ea861f0183
due to massive changes in KAME side. - IPv6 output goes through nd6_output - faith can capture IPv4 packets as well - you can run IPv4-to-IPv6 translator using heavily modified DNS servers - per-interface statistics (required for IPv6 MIB) - interface autoconfig is revisited - udp input handling has a big change for mapped address support. - introduce in4_cksum() for non-overwriting checksumming - introduce m_pulldown() - neighbor discovery cleanups/improvements - netinet/in.h strictly conforms to RFC2553 (no extra defs visible to userland) - IFA_STATS is fixed a bit (not tested) - and more more more. TODO: - cleanup os-independency #ifdef - avoid rcvif dual use (for IPsec) to help ifdetach (sorry for jumbo commit, I can't separate this any more...)
1262 lines
32 KiB
C
1262 lines
32 KiB
C
/* $NetBSD: nd6_nbr.c,v 1.9 1999/12/13 15:17:23 itojun Exp $ */
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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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#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
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#include "opt_inet.h"
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#ifdef __NetBSD__ /*XXX*/
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#include "opt_ipsec.h"
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#endif
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#endif
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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/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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#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
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#include <sys/ioctl.h>
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#endif
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#include <sys/syslog.h>
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#include <sys/queue.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/route.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/icmp6.h>
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#include <net/net_osdep.h>
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#define SDL(s) ((struct sockaddr_dl *)s)
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#if 0
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extern struct timeval time;
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#endif
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struct dadq;
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static struct dadq *nd6_dad_find __P((struct ifaddr *));
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static void nd6_dad_timer __P((struct ifaddr *));
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static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *));
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static void nd6_dad_ns_input __P((struct ifaddr *));
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static void nd6_dad_na_input __P((struct ifaddr *));
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static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
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static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
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/*
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* Input an Neighbor Solicitation Message.
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*
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* Based on RFC 2461
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* Based on RFC 2462 (duplicated address detection)
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*
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* XXX proxy advertisement
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*/
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void
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nd6_ns_input(m, off, icmp6len)
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struct mbuf *m;
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int off, icmp6len;
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{
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struct ifnet *ifp = m->m_pkthdr.rcvif;
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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struct nd_neighbor_solicit *nd_ns
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= (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
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struct in6_addr saddr6 = ip6->ip6_src;
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struct in6_addr daddr6 = ip6->ip6_dst;
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struct in6_addr taddr6 = nd_ns->nd_ns_target;
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struct in6_addr myaddr6;
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char *lladdr = NULL;
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struct ifaddr *ifa;
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int lladdrlen = 0;
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int anycast = 0, proxy = 0, tentative = 0;
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int tlladdr;
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union nd_opts ndopts;
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if (ip6->ip6_hlim != 255) {
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log(LOG_ERR,
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"nd6_ns_input: invalid hlim %d\n", ip6->ip6_hlim);
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return;
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}
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
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/* dst has to be 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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log(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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}
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if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
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log(LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n");
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goto bad;
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}
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if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
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taddr6.s6_addr16[1] = htons(ifp->if_index);
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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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log(LOG_INFO, "nd6_ns_input: invalid ND option, ignored\n");
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goto bad;
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}
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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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log(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 0 /* too much! */
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ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
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if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
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tlladdr = 0;
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else
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#endif
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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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ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
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/* (2) check. */
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if (!ifa && nd6_proxyall) {
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struct rtentry *rt;
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struct sockaddr_in6 tsin6;
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bzero(&tsin6, sizeof tsin6);
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tsin6.sin6_len = sizeof(struct sockaddr_in6);
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tsin6.sin6_family = AF_INET6;
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tsin6.sin6_addr = taddr6;
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rt = rtalloc1((struct sockaddr *)&tsin6, 0
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#ifdef __FreeBSD__
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, 0
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#endif /* __FreeBSD__ */
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);
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if (rt && rt->rt_ifp != ifp) {
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/*
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* search link local addr for ifp, and use it for
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* proxy NA.
