962 lines
25 KiB
C
962 lines
25 KiB
C
/*-
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/syslog.h>
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#include <sys/md5.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/if_ether.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/mld6_var.h>
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#include <netinet6/scope6_var.h>
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VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
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#ifdef IP6_AUTO_LINKLOCAL
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VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
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#else
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VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
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#endif
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VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
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#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
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VNET_DECLARE(struct inpcbinfo, ripcbinfo);
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#define V_ripcbinfo VNET(ripcbinfo)
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static int get_rand_ifid(struct ifnet *, struct in6_addr *);
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static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
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static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
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static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
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static int in6_ifattach_loopback(struct ifnet *);
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static void in6_purgemaddrs(struct ifnet *);
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#define EUI64_GBIT 0x01
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#define EUI64_UBIT 0x02
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#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
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#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
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#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
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#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
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#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
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#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
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#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
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/*
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* Generate a last-resort interface identifier, when the machine has no
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* IEEE802/EUI64 address sources.
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* The goal here is to get an interface identifier that is
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* (1) random enough and (2) does not change across reboot.
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* We currently use MD5(hostname) for it.
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*
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* in6 - upper 64bits are preserved
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*/
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static int
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get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
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{
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MD5_CTX ctxt;
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struct prison *pr;
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u_int8_t digest[16];
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int hostnamelen;
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pr = curthread->td_ucred->cr_prison;
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mtx_lock(&pr->pr_mtx);
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hostnamelen = strlen(pr->pr_hostname);
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#if 0
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/* we need at least several letters as seed for ifid */
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if (hostnamelen < 3) {
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mtx_unlock(&pr->pr_mtx);
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return -1;
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}
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#endif
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/* generate 8 bytes of pseudo-random value. */
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bzero(&ctxt, sizeof(ctxt));
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MD5Init(&ctxt);
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MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
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mtx_unlock(&pr->pr_mtx);
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MD5Final(digest, &ctxt);
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/* assumes sizeof(digest) > sizeof(ifid) */
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bcopy(digest, &in6->s6_addr[8], 8);
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/* make sure to set "u" bit to local, and "g" bit to individual. */
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in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
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in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
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/* convert EUI64 into IPv6 interface identifier */
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EUI64_TO_IFID(in6);
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return 0;
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}
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static int
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generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
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{
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MD5_CTX ctxt;
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u_int8_t seed[16], digest[16], nullbuf[8];
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u_int32_t val32;
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/* If there's no history, start with a random seed. */
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bzero(nullbuf, sizeof(nullbuf));
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if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
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int i;
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for (i = 0; i < 2; i++) {
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val32 = arc4random();
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bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
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}
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} else
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bcopy(seed0, seed, 8);
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/* copy the right-most 64-bits of the given address */
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/* XXX assumption on the size of IFID */
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bcopy(seed1, &seed[8], 8);
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if (0) { /* for debugging purposes only */
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int i;
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printf("generate_tmp_ifid: new randomized ID from: ");
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for (i = 0; i < 16; i++)
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printf("%02x", seed[i]);
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printf(" ");
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}
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/* generate 16 bytes of pseudo-random value. */
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bzero(&ctxt, sizeof(ctxt));
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MD5Init(&ctxt);
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MD5Update(&ctxt, seed, sizeof(seed));
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MD5Final(digest, &ctxt);
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/*
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* RFC 3041 3.2.1. (3)
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* Take the left-most 64-bits of the MD5 digest and set bit 6 (the
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* left-most bit is numbered 0) to zero.
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*/
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bcopy(digest, ret, 8);
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ret[0] &= ~EUI64_UBIT;
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/*
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* XXX: we'd like to ensure that the generated value is not zero
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* for simplicity. If the caclculated digest happens to be zero,
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* use a random non-zero value as the last resort.
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*/
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if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
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nd6log((LOG_INFO,
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"generate_tmp_ifid: computed MD5 value is zero.\n"));
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val32 = arc4random();
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val32 = 1 + (val32 % (0xffffffff - 1));
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}
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/*
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* RFC 3041 3.2.1. (4)
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* Take the rightmost 64-bits of the MD5 digest and save them in
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* stable storage as the history value to be used in the next
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* iteration of the algorithm.
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*/
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bcopy(&digest[8], seed0, 8);
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if (0) { /* for debugging purposes only */
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int i;
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printf("to: ");
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for (i = 0; i < 16; i++)
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printf("%02x", digest[i]);
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printf("\n");
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}
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return 0;
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}
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/*
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* Get interface identifier for the specified interface.
