Summary: In preparation of making if_t completely opaque outside of the netstack, explicitly include the header. <net/if_var.h> will stop including the header in the future. Sponsored by: Juniper Networks, Inc. Reviewed by: glebius, melifaro Differential Revision: https://reviews.freebsd.org/D38200
1615 lines
44 KiB
C
1615 lines
44 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: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/eventhandler.h>
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#include <sys/malloc.h>
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#include <sys/libkern.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/queue.h>
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#include <sys/callout.h>
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#include <sys/refcount.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_dl.h>
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#include <net/if_var.h>
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#include <net/if_private.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 <net/if_llatbl.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet/icmp6.h>
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#include <netinet/ip_carp.h>
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#include <netinet6/send.h>
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#define SDL(s) ((struct sockaddr_dl *)s)
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struct dadq;
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static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
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static void nd6_dad_add(struct dadq *dp);
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static void nd6_dad_del(struct dadq *dp);
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static void nd6_dad_rele(struct dadq *);
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static void nd6_dad_starttimer(struct dadq *, int);
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static void nd6_dad_stoptimer(struct dadq *);
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static void nd6_dad_timer(void *);
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static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
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static void nd6_dad_ns_output(struct dadq *);
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static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
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static void nd6_dad_na_input(struct ifaddr *);
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static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
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static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
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static struct ifaddr *nd6_proxy_fill_sdl(struct ifnet *,
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const struct in6_addr *, struct sockaddr_dl *);
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VNET_DEFINE_STATIC(int, dad_enhanced) = 1;
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#define V_dad_enhanced VNET(dad_enhanced)
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(dad_enhanced), 0,
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"Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
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VNET_DEFINE_STATIC(int, dad_maxtry) = 15; /* max # of *tries* to
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transmit DAD packet */
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#define V_dad_maxtry VNET(dad_maxtry)
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/*
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* Input a Neighbor Solicitation Message.
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*
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* Based on RFC 2461
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* Based on RFC 2462 (duplicate address detection)
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*/
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void
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nd6_ns_input(struct mbuf *m, int off, int icmp6len)
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{
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struct ifnet *ifp;
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struct ip6_hdr *ip6;
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struct nd_neighbor_solicit *nd_ns;
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struct in6_addr daddr6, myaddr6, saddr6, taddr6;
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struct ifaddr *ifa;
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struct sockaddr_dl proxydl;
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union nd_opts ndopts;
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char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
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char *lladdr;
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int anycast, lladdrlen, proxy, rflag, tentative, tlladdr;
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ifa = NULL;
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/* RFC 6980: Nodes MUST silently ignore fragments */
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if(m->m_flags & M_FRAGMENTED)
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goto freeit;
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ifp = m->m_pkthdr.rcvif;
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ip6 = mtod(m, struct ip6_hdr *);
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if (__predict_false(ip6->ip6_hlim != 255)) {
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ICMP6STAT_INC(icp6s_invlhlim);
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nd6log((LOG_ERR,
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"nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
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ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
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ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
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goto bads;
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}
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if (m->m_len < off + icmp6len) {
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m = m_pullup(m, off + icmp6len);
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if (m == NULL) {
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IP6STAT_INC(ip6s_exthdrtoolong);
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return;
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}
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}
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ip6 = mtod(m, struct ip6_hdr *);
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nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
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saddr6 = ip6->ip6_src;
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daddr6 = ip6->ip6_dst;
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taddr6 = nd_ns->nd_ns_target;
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if (in6_setscope(&taddr6, ifp, NULL) != 0)
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goto bad;
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rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
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if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
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rflag = 0;
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
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/* dst has to be a solicited node multicast address. */
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if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
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/* don't check ifindex portion */
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daddr6.s6_addr32[1] == 0 &&
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daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
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daddr6.s6_addr8[12] == 0xff) {
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; /* good */
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} else {
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nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
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"(wrong ip6 dst)\n"));
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goto bad;
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}
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} else if (!V_nd6_onlink_ns_rfc4861) {
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struct sockaddr_in6 src_sa6;
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/*
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* According to recent IETF discussions, it is not a good idea
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* to accept a NS from an address which would not be deemed
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* to be a neighbor otherwise. This point is expected to be
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* clarified in future revisions of the specification.
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*/
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bzero(&src_sa6, sizeof(src_sa6));
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src_sa6.sin6_family = AF_INET6;
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src_sa6.sin6_len = sizeof(src_sa6);
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src_sa6.sin6_addr = saddr6;
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if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
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nd6log((LOG_INFO, "nd6_ns_input: "
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"NS packet from non-neighbor\n"));
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goto bad;
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}
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}
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if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
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nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
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goto bad;
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}
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icmp6len -= sizeof(*nd_ns);
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nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
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if (nd6_options(&ndopts) < 0) {
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nd6log((LOG_INFO,
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"nd6_ns_input: invalid ND option, ignored\n"));
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/* nd6_options have incremented stats */
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goto freeit;
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}
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lladdr = NULL;
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lladdrlen = 0;
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if (ndopts.nd_opts_src_lladdr) {
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lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
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lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
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}
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if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
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nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
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"(link-layer address option)\n"));
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goto bad;
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}
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/*
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* Attaching target link-layer address to the NA?
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* (RFC 2461 7.2.4)
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*
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* NS IP dst is unicast/anycast MUST NOT add
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* NS IP dst is solicited-node multicast MUST add
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*
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* In implementation, we add target link-layer address by default.
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* We do not add one in MUST NOT cases.
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*/
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if (!IN6_IS_ADDR_MULTICAST(&daddr6))
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tlladdr = 0;
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else
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tlladdr = 1;
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/*
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* Target address (taddr6) must be either:
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* (1) Valid unicast/anycast address for my receiving interface,
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* (2) Unicast address for which I'm offering proxy service, or
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* (3) "tentative" address on which DAD is being performed.
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*/
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/* (1) and (3) check. */
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if (ifp->if_carp)
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ifa = (*carp_iamatch6_p)(ifp, &taddr6);
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else
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ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
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/* (2) check. */
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proxy = 0;
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if (ifa == NULL) {
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if ((ifa = nd6_proxy_fill_sdl(ifp, &taddr6, &proxydl)) != NULL)
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proxy = 1;
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}
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if (ifa == NULL) {
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/*
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* We've got an NS packet, and we don't have that adddress
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* assigned for us. We MUST silently ignore it.