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*/
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ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp);
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if (ifa)
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proxy = 1;
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}
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rtfree(rt);
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}
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if (!ifa) {
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/*
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* We've got a 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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return;
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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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return;
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if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
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log(LOG_INFO,
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"nd6_ns_input: lladdrlen mismatch for %s "
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"(if %d, NS packet %d)\n",
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ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2);
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}
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if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
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log(LOG_INFO,
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"nd6_ns_input: duplicate IP6 address %s\n",
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ip6_sprintf(&saddr6));
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return;
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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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* duplicated 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);
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return;
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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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saddr6 = in6addr_linklocal_allnodes;
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saddr6.s6_addr16[1] = htons(ifp->if_index);
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nd6_na_output(ifp, &saddr6, &taddr6,
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((anycast || proxy || !tlladdr)
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? 0 : ND_NA_FLAG_OVERRIDE)
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| (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
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tlladdr);
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return;
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}
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nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
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nd6_na_output(ifp, &saddr6, &taddr6,
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((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE)
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| (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
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| ND_NA_FLAG_SOLICITED,
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tlladdr);
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return;
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bad:
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log(LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6));
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log(LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6));
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log(LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6));
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return;
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}
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|
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/*
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* Output an Neighbor Solicitation Message. Caller specifies:
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* - ICMP6 header source IP6 address
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* - ND6 header target IP6 address
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* - ND6 header source datalink address
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*
|
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* Based on RFC 2461
|
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* Based on RFC 2462 (duplicated address detection)
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*/
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void
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nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
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struct ifnet *ifp;
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struct in6_addr *daddr6, *taddr6;
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struct llinfo_nd6 *ln; /* for source address determination */
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int dad; /* duplicated address detection */
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{
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struct mbuf *m;
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struct ip6_hdr *ip6;
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struct nd_neighbor_solicit *nd_ns;
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struct in6_ifaddr *ia = NULL;
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struct ip6_moptions im6o;
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int icmp6len;
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caddr_t mac;
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struct ifnet *outif = NULL;
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if (IN6_IS_ADDR_MULTICAST(taddr6))
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return;
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|
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if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
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return;
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|
|
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if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
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m->m_flags |= M_MCAST;
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im6o.im6o_multicast_ifp = ifp;
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im6o.im6o_multicast_hlim = 255;
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im6o.im6o_multicast_loop = 0;
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}
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icmp6len = sizeof(*nd_ns);
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m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
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MH_ALIGN(m, m->m_len + 16); /* 1+1+6 is enought. but just in case */
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|
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/* fill neighbor solicitation packet */
|
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = 0;
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ip6->ip6_vfc = IPV6_VERSION;
|
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/* ip6->ip6_plen will be set later */
|
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ip6->ip6_nxt = IPPROTO_ICMPV6;
|
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ip6->ip6_hlim = 255;
|
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if (daddr6)
|
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ip6->ip6_dst = *daddr6;
|
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else {
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ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
|
|
ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
|
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ip6->ip6_dst.s6_addr32[1] = 0;
|
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ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
|
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ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
|
|
ip6->ip6_dst.s6_addr8[12] = 0xff;
|
|
}
|
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if (!dad) {
|
|
#if 0 /* KAME way, exact address scope match */
|
|
/*
|
|
* Select a source whose scope is the same as that of the dest.
|
|
* Typically, the dest is link-local solicitation multicast
|
|
* (i.e. neighbor discovery) or link-local/global unicast
|
|
* (i.e. neighbor un-reachability detection).
|
|
*/
|
|
ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
|
|
if (ia == NULL) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
ip6->ip6_src = ia->ia_addr.sin6_addr;
|
|
#else /* spec-wise correct */
|
|
/*
|
|
* 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 is given from the caller (by giving "ln"), and
|
|
* - saddr6 belongs to the outgoing interface.
|
|
* Otherwise, we perform a scope-wise match.
|
|
*/
|
|
struct ip6_hdr *hip6; /*hold ip6*/
|
|
struct in6_addr *saddr6;
|
|
|
|
if (ln && ln->ln_hold) {
|
|
hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
|
|
/* XXX pullup? */
|
|
if (sizeof(*hip6) < ln->ln_hold->m_len)
|
|
saddr6 = &hip6->ip6_src;
|
|
else
|
|
saddr6 = NULL;
|
|
} else
|
|
saddr6 = NULL;
|
|
if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
|
|
bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
|
|
else {
|
|
ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
|
|
if (ia == NULL) {
|
|
m_freem(m); /*XXX*/
|
|
return;
|
|
}
|
|
ip6->ip6_src = ia->ia_addr.sin6_addr;
|
|
}
|
|
#endif
|
|
} else {
|
|
/*
|
|
* Source address for DAD packet must always be IPv6
|
|
* unspecified address. (0::0)
|
|
*/
|
|
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;
|
|
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target))
|
|
nd_ns->nd_ns_target.s6_addr16[1] = 0;
|
|
|
|
/*
|
|
* 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 (!dad && (mac = nd6_ifptomac(ifp))) {
|
|
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
|
|
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
|
|
/* 8 byte alignments... */
|
|
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_SOURCE_LINKADDR;
|
|
nd_opt->nd_opt_len = optlen >> 3;
|
|
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
|
|
}
|
|
|
|
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);
|
|
|
|
#ifdef IPSEC
|
|
#ifndef __OpenBSD__ /*KAME IPSEC*/
|
|
m->m_pkthdr.rcvif = NULL;
|
|
#endif
|
|
#endif /*IPSEC*/
|
|
ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif);
|
|
if (outif) {
|
|
icmp6_ifstat_inc(outif, ifs6_out_msg);
|
|
icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
|
|
}
|
|
icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
|
|
}
|
|
|
|
/*
|
|
* Neighbor advertisement input handling.
