in6_ifattach.c revision 252021
1209616Sjfv/*- 2209616Sjfv * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3294958Smarius * All rights reserved. 4209616Sjfv * 5209616Sjfv * Redistribution and use in source and binary forms, with or without 6209616Sjfv * modification, are permitted provided that the following conditions 7209616Sjfv * are met: 8209616Sjfv * 1. Redistributions of source code must retain the above copyright 9209616Sjfv * notice, this list of conditions and the following disclaimer. 10209616Sjfv * 2. Redistributions in binary form must reproduce the above copyright 11209616Sjfv * notice, this list of conditions and the following disclaimer in the 12209616Sjfv * documentation and/or other materials provided with the distribution. 13209616Sjfv * 3. Neither the name of the project nor the names of its contributors 14209616Sjfv * may be used to endorse or promote products derived from this software 15209616Sjfv * without specific prior written permission. 16209616Sjfv * 17209616Sjfv * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18209616Sjfv * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19209616Sjfv * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20209616Sjfv * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21209616Sjfv * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22209616Sjfv * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23209616Sjfv * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24209616Sjfv * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25209616Sjfv * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26209616Sjfv * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27209616Sjfv * SUCH DAMAGE. 28209616Sjfv * 29209616Sjfv * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 30209616Sjfv */ 31209616Sjfv 32209616Sjfv#include <sys/cdefs.h> 33209616Sjfv__FBSDID("$FreeBSD: stable/9/sys/netinet6/in6_ifattach.c 252021 2013-06-20 07:23:04Z hrs $"); 34209616Sjfv 35209616Sjfv#include <sys/param.h> 36209616Sjfv#include <sys/systm.h> 37209616Sjfv#include <sys/malloc.h> 38209616Sjfv#include <sys/socket.h> 39209616Sjfv#include <sys/sockio.h> 40209616Sjfv#include <sys/jail.h> 41269196Sjfv#include <sys/kernel.h> 42269196Sjfv#include <sys/proc.h> 43209616Sjfv#include <sys/syslog.h> 44209616Sjfv#include <sys/md5.h> 45209616Sjfv 46209616Sjfv#include <net/if.h> 47209616Sjfv#include <net/if_dl.h> 48209616Sjfv#include <net/if_types.h> 49209616Sjfv#include <net/route.h> 50209616Sjfv#include <net/vnet.h> 51209616Sjfv 52209616Sjfv#include <netinet/in.h> 53269196Sjfv#include <netinet/in_var.h> 54269196Sjfv#include <netinet/if_ether.h> 55269196Sjfv#include <netinet/in_pcb.h> 56269196Sjfv#include <netinet/ip_var.h> 57209616Sjfv#include <netinet/udp.h> 58209616Sjfv#include <netinet/udp_var.h> 59209616Sjfv 60209616Sjfv#include <netinet/ip6.h> 61209616Sjfv#include <netinet6/ip6_var.h> 62209616Sjfv#include <netinet6/in6_var.h> 63209616Sjfv#include <netinet6/in6_pcb.h> 64209616Sjfv#include <netinet6/in6_ifattach.h> 65209616Sjfv#include <netinet6/ip6_var.h> 66209616Sjfv#include <netinet6/nd6.h> 67209616Sjfv#include <netinet6/mld6_var.h> 68209616Sjfv#include <netinet6/scope6_var.h> 69209616Sjfv 70209616SjfvVNET_DEFINE(unsigned long, in6_maxmtu) = 0; 71209616Sjfv 72209616Sjfv#ifdef IP6_AUTO_LINKLOCAL 73209616SjfvVNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 74209616Sjfv#else 75209616SjfvVNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 76209616Sjfv#endif 77209616Sjfv 78209616SjfvVNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 79209616Sjfv#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 80209616Sjfv 81209616SjfvVNET_DECLARE(struct inpcbinfo, ripcbinfo); 82209616Sjfv#define V_ripcbinfo VNET(ripcbinfo) 83209616Sjfv 84209616Sjfvstatic int get_rand_ifid(struct ifnet *, struct in6_addr *); 85209616Sjfvstatic int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 86209616Sjfvstatic int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 87209616Sjfvstatic int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 88209616Sjfvstatic int in6_ifattach_loopback(struct ifnet *); 89209616Sjfvstatic void in6_purgemaddrs(struct ifnet *); 90209616Sjfv 91209616Sjfv#define EUI64_GBIT 0x01 92209616Sjfv#define EUI64_UBIT 0x02 93209616Sjfv#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 94209616Sjfv#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 95209616Sjfv#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 96209616Sjfv#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 97209616Sjfv#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 98209616Sjfv 99209616Sjfv#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 100209616Sjfv#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 101209616Sjfv 102209616Sjfv/* 103209616Sjfv * Generate a last-resort interface identifier, when the machine has no 104209616Sjfv * IEEE802/EUI64 address sources. 