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* See RFC2461 7.2.3.
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*/
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goto freeit;
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}
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myaddr6 = *IFA_IN6(ifa);
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anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
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tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
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if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
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goto freeit;
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if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
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nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
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"(if %d, NS packet %d)\n",
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ip6_sprintf(ip6bufs, &taddr6),
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ifp->if_addrlen, lladdrlen - 2));
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goto bad;
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}
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if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
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nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
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ip6_sprintf(ip6bufs, &saddr6)));
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goto freeit;
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}
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/*
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* We have neighbor solicitation packet, with target address equals to
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* one of my tentative address.
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*
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* src addr how to process?
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* --- ---
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* multicast of course, invalid (rejected in ip6_input)
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* unicast somebody is doing address resolution -> ignore
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* unspec dup address detection
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*
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* The processing is defined in RFC 2462.
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*/
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if (tentative) {
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/*
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* If source address is unspecified address, it is for
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* duplicate address detection.
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*
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* If not, the packet is for addess resolution;
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* silently ignore it.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
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nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
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goto freeit;
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}
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/*
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* If the source address is unspecified address, entries must not
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* be created or updated.
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* It looks that sender is performing DAD. Output NA toward
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* all-node multicast address, to tell the sender that I'm using
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* the address.
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* S bit ("solicited") must be zero.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
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struct in6_addr in6_all;
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in6_all = in6addr_linklocal_allnodes;
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if (in6_setscope(&in6_all, ifp, NULL) != 0)
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goto bad;
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nd6_na_output_fib(ifp, &in6_all, &taddr6,
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((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
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rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
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M_GETFIB(m));
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goto freeit;
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}
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nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
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ND_NEIGHBOR_SOLICIT, 0);
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nd6_na_output_fib(ifp, &saddr6, &taddr6,
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((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
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rflag | ND_NA_FLAG_SOLICITED, tlladdr,
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proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
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freeit:
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if (ifa != NULL)
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ifa_free(ifa);
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m_freem(m);
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return;
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bad:
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nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
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ip6_sprintf(ip6bufs, &saddr6)));
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nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
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ip6_sprintf(ip6bufs, &daddr6)));
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nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
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ip6_sprintf(ip6bufs, &taddr6)));
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bads:
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ICMP6STAT_INC(icp6s_badns);
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if (ifa != NULL)
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ifa_free(ifa);
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m_freem(m);
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}
|
|
|
|
static struct ifaddr *
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nd6_proxy_fill_sdl(struct ifnet *ifp, const struct in6_addr *taddr6,
|
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struct sockaddr_dl *sdl)
|
|
{
|
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struct ifaddr *ifa;
|
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struct llentry *ln;
|
|
|
|
ifa = NULL;
|
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ln = nd6_lookup(taddr6, LLE_SF(AF_INET6, 0), ifp);
|
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if (ln == NULL)
|
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return (ifa);
|
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if ((ln->la_flags & (LLE_PUB | LLE_VALID)) == (LLE_PUB | LLE_VALID)) {
|
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link_init_sdl(ifp, (struct sockaddr *)sdl, ifp->if_type);
|
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sdl->sdl_alen = ifp->if_addrlen;
|
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bcopy(ln->ll_addr, &sdl->sdl_data, ifp->if_addrlen);
|
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LLE_RUNLOCK(ln);
|
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ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
|
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IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
|
|
} else
|
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LLE_RUNLOCK(ln);
|
|
|
|
return (ifa);
|
|
}
|
|
|
|
/*
|
|
* Output a Neighbor Solicitation Message. Caller specifies:
|
|
* - ICMP6 header source IP6 address
|
|
* - ND6 header target IP6 address
|
|
* - ND6 header source datalink address
|
|
*
|
|
* Based on RFC 2461
|
|
* Based on RFC 2462 (duplicate address detection)
|
|
*
|
|
* ln - for source address determination
|
|
* nonce - If non-NULL, NS is used for duplicate address detection and
|
|
* the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
|
|
*/
|
|
static void
|
|
nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
|
|
const struct in6_addr *daddr6, const struct in6_addr *taddr6,
|
|
uint8_t *nonce, u_int fibnum)
|
|
{
|
|
struct mbuf *m;
|
|
struct m_tag *mtag;
|
|
struct ip6_hdr *ip6;
|
|
struct nd_neighbor_solicit *nd_ns;
|
|
struct ip6_moptions im6o;
|
|
int icmp6len;
|
|
int maxlen;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(taddr6))
|
|
return;
|
|
|
|
/* estimate the size of message */
|
|
maxlen = sizeof(*ip6) + sizeof(*nd_ns);
|
|
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
|
|
KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
|
|
"%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
|
|
__func__, max_linkhdr, maxlen, MCLBYTES));
|
|
|
|
if (max_linkhdr + maxlen > MHLEN)
|
|
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
|
|
else
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return;
|
|
M_SETFIB(m, fibnum);
|
|
|
|
if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
|
|
m->m_flags |= M_MCAST;
|
|
im6o.im6o_multicast_ifp = ifp;
|
|
im6o.im6o_multicast_hlim = 255;
|
|
im6o.im6o_multicast_loop = 0;
|
|
}
|
|
|
|
icmp6len = sizeof(*nd_ns);
|
|
m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
|
|
m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
|
|
|
|
/* fill neighbor solicitation packet */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
/* ip6->ip6_plen will be set later */
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 255;
|
|
if (daddr6)
|
|
ip6->ip6_dst = *daddr6;
|
|
else {
|
|
ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
|
|
ip6->ip6_dst.s6_addr16[1] = 0;
|
|
ip6->ip6_dst.s6_addr32[1] = 0;
|
|
ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
|
|
ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
|
|
ip6->ip6_dst.s6_addr8[12] = 0xff;
|
|
if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
|
|
goto bad;
|
|
}
|
|
if (nonce == NULL) {
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
struct ifaddr *ifa = NULL;
|
|
|
|
/*
|
|
* RFC2461 7.2.2:
|
|
* "If the source address of the packet prompting the
|
|
* solicitation is the same as one of the addresses assigned
|
|
* to the outgoing interface, that address SHOULD be placed
|
|
* in the IP Source Address of the outgoing solicitation.
