in6_ifattach.c revision 197138
1139826Simp/*- 253541Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 353541Sshin * All rights reserved. 453541Sshin * 553541Sshin * Redistribution and use in source and binary forms, with or without 653541Sshin * modification, are permitted provided that the following conditions 753541Sshin * are met: 853541Sshin * 1. Redistributions of source code must retain the above copyright 953541Sshin * notice, this list of conditions and the following disclaimer. 1053541Sshin * 2. Redistributions in binary form must reproduce the above copyright 1153541Sshin * notice, this list of conditions and the following disclaimer in the 1253541Sshin * documentation and/or other materials provided with the distribution. 1353541Sshin * 3. Neither the name of the project nor the names of its contributors 1453541Sshin * may be used to endorse or promote products derived from this software 1553541Sshin * without specific prior written permission. 1653541Sshin * 1753541Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1853541Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1953541Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2053541Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2153541Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2253541Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2353541Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2453541Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2553541Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2653541Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2753541Sshin * SUCH DAMAGE. 28174510Sobrien * 29174510Sobrien * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 3053541Sshin */ 3153541Sshin 32174510Sobrien#include <sys/cdefs.h> 33174510Sobrien__FBSDID("$FreeBSD: head/sys/netinet6/in6_ifattach.c 197138 2009-09-12 22:08:20Z hrs $"); 34174510Sobrien 3553541Sshin#include <sys/param.h> 3653541Sshin#include <sys/systm.h> 3753541Sshin#include <sys/malloc.h> 3853541Sshin#include <sys/socket.h> 3953541Sshin#include <sys/sockio.h> 40193066Sjamie#include <sys/jail.h> 4153541Sshin#include <sys/kernel.h> 42196019Srwatson#include <sys/proc.h> 4378064Sume#include <sys/syslog.h> 4453541Sshin#include <sys/md5.h> 4553541Sshin 4653541Sshin#include <net/if.h> 4753541Sshin#include <net/if_dl.h> 4853541Sshin#include <net/if_types.h> 4953541Sshin#include <net/route.h> 50185571Sbz#include <net/vnet.h> 5153541Sshin 5253541Sshin#include <netinet/in.h> 5353541Sshin#include <netinet/in_var.h> 5453541Sshin#include <netinet/if_ether.h> 5581127Sume#include <netinet/in_pcb.h> 56195699Srwatson#include <netinet/ip_var.h> 57195699Srwatson#include <netinet/udp.h> 58195699Srwatson#include <netinet/udp_var.h> 5953541Sshin 6062587Sitojun#include <netinet/ip6.h> 6153541Sshin#include <netinet6/ip6_var.h> 6278064Sume#include <netinet6/in6_var.h> 6381127Sume#include <netinet6/in6_pcb.h> 6453541Sshin#include <netinet6/in6_ifattach.h> 6553541Sshin#include <netinet6/ip6_var.h> 6653541Sshin#include <netinet6/nd6.h> 67191672Sbms#include <netinet6/mld6_var.h> 6862587Sitojun#include <netinet6/scope6_var.h> 6953541Sshin 70195699SrwatsonVNET_DEFINE(unsigned long, in6_maxmtu); 71195699SrwatsonVNET_DEFINE(int, ip6_auto_linklocal); 72195699SrwatsonVNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 7381127Sume 74195727Srwatson#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 75195699Srwatson 76195699SrwatsonVNET_DECLARE(struct inpcbinfo, ripcbinfo); 77195727Srwatson#define V_ripcbinfo VNET(ripcbinfo) 78195699Srwatson 79175162Sobrienstatic int get_rand_ifid(struct ifnet *, struct in6_addr *); 80175162Sobrienstatic int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 81175162Sobrienstatic int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 82175162Sobrienstatic int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 83175162Sobrienstatic int in6_ifattach_loopback(struct ifnet *); 84175162Sobrienstatic void in6_purgemaddrs(struct ifnet *); 8553541Sshin 8662587Sitojun#define EUI64_GBIT 0x01 8762587Sitojun#define EUI64_UBIT 0x02 8862587Sitojun#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 8962587Sitojun#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 9062587Sitojun#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 9162587Sitojun#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 9262587Sitojun#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 9353541Sshin 9462587Sitojun#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 9562587Sitojun#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 9653541Sshin 9753541Sshin/* 9853541Sshin * Generate a last-resort interface identifier, when the machine has no 9953541Sshin * IEEE802/EUI64 address sources. 