2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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8 * modification, are permitted provided that the following conditions
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14 * documentation and/or other materials provided with the distribution.
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16 * may be used to endorse or promote products derived from this software
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31 * $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
35 * Copyright (c) 1982, 1986, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
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.
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
62 * @(#)ip_var.h 8.1 (Berkeley) 6/10/93
65 #ifndef _NETINET6_IP6_VAR_H_
66 #define _NETINET6_IP6_VAR_H_
68 #include <sys/epoch.h>
71 struct ip6asfrag; /* frag6.c */
72 TAILQ_HEAD(ip6fraghead, ip6asfrag);
75 * IP6 reassembly queue structure. Each fragment
76 * being reassembled is attached to one of these structures.
79 struct ip6fraghead ip6q_frags;
84 struct in6_addr ip6q_src, ip6q_dst;
85 TAILQ_ENTRY(ip6q) ip6q_tq;
86 int ip6q_unfrglen; /* len of unfragmentable part */
87 int ip6q_nfrag; /* # of fragments */
88 struct label *ip6q_label;
93 * IP6 reinjecting structure.
95 struct ip6_direct_ctx {
96 uint32_t ip6dc_nxt; /* next header to process */
97 uint32_t ip6dc_off; /* offset to next header */
100 #if defined(_NETINET6_IN6_VAR_H_) && defined(_KERNEL)
102 * Structure attached to inpcb.in6p_moptions and
103 * passed to ip6_output when IPv6 multicast options are in use.
104 * This structure is lazy-allocated.
106 struct ip6_moptions {
107 struct ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
108 u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
109 u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
110 struct ip6_mfilter_head im6o_head; /* group membership list */
116 * Control options for outgoing packets
119 /* Routing header related info */
120 struct ip6po_rhinfo {
121 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
122 struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
124 #define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
125 #define ip6po_route ip6po_rhinfo.ip6po_rhi_route
127 /* Nexthop related info */
128 struct ip6po_nhinfo {
129 struct sockaddr *ip6po_nhi_nexthop;
130 struct route_in6 ip6po_nhi_route; /* Route to the nexthop */
132 #define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
133 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
136 struct mbuf *ip6po_m; /* Pointer to mbuf storing the data */
137 int ip6po_hlim; /* Hoplimit for outgoing packets */
139 /* Outgoing IF/address information */
140 struct in6_pktinfo *ip6po_pktinfo;
142 /* Next-hop address information */
143 struct ip6po_nhinfo ip6po_nhinfo;
145 struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
147 /* Destination options header (before a routing header) */
148 struct ip6_dest *ip6po_dest1;
150 /* Routing header related info. */
151 struct ip6po_rhinfo ip6po_rhinfo;
153 /* Destination options header (after a routing header) */
154 struct ip6_dest *ip6po_dest2;
156 int ip6po_tclass; /* traffic class */
158 int ip6po_minmtu; /* fragment vs PMTU discovery policy */
159 #define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
160 #define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
161 #define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
163 int ip6po_prefer_tempaddr; /* whether temporary addresses are
164 preferred as source address */
165 #define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
166 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
167 #define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
170 #if 0 /* parameters in this block is obsolete. do not reuse the values. */