|
|
* Otherwise, any one of the addresses assigned to the
|
|
* interface should be used."
|
|
*
|
|
* We use the source address for the prompting packet
|
|
* (saddr6), if saddr6 belongs to the outgoing interface.
|
|
* Otherwise, we perform the source address selection as usual.
|
|
*/
|
|
if (saddr6 != NULL)
|
|
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
|
|
if (ifa == NULL) {
|
|
int error;
|
|
struct in6_addr dst6, src6;
|
|
uint32_t scopeid;
|
|
|
|
in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
|
|
error = in6_selectsrc_addr(fibnum, &dst6,
|
|
scopeid, ifp, &src6, NULL);
|
|
if (error) {
|
|
nd6log((LOG_DEBUG, "%s: source can't be "
|
|
"determined: dst=%s, error=%d\n", __func__,
|
|
ip6_sprintf(ip6buf, &dst6),
|
|
error));
|
|
goto bad;
|
|
}
|
|
ip6->ip6_src = src6;
|
|
} else
|
|
ip6->ip6_src = *saddr6;
|
|
|
|
if (ifp->if_carp != NULL) {
|
|
/*
|
|
* Check that selected source address belongs to
|
|
* CARP addresses.
|
|
*/
|
|
if (ifa == NULL)
|
|
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
|
|
&ip6->ip6_src);
|
|
/*
|
|
* Do not send NS for CARP address if we are not
|
|
* the CARP master.
|
|
*/
|
|
if (ifa != NULL && ifa->ifa_carp != NULL &&
|
|
!(*carp_master_p)(ifa)) {
|
|
log(LOG_DEBUG,
|
|
"nd6_ns_output: NS from BACKUP CARP address %s\n",
|
|
ip6_sprintf(ip6buf, &ip6->ip6_src));
|
|
ifa_free(ifa);
|
|
goto bad;
|
|
}
|
|
}
|
|
if (ifa != NULL)
|
|
ifa_free(ifa);
|
|
} else {
|
|
/*
|
|
* Source address for DAD packet must always be IPv6
|
|
* unspecified address. (0::0)
|
|
* We actually don't have to 0-clear the address (we did it
|
|
* above), but we do so here explicitly to make the intention
|
|
* clearer.
|
|
*/
|
|
bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
|
|
}
|
|
nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
|
|
nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
|
|
nd_ns->nd_ns_code = 0;
|
|
nd_ns->nd_ns_reserved = 0;
|
|
nd_ns->nd_ns_target = *taddr6;
|
|
in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
|
|
|
|
/*
|
|
* Add source link-layer address option.
|
|
*
|
|
* spec implementation
|
|
* --- ---
|
|
* DAD packet MUST NOT do not add the option
|
|
* there's no link layer address:
|
|
* impossible do not add the option
|
|
* there's link layer address:
|
|
* Multicast NS MUST add one add the option
|
|
* Unicast NS SHOULD add one add the option
|
|
*/
|
|
if (nonce == NULL) {
|
|
struct nd_opt_hdr *nd_opt;
|
|
char *mac;
|
|
int optlen;
|
|
|
|
mac = NULL;
|
|
if (ifp->if_carp)
|
|
mac = (*carp_macmatch6_p)(ifp, m, &ip6->ip6_src);
|
|
if (mac == NULL)
|
|
mac = nd6_ifptomac(ifp);
|
|
|
|
if (mac != NULL) {
|
|
nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
|
|
optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
|
|
/* 8 byte alignments... */
|
|
optlen = (optlen + 7) & ~7;
|
|
m->m_pkthdr.len += optlen;
|
|
m->m_len += optlen;
|
|
icmp6len += optlen;
|
|
bzero(nd_opt, optlen);
|
|
nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
|
|
nd_opt->nd_opt_len = optlen >> 3;
|
|
bcopy(mac, nd_opt + 1, ifp->if_addrlen);
|
|
}
|
|
}
|
|
/*
|
|
* Add a Nonce option (RFC 3971) to detect looped back NS messages.
|
|
* This behavior is documented as Enhanced Duplicate Address
|
|
* Detection in RFC 7527.
|
|
* net.inet6.ip6.dad_enhanced=0 disables this.
|
|
*/
|
|
if (V_dad_enhanced != 0 && nonce != NULL) {
|
|
int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
|
|
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
|
|
/* 8-byte alignment is required. */
|
|
optlen = (optlen + 7) & ~7;
|
|
|
|
m->m_pkthdr.len += optlen;
|
|
m->m_len += optlen;
|
|
icmp6len += optlen;
|
|
bzero((caddr_t)nd_opt, optlen);
|
|
nd_opt->nd_opt_type = ND_OPT_NONCE;
|
|
nd_opt->nd_opt_len = optlen >> 3;
|
|
bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
|
|
}
|
|
ip6->ip6_plen = htons((u_short)icmp6len);
|
|
nd_ns->nd_ns_cksum = 0;
|
|
nd_ns->nd_ns_cksum =
|
|
in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
|
|
|
|
if (send_sendso_input_hook != NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
|
|
sizeof(unsigned short), M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
*(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
|
|
ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
|
|
&im6o, NULL, NULL);
|
|
icmp6_ifstat_inc(ifp, ifs6_out_msg);
|
|
icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
|
|
ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
|
|
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
|
|
#ifndef BURN_BRIDGES
|
|
void
|
|
nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
|
|
const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
|
|
{
|
|
|
|
nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
|
|
}
|
|
#endif
|
|
/*
|
|
* Neighbor advertisement input handling.