10062587Sitojun * The goal here is to get an interface identifier that is 10162587Sitojun * (1) random enough and (2) does not change across reboot. 10262587Sitojun * We currently use MD5(hostname) for it. 103171259Sdelphij * 104171259Sdelphij * in6 - upper 64bits are preserved 10553541Sshin */ 10653541Sshinstatic int 107171259Sdelphijget_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 10853541Sshin{ 10953541Sshin MD5_CTX ctxt; 110193066Sjamie struct prison *pr; 11153541Sshin u_int8_t digest[16]; 112180291Srwatson int hostnamelen; 11353541Sshin 114193066Sjamie pr = curthread->td_ucred->cr_prison; 115193066Sjamie mtx_lock(&pr->pr_mtx); 116194118Sjamie hostnamelen = strlen(pr->pr_hostname); 11762587Sitojun#if 0 11862587Sitojun /* we need at least several letters as seed for ifid */ 119193066Sjamie if (hostnamelen < 3) { 120193066Sjamie mtx_unlock(&pr->pr_mtx); 12162587Sitojun return -1; 122193066Sjamie } 12362587Sitojun#endif 12462587Sitojun 12562587Sitojun /* generate 8 bytes of pseudo-random value. */ 12653541Sshin bzero(&ctxt, sizeof(ctxt)); 12753541Sshin MD5Init(&ctxt); 128194118Sjamie MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 129193066Sjamie mtx_unlock(&pr->pr_mtx); 13053541Sshin MD5Final(digest, &ctxt); 13153541Sshin 13262587Sitojun /* assumes sizeof(digest) > sizeof(ifid) */ 13362587Sitojun bcopy(digest, &in6->s6_addr[8], 8); 13453541Sshin 13553541Sshin /* make sure to set "u" bit to local, and "g" bit to individual. */ 13662587Sitojun in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 13762587Sitojun in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 13853541Sshin 13962587Sitojun /* convert EUI64 into IPv6 interface identifier */ 14062587Sitojun EUI64_TO_IFID(in6); 14162587Sitojun 14253541Sshin return 0; 14353541Sshin} 14453541Sshin 14578064Sumestatic int 146171259Sdelphijgenerate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 14778064Sume{ 14878064Sume MD5_CTX ctxt; 14978064Sume u_int8_t seed[16], digest[16], nullbuf[8]; 15078064Sume u_int32_t val32; 15178064Sume 152171259Sdelphij /* If there's no history, start with a random seed. */ 15378064Sume bzero(nullbuf, sizeof(nullbuf)); 15478064Sume if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 15578064Sume int i; 15678064Sume 15778064Sume for (i = 0; i < 2; i++) { 158121807Sume val32 = arc4random(); 15978064Sume bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 16078064Sume } 161120913Sume } else 16278064Sume bcopy(seed0, seed, 8); 16378064Sume 16478064Sume /* copy the right-most 64-bits of the given address */ 16578064Sume /* XXX assumption on the size of IFID */ 16678064Sume bcopy(seed1, &seed[8], 8); 16778064Sume 16878064Sume if (0) { /* for debugging purposes only */ 16978064Sume int i; 17078064Sume 17178064Sume printf("generate_tmp_ifid: new randomized ID from: "); 17278064Sume for (i = 0; i < 16; i++) 17378064Sume printf("%02x", seed[i]); 17478064Sume printf(" "); 17578064Sume } 17678064Sume 17778064Sume /* generate 16 bytes of pseudo-random value. */ 17878064Sume bzero(&ctxt, sizeof(ctxt)); 17978064Sume MD5Init(&ctxt); 18078064Sume MD5Update(&ctxt, seed, sizeof(seed)); 18178064Sume MD5Final(digest, &ctxt); 18278064Sume 18378064Sume /* 18478064Sume * RFC 3041 3.2.1. (3) 18578064Sume * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 18678064Sume * left-most bit is numbered 0) to zero. 18778064Sume */ 18878064Sume bcopy(digest, ret, 8); 18978064Sume ret[0] &= ~EUI64_UBIT; 19078064Sume 19178064Sume /* 19278064Sume * XXX: we'd like to ensure that the generated value is not zero 19378064Sume * for simplicity. If the caclculated digest happens to be zero, 19478064Sume * use a random non-zero value as the last resort. 19578064Sume */ 19678064Sume if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 197151465Ssuz nd6log((LOG_INFO, 198151465Ssuz "generate_tmp_ifid: computed MD5 value is zero.\n")); 19978064Sume 200121807Sume val32 = arc4random(); 20178064Sume val32 = 1 + (val32 % (0xffffffff - 1)); 20278064Sume } 20378064Sume 20478064Sume /* 20578064Sume * RFC 3041 3.2.1. (4) 20678064Sume * Take the rightmost 64-bits of the MD5 digest and save them in 20778064Sume * stable storage as the history value to be used in the next 208120913Sume * iteration of the algorithm. 20978064Sume */ 21078064Sume bcopy(&digest[8], seed0, 8); 21178064Sume 21278064Sume if (0) { /* for debugging purposes only */ 21378064Sume int i; 21478064Sume 21578064Sume printf("to: "); 21678064Sume for (i = 0; i < 16; i++) 21778064Sume printf("%02x", digest[i]); 21878064Sume printf("\n"); 21978064Sume } 22078064Sume 22178064Sume return 0; 22278064Sume} 22378064Sume 22453541Sshin/* 22562587Sitojun * Get interface identifier for the specified interface. 