34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/malloc.h>
38#include <sys/socket.h>
39#include <sys/sockio.h>
40#include <sys/jail.h>
41#include <sys/kernel.h>
42#include <sys/proc.h>
43#include <sys/syslog.h>
44#include <sys/md5.h>
45
46#include <net/if.h>
47#include <net/if_dl.h>
48#include <net/if_types.h>
49#include <net/route.h>
50#include <net/vnet.h>
51
52#include <netinet/in.h>
53#include <netinet/in_var.h>
54#include <netinet/if_ether.h>
55#include <netinet/in_pcb.h>
56#include <netinet/ip_var.h>
57#include <netinet/udp.h>
58#include <netinet/udp_var.h>
59
60#include <netinet/ip6.h>
61#include <netinet6/ip6_var.h>
62#include <netinet6/in6_var.h>
63#include <netinet6/in6_pcb.h>
64#include <netinet6/in6_ifattach.h>
65#include <netinet6/ip6_var.h>
66#include <netinet6/nd6.h>
67#include <netinet6/mld6_var.h>
68#include <netinet6/scope6_var.h>
69
70VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
71
72#ifdef IP6_AUTO_LINKLOCAL
73VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
74#else
75VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
76#endif
77
78VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
79#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
80
81VNET_DECLARE(struct inpcbinfo, ripcbinfo);
82#define V_ripcbinfo VNET(ripcbinfo)
83
84static int get_rand_ifid(struct ifnet *, struct in6_addr *);
85static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
86static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
87static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
88static int in6_ifattach_loopback(struct ifnet *);
89static void in6_purgemaddrs(struct ifnet *);
90
91#define EUI64_GBIT 0x01
92#define EUI64_UBIT 0x02
93#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
94#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
95#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
96#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
97#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
98
99#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
100#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
101
102/*
103 * Generate a last-resort interface identifier, when the machine has no
104 * IEEE802/EUI64 address sources.
105 * The goal here is to get an interface identifier that is
106 * (1) random enough and (2) does not change across reboot.
107 * We currently use MD5(hostname) for it.
108 *
109 * in6 - upper 64bits are preserved
110 */
111static int
112get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
113{
114 MD5_CTX ctxt;
115 struct prison *pr;
116 u_int8_t digest[16];
117 int hostnamelen;
118
119 pr = curthread->td_ucred->cr_prison;
120 mtx_lock(&pr->pr_mtx);
121 hostnamelen = strlen(pr->pr_hostname);
122#if 0
123 /* we need at least several letters as seed for ifid */
124 if (hostnamelen < 3) {
125 mtx_unlock(&pr->pr_mtx);
126 return -1;
127 }
128#endif
129
130 /* generate 8 bytes of pseudo-random value. */
131 bzero(&ctxt, sizeof(ctxt));
132 MD5Init(&ctxt);
133 MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
134 mtx_unlock(&pr->pr_mtx);
135 MD5Final(digest, &ctxt);
136
137 /* assumes sizeof(digest) > sizeof(ifid) */
138 bcopy(digest, &in6->s6_addr[8], 8);
139
140 /* make sure to set "u" bit to local, and "g" bit to individual. */
141 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
142 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
143
144 /* convert EUI64 into IPv6 interface identifier */
145 EUI64_TO_IFID(in6);
146
147 return 0;
148}
149
150static int
151generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
152{
153 MD5_CTX ctxt;
154 u_int8_t seed[16], digest[16], nullbuf[8];
155 u_int32_t val32;
156
157 /* If there's no history, start with a random seed. */
158 bzero(nullbuf, sizeof(nullbuf));
159 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
160 int i;
161
162 for (i = 0; i < 2; i++) {
163 val32 = arc4random();
164 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
165 }
166 } else
167 bcopy(seed0, seed, 8);
168
169 /* copy the right-most 64-bits of the given address */
170 /* XXX assumption on the size of IFID */
171 bcopy(seed1, &seed[8], 8);
172
173 if (0) { /* for debugging purposes only */
174 int i;
175
176 printf("generate_tmp_ifid: new randomized ID from: ");
177 for (i = 0; i < 16; i++)
178 printf("%02x", seed[i]);
179 printf(" ");
180 }
181
182 /* generate 16 bytes of pseudo-random value. */
183 bzero(&ctxt, sizeof(ctxt));
184 MD5Init(&ctxt);
185 MD5Update(&ctxt, seed, sizeof(seed));
186 MD5Final(digest, &ctxt);
187
188 /*
189 * RFC 3041 3.2.1. (3)
190 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
191 * left-most bit is numbered 0) to zero.
192 */
193 bcopy(digest, ret, 8);
194 ret[0] &= ~EUI64_UBIT;
195
196 /*
197 * XXX: we'd like to ensure that the generated value is not zero
198 * for simplicity. If the caclculated digest happens to be zero,
199 * use a random non-zero value as the last resort.
200 */
201 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
202 nd6log((LOG_INFO,
203 "generate_tmp_ifid: computed MD5 value is zero.\n"));
204
205 val32 = arc4random();
206 val32 = 1 + (val32 % (0xffffffff - 1));
207 }
208
209 /*
210 * RFC 3041 3.2.1. (4)
211 * Take the rightmost 64-bits of the MD5 digest and save them in
212 * stable storage as the history value to be used in the next
213 * iteration of the algorithm.
214 */
215 bcopy(&digest[8], seed0, 8);
216
217 if (0) { /* for debugging purposes only */
218 int i;
219
220 printf("to: ");
221 for (i = 0; i < 16; i++)
222 printf("%02x", digest[i]);
223 printf("\n");
224 }
225
226 return 0;
227}
228
229/*
230 * Get interface identifier for the specified interface.
