#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#ifdef __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/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/domain.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#if defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/mld6_var.h>
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__OpenBSD__) && !(defined(__bsdi__) && _BSDI_VERSION >= 199802) && !defined(__APPLE__)
#include <netinet6/in6_pcb.h>
#else
#include <netinet/in_pcb.h>
#endif
#include <netinet6/nd6.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6protosw.h>
#ifdef __OpenBSD__
#undef IPSEC
#endif
#if IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#include <netkey/key_debug.h>
#endif
#include "faith.h"
#include <net/net_osdep.h>
extern struct domain inet6domain;
extern struct ip6protosw inet6sw[];
extern struct ip6protosw *ip6_protox[];
struct icmp6stat icmp6stat;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
extern struct in6pcb rawin6pcb;
#else
extern struct inpcbhead ripcb;
#endif
extern u_int icmp6errratelim;
extern int icmp6_nodeinfo;
#if defined(__NetBSD__) || defined(__OpenBSD__)
static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL;
extern int pmtu_expire;
#endif
#ifndef HAVE_NRL_INPCB
static int icmp6_rip6_input __P((struct mbuf **, int));
#endif
static void icmp6_mtudisc_update __P((struct in6_addr *, struct icmp6_hdr *,
struct mbuf *));
static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
static const char *icmp6_redirect_diag __P((struct in6_addr *,
struct in6_addr *, struct in6_addr *));
static struct mbuf * ni6_input __P((struct mbuf *, int));
static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
struct ifnet **));
static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
struct ifnet *, int));
#if defined(__NetBSD__) || defined(__OpenBSD__)
static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *));
static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *));
#endif
#ifdef COMPAT_RFC1885
static struct route_in6 icmp6_reflect_rt;
#endif
static struct timeval icmp6_nextsend = {0, 0};
#if MIP6
int (*mip6_icmp6_input_hook)(struct mbuf *m, int off) = NULL;
#endif
void
icmp6_init()
{
mld6_init();
#if defined(__NetBSD__) || defined(__OpenBSD__)
icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire);
#endif
}
void
icmp6_error(m, type, code, param)
struct mbuf *m;
int type, code, param;
{
struct ip6_hdr *oip6, *nip6;
struct icmp6_hdr *icmp6;
u_int preplen;
int off;
int nxt;
icmp6stat.icp6s_error++;
#ifdef M_DECRYPTED
if (m->m_flags & M_DECRYPTED) {
icmp6stat.icp6s_canterror++;
goto freeit;
}
#endif
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
#else
if (m->m_len < sizeof(struct ip6_hdr)) {
m = m_pullup(m, sizeof(struct ip6_hdr));
if (m == NULL)
return;
}
#endif
oip6 = mtod(m, struct ip6_hdr *);
if ((m->m_flags & (M_BCAST|M_MCAST) ||
IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
(type != ICMP6_PACKET_TOO_BIG &&
(type != ICMP6_PARAM_PROB ||
code != ICMP6_PARAMPROB_OPTION)))
goto freeit;
if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
goto freeit;
nxt = -1;
off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
if (off >= 0 && nxt == IPPROTO_ICMPV6) {
struct icmp6_hdr *icp;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
sizeof(*icp));
if (icp == NULL) {
icmp6stat.icp6s_tooshort++;
return;
}
#endif
if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
icp->icmp6_type == ND_REDIRECT) {
icmp6stat.icp6s_canterror++;
goto freeit;
} else {
}
} else {
}
oip6 = mtod(m, struct ip6_hdr *);
if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
icmp6stat.icp6s_toofreq++;
goto freeit;
}
if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
M_PREPEND(m, preplen, M_DONTWAIT);
if (m && m->m_len < preplen)
m = m_pullup(m, preplen);
if (m == NULL) {
printf("ENOBUFS in icmp6_error %d\n", __LINE__);
return;
}
nip6 = mtod(m, struct ip6_hdr *);
nip6->ip6_src = oip6->ip6_src;
nip6->ip6_dst = oip6->ip6_dst;
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
oip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
oip6->ip6_dst.s6_addr16[1] = 0;
icmp6 = (struct icmp6_hdr *)(nip6 + 1);
icmp6->icmp6_type = type;
icmp6->icmp6_code = code;
icmp6->icmp6_pptr = htonl((u_int32_t)param);
icmp6stat.icp6s_outhist[type]++;
icmp6_reflect(m, sizeof(struct ip6_hdr));
return;
freeit:
m_freem(m);
}
int
icmp6_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp, *n;
struct ip6_hdr *ip6, *nip6;
struct icmp6_hdr *icmp6, *nicmp6;
int off = *offp;
int icmp6len = m->m_pkthdr.len - *offp;
int code, sum, noff;
struct sockaddr_in6 icmp6src;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
#endif
ip6 = mtod(m, struct ip6_hdr *);
if (icmp6len < sizeof(struct icmp6_hdr)) {
icmp6stat.icp6s_tooshort++;
goto freeit;
}
#ifndef PULLDOWN_TEST
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
if (icmp6 == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
code = icmp6->icmp6_code;
if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
log(LOG_ERR,
"ICMP6 checksum error(%d|%x) %s\n",
icmp6->icmp6_type,
sum,
ip6_sprintf(&ip6->ip6_src));
icmp6stat.icp6s_checksum++;
goto freeit;
}
#if defined(NFAITH) && 0 < NFAITH
if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
switch (icmp6->icmp6_type) {
case ICMP6_DST_UNREACH:
case ICMP6_PACKET_TOO_BIG:
case ICMP6_TIME_EXCEEDED:
break;
default:
goto freeit;
}
}
#endif