|
|
*
|
|
* Based on RFC 2461
|
|
* Based on RFC 2462 (duplicate address detection)
|
|
*
|
|
* the following items are not implemented yet:
|
|
* - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
|
|
* - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
|
|
*/
|
|
void
|
|
nd6_na_input(struct mbuf *m, int off, int icmp6len)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ip6_hdr *ip6;
|
|
struct ifaddr *ifa;
|
|
struct llentry *ln;
|
|
struct mbuf *chain;
|
|
struct nd_neighbor_advert *nd_na;
|
|
struct in6_addr daddr6, taddr6;
|
|
union nd_opts ndopts;
|
|
u_char linkhdr[LLE_MAX_LINKHDR];
|
|
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
|
|
char *lladdr;
|
|
size_t linkhdrsize;
|
|
int flags, is_override, is_router, is_solicited;
|
|
int lladdr_off, lladdrlen, checklink;
|
|
bool flush_holdchain = false;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
chain = NULL;
|
|
ln = NULL;
|
|
checklink = 0;
|
|
|
|
/* RFC 6980: Nodes MUST silently ignore fragments */
|
|
if(m->m_flags & M_FRAGMENTED)
|
|
goto freeit;
|
|
|
|
ifp = m->m_pkthdr.rcvif;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (__predict_false(ip6->ip6_hlim != 255)) {
|
|
ICMP6STAT_INC(icp6s_invlhlim);
|
|
nd6log((LOG_ERR,
|
|
"nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
|
|
ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
|
|
ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
|
|
goto bad;
|
|
}
|
|
|
|
if (m->m_len < off + icmp6len) {
|
|
m = m_pullup(m, off + icmp6len);
|
|
if (m == NULL) {
|
|
IP6STAT_INC(ip6s_exthdrtoolong);
|
|
return;
|
|
}
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
|
|
|
|
flags = nd_na->nd_na_flags_reserved;
|
|
is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
|
|
is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
|
|
is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
|
|
|
|
taddr6 = nd_na->nd_na_target;
|
|
if (in6_setscope(&taddr6, ifp, NULL))
|
|
goto bad; /* XXX: impossible */
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_na_input: invalid target address %s\n",
|
|
ip6_sprintf(ip6bufs, &taddr6)));
|
|
goto bad;
|
|
}
|
|
|
|
daddr6 = ip6->ip6_dst;
|
|
if (IN6_IS_ADDR_MULTICAST(&daddr6))
|
|
if (is_solicited) {
|
|
nd6log((LOG_ERR,
|
|
"nd6_na_input: a solicited adv is multicasted\n"));
|
|
goto bad;
|
|
}
|
|
|
|
icmp6len -= sizeof(*nd_na);
|
|
nd6_option_init(nd_na + 1, icmp6len, &ndopts);
|
|
if (nd6_options(&ndopts) < 0) {
|
|
nd6log((LOG_INFO,
|
|
"nd6_na_input: invalid ND option, ignored\n"));
|
|
/* nd6_options have incremented stats */
|
|
goto freeit;
|
|
}
|
|
|
|
lladdr = NULL;
|
|
lladdrlen = 0;
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
|
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
|
}
|
|
|
|
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
|
|
if (ifa != NULL && ifa->ifa_carp != NULL) {
|
|
/*
|
|
* Silently ignore NAs for CARP addresses if we are not
|
|
* the CARP master.
|
|
*/
|
|
if (!(*carp_master_p)(ifa)) {
|
|
log(LOG_DEBUG,
|
|
"nd6_na_input: NA for BACKUP CARP address %s\n",
|
|
ip6_sprintf(ip6bufs, &taddr6));
|
|
ifa_free(ifa);
|
|
goto freeit;
|
|
}
|
|
}
|
|
/*
|
|
* Target address matches one of my interface address.
|
|
*
|
|
* If my address is tentative, this means that there's somebody
|
|
* already using the same address as mine. This indicates DAD failure.
|
|
* This is defined in RFC 2462.
|
|
*
|
|
* Otherwise, process as defined in RFC 2461.
|
|
*/
|
|
if (ifa
|
|
&& (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
|
|
nd6_dad_na_input(ifa);
|
|
ifa_free(ifa);
|
|
goto freeit;
|
|
}
|
|
|
|
/* Just for safety, maybe unnecessary. */
|
|
if (ifa) {
|
|
ifa_free(ifa);
|
|
log(LOG_ERR,
|
|
"nd6_na_input: duplicate IP6 address %s\n",
|
|
ip6_sprintf(ip6bufs, &taddr6));
|
|
goto freeit;
|
|
}
|
|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
|
nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
|
|
"(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
|
|
ifp->if_addrlen, lladdrlen - 2));
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* If no neighbor cache entry is found, NA SHOULD silently be
|
|
* discarded.
|
|
*/
|
|
ln = nd6_lookup(&taddr6, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
|
|
if (ln == NULL) {
|
|
goto freeit;
|
|
}
|
|
|
|
/*
|
|
* Do not try to override static entry.
|
|
*/
|
|
if (ln->la_flags & LLE_STATIC)
|
|
goto freeit;
|
|
|
|
if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
|
|
/*
|
|
* If the link-layer has address, and no lladdr option came,
|
|
* discard the packet.
|
|
*/
|
|
if (ifp->if_addrlen && lladdr == NULL) {
|
|
goto freeit;
|
|
}
|
|
|
|
/*
|
|
* Record link-layer address, and update the state.
|
|
*/
|
|
if (!nd6_try_set_entry_addr(ifp, ln, lladdr))
|
|
goto freeit;
|
|
|
|
flush_holdchain = true;
|
|
if (is_solicited)
|
|
nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
|
|
else
|
|
nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
|
|
EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
|
|
if ((ln->ln_router = is_router) != 0) {
|
|
/*
|
|
* This means a router's state has changed from
|
|
* non-reachable to probably reachable, and might
|
|
* affect the status of associated prefixes..
|
|
*/
|
|
checklink = 1;
|
|
}
|
|
} else {
|
|
int llchange;
|
|
|
|
/*
|
|
* Check if the link-layer address has changed or not.
|
|
*/
|
|
if (lladdr == NULL)
|
|
llchange = 0;
|
|
else {
|
|
if (ln->la_flags & LLE_VALID) {
|
|
if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
|
|
llchange = 1;
|
|
else
|
|
llchange = 0;
|
|
} else
|
|
llchange = 1;
|
|
}
|
|
|
|
/*
|
|
* This is VERY complex. Look at it with care.