105209616Sjfv * The goal here is to get an interface identifier that is 106209616Sjfv * (1) random enough and (2) does not change across reboot. 107209616Sjfv * We currently use MD5(hostname) for it. 108209616Sjfv * 109209616Sjfv * in6 - upper 64bits are preserved 110209616Sjfv */ 111209616Sjfvstatic int 112209616Sjfvget_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 113209616Sjfv{ 114209616Sjfv MD5_CTX ctxt; 115209616Sjfv struct prison *pr; 116209616Sjfv u_int8_t digest[16]; 117209616Sjfv int hostnamelen; 118209616Sjfv 119209616Sjfv pr = curthread->td_ucred->cr_prison; 120209616Sjfv mtx_lock(&pr->pr_mtx); 121209616Sjfv hostnamelen = strlen(pr->pr_hostname); 122209616Sjfv#if 0 123209616Sjfv /* we need at least several letters as seed for ifid */ 124209616Sjfv if (hostnamelen < 3) { 125209616Sjfv mtx_unlock(&pr->pr_mtx); 126209616Sjfv return -1; 127209616Sjfv } 128209616Sjfv#endif 129209616Sjfv 130209616Sjfv /* generate 8 bytes of pseudo-random value. */ 131209616Sjfv bzero(&ctxt, sizeof(ctxt)); 132209616Sjfv MD5Init(&ctxt); 133209616Sjfv MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 134209616Sjfv mtx_unlock(&pr->pr_mtx); 135209616Sjfv MD5Final(digest, &ctxt); 136209616Sjfv 137209616Sjfv /* assumes sizeof(digest) > sizeof(ifid) */ 138209616Sjfv bcopy(digest, &in6->s6_addr[8], 8); 139209616Sjfv 140209616Sjfv /* make sure to set "u" bit to local, and "g" bit to individual. */ 141209616Sjfv in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 142209616Sjfv in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 143209616Sjfv 144209616Sjfv /* convert EUI64 into IPv6 interface identifier */ 145209616Sjfv EUI64_TO_IFID(in6); 146209616Sjfv 147209616Sjfv return 0; 148209616Sjfv} 149209616Sjfv 150209616Sjfvstatic int 151209616Sjfvgenerate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 152209616Sjfv{ 153209616Sjfv MD5_CTX ctxt; 154209616Sjfv u_int8_t seed[16], digest[16], nullbuf[8]; 155209616Sjfv u_int32_t val32; 156209616Sjfv 157209616Sjfv /* If there's no history, start with a random seed. */ 158209616Sjfv bzero(nullbuf, sizeof(nullbuf)); 159209616Sjfv if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 160209616Sjfv int i; 161209616Sjfv 162209616Sjfv for (i = 0; i < 2; i++) { 163209616Sjfv val32 = arc4random(); 164209616Sjfv bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 165209616Sjfv } 166209616Sjfv } else 167209616Sjfv bcopy(seed0, seed, 8); 168209616Sjfv 169209616Sjfv /* copy the right-most 64-bits of the given address */ 170209616Sjfv /* XXX assumption on the size of IFID */ 171209616Sjfv bcopy(seed1, &seed[8], 8); 172209616Sjfv 173209616Sjfv if (0) { /* for debugging purposes only */ 174209616Sjfv int i; 175209616Sjfv 176209616Sjfv printf("generate_tmp_ifid: new randomized ID from: "); 177209616Sjfv for (i = 0; i < 16; i++) 178209616Sjfv printf("%02x", seed[i]); 179209616Sjfv printf(" "); 180209616Sjfv } 181209616Sjfv 182209616Sjfv /* generate 16 bytes of pseudo-random value. */ 183209616Sjfv bzero(&ctxt, sizeof(ctxt)); 184209616Sjfv MD5Init(&ctxt); 185209616Sjfv MD5Update(&ctxt, seed, sizeof(seed)); 186209616Sjfv MD5Final(digest, &ctxt); 187209616Sjfv 188209616Sjfv /* 189209616Sjfv * RFC 3041 3.2.1. (3) 190209616Sjfv * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 191209616Sjfv * left-most bit is numbered 0) to zero. 192209616Sjfv */ 193209616Sjfv bcopy(digest, ret, 8); 194209616Sjfv ret[0] &= ~EUI64_UBIT; 195209616Sjfv 196209616Sjfv /* 197209616Sjfv * XXX: we'd like to ensure that the generated value is not zero 198209616Sjfv * for simplicity. If the caclculated digest happens to be zero, 199209616Sjfv * use a random non-zero value as the last resort. 200209616Sjfv */ 201209616Sjfv if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 202209616Sjfv nd6log((LOG_INFO, 203209616Sjfv "generate_tmp_ifid: computed MD5 value is zero.\n")); 204209616Sjfv 205209616Sjfv val32 = arc4random(); 206209616Sjfv val32 = 1 + (val32 % (0xffffffff - 1)); 207209616Sjfv } 208209616Sjfv 209209616Sjfv /* 210209616Sjfv * RFC 3041 3.2.1. (4) 211209616Sjfv * Take the rightmost 64-bits of the MD5 digest and save them in 212209616Sjfv * stable storage as the history value to be used in the next 213209616Sjfv * iteration of the algorithm. 