ip6_var.h revision 193731
1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	$KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1993
34 *	The Regents of the University of California.  All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 *	@(#)ip_var.h	8.1 (Berkeley) 6/10/93
61 * $FreeBSD: head/sys/netinet6/ip6_var.h 193731 2009-06-08 17:15:40Z zec $
62 */
63
64#ifndef _NETINET6_IP6_VAR_H_
65#define _NETINET6_IP6_VAR_H_
66
67/*
68 * IP6 reassembly queue structure.  Each fragment
69 * being reassembled is attached to one of these structures.
70 */
71struct	ip6q {
72	struct ip6asfrag *ip6q_down;
73	struct ip6asfrag *ip6q_up;
74	u_int32_t	ip6q_ident;
75	u_int8_t	ip6q_nxt;
76	u_int8_t	ip6q_ecn;
77	u_int8_t	ip6q_ttl;
78	struct in6_addr ip6q_src, ip6q_dst;
79	struct ip6q	*ip6q_next;
80	struct ip6q	*ip6q_prev;
81	int		ip6q_unfrglen;	/* len of unfragmentable part */
82#ifdef notyet
83	u_char		*ip6q_nxtp;
84#endif
85	int		ip6q_nfrag;	/* # of fragments */
86	struct label	*ip6q_label;
87};
88
89struct	ip6asfrag {
90	struct ip6asfrag *ip6af_down;
91	struct ip6asfrag *ip6af_up;
92	struct mbuf	*ip6af_m;
93	int		ip6af_offset;	/* offset in ip6af_m to next header */
94	int		ip6af_frglen;	/* fragmentable part length */
95	int		ip6af_off;	/* fragment offset */
96	u_int16_t	ip6af_mff;	/* more fragment bit in frag off */
97};
98
99#define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
100
101/*
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.
105 */
106struct 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	u_short	im6o_num_memberships;	/* no. memberships this socket */
111	u_short	im6o_max_memberships;	/* max memberships this socket */
112	struct	in6_multi **im6o_membership;	/* group memberships */
113	struct	in6_mfilter *im6o_mfilters;	/* source filters */
114};
115
116/*
117 * Control options for outgoing packets
118 */
119
120/* Routing header related info */
121struct	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 */
129struct	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
136struct	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
183struct	ip6stat {
184	u_quad_t ip6s_total;		/* total packets received */
185	u_quad_t ip6s_tooshort;		/* packet too short */
186	u_quad_t ip6s_toosmall;		/* not enough data */
187	u_quad_t ip6s_fragments;	/* fragments received */
188	u_quad_t ip6s_fragdropped;	/* frags dropped(dups, out of space) */
189	u_quad_t ip6s_fragtimeout;	/* fragments timed out */
190	u_quad_t ip6s_fragoverflow;	/* fragments that exceeded limit */
191	u_quad_t ip6s_forward;		/* packets forwarded */
192	u_quad_t ip6s_cantforward;	/* packets rcvd for unreachable dest */
193	u_quad_t ip6s_redirectsent;	/* packets forwarded on same net */
194	u_quad_t ip6s_delivered;	/* datagrams delivered to upper level*/
195	u_quad_t ip6s_localout;		/* total ip packets generated here */
196	u_quad_t ip6s_odropped;		/* lost packets due to nobufs, etc. */
197	u_quad_t ip6s_reassembled;	/* total packets reassembled ok */
198	u_quad_t ip6s_fragmented;	/* datagrams successfully fragmented */
199	u_quad_t ip6s_ofragments;	/* output fragments created */
200	u_quad_t ip6s_cantfrag;		/* don't fragment flag was set, etc. */
201	u_quad_t ip6s_badoptions;	/* error in option processing */
202	u_quad_t ip6s_noroute;		/* packets discarded due to no route */
203	u_quad_t ip6s_badvers;		/* ip6 version != 6 */
204	u_quad_t ip6s_rawout;		/* total raw ip packets generated */
205	u_quad_t ip6s_badscope;		/* scope error */
206	u_quad_t ip6s_notmember;	/* don't join this multicast group */
207	u_quad_t ip6s_nxthist[256];	/* next header history */
208	u_quad_t ip6s_m1;		/* one mbuf */
209	u_quad_t ip6s_m2m[32];		/* two or more mbuf */
210	u_quad_t ip6s_mext1;		/* one ext mbuf */
211	u_quad_t ip6s_mext2m;		/* two or more ext mbuf */
212	u_quad_t ip6s_exthdrtoolong;	/* ext hdr are not continuous */
213	u_quad_t ip6s_nogif;		/* no match gif found */
214	u_quad_t ip6s_toomanyhdr;	/* discarded due to too many headers */
215
216	/*
217	 * statistics for improvement of the source address selection
218	 * algorithm:
219	 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
220	 */
221	/* number of times that address selection fails */
222	u_quad_t ip6s_sources_none;
223	/* number of times that an address on the outgoing I/F is chosen */
224	u_quad_t ip6s_sources_sameif[16];
225	/* number of times that an address on a non-outgoing I/F is chosen */
226	u_quad_t ip6s_sources_otherif[16];
227	/*
228	 * number of times that an address that has the same scope
229	 * from the destination is chosen.