|
|
*
|
|
* Based on RFC 2461
|
|
* Based on RFC 2462 (duplicated address detection)
|
|
*/
|
|
void
|
|
nd6_na_input(m, off, icmp6len)
|
|
struct mbuf *m;
|
|
int off, icmp6len;
|
|
{
|
|
struct ifnet *ifp = m->m_pkthdr.rcvif;
|
|
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
|
|
struct nd_neighbor_advert *nd_na
|
|
= (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
|
|
#if 0
|
|
struct in6_addr saddr6 = ip6->ip6_src;
|
|
#endif
|
|
struct in6_addr daddr6 = ip6->ip6_dst;
|
|
struct in6_addr taddr6 = nd_na->nd_na_target;
|
|
int flags = nd_na->nd_na_flags_reserved;
|
|
int is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
|
|
int is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
|
|
int is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
|
|
char *lladdr = NULL;
|
|
int lladdrlen = 0;
|
|
struct ifaddr *ifa;
|
|
struct llinfo_nd6 *ln;
|
|
struct rtentry *rt;
|
|
struct sockaddr_dl *sdl;
|
|
union nd_opts ndopts;
|
|
|
|
if (ip6->ip6_hlim != 255) {
|
|
log(LOG_ERR,
|
|
"nd6_na_input: invalid hlim %d\n", ip6->ip6_hlim);
|
|
return;
|
|
}
|
|
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
|
|
taddr6.s6_addr16[1] = htons(ifp->if_index);
|
|
|
|
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
|
|
log(LOG_ERR,
|
|
"nd6_na_input: invalid target address %s\n",
|
|
ip6_sprintf(&taddr6));
|
|
return;
|
|
}
|
|
if (IN6_IS_ADDR_MULTICAST(&daddr6))
|
|
if (is_solicited) {
|
|
log(LOG_ERR,
|
|
"nd6_na_input: a solicited adv is multicasted\n");
|
|
return;
|
|
}
|
|
|
|
icmp6len -= sizeof(*nd_na);
|
|
nd6_option_init(nd_na + 1, icmp6len, &ndopts);
|
|
if (nd6_options(&ndopts) < 0) {
|
|
log(LOG_INFO, "nd6_na_input: invalid ND option, ignored\n");
|
|
return;
|
|
}
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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);
|
|
return;
|
|
}
|
|
|
|
/* Just for safety, maybe unnecessery. */
|
|
if (ifa) {
|
|
log(LOG_ERR,
|
|
"nd6_na_input: duplicate IP6 address %s\n",
|
|
ip6_sprintf(&taddr6));
|
|
return;
|
|
}
|
|
|
|
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
|
|
log(LOG_INFO,
|
|
"nd6_na_input: lladdrlen mismatch for %s "
|
|
"(if %d, NA packet %d)\n",
|
|
ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2);
|
|
}
|
|
|
|
/*
|
|
* If no neighbor cache entry is found, NA SHOULD silently be discarded.
|
|
*/
|
|
rt = nd6_lookup(&taddr6, 0, ifp);
|
|
if ((rt == NULL) ||
|
|
((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
|
|
((sdl = SDL(rt->rt_gateway)) == NULL))
|
|
return;
|
|
|
|
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)
|
|
return;
|
|
|
|
/*
|
|
* Record link-layer address, and update the state.