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* XXX assumes single sockaddr_dl (AF_LINK address) per an interface
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*
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* in6 - upper 64bits are preserved
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*/
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int
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in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
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{
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struct ifaddr *ifa;
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struct sockaddr_dl *sdl;
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u_int8_t *addr;
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size_t addrlen;
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static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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static u_int8_t allone[8] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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IF_ADDR_RLOCK(ifp);
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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if (ifa->ifa_addr->sa_family != AF_LINK)
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continue;
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sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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if (sdl == NULL)
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continue;
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if (sdl->sdl_alen == 0)
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continue;
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goto found;
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}
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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found:
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IF_ADDR_LOCK_ASSERT(ifp);
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addr = LLADDR(sdl);
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addrlen = sdl->sdl_alen;
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/* get EUI64 */
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switch (ifp->if_type) {
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case IFT_BRIDGE:
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case IFT_ETHER:
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case IFT_L2VLAN:
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case IFT_FDDI:
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case IFT_ISO88025:
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case IFT_ATM:
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case IFT_IEEE1394:
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#ifdef IFT_IEEE80211
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case IFT_IEEE80211:
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#endif
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/* IEEE802/EUI64 cases - what others? */
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/* IEEE1394 uses 16byte length address starting with EUI64 */
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if (addrlen > 8)
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addrlen = 8;
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/* look at IEEE802/EUI64 only */
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if (addrlen != 8 && addrlen != 6) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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/*
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* check for invalid MAC address - on bsdi, we see it a lot
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* since wildboar configures all-zero MAC on pccard before
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* card insertion.
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*/
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if (bcmp(addr, allzero, addrlen) == 0) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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if (bcmp(addr, allone, addrlen) == 0) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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/* make EUI64 address */
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if (addrlen == 8)
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bcopy(addr, &in6->s6_addr[8], 8);
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else if (addrlen == 6) {
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in6->s6_addr[8] = addr[0];
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in6->s6_addr[9] = addr[1];
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in6->s6_addr[10] = addr[2];
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in6->s6_addr[11] = 0xff;
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in6->s6_addr[12] = 0xfe;
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in6->s6_addr[13] = addr[3];
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in6->s6_addr[14] = addr[4];
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in6->s6_addr[15] = addr[5];
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}
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break;
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case IFT_ARCNET:
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if (addrlen != 1) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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if (!addr[0]) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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bzero(&in6->s6_addr[8], 8);
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in6->s6_addr[15] = addr[0];
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/*
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* due to insufficient bitwidth, we mark it local.
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*/
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in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
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in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
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break;
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case IFT_GIF:
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#ifdef IFT_STF
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case IFT_STF:
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#endif
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/*
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* RFC2893 says: "SHOULD use IPv4 address as ifid source".
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* however, IPv4 address is not very suitable as unique
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* identifier source (can be renumbered).
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* we don't do this.
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*/
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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default:
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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/* sanity check: g bit must not indicate "group" */
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if (EUI64_GROUP(in6)) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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/* convert EUI64 into IPv6 interface identifier */
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EUI64_TO_IFID(in6);
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/*
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* sanity check: ifid must not be all zero, avoid conflict with
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* subnet router anycast
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*/
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if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
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bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
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IF_ADDR_RUNLOCK(ifp);
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return -1;
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}
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IF_ADDR_RUNLOCK(ifp);
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return 0;
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}
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/*
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* Get interface identifier for the specified interface. If it is not
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* available on ifp0, borrow interface identifier from other information
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* sources.