230	 */
231	u_quad_t ip6s_sources_samescope[16];
232	/*
233	 * number of times that an address that has a different scope
234	 * from the destination is chosen.
235	 */
236	u_quad_t ip6s_sources_otherscope[16];
237	/* number of times that a deprecated address is chosen */
238	u_quad_t ip6s_sources_deprecated[16];
239
240	/* number of times that each rule of source selection is applied. */
241	u_quad_t ip6s_sources_rule[16];
242};
243
244#ifdef _KERNEL
245#define	IP6STAT_ADD(name, val)	V_ip6stat.name += (val)
246#define	IP6STAT_SUB(name, val)	V_ip6stat.name -= (val)
247#define	IP6STAT_INC(name)	IP6STAT_ADD(name, 1)
248#define	IP6STAT_DEC(name)	IP6STAT_SUB(name, 1)
249#endif
250
251#ifdef _KERNEL
252/*
253 * IPv6 onion peeling state.
254 * it will be initialized when we come into ip6_input().
255 * XXX do not make it a kitchen sink!
256 */
257struct ip6aux {
258	u_int32_t ip6a_flags;
259#define IP6A_SWAP	0x01		/* swapped home/care-of on packet */
260#define IP6A_HASEEN	0x02		/* HA was present */
261#define IP6A_BRUID	0x04		/* BR Unique Identifier was present */
262#define IP6A_RTALERTSEEN 0x08		/* rtalert present */
263
264	/* ip6.ip6_src */
265	struct in6_addr ip6a_careof;	/* care-of address of the peer */
266	struct in6_addr ip6a_home;	/* home address of the peer */
267	u_int16_t	ip6a_bruid;	/* BR unique identifier */
268
269	/* ip6.ip6_dst */
270	struct in6_ifaddr *ip6a_dstia6;	/* my ifaddr that matches ip6_dst */
271
272	/* rtalert */
273	u_int16_t ip6a_rtalert;		/* rtalert option value */
274
275	/*
276	 * decapsulation history will be here.
277	 * with IPsec it may not be accurate.
278	 */
279};
280#endif
281
282#ifdef _KERNEL
283/* flags passed to ip6_output as last parameter */
284#define	IPV6_UNSPECSRC		0x01	/* allow :: as the source address */
285#define	IPV6_FORWARDING		0x02	/* most of IPv6 header exists */
286#define	IPV6_MINMTU		0x04	/* use minimum MTU (IPV6_USE_MIN_MTU) */
287
288#ifdef __NO_STRICT_ALIGNMENT
289#define IP6_HDR_ALIGNED_P(ip)	1
290#else
291#define IP6_HDR_ALIGNED_P(ip)	((((intptr_t) (ip)) & 3) == 0)
292#endif
293
294#ifdef VIMAGE_GLOBALS
295extern struct	ip6stat ip6stat;	/* statistics */
296extern int	ip6_defhlim;		/* default hop limit */
297extern int	ip6_defmcasthlim;	/* default multicast hop limit */
298extern int	ip6_forwarding;		/* act as router? */
299extern int	ip6_gif_hlim;		/* Hop limit for gif encap packet */
300extern int	ip6_use_deprecated;	/* allow deprecated addr as source */
301extern int	ip6_rr_prune;		/* router renumbering prefix
302					 * walk list every 5 sec.    */
303extern int	ip6_mcast_pmtu;		/* enable pMTU discovery for multicast? */
304extern int	ip6_v6only;
305extern struct socket *ip6_mrouter;	/* multicast routing daemon */
306extern int	ip6_sendredirects;	/* send IP redirects when forwarding? */
307extern int	ip6_maxfragpackets; /* Maximum packets in reassembly queue */
308extern int	ip6_maxfrags;	/* Maximum fragments in reassembly queue */
309extern int	ip6_accept_rtadv;	/* Acts as a host not a router */
310extern int	ip6_keepfaith;		/* Firewall Aided Internet Translator */
311extern int	ip6_log_interval;
312extern time_t	ip6_log_time;
313extern int	ip6_hdrnestlimit; /* upper limit of # of extension headers */
314extern int	ip6_dad_count;		/* DupAddrDetectionTransmits */
315
316extern int	ip6_auto_flowlabel;
317extern int	ip6_auto_linklocal;
318
319extern int	ip6_use_tempaddr; /* whether to use temporary addresses. */
320extern int	ip6_prefer_tempaddr; /* whether to prefer temporary addresses
321					in the source address selection */
322
323#ifdef IPSTEALTH
