 ip6po_nhi_route; /* Route to the nexthop */
132 };
133 #define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
134 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
135
136 struct ip6_pktopts {
137 struct mbuf *ip6po_m; /* Pointer to mbuf storing the data */
138 int ip6po_hlim; /* Hoplimit for outgoing packets */
139
140 /* Outgoing IF/address information */
141 struct in6_pktinfo *ip6po_pktinfo;
142
143 /* Next-hop address information */
144 struct ip6po_nhinfo ip6po_nhinfo;
145
146 struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
147
148 /* Destination options header (before a routing header) */
149 struct ip6_dest *ip6po_dest1;
150
151 /* Routing header related info. */
152 struct ip6po_rhinfo ip6po_rhinfo;
153
154 /* Destination options header (after a routing header) */
155 struct ip6_dest *ip6po_dest2;
156
157 int ip6po_tclass; /* traffic class */
158
159 int ip6po_minmtu; /* fragment vs PMTU discovery policy */
160 #define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
161 #define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
162 #define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
163
164 int ip6po_prefer_tempaddr; /* whether temporary addresses are
165 preferred as source address */
166 #define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
167 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
168 #define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
169
170 int ip6po_flags;
171 #if 0 /* parameters in this block is obsolete. do not reuse the values. */
172 #define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
173 #define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
174 #endif
175 #define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
176 #define IP6PO_USECOA 0x08 /* use care of address */
177 };
178
179 /*
180 * Control options for incoming packets
181 */
182
183 struct ip6stat {
184 uint64_t ip6s_total; /* total packets received */
185 uint64_t ip6s_tooshort; /* packet too short */
186 uint64_t ip6s_toosmall; /* not enough data */
187 uint64_t ip6s_fragments; /* fragments received */
188 uint64_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
189 uint64_t ip6s_fragtimeout; /* fragments timed out */
190 uint64_t ip6s_fragoverflow; /* fragments that exceeded limit */
191 uint64_t ip6s_forward; /* packets forwarded */
192 uint64_t ip6s_cantforward; /* packets rcvd for unreachable dest */
193 uint64_t ip6s_redirectsent; /* packets forwarded on same net */
194 uint64_t ip6s_delivered; /* datagrams delivered to upper level*/
195 uint64_t ip6s_localout; /* total ip packets generated here */
196 uint64_t ip6s_odropped; /* lost packets due to nobufs, etc. */
197 uint64_t ip6s_reassembled; /* total packets reassembled ok */
198 uint64_t ip6s_atomicfrags; /* atomic fragments */
199 uint64_t ip6s_fragmented; /* datagrams successfully fragmented */
200 uint64_t ip6s_ofragments; /* output fragments created */
201 uint64_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
202 uint64_t ip6s_badoptions; /* error in option processing */
203 uint64_t ip6s_noroute; /* packets discarded due to no route */
204 uint64_t ip6s_badvers; /* ip6 version != 6 */
205 uint64_t ip6s_rawout; /* total raw ip packets generated */
206 uint64_t ip6s_badscope; /* scope error */
207 uint64_t ip6s_notmember; /* don't join this multicast group */
208 #define IP6S_HDRCNT 256 /* headers count */
209 uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
210 uint64_t ip6s_m1; /* one mbuf */
211 #define IP6S_M2MMAX 32
212 uint64_t ip6s_m2m[IP6S_M2MMAX]; /* two or more mbuf */
213 uint64_t ip6s_mext1; /* one ext mbuf */
214 uint64_t ip6s_mext2m; /* two or more ext mbuf */
215 uint64_t ip6s_exthdrtoolong; /* ext hdr are not contiguous */
216 uint64_t ip6s_nogif; /* no match gif found */
217 uint64_t ip6s_toomanyhdr; /* discarded due to too many headers */
218
219 /*
220 * statistics for improvement of the source address selection
221 * algorithm:
222 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
223 */
224 #define IP6S_RULESMAX 16
225 #define IP6S_SCOPECNT 16
226 /* number of times that address selection fails */
227 uint64_t ip6s_sources_none;
228 /* number of times that an address on the outgoing I/F is chosen */
229 uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
230 /* number of times that an address on a non-outgoing I/F is chosen */
231 uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
232 /*
233 * number of times that an address that has the same scope
234 * from the destination is chosen.
