xref: /freebsd/sys/netinet6/ip6_var.h (revision 1de7b4b805ddbf2429da511c053686ac4591ed89)
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 /*
70  * IP6 reassembly queue structure.  Each fragment
71  * being reassembled is attached to one of these structures.
72  */
73 struct	ip6q {
74 	struct ip6asfrag *ip6q_down;
75 	struct ip6asfrag *ip6q_up;
76 	u_int32_t	ip6q_ident;
77 	u_int8_t	ip6q_nxt;
78 	u_int8_t	ip6q_ecn;
79 	u_int8_t	ip6q_ttl;
80 	struct in6_addr ip6q_src, ip6q_dst;
81 	struct ip6q	*ip6q_next;
82 	struct ip6q	*ip6q_prev;
83 	int		ip6q_unfrglen;	/* len of unfragmentable part */
84 #ifdef notyet
85 	u_char		*ip6q_nxtp;
86 #endif
87 	int		ip6q_nfrag;	/* # of fragments */
88 	struct label	*ip6q_label;
89 };
90 
91 struct	ip6asfrag {
92 	struct ip6asfrag *ip6af_down;
93 	struct ip6asfrag *ip6af_up;
94 	struct mbuf	*ip6af_m;
95 	int		ip6af_offset;	/* offset in ip6af_m to next header */
96 	int		ip6af_frglen;	/* fragmentable part length */
97 	int		ip6af_off;	/* fragment offset */
98 	u_int16_t	ip6af_mff;	/* more fragment bit in frag off */
99 };
100 
101 #define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
102 
103 /*
104  * IP6 reinjecting structure.
105  */
106 struct ip6_direct_ctx {
107 	uint32_t	ip6dc_nxt;	/* next header to process */
108 	uint32_t	ip6dc_off;	/* offset to next header */
109 };
110 
111 /*
112  * Structure attached to inpcb.in6p_moptions and
113  * passed to ip6_output when IPv6 multicast options are in use.
114  * This structure is lazy-allocated.
115  */
116 struct ip6_moptions {
117 	struct	ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
118 	u_char	im6o_multicast_hlim;	/* hoplimit for outgoing multicasts */
119 	u_char	im6o_multicast_loop;	/* 1 >= hear sends if a member */
120 	u_short	im6o_num_memberships;	/* no. memberships this socket */
121 	u_short	im6o_max_memberships;	/* max memberships this socket */
122 	struct	in6_multi **im6o_membership;	/* group memberships */
123 	struct	in6_mfilter *im6o_mfilters;	/* source filters */
124 };
125 
126 /*
127  * Control options for outgoing packets
128  */
129 
130 /* Routing header related info */
131 struct	ip6po_rhinfo {
132 	struct	ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
133 	struct	route_in6 ip6po_rhi_route; /* Route to the 1st hop */
134 };
135 #define ip6po_rthdr	ip6po_rhinfo.ip6po_rhi_rthdr
136 #define ip6po_route	ip6po_rhinfo.ip6po_rhi_route
137 
138 /* Nexthop related info */
139 struct	ip6po_nhinfo {
140 	struct	sockaddr *ip6po_nhi_nexthop;
141 	struct	route_in6 ip6po_nhi_route; /* Route to the nexthop */
142 };
143 #define ip6po_nexthop	ip6po_nhinfo.ip6po_nhi_nexthop
144 #define ip6po_nextroute	ip6po_nhinfo.ip6po_nhi_route
145 
146 struct	ip6_pktopts {
147 	struct	mbuf *ip6po_m;	/* Pointer to mbuf storing the data */
148 	int	ip6po_hlim;	/* Hoplimit for outgoing packets */
149 
150 	/* Outgoing IF/address information */
151 	struct	in6_pktinfo *ip6po_pktinfo;
152 
153 	/* Next-hop address information */
154 	struct	ip6po_nhinfo ip6po_nhinfo;
155 
156 	struct	ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
157 
158 	/* Destination options header (before a routing header) */
159 	struct	ip6_dest *ip6po_dest1;
160 
161 	/* Routing header related info. */
162 	struct	ip6po_rhinfo ip6po_rhinfo;
163 
164 	/* Destination options header (after a routing header) */
165 	struct	ip6_dest *ip6po_dest2;
166 
167 	int	ip6po_tclass;	/* traffic class */
168 
169 	int	ip6po_minmtu;  /* fragment vs PMTU discovery policy */
170 #define IP6PO_MINMTU_MCASTONLY	-1 /* default; send at min MTU for multicast*/
171 #define IP6PO_MINMTU_DISABLE	 0 /* always perform pmtu disc */
172 #define IP6PO_MINMTU_ALL	 1 /* always send at min MTU */
