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: releng/12.0/sys/netinet6/ip6_var.h 337783 2018-08-14 17:27:41Z jtl $
64 */
65
66 #ifndef _NETINET6_IP6_VAR_H_
67 #define _NETINET6_IP6_VAR_H_
68
69 #include <sys/epoch.h>
70
71 /*
72 * IP6 reassembly queue structure. Each fragment
73 * being reassembled is attached to one of these structures.
74 */
75 struct ip6q {
76 struct ip6asfrag *ip6q_down;
77 struct ip6asfrag *ip6q_up;
78 u_int32_t ip6q_ident;
79 u_int8_t ip6q_nxt;
80 u_int8_t ip6q_ecn;
81 u_int8_t ip6q_ttl;
82 struct in6_addr ip6q_src, ip6q_dst;
83 struct ip6q *ip6q_next;
84 struct ip6q *ip6q_prev;
85 int ip6q_unfrglen; /* len of unfragmentable part */
86 #ifdef notyet
87 u_char *ip6q_nxtp;
88 #endif
89 int ip6q_nfrag; /* # of fragments */
90 struct label *ip6q_label;
91 };
92
93 struct ip6asfrag {
94 struct ip6asfrag *ip6af_down;
95 struct ip6asfrag *ip6af_up;
96 struct mbuf *ip6af_m;
97 int ip6af_offset; /* offset in ip6af_m to next header */
98 int ip6af_frglen; /* fragmentable part length */
99 int ip6af_off; /* fragment offset */
100 u_int16_t ip6af_mff; /* more fragment bit in frag off */
101 };
102
103 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
104
105 /*
106 * IP6 reinjecting structure.
107 */
108 struct ip6_direct_ctx {
109 uint32_t ip6dc_nxt; /* next header to process */
110 uint32_t ip6dc_off; /* offset to next header */
111 };
112
113 /*
114 * Structure attached to inpcb.in6p_moptions and
115 * passed to ip6_output when IPv6 multicast options are in use.
116 * This structure is lazy-allocated.
117 */
118 struct ip6_moptions {
119 struct ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
120 u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
121 u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
122 u_short im6o_num_memberships; /* no. memberships this socket */
123 u_short im6o_max_memberships; /* max memberships this socket */
124 struct in6_multi **im6o_membership; /* group memberships */
125 struct in6_mfilter *im6o_mfilters; /* source filters */
126 struct epoch_context imo6_epoch_ctx;
127 };
128
129 /*
130 * Control options for outgoing packets
131 */
132
133 /* Routing header related info */
134 struct ip6po_rhinfo {
135 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
136 struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
137 };
138 #define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
139 #define ip6po_route ip6po_rhinfo.ip6po_rhi_route
140
141 /* Nexthop related info */
142 struct ip6po_nhinfo {
143 struct sockaddr *ip6po_nhi_nexthop;
144 struct route_in6 ip6po_nhi_route; /* Route to the nexthop */
145 };
146 #define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
147 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
148
149 struct ip6_pktopts {
150 struct mbuf *ip6po_m; /* Pointer to mbuf storing the data */
151 int ip6po_hlim; /* Hoplimit for outgoing packets */
152
153 /* Outgoing IF/address information */
154 struct in6_pktinfo *ip6po_pktinfo;
155
156 /* Next-hop address information */
157 struct ip6po_nhinfo ip6po_nhinfo;
158
159 struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
160
161 /* Destination options header (before a routing header) */
162 struct ip6_dest *ip6po_dest1;
163
164 /* Routing header related info. */
165 struct ip6po_rhinfo ip6po_rhinfo;
166
167 /* Destination options header (after a routing header) */
168 struct ip6_dest *ip6po_dest2;
169
170 int ip6po_tclass; /* traffic class */
171
172 int ip6po_minmtu; /* fragment vs PMTU discovery policy */
173 #define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
