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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the project nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $
- */
- #include <sys/cdefs.h>
- #include "opt_inet.h"
- #include "opt_inet6.h"
- #include "opt_ipsec.h"
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/eventhandler.h>
- #include <sys/malloc.h>
- #include <sys/libkern.h>
- #include <sys/lock.h>
- #include <sys/rwlock.h>
- #include <sys/mbuf.h>
- #include <sys/socket.h>
- #include <sys/sockio.h>
- #include <sys/time.h>
- #include <sys/kernel.h>
- #include <sys/errno.h>
- #include <sys/sysctl.h>
- #include <sys/syslog.h>
- #include <sys/queue.h>
- #include <sys/callout.h>
- #include <sys/refcount.h>
- #include <net/if.h>
- #include <net/if_types.h>
- #include <net/if_dl.h>
- #include <net/if_var.h>
- #include <net/if_private.h>
- #include <net/route.h>
- #include <net/vnet.h>
- #include <netinet/in.h>
- #include <netinet/in_var.h>
- #include <net/if_llatbl.h>
- #include <netinet6/in6_var.h>
- #include <netinet6/in6_ifattach.h>
- #include <netinet/ip6.h>
- #include <netinet6/ip6_var.h>
- #include <netinet6/scope6_var.h>
- #include <netinet6/nd6.h>
- #include <netinet/icmp6.h>
- #include <netinet/ip_carp.h>
- #include <netinet6/send.h>
- #define SDL(s) ((struct sockaddr_dl *)s)
- struct dadq;
- static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
- static void nd6_dad_add(struct dadq *dp);
- static void nd6_dad_del(struct dadq *dp);
- static void nd6_dad_rele(struct dadq *);
- static void nd6_dad_starttimer(struct dadq *, int);
- static void nd6_dad_stoptimer(struct dadq *);
- static void nd6_dad_timer(void *);
- static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
- static void nd6_dad_ns_output(struct dadq *);
- static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
- static void nd6_dad_na_input(struct ifaddr *);
- static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
- const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
- static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
- const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
- static struct ifaddr *nd6_proxy_fill_sdl(struct ifnet *,
- const struct in6_addr *, struct sockaddr_dl *);
- VNET_DEFINE_STATIC(int, dad_enhanced) = 1;
- #define V_dad_enhanced VNET(dad_enhanced)
- SYSCTL_DECL(_net_inet6_ip6);
- SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(dad_enhanced), 0,
- "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
- VNET_DEFINE_STATIC(int, dad_maxtry) = 15; /* max # of *tries* to
- transmit DAD packet */
- #define V_dad_maxtry VNET(dad_maxtry)
- VNET_DEFINE_STATIC(int, nd6_onlink_ns_rfc4861) = 0;
- #define V_nd6_onlink_ns_rfc4861 VNET(nd6_onlink_ns_rfc4861)
- SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
- nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(nd6_onlink_ns_rfc4861), 0,
- "Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861");
- /*
- * Input a Neighbor Solicitation Message.
- *
- * Based on RFC 2461
- * Based on RFC 2462 (duplicate address detection)
- */
- void
- nd6_ns_input(struct mbuf *m, int off, int icmp6len)
- {
- struct ifnet *ifp;
- struct ip6_hdr *ip6;
- struct nd_neighbor_solicit *nd_ns;
- struct in6_addr daddr6, myaddr6, saddr6, taddr6;
- struct ifaddr *ifa;
- struct sockaddr_dl proxydl;
- union nd_opts ndopts;
- char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
- char *lladdr;
- int anycast, lladdrlen, proxy, rflag, tentative, tlladdr;
- ifa = NULL;
- /* 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_ns_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 bads;
- }
- 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_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
- saddr6 = ip6->ip6_src;
- daddr6 = ip6->ip6_dst;
- taddr6 = nd_ns->nd_ns_target;
- if (in6_setscope(&taddr6, ifp, NULL) != 0)
- goto bad;
- rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
- if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
- rflag = 0;
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
- /* dst has to be a solicited node multicast address. */
- if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
- /* don't check ifindex portion */
- daddr6.s6_addr32[1] == 0 &&
- daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
- daddr6.s6_addr8[12] == 0xff) {
- ; /* good */
- } else {
- nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
- "(wrong ip6 dst)\n"));
- goto bad;
- }
- } else if (!V_nd6_onlink_ns_rfc4861) {
- struct sockaddr_in6 src_sa6;
- /*
- * According to recent IETF discussions, it is not a good idea
- * to accept a NS from an address which would not be deemed
- * to be a neighbor otherwise. This point is expected to be
- * clarified in future revisions of the specification.