#if IPSEC
if (ipsec6_in_reject(m, NULL)) {
ipsecstat.in_polvio++;
goto freeit;
}
#endif
icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
#if MIP6
if (mip6_icmp6_input_hook) {
if ((*mip6_icmp6_input_hook)(m, off) != 0)
goto freeit;
}
#endif
switch (icmp6->icmp6_type) {
case ICMP6_DST_UNREACH:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
switch (code) {
case ICMP6_DST_UNREACH_NOROUTE:
code = PRC_UNREACH_NET;
break;
case ICMP6_DST_UNREACH_ADMIN:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
code = PRC_UNREACH_PROTOCOL;
break;
case ICMP6_DST_UNREACH_ADDR:
code = PRC_HOSTDEAD;
break;
#ifdef COMPAT_RFC1885
case ICMP6_DST_UNREACH_NOTNEIGHBOR:
code = PRC_UNREACH_SRCFAIL;
break;
#else
case ICMP6_DST_UNREACH_BEYONDSCOPE:
code = PRC_PARAMPROB;
break;
#endif
case ICMP6_DST_UNREACH_NOPORT:
code = PRC_UNREACH_PORT;
break;
default:
goto badcode;
}
goto deliver;
break;
case ICMP6_PACKET_TOO_BIG:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
if (code != 0)
goto badcode;
code = PRC_MSGSIZE;
goto deliver;
break;
case ICMP6_TIME_EXCEEDED:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
switch (code) {
case ICMP6_TIME_EXCEED_TRANSIT:
case ICMP6_TIME_EXCEED_REASSEMBLY:
code += PRC_TIMXCEED_INTRANS;
break;
default:
goto badcode;
}
goto deliver;
break;
case ICMP6_PARAM_PROB:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
switch (code) {
case ICMP6_PARAMPROB_NEXTHEADER:
code = PRC_UNREACH_PROTOCOL;
break;
case ICMP6_PARAMPROB_HEADER:
case ICMP6_PARAMPROB_OPTION:
code = PRC_PARAMPROB;
break;
default:
goto badcode;
}
goto deliver;
break;
case ICMP6_ECHO_REQUEST:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
if (code != 0)
goto badcode;
if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
break;
}
if ((n->m_flags & M_EXT) != 0
|| n->m_len < off + sizeof(struct icmp6_hdr)) {
struct mbuf *n0 = n;
const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
if (maxlen >= MCLBYTES) {
#if DIAGNOSTIC
printf("MCLBYTES too small\n");
#endif
m_freem(n0);
break;
}
MGETHDR(n, M_DONTWAIT, n0->m_type);
if (n && maxlen >= MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (n == NULL) {
m_freem(n0);
break;
}
M_COPY_PKTHDR(n, n0);
nip6 = mtod(n, struct ip6_hdr *);
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
noff = sizeof(struct ip6_hdr);
n->m_pkthdr.len = n->m_len =
noff + sizeof(struct icmp6_hdr);
m_adj(n0, off + sizeof(struct icmp6_hdr));
n->m_pkthdr.len += n0->m_pkthdr.len;
n->m_next = n0;
n0->m_flags &= ~M_PKTHDR;
} else {
nip6 = mtod(n, struct ip6_hdr *);
nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
noff = off;
}
nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
nicmp6->icmp6_code = 0;
if (n) {
icmp6stat.icp6s_reflect++;
icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
icmp6_reflect(n, noff);
}
break;
case ICMP6_ECHO_REPLY:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
if (code != 0)
goto badcode;
break;
case MLD6_LISTENER_QUERY:
case MLD6_LISTENER_REPORT:
if (icmp6len < sizeof(struct mld6_hdr))
goto badlen;
if (icmp6->icmp6_type == MLD6_LISTENER_QUERY)
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
else
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
mld6_input(m, off);
m = NULL;
goto freeit;
}
mld6_input(n, off);
break;
case MLD6_LISTENER_DONE:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
if (icmp6len < sizeof(struct mld6_hdr))
goto badlen;
break;
case MLD6_MTRACE_RESP:
case MLD6_MTRACE:
break;
case ICMP6_WRUREQUEST:
{
enum { WRU, FQDN } mode;
if (code != 0)
goto badcode;
if (!icmp6_nodeinfo)
break;
if (icmp6len == sizeof(struct icmp6_hdr) + 4)
mode = WRU;
else if (icmp6len >= sizeof(struct icmp6_hdr) + 8)
mode = FQDN;
else
goto badlen;
#if defined( __FreeBSD__) || defined (__APPLE__)
#define hostnamelen strlen(hostname)
#endif
if (mode == FQDN) {
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
IPPROTO_DONE);
#endif
n = m_copy(m, 0, M_COPYALL);
if (n)
n = ni6_input(n, off);
if (n)
noff = sizeof(struct ip6_hdr);
} else {
u_char *p;
int maxlen, maxhlen;
maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
if (maxlen >= MCLBYTES) {
#if DIAGNOSTIC
printf("MCLBYTES too small\n");
#endif
break;
}
MGETHDR(n, M_DONTWAIT, m->m_type);
if (n && maxlen > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (n == NULL) {
break;
}
n->m_len = 0;
maxhlen = M_TRAILINGSPACE(n) - maxlen;
if (maxhlen > hostnamelen)
maxhlen = hostnamelen;
nip6 = mtod(n, struct ip6_hdr *);
bcopy(ip6, nip6, sizeof(struct ip6_hdr));
nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
p = (u_char *)(nicmp6 + 1);
bzero(p, 4);
bcopy(hostname, p + 4, maxhlen);
noff = sizeof(struct ip6_hdr);
M_COPY_PKTHDR(n, m);
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
sizeof(struct icmp6_hdr) + 4 + maxhlen;
nicmp6->icmp6_type = ICMP6_WRUREPLY;
nicmp6->icmp6_code = 0;
}
#undef hostnamelen
if (n) {
icmp6stat.icp6s_reflect++;
icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
icmp6_reflect(n, noff);
}
break;
}
case ICMP6_WRUREPLY:
if (code != 0)
goto badcode;
break;
case ND_ROUTER_SOLICIT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_router_solicit))
goto badlen;
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_rs_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
nd6_rs_input(n, off, icmp6len);
break;
case ND_ROUTER_ADVERT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_router_advert))
goto badlen;