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*
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* altifp - secondary EUI64 source
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*/
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static int
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get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
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struct in6_addr *in6)
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{
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struct ifnet *ifp;
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/* first, try to get it from the interface itself */
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if (in6_get_hw_ifid(ifp0, in6) == 0) {
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nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
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if_name(ifp0)));
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goto success;
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}
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/* try secondary EUI64 source. this basically is for ATM PVC */
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if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
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nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
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if_name(ifp0), if_name(altifp)));
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goto success;
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}
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/* next, try to get it from some other hardware interface */
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IFNET_RLOCK_NOSLEEP();
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TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
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if (ifp == ifp0)
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continue;
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if (in6_get_hw_ifid(ifp, in6) != 0)
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continue;
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/*
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* to borrow ifid from other interface, ifid needs to be
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* globally unique
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*/
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if (IFID_UNIVERSAL(in6)) {
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nd6log((LOG_DEBUG,
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"%s: borrow interface identifier from %s\n",
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if_name(ifp0), if_name(ifp)));
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IFNET_RUNLOCK_NOSLEEP();
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goto success;
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}
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}
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IFNET_RUNLOCK_NOSLEEP();
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|
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/* last resort: get from random number source */
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if (get_rand_ifid(ifp, in6) == 0) {
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nd6log((LOG_DEBUG,
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"%s: interface identifier generated by random number\n",
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if_name(ifp0)));
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goto success;
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}
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printf("%s: failed to get interface identifier\n", if_name(ifp0));
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return -1;
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success:
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nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
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if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
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in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
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in6->s6_addr[14], in6->s6_addr[15]));
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return 0;
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}
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|
|
/*
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* altifp - secondary EUI64 source
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*/
|
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static int
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in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
|
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{
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struct in6_ifaddr *ia;
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struct in6_aliasreq ifra;
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struct nd_prefixctl pr0;
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int error;
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|
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/*
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* configure link-local address.
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*/
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in6_prepare_ifra(&ifra, NULL, &in6mask64);
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ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
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ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
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if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
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ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
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ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
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} else {
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if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
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nd6log((LOG_ERR,
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"%s: no ifid available\n", if_name(ifp)));
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return (-1);
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}
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}
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if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
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return (-1);
|
|
|
|
/* link-local addresses should NEVER expire. */
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ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
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|
ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
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|
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/*
|
|
* Now call in6_update_ifa() to do a bunch of procedures to configure
|
|
* a link-local address. We can set the 3rd argument to NULL, because
|
|
* we know there's no other link-local address on the interface
|
|
* and therefore we are adding one (instead of updating one).
|
|
*/
|
|
if ((error = in6_update_ifa(ifp, &ifra, NULL,
|
|
IN6_IFAUPDATE_DADDELAY)) != 0) {
|
|
/*
|
|
* XXX: When the interface does not support IPv6, this call
|
|
* would fail in the SIOCSIFADDR ioctl. I believe the
|
|
* notification is rather confusing in this case, so just
|
|
* suppress it. (jinmei@kame.net 20010130)
|
|
*/
|
|
if (error != EAFNOSUPPORT)
|
|
nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
|
|
"configure a link-local address on %s "
|
|
"(errno=%d)\n",
|
|
if_name(ifp), error));
|
|
return (-1);
|
|
}
|
|
|
|
ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
|
|
KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
|
|
|
|
ifa_free(&ia->ia_ifa);
|
|
|
|
/*
|
|
* Make the link-local prefix (fe80::%link/64) as on-link.
|
|
* Since we'd like to manage prefixes separately from addresses,
|
|
* we make an ND6 prefix structure for the link-local prefix,
|
|
* and add it to the prefix list as a never-expire prefix.
|
|
* XXX: this change might affect some existing code base...
|
|
*/
|
|
bzero(&pr0, sizeof(pr0));
|
|
pr0.ndpr_ifp = ifp;
|
|
/* this should be 64 at this moment. */
|
|
pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
|
|
pr0.ndpr_prefix = ifra.ifra_addr;
|
|
/* apply the mask for safety. (nd6_prelist_add will apply it again) */
|
|
IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64);
|
|
/*
|
|
* Initialize parameters. The link-local prefix must always be
|
|
* on-link, and its lifetimes never expire.
|
|
*/
|
|
pr0.ndpr_raf_onlink = 1;
|
|
pr0.ndpr_raf_auto = 1; /* probably meaningless */
|
|
pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
|
|
pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
|
|
/*
|
|
* Since there is no other link-local addresses, nd6_prefix_lookup()
|
|
* probably returns NULL. However, we cannot always expect the result.
|
|
* For example, if we first remove the (only) existing link-local
|
|
* address, and then reconfigure another one, the prefix is still
|
|
* valid with referring to the old link-local address.
|
|
*/
|
|
if (nd6_prefix_lookup(&pr0) == NULL) {
|
|
if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
|
|
return (error);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ifp - must be IFT_LOOP
|
|
*/
|
|
static int
|
|
in6_ifattach_loopback(struct ifnet *ifp)
|
|
{
|
|
struct in6_aliasreq ifra;
|
|
int error;
|
|
|
|
in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128);
|
|
|
|
/*
|
|
* Always initialize ia_dstaddr (= broadcast address) to loopback
|
|
* address. Follows IPv4 practice - see in_ifinit().
