#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/mcache.h>
#include <mach/mach_time.h>
#include <pexpert/pexpert.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/kpi_protocol.h>
#include <net/ntstat.h>
#include <net/init.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#if INET
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#endif
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet/in_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/nd6.h>
#include <netinet6/scope6_var.h>
#include <mach/sdt.h>
#if IPSEC
#include <netinet6/ipsec.h>
#if INET6
#include <netinet6/ipsec6.h>
#endif
extern int ipsec_bypass;
#endif
#include <netinet6/ip6_fw.h>
#if DUMMYNET
#include <netinet/ip_fw.h>
#include <netinet/ip_dummynet.h>
#endif
#include <netinet/kpi_ipfilter_var.h>
#include <netinet6/ip6protosw.h>
#include "loop.h"
#include <net/net_osdep.h>
#if PF
#include <net/pfvar.h>
#endif
extern struct domain inet6domain;
extern struct ip6protosw inet6sw[];
struct ip6protosw * ip6_protox[IPPROTO_MAX];
static int ip6qmaxlen = IFQ_MAXLEN;
static lck_grp_attr_t *in6_ifaddr_rwlock_grp_attr;
static lck_grp_t *in6_ifaddr_rwlock_grp;
static lck_attr_t *in6_ifaddr_rwlock_attr;
decl_lck_rw_data(, in6_ifaddr_rwlock);
struct in6_ifaddr *in6_ifaddrs = NULL;
int ip6_forward_srcrt;
int ip6_sourcecheck;
int ip6_sourcecheck_interval;
const int int6intrq_present = 1;
int ip6_ours_check_algorithm;
#define IN6_IFSTAT_REQUIRE_ALIGNED_64(f) \
_CASSERT(!(offsetof(struct in6_ifstat, f) % sizeof (uint64_t)))
#define ICMP6_IFSTAT_REQUIRE_ALIGNED_64(f) \
_CASSERT(!(offsetof(struct icmp6_ifstat, f) % sizeof (uint64_t)))
#if IPFW2
ip6_fw_chk_t *ip6_fw_chk_ptr;
ip6_fw_ctl_t *ip6_fw_ctl_ptr;
int ip6_fw_enable = 1;
#endif
struct ip6stat ip6stat;
#ifdef __APPLE__
struct ifqueue ip6intrq;
decl_lck_mtx_data(, ip6_init_mutex);
decl_lck_mtx_data(, proxy6_lock);
decl_lck_mtx_data(, dad6_mutex_data);
decl_lck_mtx_data(, nd6_mutex_data);
decl_lck_mtx_data(, prefix6_mutex_data);
decl_lck_mtx_data(, scope6_mutex_data);
lck_mtx_t *dad6_mutex = &dad6_mutex_data;
lck_mtx_t *nd6_mutex = &nd6_mutex_data;
lck_mtx_t *prefix6_mutex = &prefix6_mutex_data;
lck_mtx_t *scope6_mutex = &scope6_mutex_data;
#ifdef ENABLE_ADDRSEL
decl_lck_mtx_data(, addrsel_mutex_data);
lck_mtx_t *addrsel_mutex = &addrsel_mutex_data;
#endif
decl_lck_rw_data(, in6_ifs_rwlock);
decl_lck_rw_data(, icmp6_ifs_rwlock);
lck_attr_t *ip6_mutex_attr;
lck_grp_t *ip6_mutex_grp;
lck_grp_attr_t *ip6_mutex_grp_attr;
extern lck_mtx_t *inet6_domain_mutex;
#endif
extern int loopattach_done;
extern void addrsel_policy_init(void);
static void ip6_init_delayed(void);
static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *);
static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
#if PULLDOWN_TEST
static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
#endif
#ifdef __APPLE__
void gifattach(void);
void stfattach(void);
#endif
SYSCTL_DECL(_net_inet6_ip6);
int ip6_doscopedroute = 1;
SYSCTL_INT(_net_inet6_ip6, OID_AUTO, scopedroute, CTLFLAG_RD | CTLFLAG_LOCKED,
&ip6_doscopedroute, 0, "Enable IPv6 scoped routing");
int ip6_restrictrecvif = 1;
SYSCTL_INT(_net_inet6_ip6, OID_AUTO, restrictrecvif,
CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_restrictrecvif, 0,
"Enable inbound interface restrictions");
#if defined(__i386__) || defined(__x86_64__)
#define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { } while (0)
#else
#define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { \
if (!IP6_HDR_ALIGNED_P(mtod(_m, caddr_t))) { \
struct mbuf *_n; \
struct ifnet *__ifp = (_ifp); \
atomic_add_64(&(__ifp)->if_alignerrs, 1); \
if (((_m)->m_flags & M_PKTHDR) && \
(_m)->m_pkthdr.header != NULL) \
(_m)->m_pkthdr.header = NULL; \
_n = m_defrag_offset(_m, max_linkhdr, M_NOWAIT); \
if (_n == NULL) { \
ip6stat.ip6s_toosmall++; \
