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: src/sys/netinet6/ip6_var.h,v 1.45 2008/10/26 22:45:18 rwatson Exp $
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 */
71 struct 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
89 struct 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 struct ip6_moptions {
102 struct ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
103 u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
104 u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
105 LIST_HEAD(, in6_multi_mship) im6o_memberships;
106 };
107
108 /*
109 * Control options for outgoing packets
110 */
111
112 /* Routing header related info */
113 struct ip6po_rhinfo {
114 struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
115 struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
116 };
117 #define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
118 #define ip6po_route ip6po_rhinfo.ip6po_rhi_route
119
120 /* Nexthop related info */
121 struct ip6po_nhinfo {
122 struct sockaddr *ip6po_nhi_nexthop;
123 struct route_in6 ip6po_nhi_route; /* Route to the nexthop */
124 };
125 #define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
126 #define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
127
128 struct ip6_pktopts {
129 struct mbuf *ip6po_m; /* Pointer to mbuf storing the data */
130 int ip6po_hlim; /* Hoplimit for outgoing packets */
131
132 /* Outgoing IF/address information */
133 struct in6_pktinfo *ip6po_pktinfo;
134
135 /* Next-hop address information */
136 struct ip6po_nhinfo ip6po_nhinfo;
137
138 struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
139
140 /* Destination options header (before a routing header) */
141 struct ip6_dest *ip6po_dest1;
142
143 /* Routing header related info. */
144 struct ip6po_rhinfo ip6po_rhinfo;
145
146 /* Destination options header (after a routing header) */
147 struct ip6_dest *ip6po_dest2;
148
149 int ip6po_tclass; /* traffic class */
150
151 int ip6po_minmtu; /* fragment vs PMTU discovery policy */
152 #define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
153 #define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
154 #define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
155
156 int ip6po_prefer_tempaddr; /* whether temporary addresses are
157 preferred as source address */
158 #define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
159 #define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
160 #define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
161
162 int ip6po_flags;
163 #if 0 /* parameters in this block is obsolete. do not reuse the values. */
164 #define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
165 #define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
166 #endif
167 #define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
168 #define IP6PO_USECOA 0x08 /* use care of address */
169 };
170
171 /*
172 * Control options for incoming packets
173 */
174
175 struct ip6stat {
176 u_quad_t ip6s_total; /* total packets received */
177 u_quad_t ip6s_tooshort; /* packet too short */
178 u_quad_t ip6s_toosmall; /* not enough data */
179 u_quad_t ip6s_fragments; /* fragments received */
180 u_quad_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
181 u_quad_t ip6s_fragtimeout; /* fragments timed out */
182 u_quad_t ip6s_fragoverflow; /* fragments that exceeded limit */
183 u_quad_t ip6s_forward; /* packets forwarded */
184 u_quad_t ip6s_cantforward; /* packets rcvd for unreachable dest */
185 u_quad_t ip6s_redirectsent; /* packets forwarded on same net */
186 u_quad_t ip6s_delivered; /* datagrams delivered to upper level*/
187 u_quad_t ip6s_localout; /* total ip packets generated here */
188 u_quad_t ip6s_odropped; /* lost packets due to nobufs, etc. */
189 u_quad_t ip6s_reassembled; /* total packets reassembled ok */
190 u_quad_t ip6s_fragmented; /* datagrams successfully fragmented */
191 u_quad_t ip6s_ofragments; /* output fragments created */
192 u_quad_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
193 u_quad_t ip6s_badoptions; /* error in option processing */
194 u_quad_t ip6s_noroute; /* packets discarded due to no route */
195 u_quad_t ip6s_badvers; /* ip6 version != 6 */
196 u_quad_t ip6s_rawout; /* total raw ip packets generated */
197 u_quad_t ip6s_badscope; /* scope error */
198 u_quad_t ip6s_notmember; /* don't join this multicast group */
199 u_quad_t ip6s_nxthist[256]; /* next header history */
200 u_quad_t ip6s_m1; /* one mbuf */
201 u_quad_t ip6s_m2m[32]; /* two or more mbuf */
202 u_quad_t ip6s_mext1; /* one ext mbuf */
203 u_quad_t ip6s_mext2m; /* two or more ext mbuf */
204 u_quad_t ip6s_exthdrtoolong; /* ext hdr are not continuous */
205 u_quad_t ip6s_nogif; /* no match gif found */
206 u_quad_t ip6s_toomanyhdr; /* discarded due to too many headers */
207
208 /*
209 * statistics for improvement of the source address selection
210 * algorithm:
211 * XXX: hardcoded 16 = # of ip6 multicast scope types + 1
212 */
213 /* number of times that address selection fails */
214 u_quad_t ip6s_sources_none;
215 /* number of times that an address on the outgoing I/F is chosen */
216 u_quad_t ip6s_sources_sameif[16];
217 /* number of times that an address on a non-outgoing I/F is chosen */
218 u_quad_t ip6s_sources_otherif[16];
219 /*
220 * number of times that an address that has the same scope
221 * from the destination is chosen.