|
|
*/
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
|
|
if (is_solicited) {
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
if (ln->ln_expire)
|
|
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
|
ln->ln_expire = time.tv_sec +
|
|
#else
|
|
ln->ln_expire = time_second +
|
|
#endif
|
|
nd_ifinfo[rt->rt_ifp->if_index].reachable;
|
|
} else
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
ln->ln_router = is_router;
|
|
} else {
|
|
int llchange;
|
|
|
|
/*
|
|
* Check if the link-layer address has changed or not.
|
|
*/
|
|
if (!lladdr)
|
|
llchange = 0;
|
|
else {
|
|
if (sdl->sdl_alen) {
|
|
if (bcmp(lladdr, LLADDR(sdl), 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 && llchange)) { /* (1) */
|
|
/*
|
|
* If state is REACHABLE, make it STALE.
|
|
* no other updates should be done.
|
|
*/
|
|
if (ln->ln_state == ND6_LLINFO_REACHABLE)
|
|
ln->ln_state = ND6_LLINFO_STALE;
|
|
return;
|
|
} else if (is_override /* (2a) */
|
|
|| (!is_override && (lladdr && !llchange)) /* (2b) */
|
|
|| !lladdr) { /* (2c) */
|
|
/*
|
|
* Update link-local address, if any.
|
|
*/
|
|
if (lladdr) {
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
|
|
}
|
|
|
|
/*
|
|
* If solicited, make the state REACHABLE.
|
|
* If not solicited and the link-layer address was
|
|
* changed, make it STALE.
|
|
*/
|
|
if (is_solicited) {
|
|
ln->ln_state = ND6_LLINFO_REACHABLE;
|
|
if (ln->ln_expire) {
|
|
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
|
|
ln->ln_expire = time.tv_sec +
|
|
#else
|
|
ln->ln_expire = time_second +
|
|
#endif
|
|
nd_ifinfo[ifp->if_index].reachable;
|
|
}
|
|
} else {
|
|
if (lladdr && llchange)
|
|
ln->ln_state = 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 nd_defrouter *dr;
|
|
struct in6_addr *in6;
|
|
int s;
|
|
|
|
in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
|
|
#ifdef __NetBSD__
|
|
s = splsoftnet();
|
|
#else
|
|
s = splnet();
|
|
#endif
|
|
dr = defrouter_lookup(in6, rt->rt_ifp);
|
|
if (dr)
|
|
defrtrlist_del(dr);
|
|
else if (!ip6_forwarding && ip6_accept_rtadv) {
|
|
/*
|
|
* 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, rt->rt_ifp);
|
|
}
|
|
splx(s);
|
|
}
|
|
ln->ln_router = is_router;
|
|
}
|
|
rt->rt_flags &= ~RTF_REJECT;
|
|
ln->ln_asked = 0;
|
|
if (ln->ln_hold) {
|
|
#ifdef OLDIP6OUTPUT
|
|
(*ifp->if_output)(ifp, ln->ln_hold, rt_key(rt), rt);
|
|
#else
|
|
nd6_output(ifp, ln->ln_hold,
|
|
(struct sockaddr_in6 *)rt_key(rt), rt);
|
|
#endif
|
|
ln->ln_hold = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Neighbor advertisement output handling.
|
|
*
|
|
* Based on RFC 2461
|
|
*
|
|
* XXX NA delay for anycast address is not implemented yet
|
|
* (RFC 2461 7.2.7)
|
|
* XXX proxy advertisement?
|
|
*/
|
|
void
|
|
nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr)
|
|
struct ifnet *ifp;
|
|
struct in6_addr *daddr6, *taddr6;
|
|
u_long flags;
|
|
int tlladdr; /* 1 if include target link-layer address */
|
|
{
|
|
struct mbuf *m;
|
|
struct ip6_hdr *ip6;
|
|
struct nd_neighbor_advert *nd_na;
|
|
struct in6_ifaddr *ia = NULL;
|
|
struct ip6_moptions im6o;
|
|
int icmp6len;
|
|
caddr_t mac;
|
|
struct ifnet *outif = NULL;
|
|
|
|
if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
|
|
return;
|
|
|
|
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;
|
|
MH_ALIGN(m, m->m_len + 16); /* 1+1+6 is enough. but just in case */
|
|
|
|
/* fill neighbor advertisement packet */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 255;
|
|
if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
|
|
/* reply to DAD */
|
|
ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
|
|
ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
|
|
ip6->ip6_dst.s6_addr32[1] = 0;
|
|
ip6->ip6_dst.s6_addr32[2] = 0;
|
|
ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
|
|
flags &= ~ND_NA_FLAG_SOLICITED;
|
|
} else
|
|
ip6->ip6_dst = *daddr6;
|
|
|
|
/*
|
|
* Select a source whose scope is the same as that of the dest.