m_freem(_m); \
(_m) = NULL; \
_action \
} else { \
VERIFY(_n != (_m)); \
(_m) = _n; \
} \
} \
} while (0)
#endif
static void
ip6_proto_input(
__unused protocol_family_t protocol,
mbuf_t packet)
{
ip6_input(packet);
}
void
ip6_init()
{
struct ip6protosw *pr;
int i;
struct timeval tv;
PE_parse_boot_argn("net.inet6.ip6.scopedroute", &ip6_doscopedroute,
sizeof (ip6_doscopedroute));
#if DIAGNOSTIC
if (sizeof(struct protosw) != sizeof(struct ip6protosw))
panic("sizeof(protosw) != sizeof(ip6protosw)");
#endif
pr = (struct ip6protosw *)pffindproto_locked(PF_INET6, IPPROTO_RAW, SOCK_RAW);
if (pr == 0)
panic("ip6_init");
for (i = 0; i < IPPROTO_MAX; i++)
ip6_protox[i] = pr;
for (pr = (struct ip6protosw*)inet6domain.dom_protosw; pr; pr = pr->pr_next) {
if(!(pr->pr_domain)) continue;
if (pr->pr_domain->dom_family == PF_INET6 &&
pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
ip6_protox[pr->pr_protocol] = pr;
}
}
ip6_mutex_grp_attr = lck_grp_attr_alloc_init();
ip6_mutex_grp = lck_grp_alloc_init("ip6", ip6_mutex_grp_attr);
ip6_mutex_attr = lck_attr_alloc_init();
lck_mtx_init(dad6_mutex, ip6_mutex_grp, ip6_mutex_attr);
lck_mtx_init(nd6_mutex, ip6_mutex_grp, ip6_mutex_attr);
lck_mtx_init(prefix6_mutex, ip6_mutex_grp, ip6_mutex_attr);
lck_mtx_init(scope6_mutex, ip6_mutex_grp, ip6_mutex_attr);
#ifdef ENABLE_ADDRSEL
lck_mtx_init(addrsel_mutex, ip6_mutex_grp, ip6_mutex_attr);
#endif
lck_mtx_init(&proxy6_lock, ip6_mutex_grp, ip6_mutex_attr);
lck_mtx_init(&ip6_init_mutex, ip6_mutex_grp, ip6_mutex_attr);
lck_rw_init(&in6_ifs_rwlock, ip6_mutex_grp, ip6_mutex_attr);
lck_rw_init(&icmp6_ifs_rwlock, ip6_mutex_grp, ip6_mutex_attr);
inet6domain.dom_flags = DOM_REENTRANT;
ip6intrq.ifq_maxlen = ip6qmaxlen;
in6_ifaddr_rwlock_grp_attr = lck_grp_attr_alloc_init();
in6_ifaddr_rwlock_grp = lck_grp_alloc_init("in6_ifaddr_rwlock",
in6_ifaddr_rwlock_grp_attr);
in6_ifaddr_rwlock_attr = lck_attr_alloc_init();
lck_rw_init(&in6_ifaddr_rwlock, in6_ifaddr_rwlock_grp,
in6_ifaddr_rwlock_attr);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_receive);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_hdrerr);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_toobig);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_noroute);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_addrerr);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_protounknown);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_truncated);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_discard);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_deliver);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_forward);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_request);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_discard);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragok);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragfail);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragcreat);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_reqd);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_ok);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_fail);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mcast);
IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mcast);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_msg);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_error);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_dstunreach);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_adminprohib);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_timeexceed);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_paramprob);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_pkttoobig);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_echo);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