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_ra_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
nd6_ra_input(n, off, icmp6len);
break;
case ND_NEIGHBOR_SOLICIT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_neighbor_solicit))
goto badlen;
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_ns_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
nd6_ns_input(n, off, icmp6len);
break;
case ND_NEIGHBOR_ADVERT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_neighbor_advert))
goto badlen;
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_na_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
nd6_na_input(n, off, icmp6len);
break;
case ND_REDIRECT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
if (code != 0)
goto badcode;
if (icmp6len < sizeof(struct nd_redirect))
goto badlen;
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
icmp6_redirect_input(m, off);
m = NULL;
goto freeit;
}
icmp6_redirect_input(n, off);
break;
case ICMP6_ROUTER_RENUMBERING:
if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
code != ICMP6_ROUTER_RENUMBERING_RESULT)
goto badcode;
if (icmp6len < sizeof(struct icmp6_router_renum))
goto badlen;
break;
default:
printf("icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0);
if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
code = PRC_NCMDS;
} else {
break;
}
deliver:
if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
icmp6stat.icp6s_tooshort++;
goto freeit;
}
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off,
sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
IPPROTO_DONE);
icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
sizeof(*icmp6) + sizeof(struct ip6_hdr));
if (icmp6 == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
bzero(&icmp6src, sizeof(icmp6src));
icmp6src.sin6_len = sizeof(struct sockaddr_in6);
icmp6src.sin6_family = AF_INET6;
icmp6src.sin6_addr = ((struct ip6_hdr *)(icmp6 + 1))->ip6_dst;
{
void (*ctlfunc) __P((int, struct sockaddr *, void *));
struct ip6_hdr *eip6 = (struct ip6_hdr *)(icmp6 + 1);
u_int8_t nxt = eip6->ip6_nxt;
int eoff = off + sizeof(struct icmp6_hdr) +
sizeof(struct ip6_hdr);
struct ip6ctlparam ip6cp;
struct in6_addr *finaldst = NULL;
int icmp6type = icmp6->icmp6_type;
struct ip6_frag *fh;
struct ip6_rthdr *rth;
struct ip6_rthdr0 *rth0;
int rthlen;
while (1) {
struct ip6_ext *eh;
switch(nxt) {
case IPPROTO_HOPOPTS:
case IPPROTO_DSTOPTS:
case IPPROTO_AH:
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, eoff +
sizeof(struct ip6_ext),
IPPROTO_DONE);
eh = (struct ip6_ext *)(mtod(m, caddr_t)
+ eoff);
#else
IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
eoff, sizeof(*eh));
if (eh == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
if (nxt == IPPROTO_AH)
eoff += (eh->ip6e_len + 2) << 2;
else
eoff += (eh->ip6e_len + 1) << 3;
nxt = eh->ip6e_nxt;
break;
case IPPROTO_ROUTING:
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
IPPROTO_DONE);
rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
+ eoff);
#else
IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
eoff, sizeof(*rth));
if (rth == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
rthlen = (rth->ip6r_len + 1) << 3;
if (rth->ip6r_segleft &&
rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
int hops;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
IPPROTO_DONE);
rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
#else
IP6_EXTHDR_GET(rth0,
struct ip6_rthdr0 *, m,
eoff, rthlen);
if (rth0 == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
if ((rth0->ip6r0_len % 2) == 0 &&
(hops = rth0->ip6r0_len/2))
finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
}
eoff += rthlen;
nxt = rth->ip6r_nxt;
break;
case IPPROTO_FRAGMENT:
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, eoff +
sizeof(struct ip6_frag),
IPPROTO_DONE);
fh = (struct ip6_frag *)(mtod(m, caddr_t)
+ eoff);
#else
IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
eoff, sizeof(*fh));
if (fh == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
if (fh->ip6f_offlg & IP6F_OFF_MASK)
goto notify;
eoff += sizeof(struct ip6_frag);
nxt = fh->ip6f_nxt;
break;
default:
goto notify;
}
}
notify:
#ifndef PULLDOWN_TEST
icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
sizeof(*icmp6) + sizeof(struct ip6_hdr));
if (icmp6 == NULL) {
icmp6stat.icp6s_tooshort++;
return IPPROTO_DONE;
}
#endif
if (icmp6type == ICMP6_PACKET_TOO_BIG) {
if (finaldst == NULL)
finaldst = &((struct ip6_hdr *)(icmp6 + 1))->ip6_dst;
icmp6_mtudisc_update(finaldst, icmp6, m);
}
ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
(ip6_protox[nxt]->pr_ctlinput);
if (ctlfunc) {
ip6cp.ip6c_m = m;
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
ip6cp.ip6c_off = eoff;
(*ctlfunc)(code, (struct sockaddr *)&icmp6src, &ip6cp);
}
}
break;
badcode:
icmp6stat.icp6s_badcode++;
break;
badlen:
icmp6stat.icp6s_badlen++;
break;
}
#if HAVE_NRL_INPCB
rip6_input(&m, offp, IPPROTO_ICMPV6);
#else
icmp6_rip6_input(&m, *offp);
#endif
return IPPROTO_DONE;
freeit:
m_freem(m);
return IPPROTO_DONE;
}
static void
icmp6_mtudisc_update(dst, icmp6, m)
struct in6_addr *dst;
struct icmp6_hdr *icmp6;
struct mbuf *m;
{
u_int mtu = ntohl(icmp6->icmp6_mtu);
struct rtentry *rt = NULL;
struct sockaddr_in6 sin6;
#ifdef __bsdi__
struct route_in6 ro6;
#endif
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = PF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *dst;
#if defined(__NetBSD__) || defined(__OpenBSD__)