|
|
*/
|
|
ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
|
|
ifra.ifra_dstaddr.sin6_family = AF_INET6;
|
|
ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
|
|
|
|
/* the loopback address should NEVER expire. */
|
|
ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
|
|
ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
|
|
|
|
/* we don't need to perform DAD on loopback interfaces. */
|
|
ifra.ifra_flags |= IN6_IFF_NODAD;
|
|
|
|
/* skip registration to the prefix list. XXX should be temporary. */
|
|
ifra.ifra_flags |= IN6_IFF_NOPFX;
|
|
|
|
/*
|
|
* We are sure that this is a newly assigned address, so we can set
|
|
* NULL to the 3rd arg.
|
|
*/
|
|
if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
|
|
nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
|
|
"the loopback address on %s (errno=%d)\n",
|
|
if_name(ifp), error));
|
|
return (-1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* compute NI group address, based on the current hostname setting.
|
|
* see RFC 4620.
|
|
*
|
|
* when ifp == NULL, the caller is responsible for filling scopeid.
|
|
*
|
|
* If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address
|
|
* while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620.
|
|
*/
|
|
static int
|
|
in6_nigroup0(struct ifnet *ifp, const char *name, int namelen,
|
|
struct in6_addr *in6, int oldmcprefix)
|
|
{
|
|
struct prison *pr;
|
|
const char *p;
|
|
u_char *q;
|
|
MD5_CTX ctxt;
|
|
u_int8_t digest[16];
|
|
char l;
|
|
char n[64]; /* a single label must not exceed 63 chars */
|
|
|
|
/*
|
|
* If no name is given and namelen is -1,
|
|
* we try to do the hostname lookup ourselves.
|
|
*/
|
|
if (!name && namelen == -1) {
|
|
pr = curthread->td_ucred->cr_prison;
|
|
mtx_lock(&pr->pr_mtx);
|
|
name = pr->pr_hostname;
|
|
namelen = strlen(name);
|
|
} else
|
|
pr = NULL;
|
|
if (!name || !namelen) {
|
|
if (pr != NULL)
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return -1;
|
|
}
|
|
|
|
p = name;
|
|
while (p && *p && *p != '.' && p - name < namelen)
|
|
p++;
|
|
if (p == name || p - name > sizeof(n) - 1) {
|
|
if (pr != NULL)
|
|
mtx_unlock(&pr->pr_mtx);
|
|
return -1; /* label too long */
|
|
}
|
|
l = p - name;
|
|
strncpy(n, name, l);
|
|
if (pr != NULL)
|
|
mtx_unlock(&pr->pr_mtx);
|
|
n[(int)l] = '\0';
|
|
for (q = n; *q; q++) {
|
|
if ('A' <= *q && *q <= 'Z')
|
|
*q = *q - 'A' + 'a';
|
|
}
|
|
|
|
/* generate 16 bytes of pseudo-random value. */
|
|
bzero(&ctxt, sizeof(ctxt));
|
|
MD5Init(&ctxt);
|
|
MD5Update(&ctxt, &l, sizeof(l));
|
|
MD5Update(&ctxt, n, l);
|
|
MD5Final(digest, &ctxt);
|
|
|
|
bzero(in6, sizeof(*in6));
|
|
in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
|
|
in6->s6_addr8[11] = 2;
|
|
if (oldmcprefix == 0) {
|
|
in6->s6_addr8[12] = 0xff;
|
|
/* Copy the first 24 bits of 128-bit hash into the address. */
|
|
bcopy(digest, &in6->s6_addr8[13], 3);
|
|
} else {
|
|
/* Copy the first 32 bits of 128-bit hash into the address. */
|
|
bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
|
|
}
|
|
if (in6_setscope(in6, ifp, NULL))
|
|
return (-1); /* XXX: should not fail */
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
|
|
struct in6_addr *in6)
|
|
{
|
|
|
|
return (in6_nigroup0(ifp, name, namelen, in6, 0));
|
|
}
|
|
|
|
int
|
|
in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen,
|
|
struct in6_addr *in6)
|
|
{
|
|
|
|
return (in6_nigroup0(ifp, name, namelen, in6, 1));
|
|
}
|
|
|
|
/*
|
|
* XXX multiple loopback interface needs more care. for instance,
|
|
* nodelocal address needs to be configured onto only one of them.