_echoreply);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_routersolicit);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_routeradvert);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_neighborsolicit);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_neighboradvert);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_redirect);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mldquery);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mldreport);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mlddone);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_msg);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_error);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_dstunreach);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_adminprohib);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_timeexceed);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_paramprob);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_pkttoobig);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_echo);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_echoreply);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_routersolicit);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_routeradvert);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_neighborsolicit);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_neighboradvert);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_redirect);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mldquery);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mldreport);
ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mlddone);
in6_ifaddr_init();
ip6_moptions_init();
nd6_init();
frag6_init();
icmp6_init();
addrsel_policy_init();
microtime(&tv);
ip6_flow_seq = random() ^ tv.tv_usec;
microtime(&tv);
ip6_desync_factor = (random() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
net_init_add(ip6_init_delayed);
domain_proto_mtx_unlock(TRUE);
proto_register_input(PF_INET6, ip6_proto_input, NULL, 0);
domain_proto_mtx_lock();
}
static void
ip6_init_delayed(void)
{
(void) in6_ifattach(lo_ifp, NULL, NULL);
#ifdef __APPLE__
timeout(nd6_timer, (caddr_t)0, hz);
timeout(in6_tmpaddrtimer, (caddr_t)0,
(ip6_temp_preferred_lifetime - ip6_desync_factor -
ip6_temp_regen_advance) * hz);
#if NGIF
gifattach();
#endif
#if NSTF
stfattach();
#endif
#endif
}
void
ip6_input(struct mbuf *m)
{
struct ip6_hdr *ip6;
int off = sizeof(struct ip6_hdr), nest;
u_int32_t plen;
u_int32_t rtalert = ~0;
int nxt = 0, ours = 0;
struct ifnet *deliverifp = NULL;
ipfilter_t inject_ipfref = 0;
int seen;
struct in6_ifaddr *ia6 = NULL;
struct route_in6 ip6_forward_rt;
struct sockaddr_in6 *dst6;
#if DUMMYNET
struct m_tag *tag;
struct ip_fw_args args;
bzero(&args, sizeof(struct ip_fw_args));
#endif
bzero(&ip6_forward_rt, sizeof(ip6_forward_rt));
MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif);
IP6_HDR_ALIGNMENT_FIXUP(m, m->m_pkthdr.rcvif, return;);
#if DUMMYNET
if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) {
struct dn_pkt_tag *dn_tag;
dn_tag = (struct dn_pkt_tag *)(tag+1);
args.fwa_pf_rule = dn_tag->dn_pf_rule;
m_tag_delete(m, tag);
}
if (args.fwa_pf_rule) {
ip6 = mtod(m, struct ip6_hdr *);
goto check_with_pf;
}
#endif
inject_ipfref = ipf_get_inject_filter(m);
if (inject_ipfref != 0) {
ip6 = mtod(m, struct ip6_hdr *);
nxt = ip6->ip6_nxt;
seen = 0;
goto injectit;
} else
seen = 1;
#if IPSEC
if (m) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
#endif
ip6_delaux(m);
if (m->m_flags & M_EXT) {
if (m->m_next)
ip6stat.ip6s_mext2m++;
else
ip6stat.ip6s_mext1++;
} else {
#define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
if (m->m_next) {
if (m->m_flags & M_LOOP) {
ip6stat.ip6s_m2m[ifnet_index(lo_ifp)]++;
} else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