231 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
232 *
233 * in6 - upper 64bits are preserved
234 */
235int
236in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
237{
238 struct ifaddr *ifa;
239 struct sockaddr_dl *sdl;
240 u_int8_t *addr;
241 size_t addrlen;
242 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
243 static u_int8_t allone[8] =
244 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
245
246 IF_ADDR_LOCK(ifp);
247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
248 if (ifa->ifa_addr->sa_family != AF_LINK)
249 continue;
250 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
251 if (sdl == NULL)
252 continue;
253 if (sdl->sdl_alen == 0)
254 continue;
255
256 goto found;
257 }
258 IF_ADDR_UNLOCK(ifp);
259
260 return -1;
261
262found:
263 IF_ADDR_LOCK_ASSERT(ifp);
264 addr = LLADDR(sdl);
265 addrlen = sdl->sdl_alen;
266
267 /* get EUI64 */
268 switch (ifp->if_type) {
269 case IFT_ETHER:
| 34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/malloc.h>
38#include <sys/socket.h>
39#include <sys/sockio.h>
40#include <sys/jail.h>
41#include <sys/kernel.h>
42#include <sys/proc.h>
43#include <sys/syslog.h>
44#include <sys/md5.h>
45
46#include <net/if.h>
47#include <net/if_dl.h>
48#include <net/if_types.h>
49#include <net/route.h>
50#include <net/vnet.h>
51
52#include <netinet/in.h>
53#include <netinet/in_var.h>
54#include <netinet/if_ether.h>
55#include <netinet/in_pcb.h>
56#include <netinet/ip_var.h>
57#include <netinet/udp.h>
58#include <netinet/udp_var.h>
59
60#include <netinet/ip6.h>
61#include <netinet6/ip6_var.h>
62#include <netinet6/in6_var.h>
63#include <netinet6/in6_pcb.h>
64#include <netinet6/in6_ifattach.h>
65#include <netinet6/ip6_var.h>
66#include <netinet6/nd6.h>
67#include <netinet6/mld6_var.h>
68#include <netinet6/scope6_var.h>
69
70VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
71
72#ifdef IP6_AUTO_LINKLOCAL
73VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
74#else
75VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
76#endif
77
78VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
79#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
80
81VNET_DECLARE(struct inpcbinfo, ripcbinfo);
82#define V_ripcbinfo VNET(ripcbinfo)
83
84static int get_rand_ifid(struct ifnet *, struct in6_addr *);
85static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
86static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
87static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
88static int in6_ifattach_loopback(struct ifnet *);
89static void in6_purgemaddrs(struct ifnet *);
90
91#define EUI64_GBIT 0x01
92#define EUI64_UBIT 0x02
93#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
94#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
95#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
96#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
97#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
98
99#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
100#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
101
102/*
103 * Generate a last-resort interface identifier, when the machine has no
104 * IEEE802/EUI64 address sources.
105 * The goal here is to get an interface identifier that is
106 * (1) random enough and (2) does not change across reboot.
107 * We currently use MD5(hostname) for it.
108 *
109 * in6 - upper 64bits are preserved
110 */
111static int
112get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
113{
114 MD5_CTX ctxt;
115 struct prison *pr;
116 u_int8_t digest[16];
117 int hostnamelen;
118
119 pr = curthread->td_ucred->cr_prison;
120 mtx_lock(&pr->pr_mtx);
121 hostnamelen = strlen(pr->pr_hostname);
122#if 0
123 /* we need at least several letters as seed for ifid */
124 if (hostnamelen < 3) {
125 mtx_unlock(&pr->pr_mtx);
126 return -1;
127 }
128#endif
129
130 /* generate 8 bytes of pseudo-random value. */
131 bzero(&ctxt, sizeof(ctxt));
132 MD5Init(&ctxt);
133 MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
134 mtx_unlock(&pr->pr_mtx);
135 MD5Final(digest, &ctxt);
136
137 /* assumes sizeof(digest) > sizeof(ifid) */
138 bcopy(digest, &in6->s6_addr[8], 8);
139
140 /* make sure to set "u" bit to local, and "g" bit to individual. */
141 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
142 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
143
144 /* convert EUI64 into IPv6 interface identifier */
145 EUI64_TO_IFID(in6);
146
147 return 0;
148}
149
150static int
151generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
152{
153 MD5_CTX ctxt;
154 u_int8_t seed[16], digest[16], nullbuf[8];
155 u_int32_t val32;
156
157 /* If there's no history, start with a random seed. */
158 bzero(nullbuf, sizeof(nullbuf));
159 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
160 int i;
161
162 for (i = 0; i < 2; i++) {
163 val32 = arc4random();
164 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
165 }
166 } else
167 bcopy(seed0, seed, 8);
168
169 /* copy the right-most 64-bits of the given address */
170 /* XXX assumption on the size of IFID */
171 bcopy(seed1, &seed[8], 8);
172
173 if (0) { /* for debugging purposes only */
174 int i;
175
176 printf("generate_tmp_ifid: new randomized ID from: ");
177 for (i = 0; i < 16; i++)
178 printf("%02x", seed[i]);
179 printf(" ");
180 }
181
182 /* generate 16 bytes of pseudo-random value. */
183 bzero(&ctxt, sizeof(ctxt));
184 MD5Init(&ctxt);
185 MD5Update(&ctxt, seed, sizeof(seed));
186 MD5Final(digest, &ctxt);
187
188 /*
189 * RFC 3041 3.2.1. (3)
190 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
191 * left-most bit is numbered 0) to zero.
192 */
193 bcopy(digest, ret, 8);
194 ret[0] &= ~EUI64_UBIT;
195
196 /*
197 * XXX: we'd like to ensure that the generated value is not zero
198 * for simplicity. If the caclculated digest happens to be zero,
199 * use a random non-zero value as the last resort.
200 */
201 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
202 nd6log((LOG_INFO,
203 "generate_tmp_ifid: computed MD5 value is zero.\n"));
204
205 val32 = arc4random();
206 val32 = 1 + (val32 % (0xffffffff - 1));
207 }
208
209 /*
210 * RFC 3041 3.2.1. (4)
211 * Take the rightmost 64-bits of the MD5 digest and save them in
212 * stable storage as the history value to be used in the next
213 * iteration of the algorithm.
214 */
215 bcopy(&digest[8], seed0, 8);
216
217 if (0) { /* for debugging purposes only */
218 int i;
219
220 printf("to: ");
221 for (i = 0; i < 16; i++)
222 printf("%02x", digest[i]);
223 printf("\n");
224 }
225
226 return 0;
227}
228
229/*
230 * Get interface identifier for the specified interface.
231 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
232 *
233 * in6 - upper 64bits are preserved
234 */
235int
236in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
237{
238 struct ifaddr *ifa;
239 struct sockaddr_dl *sdl;
240 u_int8_t *addr;
241 size_t addrlen;
242 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
243 static u_int8_t allone[8] =
244 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
245
246 IF_ADDR_LOCK(ifp);
247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
248 if (ifa->ifa_addr->sa_family != AF_LINK)
249 continue;
250 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
251 if (sdl == NULL)
252 continue;
253 if (sdl->sdl_alen == 0)
254 continue;
255
256 goto found;
257 }
258 IF_ADDR_UNLOCK(ifp);
259
260 return -1;
261
262found:
263 IF_ADDR_LOCK_ASSERT(ifp);
264 addr = LLADDR(sdl);
265 addrlen = sdl->sdl_alen;
266
267 /* get EUI64 */
268 switch (ifp->if_type) {
269 case IFT_ETHER:
|
270 case IFT_FDDI:
271 case IFT_ISO88025:
272 case IFT_ATM:
273 case IFT_IEEE1394:
274#ifdef IFT_IEEE80211
275 case IFT_IEEE80211:
276#endif
277 /* IEEE802/EUI64 cases - what others? */
278 /* IEEE1394 uses 16byte length address starting with EUI64 */
279 if (addrlen > 8)
280 addrlen = 8;
281
282 /* look at IEEE802/EUI64 only */
283 if (addrlen != 8 && addrlen != 6) {
284 IF_ADDR_UNLOCK(ifp);
285 return -1;
286 }
287
288 /*
289 * check for invalid MAC address - on bsdi, we see it a lot
290 * since wildboar configures all-zero MAC on pccard before
291 * card insertion.