|
|
* XXX multiple link-local address case
|
|
*
|
|
* altifp - secondary EUI64 source
|
|
*/
|
|
void
|
|
in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
|
|
{
|
|
struct in6_ifaddr *ia;
|
|
struct in6_addr in6;
|
|
|
|
if (ifp->if_afdata[AF_INET6] == NULL)
|
|
return;
|
|
/*
|
|
* quirks based on interface type
|
|
*/
|
|
switch (ifp->if_type) {
|
|
case IFT_STF:
|
|
/*
|
|
* 6to4 interface is a very special kind of beast.
|
|
* no multicast, no linklocal. RFC2529 specifies how to make
|
|
* linklocals for 6to4 interface, but there's no use and
|
|
* it is rather harmful to have one.
|
|
*/
|
|
ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* usually, we require multicast capability to the interface
|
|
*/
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
|
|
nd6log((LOG_INFO, "in6_ifattach: "
|
|
"%s is not multicast capable, IPv6 not enabled\n",
|
|
if_name(ifp)));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* assign loopback address for loopback interface.
|
|
* XXX multiple loopback interface case.
|
|
*/
|
|
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
|
|
struct ifaddr *ifa;
|
|
|
|
in6 = in6addr_loopback;
|
|
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
|
|
if (ifa == NULL) {
|
|
if (in6_ifattach_loopback(ifp) != 0)
|
|
return;
|
|
} else
|
|
ifa_free(ifa);
|
|
}
|
|
|
|
/*
|
|
* assign a link-local address, if there's none.
|
|
*/
|
|
if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
|
|
ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
|
|
int error;
|
|
|
|
ia = in6ifa_ifpforlinklocal(ifp, 0);
|
|
if (ia == NULL) {
|
|
error = in6_ifattach_linklocal(ifp, altifp);
|
|
#if 0
|
|
if (error)
|
|
log(LOG_NOTICE, "in6_ifattach_linklocal: "
|
|
"failed to add a link-local addr to %s\n",
|
|
if_name(ifp));
|
|
#endif
|
|
} else
|
|
ifa_free(&ia->ia_ifa);
|
|
}
|
|
|
|
/* update dynamically. */
|
|
if (V_in6_maxmtu < ifp->if_mtu)
|
|
V_in6_maxmtu = ifp->if_mtu;
|
|
}
|
|
|
|
/*
|
|
* NOTE: in6_ifdetach() does not support loopback if at this moment.
|
|
* We don't need this function in bsdi, because interfaces are never removed
|
|
* from the ifnet list in bsdi.
|
|
*/
|
|
void
|
|
in6_ifdetach(struct ifnet *ifp)
|
|
{
|
|
struct in6_ifaddr *ia;
|
|
struct ifaddr *ifa, *next;
|
|
struct radix_node_head *rnh;
|
|
struct rtentry *rt;
|
|
struct sockaddr_in6 sin6;
|
|
struct in6_multi_mship *imm;
|
|
|
|
if (ifp->if_afdata[AF_INET6] == NULL)
|
|
return;
|
|
|
|
/* remove neighbor management table */
|
|
nd6_purge(ifp);
|
|
|
|
/* nuke any of IPv6 addresses we have */
|
|
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
in6_purgeaddr(ifa);
|
|
}
|
|
|
|
/* undo everything done by in6_ifattach(), just in case */
|
|
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6
|
|
|| !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
|
|
continue;
|
|
}
|
|
|
|
ia = (struct in6_ifaddr *)ifa;
|
|
|
|
/*
|
|
* leave from multicast groups we have joined for the interface
|
|
*/
|
|
while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
|
|
LIST_REMOVE(imm, i6mm_chain);
|
|
in6_leavegroup(imm);
|
|
}
|
|
|
|
/* Remove link-local from the routing table. */
|
|
if (ia->ia_flags & IFA_ROUTE)
|
|
(void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags);
|
|
|
|
/* remove from the linked list */
|
|
IF_ADDR_WLOCK(ifp);
|
|
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
ifa_free(ifa); /* if_addrhead */
|
|
|
|
IN6_IFADDR_WLOCK();
|
|
TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
|
|
IN6_IFADDR_WUNLOCK();
|
|
ifa_free(ifa);
|
|
}
|
|
|
|
in6_pcbpurgeif0(&V_udbinfo, ifp);
|
|
in6_pcbpurgeif0(&V_ulitecbinfo, ifp);
|
|
in6_pcbpurgeif0(&V_ripcbinfo, ifp);
|
|
/* leave from all multicast groups joined */
|
|
in6_purgemaddrs(ifp);
|
|
|
|
/*
|
|
* remove neighbor management table. we call it twice just to make
|
|
* sure we nuke everything. maybe we need just one call.