171 #define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
172 #define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
174 #define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
175 #define IP6PO_USECOA 0x08 /* use care of address */
179 * Control options for incoming packets
183 uint64_t ip6s_total; /* total packets received */
184 uint64_t ip6s_tooshort; /* packet too short */
185 uint64_t ip6s_toosmall; /* not enough data */
186 uint64_t ip6s_fragments; /* fragments received */
187 uint64_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
188 uint64_t ip6s_fragtimeout; /* fragments timed out */
189 uint64_t ip6s_fragoverflow; /* fragments that exceeded limit */
190 uint64_t ip6s_forward; /* packets forwarded */
191 uint64_t ip6s_cantforward; /* packets rcvd for unreachable dest */
192 uint64_t ip6s_redirectsent; /* packets forwarded on same net */
193 uint64_t ip6s_delivered; /* datagrams delivered to upper level*/
194 uint64_t ip6s_localout; /* total ip packets generated here */
195 uint64_t ip6s_odropped; /* lost packets due to nobufs, etc. */
196 uint64_t ip6s_reassembled; /* total packets reassembled ok */
197 uint64_t ip6s_atomicfrags; /* atomic fragments */
198 uint64_t ip6s_fragmented; /* datagrams successfully fragmented */
199 uint64_t ip6s_ofragments; /* output fragments created */
200 uint64_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
201 uint64_t ip6s_badoptions; /* error in option processing */
202 uint64_t ip6s_noroute; /* packets discarded due to no route */
203 uint64_t ip6s_badvers; /* ip6 version != 6 */
204 uint64_t ip6s_rawout; /* total raw ip packets generated */
205 uint64_t ip6s_badscope; /* scope error */
206 uint64_t ip6s_notmember; /* don't join this multicast group */
207 #define IP6S_HDRCNT 256 /* headers count */
208 uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
209 uint64_t ip6s_m1; /* one mbuf */
210 #define IP6S_M2MMAX 32
211 uint64_t ip6s_m2m[IP6S_M2MMAX]; /* two or more mbuf */
212 uint64_t ip6s_mext1; /* one ext mbuf */
213 uint64_t ip6s_mext2m; /* two or more ext mbuf */
214 uint64_t ip6s_exthdrtoolong; /* ext hdr are not contiguous */
215 uint64_t ip6s_nogif; /* no match gif found */
216 uint64_t ip6s_toomanyhdr; /* discarded due to too many headers */
219 * statistics for improvement of the source address selection
221 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
223 #define IP6S_RULESMAX 16
224 #define IP6S_SCOPECNT 16
225 /* number of times that address selection fails */
226 uint64_t ip6s_sources_none;
227 /* number of times that an address on the outgoing I/F is chosen */
228 uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
229 /* number of times that an address on a non-outgoing I/F is chosen */
230 uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
232 * number of times that an address that has the same scope
233 * from the destination is chosen.
235 uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
237 * number of times that an address that has a different scope
238 * from the destination is chosen.
240 uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
241 /* number of times that a deprecated address is chosen */
242 uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
244 /* number of times that each rule of source selection is applied. */
245 uint64_t ip6s_sources_rule[IP6S_RULESMAX];
249 #include <sys/counter.h>
251 VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
252 #define IP6STAT_ADD(name, val) \
253 VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
254 #define IP6STAT_SUB(name, val) IP6STAT_ADD(name, -(val))
255 #define IP6STAT_INC(name) IP6STAT_ADD(name, 1)
256 #define IP6STAT_DEC(name) IP6STAT_SUB(name, 1)
260 /* flags passed to ip6_output as last parameter */
261 #define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
