b05648aa26
This is much better handled by a user-land tool. Proposed on tech-net here: https://mail-index.netbsd.org/tech-net/2020/04/22/msg007766.html Note that the ioctl SIOCGIFINFO_IN6 no longer sets flags. That now needs to be done using the pre-existing SIOCSIFINFO_FLAGS ioctl. Compat is fully provided where it makes sense, but trying to turn on RA handling will obviously throw an error as it no longer exists. Note that if you use IPv6 temporary addresses, this now needs to be turned on in dhcpcd.conf(5) rather than in sysctl.conf(5).
156 lines
4.6 KiB
C
156 lines
4.6 KiB
C
/* $NetBSD: nd6_rtr.c,v 1.149 2020/06/12 11:04:45 roy Exp $ */
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/* $KAME: nd6_rtr.c,v 1.95 2001/02/07 08:09:47 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nd6_rtr.c,v 1.149 2020/06/12 11:04:45 roy Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_net_mpsafe.h"
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#endif
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#include <sys/mbuf.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/nd6.h>
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#include <netinet/icmp6.h>
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#include <netinet6/icmp6_private.h>
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/*
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* Cache the source link layer address of Router Advertisement
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* and Solicition messages.
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*/
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void
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nd6_rtr_cache(struct mbuf *m, int off, int icmp6len, int icmp6_type)
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{
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struct ifnet *ifp;
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struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
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struct nd_router_solicit *nd_rs;
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struct nd_router_advert *nd_ra;
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struct in6_addr saddr6 = ip6->ip6_src;
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char *lladdr = NULL;
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int lladdrlen = 0;
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union nd_opts ndopts;
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struct psref psref;
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char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
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ifp = m_get_rcvif_psref(m, &psref);
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if (ifp == NULL)
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goto freeit;
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/* Sanity checks */
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if (ip6->ip6_hlim != 255) {
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nd6log(LOG_ERR, "invalid hlim (%d) from %s to %s on %s\n",
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ip6->ip6_hlim, IN6_PRINT(ip6bufs, &ip6->ip6_src),
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IN6_PRINT(ip6bufd, &ip6->ip6_dst), if_name(ifp));
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goto bad;
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}
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switch (icmp6_type) {
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case ND_ROUTER_SOLICIT:
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/*
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* Don't update the neighbor cache, if src = ::.
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* This indicates that the src has no IP address assigned yet.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
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goto freeit;
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IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off,
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icmp6len);
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if (nd_rs == NULL) {
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ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
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m_put_rcvif_psref(ifp, &psref);
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return;
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}
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icmp6len -= sizeof(*nd_rs);
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nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
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break;
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case ND_ROUTER_ADVERT:
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if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
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nd6log(LOG_ERR, "src %s is not link-local\n",
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IN6_PRINT(ip6bufs, &saddr6));
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goto bad;
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}
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IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off,
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icmp6len);
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if (nd_ra == NULL) {
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ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
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m_put_rcvif_psref(ifp, &psref);
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return;
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}
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icmp6len -= sizeof(*nd_ra);
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nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
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break;
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}
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if (nd6_options(&ndopts) < 0) {
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nd6log(LOG_INFO, "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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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 (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
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nd6log(LOG_INFO, "lladdrlen mismatch for %s "
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"(if %d, %s packet %d)\n",
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IN6_PRINT(ip6bufs, &saddr6),
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ifp->if_addrlen,
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icmp6_type == ND_ROUTER_SOLICIT ? "RS" : "RA",
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lladdrlen - 2);
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goto bad;
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}
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nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, icmp6_type, 0);
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freeit:
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m_put_rcvif_psref(ifp, &psref);
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m_freem(m);
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return;
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bad:
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ICMP6_STATINC(icmp6_type == ND_ROUTER_SOLICIT ?
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ICMP6_STAT_BADRS : ICMP6_STAT_BADRA);
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m_put_rcvif_psref(ifp, &psref);
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m_freem(m);
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}
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