|
|
* XXX: since the first call did not release addresses, some prefixes
|
|
* might remain. We should call nd6_purge() again to release the
|
|
* prefixes after removing all addresses above.
|
|
* (Or can we just delay calling nd6_purge until at this point?)
|
|
*/
|
|
nd6_purge(ifp);
|
|
|
|
/*
|
|
* Remove route to link-local allnodes multicast (ff02::1).
|
|
* These only get automatically installed for the default FIB.
|
|
*/
|
|
bzero(&sin6, sizeof(sin6));
|
|
sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
sin6.sin6_family = AF_INET6;
|
|
sin6.sin6_addr = in6addr_linklocal_allnodes;
|
|
if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
|
|
/* XXX: should not fail */
|
|
return;
|
|
/* XXX grab lock first to avoid LOR */
|
|
rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6);
|
|
if (rnh != NULL) {
|
|
RADIX_NODE_HEAD_LOCK(rnh);
|
|
rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED,
|
|
RT_DEFAULT_FIB);
|
|
if (rt) {
|
|
if (rt->rt_ifp == ifp)
|
|
rt_expunge(rnh, rt);
|
|
RTFREE_LOCKED(rt);
|
|
}
|
|
RADIX_NODE_HEAD_UNLOCK(rnh);
|
|
}
|
|
}
|
|
|
|
int
|
|
in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
|
|
const u_int8_t *baseid, int generate)
|
|
{
|
|
u_int8_t nullbuf[8];
|
|
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
|
|
|
|
bzero(nullbuf, sizeof(nullbuf));
|
|
if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
|
|
/* we've never created a random ID. Create a new one. */
|
|
generate = 1;
|
|
}
|
|
|
|
if (generate) {
|
|
bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
|
|
|
|
/* generate_tmp_ifid will update seedn and buf */
|
|
(void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
|
|
ndi->randomid);
|
|
}
|
|
bcopy(ndi->randomid, retbuf, 8);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
in6_tmpaddrtimer(void *arg)
|
|
{
|
|
CURVNET_SET((struct vnet *) arg);
|
|
struct nd_ifinfo *ndi;
|
|
u_int8_t nullbuf[8];
|
|
struct ifnet *ifp;
|
|
|
|
callout_reset(&V_in6_tmpaddrtimer_ch,
|
|
(V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
|
|
V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
|
|
|
|
bzero(nullbuf, sizeof(nullbuf));
|
|
TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
|
|
if (ifp->if_afdata[AF_INET6] == NULL)
|
|
continue;
|
|
ndi = ND_IFINFO(ifp);
|
|
if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
|
|
/*
|
|
* We've been generating a random ID on this interface.
|
|
* Create a new one.
|
|
*/
|
|
(void)generate_tmp_ifid(ndi->randomseed0,
|
|
ndi->randomseed1, ndi->randomid);
|
|
}
|
|
}
|
|
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
static void
|
|
in6_purgemaddrs(struct ifnet *ifp)
|
|
{
|
|
LIST_HEAD(,in6_multi) purgeinms;
|
|
struct in6_multi *inm, *tinm;
|
|
struct ifmultiaddr *ifma;
|
|
|
|
LIST_INIT(&purgeinms);
|
|
IN6_MULTI_LOCK();
|
|
|
|
/*
|
|
* Extract list of in6_multi associated with the detaching ifp
|
|
* which the PF_INET6 layer is about to release.
|
|
* We need to do this as IF_ADDR_LOCK() may be re-acquired
|
|
* by code further down.
|
|
*/
|
|
IF_ADDR_RLOCK(ifp);
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET6 ||
|
|
ifma->ifma_protospec == NULL)
|
|
continue;
|
|
inm = (struct in6_multi *)ifma->ifma_protospec;
|
|
LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
|
|
}
|
|
IF_ADDR_RUNLOCK(ifp);
|
|
|
|
LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
|
|
LIST_REMOVE(inm, in6m_entry);
|
|
in6m_release_locked(inm);
|
|
}
|
|
mld_ifdetach(ifp);
|
|
|
|
IN6_MULTI_UNLOCK();
|
|
}
|