222 */
223 u_quad_t ip6s_sources_samescope[16];
224 /*
225 * number of times that an address that has a different scope
226 * from the destination is chosen.
227 */
228 u_quad_t ip6s_sources_otherscope[16];
229 /* number of times that a deprecated address is chosen */
230 u_quad_t ip6s_sources_deprecated[16];
231
232 u_quad_t ip6s_forward_cachehit;
233 u_quad_t ip6s_forward_cachemiss;
234
235 /* number of times that each rule of source selection is applied. */
236 u_quad_t ip6s_sources_rule[16];
237 };
238
239 #ifdef _KERNEL
240 /*
241 * IPv6 onion peeling state.
242 * it will be initialized when we come into ip6_input().
243 * XXX do not make it a kitchen sink!
244 */
245 struct ip6aux {
246 u_int32_t ip6a_flags;
247 #define IP6A_SWAP 0x01 /* swapped home/care-of on packet */
248 #define IP6A_HASEEN 0x02 /* HA was present */
249 #define IP6A_BRUID 0x04 /* BR Unique Identifier was present */
250 #define IP6A_RTALERTSEEN 0x08 /* rtalert present */
251
252 /* ip6.ip6_src */
253 struct in6_addr ip6a_careof; /* care-of address of the peer */
254 struct in6_addr ip6a_home; /* home address of the peer */
255 u_int16_t ip6a_bruid; /* BR unique identifier */
256
257 /* ip6.ip6_dst */
258 struct in6_ifaddr *ip6a_dstia6; /* my ifaddr that matches ip6_dst */
259
260 /* rtalert */
261 u_int16_t ip6a_rtalert; /* rtalert option value */
262
263 /*
264 * decapsulation history will be here.
265 * with IPsec it may not be accurate.
266 */
267 };
268 #endif
269
270 #ifdef _KERNEL
271 /* flags passed to ip6_output as last parameter */
272 #define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
273 #define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
274 #define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
275
276 #ifdef __NO_STRICT_ALIGNMENT
277 #define IP6_HDR_ALIGNED_P(ip) 1
278 #else
279 #define IP6_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
280 #endif
281
282 extern struct ip6stat ip6stat; /* statistics */
283 extern int ip6_defhlim; /* default hop limit */
284 extern int ip6_defmcasthlim; /* default multicast hop limit */
285 extern int ip6_forwarding; /* act as router? */
286 extern int ip6_forward_srcrt; /* forward src-routed? */
287 extern int ip6_gif_hlim; /* Hop limit for gif encap packet */
288 extern int ip6_use_deprecated; /* allow deprecated addr as source */
289 extern int ip6_rr_prune; /* router renumbering prefix
290 * walk list every 5 sec. */
291 extern int ip6_mcast_pmtu; /* enable pMTU discovery for multicast? */
292 extern int ip6_v6only;
293
294 extern struct socket *ip6_mrouter; /* multicast routing daemon */
295 extern int ip6_sendredirects; /* send IP redirects when forwarding? */
296 extern int ip6_maxfragpackets; /* Maximum packets in reassembly queue */
297 extern int ip6_maxfrags; /* Maximum fragments in reassembly queue */
298 extern int ip6_sourcecheck; /* Verify source interface */
299 extern int ip6_sourcecheck_interval; /* Interval between log messages */
300 extern int ip6_accept_rtadv; /* Acts as a host not a router */
301 extern int ip6_keepfaith; /* Firewall Aided Internet Translator */
302 extern int ip6_log_interval;
303 extern time_t ip6_log_time;
304 extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
305 extern int ip6_dad_count; /* DupAddrDetectionTransmits */
306
307 extern int ip6_auto_flowlabel;
308 extern int ip6_auto_linklocal;
309
310 extern int ip6_anonportmin; /* minimum ephemeral port */
311 extern int ip6_anonportmax; /* maximum ephemeral port */
312 extern int ip6_lowportmin; /* minimum reserved port */
313 extern int ip6_lowportmax; /* maximum reserved port */
314
315 extern int ip6_use_tempaddr; /* whether to use temporary addresses. */