- */
- bzero(&src_sa6, sizeof(src_sa6));
- src_sa6.sin6_family = AF_INET6;
- src_sa6.sin6_len = sizeof(src_sa6);
- src_sa6.sin6_addr = saddr6;
- if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
- nd6log((LOG_INFO, "nd6_ns_input: "
- "NS packet from non-neighbor\n"));
- goto bad;
- }
- }
- if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
- nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
- goto bad;
- }
- icmp6len -= sizeof(*nd_ns);
- nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
- if (nd6_options(&ndopts) < 0) {
- nd6log((LOG_INFO,
- "nd6_ns_input: invalid ND option, ignored\n"));
- /* nd6_options have incremented stats */
- goto freeit;
- }
- lladdr = NULL;
- lladdrlen = 0;
- if (ndopts.nd_opts_src_lladdr) {
- lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
- lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
- }
- if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
- nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
- "(link-layer address option)\n"));
- goto bad;
- }
- /*
- * Attaching target link-layer address to the NA?
- * (RFC 2461 7.2.4)
- *
- * NS IP dst is unicast/anycast MUST NOT add
- * NS IP dst is solicited-node multicast MUST add
- *
- * In implementation, we add target link-layer address by default.
- * We do not add one in MUST NOT cases.
- */
- if (!IN6_IS_ADDR_MULTICAST(&daddr6))
- tlladdr = 0;
- else
- tlladdr = 1;
- /*
- * Target address (taddr6) must be either:
- * (1) Valid unicast/anycast address for my receiving interface,
- * (2) Unicast address for which I'm offering proxy service, or
- * (3) "tentative" address on which DAD is being performed.
- */
- /* (1) and (3) check. */
- if (ifp->if_carp)
- ifa = (*carp_iamatch6_p)(ifp, &taddr6);
- else
- ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
- /* (2) check. */
- proxy = 0;
- if (ifa == NULL) {
- if ((ifa = nd6_proxy_fill_sdl(ifp, &taddr6, &proxydl)) != NULL)
- proxy = 1;
- }
- if (ifa == NULL) {
- /*
- * We've got an NS packet, and we don't have that address
- * assigned for us. We MUST silently ignore it.
- * See RFC2461 7.2.3.
- */
- goto freeit;
- }
- myaddr6 = *IFA_IN6(ifa);
- anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
- tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
- if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
- goto freeit;
- if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
- nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
- "(if %d, NS packet %d)\n",
- ip6_sprintf(ip6bufs, &taddr6),
- ifp->if_addrlen, lladdrlen - 2));
- goto bad;
- }
- if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
- nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
- ip6_sprintf(ip6bufs, &saddr6)));
- goto freeit;
- }
- /*
- * We have neighbor solicitation packet, with target address equals to
- * one of my tentative address.
- *
- * src addr how to process?
- * --- ---
- * multicast of course, invalid (rejected in ip6_input)
- * unicast somebody is doing address resolution -> ignore
- * unspec dup address detection
- *
- * The processing is defined in RFC 2462.
- */
- if (tentative) {
- /*
- * If source address is unspecified address, it is for
- * duplicate address detection.
- *
- * If not, the packet is for addess resolution;
- * silently ignore it.
- */
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
- nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
- goto freeit;
- }
- /*
- * If the source address is unspecified address, entries must not
- * be created or updated.
- * It looks that sender is performing DAD. Output NA toward
- * all-node multicast address, to tell the sender that I'm using
- * the address.
- * S bit ("solicited") must be zero.
- */
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
- struct in6_addr in6_all;
- in6_all = in6addr_linklocal_allnodes;
- if (in6_setscope(&in6_all, ifp, NULL) != 0)
- goto bad;
- nd6_na_output_fib(ifp, &in6_all, &taddr6,
- ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
- rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
- M_GETFIB(m));
- goto freeit;
- }
- nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
- ND_NEIGHBOR_SOLICIT, 0);
- nd6_na_output_fib(ifp, &saddr6, &taddr6,
- ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
- rflag | ND_NA_FLAG_SOLICITED, tlladdr,
- proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
- freeit:
- if (ifa != NULL)
- ifa_free(ifa);
- m_freem(m);
- return;
- bad:
- nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
- ip6_sprintf(ip6bufs, &saddr6)));
- nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
- ip6_sprintf(ip6bufs, &daddr6)));
- nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
- ip6_sprintf(ip6bufs, &taddr6)));
- bads:
- ICMP6STAT_INC(icp6s_badns);
- if (ifa != NULL)
- ifa_free(ifa);
- m_freem(m);
- }
- static struct ifaddr *
- nd6_proxy_fill_sdl(struct ifnet *ifp, const struct in6_addr *taddr6,
- struct sockaddr_dl *sdl)
- {
- struct ifaddr *ifa;
- struct llentry *ln;
- ifa = NULL;
- ln = nd6_lookup(taddr6, LLE_SF(AF_INET6, 0), ifp);
- if (ln == NULL)
- return (ifa);
- if ((ln->la_flags & (LLE_PUB | LLE_VALID)) == (LLE_PUB | LLE_VALID)) {
- link_init_sdl(ifp, (struct sockaddr *)sdl, ifp->if_type);
- sdl->sdl_alen = ifp->if_addrlen;
- bcopy(ln->ll_addr, &sdl->sdl_data, ifp->if_addrlen);
- LLE_RUNLOCK(ln);
- ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
- IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
- } else
- 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)) {
- nd6log((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_INC2(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)) {
- nd6log((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_INC2(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();
- }
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