#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#if __NetBSD__
#include "opt_ipsec.h"
#endif
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.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>
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
#include <sys/ioctl.h>
#endif
#include <sys/syslog.h>
#include <kern/queue.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet/icmp6.h>
#ifdef __OpenBSD__
#undef IPSEC
#endif
#if IPSEC
#include <netinet6/ipsec.h>
#endif
#include <net/net_osdep.h>
#define SDL(s) ((struct sockaddr_dl *)s)
struct dadq;
static struct dadq *nd6_dad_find __P((struct ifaddr *));
static void nd6_dad_timer __P((struct ifaddr *));
static void nd6_dad_timer_funnel __P((struct ifaddr *));
static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *));
static void nd6_dad_ns_input __P((struct ifaddr *));
static void nd6_dad_na_input __P((struct ifaddr *));
static int dad_ignore_ns = 0;
static int dad_maxtry = 15;
void
nd6_ns_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_solicit *nd_ns;
struct in6_addr saddr6 = ip6->ip6_src;
struct in6_addr daddr6 = ip6->ip6_dst;
struct in6_addr taddr6;
struct in6_addr myaddr6;
char *lladdr = NULL;
struct ifaddr *ifa;
int lladdrlen = 0;
int anycast = 0, proxy = 0, tentative = 0;
int tlladdr;
union nd_opts ndopts;
struct sockaddr_dl *proxydl = NULL;
if (ip6->ip6_hlim != 255) {
log(LOG_ERR,
"nd6_ns_input: invalid hlim %d\n", ip6->ip6_hlim);
goto freeit;
}
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL
&& daddr6.s6_addr32[1] == 0
&& daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE
&& daddr6.s6_addr8[12] == 0xff) {
;
} else {
log(LOG_INFO, "nd6_ns_input: bad DAD packet "
"(wrong ip6 dst)\n");
goto bad;
}
}
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len,);
nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
if (nd_ns == NULL) {
icmp6stat.icp6s_tooshort++;
return;
}
#endif
taddr6 = nd_ns->nd_ns_target;
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
log(LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n");
goto bad;
}
if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
taddr6.s6_addr16[1] = htons(ifp->if_index);
icmp6len -= sizeof(*nd_ns);
nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
log(LOG_INFO, "nd6_ns_input: invalid ND option, ignored\n");
goto bad;
}
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) {
log(LOG_INFO, "nd6_ns_input: bad DAD packet "
"(link-layer address option)\n");
goto bad;
}
#if 0
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
tlladdr = 0;
else
#endif
if (!IN6_IS_ADDR_MULTICAST(&daddr6))
tlladdr = 0;
else
tlladdr = 1;
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
if (!ifa) {
struct rtentry *rt;
struct sockaddr_in6 tsin6;
bzero(&tsin6, sizeof tsin6);
tsin6.sin6_len = sizeof(struct sockaddr_in6);
tsin6.sin6_family = AF_INET6;
tsin6.sin6_addr = taddr6;
rt = rtalloc1((struct sockaddr *)&tsin6, 0
#if __FreeBSD__ || defined (__APPLE__)
, 0
#endif
);
if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
rt->rt_gateway->sa_family == AF_LINK) {
ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
if (ifa) {
proxy = 1;
proxydl = SDL(rt->rt_gateway);
}
}
if (rt)
rtfree(rt);
}
if (!ifa) {
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) {
log(LOG_INFO,
"nd6_ns_input: lladdrlen mismatch for %s "
"(if %d, NS packet %d)\n",
ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2);
}
if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
log(LOG_INFO,
"nd6_ns_input: duplicate IP6 address %s\n",
ip6_sprintf(&saddr6));
goto freeit;
}
if (tentative) {
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
nd6_dad_ns_input(ifa);
goto freeit;
}
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
saddr6 = in6addr_linklocal_allnodes;
saddr6.s6_addr16[1] = htons(ifp->if_index);
nd6_na_output(ifp, &saddr6, &taddr6,
((anycast || proxy || !tlladdr)
? 0 : ND_NA_FLAG_OVERRIDE)
| (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
tlladdr, (struct sockaddr *)proxydl);
goto freeit;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
nd6_na_output(ifp, &saddr6, &taddr6,
((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE)
| (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
| ND_NA_FLAG_SOLICITED,
tlladdr, (struct sockaddr *)proxydl);
freeit:
m_freem(m);
return;
bad:
log(LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6));
log(LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6));
log(LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6));