|
|
*
|
|
* override solicit lladdr llchange action
|
|
* (L: record lladdr)
|
|
*
|
|
* 0 0 n -- (2c)
|
|
* 0 0 y n (2b) L
|
|
* 0 0 y y (1) REACHABLE->STALE
|
|
* 0 1 n -- (2c) *->REACHABLE
|
|
* 0 1 y n (2b) L *->REACHABLE
|
|
* 0 1 y y (1) REACHABLE->STALE
|
|
* 1 0 n -- (2a)
|
|
* 1 0 y n (2a) L
|
|
* 1 0 y y (2a) L *->STALE
|
|
* 1 1 n -- (2a) *->REACHABLE
|
|
* 1 1 y n (2a) L *->REACHABLE
|
|
* 1 1 y y (2a) L *->REACHABLE
|
|
*/
|
|
if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
|
|
/*
|
|
* If state is REACHABLE, make it STALE.
|
|
* no other updates should be done.
|
|
*/
|
|
if (ln->ln_state == ND6_LLINFO_REACHABLE)
|
|
nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
|
|
goto freeit;
|
|
} else if (is_override /* (2a) */
|
|
|| (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
|
|
|| lladdr == NULL) { /* (2c) */
|
|
/*
|
|
* Update link-local address, if any.
|
|
*/
|
|
if (lladdr != NULL) {
|
|
linkhdrsize = sizeof(linkhdr);
|
|
if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
|
|
linkhdr, &linkhdrsize, &lladdr_off) != 0)
|
|
goto freeit;
|
|
if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
|
|
linkhdrsize, lladdr_off) == 0)
|
|
goto freeit;
|
|
EVENTHANDLER_INVOKE(lle_event, ln,
|
|
LLENTRY_RESOLVED);
|
|
}
|
|
|
|
/*
|
|
* If solicited, make the state REACHABLE.
|
|
* If not solicited and the link-layer address was
|
|
* changed, make it STALE.
|
|
*/
|
|
if (is_solicited)
|
|
nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
|
|
else {
|
|
if (lladdr != NULL && llchange)
|
|
nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
|
|
}
|
|
}
|
|
|
|
if (ln->ln_router && !is_router) {
|
|
/*
|
|
* The peer dropped the router flag.
|
|
* Remove the sender from the Default Router List and
|
|
* update the Destination Cache entries.
|
|
*/
|
|
struct ifnet *nd6_ifp;
|
|
|
|
nd6_ifp = lltable_get_ifp(ln->lle_tbl);
|
|
if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
|
|
(ND_IFINFO(nd6_ifp)->flags &
|
|
ND6_IFF_ACCEPT_RTADV) != 0)
|
|
/*
|
|
* Even if the neighbor is not in the default
|
|
* router list, the neighbor may be used as a
|
|
* next hop for some destinations (e.g. redirect
|
|
* case). So we must call rt6_flush explicitly.
|
|
*/
|
|
rt6_flush(&ip6->ip6_src, ifp);
|
|
}
|
|
ln->ln_router = is_router;
|
|
}
|
|
/* XXX - QL
|
|
* Does this matter?
|
|
* rt->rt_flags &= ~RTF_REJECT;
|
|
*/
|
|
ln->la_asked = 0;
|
|
if (ln->la_hold != NULL)
|
|
chain = nd6_grab_holdchain(ln);
|
|
freeit:
|
|
if (ln != NULL)
|
|
LLE_WUNLOCK(ln);
|
|
|
|
if (chain != NULL)
|
|
nd6_flush_holdchain(ifp, ln, chain);
|
|
if (flush_holdchain)
|
|
nd6_flush_children_holdchain(ifp, ln);
|
|
|
|
if (checklink)
|
|
pfxlist_onlink_check();
|
|
|
|
m_freem(m);
|
|
return;
|
|
|
|
bad:
|
|
if (ln != NULL)
|
|
LLE_WUNLOCK(ln);
|
|
|
|
ICMP6STAT_INC(icp6s_badna);
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Neighbor advertisement output handling.
|
|
*
|
|
* Based on RFC 2461
|
|
*
|
|
* the following items are not implemented yet:
|
|
* - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
|
|
* - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
|
|
*
|
|
* tlladdr - 1 if include target link-layer address
|
|
* sdl0 - sockaddr_dl (= proxy NA) or NULL
|
|
*/
|
|
static void
|
|
nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
|
|
const struct in6_addr *taddr6, u_long flags, int tlladdr,
|
|
struct sockaddr *sdl0, u_int fibnum)
|
|
{
|
|
struct mbuf *m;
|
|
struct m_tag *mtag;
|
|
struct ip6_hdr *ip6;
|
|
struct nd_neighbor_advert *nd_na;
|
|
struct ip6_moptions im6o;
|
|
struct in6_addr daddr6, dst6, src6;
|
|
uint32_t scopeid;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
int icmp6len, maxlen, error;
|
|
caddr_t mac = NULL;
|
|
|
|
daddr6 = *daddr6_0; /* make a local copy for modification */
|
|
|
|
/* estimate the size of message */
|
|
maxlen = sizeof(*ip6) + sizeof(*nd_na);
|
|
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
|
|
KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
|
|
"%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
|
|
__func__, max_linkhdr, maxlen, MCLBYTES));
|
|
|
|
if (max_linkhdr + maxlen > MHLEN)
|
|
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
|
|
else
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return;
|
|
M_SETFIB(m, fibnum);
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
|
|
m->m_flags |= M_MCAST;
|
|
im6o.im6o_multicast_ifp = ifp;
|
|
im6o.im6o_multicast_hlim = 255;
|
|
im6o.im6o_multicast_loop = 0;
|
|
}
|
|
|
|
icmp6len = sizeof(*nd_na);
|
|
m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
|
|
m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
|
|
|
|
/* fill neighbor advertisement packet */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
|
|
ip6->ip6_vfc |= IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 255;
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
|
|
/* reply to DAD */
|
|
daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
|
|
daddr6.s6_addr16[1] = 0;
|
|
daddr6.s6_addr32[1] = 0;
|
|
daddr6.s6_addr32[2] = 0;
|
|
daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
|
|
if (in6_setscope(&daddr6, ifp, NULL))
|
|
goto bad;
|
|
|
|
flags &= ~ND_NA_FLAG_SOLICITED;
|
|
}
|
|
ip6->ip6_dst = daddr6;
|
|
|
|
/*
|
|
* Select a source whose scope is the same as that of the dest.