rt = rtalloc1((struct sockaddr *)&sin6, 1);
if (!rt || (rt->rt_flags & RTF_HOST) == 0) {
if (rt)
RTFREE(rt);
rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6);
}
#else
#if defined(__FreeBSD__) || defined (__APPLE__)
rt = rtalloc1((struct sockaddr *)&sin6, 0,
RTF_CLONING | RTF_PRCLONING);
#else
#ifdef __bsdi__
bcopy(&sin6, &ro6.ro_dst, sizeof(struct sockaddr_in6));
ro6.ro_rt = 0;
rtcalloc((struct route *)&ro6);
rt = ro6.ro_rt;
#else
#error no case for this particular operating system
#endif
#endif
#endif
if (rt && (rt->rt_flags & RTF_HOST)
&& !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
if (mtu < IPV6_MMTU) {
rt->rt_rmx.rmx_locks |= RTV_MTU;
} else if (mtu < rt->rt_ifp->if_mtu &&
rt->rt_rmx.rmx_mtu > mtu) {
rt->rt_rmx.rmx_mtu = mtu;
}
}
if (rt)
RTFREE(rt);
}
#if defined(__FreeBSD__) || defined (__APPLE__)
#define hostnamelen strlen(hostname)
#endif
#ifndef offsetof
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
#endif
static struct mbuf *
ni6_input(m, off)
struct mbuf *m;
int off;
{
struct icmp6_nodeinfo *ni6, *nni6;
struct mbuf *n = NULL;
u_int16_t qtype;
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
struct ni_reply_fqdn *fqdn;
int addrs;
struct ifnet *ifp = NULL;
#ifndef PULLDOWN_TEST
ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
if (ni6 == NULL) {
return NULL;
}
#endif
qtype = ntohs(ni6->ni_qtype);
switch(qtype) {
case NI_QTYPE_NOOP:
break;
case NI_QTYPE_SUPTYPES:
goto bad;
break;
case NI_QTYPE_FQDN:
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_name) +
hostnamelen;
break;
case NI_QTYPE_NODEADDR:
addrs = ni6_addrs(ni6, m, &ifp);
if ((replylen += addrs * sizeof(struct in6_addr)) > MCLBYTES)
replylen = MCLBYTES;
break;
default:
qtype = NI_QTYPE_FQDN;
replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_name) +
hostnamelen;
break;
}
MGETHDR(n, M_DONTWAIT, m->m_type);
if (n == NULL) {
m_freem(m);
return(NULL);
}
M_COPY_PKTHDR(n, m);
if (replylen > MHLEN) {
if (replylen > MCLBYTES)
goto bad;
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
goto bad;
}
}
n->m_pkthdr.len = n->m_len = replylen;
bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
switch (qtype) {
case NI_QTYPE_NOOP:
nni6->ni_flags = 0;
break;
case NI_QTYPE_SUPTYPES:
goto bad;
break;
case NI_QTYPE_FQDN:
if (hostnamelen > 255) {
printf("ni6_input: "
"hostname length(%d) is too large for reply\n",
hostnamelen);
goto bad;
}
fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
sizeof(struct ip6_hdr) +
sizeof(struct icmp6_nodeinfo));
nni6->ni_flags = 0;
fqdn->ni_fqdn_ttl = 0;
fqdn->ni_fqdn_namelen = hostnamelen;
bcopy(hostname, &fqdn->ni_fqdn_name[0], hostnamelen);
break;
case NI_QTYPE_NODEADDR:
{
int lenlim, copied;
if (n->m_flags & M_EXT)
lenlim = MCLBYTES - sizeof(struct ip6_hdr) -
sizeof(struct icmp6_nodeinfo);
else
lenlim = MHLEN - sizeof(struct ip6_hdr) -
sizeof(struct icmp6_nodeinfo);
copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
sizeof(struct icmp6_nodeinfo) + copied;
break;
}
default:
break;
}
nni6->ni_type = ICMP6_NI_REPLY;
nni6->ni_code = ICMP6_NI_SUCESS;
m_freem(m);
return(n);
bad:
m_freem(m);
if (n)
m_freem(n);
return(NULL);
}
#undef hostnamelen
static int
ni6_addrs(ni6, m, ifpp)
struct icmp6_nodeinfo *ni6;
struct mbuf *m;
struct ifnet **ifpp;
{
register struct ifnet *ifp;
register struct in6_ifaddr *ifa6;
register struct ifaddr *ifa;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
int addrs = 0, addrsofif, iffound = 0;
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
for (ifp = ifnet; ifp; ifp = ifp->if_next)
#else
for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
#endif
{
addrsofif = 0;
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
#else
for (ifa = ifp->if_addrlist.tqh_first; ifa;
ifa = ifa->ifa_list.tqe_next)
#endif
{
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifa6 = (struct in6_ifaddr *)ifa;
if (!(ni6->ni_flags & NI_NODEADDR_FLAG_ALL) &&
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
&ifa6->ia_addr.sin6_addr))
iffound = 1;
if (ifa6->ia6_flags & IN6_IFF_ANYCAST)
continue;
if ((ni6->ni_flags & (NI_NODEADDR_FLAG_LINKLOCAL |
NI_NODEADDR_FLAG_SITELOCAL |
NI_NODEADDR_FLAG_GLOBAL)) == 0)
continue;
switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
case IPV6_ADDR_SCOPE_LINKLOCAL:
if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL)
addrsofif++;
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL)
addrsofif++;
break;
case IPV6_ADDR_SCOPE_GLOBAL:
if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL)
addrsofif++;
break;
default:
continue;
}
}
if (iffound) {
*ifpp = ifp;
return(addrsofif);
}
addrs += addrsofif;
}
return(addrs);
}
static int
ni6_store_addrs(ni6, nni6, ifp0, resid)
struct icmp6_nodeinfo *ni6, *nni6;
struct ifnet *ifp0;
int resid;
{
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
register struct ifnet *ifp = ifp0 ? ifp0 : ifnet;
#else
register struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
#endif
register struct in6_ifaddr *ifa6;
register struct ifaddr *ifa;
int docopy, copied = 0;
u_char *cp = (u_char *)(nni6 + 1);
if (ifp0 == NULL && !(ni6->ni_flags & NI_NODEADDR_FLAG_ALL))
return(0);
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
for (; ifp; ifp = ifp->if_next)
#else
for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
#endif
{
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
#else
for (ifa = ifp->if_addrlist.tqh_first; ifa;
ifa = ifa->ifa_list.tqe_next)