else
ip6stat.ip6s_m2m[0]++;
} else
ip6stat.ip6s_m1++;
#undef M2MMAX
}
lck_rw_lock_shared(nd_if_rwlock);
if (m->m_pkthdr.rcvif->if_index < nd_ifinfo_indexlim &&
(nd_ifinfo[m->m_pkthdr.rcvif->if_index].flags & ND6_IFF_IFDISABLED)) {
lck_rw_done(nd_if_rwlock);
goto bad;
}
lck_rw_done(nd_if_rwlock);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
ip6stat.ip6s_total++;
#ifndef PULLDOWN_TEST
if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
struct mbuf *n;
MGETHDR(n, M_DONTWAIT, MT_HEADER);
if (n)
M_COPY_PKTHDR(n, m);
if (n && m->m_pkthdr.len > MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_freem(n);
n = NULL;
}
}
if (n == NULL)
goto bad;
m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
n->m_len = m->m_pkthdr.len;
m_freem(m);
m = n;
}
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),
{goto done;});
#endif
if (m->m_len < sizeof(struct ip6_hdr)) {
struct ifnet *inifp;
inifp = m->m_pkthdr.rcvif;
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
ip6stat.ip6s_toosmall++;
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
goto done;
}
}
ip6 = mtod(m, struct ip6_hdr *);
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
ip6stat.ip6s_badvers++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
goto bad;
}
ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
#if IPFW2
if (ip6_fw_enable && ip6_fw_chk_ptr) {
u_short port = 0;
if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
m_freem(m);
m = NULL;
}
if (!m)
goto done;
}
#endif
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
!(m->m_flags & M_LOOP)) {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
#if 0
if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
#endif
if (nstat_collect) {
struct rtentry *rte =
ifnet_cached_rtlookup_inet6(m->m_pkthdr.rcvif,
&ip6->ip6_src);
if (rte != NULL) {
nstat_route_rx(rte, 1, m->m_pkthdr.len, 0);
rtfree(rte);
}
}
#if DUMMYNET
check_with_pf:
#endif
#if PF
if (PF_IS_ENABLED) {
int error;
#if DUMMYNET
error = pf_af_hook(m->m_pkthdr.rcvif, NULL, &m, AF_INET6, TRUE, &args);
#else
error = pf_af_hook(m->m_pkthdr.rcvif, NULL, &m, AF_INET6, TRUE, NULL);
#endif
if (error != 0 || m == NULL) {
if (m != NULL) {
panic("%s: unexpected packet %p\n", __func__, m);
}
goto done;
}
ip6 = mtod(m, struct ip6_hdr *);
}
#endif
if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
ip6->ip6_src.s6_addr16[1]) {
ip6stat.ip6s_badscope++;
goto bad;
}
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
ip6->ip6_dst.s6_addr16[1]) {
ip6stat.ip6s_badscope++;
goto bad;
}
}
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1]
= htons(m->m_pkthdr.rcvif->if_index);
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1]
= htons(m->m_pkthdr.rcvif->if_index);
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
struct in6_multi *in6m = NULL;
struct ifnet *ifp = m->m_pkthdr.rcvif;
in6_ifstat_inc(ifp, ifs6_in_mcast);
in6_multihead_lock_shared();
IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, in6m);
in6_multihead_lock_done();
if (in6m != NULL) {
IN6M_REMREF(in6m);
ours = 1;
} else if (!nd6_prproxy
#if MROUTING
&& !ip6_mrouter
#endif
) {
ip6stat.ip6s_notmember++;
ip6stat.ip6s_cantforward++;
in6_ifstat_inc(ifp, ifs6_in_discard);
goto bad;
}
deliverifp = ifp;
goto hbhcheck;
}
dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
dst6->sin6_len = sizeof(struct sockaddr_in6);
dst6->sin6_family = AF_INET6;
dst6->sin6_addr = ip6->ip6_dst;
rtalloc_scoped_ign((struct route *)&ip6_forward_rt,
RTF_PRCLONING, IFSCOPE_NONE);
if (ip6_forward_rt.ro_rt != NULL)
RT_LOCK(ip6_forward_rt.ro_rt);
#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
if (ip6_forward_rt.ro_rt != NULL &&
(ip6_forward_rt.ro_rt->rt_flags &
(RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
#if RTF_WASCLONED
!(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
#endif
