Annotation of sys/netinet6/nd6.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: nd6.h,v 1.25 2003/07/08 21:43:18 itojun Exp $ */
2: /* $KAME: nd6.h,v 1.95 2002/06/08 11:31:06 itojun Exp $ */
3:
4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #ifndef _NETINET6_ND6_H_
34: #define _NETINET6_ND6_H_
35:
36: /* see net/route.h, or net/if_inarp.h */
37: #ifndef RTF_ANNOUNCE
38: #define RTF_ANNOUNCE RTF_PROTO2
39: #endif
40:
41: #include <sys/queue.h>
42: #include <sys/timeout.h>
43:
44: struct llinfo_nd6 {
45: struct llinfo_nd6 *ln_next;
46: struct llinfo_nd6 *ln_prev;
47: struct rtentry *ln_rt;
48: struct mbuf *ln_hold; /* last packet until resolved/timeout */
49: long ln_asked; /* number of queries already sent for this addr */
50: u_long ln_expire; /* lifetime for NDP state transition */
51: short ln_state; /* reachability state */
52: short ln_router; /* 2^0: ND6 router bit */
53: int ln_byhint; /* # of times we made it reachable by UL hint */
54:
55: long ln_ntick;
56: struct timeout ln_timer_ch;
57: };
58:
59: #define ND6_LLINFO_NOSTATE -2
60: /*
61: * We don't need the WAITDELETE state any more, but we keep the definition
62: * in a comment line instead of removing it. This is necessary to avoid
63: * unintentionally reusing the value for another purpose, which might
64: * affect backward compatibility with old applications.
65: * (20000711 jinmei@kame.net)
66: */
67: /* #define ND6_LLINFO_WAITDELETE -1 */
68: #define ND6_LLINFO_INCOMPLETE 0
69: #define ND6_LLINFO_REACHABLE 1
70: #define ND6_LLINFO_STALE 2
71: #define ND6_LLINFO_DELAY 3
72: #define ND6_LLINFO_PROBE 4
73:
74: #define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
75: #define ND6_LLINFO_PERMANENT(n) ((n)->ln_expire == 0)
76:
77: struct nd_ifinfo {
78: u_int32_t linkmtu; /* LinkMTU */
79: u_int32_t maxmtu; /* Upper bound of LinkMTU */
80: u_int32_t basereachable; /* BaseReachableTime */
81: u_int32_t reachable; /* Reachable Time */
82: u_int32_t retrans; /* Retrans Timer */
83: u_int32_t flags; /* Flags */
84: int recalctm; /* BaseReacable re-calculation timer */
85: u_int8_t chlim; /* CurHopLimit */
86: u_int8_t initialized; /* Flag to see the entry is initialized */
87: /* the following 3 members are for privacy extension for addrconf */
88: u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
89: u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
90: u_int8_t randomid[8]; /* current random ID */
91: };
92:
93: #define ND6_IFF_PERFORMNUD 0x1
94: #define ND6_IFF_ACCEPT_RTADV 0x2
95:
96: #ifdef _KERNEL
97: #define ND_IFINFO(ifp) \
98: (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
99: #define IN6_LINKMTU(ifp) \
100: ((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
101: ? ND_IFINFO(ifp)->linkmtu \
102: : ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
103: ? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
104: #endif
105:
106: struct in6_nbrinfo {
107: char ifname[IFNAMSIZ]; /* if name, e.g. "en0" */
108: struct in6_addr addr; /* IPv6 address of the neighbor */
109: long asked; /* number of queries already sent for this addr */
110: int isrouter; /* if it acts as a router */
111: int state; /* reachability state */
112: int expire; /* lifetime for NDP state transition */
113: };
114:
115: #define DRLSTSIZ 10
116: #define PRLSTSIZ 10
117: struct in6_drlist {
118: char ifname[IFNAMSIZ];