214209616Sjfv */ 215209616Sjfv bcopy(&digest[8], seed0, 8); 216209616Sjfv 217209616Sjfv if (0) { /* for debugging purposes only */ 218209616Sjfv int i; 219209616Sjfv 220209616Sjfv printf("to: "); 221209616Sjfv for (i = 0; i < 16; i++) 222209616Sjfv printf("%02x", digest[i]); 223209616Sjfv printf("\n"); 224209616Sjfv } 225209616Sjfv 226209616Sjfv return 0; 227209616Sjfv} 228209616Sjfv 229209616Sjfv/* 230209616Sjfv * Get interface identifier for the specified interface. 231209616Sjfv * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 232209616Sjfv * 233209616Sjfv * in6 - upper 64bits are preserved 234209616Sjfv */ 235209616Sjfvint 236209616Sjfvin6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 237209616Sjfv{ 238209616Sjfv struct ifaddr *ifa; 239209616Sjfv struct sockaddr_dl *sdl; 240209616Sjfv u_int8_t *addr; 241209616Sjfv size_t addrlen; 242209616Sjfv static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 243209616Sjfv static u_int8_t allone[8] = 244209616Sjfv { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 245209616Sjfv 246209616Sjfv IF_ADDR_RLOCK(ifp); 247209616Sjfv TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 248209616Sjfv if (ifa->ifa_addr->sa_family != AF_LINK) 249209616Sjfv continue; 250209616Sjfv sdl = (struct sockaddr_dl *)ifa->ifa_addr; 251209616Sjfv if (sdl == NULL) 252209616Sjfv continue; 253209616Sjfv if (sdl->sdl_alen == 0) 254209616Sjfv continue; 255209616Sjfv 256209616Sjfv goto found; 257209616Sjfv } 258209616Sjfv IF_ADDR_RUNLOCK(ifp); 259209616Sjfv 260209616Sjfv return -1; 261209616Sjfv 262209616Sjfvfound: 263209616Sjfv IF_ADDR_LOCK_ASSERT(ifp); 264209616Sjfv addr = LLADDR(sdl); 265209616Sjfv addrlen = sdl->sdl_alen; 266209616Sjfv 267209616Sjfv /* get EUI64 */ 268209616Sjfv switch (ifp->if_type) { 269209616Sjfv case IFT_ETHER: 270209616Sjfv case IFT_L2VLAN: 271209616Sjfv case IFT_FDDI: 272209616Sjfv case IFT_ISO88025: 273209616Sjfv case IFT_ATM: 274209616Sjfv case IFT_IEEE1394: 275209616Sjfv#ifdef IFT_IEEE80211 276209616Sjfv case IFT_IEEE80211: 277209616Sjfv#endif 278209616Sjfv /* IEEE802/EUI64 cases - what others? */ 279209616Sjfv /* IEEE1394 uses 16byte length address starting with EUI64 */ 280209616Sjfv if (addrlen > 8) 281209616Sjfv addrlen = 8; 282209616Sjfv 283209616Sjfv /* look at IEEE802/EUI64 only */ 284209616Sjfv if (addrlen != 8 && addrlen != 6) { 285209616Sjfv IF_ADDR_RUNLOCK(ifp); 286209616Sjfv return -1; 287209616Sjfv } 288209616Sjfv 289209616Sjfv /* 290209616Sjfv * check for invalid MAC address - on bsdi, we see it a lot 291209616Sjfv * since wildboar configures all-zero MAC on pccard before 292209616Sjfv * card insertion. 293209616Sjfv */ 294209616Sjfv if (bcmp(addr, allzero, addrlen) == 0) { 295209616Sjfv IF_ADDR_RUNLOCK(ifp); 296209616Sjfv return -1; 297209616Sjfv } 298209616Sjfv if (bcmp(addr, allone, addrlen) == 0) { 299209616Sjfv IF_ADDR_RUNLOCK(ifp); 300209616Sjfv return -1; 301209616Sjfv } 302209616Sjfv 303209616Sjfv /* make EUI64 address */ 304209616Sjfv if (addrlen == 8) 305209616Sjfv bcopy(addr, &in6->s6_addr[8], 8); 306209616Sjfv else if (addrlen == 6) { 307209616Sjfv in6->s6_addr[8] = addr[0]; 308209616Sjfv in6->s6_addr[9] = addr[1]; 309209616Sjfv in6->s6_addr[10] = addr[2]; 310209616Sjfv in6->s6_addr[11] = 0xff; 311209616Sjfv in6->s6_addr[12] = 0xfe; 312209616Sjfv in6->s6_addr[13] = addr[3]; 313209616Sjfv in6->s6_addr[14] = addr[4]; 314209616Sjfv in6->s6_addr[15] = addr[5]; 315209616Sjfv } 316209616Sjfv break; 317209616Sjfv 318209616Sjfv case IFT_ARCNET: 319209616Sjfv if (addrlen != 1) { 320209616Sjfv IF_ADDR_RUNLOCK(ifp); 321209616Sjfv return -1; 322209616Sjfv } 323209616Sjfv if (!addr[0]) { 324209616Sjfv IF_ADDR_RUNLOCK(ifp); 325209616Sjfv return -1; 326209616Sjfv } 327209616Sjfv 328209616Sjfv bzero(&in6->s6_addr[8], 8); 329209616Sjfv in6->s6_addr[15] = addr[0]; 330209616Sjfv 331209616Sjfv /* 332209616Sjfv * due to insufficient bitwidth, we mark it local. 333209616Sjfv */ 334209616Sjfv in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 335209616Sjfv in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 336209616Sjfv break; 337209616Sjfv 338209616Sjfv case IFT_GIF: 339209616Sjfv#ifdef IFT_STF 340209616Sjfv case IFT_STF: 341209616Sjfv#endif 342209616Sjfv /* 343209616Sjfv * RFC2893 says: "SHOULD use IPv4 address as ifid source". 344209616Sjfv * however, IPv4 address is not very suitable as unique 345209616Sjfv * identifier source (can be renumbered). 