262 #define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
263 #define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
265 #ifdef __NO_STRICT_ALIGNMENT
266 #define IP6_HDR_ALIGNED_P(ip) 1
268 #define IP6_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
271 VNET_DECLARE(int, ip6_defhlim); /* default hop limit */
272 VNET_DECLARE(int, ip6_defmcasthlim); /* default multicast hop limit */
273 VNET_DECLARE(int, ip6_forwarding); /* act as router? */
274 VNET_DECLARE(int, ip6_use_deprecated); /* allow deprecated addr as source */
275 VNET_DECLARE(int, ip6_rr_prune); /* router renumbering prefix
276 * walk list every 5 sec. */
277 VNET_DECLARE(int, ip6_mcast_pmtu); /* enable pMTU discovery for multicast? */
278 VNET_DECLARE(int, ip6_v6only);
279 #define V_ip6_defhlim VNET(ip6_defhlim)
280 #define V_ip6_defmcasthlim VNET(ip6_defmcasthlim)
281 #define V_ip6_forwarding VNET(ip6_forwarding)
282 #define V_ip6_use_deprecated VNET(ip6_use_deprecated)
283 #define V_ip6_rr_prune VNET(ip6_rr_prune)
284 #define V_ip6_mcast_pmtu VNET(ip6_mcast_pmtu)
285 #define V_ip6_v6only VNET(ip6_v6only)
287 VNET_DECLARE(struct socket *, ip6_mrouter); /* multicast routing daemon */
288 VNET_DECLARE(int, ip6_sendredirects); /* send IP redirects when forwarding? */
289 VNET_DECLARE(int, ip6_accept_rtadv); /* Acts as a host not a router */
290 VNET_DECLARE(int, ip6_no_radr); /* No defroute from RA */
291 VNET_DECLARE(int, ip6_norbit_raif); /* Disable R-bit in NA on RA
293 VNET_DECLARE(int, ip6_rfc6204w3); /* Accept defroute from RA even when
294 forwarding enabled */
295 VNET_DECLARE(int, ip6_hdrnestlimit); /* upper limit of # of extension
297 VNET_DECLARE(int, ip6_dad_count); /* DupAddrDetectionTransmits */
298 #define V_ip6_mrouter VNET(ip6_mrouter)
299 #define V_ip6_sendredirects VNET(ip6_sendredirects)
300 #define V_ip6_accept_rtadv VNET(ip6_accept_rtadv)
301 #define V_ip6_no_radr VNET(ip6_no_radr)
302 #define V_ip6_norbit_raif VNET(ip6_norbit_raif)
303 #define V_ip6_rfc6204w3 VNET(ip6_rfc6204w3)
304 #define V_ip6_hdrnestlimit VNET(ip6_hdrnestlimit)
305 #define V_ip6_dad_count VNET(ip6_dad_count)
307 VNET_DECLARE(int, ip6_auto_flowlabel);
308 VNET_DECLARE(int, ip6_auto_linklocal);
309 #define V_ip6_auto_flowlabel VNET(ip6_auto_flowlabel)
310 #define V_ip6_auto_linklocal VNET(ip6_auto_linklocal)
312 VNET_DECLARE(int, ip6_use_tempaddr); /* Whether to use temporary addresses */
313 VNET_DECLARE(int, ip6_prefer_tempaddr); /* Whether to prefer temporary
314 * addresses in the source address
316 #define V_ip6_use_tempaddr VNET(ip6_use_tempaddr)
317 #define V_ip6_prefer_tempaddr VNET(ip6_prefer_tempaddr)
319 VNET_DECLARE(int, ip6_use_defzone); /* Whether to use the default scope
320 * zone when unspecified */
321 #define V_ip6_use_defzone VNET(ip6_use_defzone)
323 VNET_DECLARE(struct pfil_head *, inet6_pfil_head);
324 #define V_inet6_pfil_head VNET(inet6_pfil_head)
325 #define PFIL_INET6_NAME "inet6"
327 VNET_DECLARE(struct pfil_head *, inet6_local_pfil_head);
328 #define V_inet6_local_pfil_head VNET(inet6_local_pfil_head)
329 #define PFIL_INET6_LOCAL_NAME "inet6-local"
332 VNET_DECLARE(int, ip6stealth);
333 #define V_ip6stealth VNET(ip6stealth)
337 VNET_DECLARE(int, nd6_ignore_ipv6_only_ra);
338 #define V_nd6_ignore_ipv6_only_ra VNET(nd6_ignore_ipv6_only_ra)
341 VNET_DECLARE(bool, ip6_log_cannot_forward);
342 #define V_ip6_log_cannot_forward VNET(ip6_log_cannot_forward)
344 extern struct pr_usrreqs rip6_usrreqs;
350 int icmp6_ctloutput(struct socket *, struct sockopt *sopt);
352 void ip6_input(struct mbuf *);
353 void ip6_direct_input(struct mbuf *);
354 void ip6_freepcbopts(struct ip6_pktopts *);
356 int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
357 int ip6_get_prevhdr(const struct mbuf *, int);
358 int ip6_nexthdr(const struct mbuf *, int, int, int *);