22662587Sitojun * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 227171259Sdelphij * 228171259Sdelphij * in6 - upper 64bits are preserved 22953541Sshin */ 230151477Ssuzint 231171259Sdelphijin6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 23253541Sshin{ 23353541Sshin struct ifaddr *ifa; 23453541Sshin struct sockaddr_dl *sdl; 23562587Sitojun u_int8_t *addr; 23662587Sitojun size_t addrlen; 23762587Sitojun static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 23862587Sitojun static u_int8_t allone[8] = 23962587Sitojun { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 24053541Sshin 241191337Srwatson IF_ADDR_LOCK(ifp); 242191340Srwatson TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 24362587Sitojun if (ifa->ifa_addr->sa_family != AF_LINK) 24453541Sshin continue; 24562587Sitojun sdl = (struct sockaddr_dl *)ifa->ifa_addr; 24662587Sitojun if (sdl == NULL) 24762587Sitojun continue; 24862587Sitojun if (sdl->sdl_alen == 0) 24962587Sitojun continue; 25062587Sitojun 25162587Sitojun goto found; 25253541Sshin } 253191337Srwatson IF_ADDR_UNLOCK(ifp); 25453541Sshin 25562587Sitojun return -1; 25662587Sitojun 25753541Sshinfound: 258194760Srwatson IF_ADDR_LOCK_ASSERT(ifp); 25962587Sitojun addr = LLADDR(sdl); 26062587Sitojun addrlen = sdl->sdl_alen; 26153541Sshin 26262587Sitojun /* get EUI64 */ 26362587Sitojun switch (ifp->if_type) { 26462587Sitojun case IFT_ETHER: 26562587Sitojun case IFT_FDDI: 266120049Smdodd case IFT_ISO88025: 26762587Sitojun case IFT_ATM: 26878064Sume case IFT_IEEE1394: 26978064Sume#ifdef IFT_IEEE80211 27078064Sume case IFT_IEEE80211: 27178064Sume#endif 27262587Sitojun /* IEEE802/EUI64 cases - what others? */ 27378064Sume /* IEEE1394 uses 16byte length address starting with EUI64 */ 27478064Sume if (addrlen > 8) 27578064Sume addrlen = 8; 27653541Sshin 27762587Sitojun /* look at IEEE802/EUI64 only */ 278191337Srwatson if (addrlen != 8 && addrlen != 6) { 279191337Srwatson IF_ADDR_UNLOCK(ifp); 28062587Sitojun return -1; 281191337Srwatson } 28253541Sshin 28362587Sitojun /* 28462587Sitojun * check for invalid MAC address - on bsdi, we see it a lot 28562587Sitojun * since wildboar configures all-zero MAC on pccard before 28662587Sitojun * card insertion. 28762587Sitojun */ 288191337Srwatson if (bcmp(addr, allzero, addrlen) == 0) { 289191337Srwatson IF_ADDR_UNLOCK(ifp); 29062587Sitojun return -1; 291191337Srwatson } 292191337Srwatson if (bcmp(addr, allone, addrlen) == 0) { 293191337Srwatson IF_ADDR_UNLOCK(ifp); 29462587Sitojun return -1; 295191337Srwatson } 29662587Sitojun 29762587Sitojun /* make EUI64 address */ 29862587Sitojun if (addrlen == 8) 29962587Sitojun bcopy(addr, &in6->s6_addr[8], 8); 30062587Sitojun else if (addrlen == 6) { 30162587Sitojun in6->s6_addr[8] = addr[0]; 30262587Sitojun in6->s6_addr[9] = addr[1]; 30362587Sitojun in6->s6_addr[10] = addr[2]; 30462587Sitojun in6->s6_addr[11] = 0xff; 30562587Sitojun in6->s6_addr[12] = 0xfe; 30662587Sitojun in6->s6_addr[13] = addr[3]; 30762587Sitojun in6->s6_addr[14] = addr[4]; 30862587Sitojun in6->s6_addr[15] = addr[5]; 30962587Sitojun } 31062587Sitojun break; 31162587Sitojun 31262587Sitojun case IFT_ARCNET: 313191337Srwatson if (addrlen != 1) { 314191337Srwatson IF_ADDR_UNLOCK(ifp); 31562587Sitojun return -1; 316191337Srwatson } 317191337Srwatson if (!addr[0]) { 318191337Srwatson IF_ADDR_UNLOCK(ifp); 31962587Sitojun return -1; 320191337Srwatson } 32162587Sitojun 32262587Sitojun bzero(&in6->s6_addr[8], 8); 32362587Sitojun in6->s6_addr[15] = addr[0]; 32462587Sitojun 32562587Sitojun /* 32662587Sitojun * due to insufficient bitwidth, we mark it local. 32762587Sitojun */ 32862587Sitojun in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 32962587Sitojun in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 33062587Sitojun break; 33162587Sitojun 33262587Sitojun case IFT_GIF: 33362587Sitojun#ifdef IFT_STF 33462587Sitojun case IFT_STF: 33553541Sshin#endif 33662587Sitojun /* 33778064Sume * RFC2893 says: "SHOULD use IPv4 address as ifid source". 33862587Sitojun * however, IPv4 address is not very suitable as unique 33962587Sitojun * identifier source (can be renumbered). 34062587Sitojun * we don't do this. 34162587Sitojun */ 342191337Srwatson IF_ADDR_UNLOCK(ifp); 34362587Sitojun return -1; 34462587Sitojun 34562587Sitojun default: 346191337Srwatson IF_ADDR_UNLOCK(ifp); 34762587Sitojun return -1; 34853541Sshin } 34962587Sitojun 35062587Sitojun /* sanity check: g bit must not indicate "group" */ 351191337Srwatson if (EUI64_GROUP(in6)) { 352191337Srwatson IF_ADDR_UNLOCK(ifp); 35362587Sitojun return -1; 354191337Srwatson } 35562587Sitojun 35662587Sitojun /* convert EUI64 into IPv6 interface identifier */ 35762587Sitojun EUI64_TO_IFID(in6); 35862587Sitojun 35962587Sitojun /* 36062587Sitojun * sanity check: ifid must not be all zero, avoid conflict with 36162587Sitojun * subnet router anycast 36262587Sitojun */ 36362587Sitojun if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 36462587Sitojun bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 365191337Srwatson IF_ADDR_UNLOCK(ifp); 36662587Sitojun return -1; 36762587Sitojun } 36862587Sitojun 369191337Srwatson IF_ADDR_UNLOCK(ifp); 37062587Sitojun return 0; 37153541Sshin} 37253541Sshin 37353541Sshin/* 37462587Sitojun * Get interface identifier for the specified interface. If it is not 37562587Sitojun * available on ifp0, borrow interface identifier from other information 37662587Sitojun * sources. 