119: struct {
120: struct in6_addr rtaddr;
121: u_char flags;
122: u_short rtlifetime;
123: u_long expire;
124: u_short if_index;
125: } defrouter[DRLSTSIZ];
126: };
127:
128: struct in6_defrouter {
129: struct sockaddr_in6 rtaddr;
130: u_char flags;
131: u_short rtlifetime;
132: u_long expire;
133: u_short if_index;
134: };
135:
136: #ifdef _KERNEL
137: struct in6_oprlist {
138: char ifname[IFNAMSIZ];
139: struct {
140: struct in6_addr prefix;
141: struct prf_ra raflags;
142: u_char prefixlen;
143: u_char origin;
144: u_long vltime;
145: u_long pltime;
146: u_long expire;
147: u_short if_index;
148: u_short advrtrs; /* number of advertisement routers */
149: struct in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
150: } prefix[PRLSTSIZ];
151: };
152: #endif
153:
154: struct in6_prlist {
155: char ifname[IFNAMSIZ];
156: struct {
157: struct in6_addr prefix;
158: struct prf_ra raflags;
159: u_char prefixlen;
160: u_char origin;
161: u_int32_t vltime;
162: u_int32_t pltime;
163: time_t expire;
164: u_short if_index;
165: u_short advrtrs; /* number of advertisement routers */
166: struct in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
167: } prefix[PRLSTSIZ];
168: };
169:
170: struct in6_prefix {
171: struct sockaddr_in6 prefix;
172: struct prf_ra raflags;
173: u_char prefixlen;
174: u_char origin;
175: u_int32_t vltime;
176: u_int32_t pltime;
177: time_t expire;
178: u_int32_t flags;
179: int refcnt;
180: u_short if_index;
181: u_short advrtrs; /* number of advertisement routers */
182: /* struct sockaddr_in6 advrtr[] */
183: };
184:
185: #ifdef _KERNEL
186: struct in6_ondireq {
187: char ifname[IFNAMSIZ];
188: struct {
189: u_int32_t linkmtu; /* LinkMTU */
190: u_int32_t maxmtu; /* Upper bound of LinkMTU */
191: u_int32_t basereachable; /* BaseReachableTime */
192: u_int32_t reachable; /* Reachable Time */
193: u_int32_t retrans; /* Retrans Timer */
194: u_int32_t flags; /* Flags */
195: int recalctm; /* BaseReacable re-calculation timer */
196: u_int8_t chlim; /* CurHopLimit */
197: u_int8_t receivedra;
198: } ndi;
199: };
200: #endif
201:
202: struct in6_ndireq {
203: char ifname[IFNAMSIZ];
204: struct nd_ifinfo ndi;
205: };
206:
207: struct in6_ndifreq {
208: char ifname[IFNAMSIZ];
209: u_long ifindex;
210: };
211:
212: /* Prefix status */
213: #define NDPRF_ONLINK 0x1
214: #define NDPRF_DETACHED 0x2
215: #define NDPRF_HOME 0x4
216:
217: /* protocol constants */
218: #define MAX_RTR_SOLICITATION_DELAY 1 /*1sec*/
219: #define RTR_SOLICITATION_INTERVAL 4 /*4sec*/
220: #define MAX_RTR_SOLICITATIONS 3
221:
222: #define ND6_INFINITE_LIFETIME 0xffffffff
223:
224: #ifdef _KERNEL
225: /* node constants */
226: #define MAX_REACHABLE_TIME 3600000 /* msec */
227: #define REACHABLE_TIME 30000 /* msec */
228: #define RETRANS_TIMER 1000 /* msec */
229: #define MIN_RANDOM_FACTOR 512 /* 1024 * 0.5 */
230: #define MAX_RANDOM_FACTOR 1536 /* 1024 * 1.5 */
231: #define ND_COMPUTE_RTIME(x) \
232: (((MIN_RANDOM_FACTOR * (x >> 10)) + (arc4random() & \
233: ((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
234:
235: TAILQ_HEAD(nd_drhead, nd_defrouter);
236: struct nd_defrouter {
237: TAILQ_ENTRY(nd_defrouter) dr_entry;
238: struct in6_addr rtaddr;
239: u_char flags; /* flags on RA message */
240: u_short rtlifetime;
241: u_long expire;
242: struct ifnet *ifp;
243: int installed; /* is installed into kernel routing table */