#if 0
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
&rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
#endif
ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
ia6 = (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
(void)ip6_setdstifaddr(m, ia6);
RT_CONVERT_LOCK(ip6_forward_rt.ro_rt);
IFA_LOCK_SPIN(&ia6->ia_ifa);
if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
IFA_UNLOCK(&ia6->ia_ifa);
ours = 1;
deliverifp = ia6->ia_ifp;
RT_UNLOCK(ip6_forward_rt.ro_rt);
ia6 = NULL;
goto hbhcheck;
}
IFA_UNLOCK(&ia6->ia_ifa);
RT_UNLOCK(ip6_forward_rt.ro_rt);
nd6log((LOG_INFO,
"ip6_input: packet to an unready address %s->%s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst)));
ia6 = NULL;
goto bad;
}
if (ip6_forward_rt.ro_rt != NULL)
RT_UNLOCK(ip6_forward_rt.ro_rt);
if (!ip6_forwarding) {
ip6stat.ip6s_cantforward++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
goto bad;
}
hbhcheck:
if (deliverifp && (ia6 = ip6_getdstifaddr(m)) == NULL) {
ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
if (ia6) {
if (!ip6_setdstifaddr(m, ia6)) {
}
IFA_REMREF(&ia6->ia_ifa);
ia6 = NULL;
}
}
if (ia6 != NULL) {
IFA_REMREF(&ia6->ia_ifa);
ia6 = NULL;
}
plen = (u_int32_t)ntohs(ip6->ip6_plen);
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
struct ip6_hbh *hbh;
if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
#if 0
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
#endif
goto done;
}
ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_plen == 0 && plen == 0) {
ip6stat.ip6s_badoptions++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
(caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
goto done;
}
#ifndef PULLDOWN_TEST
hbh = (struct ip6_hbh *)(ip6 + 1);
#else
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
sizeof(struct ip6_hbh));
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
goto done;
}
#endif
nxt = hbh->ip6h_nxt;
if (rtalert != ~0 && ip6_forwarding) {
switch (rtalert) {
case IP6OPT_RTALERT_MLD:
ours = 1;
break;
default:
break;
}
}
} else
nxt = ip6->ip6_nxt;
if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
ip6stat.ip6s_tooshort++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
goto bad;
}
if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
if (m->m_len == m->m_pkthdr.len) {
m->m_len = sizeof(struct ip6_hdr) + plen;
m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
} else
m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
}
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
#if MROUTING
if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
ip6stat.ip6s_cantforward++;
goto bad;
}
#endif
if (!ours && nd6_prproxy) {
ours = nd6_prproxy_isours(m, ip6, NULL, IFSCOPE_NONE);
VERIFY(!ours ||
(m->m_pkthdr.aux_flags & MAUXF_PROXY_DST));
}
if (!ours)
goto bad;
} else if (!ours) {
if ((m = ip6_forward(m, &ip6_forward_rt, 0)) == NULL)
goto done;
VERIFY(ip6_forward_rt.ro_rt != NULL);
VERIFY(m->m_pkthdr.aux_flags & MAUXF_PROXY_DST);
deliverifp = ip6_forward_rt.ro_rt->rt_ifp;
ours = 1;
}
ip6 = mtod(m, struct ip6_hdr *);
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
ip6stat.ip6s_delivered++;
in6_ifstat_inc(deliverifp, ifs6_in_deliver);
injectit:
nest = 0;
IP6_HDR_ALIGNMENT_FIXUP(m, m->m_pkthdr.rcvif, return;);
while (nxt != IPPROTO_DONE) {
struct ipfilter *filter;
int (*pr_input)(struct mbuf **, int *, int);
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
ip6stat.ip6s_toomanyhdr++;
goto bad;
}
if (m->m_pkthdr.len < off) {
ip6stat.ip6s_tooshort++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
goto bad;
}
#if IPSEC
if ((ipsec_bypass == 0) &&
(ip6_protox[nxt]->pr_flags & PR_LASTHDR) != 0) {
if (ipsec6_in_reject(m, NULL)) {
IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
goto bad;
}
}
#endif
if (!TAILQ_EMPTY(&ipv6_filters)) {
ipf_ref();