377171259Sdelphij * 378171259Sdelphij * altifp - secondary EUI64 source 37953541Sshin */ 38062587Sitojunstatic int 381171259Sdelphijget_ifid(struct ifnet *ifp0, struct ifnet *altifp, 382171259Sdelphij struct in6_addr *in6) 38353541Sshin{ 38453541Sshin struct ifnet *ifp; 38553541Sshin 38662587Sitojun /* first, try to get it from the interface itself */ 387151477Ssuz if (in6_get_hw_ifid(ifp0, in6) == 0) { 38878064Sume nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 38978064Sume if_name(ifp0))); 39062587Sitojun goto success; 39162587Sitojun } 39253541Sshin 39362587Sitojun /* try secondary EUI64 source. this basically is for ATM PVC */ 394151477Ssuz if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 39578064Sume nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 39678064Sume if_name(ifp0), if_name(altifp))); 39762587Sitojun goto success; 39862587Sitojun } 39962587Sitojun 40062587Sitojun /* next, try to get it from some other hardware interface */ 401196481Srwatson IFNET_RLOCK_NOSLEEP(); 402181803Sbz for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 40362587Sitojun if (ifp == ifp0) 40462587Sitojun continue; 405151477Ssuz if (in6_get_hw_ifid(ifp, in6) != 0) 40662587Sitojun continue; 40762587Sitojun 40862587Sitojun /* 40962587Sitojun * to borrow ifid from other interface, ifid needs to be 41062587Sitojun * globally unique 41162587Sitojun */ 41262587Sitojun if (IFID_UNIVERSAL(in6)) { 41378064Sume nd6log((LOG_DEBUG, 41478064Sume "%s: borrow interface identifier from %s\n", 41578064Sume if_name(ifp0), if_name(ifp))); 416196481Srwatson IFNET_RUNLOCK_NOSLEEP(); 41762587Sitojun goto success; 41862587Sitojun } 41962587Sitojun } 420196481Srwatson IFNET_RUNLOCK_NOSLEEP(); 42162587Sitojun 42262587Sitojun /* last resort: get from random number source */ 42362587Sitojun if (get_rand_ifid(ifp, in6) == 0) { 42478064Sume nd6log((LOG_DEBUG, 42578064Sume "%s: interface identifier generated by random number\n", 42678064Sume if_name(ifp0))); 42762587Sitojun goto success; 42862587Sitojun } 42962587Sitojun 43066504Sitojun printf("%s: failed to get interface identifier\n", if_name(ifp0)); 43162587Sitojun return -1; 43262587Sitojun 43362587Sitojunsuccess: 434120913Sume nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 435120913Sume if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 436120913Sume in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 437120913Sume in6->s6_addr[14], in6->s6_addr[15])); 43862587Sitojun return 0; 43962587Sitojun} 44062587Sitojun 441171259Sdelphij/* 442171259Sdelphij * altifp - secondary EUI64 source 443171259Sdelphij */ 44462587Sitojunstatic int 445171259Sdelphijin6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 44678064Sume{ 44762587Sitojun struct in6_ifaddr *ia; 44878064Sume struct in6_aliasreq ifra; 449151539Ssuz struct nd_prefixctl pr0; 45078064Sume int i, error; 45162587Sitojun 45262587Sitojun /* 45378064Sume * configure link-local address. 45462587Sitojun */ 45578064Sume bzero(&ifra, sizeof(ifra)); 45662587Sitojun 45762587Sitojun /* 45878064Sume * in6_update_ifa() does not use ifra_name, but we accurately set it 45978064Sume * for safety. 46062587Sitojun */ 46178064Sume strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 46262587Sitojun 46378064Sume ifra.ifra_addr.sin6_family = AF_INET6; 46478064Sume ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 465148385Sume ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 46678064Sume ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 46778064Sume if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 46878064Sume ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 46978064Sume ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 47078064Sume } else { 47178064Sume if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 47278064Sume nd6log((LOG_ERR, 47378064Sume "%s: no ifid available\n", if_name(ifp))); 474120913Sume return (-1); 47562587Sitojun } 47662587Sitojun } 477148385Sume if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 478148385Sume return (-1); 47962587Sitojun 48078064Sume ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 48178064Sume ifra.ifra_prefixmask.sin6_family = AF_INET6; 48278064Sume ifra.ifra_prefixmask.sin6_addr = in6mask64; 48378064Sume /* link-local addresses should NEVER expire. */ 48478064Sume ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 48578064Sume ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 48662587Sitojun 48778064Sume /* 48878064Sume * Now call in6_update_ifa() to do a bunch of procedures to configure 489151465Ssuz * a link-local address. We can set the 3rd argument to NULL, because 49095023Ssuz * we know there's no other link-local address on the interface 49195023Ssuz * and therefore we are adding one (instead of updating one). 