244: };
245:
246: struct nd_prefix {
247: struct ifnet *ndpr_ifp;
248: LIST_ENTRY(nd_prefix) ndpr_entry;
249: struct sockaddr_in6 ndpr_prefix; /* prefix */
250: struct in6_addr ndpr_mask; /* netmask derived from the prefix */
251:
252: u_int32_t ndpr_vltime; /* advertised valid lifetime */
253: u_int32_t ndpr_pltime; /* advertised preferred lifetime */
254:
255: time_t ndpr_expire; /* expiration time of the prefix */
256: time_t ndpr_preferred; /* preferred time of the prefix */
257: time_t ndpr_lastupdate; /* reception time of last advertisement */
258:
259: struct prf_ra ndpr_flags;
260: u_int32_t ndpr_stateflags; /* actual state flags */
261: /* list of routers that advertise the prefix: */
262: LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
263: u_char ndpr_plen;
264: int ndpr_refcnt; /* reference couter from addresses */
265: };
266:
267: #define ndpr_next ndpr_entry.le_next
268:
269: #define ndpr_raf ndpr_flags
270: #define ndpr_raf_onlink ndpr_flags.onlink
271: #define ndpr_raf_auto ndpr_flags.autonomous
272: #define ndpr_raf_router ndpr_flags.router
273:
274: /*
275: * Message format for use in obtaining information about prefixes
276: * from inet6 sysctl function
277: */
278: struct inet6_ndpr_msghdr {
279: u_short inpm_msglen; /* to skip over non-understood messages */
280: u_char inpm_version; /* future binary compatibility */
281: u_char inpm_type; /* message type */
282: struct in6_addr inpm_prefix;
283: u_long prm_vltim;
284: u_long prm_pltime;
285: u_long prm_expire;
286: u_long prm_preferred;
287: struct in6_prflags prm_flags;
288: u_short prm_index; /* index for associated ifp */
289: u_char prm_plen; /* length of prefix in bits */
290: };
291:
292: #define prm_raf_onlink prm_flags.prf_ra.onlink
293: #define prm_raf_auto prm_flags.prf_ra.autonomous
294:
295: #define prm_statef_onlink prm_flags.prf_state.onlink
296:
297: #define prm_rrf_decrvalid prm_flags.prf_rr.decrvalid
298: #define prm_rrf_decrprefd prm_flags.prf_rr.decrprefd
299:
300: struct nd_pfxrouter {
301: LIST_ENTRY(nd_pfxrouter) pfr_entry;
302: #define pfr_next pfr_entry.le_next
303: struct nd_defrouter *router;
304: };
305:
306: LIST_HEAD(nd_prhead, nd_prefix);
307:
308: /* nd6.c */
309: extern int nd6_prune;
310: extern int nd6_delay;
311: extern int nd6_umaxtries;
312: extern int nd6_mmaxtries;
313: extern int nd6_useloopback;
314: extern int nd6_maxnudhint;
315: extern int nd6_gctimer;
316: extern struct llinfo_nd6 llinfo_nd6;
317: extern struct nd_drhead nd_defrouter;
318: extern struct nd_prhead nd_prefix;
319: extern int nd6_debug;
320:
321: #define nd6log(x) do { if (nd6_debug) log x; } while (0)
322:
323: extern struct timeout nd6_timer_ch;
324:
325: /* nd6_rtr.c */
326: extern int nd6_defifindex;
327:
328: union nd_opts {
329: struct nd_opt_hdr *nd_opt_array[9];
330: struct {
331: struct nd_opt_hdr *zero;
332: struct nd_opt_hdr *src_lladdr;
333: struct nd_opt_hdr *tgt_lladdr;
334: struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
335: struct nd_opt_rd_hdr *rh;
336: struct nd_opt_mtu *mtu;
337: struct nd_opt_hdr *search; /* multiple opts */
338: struct nd_opt_hdr *last; /* multiple opts */
339: int done;
340: struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
341: } nd_opt_each;
342: };
343: #define nd_opts_src_lladdr nd_opt_each.src_lladdr
344: #define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