TAILQ_FOREACH(filter, &ipv6_filters, ipf_link) {
if (seen == 0) {
if ((struct ipfilter *)inject_ipfref ==
filter)
seen = 1;
} else if (filter->ipf_filter.ipf_input) {
errno_t result;
result = filter->ipf_filter.ipf_input(
filter->ipf_filter.cookie,
(mbuf_t *)&m, off, nxt);
if (result == EJUSTRETURN) {
ipf_unref();
goto done;
}
if (result != 0) {
ipf_unref();
goto bad;
}
}
}
ipf_unref();
}
DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL,
struct ip6_hdr *, ip6, struct ifnet *, m->m_pkthdr.rcvif,
struct ip *, NULL, struct ip6_hdr *, ip6);
if ((pr_input = ip6_protox[nxt]->pr_input) == NULL) {
m_freem(m);
m = NULL;
nxt = IPPROTO_DONE;
} else if (!(ip6_protox[nxt]->pr_flags & PR_PROTOLOCK)) {
lck_mtx_lock(inet6_domain_mutex);
nxt = pr_input(&m, &off, nxt);
lck_mtx_unlock(inet6_domain_mutex);
} else {
nxt = pr_input(&m, &off, nxt);
}
}
done:
if (ip6_forward_rt.ro_rt != NULL)
rtfree(ip6_forward_rt.ro_rt);
return;
bad:
m_freem(m);
goto done;
}
static struct ip6aux *
ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
{
struct ip6aux *n;
n = ip6_addaux(m);
if (n != NULL) {
if (ia6 != NULL)
IFA_ADDREF(&ia6->ia_ifa);
if (n->ip6a_dstia6 != NULL)
IFA_REMREF(&n->ip6a_dstia6->ia_ifa);
n->ip6a_dstia6 = ia6;
}
return (struct ip6aux *)n;
}
struct in6_ifaddr *
ip6_getdstifaddr(m)
struct mbuf *m;
{
struct ip6aux *n;
n = ip6_findaux(m);
if (n != NULL) {
if (n->ip6a_dstia6 != NULL)
IFA_ADDREF(&n->ip6a_dstia6->ia_ifa);
return (n->ip6a_dstia6);
}
return (NULL);
}
static int
ip6_hopopts_input(uint32_t *plenp, uint32_t *rtalertp, struct mbuf **mp,
int *offp)
{
struct mbuf *m = *mp;
int off = *offp, hbhlen;
struct ip6_hbh *hbh;
u_int8_t *opt;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), return -1);
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
hbhlen = (hbh->ip6h_len + 1) << 3;
IP6_EXTHDR_CHECK(m, off, hbhlen, return -1);
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
return -1;
}
hbhlen = (hbh->ip6h_len + 1) << 3;
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
hbhlen);
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
return -1;
}
#endif
off += hbhlen;
hbhlen -= sizeof(struct ip6_hbh);
opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
hbhlen, rtalertp, plenp) < 0)
return (-1);
*offp = off;
*mp = m;
return (0);
}
int
ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
struct mbuf *m;
u_int8_t *opthead;
int hbhlen;
u_int32_t *rtalertp;
u_int32_t *plenp;
{
struct ip6_hdr *ip6;
int optlen = 0;
u_int8_t *opt = opthead;
u_int16_t rtalert_val;
u_int32_t jumboplen;
const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
switch (*opt) {
case IP6OPT_PAD1:
optlen = 1;
break;
case IP6OPT_PADN:
if (hbhlen < IP6OPT_MINLEN) {
ip6stat.ip6s_toosmall++;
goto bad;
}
optlen = *(opt + 1) + 2;
break;
case IP6OPT_ROUTER_ALERT:
if (hbhlen < IP6OPT_RTALERT_LEN) {
ip6stat.ip6s_toosmall++;
goto bad;
}
if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 1 - opthead);
return(-1);
}
optlen = IP6OPT_RTALERT_LEN;
bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
*rtalertp = ntohs(rtalert_val);
break;
case IP6OPT_JUMBO:
if (hbhlen < IP6OPT_JUMBO_LEN) {
ip6stat.ip6s_toosmall++;
goto bad;
}
if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 1 - opthead);
return(-1);
}
optlen = IP6OPT_JUMBO_LEN;
ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_plen) {
ip6stat.ip6s_badoptions++;
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt - opthead);
return(-1);
}
bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
jumboplen = (u_int32_t)htonl(jumboplen);
#if 1
if (*plenp != 0) {
ip6stat.ip6s_badoptions++;
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 2 - opthead);
return(-1);
}
#endif
if (jumboplen <= IPV6_MAXPACKET) {
ip6stat.ip6s_badoptions++;
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 2 - opthead);
return(-1);
}
*plenp = jumboplen;