292 */
293 if (bcmp(addr, allzero, addrlen) == 0) {
294 IF_ADDR_UNLOCK(ifp);
295 return -1;
296 }
297 if (bcmp(addr, allone, addrlen) == 0) {
298 IF_ADDR_UNLOCK(ifp);
299 return -1;
300 }
301
302 /* make EUI64 address */
303 if (addrlen == 8)
304 bcopy(addr, &in6->s6_addr[8], 8);
305 else if (addrlen == 6) {
306 in6->s6_addr[8] = addr[0];
307 in6->s6_addr[9] = addr[1];
308 in6->s6_addr[10] = addr[2];
309 in6->s6_addr[11] = 0xff;
310 in6->s6_addr[12] = 0xfe;
311 in6->s6_addr[13] = addr[3];
312 in6->s6_addr[14] = addr[4];
313 in6->s6_addr[15] = addr[5];
314 }
315 break;
316
317 case IFT_ARCNET:
318 if (addrlen != 1) {
319 IF_ADDR_UNLOCK(ifp);
320 return -1;
321 }
322 if (!addr[0]) {
323 IF_ADDR_UNLOCK(ifp);
324 return -1;
325 }
326
327 bzero(&in6->s6_addr[8], 8);
328 in6->s6_addr[15] = addr[0];
329
330 /*
331 * due to insufficient bitwidth, we mark it local.
332 */
333 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
334 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
335 break;
336
337 case IFT_GIF:
338#ifdef IFT_STF
339 case IFT_STF:
340#endif
341 /*
342 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
343 * however, IPv4 address is not very suitable as unique
344 * identifier source (can be renumbered).
345 * we don't do this.
346 */
347 IF_ADDR_UNLOCK(ifp);
348 return -1;
349
350 default:
351 IF_ADDR_UNLOCK(ifp);
352 return -1;
353 }
354
355 /* sanity check: g bit must not indicate "group" */
356 if (EUI64_GROUP(in6)) {
357 IF_ADDR_UNLOCK(ifp);
358 return -1;
359 }
360
361 /* convert EUI64 into IPv6 interface identifier */
362 EUI64_TO_IFID(in6);
363
364 /*
365 * sanity check: ifid must not be all zero, avoid conflict with
366 * subnet router anycast
367 */
368 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
369 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
370 IF_ADDR_UNLOCK(ifp);
371 return -1;
372 }
373
374 IF_ADDR_UNLOCK(ifp);
375 return 0;
376}
377
378/*
379 * Get interface identifier for the specified interface. If it is not
380 * available on ifp0, borrow interface identifier from other information
381 * sources.
382 *
383 * altifp - secondary EUI64 source
384 */
385static int
386get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
387 struct in6_addr *in6)
388{
389 struct ifnet *ifp;
390
391 /* first, try to get it from the interface itself */
392 if (in6_get_hw_ifid(ifp0, in6) == 0) {
393 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
394 if_name(ifp0)));
395 goto success;
396 }
397
398 /* try secondary EUI64 source. this basically is for ATM PVC */
399 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
400 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
401 if_name(ifp0), if_name(altifp)));
402 goto success;
403 }
404
405 /* next, try to get it from some other hardware interface */
406 IFNET_RLOCK_NOSLEEP();
407 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
408 if (ifp == ifp0)
409 continue;
410 if (in6_get_hw_ifid(ifp, in6) != 0)
411 continue;
412
413 /*
414 * to borrow ifid from other interface, ifid needs to be
415 * globally unique
416 */
417 if (IFID_UNIVERSAL(in6)) {
418 nd6log((LOG_DEBUG,
419 "%s: borrow interface identifier from %s\n",
420 if_name(ifp0), if_name(ifp)));
421 IFNET_RUNLOCK_NOSLEEP();
422 goto success;
423 }
424 }
425 IFNET_RUNLOCK_NOSLEEP();
426
427 /* last resort: get from random number source */
428 if (get_rand_ifid(ifp, in6) == 0) {
429 nd6log((LOG_DEBUG,
430 "%s: interface identifier generated by random number\n",
431 if_name(ifp0)));
432 goto success;
433 }
434
435 printf("%s: failed to get interface identifier\n", if_name(ifp0));
436 return -1;
437
438success:
439 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
440 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
441 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
442 in6->s6_addr[14], in6->s6_addr[15]));
443 return 0;
444}
445
446/*
447 * altifp - secondary EUI64 source
448 */
449static int
450in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
451{
452 struct in6_ifaddr *ia;
453 struct in6_aliasreq ifra;
454 struct nd_prefixctl pr0;
455 int i, error;
456
457 /*
458 * configure link-local address.
459 */
460 bzero(&ifra, sizeof(ifra));
461
462 /*
463 * in6_update_ifa() does not use ifra_name, but we accurately set it
464 * for safety.
465 */
466 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
467
468 ifra.ifra_addr.sin6_family = AF_INET6;
469 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
470 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
471 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
472 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
473 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
474 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
475 } else {
476 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
477 nd6log((LOG_ERR,
478 "%s: no ifid available\n", if_name(ifp)));
479 return (-1);
480 }
481 }
482 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
483 return (-1);
484
485 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
486 ifra.ifra_prefixmask.sin6_family = AF_INET6;
487 ifra.ifra_prefixmask.sin6_addr = in6mask64;
488 /* link-local addresses should NEVER expire. */
489 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
490 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
491
492 /*
493 * Now call in6_update_ifa() to do a bunch of procedures to configure
494 * a link-local address. We can set the 3rd argument to NULL, because
495 * we know there's no other link-local address on the interface
496 * and therefore we are adding one (instead of updating one).
497 */
498 if ((error = in6_update_ifa(ifp, &ifra, NULL,
499 IN6_IFAUPDATE_DADDELAY)) != 0) {
500 /*
501 * XXX: When the interface does not support IPv6, this call
502 * would fail in the SIOCSIFADDR ioctl. I believe the
503 * notification is rather confusing in this case, so just
504 * suppress it. (jinmei@kame.net 20010130)
505 */
506 if (error != EAFNOSUPPORT)
507 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
508 "configure a link-local address on %s "
509 "(errno=%d)\n",
510 if_name(ifp), error));
511 return (-1);
512 }
513
514 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
515#ifdef DIAGNOSTIC
516 if (!ia) {
517 panic("ia == NULL in in6_ifattach_linklocal");
518 /* NOTREACHED */
519 }
520#endif
521 ifa_free(&ia->ia_ifa);
522
523 /*
524 * Make the link-local prefix (fe80::%link/64) as on-link.