|
|
*/
|
|
ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
|
|
if (ia == NULL) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
ip6->ip6_src = ia->ia_addr.sin6_addr;
|
|
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;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target))
|
|
nd_na->nd_na_target.s6_addr16[1] = 0;
|
|
|
|
/*
|
|
* "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 && (mac = nd6_ifptomac(ifp))) {
|
|
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);
|
|
|
|
#ifdef IPSEC
|
|
#ifndef __OpenBSD__ /*KAME IPSEC*/
|
|
m->m_pkthdr.rcvif = NULL;
|
|
#endif
|
|
#endif /*IPSEC*/
|
|
ip6_output(m, NULL, NULL, 0, &im6o, &outif);
|
|
if (outif) {
|
|
icmp6_ifstat_inc(outif, ifs6_out_msg);
|
|
icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
|
|
}
|
|
icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
|
|
}
|
|
|
|
caddr_t
|
|
nd6_ifptomac(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
switch (ifp->if_type) {
|
|
case IFT_ARCNET:
|
|
case IFT_ETHER:
|
|
case IFT_FDDI:
|
|
#ifdef __NetBSD__
|
|
return LLADDR(ifp->if_sadl);
|
|
#else
|
|
return ((caddr_t)(ifp + 1));
|
|
#endif
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
TAILQ_HEAD(dadq_head, dadq);
|
|
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;
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
|
struct callout_handle dad_timer;
|
|
#endif
|
|
};
|
|
|
|
static struct dadq_head dadq;
|
|
|
|
static struct dadq *
|
|
nd6_dad_find(ifa)
|
|
struct ifaddr *ifa;
|
|
{
|
|
struct dadq *dp;
|
|
|
|
for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
|
|
if (dp->dad_ifa == ifa)
|
|
return dp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Start Duplicated Address Detection (DAD) for specified interface address.
|
|
*/
|
|
void
|
|
nd6_dad_start(ifa, tick)
|
|
struct ifaddr *ifa;
|
|
int *tick; /* minimum delay ticks for IFF_UP event */
|
|
{
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
struct dadq *dp;
|
|
static int dad_init = 0;
|
|
|
|
if (!dad_init) {
|
|
TAILQ_INIT(&dadq);
|
|
dad_init++;
|
|
}
|
|
|
|
/*
|
|
* If we don't need DAD, don't do it.
|
|
* There are several cases:
|
|
* - DAD is disabled (ip6_dad_count == 0)
|
|
* - the interface address is anycast
|
|
*/
|
|
if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
|
|
printf("nd6_dad_start: called with non-tentative address "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
return;
|
|
}
|
|
if (ia->ia6_flags & IN6_IFF_ANYCAST) {
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
return;
|
|
}
|
|
if (!ip6_dad_count) {
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
return;
|
|
}
|
|
if (!ifa->ifa_ifp)
|
|
panic("nd6_dad_start: ifa->ifa_ifp == NULL");
|
|
if (!(ifa->ifa_ifp->if_flags & IFF_UP))
|
|
return;
|
|
if (nd6_dad_find(ifa) != NULL) {
|
|
/* DAD already in progress */
|
|
return;
|
|
}
|
|
|
|
dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
|
|
if (dp == NULL) {
|
|
printf("nd6_dad_start: memory allocation failed for "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
return;
|
|
}
|
|
bzero(dp, sizeof(*dp));
|
|
TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
|
|
|
|
/* XXXJRT This is probably a purely debugging message. */
|
|
printf("%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(&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->ifa_refcnt++; /*just for safety*/
|
|
dp->dad_count = ip6_dad_count;
|
|
dp->dad_ns_icount = dp->dad_na_icount = 0;
|
|
dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
|
|
if (!tick) {
|
|
nd6_dad_ns_output(dp, ifa);