49278064Sume */ 493151539Ssuz if ((error = in6_update_ifa(ifp, &ifra, NULL, 494151539Ssuz IN6_IFAUPDATE_DADDELAY)) != 0) { 49562587Sitojun /* 49678064Sume * XXX: When the interface does not support IPv6, this call 49778064Sume * would fail in the SIOCSIFADDR ioctl. I believe the 49878064Sume * notification is rather confusing in this case, so just 499120913Sume * suppress it. (jinmei@kame.net 20010130) 50062587Sitojun */ 50178064Sume if (error != EAFNOSUPPORT) 502151465Ssuz nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 50378064Sume "configure a link-local address on %s " 50478064Sume "(errno=%d)\n", 505151465Ssuz if_name(ifp), error)); 506120856Sume return (-1); 50762587Sitojun } 50862587Sitojun 50978064Sume ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 51078064Sume#ifdef DIAGNOSTIC 51178064Sume if (!ia) { 51278064Sume panic("ia == NULL in in6_ifattach_linklocal"); 51395023Ssuz /* NOTREACHED */ 51478064Sume } 51562587Sitojun#endif 516194760Srwatson ifa_free(&ia->ia_ifa); 51753541Sshin 51878064Sume /* 519120913Sume * Make the link-local prefix (fe80::%link/64) as on-link. 52078064Sume * Since we'd like to manage prefixes separately from addresses, 52178064Sume * we make an ND6 prefix structure for the link-local prefix, 52278064Sume * and add it to the prefix list as a never-expire prefix. 52378064Sume * XXX: this change might affect some existing code base... 52478064Sume */ 52578064Sume bzero(&pr0, sizeof(pr0)); 52678064Sume pr0.ndpr_ifp = ifp; 52778064Sume /* this should be 64 at this moment. */ 52878064Sume pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 52978064Sume pr0.ndpr_prefix = ifra.ifra_addr; 53078064Sume /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 53178064Sume for (i = 0; i < 4; i++) { 53278064Sume pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 533120913Sume in6mask64.s6_addr32[i]; 53462587Sitojun } 53578064Sume /* 53678064Sume * Initialize parameters. The link-local prefix must always be 53778064Sume * on-link, and its lifetimes never expire. 53878064Sume */ 53978064Sume pr0.ndpr_raf_onlink = 1; 54078064Sume pr0.ndpr_raf_auto = 1; /* probably meaningless */ 54178064Sume pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 54278064Sume pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 54378064Sume /* 54478064Sume * Since there is no other link-local addresses, nd6_prefix_lookup() 54578064Sume * probably returns NULL. However, we cannot always expect the result. 54678064Sume * For example, if we first remove the (only) existing link-local 54778064Sume * address, and then reconfigure another one, the prefix is still 54878064Sume * valid with referring to the old link-local address. 54978064Sume */ 55078064Sume if (nd6_prefix_lookup(&pr0) == NULL) { 55178064Sume if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 552120856Sume return (error); 55378064Sume } 55462587Sitojun 55562587Sitojun return 0; 55662587Sitojun} 55762587Sitojun 558171259Sdelphij/* 559171259Sdelphij * ifp - must be IFT_LOOP 560171259Sdelphij */ 56162587Sitojunstatic int 562171259Sdelphijin6_ifattach_loopback(struct ifnet *ifp) 56362587Sitojun{ 56478064Sume struct in6_aliasreq ifra; 56578064Sume int error; 56662587Sitojun 56778064Sume bzero(&ifra, sizeof(ifra)); 56878064Sume 56962587Sitojun /* 57078064Sume * in6_update_ifa() does not use ifra_name, but we accurately set it 57178064Sume * for safety. 57262587Sitojun */ 57378064Sume strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 57462587Sitojun 57578064Sume ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 57678064Sume ifra.ifra_prefixmask.sin6_family = AF_INET6; 57778064Sume ifra.ifra_prefixmask.sin6_addr = in6mask128; 57862587Sitojun 57962587Sitojun /* 58062587Sitojun * Always initialize ia_dstaddr (= broadcast address) to loopback 58178064Sume * address. Follows IPv4 practice - see in_ifinit(). 