525 * Since we'd like to manage prefixes separately from addresses,
526 * we make an ND6 prefix structure for the link-local prefix,
527 * and add it to the prefix list as a never-expire prefix.
528 * XXX: this change might affect some existing code base...
529 */
530 bzero(&pr0, sizeof(pr0));
531 pr0.ndpr_ifp = ifp;
532 /* this should be 64 at this moment. */
533 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
534 pr0.ndpr_prefix = ifra.ifra_addr;
535 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
536 for (i = 0; i < 4; i++) {
537 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
538 in6mask64.s6_addr32[i];
539 }
540 /*
541 * Initialize parameters. The link-local prefix must always be
542 * on-link, and its lifetimes never expire.
543 */
544 pr0.ndpr_raf_onlink = 1;
545 pr0.ndpr_raf_auto = 1; /* probably meaningless */
546 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
547 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
548 /*
549 * Since there is no other link-local addresses, nd6_prefix_lookup()
550 * probably returns NULL. However, we cannot always expect the result.
551 * For example, if we first remove the (only) existing link-local
552 * address, and then reconfigure another one, the prefix is still
553 * valid with referring to the old link-local address.
554 */
555 if (nd6_prefix_lookup(&pr0) == NULL) {
556 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
557 return (error);
558 }
559
560 return 0;
561}
562
563/*
564 * ifp - must be IFT_LOOP
565 */
566static int
567in6_ifattach_loopback(struct ifnet *ifp)
568{
569 struct in6_aliasreq ifra;
570 int error;
571
572 bzero(&ifra, sizeof(ifra));
573
574 /*
575 * in6_update_ifa() does not use ifra_name, but we accurately set it
576 * for safety.
577 */
578 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
579
580 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
581 ifra.ifra_prefixmask.sin6_family = AF_INET6;
582 ifra.ifra_prefixmask.sin6_addr = in6mask128;
583
584 /*
585 * Always initialize ia_dstaddr (= broadcast address) to loopback
586 * address. Follows IPv4 practice - see in_ifinit().
587 */
588 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
589 ifra.ifra_dstaddr.sin6_family = AF_INET6;
590 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
591
592 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
593 ifra.ifra_addr.sin6_family = AF_INET6;
594 ifra.ifra_addr.sin6_addr = in6addr_loopback;
595
596 /* the loopback address should NEVER expire. */
597 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
598 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
599
600 /* we don't need to perform DAD on loopback interfaces. */
601 ifra.ifra_flags |= IN6_IFF_NODAD;
602
603 /* skip registration to the prefix list. XXX should be temporary. */
604 ifra.ifra_flags |= IN6_IFF_NOPFX;
605
606 /*
607 * We are sure that this is a newly assigned address, so we can set
608 * NULL to the 3rd arg.
609 */
610 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
611 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
612 "the loopback address on %s (errno=%d)\n",
613 if_name(ifp), error));
614 return (-1);
615 }
616
617 return 0;
618}
619
620/*
621 * compute NI group address, based on the current hostname setting.
622 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
623 *
624 * when ifp == NULL, the caller is responsible for filling scopeid.
625 */
626int
627in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
628 struct in6_addr *in6)
629{
630 struct prison *pr;
631 const char *p;
632 u_char *q;
633 MD5_CTX ctxt;
634 u_int8_t digest[16];
635 char l;
636 char n[64]; /* a single label must not exceed 63 chars */
637
638 /*
639 * If no name is given and namelen is -1,
640 * we try to do the hostname lookup ourselves.
641 */
642 if (!name && namelen == -1) {
643 pr = curthread->td_ucred->cr_prison;
644 mtx_lock(&pr->pr_mtx);
645 name = pr->pr_hostname;
646 namelen = strlen(name);
647 } else
648 pr = NULL;
649 if (!name || !namelen) {
650 if (pr != NULL)
651 mtx_unlock(&pr->pr_mtx);
652 return -1;
653 }
654
655 p = name;
656 while (p && *p && *p != '.' && p - name < namelen)
657 p++;
658 if (p == name || p - name > sizeof(n) - 1) {
659 if (pr != NULL)
660 mtx_unlock(&pr->pr_mtx);
661 return -1; /* label too long */
662 }
663 l = p - name;
664 strncpy(n, name, l);
665 if (pr != NULL)
666 mtx_unlock(&pr->pr_mtx);
667 n[(int)l] = '\0';
668 for (q = n; *q; q++) {
669 if ('A' <= *q && *q <= 'Z')
670 *q = *q - 'A' + 'a';
671 }
672
673 /* generate 8 bytes of pseudo-random value. */
674 bzero(&ctxt, sizeof(ctxt));
675 MD5Init(&ctxt);
676 MD5Update(&ctxt, &l, sizeof(l));
677 MD5Update(&ctxt, n, l);
678 MD5Final(digest, &ctxt);
679
680 bzero(in6, sizeof(*in6));
681 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
682 in6->s6_addr8[11] = 2;
683 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
684 if (in6_setscope(in6, ifp, NULL))
685 return (-1); /* XXX: should not fail */
686
687 return 0;
688}
689
690/*
691 * XXX multiple loopback interface needs more care. for instance,
692 * nodelocal address needs to be configured onto only one of them.
693 * XXX multiple link-local address case
694 *
695 * altifp - secondary EUI64 source
696 */
697void
698in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
699{
700 struct in6_ifaddr *ia;
701 struct in6_addr in6;
702
703 /* some of the interfaces are inherently not IPv6 capable */
704 switch (ifp->if_type) {
705 case IFT_PFLOG:
706 case IFT_PFSYNC:
707 case IFT_CARP:
708 return;
709 }
710
711 /*
712 * quirks based on interface type
713 */
714 switch (ifp->if_type) {
715#ifdef IFT_STF
716 case IFT_STF:
717 /*
718 * 6to4 interface is a very special kind of beast.
719 * no multicast, no linklocal. RFC2529 specifies how to make
720 * linklocals for 6to4 interface, but there's no use and
721 * it is rather harmful to have one.
722 */
723 goto statinit;
724#endif
725 default:
726 break;
727 }
728
729 /*
730 * usually, we require multicast capability to the interface
731 */
732 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
733 nd6log((LOG_INFO, "in6_ifattach: "
734 "%s is not multicast capable, IPv6 not enabled\n",
735 if_name(ifp)));
736 return;
737 }
738
739 /*
740 * assign loopback address for loopback interface.
741 * XXX multiple loopback interface case.
742 */
743 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
744 struct ifaddr *ifa;
745
746 in6 = in6addr_loopback;
747 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
748 if (ifa == NULL) {
749 if (in6_ifattach_loopback(ifp) != 0)
750 return;
751 } else
752 ifa_free(ifa);
753 }
754
755 /*
756 * assign a link-local address, if there's none.
