When epoch(9) was introduced to network stack, it was basically dropped in place of existing locking, which was mutexes and rwlocks. For the sake of performance mutex covered areas were as small as possible, so became epoch covered areas. However, epoch doesn't introduce any contention, it just delays memory reclaim. So, there is no point to minimise epoch covered areas in sense of performance. Meanwhile entering/exiting epoch also has non-zero CPU usage, so doing this less often is a win. Not the least is also code maintainability. In the new paradigm we can assume that at any stage of processing a packet, we are inside network epoch. This makes coding both input and output path way easier. On output path we already enter epoch quite early - in the ip_output(), in the ip6_output(). This patch does the same for the input path. All ISR processing, network related callouts, other ways of packet injection to the network stack shall be performed in net_epoch. Any leaf function that walks network configuration now asserts epoch. Tricky part is configuration code paths - ioctls, sysctls. They also call into leaf functions, so some need to be changed. This patch would introduce more epoch recursions (see EPOCH_TRACE) than we had before. They will be cleaned up separately, as several of them aren't trivial. Note, that unlike a lock recursion the epoch recursion is safe and just wastes a bit of resources. Reviewed by: gallatin, hselasky, cy, adrian, kristof Differential Revision: https://reviews.freebsd.org/D19111
894 lines
23 KiB
C
894 lines
23 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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/lock.h>
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#include <sys/proc.h>
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#include <sys/rmlock.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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NET_EPOCH_ASSERT();
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CK_STAILQ_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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return -1;
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found:
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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_ATM:
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case IFT_IEEE1394:
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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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return -1;
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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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return -1;
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if (bcmp(addr, allone, addrlen) == 0)
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return -1;
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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_GIF:
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case IFT_STF:
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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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return -1;
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case IFT_INFINIBAND:
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if (addrlen != 20)
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return -1;
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bcopy(addr + 12, &in6->s6_addr[8], 8);
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break;
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default:
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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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return -1;
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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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return -1;
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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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NET_EPOCH_ASSERT();
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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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CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
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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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goto success;
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}
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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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/*
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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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struct nd_prefix *pr;
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int error;
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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);
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/* 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
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* a link-local address. We can set the 3rd argument to NULL, because
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* we know there's no other link-local address on the interface
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* and therefore we are adding one (instead of updating one).
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*/
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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);
|
|
if (ia == NULL) {
|
|
/*
|
|
* Another thread removed the address that we just added.
|
|
* This should be rare, but it happens.
|
|
*/
|
|
nd6log((LOG_NOTICE, "%s: %s: new link-local address "
|
|
"disappeared\n", __func__, if_name(ifp)));
|
|
return (-1);
|
|
}
|
|
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 ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
|
|
if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
|
|
return (error);
|
|
} else
|
|
nd6_prefix_rele(pr);
|
|
|
|
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 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;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
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;
|
|
ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD;
|
|
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.
|
|
*/
|
|
if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
|
|
/*
|
|
* check that loopback address doesn't exist yet.
|
|
*/
|
|
ia = in6ifa_ifwithaddr(&in6addr_loopback, 0);
|
|
if (ia == NULL)
|
|
in6_ifattach_loopback(ifp);
|
|
else
|
|
ifa_free(&ia->ia_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) {
|
|
ia = in6ifa_ifpforlinklocal(ifp, 0);
|
|
if (ia == NULL)
|
|
in6_ifattach_linklocal(ifp, altifp);
|
|
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.
|
|
*
|
|
* When shutting down a VNET we clean up layers top-down. In that case
|
|
* upper layer protocols (ulp) are cleaned up already and locks are destroyed
|
|
* and we must not call into these cleanup functions anymore, thus purgeulp
|
|
* is set to 0 in that case by in6_ifdetach_destroy().
|
|
* The normal case of destroying a (cloned) interface still needs to cleanup
|
|
* everything related to the interface and will have purgeulp set to 1.
|
|
*/
|
|
static void
|
|
_in6_ifdetach(struct ifnet *ifp, int purgeulp)
|
|
{
|
|
struct ifaddr *ifa, *next;
|
|
|
|
if (ifp->if_afdata[AF_INET6] == NULL)
|
|
return;
|
|
|
|
/*
|
|
* nuke any of IPv6 addresses we have
|
|
*/
|
|
CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
in6_purgeaddr(ifa);
|
|
}
|
|
if (purgeulp) {
|
|
IN6_MULTI_LOCK();
|
|
in6_pcbpurgeif0(&V_udbinfo, ifp);
|
|
in6_pcbpurgeif0(&V_ulitecbinfo, ifp);
|
|
in6_pcbpurgeif0(&V_ripcbinfo, ifp);
|
|
IN6_MULTI_UNLOCK();
|
|
}
|
|
/* leave from all multicast groups joined */
|
|
in6_purgemaddrs(ifp);
|
|
|
|
/*
|
|
* Remove neighbor management table.
|
|
* Enabling the nd6_purge will panic on vmove for interfaces on VNET
|
|
* teardown as the IPv6 layer is cleaned up already and the locks
|
|
* are destroyed.
|
|
*/
|
|
if (purgeulp)
|
|
nd6_purge(ifp);
|
|
}
|
|
|
|
void
|
|
in6_ifdetach(struct ifnet *ifp)
|
|
{
|
|
|
|
_in6_ifdetach(ifp, 1);
|
|
}
|
|
|
|
void
|
|
in6_ifdetach_destroy(struct ifnet *ifp)
|
|
{
|
|
|
|
_in6_ifdetach(ifp, 0);
|
|
}
|
|
|
|
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));
|
|
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
|
|
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)
|
|
{
|
|
struct in6_multi_head inmh;
|
|
|
|
SLIST_INIT(&inmh);
|
|
IN6_MULTI_LOCK();
|
|
IN6_MULTI_LIST_LOCK();
|
|
mld_ifdetach(ifp, &inmh);
|
|
IN6_MULTI_LIST_UNLOCK();
|
|
IN6_MULTI_UNLOCK();
|
|
in6m_release_list_deferred(&inmh);
|
|
|
|
/*
|
|
* Make sure all multicast deletions invoking if_ioctl() are
|
|
* completed before returning. Else we risk accessing a freed
|
|
* ifnet structure pointer.
|
|
*/
|
|
in6m_release_wait();
|
|
}
|
|
|
|
void
|
|
in6_ifattach_destroy(void)
|
|
{
|
|
|
|
callout_drain(&V_in6_tmpaddrtimer_ch);
|
|
}
|
|
|
|
static void
|
|
in6_ifattach_init(void *dummy)
|
|
{
|
|
|
|
/* Timer for regeneranation of temporary addresses randomize ID. */
|
|
callout_init(&V_in6_tmpaddrtimer_ch, 0);
|
|
callout_reset(&V_in6_tmpaddrtimer_ch,
|
|
(V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
|
|
V_ip6_temp_regen_advance) * hz,
|
|
in6_tmpaddrtimer, curvnet);
|
|
}
|
|
|
|
/*
|
|
* Cheat.
|
|
* This must be after route_init(), which is now SI_ORDER_THIRD.
|
|
*/
|
|
SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
|
|
in6_ifattach_init, NULL);
|