58262587Sitojun */ 58378064Sume ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 58478064Sume ifra.ifra_dstaddr.sin6_family = AF_INET6; 58578064Sume ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 58662587Sitojun 58778064Sume ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 58878064Sume ifra.ifra_addr.sin6_family = AF_INET6; 58978064Sume ifra.ifra_addr.sin6_addr = in6addr_loopback; 59062587Sitojun 59178064Sume /* the loopback address should NEVER expire. */ 59278064Sume ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 59378064Sume ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 59462587Sitojun 59595023Ssuz /* we don't need to perform DAD on loopback interfaces. */ 59678064Sume ifra.ifra_flags |= IN6_IFF_NODAD; 59778064Sume 59878064Sume /* skip registration to the prefix list. XXX should be temporary. */ 59978064Sume ifra.ifra_flags |= IN6_IFF_NOPFX; 60078064Sume 60178064Sume /* 60295023Ssuz * We are sure that this is a newly assigned address, so we can set 60395023Ssuz * NULL to the 3rd arg. 60478064Sume */ 605151539Ssuz if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 606151465Ssuz nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 60778064Sume "the loopback address on %s (errno=%d)\n", 608151465Ssuz if_name(ifp), error)); 609120856Sume return (-1); 61062587Sitojun } 61162587Sitojun 61262587Sitojun return 0; 61362587Sitojun} 61462587Sitojun 61562587Sitojun/* 61662587Sitojun * compute NI group address, based on the current hostname setting. 61762587Sitojun * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 61862587Sitojun * 61962587Sitojun * when ifp == NULL, the caller is responsible for filling scopeid. 62062587Sitojun */ 62178064Sumeint 622171259Sdelphijin6_nigroup(struct ifnet *ifp, const char *name, int namelen, 623171259Sdelphij struct in6_addr *in6) 62462587Sitojun{ 625193066Sjamie struct prison *pr; 62662587Sitojun const char *p; 62778064Sume u_char *q; 62862587Sitojun MD5_CTX ctxt; 62962587Sitojun u_int8_t digest[16]; 63062587Sitojun char l; 63178064Sume char n[64]; /* a single label must not exceed 63 chars */ 63262587Sitojun 633192895Sjamie /* 634192895Sjamie * If no name is given and namelen is -1, 635192895Sjamie * we try to do the hostname lookup ourselves. 636192895Sjamie */ 637192895Sjamie if (!name && namelen == -1) { 638193066Sjamie pr = curthread->td_ucred->cr_prison; 639193066Sjamie mtx_lock(&pr->pr_mtx); 640194118Sjamie name = pr->pr_hostname; 641192895Sjamie namelen = strlen(name); 642192895Sjamie } else 643193066Sjamie pr = NULL; 644192895Sjamie if (!name || !namelen) { 645193066Sjamie if (pr != NULL) 646193066Sjamie mtx_unlock(&pr->pr_mtx); 64762587Sitojun return -1; 648192895Sjamie } 64962587Sitojun 65062587Sitojun p = name; 65162587Sitojun while (p && *p && *p != '.' && p - name < namelen) 65262587Sitojun p++; 653192895Sjamie if (p == name || p - name > sizeof(n) - 1) { 654193066Sjamie if (pr != NULL) 655193066Sjamie mtx_unlock(&pr->pr_mtx); 65695023Ssuz return -1; /* label too long */ 657192895Sjamie } 65862587Sitojun l = p - name; 65978064Sume strncpy(n, name, l); 660193066Sjamie if (pr != NULL) 661193066Sjamie mtx_unlock(&pr->pr_mtx); 66278064Sume n[(int)l] = '\0'; 66378064Sume for (q = n; *q; q++) { 66478064Sume if ('A' <= *q && *q <= 'Z') 66578064Sume *q = *q - 'A' + 'a'; 66678064Sume } 66762587Sitojun 66862587Sitojun /* generate 8 bytes of pseudo-random value. */ 66962587Sitojun bzero(&ctxt, sizeof(ctxt)); 67062587Sitojun MD5Init(&ctxt); 67162587Sitojun MD5Update(&ctxt, &l, sizeof(l)); 67278064Sume MD5Update(&ctxt, n, l); 67362587Sitojun MD5Final(digest, &ctxt); 67462587Sitojun 67562587Sitojun bzero(in6, sizeof(*in6)); 676151465Ssuz in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 67762587Sitojun in6->s6_addr8[11] = 2; 67862587Sitojun bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 679148385Sume if (in6_setscope(in6, ifp, NULL)) 680148385Sume return (-1); /* XXX: should not fail */ 68162587Sitojun 68262587Sitojun return 0; 68362587Sitojun} 68462587Sitojun 68562587Sitojun/* 68662587Sitojun * XXX multiple loopback interface needs more care. for instance, 68762587Sitojun * nodelocal address needs to be configured onto only one of them. 68862587Sitojun * XXX multiple link-local address case 689171259Sdelphij * 690171259Sdelphij * altifp - secondary EUI64 source 69162587Sitojun */ 69262587Sitojunvoid 693171259Sdelphijin6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 69462587Sitojun{ 69562587Sitojun struct in6_ifaddr *ia; 69662587Sitojun struct in6_addr in6; 69762587Sitojun 69878064Sume /* some of the interfaces are inherently not IPv6 capable */ 69978064Sume switch (ifp->if_type) { 700126263Smlaier case IFT_PFLOG: 701126263Smlaier case IFT_PFSYNC: 702142215Sglebius case IFT_CARP: 70378064Sume return; 70478064Sume } 70578064Sume 70653541Sshin /* 70762587Sitojun * quirks based on interface type 70853541Sshin */ 70962587Sitojun switch (ifp->if_type) { 71062587Sitojun#ifdef IFT_STF 71162587Sitojun case IFT_STF: 71262587Sitojun /* 71395023Ssuz * 6to4 interface is a very special kind of beast. 