235 */
236 uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
237 /*
238 * number of times that an address that has a different scope
239 * from the destination is chosen.
240 */
241 uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
242 /* number of times that a deprecated address is chosen */
243 uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
244
245 /* number of times that each rule of source selection is applied. */
246 uint64_t ip6s_sources_rule[IP6S_RULESMAX];
247 };
248
249 #ifdef _KERNEL
250 #include <sys/counter.h>
251
252 VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
253 #define IP6STAT_ADD(name, val) \
254 VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
255 #define IP6STAT_SUB(name, val) IP6STAT_ADD(name, -(val))
256 #define IP6STAT_INC(name) IP6STAT_ADD(name, 1)
257 #define IP6STAT_DEC(name) IP6STAT_SUB(name, 1)
258 #endif
259
260 #ifdef _KERNEL
261 /* flags passed to ip6_output as last parameter */
262 #define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
263 #define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
264 #define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
265
266 #ifdef __NO_STRICT_ALIGNMENT
267 #define IP6_HDR_ALIGNED_P(ip) 1
268 #else
269 #define IP6_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
270 #endif
271
272 VNET_DECLARE(int, ip6_defhlim); /* default hop limit */
273 VNET_DECLARE(int, ip6_defmcasthlim); /* default multicast hop limit */
274 VNET_DECLARE(int, ip6_forwarding); /* act as router? */
275 VNET_DECLARE(int, ip6_use_deprecated); /* allow deprecated addr as source */
276 VNET_DECLARE(int, ip6_rr_prune); /* router renumbering prefix
277 * walk list every 5 sec. */
278 VNET_DECLARE(int, ip6_mcast_pmtu); /* enable pMTU discovery for multicast? */
279 VNET_DECLARE(int, ip6_v6only);
280 #define V_ip6_defhlim VNET(ip6_defhlim)
281 #define V_ip6_defmcasthlim VNET(ip6_defmcasthlim)
282 #define V_ip6_forwarding VNET(ip6_forwarding)
283 #define V_ip6_use_deprecated VNET(ip6_use_deprecated)
284 #define V_ip6_rr_prune VNET(ip6_rr_prune)
285 #define V_ip6_mcast_pmtu VNET(ip6_mcast_pmtu)
286 #define V_ip6_v6only VNET(ip6_v6only)
287
288 VNET_DECLARE(struct socket *, ip6_mrouter); /* multicast routing daemon */
289 VNET_DECLARE(int, ip6_sendredirects); /* send IP redirects when forwarding? */
290 VNET_DECLARE(int, ip6_accept_rtadv); /* Acts as a host not a router */
291 VNET_DECLARE(int, ip6_no_radr); /* No defroute from RA */
292 VNET_DECLARE(int, ip6_norbit_raif); /* Disable R-bit in NA on RA
293 * receiving IF. */
294 VNET_DECLARE(int, ip6_rfc6204w3); /* Accept defroute from RA even when
295 forwarding enabled */
296 VNET_DECLARE(int, ip6_log_interval);
297 VNET_DECLARE(time_t, ip6_log_time);
298 VNET_DECLARE(int, ip6_hdrnestlimit); /* upper limit of # of extension
299 * headers */
300 VNET_DECLARE(int, ip6_dad_count); /* DupAddrDetectionTransmits */
301 #define V_ip6_mrouter VNET(ip6_mrouter)
302 #define V_ip6_sendredirects VNET(ip6_sendredirects)
303 #define V_ip6_accept_rtadv VNET(ip6_accept_rtadv)
304 #define V_ip6_no_radr VNET(ip6_no_radr)
305 #define V_ip6_norbit_raif VNET(ip6_norbit_raif)
306 #define V_ip6_rfc6204w3 VNET(ip6_rfc6204w3)
307 #define V_ip6_log_interval VNET(ip6_log_interval)
308 #define V_ip6_log_time VNET(ip6_log_time)
309 #define V_ip6_hdrnestlimit VNET(ip6_hdrnestlimit)
310 #define V_ip6_dad_count VNET(ip6_dad_count)
311
312 VNET_DECLARE(int, ip6_auto_flowlabel);
313 VNET_DECLARE(int, ip6_auto_linklocal);
314 #define V_ip6_auto_flowlabel VNET(ip6_auto_flowlabel)
315 #define V_ip6_auto_linklocal VNET(ip6_auto_linklocal)
316
317 VNET_DECLARE(int, ip6_use_tempaddr); /* Whether to use temporary addresses */
318 VNET_DECLARE(int, ip6_prefer_tempaddr); /* Whether to prefer temporary
319 * addresses in the source address
320 * selection */
321 #define V_ip6_use_tempaddr VNET(ip6_use_tempaddr)