break;
default:
if (hbhlen < IP6OPT_MINLEN) {
ip6stat.ip6s_toosmall++;
goto bad;
}
optlen = ip6_unknown_opt(opt, m,
erroff + opt - opthead);
if (optlen == -1) {
return(-1);
}
optlen += 2;
break;
}
}
return(0);
bad:
m_freem(m);
return(-1);
}
int
ip6_unknown_opt(uint8_t *optp, struct mbuf *m, int off)
{
struct ip6_hdr *ip6;
switch (IP6OPT_TYPE(*optp)) {
case IP6OPT_TYPE_SKIP:
return((int)*(optp + 1));
case IP6OPT_TYPE_DISCARD:
m_freem(m);
return(-1);
case IP6OPT_TYPE_FORCEICMP:
ip6stat.ip6s_badoptions++;
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
return(-1);
case IP6OPT_TYPE_ICMP:
ip6stat.ip6s_badoptions++;
ip6 = mtod(m, struct ip6_hdr *);
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
(m->m_flags & (M_BCAST|M_MCAST)))
m_freem(m);
else
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_OPTION, off);
return(-1);
}
m_freem(m);
return (-1);
}
struct mbuf **
ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
int *v4only)
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
struct timeval tv;
microtime(&tv);
mp = sbcreatecontrol_mbuf((caddr_t) &tv, sizeof(tv),
SCM_TIMESTAMP, SOL_SOCKET, mp);
if (*mp == NULL)
return NULL;
}
if ((inp->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
uint64_t time;
time = mach_absolute_time();
mp = sbcreatecontrol_mbuf((caddr_t) &time, sizeof(time),
SCM_TIMESTAMP_MONOTONIC, SOL_SOCKET, mp);
if (*mp == NULL)
return NULL;
}
if ((inp->inp_socket->so_flags & SOF_RECV_TRAFFIC_CLASS) != 0) {
int tc = m_get_traffic_class(m);
mp = sbcreatecontrol_mbuf((caddr_t) &tc, sizeof(tc),
SO_TRAFFIC_CLASS, SOL_SOCKET, mp);
if (*mp == NULL)
return (NULL);
}
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
if (v4only != NULL)
*v4only = 1;
return (mp);
}
#define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
struct in6_pktinfo pi6;
bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
in6_clearscope(&pi6.ipi6_addr);
pi6.ipi6_ifindex =
(m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
mp = sbcreatecontrol_mbuf((caddr_t) &pi6,
sizeof(struct in6_pktinfo),
IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, mp);
if (*mp == NULL)
return NULL;
}
if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
int hlim = ip6->ip6_hlim & 0xff;
mp = sbcreatecontrol_mbuf((caddr_t) &hlim, sizeof(int),
IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
IPPROTO_IPV6, mp);
if (*mp == NULL)
return NULL;
}
if (v4only != NULL)
*v4only = 0;
return (mp);
}
int
ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
{
struct mbuf **np;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
int v4only = 0;
*mp = NULL;
np = ip6_savecontrol_v4(in6p, m, mp, &v4only);
if (np == NULL)
goto no_mbufs;
mp = np;
if (v4only)
return(0);
if ((in6p->inp_flags & IN6P_TCLASS) != 0) {
u_int32_t flowinfo;
int tclass;
flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
flowinfo >>= 20;
tclass = flowinfo & 0xff;
mp = sbcreatecontrol_mbuf((caddr_t) &tclass, sizeof(tclass),
IPV6_TCLASS, IPPROTO_IPV6, mp);
if (*mp == NULL)
goto no_mbufs;
}
if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
struct ip6_hbh *hbh;
int hbhlen = 0;
#if PULLDOWN_TEST
struct mbuf *ext;
#endif
#ifndef PULLDOWN_TEST
hbh = (struct ip6_hbh *)(ip6 + 1);
hbhlen = (hbh->ip6h_len + 1) << 3;
#else
ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
ip6->ip6_nxt);
if (ext == NULL) {
ip6stat.ip6s_tooshort++;
return(0);
}
hbh = mtod(ext, struct ip6_hbh *);
hbhlen = (hbh->ip6h_len + 1) << 3;
if (hbhlen != ext->m_len) {
m_freem(ext);
ip6stat.ip6s_tooshort++;
return(0);
}
#endif
mp = sbcreatecontrol_mbuf((caddr_t)hbh, hbhlen,
IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
IPPROTO_IPV6, mp);
#if PULLDOWN_TEST
m_freem(ext);
#endif
if (*mp == NULL) {
goto no_mbufs;
}
}
}
if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
while (1) {