71495023Ssuz * no multicast, no linklocal. RFC2529 specifies how to make 71595023Ssuz * linklocals for 6to4 interface, but there's no use and 71695023Ssuz * it is rather harmful to have one. 71762587Sitojun */ 71862587Sitojun goto statinit; 71962587Sitojun#endif 72062587Sitojun default: 72162587Sitojun break; 72253541Sshin } 72353541Sshin 72453541Sshin /* 72562587Sitojun * usually, we require multicast capability to the interface 72653541Sshin */ 72762587Sitojun if ((ifp->if_flags & IFF_MULTICAST) == 0) { 728151465Ssuz nd6log((LOG_INFO, "in6_ifattach: " 72978064Sume "%s is not multicast capable, IPv6 not enabled\n", 730151465Ssuz if_name(ifp))); 73162587Sitojun return; 73262587Sitojun } 73362587Sitojun 73453541Sshin /* 73578064Sume * assign loopback address for loopback interface. 73678064Sume * XXX multiple loopback interface case. 73753541Sshin */ 73878064Sume if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 739194760Srwatson struct ifaddr *ifa; 740194760Srwatson 74178064Sume in6 = in6addr_loopback; 742194760Srwatson ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 743194760Srwatson if (ifa == NULL) { 74462587Sitojun if (in6_ifattach_loopback(ifp) != 0) 74562587Sitojun return; 746194760Srwatson } else 747194760Srwatson ifa_free(ifa); 74862587Sitojun } 74953541Sshin 75053541Sshin /* 751120913Sume * assign a link-local address, if there's none. 75253541Sshin */ 753197138Shrs if (ifp->if_type != IFT_BRIDGE && 754197138Shrs !(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 755197138Shrs ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 756197138Shrs int error; 757197138Shrs 75878064Sume ia = in6ifa_ifpforlinklocal(ifp, 0); 75978064Sume if (ia == NULL) { 760197138Shrs error = in6_ifattach_linklocal(ifp, altifp); 761197138Shrs if (error) 762197138Shrs log(LOG_NOTICE, "in6_ifattach_linklocal: " 763197138Shrs "failed to add a link-local addr to %s\n", 764197138Shrs if_name(ifp)); 765194760Srwatson } else 766194760Srwatson ifa_free(&ia->ia_ifa); 76753541Sshin } 76853541Sshin 76978064Sume#ifdef IFT_STF /* XXX */ 770120913Sumestatinit: 77178064Sume#endif 77262587Sitojun 77353541Sshin /* update dynamically. */ 774181803Sbz if (V_in6_maxmtu < ifp->if_mtu) 775181803Sbz V_in6_maxmtu = ifp->if_mtu; 77653541Sshin} 77753541Sshin 77862587Sitojun/* 77962587Sitojun * NOTE: in6_ifdetach() does not support loopback if at this moment. 78078064Sume * We don't need this function in bsdi, because interfaces are never removed 78178064Sume * from the ifnet list in bsdi. 78262587Sitojun */ 78353541Sshinvoid 784171259Sdelphijin6_ifdetach(struct ifnet *ifp) 78553541Sshin{ 786194907Srwatson struct in6_ifaddr *ia; 78762587Sitojun struct ifaddr *ifa, *next; 788193232Sbz struct radix_node_head *rnh; 78953541Sshin struct rtentry *rt; 79053541Sshin short rtflags; 79162587Sitojun struct sockaddr_in6 sin6; 792170202Sjinmei struct in6_multi_mship *imm; 79353541Sshin 79462587Sitojun /* remove neighbor management table */ 79562587Sitojun nd6_purge(ifp); 79662587Sitojun 79762587Sitojun /* nuke any of IPv6 addresses we have */ 798191340Srwatson TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 79962587Sitojun if (ifa->ifa_addr->sa_family != AF_INET6) 80062587Sitojun continue; 80178064Sume in6_purgeaddr(ifa); 80262587Sitojun } 80362587Sitojun 80462587Sitojun /* undo everything done by in6_ifattach(), just in case */ 805191340Srwatson TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 80653541Sshin if (ifa->ifa_addr->sa_family != AF_INET6 80753541Sshin || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 80853541Sshin continue; 80953541Sshin } 81053541Sshin 81153541Sshin ia = (struct in6_ifaddr *)ifa; 81253541Sshin 813170202Sjinmei /* 814170202Sjinmei * leave from multicast groups we have joined for the interface 815170202Sjinmei */ 816170202Sjinmei while ((imm = ia->ia6_memberships.lh_first) != NULL) { 817170202Sjinmei LIST_REMOVE(imm, i6mm_chain); 818170202Sjinmei in6_leavegroup(imm); 819170202Sjinmei } 820170202Sjinmei 82153541Sshin /* remove from the routing table */ 822120913Sume if ((ia->ia_flags & IFA_ROUTE) && 823120913Sume (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 82453541Sshin rtflags = rt->rt_flags; 825187946Sbz RTFREE_LOCKED(rt); 826120913Sume rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 827120913Sume (struct sockaddr *)&ia->ia_addr, 828120913Sume (struct sockaddr *)&ia->ia_prefixmask, 829120913Sume rtflags, (struct rtentry **)0); 83053541Sshin } 83153541Sshin 83253541Sshin /* remove from the linked list */ 833191337Srwatson IF_ADDR_LOCK(ifp); 834194907Srwatson TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 835191337Srwatson IF_ADDR_UNLOCK(ifp); 836194907Srwatson ifa_free(ifa); /* if_addrhead */ 83753541Sshin 838194971Srwatson IN6_IFADDR_WLOCK(); 839194907Srwatson TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 840194971Srwatson IN6_IFADDR_WUNLOCK(); 841194907Srwatson ifa_free(ifa); 84253541Sshin } 84362587Sitojun 844181803Sbz in6_pcbpurgeif0(&V_udbinfo, ifp); 845181803Sbz in6_pcbpurgeif0(&V_ripcbinfo, ifp); 846170613Sbms /* leave from all multicast groups joined */ 847170613Sbms in6_purgemaddrs(ifp); 848120913Sume 84978064Sume /* 85078064Sume * remove neighbor management table. we call it twice just to make 85178064Sume * sure we nuke everything. maybe we need just one call. 85278064Sume * XXX: since the first call did not release addresses, some prefixes 85378064Sume * might remain. We should call nd6_purge() again to release the 85478064Sume * prefixes after removing all addresses above. 