757 */
758 if (ifp->if_type != IFT_BRIDGE &&
759 !(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
760 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
761 int error;
762
763 ia = in6ifa_ifpforlinklocal(ifp, 0);
764 if (ia == NULL) {
765 error = in6_ifattach_linklocal(ifp, altifp);
766#if 0
767 if (error)
768 log(LOG_NOTICE, "in6_ifattach_linklocal: "
769 "failed to add a link-local addr to %s\n",
770 if_name(ifp));
771#endif
772 } else
773 ifa_free(&ia->ia_ifa);
774 }
775
776#ifdef IFT_STF /* XXX */
777statinit:
778#endif
779
780 /* update dynamically. */
781 if (V_in6_maxmtu < ifp->if_mtu)
782 V_in6_maxmtu = ifp->if_mtu;
783}
784
785/*
786 * NOTE: in6_ifdetach() does not support loopback if at this moment.
787 * We don't need this function in bsdi, because interfaces are never removed
788 * from the ifnet list in bsdi.
789 */
790void
791in6_ifdetach(struct ifnet *ifp)
792{
793 struct in6_ifaddr *ia;
794 struct ifaddr *ifa, *next;
795 struct radix_node_head *rnh;
796 struct rtentry *rt;
797 short rtflags;
798 struct sockaddr_in6 sin6;
799 struct in6_multi_mship *imm;
800
801 /* remove neighbor management table */
802 nd6_purge(ifp);
803
804 /* nuke any of IPv6 addresses we have */
805 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
806 if (ifa->ifa_addr->sa_family != AF_INET6)
807 continue;
808 in6_purgeaddr(ifa);
809 }
810
811 /* undo everything done by in6_ifattach(), just in case */
812 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
813 if (ifa->ifa_addr->sa_family != AF_INET6
814 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
815 continue;
816 }
817
818 ia = (struct in6_ifaddr *)ifa;
819
820 /*
821 * leave from multicast groups we have joined for the interface
822 */
823 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
824 LIST_REMOVE(imm, i6mm_chain);
825 in6_leavegroup(imm);
826 }
827
828 /* remove from the routing table */
829 if ((ia->ia_flags & IFA_ROUTE) &&
830 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
831 rtflags = rt->rt_flags;
832 RTFREE_LOCKED(rt);
833 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
834 (struct sockaddr *)&ia->ia_addr,
835 (struct sockaddr *)&ia->ia_prefixmask,
836 rtflags, (struct rtentry **)0);
837 }
838
839 /* remove from the linked list */
840 IF_ADDR_LOCK(ifp);
841 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
842 IF_ADDR_UNLOCK(ifp);
843 ifa_free(ifa); /* if_addrhead */
844
845 IN6_IFADDR_WLOCK();
846 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
847 IN6_IFADDR_WUNLOCK();
848 ifa_free(ifa);
849 }
850
851 in6_pcbpurgeif0(&V_udbinfo, ifp);
852 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
853 /* leave from all multicast groups joined */
854 in6_purgemaddrs(ifp);
855
856 /*
857 * remove neighbor management table. we call it twice just to make
858 * sure we nuke everything. maybe we need just one call.
859 * XXX: since the first call did not release addresses, some prefixes
860 * might remain. We should call nd6_purge() again to release the
861 * prefixes after removing all addresses above.
862 * (Or can we just delay calling nd6_purge until at this point?)
863 */
864 nd6_purge(ifp);
865
866 /* remove route to link-local allnodes multicast (ff02::1) */
867 bzero(&sin6, sizeof(sin6));
868 sin6.sin6_len = sizeof(struct sockaddr_in6);
869 sin6.sin6_family = AF_INET6;
870 sin6.sin6_addr = in6addr_linklocal_allnodes;
871 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
872 /* XXX: should not fail */
873 return;
874 /* XXX grab lock first to avoid LOR */
875 rnh = rt_tables_get_rnh(0, AF_INET6);
876 if (rnh != NULL) {
877 RADIX_NODE_HEAD_LOCK(rnh);
878 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
879 if (rt) {
880 if (rt->rt_ifp == ifp)
881 rtexpunge(rt);
882 RTFREE_LOCKED(rt);
883 }
884 RADIX_NODE_HEAD_UNLOCK(rnh);
885 }
886}
887
888int
889in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
890 const u_int8_t *baseid, int generate)
891{
892 u_int8_t nullbuf[8];
893 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
894
895 bzero(nullbuf, sizeof(nullbuf));
896 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
897 /* we've never created a random ID. Create a new one. */
898 generate = 1;
899 }
900
901 if (generate) {
902 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
903
904 /* generate_tmp_ifid will update seedn and buf */
905 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
906 ndi->randomid);
907 }
908 bcopy(ndi->randomid, retbuf, 8);
909
910 return (0);
911}
912
913void
914in6_tmpaddrtimer(void *arg)
915{
916 CURVNET_SET((struct vnet *) arg);
917 struct nd_ifinfo *ndi;
918 u_int8_t nullbuf[8];
919 struct ifnet *ifp;
920
921 callout_reset(&V_in6_tmpaddrtimer_ch,
922 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
923 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
924
925 bzero(nullbuf, sizeof(nullbuf));
926 for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
927 ifp = TAILQ_NEXT(ifp, if_list)) {
928 ndi = ND_IFINFO(ifp);
929 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
930 /*
931 * We've been generating a random ID on this interface.
932 * Create a new one.
933 */
934 (void)generate_tmp_ifid(ndi->randomseed0,
935 ndi->randomseed1, ndi->randomid);
936 }
937 }
938
939 CURVNET_RESTORE();
940}
941
942static void
943in6_purgemaddrs(struct ifnet *ifp)
944{
945 LIST_HEAD(,in6_multi) purgeinms;
946 struct in6_multi *inm, *tinm;
947 struct ifmultiaddr *ifma;
948
949 LIST_INIT(&purgeinms);
950 IN6_MULTI_LOCK();
951
952 /*
953 * Extract list of in6_multi associated with the detaching ifp
954 * which the PF_INET6 layer is about to release.
955 * We need to do this as IF_ADDR_LOCK() may be re-acquired
956 * by code further down.
957 */
958 IF_ADDR_LOCK(ifp);
959 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
960 if (ifma->ifma_addr->sa_family != AF_INET6 ||
961 ifma->ifma_protospec == NULL)
962 continue;
963 inm = (struct in6_multi *)ifma->ifma_protospec;
964 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
965 }
966 IF_ADDR_UNLOCK(ifp);
967
968 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
969 LIST_REMOVE(inm, in6m_entry);
970 in6m_release_locked(inm);
971 }
972 mld_ifdetach(ifp);
973
974 IN6_MULTI_UNLOCK();
975}
| 271 case IFT_FDDI:
272 case IFT_ISO88025:
273 case IFT_ATM:
274 case IFT_IEEE1394:
275#ifdef IFT_IEEE80211
276 case IFT_IEEE80211:
277#endif
278 /* IEEE802/EUI64 cases - what others? */
279 /* IEEE1394 uses 16byte length address starting with EUI64 */
280 if (addrlen > 8)
281 addrlen = 8;
282
283 /* look at IEEE802/EUI64 only */
284 if (addrlen != 8 && addrlen != 6) {
285 IF_ADDR_UNLOCK(ifp);
286 return -1;
287 }
288
289 /*
290 * check for invalid MAC address - on bsdi, we see it a lot
291 * since wildboar configures all-zero MAC on pccard before
292 * card insertion.