359 int ip6_lasthdr(const struct mbuf *, int, int, int *);
361 extern int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
364 int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
366 struct mbuf **ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
367 struct mbuf **, int *);
368 void ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
369 void ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
370 int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
372 void ip6_forward(struct mbuf *, int);
374 void ip6_mloopback(struct ifnet *, struct mbuf *);
375 int ip6_output(struct mbuf *, struct ip6_pktopts *,
378 struct ip6_moptions *, struct ifnet **,
380 int ip6_ctloutput(struct socket *, struct sockopt *);
381 int ip6_raw_ctloutput(struct socket *, struct sockopt *);
382 void ip6_initpktopts(struct ip6_pktopts *);
383 int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
384 struct ip6_pktopts *, struct ucred *, int);
385 void ip6_clearpktopts(struct ip6_pktopts *, int);
386 struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
387 int ip6_optlen(struct inpcb *);
388 int ip6_deletefraghdr(struct mbuf *, int, int);
389 int ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
392 int route6_input(struct mbuf **, int *, int);
394 void frag6_init(void);
395 void frag6_destroy(void);
396 int frag6_input(struct mbuf **, int *, int);
397 void frag6_drain(void);
399 void rip6_init(void);
400 int rip6_ctloutput(struct socket *, struct sockopt *);
401 int rip6_usrreq(struct socket *,
402 int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
404 int dest6_input(struct mbuf **, int *, int);
405 int none_input(struct mbuf **, int *, int);
407 int in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
408 struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
409 int in6_selectsrc_addr(uint32_t, const struct in6_addr *,
410 uint32_t, struct ifnet *, struct in6_addr *, int *);
411 int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
412 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
413 struct nhop_object **, u_int, uint32_t);
414 u_int32_t ip6_randomid(void);
415 u_int32_t ip6_randomflowlabel(void);
416 void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
418 int ip6_log_ratelimit(void);
421 * Argument type for the last arg of ip6proto_ctlinput_t().
423 * IPv6 ICMP IPv6 [exthdrs] finalhdr payload
425 * | | ip6c_ip6 ip6c_off
429 * ip6c_finaldst's sin6_addr usually points to ip6c_ip6->ip6_dst. If the
430 * original * (internal) packet carries a routing header, it may point the
431 * final * destination address in the routing header.
433 * ip6c_src: ip6c_ip6->ip6_src + scope info + flowlabel in ip6c_ip6
434 * (beware of flowlabel, if you try to compare it against others)
435 * ip6c_dst: ip6c_finaldst + scope info
438 struct mbuf *ip6c_m; /* start of mbuf chain */
439 struct icmp6_hdr *ip6c_icmp6; /* icmp6 header of target packet */
440 struct ip6_hdr *ip6c_ip6; /* ip6 header of target packet */
441 int ip6c_off; /* offset of the target proto header */
442 struct sockaddr_in6 *ip6c_src; /* srcaddr w/ additional info */
443 struct sockaddr_in6 *ip6c_dst; /* (final) dstaddr w/ additional info */
444 struct sockaddr_in6 *ip6c_finaldst; /* final destination address */
445 void *ip6c_cmdarg; /* control command dependent data */
446 u_int8_t ip6c_nxt; /* final next header field */
449 typedef int ip6proto_input_t(struct mbuf **, int *, int);
450 typedef void ip6proto_ctlinput_t(struct ip6ctlparam *);
451 int ip6proto_register(uint8_t, ip6proto_input_t, ip6proto_ctlinput_t);
452 int ip6proto_unregister(uint8_t);
453 #define IP6PROTO_REGISTER(prot, input, ctl) do { \
454 int error __diagused; \
455 error = ip6proto_register(prot, input, ctl); \
459 ip6proto_input_t rip6_input;
460 ip6proto_ctlinput_t rip6_ctlinput;
464 #endif /* !_NETINET6_IP6_VAR_H_ */