85578064Sume * (Or can we just delay calling nd6_purge until at this point?) 85678064Sume */ 85762587Sitojun nd6_purge(ifp); 85862587Sitojun 85962587Sitojun /* remove route to link-local allnodes multicast (ff02::1) */ 86062587Sitojun bzero(&sin6, sizeof(sin6)); 86162587Sitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 86262587Sitojun sin6.sin6_family = AF_INET6; 86362587Sitojun sin6.sin6_addr = in6addr_linklocal_allnodes; 864148385Sume if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 865148385Sume /* XXX: should not fail */ 866148385Sume return; 867121770Ssam /* XXX grab lock first to avoid LOR */ 868193232Sbz rnh = rt_tables_get_rnh(0, AF_INET6); 869193232Sbz if (rnh != NULL) { 870193232Sbz RADIX_NODE_HEAD_LOCK(rnh); 871185965Skmacy rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 872124333Struckman if (rt) { 873124333Struckman if (rt->rt_ifp == ifp) 874124333Struckman rtexpunge(rt); 875124333Struckman RTFREE_LOCKED(rt); 876124333Struckman } 877193232Sbz RADIX_NODE_HEAD_UNLOCK(rnh); 87862587Sitojun } 87953541Sshin} 88078064Sume 881151539Ssuzint 882171259Sdelphijin6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 883171259Sdelphij const u_int8_t *baseid, int generate) 88478064Sume{ 88578064Sume u_int8_t nullbuf[8]; 886121161Sume struct nd_ifinfo *ndi = ND_IFINFO(ifp); 88778064Sume 88878064Sume bzero(nullbuf, sizeof(nullbuf)); 88978064Sume if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 89078064Sume /* we've never created a random ID. Create a new one. */ 89178064Sume generate = 1; 89278064Sume } 89378064Sume 89478064Sume if (generate) { 89578064Sume bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 89678064Sume 89778064Sume /* generate_tmp_ifid will update seedn and buf */ 89878064Sume (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 899120913Sume ndi->randomid); 90078064Sume } 90178064Sume bcopy(ndi->randomid, retbuf, 8); 902151539Ssuz 903151539Ssuz return (0); 90478064Sume} 90578064Sume 90678064Sumevoid 907191688Szecin6_tmpaddrtimer(void *arg) 90878064Sume{ 909191688Szec CURVNET_SET((struct vnet *) arg); 91078064Sume struct nd_ifinfo *ndi; 91178064Sume u_int8_t nullbuf[8]; 912121161Sume struct ifnet *ifp; 91378064Sume 914181803Sbz callout_reset(&V_in6_tmpaddrtimer_ch, 915181803Sbz (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 916191688Szec V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 91778064Sume 91878064Sume bzero(nullbuf, sizeof(nullbuf)); 919181887Sjulian for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 920181888Sjulian ifp = TAILQ_NEXT(ifp, if_list)) { 921121161Sume ndi = ND_IFINFO(ifp); 92278064Sume if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 92378064Sume /* 92478064Sume * We've been generating a random ID on this interface. 92578064Sume * Create a new one. 92678064Sume */ 92778064Sume (void)generate_tmp_ifid(ndi->randomseed0, 928120913Sume ndi->randomseed1, ndi->randomid); 92978064Sume } 93078064Sume } 93178064Sume 932191688Szec CURVNET_RESTORE(); 93378064Sume} 934170613Sbms 935170613Sbmsstatic void 936171259Sdelphijin6_purgemaddrs(struct ifnet *ifp) 937170613Sbms{ 938191672Sbms LIST_HEAD(,in6_multi) purgeinms; 939191672Sbms struct in6_multi *inm, *tinm; 940191672Sbms struct ifmultiaddr *ifma; 941170613Sbms 942191672Sbms LIST_INIT(&purgeinms); 943191672Sbms IN6_MULTI_LOCK(); 944191672Sbms 945191672Sbms /* 946191672Sbms * Extract list of in6_multi associated with the detaching ifp 947191672Sbms * which the PF_INET6 layer is about to release. 948191672Sbms * We need to do this as IF_ADDR_LOCK() may be re-acquired 949191672Sbms * by code further down. 950191672Sbms */ 951191672Sbms IF_ADDR_LOCK(ifp); 952191672Sbms TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 953191672Sbms if (ifma->ifma_addr->sa_family != AF_INET6 || 954191672Sbms ifma->ifma_protospec == NULL) 955191672Sbms continue; 956191672Sbms inm = (struct in6_multi *)ifma->ifma_protospec; 957191672Sbms LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 958170613Sbms } 959191672Sbms IF_ADDR_UNLOCK(ifp); 960191672Sbms 961191672Sbms LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 962191672Sbms LIST_REMOVE(inm, in6m_entry); 963191672Sbms in6m_release_locked(inm); 964191672Sbms } 965191672Sbms mld_ifdetach(ifp); 966191672Sbms 967191672Sbms IN6_MULTI_UNLOCK(); 968170613Sbms} 969