#endif
{
docopy = 0;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifa6 = (struct in6_ifaddr *)ifa;
if (ifa6->ia6_flags & IN6_IFF_ANYCAST) {
if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST)
docopy = 1;
else
continue;
}
else {
if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST)
continue;
else
docopy = 1;
}
switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
case IPV6_ADDR_SCOPE_LINKLOCAL:
if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL)
docopy = 1;
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL)
docopy = 1;
break;
case IPV6_ADDR_SCOPE_GLOBAL:
if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL)
docopy = 1;
break;
default:
continue;
}
if (docopy) {
if (resid < sizeof(struct in6_addr)) {
nni6->ni_flags |=
NI_NODEADDR_FLAG_TRUNCATE;
return(copied);
}
bcopy(&ifa6->ia_addr.sin6_addr, cp,
sizeof(struct in6_addr));
if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
((struct in6_addr *)cp)->s6_addr16[1] = 0;
cp += sizeof(struct in6_addr);
resid -= sizeof(struct in6_addr);
copied += sizeof(struct in6_addr);
}
}
if (ifp0)
break;
}
return(copied);
}
#ifndef HAVE_NRL_INPCB
static int
icmp6_rip6_input(mp, off)
struct mbuf **mp;
int off;
{
struct mbuf *m = *mp;
register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
register struct in6pcb *in6p;
struct in6pcb *last = NULL;
struct sockaddr_in6 rip6src;
struct icmp6_hdr *icmp6;
struct ip6_recvpktopts opts;
#ifndef PULLDOWN_TEST
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
if (icmp6 == NULL) {
return IPPROTO_DONE;
}
#endif
bzero(&opts, sizeof(opts));
bzero(&rip6src, sizeof(rip6src));
rip6src.sin6_len = sizeof(struct sockaddr_in6);
rip6src.sin6_family = AF_INET6;
rip6src.sin6_addr = ip6->ip6_src;
if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
rip6src.sin6_addr.s6_addr16[1] = 0;
if (m->m_pkthdr.rcvif) {
if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr))
rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index;
else
rip6src.sin6_scope_id = 0;
} else
rip6src.sin6_scope_id = 0;
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
LIST_FOREACH(in6p, &ripcb, inp_list)
#else
for (in6p = rawin6pcb.in6p_next;
in6p != &rawin6pcb; in6p = in6p->in6p_next)
#endif
{
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
if ((in6p->inp_vflag & INP_IPV6) == NULL)
continue;
#endif
if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
continue;
if (in6p->in6p_icmp6filt
&& ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
in6p->in6p_icmp6filt))
continue;
if (last) {
struct mbuf *n;
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
if (last->in6p_flags & IN6P_CONTROLOPTS)
ip6_savecontrol(last, ip6, n, &opts,
NULL);
m_adj(n, off);
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&rip6src,
n, opts.head) == 0) {
m_freem(n);
if (opts.head) {
m_freem(opts.head);
}
} else
sorwakeup(last->in6p_socket);
bzero(&opts, sizeof(opts));
}
}
last = in6p;
}
if (last) {
if (last->in6p_flags & IN6P_CONTROLOPTS)
ip6_savecontrol(last, ip6, m, &opts, NULL);
m_adj(m, off);
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&rip6src,
m, opts.head) == 0) {
m_freem(m);
if (opts.head)
m_freem(opts.head);
} else
sorwakeup(last->in6p_socket);
} else {
m_freem(m);
ip6stat.ip6s_delivered--;
}
return IPPROTO_DONE;
}
#endif
void
icmp6_reflect(m, off)
struct mbuf *m;
size_t off;
{
struct ip6_hdr *ip6;
struct icmp6_hdr *icmp6;
struct in6_ifaddr *ia;
struct in6_addr t, *src = 0;
int plen;
int type, code;
struct ifnet *outif = NULL;
#ifdef COMPAT_RFC1885
int mtu = IPV6_MMTU;
struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
#endif
if (off < sizeof(struct ip6_hdr)) {
printf("sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
(u_long)off, (u_long)sizeof(struct ip6_hdr),
__FILE__, __LINE__);
goto bad;
}
if (off > sizeof(struct ip6_hdr)) {
size_t l;
struct ip6_hdr nip6;
l = off - sizeof(struct ip6_hdr);
m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
m_adj(m, l);
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
if (m->m_len < l) {
if ((m = m_pullup(m, l)) == NULL)
return;
}
bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
} else {
size_t l;
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
if (m->m_len < l) {
if ((m = m_pullup(m, l)) == NULL)
return;
}
}
plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_nxt = IPPROTO_ICMPV6;
icmp6 = (struct icmp6_hdr *)(ip6 + 1);
type = icmp6->icmp6_type;
code = icmp6->icmp6_code;
t = ip6->ip6_dst;
ip6->ip6_dst = ip6->ip6_src;
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1] =
htons(m->m_pkthdr.rcvif->if_index);
if (IN6_IS_ADDR_LINKLOCAL(&t))
t.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
#ifdef COMPAT_RFC1885
if (icmp6_reflect_rt.ro_rt == 0 ||
! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
if (icmp6_reflect_rt.ro_rt) {
#if defined(__FreeBSD__) || defined(__APPLE__)
RTFREE(icmp6_reflect_rt.ro_rt);
#endif
#ifdef __bsdi__
rtfree(icmp6_reflect_rt.ro_rt);
#endif
icmp6_reflect_rt.ro_rt = 0;
}
bzero(sin6, sizeof(*sin6));
sin6->sin6_family = PF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_addr = ip6->ip6_dst;
#if defined(__FreeBSD__) || defined(__APPLE__)
rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
RTF_PRCLONING);
#else
rtalloc((struct route *)&icmp6_reflect_rt.ro_rt);
#endif
}
if (icmp6_reflect_rt.ro_rt == 0)
goto bad;
if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
&& mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
if (mtu < m->m_pkthdr.len) {
plen -= (m->m_pkthdr.len - mtu);
m_adj(m, mtu - m->m_pkthdr.len);
}
#endif
for (ia = in6_ifaddr; ia; ia = ia->ia_next)
if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
(ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
src = &t;
break;
}
if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
src = &t;
}
if (src == 0)
if ((ia = in6_ifawithscope(m->m_pkthdr.rcvif, &t)) != 0)
src = &IA6_SIN6(ia)->sin6_addr;
if (src == 0)
goto bad;
ip6->ip6_src = *src;
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_nxt = IPPROTO_ICMPV6;
if (m->m_pkthdr.rcvif) {
ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
}
icmp6->icmp6_cksum = 0;
icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
sizeof(struct ip6_hdr), plen);
m->m_flags &= ~(M_BCAST|M_MCAST);
#if IPSEC
ipsec_setsocket(m, NULL);
#endif
#ifdef COMPAT_RFC1885
ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif);
#else
ip6_output(m, NULL, NULL, 0, NULL, &outif);
#endif
if (outif)
icmp6_ifoutstat_inc(outif, type, code);
return;
bad:
m_freem(m);
return;
}
void
icmp6_fasttimo()
{
mld6_fasttimeo();
}
static const char *
icmp6_redirect_diag(src6, dst6, tgt6)
struct in6_addr *src6;
struct in6_addr *dst6;
struct in6_addr *tgt6;
{
static char buf[1024];
#if !defined(__OpenBSD__) && !defined(__bsdi__)
snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
#else
sprintf(buf, "(src=%s dst=%s tgt=%s)",
ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
#endif
return buf;
}
void
icmp6_redirect_input(m, off)
register struct mbuf *m;
int off;
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_redirect *nd_rd;
int icmp6len = ntohs(ip6->ip6_plen);
char *lladdr = NULL;
int lladdrlen = 0;
u_char *redirhdr = NULL;
int redirhdrlen = 0;
struct rtentry *rt = NULL;
int is_router;
int is_onlink;
struct in6_addr src6 = ip6->ip6_src;
struct in6_addr redtgt6;
struct in6_addr reddst6;
union nd_opts ndopts;
if (!m || !ifp)
return;
if (ip6_forwarding)
goto freeit;
if (!icmp6_rediraccept)
goto freeit;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len,);
nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
if (nd_rd == NULL) {
icmp6stat.icp6s_tooshort++;
return;
}
#endif
redtgt6 = nd_rd->nd_rd_target;
reddst6 = nd_rd->nd_rd_dst;
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
redtgt6.s6_addr16[1] = htons(ifp->if_index);
if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
reddst6.s6_addr16[1] = htons(ifp->if_index);
if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
log(LOG_ERR,
"ICMP6 redirect sent from %s rejected; "
"must be from linklocal\n", ip6_sprintf(&src6));
goto freeit;
}
if (ip6->ip6_hlim != 255) {
log(LOG_ERR,
"ICMP6 redirect sent from %s rejected; "
"hlim=%d (must be 255)\n",
ip6_sprintf(&src6), ip6->ip6_hlim);
goto freeit;
}
{
struct sockaddr_in6 sin6;
struct in6_addr *gw6;
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
rt = rtalloc1((struct sockaddr *)&sin6, 0
#if defined(__FreeBSD__) || defined (__APPLE__)
, 0UL
#endif
);
if (rt) {
gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
log(LOG_ERR,
"ICMP6 redirect rejected; "
"not equal to gw-for-src=%s (must be same): "
"%s\n",
ip6_sprintf(gw6),
icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
RTFREE(rt);
goto freeit;
}
} else {
log(LOG_ERR,
"ICMP6 redirect rejected; "
"no route found for redirect dst: %s\n",
icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
goto freeit;
}
RTFREE(rt);
rt = NULL;
}
if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
log(LOG_ERR,
"ICMP6 redirect rejected; "
"redirect dst must be unicast: %s\n",
icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
goto freeit;
}
is_router = is_onlink = 0;
if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
is_router = 1;
if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
is_onlink = 1;
if (!is_router && !is_onlink) {
log(LOG_ERR,
"ICMP6 redirect rejected; "
"neither router case nor onlink case: %s\n",
icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
goto freeit;
}
icmp6len -= sizeof(*nd_rd);
nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
log(LOG_INFO, "icmp6_redirect_input: "
"invalid ND option, rejected: %s\n",
icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
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;
}
if (ndopts.nd_opts_rh) {
redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
redirhdr = (u_char *)(ndopts.nd_opts_rh + 1);
}
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
log(LOG_INFO,
"icmp6_redirect_input: lladdrlen mismatch for %s "
"(if %d, icmp6 packet %d): %s\n",
ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
}
nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
if (!is_onlink) {
struct sockaddr_in6 sdst;
struct sockaddr_in6 sgw;
struct sockaddr_in6 ssrc;
#ifdef __bsdi__
extern int icmp_redirtimeout;
#endif
bzero(&sdst, sizeof(sdst));
bzero(&sgw, sizeof(sgw));
bzero(&ssrc, sizeof(ssrc));
sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
sizeof(struct sockaddr_in6);
bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
(struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
(struct sockaddr *)&ssrc,
#ifdef __bsdi__
icmp_redirtimeout
#else
(struct rtentry **)NULL
#endif
);
}
{
struct sockaddr_in6 sdst;
#if 1
#else
struct ip6protosw *pr;
#endif
bzero(&sdst, sizeof(sdst));
sdst.sin6_family = AF_INET6;
sdst.sin6_len = sizeof(struct sockaddr_in6);
bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
#if 1
pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
#else
for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW;
pr++) {
if (pr->pr_ctlinput) {
(*pr->pr_ctlinput)(PRC_REDIRECT_HOST,
(struct sockaddr *)&sdst, NULL, NULL, 0);
}
}
#endif
#if IPSEC
key_sa_routechange((struct sockaddr *)&sdst);
#endif
}
freeit:
m_freem(m);
}
void
icmp6_redirect_output(m0, rt)
struct mbuf *m0;
struct rtentry *rt;
{
struct ifnet *ifp;
struct in6_addr *ifp_ll6;
struct in6_addr *router_ll6;
struct ip6_hdr *sip6;
struct mbuf *m = NULL;
struct ip6_hdr *ip6;
struct nd_redirect *nd_rd;
size_t maxlen;
u_char *p;
struct ifnet *outif = NULL;
if (!ip6_forwarding || ip6_accept_rtadv)
goto fail;
if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
goto fail;
sip6 = mtod(m0, struct ip6_hdr *);
if (nd6_is_addr_neighbor(&sip6->ip6_src, ifp) == 0)
goto fail;
if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
goto fail;
if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
goto fail;
#if IPV6_MMTU >= MCLBYTES
# error assumption failed about IPV6_MMTU and MCLBYTES
#endif
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m && IPV6_MMTU >= MHLEN)
MCLGET(m, M_DONTWAIT);
if (!m)
goto fail;
maxlen = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN;
maxlen = min(IPV6_MMTU, maxlen);
if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
goto fail;
}
{
struct in6_ifaddr *ia;
if ((ia = in6ifa_ifpforlinklocal(ifp,
IN6_IFF_NOTREADY|
IN6_IFF_ANYCAST)) == NULL)
goto fail;
ifp_ll6 = &ia->ia_addr.sin6_addr;
}
if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
router_ll6 = &sin6->sin6_addr;
if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
router_ll6 = (struct in6_addr *)NULL;
} else
router_ll6 = (struct in6_addr *)NULL;
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;
bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
nd_rd = (struct nd_redirect *)(ip6 + 1);
nd_rd->nd_rd_type = ND_REDIRECT;
nd_rd->nd_rd_code = 0;
nd_rd->nd_rd_reserved = 0;
if (rt->rt_flags & RTF_GATEWAY) {
if (!router_ll6)
goto fail;
bcopy(router_ll6, &nd_rd->nd_rd_target,
sizeof(nd_rd->nd_rd_target));
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
sizeof(nd_rd->nd_rd_dst));
} else {
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
sizeof(nd_rd->nd_rd_target));
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
sizeof(nd_rd->nd_rd_dst));
}
p = (u_char *)(nd_rd + 1);
if (!router_ll6)
goto nolladdropt;
{
struct rtentry *rt_router = NULL;
int len;
struct sockaddr_dl *sdl;
struct nd_opt_hdr *nd_opt;
char *lladdr;
rt_router = nd6_lookup(router_ll6, 0, ifp);
if (!rt_router)
goto nolladdropt;
len = sizeof(*nd_opt) + ifp->if_addrlen;
len = (len + 7) & ~7;
if (len + (p - (u_char *)ip6) > maxlen)
goto nolladdropt;
if (!(rt_router->rt_flags & RTF_GATEWAY) &&
(rt_router->rt_flags & RTF_LLINFO) &&
(rt_router->rt_gateway->sa_family == AF_LINK) &&
(sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
sdl->sdl_alen) {
nd_opt = (struct nd_opt_hdr *)p;
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
nd_opt->nd_opt_len = len >> 3;
lladdr = (char *)(nd_opt + 1);
bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
p += len;
}
}
nolladdropt:;
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
#if M_DECRYPTED
if (m0->m_flags & M_DECRYPTED)
goto noredhdropt;
#endif
if (p - (u_char *)ip6 > maxlen)
goto noredhdropt;
{
int len;
struct nd_opt_rd_hdr *nd_opt_rh;
len = maxlen - (p - (u_char *)ip6);
len &= ~7;
if (m0->m_pkthdr.len != m0->m_len) {
if (m0->m_next) {
m_freem(m0->m_next);
m0->m_next = NULL;
}
m0->m_pkthdr.len = m0->m_len;
}
if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
} else {
size_t extra;
extra = m0->m_pkthdr.len % 8;
if (extra) {
if (8 - extra <= M_TRAILINGSPACE(m0)) {
m0->m_len += (8 - extra);
m0->m_pkthdr.len += (8 - extra);
} else {
m0->m_pkthdr.len -= extra;
m0->m_len -= extra;
}
}
len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
}
nd_opt_rh = (struct nd_opt_rd_hdr *)p;
bzero(nd_opt_rh, sizeof(*nd_opt_rh));
nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
nd_opt_rh->nd_opt_rh_len = len >> 3;
p += sizeof(*nd_opt_rh);
m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
m->m_next = m0;
m->m_pkthdr.len = m->m_len + m0->m_len;
}
noredhdropt:;
if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
sip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
sip6->ip6_dst.s6_addr16[1] = 0;
#if 0
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1] = 0;
#endif
if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
nd_rd->nd_rd_target.s6_addr16[1] = 0;
if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
nd_rd->nd_rd_dst.s6_addr16[1] = 0;
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
nd_rd->nd_rd_cksum = 0;
nd_rd->nd_rd_cksum
= in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
#if IPSEC
ipsec_setsocket(m, NULL);
#endif
ip6_output(m, NULL, NULL, 0, NULL, &outif);
if (outif) {
icmp6_ifstat_inc(outif, ifs6_out_msg);
icmp6_ifstat_inc(outif, ifs6_out_redirect);
}
icmp6stat.icp6s_outhist[ND_REDIRECT]++;
return;
fail:
if (m)
m_freem(m);
if (m0)
m_freem(m0);
}
#ifndef HAVE_NRL_INPCB
int
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
icmp6_ctloutput(so, sopt)
struct socket *so;
struct sockopt *sopt;
#else
icmp6_ctloutput(op, so, level, optname, mp)
int op;
struct socket *so;
int level, optname;