293 */
294 if (bcmp(addr, allzero, addrlen) == 0) {
295 IF_ADDR_UNLOCK(ifp);
296 return -1;
297 }
298 if (bcmp(addr, allone, addrlen) == 0) {
299 IF_ADDR_UNLOCK(ifp);
300 return -1;
301 }
302
303 /* make EUI64 address */
304 if (addrlen == 8)
305 bcopy(addr, &in6->s6_addr[8], 8);
306 else if (addrlen == 6) {
307 in6->s6_addr[8] = addr[0];
308 in6->s6_addr[9] = addr[1];
309 in6->s6_addr[10] = addr[2];
310 in6->s6_addr[11] = 0xff;
311 in6->s6_addr[12] = 0xfe;
312 in6->s6_addr[13] = addr[3];
313 in6->s6_addr[14] = addr[4];
314 in6->s6_addr[15] = addr[5];
315 }
316 break;
317
318 case IFT_ARCNET:
319 if (addrlen != 1) {
320 IF_ADDR_UNLOCK(ifp);
321 return -1;
322 }
323 if (!addr[0]) {
324 IF_ADDR_UNLOCK(ifp);
325 return -1;
326 }
327
328 bzero(&in6->s6_addr[8], 8);
329 in6->s6_addr[15] = addr[0];
330
331 /*
332 * due to insufficient bitwidth, we mark it local.
333 */
334 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
335 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
336 break;
337
338 case IFT_GIF:
339#ifdef IFT_STF
340 case IFT_STF:
341#endif
342 /*
343 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
344 * however, IPv4 address is not very suitable as unique
345 * identifier source (can be renumbered).
346 * we don't do this.
347 */
348 IF_ADDR_UNLOCK(ifp);
349 return -1;
350
351 default:
352 IF_ADDR_UNLOCK(ifp);
353 return -1;
354 }
355
356 /* sanity check: g bit must not indicate "group" */
357 if (EUI64_GROUP(in6)) {
358 IF_ADDR_UNLOCK(ifp);
359 return -1;
360 }
361
362 /* convert EUI64 into IPv6 interface identifier */
363 EUI64_TO_IFID(in6);
364
365 /*
366 * sanity check: ifid must not be all zero, avoid conflict with
367 * subnet router anycast
368 */
369 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
370 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
371 IF_ADDR_UNLOCK(ifp);
372 return -1;
373 }
374
375 IF_ADDR_UNLOCK(ifp);
376 return 0;
377}
378
379/*
380 * Get interface identifier for the specified interface. If it is not
381 * available on ifp0, borrow interface identifier from other information
382 * sources.
383 *
384 * altifp - secondary EUI64 source
385 */
386static int
387get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
388 struct in6_addr *in6)
389{
390 struct ifnet *ifp;
391
392 /* first, try to get it from the interface itself */
393 if (in6_get_hw_ifid(ifp0, in6) == 0) {
394 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
395 if_name(ifp0)));
396 goto success;
397 }
398
399 /* try secondary EUI64 source. this basically is for ATM PVC */
400 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
401 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
402 if_name(ifp0), if_name(altifp)));
403 goto success;
404 }
405
406 /* next, try to get it from some other hardware interface */
407 IFNET_RLOCK_NOSLEEP();
408 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
409 if (ifp == ifp0)
410 continue;
411 if (in6_get_hw_ifid(ifp, in6) != 0)
412 continue;
413
414 /*
415 * to borrow ifid from other interface, ifid needs to be
416 * globally unique
417 */
418 if (IFID_UNIVERSAL(in6)) {
419 nd6log((LOG_DEBUG,
420 "%s: borrow interface identifier from %s\n",
421 if_name(ifp0), if_name(ifp)));
422 IFNET_RUNLOCK_NOSLEEP();
423 goto success;
424 }
425 }
426 IFNET_RUNLOCK_NOSLEEP();
427
428 /* last resort: get from random number source */
429 if (get_rand_ifid(ifp, in6) == 0) {
430 nd6log((LOG_DEBUG,
431 "%s: interface identifier generated by random number\n",
432 if_name(ifp0)));
433 goto success;
434 }
435
436 printf("%s: failed to get interface identifier\n", if_name(ifp0));
437 return -1;
438
439success:
440 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
441 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
442 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
443 in6->s6_addr[14], in6->s6_addr[15]));
444 return 0;
445}
446
447/*
448 * altifp - secondary EUI64 source
449 */
450static int
451in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
452{
453 struct in6_ifaddr *ia;
454 struct in6_aliasreq ifra;
455 struct nd_prefixctl pr0;
456 int i, error;
457
458 /*
459 * configure link-local address.
460 */
461 bzero(&ifra, sizeof(ifra));
462
463 /*
464 * in6_update_ifa() does not use ifra_name, but we accurately set it
465 * for safety.
466 */
467 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
468
469 ifra.ifra_addr.sin6_family = AF_INET6;
470 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
471 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
472 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
473 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
474 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
475 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
476 } else {
477 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
478 nd6log((LOG_ERR,
479 "%s: no ifid available\n", if_name(ifp)));
480 return (-1);
481 }
482 }
483 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
484 return (-1);
485
486 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
487 ifra.ifra_prefixmask.sin6_family = AF_INET6;
488 ifra.ifra_prefixmask.sin6_addr = in6mask64;
489 /* link-local addresses should NEVER expire. */
490 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
491 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
492
493 /*
494 * Now call in6_update_ifa() to do a bunch of procedures to configure
495 * a link-local address. We can set the 3rd argument to NULL, because
496 * we know there's no other link-local address on the interface
497 * and therefore we are adding one (instead of updating one).
498 */
499 if ((error = in6_update_ifa(ifp, &ifra, NULL,
500 IN6_IFAUPDATE_DADDELAY)) != 0) {
501 /*
502 * XXX: When the interface does not support IPv6, this call
503 * would fail in the SIOCSIFADDR ioctl. I believe the
504 * notification is rather confusing in this case, so just
505 * suppress it. (jinmei@kame.net 20010130)
506 */
507 if (error != EAFNOSUPPORT)
508 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
509 "configure a link-local address on %s "
510 "(errno=%d)\n",
511 if_name(ifp), error));
512 return (-1);
513 }
514
515 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
516#ifdef DIAGNOSTIC
517 if (!ia) {
518 panic("ia == NULL in in6_ifattach_linklocal");
519 /* NOTREACHED */
520 }
521#endif
522 ifa_free(&ia->ia_ifa);
523
524 /*
525 * Make the link-local prefix (fe80::%link/64) as on-link.