174 #define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
175 #define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
176
177 int ip6po_prefer_tempaddr; /* whether temporary addresses are
178 preferred as source address */
179 #define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
180 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
181 #define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
182
183 int ip6po_flags;
184 #if 0 /* parameters in this block is obsolete. do not reuse the values. */
185 #define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
186 #define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
187 #endif
188 #define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
189 #define IP6PO_USECOA 0x08 /* use care of address */
190 };
191
192 /*
193 * Control options for incoming packets
194 */
195
196 struct ip6stat {
197 uint64_t ip6s_total; /* total packets received */
198 uint64_t ip6s_tooshort; /* packet too short */
199 uint64_t ip6s_toosmall; /* not enough data */
200 uint64_t ip6s_fragments; /* fragments received */
201 uint64_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
202 uint64_t ip6s_fragtimeout; /* fragments timed out */
203 uint64_t ip6s_fragoverflow; /* fragments that exceeded limit */
204 uint64_t ip6s_forward; /* packets forwarded */
205 uint64_t ip6s_cantforward; /* packets rcvd for unreachable dest */
206 uint64_t ip6s_redirectsent; /* packets forwarded on same net */
207 uint64_t ip6s_delivered; /* datagrams delivered to upper level*/
208 uint64_t ip6s_localout; /* total ip packets generated here */
209 uint64_t ip6s_odropped; /* lost packets due to nobufs, etc. */
210 uint64_t ip6s_reassembled; /* total packets reassembled ok */
211 uint64_t ip6s_fragmented; /* datagrams successfully fragmented */
212 uint64_t ip6s_ofragments; /* output fragments created */
213 uint64_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
214 uint64_t ip6s_badoptions; /* error in option processing */
215 uint64_t ip6s_noroute; /* packets discarded due to no route */
216 uint64_t ip6s_badvers; /* ip6 version != 6 */
217 uint64_t ip6s_rawout; /* total raw ip packets generated */
218 uint64_t ip6s_badscope; /* scope error */
219 uint64_t ip6s_notmember; /* don't join this multicast group */
220 #define IP6S_HDRCNT 256 /* headers count */
221 uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
222 uint64_t ip6s_m1; /* one mbuf */
223 #define IP6S_M2MMAX 32
224 uint64_t ip6s_m2m[IP6S_M2MMAX]; /* two or more mbuf */
225 uint64_t ip6s_mext1; /* one ext mbuf */
226 uint64_t ip6s_mext2m; /* two or more ext mbuf */
227 uint64_t ip6s_exthdrtoolong; /* ext hdr are not contiguous */
228 uint64_t ip6s_nogif; /* no match gif found */
229 uint64_t ip6s_toomanyhdr; /* discarded due to too many headers */
230
231 /*
232 * statistics for improvement of the source address selection
233 * algorithm:
234 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
235 */
236 #define IP6S_RULESMAX 16
237 #define IP6S_SCOPECNT 16
238 /* number of times that address selection fails */
239 uint64_t ip6s_sources_none;
240 /* number of times that an address on the outgoing I/F is chosen */
241 uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
242 /* number of times that an address on a non-outgoing I/F is chosen */
243 uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
244 /*
245 * number of times that an address that has the same scope
246 * from the destination is chosen.
247 */
248 uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
249 /*
250 * number of times that an address that has a different scope
251 * from the destination is chosen.