324extern int	ip6stealth;
325#endif
326
327extern int	ip6_use_defzone; /* whether to use the default scope zone
328				    when unspecified */
329#endif /* VIMAGE_GLOBALS */
330
331extern	struct pfil_head inet6_pfil_hook;	/* packet filter hooks */
332
333extern struct	pr_usrreqs rip6_usrreqs;
334struct sockopt;
335
336struct inpcb;
337
338int	icmp6_ctloutput __P((struct socket *, struct sockopt *sopt));
339
340struct in6_ifaddr;
341void	ip6_init __P((void));
342#ifdef VIMAGE
343void	ip6_destroy __P((void));
344#endif
345void	ip6_input __P((struct mbuf *));
346struct in6_ifaddr *ip6_getdstifaddr __P((struct mbuf *));
347void	ip6_freepcbopts __P((struct ip6_pktopts *));
348
349int	ip6_unknown_opt __P((u_int8_t *, struct mbuf *, int));
350char *	ip6_get_prevhdr __P((struct mbuf *, int));
351int	ip6_nexthdr __P((struct mbuf *, int, int, int *));
352int	ip6_lasthdr __P((struct mbuf *, int, int, int *));
353
354struct ip6aux *ip6_addaux __P((struct mbuf *));
355struct ip6aux *ip6_findaux __P((struct mbuf *));
356void	ip6_delaux __P((struct mbuf *));
357
358extern int	(*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
359    struct mbuf *);
360
361int	ip6_process_hopopts __P((struct mbuf *, u_int8_t *, int, u_int32_t *,
362				 u_int32_t *));
363struct mbuf	**ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
364	    struct mbuf **, int *);
365void	ip6_savecontrol __P((struct inpcb *, struct mbuf *, struct mbuf **));
366void	ip6_notify_pmtu __P((struct inpcb *, struct sockaddr_in6 *,
367			     u_int32_t *));
368int	ip6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
369
370void	ip6_forward __P((struct mbuf *, int));
371
372void	ip6_mloopback __P((struct ifnet *, struct mbuf *, struct sockaddr_in6 *));
373int	ip6_output __P((struct mbuf *, struct ip6_pktopts *,
374			struct route_in6 *,
375			int,
376			struct ip6_moptions *, struct ifnet **,
377			struct inpcb *));
378int	ip6_ctloutput __P((struct socket *, struct sockopt *));
379int	ip6_raw_ctloutput __P((struct socket *, struct sockopt *));
380void	ip6_initpktopts __P((struct ip6_pktopts *));
381int	ip6_setpktopts __P((struct mbuf *, struct ip6_pktopts *,
382	struct ip6_pktopts *, struct ucred *, int));
383void	ip6_clearpktopts __P((struct ip6_pktopts *, int));
384struct ip6_pktopts *ip6_copypktopts __P((struct ip6_pktopts *, int));
385int	ip6_optlen __P((struct inpcb *));
386
387int	route6_input __P((struct mbuf **, int *, int));
388
389void	frag6_init __P((void));
390int	frag6_input __P((struct mbuf **, int *, int));
391void	frag6_slowtimo __P((void));
392void	frag6_drain __P((void));
393
394void	rip6_init __P((void));
395int	rip6_input __P((struct mbuf **, int *, int));
396void	rip6_ctlinput __P((int, struct sockaddr *, void *));
397int	rip6_ctloutput __P((struct socket *, struct sockopt *));
398int	rip6_output __P((struct mbuf *, ...));
399int	rip6_usrreq __P((struct socket *,
400	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *));
401
402int	dest6_input __P((struct mbuf **, int *, int));
403int	none_input __P((struct mbuf **, int *, int));
404
405struct in6_addr *in6_selectsrc __P((struct sockaddr_in6 *, struct ip6_pktopts *,
406	struct inpcb *inp, struct route_in6 *, struct ucred *cred,
407	struct ifnet **, int *));
408int in6_selectroute __P((struct sockaddr_in6 *, struct ip6_pktopts *,
409	struct ip6_moptions *, struct route_in6 *, struct ifnet **,
410	struct rtentry **));
411u_int32_t ip6_randomid __P((void));
412u_int32_t ip6_randomflowlabel __P((void));
413#endif /* _KERNEL */
414
415#endif /* !_NETINET6_IP6_VAR_H_ */
416