m_freem(m);
}
void
nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
struct ifnet *ifp;
struct in6_addr *daddr6, *taddr6;
struct llinfo_nd6 *ln;
int dad;
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct nd_neighbor_solicit *nd_ns;
struct in6_ifaddr *ia = NULL;
struct ip6_moptions im6o;
int icmp6len;
int maxlen;
caddr_t mac;
struct ifnet *outif = NULL;
if (IN6_IS_ADDR_MULTICAST(taddr6))
return;
maxlen = sizeof(*ip6) + sizeof(*nd_ns);
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
if (max_linkhdr + maxlen >= MCLBYTES) {
#ifdef DIAGNOSTIC
printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
"(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
#endif
return;
}
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m && max_linkhdr + maxlen >= MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m = NULL;
}
}
if (m == NULL)
return;
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;
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 (daddr6)
ip6->ip6_dst = *daddr6;
else {
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] = IPV6_ADDR_INT32_ONE;
ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
ip6->ip6_dst.s6_addr8[12] = 0xff;
}
if (!dad) {
#if 0
ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
if (ia == NULL) {
m_freem(m);
return;
}
ip6->ip6_src = ia->ia_addr.sin6_addr;
#else
struct ip6_hdr *hip6;
struct in6_addr *saddr6;
if (ln && ln->ln_hold) {
hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
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);
return;
}
ip6->ip6_src = ia->ia_addr.sin6_addr;
}
#endif
} else {
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;
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);
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);
#if IPSEC
ipsec_setsocket(m, NULL);
#endif
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]++;
}
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;
#if 0
struct in6_addr saddr6 = ip6->ip6_src;
#endif
struct in6_addr daddr6 = ip6->ip6_dst;
struct in6_addr taddr6;
int flags;
int is_router;
int is_solicited;
int is_override;
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);
goto freeit;
}
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len,);
nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
if (nd_na == NULL) {
icmp6stat.icp6s_tooshort++;
return;
}
#endif
taddr6 = nd_na->nd_na_target;
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);
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));
goto freeit;
}
if (IN6_IS_ADDR_MULTICAST(&daddr6))
if (is_solicited) {
log(LOG_ERR,
"nd6_na_input: a solicited adv is multicasted\n");
goto freeit;
}
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");
goto freeit;
}
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
&& (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
nd6_dad_na_input(ifa);
goto freeit;
}
if (ifa) {
log(LOG_ERR,
"nd6_na_input: duplicate IP6 address %s\n",
ip6_sprintf(&taddr6));
goto freeit;
}
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);
}
rt = nd6_lookup(&taddr6, 0, ifp);
if ((rt == NULL) ||
((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
((sdl = SDL(rt->rt_gateway)) == NULL))
goto freeit;
if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
if (ifp->if_addrlen && !lladdr)
goto freeit;
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) && !defined(__APPLE__)
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;
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;
}
if (!is_override && (lladdr && llchange)) {
if (ln->ln_state == ND6_LLINFO_REACHABLE)
ln->ln_state = ND6_LLINFO_STALE;
goto freeit;
} else if (is_override
|| (!is_override && (lladdr && !llchange))
|| !lladdr) {
if (lladdr) {
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) && !defined(__APPLE__)
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) {
struct nd_defrouter *dr;
struct in6_addr *in6;
int s;
in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
#if __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) {
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) {
#if 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;
}
freeit:
m_freem(m);
}
void
nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0)
struct ifnet *ifp;
struct in6_addr *daddr6, *taddr6;
u_long flags;
int tlladdr;
struct sockaddr *sdl0;
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct nd_neighbor_advert *nd_na;
struct in6_ifaddr *ia = NULL;
struct ip6_moptions im6o;