346209616Sjfv * we don't do this. 347209616Sjfv */ 348209616Sjfv IF_ADDR_RUNLOCK(ifp); 349209616Sjfv return -1; 350209616Sjfv 351209616Sjfv default: 352209616Sjfv IF_ADDR_RUNLOCK(ifp); 353209616Sjfv return -1; 354209616Sjfv } 355209616Sjfv 356209616Sjfv /* sanity check: g bit must not indicate "group" */ 357209616Sjfv if (EUI64_GROUP(in6)) { 358209616Sjfv IF_ADDR_RUNLOCK(ifp); 359209616Sjfv return -1; 360269196Sjfv } 361269196Sjfv 362209616Sjfv /* convert EUI64 into IPv6 interface identifier */ 363209616Sjfv EUI64_TO_IFID(in6); 364209616Sjfv 365209616Sjfv /* 366209616Sjfv * sanity check: ifid must not be all zero, avoid conflict with 367209616Sjfv * subnet router anycast 368209616Sjfv */ 369209616Sjfv if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 370209616Sjfv bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 371209616Sjfv IF_ADDR_RUNLOCK(ifp); 372209616Sjfv return -1; 373209616Sjfv } 374209616Sjfv 375209616Sjfv IF_ADDR_RUNLOCK(ifp); 376209616Sjfv return 0; 377209616Sjfv} 378209616Sjfv 379209616Sjfv/* 380209616Sjfv * Get interface identifier for the specified interface. If it is not 381209616Sjfv * available on ifp0, borrow interface identifier from other information 382269196Sjfv * sources. 383269196Sjfv * 384209616Sjfv * altifp - secondary EUI64 source 385209616Sjfv */ 386209616Sjfvstatic int 387209616Sjfvget_ifid(struct ifnet *ifp0, struct ifnet *altifp, 388209616Sjfv struct in6_addr *in6) 389209616Sjfv{ 390209616Sjfv struct ifnet *ifp; 391209616Sjfv 392209616Sjfv /* first, try to get it from the interface itself */ 393209616Sjfv if (in6_get_hw_ifid(ifp0, in6) == 0) { 394209616Sjfv nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 395209616Sjfv if_name(ifp0))); 396209616Sjfv goto success; 397209616Sjfv } 398209616Sjfv 399209616Sjfv /* try secondary EUI64 source. this basically is for ATM PVC */ 400209616Sjfv if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 401209616Sjfv nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 402209616Sjfv if_name(ifp0), if_name(altifp))); 403209616Sjfv goto success; 404269196Sjfv } 405269196Sjfv 406209616Sjfv /* next, try to get it from some other hardware interface */ 407209616Sjfv IFNET_RLOCK_NOSLEEP(); 408209616Sjfv TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 409209616Sjfv if (ifp == ifp0) 410209616Sjfv continue; 411209616Sjfv if (in6_get_hw_ifid(ifp, in6) != 0) 412269196Sjfv continue; 413209616Sjfv 414209616Sjfv /* 415209616Sjfv * to borrow ifid from other interface, ifid needs to be 416209616Sjfv * globally unique 417209616Sjfv */ 418209616Sjfv if (IFID_UNIVERSAL(in6)) { 419209616Sjfv nd6log((LOG_DEBUG, 420209616Sjfv "%s: borrow interface identifier from %s\n", 421209616Sjfv if_name(ifp0), if_name(ifp))); 422209616Sjfv IFNET_RUNLOCK_NOSLEEP(); 423209616Sjfv goto success; 424209616Sjfv } 425209616Sjfv } 426209616Sjfv IFNET_RUNLOCK_NOSLEEP(); 427209616Sjfv 428209616Sjfv /* last resort: get from random number source */ 429296055Serj if (get_rand_ifid(ifp, in6) == 0) { 430209616Sjfv nd6log((LOG_DEBUG, 431209616Sjfv "%s: interface identifier generated by random number\n", 432209616Sjfv if_name(ifp0))); 433296055Serj goto success; 434296055Serj } 435296055Serj 436209616Sjfv printf("%s: failed to get interface identifier\n", if_name(ifp0)); 437296055Serj return -1; 438296055Serj 439296055Serjsuccess: 440296055Serj nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 441296055Serj if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 442296055Serj in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 443296055Serj in6->s6_addr[14], in6->s6_addr[15])); 444209616Sjfv return 0; 445209616Sjfv} 446209616Sjfv 447209616Sjfv/* 448209616Sjfv * altifp - secondary EUI64 source 449209616Sjfv */ 450209616Sjfvstatic int 451209616Sjfvin6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 452209616Sjfv{ 453209616Sjfv struct in6_ifaddr *ia; 454209616Sjfv struct in6_aliasreq ifra; 455209616Sjfv struct nd_prefixctl pr0; 456209616Sjfv int i, error; 457209616Sjfv 458269196Sjfv /* 459209616Sjfv * configure link-local address. 460209616Sjfv */ 461209616Sjfv bzero(&ifra, sizeof(ifra)); 462209616Sjfv 463209616Sjfv /* 464209616Sjfv * in6_update_ifa() does not use ifra_name, but we accurately set it 465209616Sjfv * for safety. 