252 */
253 uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
254 /* number of times that a deprecated address is chosen */
255 uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
256
257 /* number of times that each rule of source selection is applied. */
258 uint64_t ip6s_sources_rule[IP6S_RULESMAX];
259 };
260
261 #ifdef _KERNEL
262 #include <sys/counter.h>
263
264 VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
265 #define IP6STAT_ADD(name, val) \
266 VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
267 #define IP6STAT_SUB(name, val) IP6STAT_ADD(name, -(val))
268 #define IP6STAT_INC(name) IP6STAT_ADD(name, 1)
269 #define IP6STAT_DEC(name) IP6STAT_SUB(name, 1)
270 #endif
271
272 #ifdef _KERNEL
273 /* flags passed to ip6_output as last parameter */
274 #define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
275 #define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
276 #define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
277
278 #ifdef __NO_STRICT_ALIGNMENT
279 #define IP6_HDR_ALIGNED_P(ip) 1
280 #else
281 #define IP6_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
282 #endif
283
284 VNET_DECLARE(int, ip6_defhlim); /* default hop limit */
285 VNET_DECLARE(int, ip6_defmcasthlim); /* default multicast hop limit */
286 VNET_DECLARE(int, ip6_forwarding); /* act as router? */
287 VNET_DECLARE(int, ip6_use_deprecated); /* allow deprecated addr as source */
288 VNET_DECLARE(int, ip6_rr_prune); /* router renumbering prefix
289 * walk list every 5 sec. */
290 VNET_DECLARE(int, ip6_mcast_pmtu); /* enable pMTU discovery for multicast? */
291 VNET_DECLARE(int, ip6_v6only);
292 #define V_ip6_defhlim VNET(ip6_defhlim)
293 #define V_ip6_defmcasthlim VNET(ip6_defmcasthlim)
294 #define V_ip6_forwarding VNET(ip6_forwarding)
295 #define V_ip6_use_deprecated VNET(ip6_use_deprecated)
296 #define V_ip6_rr_prune VNET(ip6_rr_prune)
297 #define V_ip6_mcast_pmtu VNET(ip6_mcast_pmtu)
298 #define V_ip6_v6only VNET(ip6_v6only)
299
300 VNET_DECLARE(struct socket *, ip6_mrouter); /* multicast routing daemon */
301 VNET_DECLARE(int, ip6_sendredirects); /* send IP redirects when forwarding? */
302 VNET_DECLARE(int, ip6_maxfragpackets); /* Maximum packets in reassembly
303 * queue */
304 extern int ip6_maxfrags; /* Maximum fragments in reassembly
305 * queue */
306 VNET_DECLARE(int, ip6_maxfragbucketsize); /* Maximum reassembly queues per bucket */
307 VNET_DECLARE(int, ip6_maxfragsperpacket); /* Maximum fragments per packet */
308 VNET_DECLARE(int, ip6_accept_rtadv); /* Acts as a host not a router */
309 VNET_DECLARE(int, ip6_no_radr); /* No defroute from RA */
310 VNET_DECLARE(int, ip6_norbit_raif); /* Disable R-bit in NA on RA
311 * receiving IF. */
312 VNET_DECLARE(int, ip6_rfc6204w3); /* Accept defroute from RA even when
313 forwarding enabled */
314 VNET_DECLARE(int, ip6_log_interval);
315 VNET_DECLARE(time_t, ip6_log_time);
316 VNET_DECLARE(int, ip6_hdrnestlimit); /* upper limit of # of extension
317 * headers */
318 VNET_DECLARE(int, ip6_dad_count); /* DupAddrDetectionTransmits */
319 #define V_ip6_mrouter VNET(ip6_mrouter)
320 #define V_ip6_sendredirects VNET(ip6_sendredirects)
321 #define V_ip6_maxfragpackets VNET(ip6_maxfragpackets)
322 #define V_ip6_maxfragbucketsize VNET(ip6_maxfragbucketsize)
323 #define V_ip6_maxfragsperpacket VNET(ip6_maxfragsperpacket)
324 #define V_ip6_accept_rtadv VNET(ip6_accept_rtadv)
325 #define V_ip6_no_radr VNET(ip6_no_radr)
326 #define V_ip6_norbit_raif VNET(ip6_norbit_raif)
327 #define V_ip6_rfc6204w3 VNET(ip6_rfc6204w3)
328 #define V_ip6_log_interval VNET(ip6_log_interval)
329 #define V_ip6_log_time VNET(ip6_log_time)
330 #define V_ip6_hdrnestlimit VNET(ip6_hdrnestlimit)
331 #define V_ip6_dad_count VNET(ip6_dad_count)
332
333 VNET_DECLARE(int, ip6_auto_flowlabel);
334 VNET_DECLARE(int, ip6_auto_linklocal);
335 #define V_ip6_auto_flowlabel VNET(ip6_auto_flowlabel)
336 #define V_ip6_auto_linklocal VNET(ip6_auto_linklocal)
337
338 VNET_DECLARE(int, ip6_use_tempaddr); /* Whether to use temporary addresses */