526 * Since we'd like to manage prefixes separately from addresses,
527 * we make an ND6 prefix structure for the link-local prefix,
528 * and add it to the prefix list as a never-expire prefix.
529 * XXX: this change might affect some existing code base...
530 */
531 bzero(&pr0, sizeof(pr0));
532 pr0.ndpr_ifp = ifp;
533 /* this should be 64 at this moment. */
534 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
535 pr0.ndpr_prefix = ifra.ifra_addr;
536 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
537 for (i = 0; i < 4; i++) {
538 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
539 in6mask64.s6_addr32[i];
540 }
541 /*
542 * Initialize parameters. The link-local prefix must always be
543 * on-link, and its lifetimes never expire.
544 */
545 pr0.ndpr_raf_onlink = 1;
546 pr0.ndpr_raf_auto = 1; /* probably meaningless */
547 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
548 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
549 /*
550 * Since there is no other link-local addresses, nd6_prefix_lookup()
551 * probably returns NULL. However, we cannot always expect the result.
552 * For example, if we first remove the (only) existing link-local
553 * address, and then reconfigure another one, the prefix is still
554 * valid with referring to the old link-local address.
555 */
556 if (nd6_prefix_lookup(&pr0) == NULL) {
557 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
558 return (error);
559 }
560
561 return 0;
562}
563
564/*
565 * ifp - must be IFT_LOOP
566 */
567static int
568in6_ifattach_loopback(struct ifnet *ifp)
569{
570 struct in6_aliasreq ifra;
571 int error;
572
573 bzero(&ifra, sizeof(ifra));
574
575 /*
576 * in6_update_ifa() does not use ifra_name, but we accurately set it
577 * for safety.
578 */
579 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
580
581 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
582 ifra.ifra_prefixmask.sin6_family = AF_INET6;
583 ifra.ifra_prefixmask.sin6_addr = in6mask128;
584
585 /*
586 * Always initialize ia_dstaddr (= broadcast address) to loopback
587 * address. Follows IPv4 practice - see in_ifinit().
588 */
589 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
590 ifra.ifra_dstaddr.sin6_family = AF_INET6;
591 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
592
593 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
594 ifra.ifra_addr.sin6_family = AF_INET6;
595 ifra.ifra_addr.sin6_addr = in6addr_loopback;
596
597 /* the loopback address should NEVER expire. */
598 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
599 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
600
601 /* we don't need to perform DAD on loopback interfaces. */
602 ifra.ifra_flags |= IN6_IFF_NODAD;
603
604 /* skip registration to the prefix list. XXX should be temporary. */
605 ifra.ifra_flags |= IN6_IFF_NOPFX;
606
607 /*
608 * We are sure that this is a newly assigned address, so we can set
609 * NULL to the 3rd arg.
610 */
611 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
612 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
613 "the loopback address on %s (errno=%d)\n",
614 if_name(ifp), error));
615 return (-1);
616 }
617
618 return 0;
619}
620
621/*
622 * compute NI group address, based on the current hostname setting.
623 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
624 *
625 * when ifp == NULL, the caller is responsible for filling scopeid.
626 */
627int
628in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
629 struct in6_addr *in6)
630{
631 struct prison *pr;
632 const char *p;
633 u_char *q;
634 MD5_CTX ctxt;
635 u_int8_t digest[16];
636 char l;
637 char n[64]; /* a single label must not exceed 63 chars */
638
639 /*
640 * If no name is given and namelen is -1,
641 * we try to do the hostname lookup ourselves.
642 */
643 if (!name && namelen == -1) {
644 pr = curthread->td_ucred->cr_prison;
645 mtx_lock(&pr->pr_mtx);
646 name = pr->pr_hostname;
647 namelen = strlen(name);
648 } else
649 pr = NULL;
650 if (!name || !namelen) {
651 if (pr != NULL)
652 mtx_unlock(&pr->pr_mtx);
653 return -1;
654 }
655
656 p = name;
657 while (p && *p && *p != '.' && p - name < namelen)
658 p++;
659 if (p == name || p - name > sizeof(n) - 1) {
660 if (pr != NULL)
661 mtx_unlock(&pr->pr_mtx);
662 return -1; /* label too long */
663 }
664 l = p - name;
665 strncpy(n, name, l);
666 if (pr != NULL)
667 mtx_unlock(&pr->pr_mtx);
668 n[(int)l] = '\0';
669 for (q = n; *q; q++) {
670 if ('A' <= *q && *q <= 'Z')
671 *q = *q - 'A' + 'a';
672 }
673
674 /* generate 8 bytes of pseudo-random value. */
675 bzero(&ctxt, sizeof(ctxt));
676 MD5Init(&ctxt);
677 MD5Update(&ctxt, &l, sizeof(l));
678 MD5Update(&ctxt, n, l);
679 MD5Final(digest, &ctxt);
680
681 bzero(in6, sizeof(*in6));
682 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
683 in6->s6_addr8[11] = 2;
684 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
685 if (in6_setscope(in6, ifp, NULL))
686 return (-1); /* XXX: should not fail */
687
688 return 0;
689}
690
691/*
692 * XXX multiple loopback interface needs more care. for instance,
693 * nodelocal address needs to be configured onto only one of them.
694 * XXX multiple link-local address case
695 *
696 * altifp - secondary EUI64 source
697 */
698void
699in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
700{
701 struct in6_ifaddr *ia;
702 struct in6_addr in6;
703
704 /* some of the interfaces are inherently not IPv6 capable */
705 switch (ifp->if_type) {
706 case IFT_PFLOG:
707 case IFT_PFSYNC:
708 case IFT_CARP:
709 return;
710 }
711
712 /*
713 * quirks based on interface type
714 */
715 switch (ifp->if_type) {
716#ifdef IFT_STF
717 case IFT_STF:
718 /*
719 * 6to4 interface is a very special kind of beast.
720 * no multicast, no linklocal. RFC2529 specifies how to make
721 * linklocals for 6to4 interface, but there's no use and
722 * it is rather harmful to have one.
723 */
724 goto statinit;
725#endif
726 default:
727 break;
728 }
729
730 /*
731 * usually, we require multicast capability to the interface
732 */
733 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
734 nd6log((LOG_INFO, "in6_ifattach: "
735 "%s is not multicast capable, IPv6 not enabled\n",
736 if_name(ifp)));
737 return;
738 }
739
740 /*
741 * assign loopback address for loopback interface.
742 * XXX multiple loopback interface case.
743 */
744 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
745 struct ifaddr *ifa;
746
747 in6 = in6addr_loopback;
748 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
749 if (ifa == NULL) {
750 if (in6_ifattach_loopback(ifp) != 0)
751 return;
752 } else
753 ifa_free(ifa);
754 }
755
756 /*
757 * assign a link-local address, if there's none.