345: #define nd_opts_pi nd_opt_each.pi_beg
346: #define nd_opts_pi_end nd_opt_each.pi_end
347: #define nd_opts_rh nd_opt_each.rh
348: #define nd_opts_mtu nd_opt_each.mtu
349: #define nd_opts_search nd_opt_each.search
350: #define nd_opts_last nd_opt_each.last
351: #define nd_opts_done nd_opt_each.done
352:
353: /* XXX: need nd6_var.h?? */
354: /* nd6.c */
355: void nd6_init(void);
356: struct nd_ifinfo *nd6_ifattach(struct ifnet *);
357: void nd6_ifdetach(struct nd_ifinfo *);
358: int nd6_is_addr_neighbor(struct sockaddr_in6 *, struct ifnet *);
359: void nd6_option_init(void *, int, union nd_opts *);
360: struct nd_opt_hdr *nd6_option(union nd_opts *);
361: int nd6_options(union nd_opts *);
362: struct rtentry *nd6_lookup(struct in6_addr *, int, struct ifnet *);
363: void nd6_setmtu(struct ifnet *);
364: void nd6_llinfo_settimer(struct llinfo_nd6 *, long);
365: void nd6_timer(void *);
366: void nd6_purge(struct ifnet *);
367: void nd6_nud_hint(struct rtentry *, struct in6_addr *, int);
368: int nd6_resolve(struct ifnet *, struct rtentry *,
369: struct mbuf *, struct sockaddr *, u_char *);
370: void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
371: int nd6_ioctl(u_long, caddr_t, struct ifnet *);
372: struct rtentry *nd6_cache_lladdr(struct ifnet *, struct in6_addr *,
373: char *, int, int, int);
374: int nd6_output(struct ifnet *, struct ifnet *, struct mbuf *,
375: struct sockaddr_in6 *, struct rtentry *);
376: int nd6_storelladdr(struct ifnet *, struct rtentry *, struct mbuf *,
377: struct sockaddr *, u_char *);
378: int nd6_sysctl(int, void *, size_t *, void *, size_t);
379: int nd6_need_cache(struct ifnet *);
380:
381: /* nd6_nbr.c */
382: void nd6_na_input(struct mbuf *, int, int);
383: void nd6_na_output(struct ifnet *, struct in6_addr *,
384: struct in6_addr *, u_long, int, struct sockaddr *);
385: void nd6_ns_input(struct mbuf *, int, int);
386: void nd6_ns_output(struct ifnet *, struct in6_addr *,
387: struct in6_addr *, struct llinfo_nd6 *, int);
388: caddr_t nd6_ifptomac(struct ifnet *);
389: void nd6_dad_start(struct ifaddr *, int *);
390: void nd6_dad_stop(struct ifaddr *);
391: void nd6_dad_duplicated(struct ifaddr *);
392:
393: /* nd6_rtr.c */
394: void nd6_rs_input(struct mbuf *, int, int);
395: void nd6_ra_input(struct mbuf *, int, int);
396: void prelist_del(struct nd_prefix *);
397: void defrouter_addreq(struct nd_defrouter *);
398: void defrouter_reset(void);
399: void defrouter_select(void);
400: void defrtrlist_del(struct nd_defrouter *);
401: void prelist_remove(struct nd_prefix *);
402: int prelist_update(struct nd_prefix *, struct nd_defrouter *, struct mbuf *);
403: int nd6_prelist_add(struct nd_prefix *, struct nd_defrouter *,
404: struct nd_prefix **);
405: int nd6_prefix_onlink(struct nd_prefix *);
406: int nd6_prefix_offlink(struct nd_prefix *);
407: void pfxlist_onlink_check(void);
408: struct nd_defrouter *defrouter_lookup(struct in6_addr *, struct ifnet *);
409: struct nd_prefix *nd6_prefix_lookup(struct nd_prefix *);
410: int in6_ifdel(struct ifnet *, struct in6_addr *);
411: int in6_init_prefix_ltimes(struct nd_prefix *ndpr);
412: void rt6_flush(struct in6_addr *, struct ifnet *);
413: int nd6_setdefaultiface(int);
414:
415: #endif /* _KERNEL */
416:
417: #endif /* _NETINET6_ND6_H_ */
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