173 
174 	int	ip6po_prefer_tempaddr;  /* whether temporary addresses are
175 					   preferred as source address */
176 #define IP6PO_TEMPADDR_SYSTEM	-1 /* follow the system default */
177 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
178 #define IP6PO_TEMPADDR_PREFER	 1 /* prefer temporary address */
179 
180 	int ip6po_flags;
181 #if 0	/* parameters in this block is obsolete. do not reuse the values. */
182 #define IP6PO_REACHCONF	0x01	/* upper-layer reachability confirmation. */
183 #define IP6PO_MINMTU	0x02	/* use minimum MTU (IPV6_USE_MIN_MTU) */
184 #endif
185 #define IP6PO_DONTFRAG	0x04	/* disable fragmentation (IPV6_DONTFRAG) */
186 #define IP6PO_USECOA	0x08	/* use care of address */
187 };
188 
189 /*
190  * Control options for incoming packets
191  */
192 
193 struct	ip6stat {
194 	uint64_t ip6s_total;		/* total packets received */
195 	uint64_t ip6s_tooshort;		/* packet too short */
196 	uint64_t ip6s_toosmall;		/* not enough data */
197 	uint64_t ip6s_fragments;	/* fragments received */
198 	uint64_t ip6s_fragdropped;	/* frags dropped(dups, out of space) */
199 	uint64_t ip6s_fragtimeout;	/* fragments timed out */
200 	uint64_t ip6s_fragoverflow;	/* fragments that exceeded limit */
201 	uint64_t ip6s_forward;		/* packets forwarded */
202 	uint64_t ip6s_cantforward;	/* packets rcvd for unreachable dest */
203 	uint64_t ip6s_redirectsent;	/* packets forwarded on same net */
204 	uint64_t ip6s_delivered;	/* datagrams delivered to upper level*/
205 	uint64_t ip6s_localout;		/* total ip packets generated here */
206 	uint64_t ip6s_odropped;		/* lost packets due to nobufs, etc. */
207 	uint64_t ip6s_reassembled;	/* total packets reassembled ok */
208 	uint64_t ip6s_fragmented;	/* datagrams successfully fragmented */
209 	uint64_t ip6s_ofragments;	/* output fragments created */
210 	uint64_t ip6s_cantfrag;		/* don't fragment flag was set, etc. */
211 	uint64_t ip6s_badoptions;	/* error in option processing */
212 	uint64_t ip6s_noroute;		/* packets discarded due to no route */
213 	uint64_t ip6s_badvers;		/* ip6 version != 6 */
214 	uint64_t ip6s_rawout;		/* total raw ip packets generated */
215 	uint64_t ip6s_badscope;		/* scope error */
216 	uint64_t ip6s_notmember;	/* don't join this multicast group */
217 #define	IP6S_HDRCNT		256	/* headers count */
218 	uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
219 	uint64_t ip6s_m1;		/* one mbuf */
220 #define	IP6S_M2MMAX		32
221 	uint64_t ip6s_m2m[IP6S_M2MMAX];	/* two or more mbuf */
222 	uint64_t ip6s_mext1;		/* one ext mbuf */
223 	uint64_t ip6s_mext2m;		/* two or more ext mbuf */
224 	uint64_t ip6s_exthdrtoolong;	/* ext hdr are not contiguous */
225 	uint64_t ip6s_nogif;		/* no match gif found */
226 	uint64_t ip6s_toomanyhdr;	/* discarded due to too many headers */
227 
228 	/*
229 	 * statistics for improvement of the source address selection
230 	 * algorithm:
231 	 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
232 	 */
233 #define	IP6S_RULESMAX		16
234 #define	IP6S_SCOPECNT		16
235 	/* number of times that address selection fails */
236 	uint64_t ip6s_sources_none;
237 	/* number of times that an address on the outgoing I/F is chosen */
238 	uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
239 	/* number of times that an address on a non-outgoing I/F is chosen */
240 	uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
241 	/*
242 	 * number of times that an address that has the same scope
243 	 * from the destination is chosen.
244 	 */
245 	uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
246 	/*
247 	 * number of times that an address that has a different scope
248 	 * from the destination is chosen.