339 VNET_DECLARE(int, ip6_prefer_tempaddr); /* Whether to prefer temporary
340 * addresses in the source address
341 * selection */
342 #define V_ip6_use_tempaddr VNET(ip6_use_tempaddr)
343 #define V_ip6_prefer_tempaddr VNET(ip6_prefer_tempaddr)
344
345 VNET_DECLARE(int, ip6_use_defzone); /* Whether to use the default scope
346 * zone when unspecified */
347 #define V_ip6_use_defzone VNET(ip6_use_defzone)
348
349 VNET_DECLARE (struct pfil_head, inet6_pfil_hook); /* packet filter hooks */
350 #define V_inet6_pfil_hook VNET(inet6_pfil_hook)
351 #ifdef IPSTEALTH
352 VNET_DECLARE(int, ip6stealth);
353 #define V_ip6stealth VNET(ip6stealth)
354 #endif
355
356 extern struct pr_usrreqs rip6_usrreqs;
357 struct sockopt;
358
359 struct inpcb;
360
361 int icmp6_ctloutput(struct socket *, struct sockopt *sopt);
362
363 struct in6_ifaddr;
364 void ip6_init(void);
365 int ip6proto_register(short);
366 int ip6proto_unregister(short);
367
368 void ip6_input(struct mbuf *);
369 void ip6_direct_input(struct mbuf *);
370 void ip6_freepcbopts(struct ip6_pktopts *);
371
372 int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
373 int ip6_get_prevhdr(const struct mbuf *, int);
374 int ip6_nexthdr(const struct mbuf *, int, int, int *);
375 int ip6_lasthdr(const struct mbuf *, int, int, int *);
376
377 extern int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
378 struct mbuf *);
379
380 int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
381 u_int32_t *);
382 struct mbuf **ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
383 struct mbuf **, int *);
384 void ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
385 void ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
386 int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
387
388 void ip6_forward(struct mbuf *, int);
389
390 void ip6_mloopback(struct ifnet *, struct mbuf *);
391 int ip6_output(struct mbuf *, struct ip6_pktopts *,
392 struct route_in6 *,
393 int,
394 struct ip6_moptions *, struct ifnet **,
395 struct inpcb *);
396 int ip6_ctloutput(struct socket *, struct sockopt *);
397 int ip6_raw_ctloutput(struct socket *, struct sockopt *);
398 void ip6_initpktopts(struct ip6_pktopts *);
399 int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
400 struct ip6_pktopts *, struct ucred *, int);
401 void ip6_clearpktopts(struct ip6_pktopts *, int);
402 struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
403 int ip6_optlen(struct inpcb *);
404 int ip6_deletefraghdr(struct mbuf *, int, int);
405 int ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
406 uint32_t);
407
408 int route6_input(struct mbuf **, int *, int);
409
410 void frag6_set_bucketsize(void);
411 void frag6_init(void);
412 int frag6_input(struct mbuf **, int *, int);
413 void frag6_slowtimo(void);
414 void frag6_drain(void);
415
416 void rip6_init(void);
417 int rip6_input(struct mbuf **, int *, int);
418 void rip6_ctlinput(int, struct sockaddr *, void *);
419 int rip6_ctloutput(struct socket *, struct sockopt *);
420 int rip6_output(struct mbuf *, struct socket *, ...);
421 int rip6_usrreq(struct socket *,
422 int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
423
424 int dest6_input(struct mbuf **, int *, int);
425 int none_input(struct mbuf **, int *, int);
426
427 int in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
428 struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
429 int in6_selectsrc_addr(uint32_t, const struct in6_addr *,
430 uint32_t, struct ifnet *, struct in6_addr *, int *);
431 int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
432 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
433 struct rtentry **);
434 int in6_selectroute_fib(struct sockaddr_in6 *, struct ip6_pktopts *,
435 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
436 struct rtentry **, u_int);
437 u_int32_t ip6_randomid(void);
438 u_int32_t ip6_randomflowlabel(void);
439 void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
440 #endif /* _KERNEL */
441
442 #endif /* !_NETINET6_IP6_VAR_H_ */
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