struct mbuf **mp;
#endif
{
int error = 0;
int optlen;
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
register struct inpcb *inp = sotoinpcb(so);
int level, op, optname;
if (sopt) {
level = sopt->sopt_level;
op = sopt->sopt_dir;
optname = sopt->sopt_name;
optlen = sopt->sopt_valsize;
} else
level = op = optname = optlen = 0;
#else
register struct in6pcb *in6p = sotoin6pcb(so);
register struct mbuf *m = *mp;
optlen = m ? m->m_len : 0;
#endif
if (level != IPPROTO_ICMPV6) {
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
if (op == PRCO_SETOPT && m)
(void)m_free(m);
#endif
return EINVAL;
}
switch(op) {
case PRCO_SETOPT:
switch (optname) {
case ICMP6_FILTER:
{
struct icmp6_filter *p;
if (optlen != sizeof(*p)) {
error = EMSGSIZE;
break;
}
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
if (inp->in6p_icmp6filt == NULL) {
error = EINVAL;
break;
}
error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
optlen);
#else
p = mtod(m, struct icmp6_filter *);
if (!p || !in6p->in6p_icmp6filt) {
error = EINVAL;
break;
}
bcopy(p, in6p->in6p_icmp6filt,
sizeof(struct icmp6_filter));
error = 0;
#endif
break;
}
default:
error = ENOPROTOOPT;
break;
}
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
if (m)
(void)m_freem(m);
#endif
break;
case PRCO_GETOPT:
switch (optname) {
case ICMP6_FILTER:
{
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
if (inp->in6p_icmp6filt == NULL) {
error = EINVAL;
break;
}
error = sooptcopyout(sopt, inp->in6p_icmp6filt,
sizeof(struct icmp6_filter));
#else
struct icmp6_filter *p;
if (!in6p->in6p_icmp6filt) {
error = EINVAL;
break;
}
*mp = m = m_get(M_WAIT, MT_SOOPTS);
m->m_len = sizeof(struct icmp6_filter);
p = mtod(m, struct icmp6_filter *);
bcopy(in6p->in6p_icmp6filt, p,
sizeof(struct icmp6_filter));
error = 0;
#endif
break;
}
default:
error = ENOPROTOOPT;
break;
}
break;
}
return(error);
}
#endif
static int
icmp6_ratelimit(dst, type, code)
const struct in6_addr *dst;
const int type;
const int code;
{
struct timeval tp;
long sec_diff, usec_diff;
if (!icmp6errratelim)
return 0;
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
microtime(&tp);
tp.tv_sec = time_second;
#else
tp = time;
#endif
if (tp.tv_sec < icmp6_nextsend.tv_sec
|| (tp.tv_sec == icmp6_nextsend.tv_sec
&& tp.tv_usec < icmp6_nextsend.tv_usec)) {
return 1;
}
sec_diff = icmp6errratelim / 1000000;
usec_diff = icmp6errratelim % 1000000;
icmp6_nextsend.tv_sec = tp.tv_sec + sec_diff;
if ((tp.tv_usec = tp.tv_usec + usec_diff) >= 1000000) {
icmp6_nextsend.tv_sec++;
icmp6_nextsend.tv_usec -= 1000000;
}
return 0;
}
#if defined(__NetBSD__) || defined(__OpenBSD__)
static struct rtentry *
icmp6_mtudisc_clone(dst)
struct sockaddr *dst;
{
struct rtentry *rt;
int error;
rt = rtalloc1(dst, 1);
if (rt == 0)
return NULL;
if ((rt->rt_flags & RTF_HOST) == 0) {
struct rtentry *nrt;
error = rtrequest((int) RTM_ADD, dst,
(struct sockaddr *) rt->rt_gateway,
(struct sockaddr *) 0,
RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
if (error) {
rtfree(rt);
rtfree(nrt);
return NULL;
}
nrt->rt_rmx = rt->rt_rmx;
rtfree(rt);
rt = nrt;
}
error = rt_timer_add(rt, icmp6_mtudisc_timeout,
icmp6_mtudisc_timeout_q);
if (error) {
rtfree(rt);
return NULL;
}
return rt;
}
static void
icmp6_mtudisc_timeout(rt, r)
struct rtentry *rt;
struct rttimer *r;
{
if (rt == NULL)
panic("icmp6_mtudisc_timeout: bad route to timeout");
if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
(RTF_DYNAMIC | RTF_HOST)) {
rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
} else {
if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) {
rt->rt_rmx.rmx_mtu = 0;
}
}
}
#endif
#ifdef __bsdi__
void
icmp6_mtuexpire(rt, rtt)
struct rtentry *rt;
struct rttimer *rtt;
{
rt->rt_flags |= RTF_PROBEMTU;
Free(rtt);
}
int *icmp6_sysvars[] = ICMPV6CTL_VARS;
int
icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
if (name[0] >= ICMPV6CTL_MAXID)
return (EOPNOTSUPP);
switch (name[0]) {
#if 0
ICMPV6CTL_ND6_PRUNE:
ICMPV6CTL_ND6_DELAY:
ICMPV6CTL_ND6_UMAXTRIES:
ICMPV6CTL_ND6_MMAXTRIES:
ICMPV6CTL_ND6_USELOOPBACK:
#endif
case ICMPV6CTL_STATS:
return sysctl_rdtrunc(oldp, oldlenp, newp, &icmp6stat,
sizeof(icmp6stat));
default:
return (sysctl_int_arr(icmp6_sysvars, name, namelen,
oldp, oldlenp, newp, newlen));
}
}
#endif
#if defined(__NetBSD__) || defined(__OpenBSD__)
#include <vm/vm.h>
#include <sys/sysctl.h>
int
icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
if (namelen != 1)
return ENOTDIR;
switch (name[0]) {
case ICMPV6CTL_REDIRACCEPT:
return sysctl_int(oldp, oldlenp, newp, newlen,
&icmp6_rediraccept);
case ICMPV6CTL_REDIRTIMEOUT:
return sysctl_int(oldp, oldlenp, newp, newlen,
&icmp6_redirtimeout);
case ICMPV6CTL_STATS:
return sysctl_rdstruct(oldp, oldlenp, newp,
&icmp6stat, sizeof(icmp6stat));
case ICMPV6CTL_ERRRATELIMIT:
return sysctl_int(oldp, oldlenp, newp, newlen,
&icmp6errratelim);
case ICMPV6CTL_ND6_PRUNE:
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune);
case ICMPV6CTL_ND6_DELAY:
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay);
case ICMPV6CTL_ND6_UMAXTRIES:
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries);
case ICMPV6CTL_ND6_MMAXTRIES:
return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries);
case ICMPV6CTL_ND6_USELOOPBACK:
return sysctl_int(oldp, oldlenp, newp, newlen,
&nd6_useloopback);
case ICMPV6CTL_NODEINFO:
return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo);
default:
return ENOPROTOOPT;
}
}
#endif