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
|
dp->dad_timer =
|
|
#endif
|
|
timeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa,
|
|
nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
|
|
} else {
|
|
int ntick;
|
|
|
|
if (*tick == 0)
|
|
ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz);
|
|
else
|
|
ntick = *tick + random() % (hz / 2);
|
|
*tick = ntick;
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
|
dp->dad_timer =
|
|
#endif
|
|
timeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa,
|
|
ntick);
|
|
}
|
|
}
|
|
|
|
static void
|
|
nd6_dad_timer(ifa)
|
|
struct ifaddr *ifa;
|
|
{
|
|
int s;
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
struct dadq *dp;
|
|
|
|
#ifdef __NetBSD__
|
|
s = splsoftnet(); /*XXX*/
|
|
#else
|
|
s = splnet(); /*XXX*/
|
|
#endif
|
|
|
|
/* Sanity check */
|
|
if (ia == NULL) {
|
|
printf("nd6_dad_timer: called with null parameter\n");
|
|
goto done;
|
|
}
|
|
dp = nd6_dad_find(ifa);
|
|
if (dp == NULL) {
|
|
printf("nd6_dad_timer: DAD structure not found\n");
|
|
goto done;
|
|
}
|
|
if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
|
|
printf("nd6_dad_timer: called with duplicated address "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
goto done;
|
|
}
|
|
if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
|
|
printf("nd6_dad_timer: called with non-tentative address "
|
|
"%s(%s)\n",
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr),
|
|
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
|
|
goto done;
|
|
}
|
|
|
|
/* timeouted with IFF_{RUNNING,UP} check */
|
|
if (dp->dad_ns_tcount > dad_maxtry) {
|
|
printf("%s: could not run DAD, driver problem?\n",
|
|
if_name(ifa->ifa_ifp));
|
|
|
|
TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
|
|
free(dp, M_IP6NDP);
|
|
dp = NULL;
|
|
ifa->ifa_refcnt--;
|
|
goto done;
|
|
}
|
|
|
|
/* Need more checks? */
|
|
if (dp->dad_ns_ocount < dp->dad_count) {
|
|
/*
|
|
* We have more NS to go. Send NS packet for DAD.
|
|
*/
|
|
nd6_dad_ns_output(dp, ifa);
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
|
dp->dad_timer =
|
|
#endif
|
|
timeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa,
|
|
nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
|
|
} else {
|
|
/*
|
|
* We have transmitted sufficient number of DAD packets.
|
|
* See what we've got.
|
|
*/
|
|
int duplicate;
|
|
|
|
duplicate = 0;
|
|
|
|
if (dp->dad_na_icount) {
|
|
/*
|
|
* the check is in nd6_dad_na_input(),
|
|
* but just in case
|
|
*/
|
|
duplicate++;
|
|
}
|
|
|
|
if (dp->dad_ns_icount) {
|
|
#if 0 /*heuristics*/
|
|
/*
|
|
* if
|
|
* - we have sent many(?) DAD NS, and
|
|
* - the number of NS we sent equals to the
|
|
* number of NS we've got, and
|
|
* - we've got no NA
|
|
* we may have a faulty network card/driver which
|
|
* loops back multicasts to myself.
|
|
*/
|
|
if (3 < dp->dad_count
|
|
&& dp->dad_ns_icount == dp->dad_count
|
|
&& dp->dad_na_icount == 0) {
|
|
log(LOG_INFO, "DAD questionable for %s(%s): "
|
|
"network card loops back multicast?\n",
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr),
|
|
if_name(ifa->ifa_ifp));
|
|
/* XXX consider it a duplicate or not? */
|
|
/* duplicate++; */
|
|
} else {
|
|
/* We've seen NS, means DAD has failed. */
|
|
duplicate++;
|
|
}
|
|
#else
|
|
/* We've seen NS, means DAD has failed. */
|
|
duplicate++;
|
|
#endif
|
|
}
|
|
|
|
if (duplicate) {
|
|
/* (*dp) will be freed in nd6_dad_duplicated() */
|
|
dp = NULL;
|
|
nd6_dad_duplicated(ifa);
|
|
} else {
|
|
/*
|
|
* We are done with DAD. No NA came, no NS came.
|
|
* duplicated address found.