|
|
*/
|
|
in6_splitscope(&daddr6, &dst6, &scopeid);
|
|
error = in6_selectsrc_addr(fibnum, &dst6,
|
|
scopeid, ifp, &src6, NULL);
|
|
if (error) {
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
|
|
"determined: dst=%s, error=%d\n",
|
|
ip6_sprintf(ip6buf, &daddr6), error));
|
|
goto bad;
|
|
}
|
|
ip6->ip6_src = src6;
|
|
nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
|
|
nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
|
|
nd_na->nd_na_code = 0;
|
|
nd_na->nd_na_target = *taddr6;
|
|
in6_clearscope(&nd_na->nd_na_target); /* XXX */
|
|
|
|
/*
|
|
* "tlladdr" indicates NS's condition for adding tlladdr or not.
|
|
* see nd6_ns_input() for details.
|
|
* Basically, if NS packet is sent to unicast/anycast addr,
|
|
* target lladdr option SHOULD NOT be included.
|
|
*/
|
|
if (tlladdr) {
|
|
/*
|
|
* sdl0 != NULL indicates proxy NA. If we do proxy, use
|
|
* lladdr in sdl0. If we are not proxying (sending NA for
|
|
* my address) use lladdr configured for the interface.
|
|
*/
|
|
if (sdl0 == NULL) {
|
|
if (ifp->if_carp)
|
|
mac = (*carp_macmatch6_p)(ifp, m, taddr6);
|
|
if (mac == NULL)
|
|
mac = nd6_ifptomac(ifp);
|
|
} else if (sdl0->sa_family == AF_LINK) {
|
|
struct sockaddr_dl *sdl;
|
|
sdl = (struct sockaddr_dl *)sdl0;
|
|
if (sdl->sdl_alen == ifp->if_addrlen)
|
|
mac = LLADDR(sdl);
|
|
}
|
|
}
|
|
if (tlladdr && mac) {
|
|
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
|
|
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
|
|
|
|
/* roundup to 8 bytes alignment! */
|
|
optlen = (optlen + 7) & ~7;
|
|
|
|
m->m_pkthdr.len += optlen;
|
|
m->m_len += optlen;
|
|
icmp6len += optlen;
|
|
bzero((caddr_t)nd_opt, optlen);
|
|
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
|
|
nd_opt->nd_opt_len = optlen >> 3;
|
|
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
|
|
} else
|
|
flags &= ~ND_NA_FLAG_OVERRIDE;
|
|
|
|
ip6->ip6_plen = htons((u_short)icmp6len);
|
|
nd_na->nd_na_flags_reserved = flags;
|
|
nd_na->nd_na_cksum = 0;
|
|
nd_na->nd_na_cksum =
|
|
in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
|
|
|
|
if (send_sendso_input_hook != NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
|
|
sizeof(unsigned short), M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
*(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
|
|
ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
|
|
icmp6_ifstat_inc(ifp, ifs6_out_msg);
|
|
icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
|
|
ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
|
|
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
|
|
#ifndef BURN_BRIDGES
|
|
void
|
|
nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
|
|
const struct in6_addr *taddr6, u_long flags, int tlladdr,
|
|
struct sockaddr *sdl0)
|
|
{
|
|
|
|
nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
|
|
RT_DEFAULT_FIB);
|
|
}
|
|
#endif
|
|
|
|
caddr_t
|
|
nd6_ifptomac(struct ifnet *ifp)
|
|
{
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_IEEE1394:
|
|
case IFT_L2VLAN:
|
|
case IFT_INFINIBAND:
|
|
case IFT_BRIDGE:
|
|
return IF_LLADDR(ifp);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
struct dadq {
|
|
TAILQ_ENTRY(dadq) dad_list;
|
|
struct ifaddr *dad_ifa;
|
|
int dad_count; /* max NS to send */
|
|
int dad_ns_tcount; /* # of trials to send NS */
|
|
int dad_ns_ocount; /* NS sent so far */
|
|
int dad_ns_icount;
|
|
int dad_na_icount;
|
|
int dad_ns_lcount; /* looped back NS */
|
|
int dad_loopbackprobe; /* probing state for loopback detection */
|
|
struct callout dad_timer_ch;
|
|
struct vnet *dad_vnet;
|
|
u_int dad_refcnt;
|
|
#define ND_OPT_NONCE_LEN32 \
|
|
((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
|
|
uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
|
|
bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
|
|
};
|
|
|
|
VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
|
|
VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
|
|
#define V_dadq VNET(dadq)
|
|
#define V_dad_rwlock VNET(dad_rwlock)
|
|
|
|
#define DADQ_LOCKPTR() (&V_dad_rwlock)
|
|
#define DADQ_LOCK_INIT() rw_init(DADQ_LOCKPTR(), "nd6 DAD queue")
|
|
#define DADQ_RLOCK() rw_rlock(DADQ_LOCKPTR())
|
|
#define DADQ_RUNLOCK() rw_runlock(DADQ_LOCKPTR())
|
|
#define DADQ_WLOCK() rw_wlock(DADQ_LOCKPTR())
|
|
#define DADQ_WUNLOCK() rw_wunlock(DADQ_LOCKPTR())
|
|
|
|
#define DADQ_LOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_LOCKED);
|
|
#define DADQ_RLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_RLOCKED);
|
|
#define DADQ_WLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_WLOCKED);
|
|
|
|
static void
|
|
nd6_dad_add(struct dadq *dp)
|
|
{
|
|
DADQ_WLOCK_ASSERT();
|
|
|
|
TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
|
|
dp->dad_ondadq = true;
|
|
}
|
|
|
|
static void
|
|
nd6_dad_del(struct dadq *dp)
|
|
{
|
|
DADQ_WLOCK_ASSERT();
|
|
|
|
if (dp->dad_ondadq) {
|
|
/*
|
|
* Remove dp from the dadq and release the dadq's
|
|
* reference.
|
|
*/
|
|
TAILQ_REMOVE(&V_dadq, dp, dad_list);
|
|
dp->dad_ondadq = false;
|
|
nd6_dad_rele(dp);
|
|
}
|
|
}
|
|
|
|
static struct dadq *
|
|
nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
DADQ_LOCK_ASSERT();
|
|
|
|
TAILQ_FOREACH(dp, &V_dadq, dad_list) {
|
|
if (dp->dad_ifa != ifa)
|
|
continue;
|
|
|
|
/*
|
|
* Skip if the nonce matches the received one.