249 	 */
250 	uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
251 	/* number of times that a deprecated address is chosen */
252 	uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
253 
254 	/* number of times that each rule of source selection is applied. */
255 	uint64_t ip6s_sources_rule[IP6S_RULESMAX];
256 };
257 
258 #ifdef _KERNEL
259 #include <sys/counter.h>
260 
261 VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
262 #define	IP6STAT_ADD(name, val)	\
263     VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
264 #define	IP6STAT_SUB(name, val)	IP6STAT_ADD(name, -(val))
265 #define	IP6STAT_INC(name)	IP6STAT_ADD(name, 1)
266 #define	IP6STAT_DEC(name)	IP6STAT_SUB(name, 1)
267 #endif
268 
269 #ifdef _KERNEL
270 /* flags passed to ip6_output as last parameter */
271 #define	IPV6_UNSPECSRC		0x01	/* allow :: as the source address */
272 #define	IPV6_FORWARDING		0x02	/* most of IPv6 header exists */
273 #define	IPV6_MINMTU		0x04	/* use minimum MTU (IPV6_USE_MIN_MTU) */
274 
275 #ifdef __NO_STRICT_ALIGNMENT
276 #define IP6_HDR_ALIGNED_P(ip)	1
277 #else
278 #define IP6_HDR_ALIGNED_P(ip)	((((intptr_t) (ip)) & 3) == 0)
279 #endif
280 
281 VNET_DECLARE(int, ip6_defhlim);		/* default hop limit */
282 VNET_DECLARE(int, ip6_defmcasthlim);	/* default multicast hop limit */
283 VNET_DECLARE(int, ip6_forwarding);	/* act as router? */
284 VNET_DECLARE(int, ip6_use_deprecated);	/* allow deprecated addr as source */
285 VNET_DECLARE(int, ip6_rr_prune);	/* router renumbering prefix
286 					 * walk list every 5 sec.    */
287 VNET_DECLARE(int, ip6_mcast_pmtu);	/* enable pMTU discovery for multicast? */
288 VNET_DECLARE(int, ip6_v6only);
289 #define	V_ip6_defhlim			VNET(ip6_defhlim)
290 #define	V_ip6_defmcasthlim		VNET(ip6_defmcasthlim)
291 #define	V_ip6_forwarding		VNET(ip6_forwarding)
292 #define	V_ip6_use_deprecated		VNET(ip6_use_deprecated)
293 #define	V_ip6_rr_prune			VNET(ip6_rr_prune)
294 #define	V_ip6_mcast_pmtu		VNET(ip6_mcast_pmtu)
295 #define	V_ip6_v6only			VNET(ip6_v6only)
296 
297 VNET_DECLARE(struct socket *, ip6_mrouter);	/* multicast routing daemon */
298 VNET_DECLARE(int, ip6_sendredirects);	/* send IP redirects when forwarding? */
299 VNET_DECLARE(int, ip6_maxfragpackets);	/* Maximum packets in reassembly
300 					 * queue */
301 VNET_DECLARE(int, ip6_maxfrags);	/* Maximum fragments in reassembly
302 					 * queue */
303 VNET_DECLARE(int, ip6_accept_rtadv);	/* Acts as a host not a router */
304 VNET_DECLARE(int, ip6_no_radr);		/* No defroute from RA */
305 VNET_DECLARE(int, ip6_norbit_raif);	/* Disable R-bit in NA on RA
306 					 * receiving IF. */
307 VNET_DECLARE(int, ip6_rfc6204w3);	/* Accept defroute from RA even when
308 					   forwarding enabled */
309 VNET_DECLARE(int, ip6_log_interval);
310 VNET_DECLARE(time_t, ip6_log_time);
311 VNET_DECLARE(int, ip6_hdrnestlimit);	/* upper limit of # of extension
312 					 * headers */
313 VNET_DECLARE(int, ip6_dad_count);	/* DupAddrDetectionTransmits */
314 #define	V_ip6_mrouter			VNET(ip6_mrouter)
315 #define	V_ip6_sendredirects		VNET(ip6_sendredirects)
316 #define	V_ip6_maxfragpackets		VNET(ip6_maxfragpackets)
317 #define	V_ip6_maxfrags			VNET(ip6_maxfrags)
318 #define	V_ip6_accept_rtadv		VNET(ip6_accept_rtadv)
319 #define	V_ip6_no_radr			VNET(ip6_no_radr)
320 #define	V_ip6_norbit_raif		VNET(ip6_norbit_raif)
321 #define	V_ip6_rfc6204w3			VNET(ip6_rfc6204w3)
322 #define	V_ip6_log_interval		VNET(ip6_log_interval)
323 #define	V_ip6_log_time			VNET(ip6_log_time)
324 #define	V_ip6_hdrnestlimit		VNET(ip6_hdrnestlimit)
325 #define	V_ip6_dad_count			VNET(ip6_dad_count)
326 
327 VNET_DECLARE(int, ip6_auto_flowlabel);
328 VNET_DECLARE(int, ip6_auto_linklocal);
329 #define	V_ip6_auto_flowlabel		VNET(ip6_auto_flowlabel)
330 #define	V_ip6_auto_linklocal		VNET(ip6_auto_linklocal)
331 
332 VNET_DECLARE(int, ip6_use_tempaddr);	/* Whether to use temporary addresses */
333 VNET_DECLARE(int, ip6_prefer_tempaddr);	/* Whether to prefer temporary
334 					 * addresses in the source address