466209616Sjfv */ 467209616Sjfv strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 468209616Sjfv 469209616Sjfv ifra.ifra_addr.sin6_family = AF_INET6; 470209616Sjfv ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 471209616Sjfv ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 472209616Sjfv ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 473209616Sjfv if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 474209616Sjfv ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 475209616Sjfv ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 476209616Sjfv } else { 477209616Sjfv if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 478209616Sjfv nd6log((LOG_ERR, 479209616Sjfv "%s: no ifid available\n", if_name(ifp))); 480209616Sjfv return (-1); 481209616Sjfv } 482209616Sjfv } 483209616Sjfv if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 484209616Sjfv return (-1); 485209616Sjfv 486209616Sjfv ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 487209616Sjfv ifra.ifra_prefixmask.sin6_family = AF_INET6; 488209616Sjfv ifra.ifra_prefixmask.sin6_addr = in6mask64; 489209616Sjfv /* link-local addresses should NEVER expire. */ 490209616Sjfv ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 491209616Sjfv ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 492209616Sjfv 493209616Sjfv /* 494209616Sjfv * Now call in6_update_ifa() to do a bunch of procedures to configure 495209616Sjfv * a link-local address. We can set the 3rd argument to NULL, because 496209616Sjfv * we know there's no other link-local address on the interface 497209616Sjfv * and therefore we are adding one (instead of updating one). 498209616Sjfv */ 499269196Sjfv if ((error = in6_update_ifa(ifp, &ifra, NULL, 500209616Sjfv IN6_IFAUPDATE_DADDELAY)) != 0) { 501209616Sjfv /* 502209616Sjfv * XXX: When the interface does not support IPv6, this call 503209616Sjfv * would fail in the SIOCSIFADDR ioctl. I believe the 504209616Sjfv * notification is rather confusing in this case, so just 505209616Sjfv * suppress it. (jinmei@kame.net 20010130) 506209616Sjfv */ 507209616Sjfv if (error != EAFNOSUPPORT) 508209616Sjfv nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 509209616Sjfv "configure a link-local address on %s " 510209616Sjfv "(errno=%d)\n", 511209616Sjfv if_name(ifp), error)); 512209616Sjfv return (-1); 513209616Sjfv } 514209616Sjfv 515209616Sjfv ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 516209616Sjfv KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 517209616Sjfv 518209616Sjfv ifa_free(&ia->ia_ifa); 519209616Sjfv 520209616Sjfv /* 521209616Sjfv * Make the link-local prefix (fe80::%link/64) as on-link. 522209616Sjfv * Since we'd like to manage prefixes separately from addresses, 523209616Sjfv * we make an ND6 prefix structure for the link-local prefix, 524209616Sjfv * and add it to the prefix list as a never-expire prefix. 525209616Sjfv * XXX: this change might affect some existing code base... 526209616Sjfv */ 527209616Sjfv bzero(&pr0, sizeof(pr0)); 528209616Sjfv pr0.ndpr_ifp = ifp; 529209616Sjfv /* this should be 64 at this moment. */ 530209616Sjfv pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 531209616Sjfv pr0.ndpr_prefix = ifra.ifra_addr; 532209616Sjfv /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 533209616Sjfv for (i = 0; i < 4; i++) { 534209616Sjfv pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 535209616Sjfv in6mask64.s6_addr32[i]; 536209616Sjfv } 537209616Sjfv /* 538209616Sjfv * Initialize parameters. The link-local prefix must always be 539209616Sjfv * on-link, and its lifetimes never expire. 540209616Sjfv */ 541209616Sjfv pr0.ndpr_raf_onlink = 1; 542209616Sjfv pr0.ndpr_raf_auto = 1; /* probably meaningless */ 543209616Sjfv pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 544209616Sjfv pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 545209616Sjfv /* 546209616Sjfv * Since there is no other link-local addresses, nd6_prefix_lookup() 547209616Sjfv * probably returns NULL. However, we cannot always expect the result. 548209616Sjfv * For example, if we first remove the (only) existing link-local 549209616Sjfv * address, and then reconfigure another one, the prefix is still 550209616Sjfv * valid with referring to the old link-local address. 551209616Sjfv */ 552209616Sjfv if (nd6_prefix_lookup(&pr0) == NULL) { 553209616Sjfv if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 554209616Sjfv return (error); 555209616Sjfv } 556209616Sjfv 557209616Sjfv return 0; 558209616Sjfv} 559209616Sjfv 560209616Sjfv/* 561209616Sjfv * ifp - must be IFT_LOOP 562209616Sjfv */ 563209616Sjfvstatic int 564209616Sjfvin6_ifattach_loopback(struct ifnet *ifp) 565209616Sjfv{ 566209616Sjfv struct in6_aliasreq ifra; 567209616Sjfv int error; 568209616Sjfv 569209616Sjfv bzero(&ifra, sizeof(ifra)); 570209616Sjfv 571209616Sjfv /* 572209616Sjfv * in6_update_ifa() does not use ifra_name, but we accurately set it 573209616Sjfv * for safety. 