int icmp6len;
int maxlen;
caddr_t mac;
struct ifnet *outif = NULL;
maxlen = sizeof(*ip6) + sizeof(*nd_na);
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
if (max_linkhdr + maxlen >= MCLBYTES) {
#ifdef DIAGNOSTIC
printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
"(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
#endif
return;
}
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m && max_linkhdr + maxlen >= MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m = NULL;
}
}
if (m == 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;
m->m_data += max_linkhdr;
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)) {
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;
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;
if (tlladdr) {
mac = NULL;
if (sdl0 == 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);
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 IPSEC
ipsec_setsocket(m, NULL);
#endif
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:
#if __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;
int dad_ns_tcount;
int dad_ns_ocount;
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;
}
void
nd6_dad_start(ifa, tick)
struct ifaddr *ifa;
int *tick;
{
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 (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
log(LOG_DEBUG,
"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) {
return;
}
dp = _MALLOC(sizeof(*dp), M_IP6NDP, M_NOWAIT);
if (dp == NULL) {
log(LOG_ERR, "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);
#if ND6_DEBUG
log(LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
ip6_sprintf(&ia->ia_addr.sin6_addr));
#endif
dp->dad_ifa = ifa;
ifa->ifa_refcnt++;
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_funnel, (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_funnel, (void *)ifa,
ntick);
}
}
static void
nd6_dad_timer_funnel(ifa)
struct ifaddr *ifa;
{
#ifdef __APPLE__
boolean_t funnel_state;
funnel_state = thread_funnel_set(network_flock, TRUE);
#endif
nd6_dad_timer(ifa);
#ifdef __APPLE__
(void) thread_funnel_set(network_flock, FALSE);
#endif
}
static void
nd6_dad_timer(ifa)
struct ifaddr *ifa;
{
int s;
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
#if __NetBSD__
s = splsoftnet();
#else
s = splnet();
#endif
if (ia == NULL) {
log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
goto done;
}
dp = nd6_dad_find(ifa);
if (dp == NULL) {
log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
goto done;
}
if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
log(LOG_ERR, "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) {
log(LOG_ERR, "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;
}
if (dp->dad_ns_tcount > dad_maxtry) {
log(LOG_ERR, "%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;
IFAFREE(ifa);
goto done;
}
if (dp->dad_ns_ocount < dp->dad_count) {
nd6_dad_ns_output(dp, ifa);
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
dp->dad_timer =
#endif
timeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa,
nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
} else {
int duplicate;
duplicate = 0;
if (dp->dad_na_icount) {
duplicate++;
}
if (dp->dad_ns_icount) {
#if 0
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));
} else {
duplicate++;
}
#else
duplicate++;
#endif
}
if (duplicate) {
dp = NULL;
nd6_dad_duplicated(ifa);
} else {
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
#if ND6_DEBUG
log(LOG_INFO,
"%s: DAD complete for %s - no duplicates found\n",
if_name(ifa->ifa_ifp),
ip6_sprintf(&ia->ia_addr.sin6_addr));
#endif
TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
_FREE(dp, M_IP6NDP);
dp = NULL;
IFAFREE(ifa);
}
}
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) {
log(LOG_ERR, "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;
untimeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
, dp->dad_timer
#endif
);
log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
log(LOG_ERR, "%s: manual intervention required\n",
if_name(ifa->ifa_ifp));
TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
_FREE(dp, M_IP6NDP);
dp = NULL;
IFAFREE(ifa);
}
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 (ifp && (ifp->if_flags & IFF_LOOPBACK))
return;
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 (!dp || dp->dad_ns_ocount == 0)
duplicate++;
if (duplicate) {
dp = NULL;
nd6_dad_duplicated(ifa);
} else {
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++;
nd6_dad_duplicated(ifa);
}