758 */
759 if (ifp->if_type != IFT_BRIDGE &&
760 !(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
761 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
762 int error;
763
764 ia = in6ifa_ifpforlinklocal(ifp, 0);
765 if (ia == NULL) {
766 error = in6_ifattach_linklocal(ifp, altifp);
767#if 0
768 if (error)
769 log(LOG_NOTICE, "in6_ifattach_linklocal: "
770 "failed to add a link-local addr to %s\n",
771 if_name(ifp));
772#endif
773 } else
774 ifa_free(&ia->ia_ifa);
775 }
776
777#ifdef IFT_STF /* XXX */
778statinit:
779#endif
780
781 /* update dynamically. */
782 if (V_in6_maxmtu < ifp->if_mtu)
783 V_in6_maxmtu = ifp->if_mtu;
784}
785
786/*
787 * NOTE: in6_ifdetach() does not support loopback if at this moment.
788 * We don't need this function in bsdi, because interfaces are never removed
789 * from the ifnet list in bsdi.
790 */
791void
792in6_ifdetach(struct ifnet *ifp)
793{
794 struct in6_ifaddr *ia;
795 struct ifaddr *ifa, *next;
796 struct radix_node_head *rnh;
797 struct rtentry *rt;
798 short rtflags;
799 struct sockaddr_in6 sin6;
800 struct in6_multi_mship *imm;
801
802 /* remove neighbor management table */
803 nd6_purge(ifp);
804
805 /* nuke any of IPv6 addresses we have */
806 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
807 if (ifa->ifa_addr->sa_family != AF_INET6)
808 continue;
809 in6_purgeaddr(ifa);
810 }
811
812 /* undo everything done by in6_ifattach(), just in case */
813 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
814 if (ifa->ifa_addr->sa_family != AF_INET6
815 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
816 continue;
817 }
818
819 ia = (struct in6_ifaddr *)ifa;
820
821 /*
822 * leave from multicast groups we have joined for the interface
823 */
824 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
825 LIST_REMOVE(imm, i6mm_chain);
826 in6_leavegroup(imm);
827 }
828
829 /* remove from the routing table */
830 if ((ia->ia_flags & IFA_ROUTE) &&
831 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
832 rtflags = rt->rt_flags;
833 RTFREE_LOCKED(rt);
834 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
835 (struct sockaddr *)&ia->ia_addr,
836 (struct sockaddr *)&ia->ia_prefixmask,
837 rtflags, (struct rtentry **)0);
838 }
839
840 /* remove from the linked list */
841 IF_ADDR_LOCK(ifp);
842 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
843 IF_ADDR_UNLOCK(ifp);
844 ifa_free(ifa); /* if_addrhead */
845
846 IN6_IFADDR_WLOCK();
847 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
848 IN6_IFADDR_WUNLOCK();
849 ifa_free(ifa);
850 }
851
852 in6_pcbpurgeif0(&V_udbinfo, ifp);
853 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
854 /* leave from all multicast groups joined */
855 in6_purgemaddrs(ifp);
856
857 /*
858 * remove neighbor management table. we call it twice just to make
859 * sure we nuke everything. maybe we need just one call.
860 * XXX: since the first call did not release addresses, some prefixes
861 * might remain. We should call nd6_purge() again to release the
862 * prefixes after removing all addresses above.
863 * (Or can we just delay calling nd6_purge until at this point?)
864 */
865 nd6_purge(ifp);
866
867 /* remove route to link-local allnodes multicast (ff02::1) */
868 bzero(&sin6, sizeof(sin6));
869 sin6.sin6_len = sizeof(struct sockaddr_in6);
870 sin6.sin6_family = AF_INET6;
871 sin6.sin6_addr = in6addr_linklocal_allnodes;
872 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
873 /* XXX: should not fail */
874 return;
875 /* XXX grab lock first to avoid LOR */
876 rnh = rt_tables_get_rnh(0, AF_INET6);
877 if (rnh != NULL) {
878 RADIX_NODE_HEAD_LOCK(rnh);
879 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
880 if (rt) {
881 if (rt->rt_ifp == ifp)
882 rtexpunge(rt);
883 RTFREE_LOCKED(rt);
884 }
885 RADIX_NODE_HEAD_UNLOCK(rnh);
886 }
887}
888
889int
890in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
891 const u_int8_t *baseid, int generate)
892{
893 u_int8_t nullbuf[8];
894 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
895
896 bzero(nullbuf, sizeof(nullbuf));
897 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
898 /* we've never created a random ID. Create a new one. */
899 generate = 1;
900 }
901
902 if (generate) {
903 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
904
905 /* generate_tmp_ifid will update seedn and buf */
906 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
907 ndi->randomid);
908 }
909 bcopy(ndi->randomid, retbuf, 8);
910
911 return (0);
912}
913
914void
915in6_tmpaddrtimer(void *arg)
916{
917 CURVNET_SET((struct vnet *) arg);
918 struct nd_ifinfo *ndi;
919 u_int8_t nullbuf[8];
920 struct ifnet *ifp;
921
922 callout_reset(&V_in6_tmpaddrtimer_ch,
923 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
924 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
925
926 bzero(nullbuf, sizeof(nullbuf));
927 for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
928 ifp = TAILQ_NEXT(ifp, if_list)) {
929 ndi = ND_IFINFO(ifp);
930 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
931 /*
932 * We've been generating a random ID on this interface.
933 * Create a new one.
934 */
935 (void)generate_tmp_ifid(ndi->randomseed0,
936 ndi->randomseed1, ndi->randomid);
937 }
938 }
939
940 CURVNET_RESTORE();
941}
942
943static void
944in6_purgemaddrs(struct ifnet *ifp)
945{
946 LIST_HEAD(,in6_multi) purgeinms;
947 struct in6_multi *inm, *tinm;
948 struct ifmultiaddr *ifma;
949
950 LIST_INIT(&purgeinms);
951 IN6_MULTI_LOCK();
952
953 /*
954 * Extract list of in6_multi associated with the detaching ifp
955 * which the PF_INET6 layer is about to release.
956 * We need to do this as IF_ADDR_LOCK() may be re-acquired
957 * by code further down.
958 */
959 IF_ADDR_LOCK(ifp);
960 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
961 if (ifma->ifma_addr->sa_family != AF_INET6 ||
962 ifma->ifma_protospec == NULL)
963 continue;
964 inm = (struct in6_multi *)ifma->ifma_protospec;
965 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
966 }
967 IF_ADDR_UNLOCK(ifp);
968
969 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
970 LIST_REMOVE(inm, in6m_entry);
971 in6m_release_locked(inm);
972 }
973 mld_ifdetach(ifp);
974
975 IN6_MULTI_UNLOCK();
976}
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