|
|
* +2 in the length is required because of type and
|
|
* length fields are included in a header.
|
|
*/
|
|
if (n != NULL &&
|
|
n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
|
|
memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
|
|
ND_OPT_NONCE_LEN) == 0) {
|
|
dp->dad_ns_lcount++;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (dp);
|
|
}
|
|
|
|
static void
|
|
nd6_dad_starttimer(struct dadq *dp, int ticks)
|
|
{
|
|
DADQ_WLOCK_ASSERT();
|
|
|
|
callout_reset(&dp->dad_timer_ch, ticks, nd6_dad_timer, dp);
|
|
}
|
|
|
|
static void
|
|
nd6_dad_stoptimer(struct dadq *dp)
|
|
{
|
|
callout_drain(&dp->dad_timer_ch);
|
|
}
|
|
|
|
static void
|
|
nd6_dad_rele(struct dadq *dp)
|
|
{
|
|
if (refcount_release(&dp->dad_refcnt)) {
|
|
KASSERT(!dp->dad_ondadq, ("dp %p still on DAD queue", dp));
|
|
ifa_free(dp->dad_ifa);
|
|
free(dp, M_IP6NDP);
|
|
}
|
|
}
|
|
|
|
void
|
|
nd6_dad_init(void)
|
|
{
|
|
DADQ_LOCK_INIT();
|
|
TAILQ_INIT(&V_dadq);
|
|
}
|
|
|
|
/*
|
|
* Start Duplicate Address Detection (DAD) for specified interface address.
|
|
*/
|
|
void
|
|
nd6_dad_start(struct ifaddr *ifa, int delay)
|
|
{
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
struct dadq *dp;
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
|
|
KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
|
|
("starting DAD on non-tentative address %p", ifa));
|
|
|
|
/*
|
|
* If we don't need DAD, don't do it.
|
|
* There are several cases:
|
|
* - DAD is disabled globally or on the interface
|
|
* - the interface address is anycast
|
|
*/
|
|
if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
|
|
V_ip6_dad_count == 0 ||
|
|
(ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
return;
|
|
}
|
|
if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
|
|
(ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
|
|
(ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
|
|
return;
|
|
|
|
DADQ_WLOCK();
|
|
if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
|
|
/*
|
|
* DAD is already in progress. Let the existing entry
|
|
* finish it.
|
|
*/
|
|
DADQ_WUNLOCK();
|
|
return;
|
|
}
|
|
|
|
dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
|
|
if (dp == NULL) {
|
|
log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
return;
|
|
}
|
|
callout_init_rw(&dp->dad_timer_ch, DADQ_LOCKPTR(),
|
|
CALLOUT_RETURNUNLOCKED);
|
|
#ifdef VIMAGE
|
|
dp->dad_vnet = curvnet;
|
|
#endif
|
|
nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
|
|
|
|
/*
|
|
* Send NS packet for DAD, ip6_dad_count times.
|
|
* Note that we must delay the first transmission, if this is the
|
|
* first packet to be sent from the interface after interface
|
|
* (re)initialization.
|
|
*/
|
|
dp->dad_ifa = ifa;
|
|
ifa_ref(dp->dad_ifa);
|
|
dp->dad_count = V_ip6_dad_count;
|
|
dp->dad_ns_icount = dp->dad_na_icount = 0;
|
|
dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
|
|
dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
|
|
|
|
/* Add this to the dadq and add a reference for the dadq. */
|
|
refcount_init(&dp->dad_refcnt, 1);
|
|
nd6_dad_add(dp);
|
|
nd6_dad_starttimer(dp, delay);
|
|
DADQ_WUNLOCK();
|
|
}
|
|
|
|
/*
|
|
* terminate DAD unconditionally. used for address removals.
|
|
*/
|
|
void
|
|
nd6_dad_stop(struct ifaddr *ifa)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
DADQ_WLOCK();
|
|
dp = nd6_dad_find(ifa, NULL);
|
|
if (dp == NULL) {
|
|
DADQ_WUNLOCK();
|
|
/* DAD wasn't started yet */
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Acquire a temporary reference so that we can safely stop the callout.
|
|
*/
|
|
(void)refcount_acquire(&dp->dad_refcnt);
|
|
nd6_dad_del(dp);
|
|
DADQ_WUNLOCK();
|
|
|
|
nd6_dad_stoptimer(dp);
|
|
nd6_dad_rele(dp);
|
|
}
|
|
|
|
static void
|
|
nd6_dad_timer(void *arg)
|
|
{
|
|
struct dadq *dp = arg;
|
|
struct ifaddr *ifa = dp->dad_ifa;
|
|
struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
struct epoch_tracker et;
|
|
|
|
CURVNET_SET(dp->dad_vnet);
|
|
KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
|
|
|
|
NET_EPOCH_ENTER(et);
|
|
if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
|
|
/* Do not need DAD for ifdisabled interface. */
|
|
log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
|
|
"ND6_IFF_IFDISABLED.\n", ifp->if_xname);
|
|
goto err;
|
|
}
|
|
if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
|
|
log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
goto err;
|
|
}
|
|
if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
|
|
log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
goto err;
|
|
}
|
|
|
|
/* Stop DAD if the interface is down even after dad_maxtry attempts. */
|
|
if ((dp->dad_ns_tcount > V_dad_maxtry) &&
|
|
(((ifp->if_flags & IFF_UP) == 0) ||
|
|
((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
|
|
nd6log((LOG_INFO, "%s: could not run DAD "
|
|
"because the interface was down or not running.\n",
|
|
if_name(ifa->ifa_ifp)));
|
|
goto err;
|
|
}
|
|
|
|
/* Need more checks? */
|
|
if (dp->dad_ns_ocount < dp->dad_count) {
|
|
/*
|
|
* We have more NS to go. Send NS packet for DAD.
|
|
*/
|
|
nd6_dad_starttimer(dp,
|
|
(long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
|
|
nd6_dad_ns_output(dp);
|
|
goto done;
|
|
} else {
|
|
/*
|
|
* We have transmitted sufficient number of DAD packets.