335 					 * selection */
336 #define	V_ip6_use_tempaddr		VNET(ip6_use_tempaddr)
337 #define	V_ip6_prefer_tempaddr		VNET(ip6_prefer_tempaddr)
338 
339 VNET_DECLARE(int, ip6_use_defzone);	/* Whether to use the default scope
340 					 * zone when unspecified */
341 #define	V_ip6_use_defzone		VNET(ip6_use_defzone)
342 
343 VNET_DECLARE (struct pfil_head, inet6_pfil_hook);	/* packet filter hooks */
344 #define	V_inet6_pfil_hook	VNET(inet6_pfil_hook)
345 #ifdef IPSTEALTH
346 VNET_DECLARE(int, ip6stealth);
347 #define	V_ip6stealth			VNET(ip6stealth)
348 #endif
349 
350 extern struct	pr_usrreqs rip6_usrreqs;
351 struct sockopt;
352 
353 struct inpcb;
354 
355 int	icmp6_ctloutput(struct socket *, struct sockopt *sopt);
356 
357 struct in6_ifaddr;
358 void	ip6_init(void);
359 int	ip6proto_register(short);
360 int	ip6proto_unregister(short);
361 
362 void	ip6_input(struct mbuf *);
363 void	ip6_direct_input(struct mbuf *);
364 void	ip6_freepcbopts(struct ip6_pktopts *);
365 
366 int	ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
367 char *	ip6_get_prevhdr(const struct mbuf *, int);
368 int	ip6_nexthdr(const struct mbuf *, int, int, int *);
369 int	ip6_lasthdr(const struct mbuf *, int, int, int *);
370 
371 extern int	(*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
372     struct mbuf *);
373 
374 int	ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
375 				 u_int32_t *);
376 struct mbuf	**ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
377 	    struct mbuf **, int *);
378 void	ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
379 void	ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
380 int	ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
381 
382 void	ip6_forward(struct mbuf *, int);
383 
384 void	ip6_mloopback(struct ifnet *, struct mbuf *);
385 int	ip6_output(struct mbuf *, struct ip6_pktopts *,
386 			struct route_in6 *,
387 			int,
388 			struct ip6_moptions *, struct ifnet **,
389 			struct inpcb *);
390 int	ip6_ctloutput(struct socket *, struct sockopt *);
391 int	ip6_raw_ctloutput(struct socket *, struct sockopt *);
392 void	ip6_initpktopts(struct ip6_pktopts *);
393 int	ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
394 	struct ip6_pktopts *, struct ucred *, int);
395 void	ip6_clearpktopts(struct ip6_pktopts *, int);
396 struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
397 int	ip6_optlen(struct inpcb *);
398 int	ip6_deletefraghdr(struct mbuf *, int, int);
399 int	ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
400 			uint32_t);
401 
402 int	route6_input(struct mbuf **, int *, int);
403 
404 void	frag6_init(void);
405 int	frag6_input(struct mbuf **, int *, int);
406 void	frag6_slowtimo(void);
407 void	frag6_drain(void);
408 
409 void	rip6_init(void);
410 int	rip6_input(struct mbuf **, int *, int);
411 void	rip6_ctlinput(int, struct sockaddr *, void *);
412 int	rip6_ctloutput(struct socket *, struct sockopt *);
413 int	rip6_output(struct mbuf *, struct socket *, ...);
414 int	rip6_usrreq(struct socket *,
415 	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
416 
417 int	dest6_input(struct mbuf **, int *, int);
418 int	none_input(struct mbuf **, int *, int);
419 
420 int	in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
421     struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
422 int	in6_selectsrc_addr(uint32_t, const struct in6_addr *,
423     uint32_t, struct ifnet *, struct in6_addr *, int *);
424 int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
425 	struct ip6_moptions *, struct route_in6 *, struct ifnet **,
426 	struct rtentry **);
427 int	in6_selectroute_fib(struct sockaddr_in6 *, struct ip6_pktopts *,
428 	    struct ip6_moptions *, struct route_in6 *, struct ifnet **,
429 	    struct rtentry **, u_int);
430 u_int32_t ip6_randomid(void);
431 u_int32_t ip6_randomflowlabel(void);
432 void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
433 #endif /* _KERNEL */
434 
435 #endif /* !_NETINET6_IP6_VAR_H_ */
436