|
|
*/
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
|
|
/* XXXJRT This is probably a purely debugging message */
|
|
printf("%s: DAD complete for %s - no duplicates "
|
|
"found\n", if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr));
|
|
|
|
TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
|
|
free(dp, M_IP6NDP);
|
|
dp = NULL;
|
|
ifa->ifa_refcnt--;
|
|
}
|
|
}
|
|
|
|
done:
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
nd6_dad_duplicated(ifa)
|
|
struct ifaddr *ifa;
|
|
{
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
struct dadq *dp;
|
|
|
|
dp = nd6_dad_find(ifa);
|
|
if (dp == NULL) {
|
|
printf("nd6_dad_duplicated: DAD structure not found\n");
|
|
return;
|
|
}
|
|
|
|
log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: %d NS, "
|
|
"%d NA\n", if_name(ifa->ifa_ifp),
|
|
ip6_sprintf(&ia->ia_addr.sin6_addr),
|
|
dp->dad_ns_icount, dp->dad_na_icount);
|
|
|
|
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
|
|
ia->ia6_flags |= IN6_IFF_DUPLICATED;
|
|
|
|
/* We are done with DAD, with duplicated address found. (failure) */
|
|
untimeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
|
, dp->dad_timer
|
|
#endif
|
|
);
|
|
|
|
printf("%s: DAD complete for %s - duplicate found\n",
|
|
if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
|
|
printf("%s: manual intervention required\n", if_name(ifa->ifa_ifp));
|
|
|
|
TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
|
|
free(dp, M_IP6NDP);
|
|
dp = NULL;
|
|
ifa->ifa_refcnt--;
|
|
}
|
|
|
|
static void
|
|
nd6_dad_ns_output(dp, ifa)
|
|
struct dadq *dp;
|
|
struct ifaddr *ifa;
|
|
{
|
|
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
|
|
struct ifnet *ifp = ifa->ifa_ifp;
|
|
|
|
dp->dad_ns_tcount++;
|
|
if ((ifp->if_flags & IFF_UP) == 0) {
|
|
#if 0
|
|
printf("%s: interface down?\n", if_name(ifp));
|
|
#endif
|
|
return;
|
|
}
|
|
if ((ifp->if_flags & IFF_RUNNING) == 0) {
|
|
#if 0
|
|
printf("%s: interface not running?\n", if_name(ifp));
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
dp->dad_ns_ocount++;
|
|
nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
|
|
}
|
|
|
|
static void
|
|
nd6_dad_ns_input(ifa)
|
|
struct ifaddr *ifa;
|
|
{
|
|
struct in6_ifaddr *ia;
|
|
struct ifnet *ifp;
|
|
struct in6_addr *taddr6;
|
|
struct dadq *dp;
|
|
int duplicate;
|
|
|
|
if (!ifa)
|
|
panic("ifa == NULL in nd6_dad_ns_input");
|
|
|
|
ia = (struct in6_ifaddr *)ifa;
|
|
ifp = ifa->ifa_ifp;
|
|
taddr6 = &ia->ia_addr.sin6_addr;
|
|
duplicate = 0;
|
|
dp = nd6_dad_find(ifa);
|
|
|
|
/*
|
|
* If it is from myself, ignore this.
|
|
*/
|
|
if (ifp && (ifp->if_flags & IFF_LOOPBACK))
|
|
return;
|
|
|
|
/* Quickhack - completely ignore DAD NS packets */
|
|
if (dad_ignore_ns) {
|
|
log(LOG_INFO, "nd6_dad_ns_input: ignoring DAD NS packet for "
|
|
"address %s(%s)\n", ip6_sprintf(taddr6),
|
|
if_name(ifa->ifa_ifp));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* if I'm yet to start DAD, someone else started using this address
|
|
* first. I have a duplicate and you win.
|
|
*/
|
|
if (!dp || dp->dad_ns_ocount == 0)
|
|
duplicate++;
|
|
|
|
/* XXX more checks for loopback situation - see nd6_dad_timer too */
|
|
|
|
if (duplicate) {
|
|
dp = NULL; /* will be freed in nd6_dad_duplicated() */
|
|
nd6_dad_duplicated(ifa);
|
|
} else {
|
|
/*
|
|
* not sure if I got a duplicate.
|
|
* increment ns count and see what happens.
|
|
*/
|
|
if (dp)
|
|
dp->dad_ns_icount++;
|
|
}
|
|
}
|
|
|
|
static void
|
|
nd6_dad_na_input(ifa)
|
|
struct ifaddr *ifa;
|
|
{
|
|
struct dadq *dp;
|
|
|
|
if (!ifa)
|
|
panic("ifa == NULL in nd6_dad_na_input");
|
|
|
|
dp = nd6_dad_find(ifa);
|
|
if (dp)
|
|
dp->dad_na_icount++;
|
|
|
|
/* remove the address. */
|
|
nd6_dad_duplicated(ifa);
|
|
}
|