322 #define V_ip6_prefer_tempaddr VNET(ip6_prefer_tempaddr)
323
324 VNET_DECLARE(int, ip6_use_defzone); /* Whether to use the default scope
325 * zone when unspecified */
326 #define V_ip6_use_defzone VNET(ip6_use_defzone)
327
328 VNET_DECLARE (struct pfil_head, inet6_pfil_hook); /* packet filter hooks */
329 #define V_inet6_pfil_hook VNET(inet6_pfil_hook)
330 #ifdef IPSTEALTH
331 VNET_DECLARE(int, ip6stealth);
332 #define V_ip6stealth VNET(ip6stealth)
333 #endif
334
335 extern struct pr_usrreqs rip6_usrreqs;
336 struct sockopt;
337
338 struct inpcb;
339
340 int icmp6_ctloutput(struct socket *, struct sockopt *sopt);
341
342 struct in6_ifaddr;
343 void ip6_init(void);
344 int ip6proto_register(short);
345 int ip6proto_unregister(short);
346
347 void ip6_input(struct mbuf *);
348 void ip6_direct_input(struct mbuf *);
349 void ip6_freepcbopts(struct ip6_pktopts *);
350
351 int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
352 int ip6_get_prevhdr(const struct mbuf *, int);
353 int ip6_nexthdr(const struct mbuf *, int, int, int *);
354 int ip6_lasthdr(const struct mbuf *, int, int, int *);
355
356 extern int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
357 struct mbuf *);
358
359 int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
360 u_int32_t *);
361 struct mbuf **ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
362 struct mbuf **, int *);
363 void ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
364 void ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
365 int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
366
367 void ip6_forward(struct mbuf *, int);
368
369 void ip6_mloopback(struct ifnet *, struct mbuf *);
370 int ip6_output(struct mbuf *, struct ip6_pktopts *,
371 struct route_in6 *,
372 int,
373 struct ip6_moptions *, struct ifnet **,
374 struct inpcb *);
375 int ip6_ctloutput(struct socket *, struct sockopt *);
376 int ip6_raw_ctloutput(struct socket *, struct sockopt *);
377 void ip6_initpktopts(struct ip6_pktopts *);
378 int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
379 struct ip6_pktopts *, struct ucred *, int);
380 void ip6_clearpktopts(struct ip6_pktopts *, int);
381 struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
382 int ip6_optlen(struct inpcb *);
383 int ip6_deletefraghdr(struct mbuf *, int, int);
384 int ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
385 uint32_t);
386
387 int route6_input(struct mbuf **, int *, int);
388
389 void frag6_init(void);
390 void frag6_destroy(void);
391 int frag6_input(struct mbuf **, int *, int);
392 void frag6_slowtimo(void);
393 void frag6_drain(void);
394
395 void rip6_init(void);
396 int rip6_input(struct mbuf **, int *, int);
397 void rip6_ctlinput(int, struct sockaddr *, void *);
398 int rip6_ctloutput(struct socket *, struct sockopt *);
399 int rip6_output(struct mbuf *, struct socket *, ...);
400 int rip6_usrreq(struct socket *,
401 int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
402
403 int dest6_input(struct mbuf **, int *, int);
404 int none_input(struct mbuf **, int *, int);
405
406 int in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
407 struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
408 int in6_selectsrc_addr(uint32_t, const struct in6_addr *,
409 uint32_t, struct ifnet *, struct in6_addr *, int *);
410 int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
411 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
412 struct rtentry **);
413 int in6_selectroute_fib(struct sockaddr_in6 *, struct ip6_pktopts *,
414 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
415 struct rtentry **, u_int);
416 u_int32_t ip6_randomid(void);
417 u_int32_t ip6_randomflowlabel(void);
418 void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
419 #endif /* _KERNEL */
420
421 #endif /* !_NETINET6_IP6_VAR_H_ */
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