574209616Sjfv */ 575209616Sjfv strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 576209616Sjfv 577209616Sjfv ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 578209616Sjfv ifra.ifra_prefixmask.sin6_family = AF_INET6; 579209616Sjfv ifra.ifra_prefixmask.sin6_addr = in6mask128; 580209616Sjfv 581209616Sjfv /* 582209616Sjfv * Always initialize ia_dstaddr (= broadcast address) to loopback 583209616Sjfv * address. Follows IPv4 practice - see in_ifinit(). 584209616Sjfv */ 585209616Sjfv ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 586209616Sjfv ifra.ifra_dstaddr.sin6_family = AF_INET6; 587209616Sjfv ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 588209616Sjfv 589209616Sjfv ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 590209616Sjfv ifra.ifra_addr.sin6_family = AF_INET6; 591209616Sjfv ifra.ifra_addr.sin6_addr = in6addr_loopback; 592209616Sjfv 593209616Sjfv /* the loopback address should NEVER expire. */ 594209616Sjfv ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 595209616Sjfv ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 596209616Sjfv 597209616Sjfv /* we don't need to perform DAD on loopback interfaces. */ 598209616Sjfv ifra.ifra_flags |= IN6_IFF_NODAD; 599209616Sjfv 600209616Sjfv /* skip registration to the prefix list. XXX should be temporary. */ 601209616Sjfv ifra.ifra_flags |= IN6_IFF_NOPFX; 602209616Sjfv 603209616Sjfv /* 604209616Sjfv * We are sure that this is a newly assigned address, so we can set 605209616Sjfv * NULL to the 3rd arg. 606209616Sjfv */ 607209616Sjfv if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 608209616Sjfv nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 609209616Sjfv "the loopback address on %s (errno=%d)\n", 610209616Sjfv if_name(ifp), error)); 611209616Sjfv return (-1); 612209616Sjfv } 613209616Sjfv 614209616Sjfv return 0; 615209616Sjfv} 616209616Sjfv 617209616Sjfv/* 618209616Sjfv * compute NI group address, based on the current hostname setting. 619209616Sjfv * see RFC 4620. 620209616Sjfv * 621209616Sjfv * when ifp == NULL, the caller is responsible for filling scopeid. 622209616Sjfv * 623209616Sjfv * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 624209616Sjfv * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 625209616Sjfv */ 626209616Sjfvstatic int 627209616Sjfvin6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 628209616Sjfv struct in6_addr *in6, int oldmcprefix) 629209616Sjfv{ 630209616Sjfv struct prison *pr; 631209616Sjfv const char *p; 632209616Sjfv u_char *q; 633209616Sjfv MD5_CTX ctxt; 634209616Sjfv u_int8_t digest[16]; 635209616Sjfv char l; 636209616Sjfv char n[64]; /* a single label must not exceed 63 chars */ 637209616Sjfv 638209616Sjfv /* 639209616Sjfv * If no name is given and namelen is -1, 640209616Sjfv * we try to do the hostname lookup ourselves. 641209616Sjfv */ 642209616Sjfv if (!name && namelen == -1) { 643209616Sjfv pr = curthread->td_ucred->cr_prison; 644209616Sjfv mtx_lock(&pr->pr_mtx); 645209616Sjfv name = pr->pr_hostname; 646209616Sjfv namelen = strlen(name); 647209616Sjfv } else 648296055Serj pr = NULL; 649209616Sjfv if (!name || !namelen) { 650209616Sjfv if (pr != NULL) 651209616Sjfv mtx_unlock(&pr->pr_mtx); 652296055Serj return -1; 653296055Serj } 654296055Serj 655296055Serj p = name; 656209616Sjfv while (p && *p && *p != '.' && p - name < namelen) 657296055Serj p++; 658296055Serj if (p == name || p - name > sizeof(n) - 1) { 659296055Serj if (pr != NULL) 660296055Serj mtx_unlock(&pr->pr_mtx); 661296055Serj return -1; /* label too long */ 662296055Serj } 663296055Serj l = p - name; 664296055Serj strncpy(n, name, l); 665209616Sjfv if (pr != NULL) 666209616Sjfv mtx_unlock(&pr->pr_mtx); 667296055Serj n[(int)l] = '\0'; 668209616Sjfv for (q = n; *q; q++) { 669209616Sjfv if ('A' <= *q && *q <= 'Z') 670209616Sjfv *q = *q - 'A' + 'a'; 671209616Sjfv } 672209616Sjfv 673209616Sjfv /* generate 16 bytes of pseudo-random value. */ 674209616Sjfv bzero(&ctxt, sizeof(ctxt)); 675209616Sjfv MD5Init(&ctxt); 676209616Sjfv MD5Update(&ctxt, &l, sizeof(l)); 677209616Sjfv MD5Update(&ctxt, n, l); 678209616Sjfv MD5Final(digest, &ctxt); 679209616Sjfv 680269196Sjfv bzero(in6, sizeof(*in6)); 681209616Sjfv in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 682209616Sjfv in6->s6_addr8[11] = 2; 683209616Sjfv if (oldmcprefix == 0) { 684209616Sjfv in6->s6_addr8[12] = 0xff; 685209616Sjfv /* Copy the first 24 bits of 128-bit hash into the address. */ 686209616Sjfv bcopy(digest, &in6->s6_addr8[13], 3); 687209616Sjfv } else { 688209616Sjfv /* Copy the first 32 bits of 128-bit hash into the address. */ 689209616Sjfv bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 690209616Sjfv } 691209616Sjfv if (in6_setscope(in6, ifp, NULL)) 692209616Sjfv return (-1); /* XXX: should not fail */ 693209616Sjfv 694209616Sjfv return 0; 695209616Sjfv} 696209616Sjfv 697209616Sjfvint 698209616Sjfvin6_nigroup(struct ifnet *ifp, const char *name, int namelen, 699209616Sjfv struct in6_addr *in6) 700209616Sjfv{ 701209616Sjfv 702209616Sjfv return (in6_nigroup0(ifp, name, namelen, in6, 0)); 703209616Sjfv} 704209616Sjfv 705209616Sjfvint 706209616Sjfvin6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 707209616Sjfv struct in6_addr *in6) 708209616Sjfv{ 709209616Sjfv 710209616Sjfv return (in6_nigroup0(ifp, name, namelen, in6, 1)); 711209616Sjfv} 712209616Sjfv 713209616Sjfv/* 714209616Sjfv * XXX multiple loopback interface needs more care. for instance, 715209616Sjfv * nodelocal address needs to be configured onto only one of them. 716209616Sjfv * XXX multiple link-local address case 717209616Sjfv * 718209616Sjfv * altifp - secondary EUI64 source 719209616Sjfv */ 720209616Sjfvvoid 721209616Sjfvin6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 722209616Sjfv{ 723269196Sjfv struct in6_ifaddr *ia; 724209616Sjfv struct in6_addr in6; 725209616Sjfv 726209616Sjfv /* some of the interfaces are inherently not IPv6 capable */ 727209616Sjfv switch (ifp->if_type) { 728209616Sjfv case IFT_PFLOG: 729209616Sjfv case IFT_PFSYNC: 730209616Sjfv case IFT_CARP: 731209616Sjfv return; 732209616Sjfv } 733209616Sjfv 734209616Sjfv /* 735209616Sjfv * quirks based on interface type 736209616Sjfv */ 737209616Sjfv switch (ifp->if_type) { 738209616Sjfv#ifdef IFT_STF 739209616Sjfv case IFT_STF: 740209616Sjfv /* 741209616Sjfv * 6to4 interface is a very special kind of beast. 742209616Sjfv * no multicast, no linklocal. RFC2529 specifies how to make 743209616Sjfv * linklocals for 6to4 interface, but there's no use and 744209616Sjfv * it is rather harmful to have one. 745209616Sjfv */ 746209616Sjfv goto statinit; 747209616Sjfv#endif 748209616Sjfv default: 749209616Sjfv break; 750209616Sjfv } 751209616Sjfv 752209616Sjfv /* 753209616Sjfv * usually, we require multicast capability to the interface 754209616Sjfv */ 755209616Sjfv if ((ifp->if_flags & IFF_MULTICAST) == 0) { 756209616Sjfv nd6log((LOG_INFO, "in6_ifattach: " 757209616Sjfv "%s is not multicast capable, IPv6 not enabled\n", 758209616Sjfv if_name(ifp))); 759218530Sjfv return; 760218530Sjfv } 761218530Sjfv 762269196Sjfv /* 763209616Sjfv * assign loopback address for loopback interface. 764209616Sjfv * XXX multiple loopback interface case. 765209616Sjfv */ 766209616Sjfv if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 767209616Sjfv struct ifaddr *ifa; 768209616Sjfv 769209616Sjfv in6 = in6addr_loopback; 770209616Sjfv ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 771209616Sjfv if (ifa == NULL) { 772209616Sjfv if (in6_ifattach_loopback(ifp) != 0) 773209616Sjfv return; 774209616Sjfv } else 775209616Sjfv ifa_free(ifa); 776209616Sjfv } 777209616Sjfv 778209616Sjfv /* 779209616Sjfv * assign a link-local address, if there's none. 780209616Sjfv */ 781218530Sjfv if (ifp->if_type != IFT_BRIDGE && 782218530Sjfv !(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 783209616Sjfv ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 784209616Sjfv int error; 785209616Sjfv 786 ia = in6ifa_ifpforlinklocal(ifp, 0); 787 if (ia == NULL) { 788 error = in6_ifattach_linklocal(ifp, altifp); 789#if 0 790 if (error) 791 log(LOG_NOTICE, "in6_ifattach_linklocal: " 792 "failed to add a link-local addr to %s\n", 793 if_name(ifp)); 794#endif 795 } else 796 ifa_free(&ia->ia_ifa); 797 } 798 799#ifdef IFT_STF /* XXX */ 800statinit: 801#endif 802 803 /* update dynamically. */ 804 if (V_in6_maxmtu < ifp->if_mtu) 805 V_in6_maxmtu = ifp->if_mtu; 806} 807 808/* 809 * NOTE: in6_ifdetach() does not support loopback if at this moment. 810 * We don't need this function in bsdi, because interfaces are never removed 811 * from the ifnet list in bsdi. 812 */ 813void 814in6_ifdetach(struct ifnet *ifp) 815{ 816 struct in6_ifaddr *ia; 817 struct ifaddr *ifa, *next; 818 struct radix_node_head *rnh; 819 struct rtentry *rt; 820 struct sockaddr_in6 sin6; 821 struct in6_multi_mship *imm; 822 823 /* remove neighbor management table */ 824 nd6_purge(ifp); 825 826 /* nuke any of IPv6 addresses we have */ 827 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 828 if (ifa->ifa_addr->sa_family != AF_INET6) 829 continue; 830 in6_purgeaddr(ifa); 831 } 832 833 /* undo everything done by in6_ifattach(), just in case */ 834 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 835 if (ifa->ifa_addr->sa_family != AF_INET6 836 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 837 continue; 838 } 839 840 ia = (struct in6_ifaddr *)ifa; 841 842 /* 843 * leave from multicast groups we have joined for the interface 844 */ 845 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 846 LIST_REMOVE(imm, i6mm_chain); 847 in6_leavegroup(imm); 848 } 849 850 /* Remove link-local from the routing table. */ 851 if (ia->ia_flags & IFA_ROUTE) 852 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags); 853 854 /* remove from the linked list */ 855 IF_ADDR_WLOCK(ifp); 856 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 857 IF_ADDR_WUNLOCK(ifp); 858 ifa_free(ifa); /* if_addrhead */ 859 860 IN6_IFADDR_WLOCK(); 861 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 862 IN6_IFADDR_WUNLOCK(); 863 ifa_free(ifa); 864 } 865 866 in6_pcbpurgeif0(&V_udbinfo, ifp); 867 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 868 /* leave from all multicast groups joined */ 869 in6_purgemaddrs(ifp); 870 871 /* 872 * remove neighbor management table. we call it twice just to make 873 * sure we nuke everything. maybe we need just one call. 874 * XXX: since the first call did not release addresses, some prefixes 875 * might remain. We should call nd6_purge() again to release the 876 * prefixes after removing all addresses above. 877 * (Or can we just delay calling nd6_purge until at this point?) 878 */ 879 nd6_purge(ifp); 880 881 /* 882 * Remove route to link-local allnodes multicast (ff02::1). 883 * These only get automatically installed for the default FIB. 884 */ 885 bzero(&sin6, sizeof(sin6)); 886 sin6.sin6_len = sizeof(struct sockaddr_in6); 887 sin6.sin6_family = AF_INET6; 888 sin6.sin6_addr = in6addr_linklocal_allnodes; 889 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 890 /* XXX: should not fail */ 891 return; 892 /* XXX grab lock first to avoid LOR */ 893 rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6); 894 if (rnh != NULL) { 895 RADIX_NODE_HEAD_LOCK(rnh); 896 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED, 897 RT_DEFAULT_FIB); 898 if (rt) { 899 if (rt->rt_ifp == ifp) 900 rtexpunge(rt); 901 RTFREE_LOCKED(rt); 902 } 903 RADIX_NODE_HEAD_UNLOCK(rnh); 904 } 905} 906 907int 908in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 909 const u_int8_t *baseid, int generate) 910{ 911 u_int8_t nullbuf[8]; 912 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 913 914 bzero(nullbuf, sizeof(nullbuf)); 915 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 916 /* we've never created a random ID. Create a new one. */ 917 generate = 1; 918 } 919 920 if (generate) { 921 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 922 923 /* generate_tmp_ifid will update seedn and buf */ 924 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 925 ndi->randomid); 926 } 927 bcopy(ndi->randomid, retbuf, 8); 928 929 return (0); 930} 931 932void 933in6_tmpaddrtimer(void *arg) 934{ 935 CURVNET_SET((struct vnet *) arg); 936 struct nd_ifinfo *ndi; 937 u_int8_t nullbuf[8]; 938 struct ifnet *ifp; 939 940 callout_reset(&V_in6_tmpaddrtimer_ch, 941 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 942 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 943 944 bzero(nullbuf, sizeof(nullbuf)); 945 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 946 ndi = ND_IFINFO(ifp); 947 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 948 /* 949 * We've been generating a random ID on this interface. 950 * Create a new one. 951 */ 952 (void)generate_tmp_ifid(ndi->randomseed0, 953 ndi->randomseed1, ndi->randomid); 954 } 955 } 956 957 CURVNET_RESTORE(); 958} 959 960static void 961in6_purgemaddrs(struct ifnet *ifp) 962{ 963 LIST_HEAD(,in6_multi) purgeinms; 964 struct in6_multi *inm, *tinm; 965 struct ifmultiaddr *ifma; 966 967 LIST_INIT(&purgeinms); 968 IN6_MULTI_LOCK(); 969 970 /* 971 * Extract list of in6_multi associated with the detaching ifp 972 * which the PF_INET6 layer is about to release. 973 * We need to do this as IF_ADDR_LOCK() may be re-acquired 974 * by code further down. 975 */ 976 IF_ADDR_RLOCK(ifp); 977 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 978 if (ifma->ifma_addr->sa_family != AF_INET6 || 979 ifma->ifma_protospec == NULL) 980 continue; 981 inm = (struct in6_multi *)ifma->ifma_protospec; 982 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 983 } 984 IF_ADDR_RUNLOCK(ifp); 985 986 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 987 LIST_REMOVE(inm, in6m_entry); 988 in6m_release_locked(inm); 989 } 990 mld_ifdetach(ifp); 991 992 IN6_MULTI_UNLOCK(); 993} 994