316 extern int ip6_prefer_tempaddr; /* whether to prefer temporary addresses
317 in the source address selection */
318
319 extern int ip6_use_defzone; /* whether to use the default scope zone
320 when unspecified */
321
322 extern struct pfil_head inet6_pfil_hook; /* packet filter hooks */
323 #ifdef IPSTEALTH
324 extern int ip6stealth;
325 #endif
326
327 extern struct pr_usrreqs rip6_usrreqs;
328 struct sockopt;
329
330 struct inpcb;
331
332 int icmp6_ctloutput __P((struct socket *, struct sockopt *sopt));
333
334 struct in6_ifaddr;
335 void ip6_init __P((void));
336 void ip6_input __P((struct mbuf *));
337 struct in6_ifaddr *ip6_getdstifaddr __P((struct mbuf *));
338 void ip6_freepcbopts __P((struct ip6_pktopts *));
339 void ip6_freemoptions __P((struct ip6_moptions *));
340 int ip6_unknown_opt __P((u_int8_t *, struct mbuf *, int));
341 char * ip6_get_prevhdr __P((struct mbuf *, int));
342 int ip6_nexthdr __P((struct mbuf *, int, int, int *));
343 int ip6_lasthdr __P((struct mbuf *, int, int, int *));
344
345 struct ip6aux *ip6_addaux __P((struct mbuf *));
346 struct ip6aux *ip6_findaux __P((struct mbuf *));
347 void ip6_delaux __P((struct mbuf *));
348
349 extern int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
350 struct mbuf *);
351
352 int ip6_process_hopopts __P((struct mbuf *, u_int8_t *, int, u_int32_t *,
353 u_int32_t *));
354 struct mbuf **ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
355 struct mbuf **, int *);
356 void ip6_savecontrol __P((struct inpcb *, struct mbuf *, struct mbuf **));
357 void ip6_notify_pmtu __P((struct inpcb *, struct sockaddr_in6 *,
358 u_int32_t *));
359 int ip6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
360
361 void ip6_forward __P((struct mbuf *, int));
362
363 void ip6_mloopback __P((struct ifnet *, struct mbuf *, struct sockaddr_in6 *));
364 int ip6_output __P((struct mbuf *, struct ip6_pktopts *,
365 struct route_in6 *,
366 int,
367 struct ip6_moptions *, struct ifnet **,
368 struct inpcb *));
369 int ip6_ctloutput __P((struct socket *, struct sockopt *));
370 int ip6_raw_ctloutput __P((struct socket *, struct sockopt *));
371 void ip6_initpktopts __P((struct ip6_pktopts *));
372 int ip6_setpktopts __P((struct mbuf *, struct ip6_pktopts *,
373 struct ip6_pktopts *, struct ucred *, int));
374 void ip6_clearpktopts __P((struct ip6_pktopts *, int));
375 struct ip6_pktopts *ip6_copypktopts __P((struct ip6_pktopts *, int));
376 int ip6_optlen __P((struct inpcb *));
377
378 int route6_input __P((struct mbuf **, int *, int));
379
380 void frag6_init __P((void));
381 int frag6_input __P((struct mbuf **, int *, int));
382 void frag6_slowtimo __P((void));
383 void frag6_drain __P((void));
384
385 void rip6_init __P((void));
386 int rip6_input __P((struct mbuf **, int *, int));
387 void rip6_ctlinput __P((int, struct sockaddr *, void *));
388 int rip6_ctloutput __P((struct socket *, struct sockopt *));
389 int rip6_output __P((struct mbuf *, ...));
390 int rip6_usrreq __P((struct socket *,
391 int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *));
392
393 int dest6_input __P((struct mbuf **, int *, int));
394 int none_input __P((struct mbuf **, int *, int));
395
396 struct in6_addr *in6_selectsrc __P((struct sockaddr_in6 *, struct ip6_pktopts *,
397 struct inpcb *inp, struct route_in6 *, struct ucred *cred,
398 struct ifnet **, int *));
399 int in6_selectroute __P((struct sockaddr_in6 *, struct ip6_pktopts *,
400 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
401 struct rtentry **, int));
402 u_int32_t ip6_randomid __P((void));
403 u_int32_t ip6_randomflowlabel __P((void));
404 #endif /* _KERNEL */
405
406 #endif /* !_NETINET6_IP6_VAR_H_ */
407
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