|
|
* See what we've got.
|
|
*/
|
|
if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0) {
|
|
/* We've seen NS or NA, means DAD has failed. */
|
|
nd6_dad_duplicated(ifa, dp);
|
|
} else if (V_dad_enhanced != 0 &&
|
|
dp->dad_ns_lcount > 0 &&
|
|
dp->dad_ns_lcount > dp->dad_loopbackprobe) {
|
|
/*
|
|
* Sec. 4.1 in RFC 7527 requires transmission of
|
|
* additional probes until the loopback condition
|
|
* becomes clear when a looped back probe is detected.
|
|
*/
|
|
log(LOG_ERR, "%s: a looped back NS message is "
|
|
"detected during DAD for %s. "
|
|
"Another DAD probes are being sent.\n",
|
|
if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(ip6buf, IFA_IN6(ifa)));
|
|
dp->dad_loopbackprobe = dp->dad_ns_lcount;
|
|
/*
|
|
* Send an NS immediately and increase dad_count by
|
|
* V_nd6_mmaxtries - 1.
|
|
*/
|
|
dp->dad_count =
|
|
dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
|
|
nd6_dad_starttimer(dp,
|
|
(long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
|
|
nd6_dad_ns_output(dp);
|
|
goto done;
|
|
} else {
|
|
/*
|
|
* We are done with DAD. No NA came, no NS came.
|
|
* No duplicate address found. Check IFDISABLED flag
|
|
* again in case that it is changed between the
|
|
* beginning of this function and here.
|
|
*/
|
|
if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
|
|
nd6log((LOG_DEBUG,
|
|
"%s: DAD complete for %s - no duplicates found\n",
|
|
if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
|
|
if (dp->dad_ns_lcount > 0)
|
|
log(LOG_ERR, "%s: DAD completed while "
|
|
"a looped back NS message is detected "
|
|
"during DAD for %s.\n",
|
|
if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(ip6buf, IFA_IN6(ifa)));
|
|
}
|
|
}
|
|
err:
|
|
nd6_dad_del(dp);
|
|
DADQ_WUNLOCK();
|
|
done:
|
|
NET_EPOCH_EXIT(et);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
static void
|
|
nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
|
|
{
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
struct ifnet *ifp;
|
|
char ip6buf[INET6_ADDRSTRLEN];
|
|
|
|
log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
|
|
"NS in/out/loopback=%d/%d/%d, NA in=%d\n",
|
|
if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
|
|
dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
|
|
dp->dad_na_icount);
|
|
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
ia->ia6_flags |= IN6_IFF_DUPLICATED;
|
|
|
|
ifp = ifa->ifa_ifp;
|
|
log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
|
|
if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
|
|
log(LOG_ERR, "%s: manual intervention required\n",
|
|
if_name(ifp));
|
|
|
|
/*
|
|
* If the address is a link-local address formed from an interface
|
|
* identifier based on the hardware address which is supposed to be
|
|
* uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
|
|
* operation on the interface SHOULD be disabled.
|
|
* [RFC 4862, Section 5.4.5]
|
|
*/
|
|
if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
|
|
struct in6_addr in6;
|
|
|
|
/*
|
|
* To avoid over-reaction, we only apply this logic when we are
|
|
* very sure that hardware addresses are supposed to be unique.
|
|
*/
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER:
|
|
case IFT_ATM:
|
|
case IFT_IEEE1394:
|
|
case IFT_INFINIBAND:
|
|
in6 = ia->ia_addr.sin6_addr;
|
|
if (in6_get_hw_ifid(ifp, &in6) == 0 &&
|
|
IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
|
|
ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
|
|
log(LOG_ERR, "%s: possible hardware address "
|
|
"duplication detected, disable IPv6\n",
|
|
if_name(ifp));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Transmit a neighbour solicitation for the purpose of DAD. Returns with the
|
|
* DAD queue unlocked.
|
|
*/
|
|
static void
|
|
nd6_dad_ns_output(struct dadq *dp)
|
|
{
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
|
|
struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
|
|
int i;
|
|
|
|
DADQ_WLOCK_ASSERT();
|
|
|
|
dp->dad_ns_tcount++;
|
|
if ((ifp->if_flags & IFF_UP) == 0) {
|
|
DADQ_WUNLOCK();
|
|
return;
|
|
}
|
|
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
|
|
DADQ_WUNLOCK();
|
|
return;
|
|
}
|
|
|
|
dp->dad_ns_ocount++;
|
|
if (V_dad_enhanced != 0) {
|
|
for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
|
|
dp->dad_nonce[i] = arc4random();
|
|
/*
|
|
* XXXHRS: Note that in the case that
|
|
* DupAddrDetectTransmits > 1, multiple NS messages with
|
|
* different nonces can be looped back in an unexpected
|
|
* order. The current implementation recognizes only
|
|
* the latest nonce on the sender side. Practically it
|
|
* should work well in almost all cases.
|
|
*/
|
|
}
|
|
DADQ_WUNLOCK();
|
|
nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
|
|
(uint8_t *)&dp->dad_nonce[0]);
|
|
}
|
|
|
|
static void
|
|
nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
if (ifa == NULL)
|
|
panic("ifa == NULL in nd6_dad_ns_input");
|
|
|
|
/* Ignore Nonce option when Enhanced DAD is disabled. */
|
|
if (V_dad_enhanced == 0)
|
|
ndopt_nonce = NULL;
|
|
DADQ_RLOCK();
|
|
dp = nd6_dad_find(ifa, ndopt_nonce);
|
|
if (dp != NULL)
|
|
dp->dad_ns_icount++;
|
|
DADQ_RUNLOCK();
|
|
}
|
|
|
|
static void
|
|
nd6_dad_na_input(struct ifaddr *ifa)
|
|
{
|
|
struct dadq *dp;
|
|
|
|
if (ifa == NULL)
|
|
panic("ifa == NULL in nd6_dad_na_input");
|
|
|
|
DADQ_RLOCK();
|
|
dp = nd6_dad_find(ifa, NULL);
|
|
if (dp != NULL)
|
|
dp->dad_na_icount++;
|
|
DADQ_RUNLOCK();
|
|
}
|