struct ip6_ext *ip6e = NULL;
int elen;
#if PULLDOWN_TEST
struct mbuf *ext = NULL;
#endif
switch (nxt) {
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
case IPPROTO_HOPOPTS:
case IPPROTO_AH:
break;
default:
goto loopend;
}
#ifndef PULLDOWN_TEST
if (off + sizeof(*ip6e) > m->m_len)
goto loopend;
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
if (nxt == IPPROTO_AH)
elen = (ip6e->ip6e_len + 2) << 2;
else
elen = (ip6e->ip6e_len + 1) << 3;
if (off + elen > m->m_len)
goto loopend;
#else
ext = ip6_pullexthdr(m, off, nxt);
if (ext == NULL) {
ip6stat.ip6s_tooshort++;
return(0);
}
ip6e = mtod(ext, struct ip6_ext *);
if (nxt == IPPROTO_AH)
elen = (ip6e->ip6e_len + 2) << 2;
else
elen = (ip6e->ip6e_len + 1) << 3;
if (elen != ext->m_len) {
m_freem(ext);
ip6stat.ip6s_tooshort++;
return(0);
}
#endif
switch (nxt) {
case IPPROTO_DSTOPTS:
if (!(in6p->inp_flags & IN6P_DSTOPTS))
break;
mp = sbcreatecontrol_mbuf((caddr_t)ip6e, elen,
IS2292(in6p,
IPV6_2292DSTOPTS, IPV6_DSTOPTS),
IPPROTO_IPV6, mp);
if (*mp == NULL) {
#if PULLDOWN_TEST
m_freem(ext);
#endif
goto no_mbufs;
}
break;
case IPPROTO_ROUTING:
if (!in6p->inp_flags & IN6P_RTHDR)
break;
mp = sbcreatecontrol_mbuf((caddr_t)ip6e, elen,
IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
IPPROTO_IPV6, mp);
if (*mp == NULL) {
#if PULLDOWN_TEST
m_freem(ext);
#endif
goto no_mbufs;
}
break;
case IPPROTO_HOPOPTS:
case IPPROTO_AH:
break;
default:
#if PULLDOWN_TEST
m_freem(ext);
#endif
goto loopend;
}
off += elen;
nxt = ip6e->ip6e_nxt;
ip6e = NULL;
#if PULLDOWN_TEST
m_freem(ext);
ext = NULL;
#endif
}
loopend:
;
}
return(0);
no_mbufs:
ip6stat.ip6s_pktdropcntrl++;
return(ENOBUFS);
}
#undef IS2292
void
ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
{
struct socket *so;
struct mbuf *m_mtu;
struct ip6_mtuinfo mtuctl;
so = in6p->inp_socket;
if (mtu == NULL)
return;
#ifdef DIAGNOSTIC
if (so == NULL)
panic("ip6_notify_pmtu: socket is NULL");
#endif
bzero(&mtuctl, sizeof(mtuctl));
mtuctl.ip6m_mtu = *mtu;
mtuctl.ip6m_addr = *dst;
if (sa6_recoverscope(&mtuctl.ip6m_addr, TRUE))
return;
if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
return;
if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu, NULL)
== 0) {
m_freem(m_mtu);
} else
sorwakeup(so);
return;
}
#if PULLDOWN_TEST
static struct mbuf *
ip6_pullexthdr(m, off, nxt)
struct mbuf *m;
size_t off;
int nxt;
{
struct ip6_ext ip6e;
size_t elen;
struct mbuf *n;
#if DIAGNOSTIC
switch (nxt) {
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
case IPPROTO_HOPOPTS:
case IPPROTO_AH:
break;
default:
printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
}
#endif
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
if (nxt == IPPROTO_AH)
elen = (ip6e.ip6e_len + 2) << 2;
else
elen = (ip6e.ip6e_len + 1) << 3;
MGET(n, M_DONTWAIT, MT_DATA);
if (n && elen >= MLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (!n)
return NULL;
n->m_len = 0;
if (elen >= M_TRAILINGSPACE(n)) {
m_free(n);
return NULL;
}
m_copydata(m, off, elen, mtod(n, caddr_t));
n->m_len = elen;
return n;
}
#endif
char *
ip6_get_prevhdr(m, off)
struct mbuf *m;
int off;
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
if (off == sizeof(struct ip6_hdr))
return((char *) &ip6->ip6_nxt);
else {
int len, nxt;
struct ip6_ext *ip6e = NULL;
nxt = ip6->ip6_nxt;
len = sizeof(struct ip6_hdr);
while (len < off) {
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
switch (nxt) {
case IPPROTO_FRAGMENT:
len += sizeof(struct ip6_frag);
break;
case IPPROTO_AH:
len += (ip6e->ip6e_len + 2) << 2;
break;
default:
len += (ip6e->ip6e_len + 1) << 3;
break;
}
nxt = ip6e->ip6e_nxt;
}
if (ip6e)
return((char *) &ip6e->ip6e_nxt);
else
return NULL;
}
}
int
ip6_nexthdr(m, off, proto, nxtp)
struct mbuf *m;
int off;
int proto;
int *nxtp;
{
struct ip6_hdr ip6;
struct ip6_ext ip6e;
struct ip6_frag fh;
if (m == NULL)
panic("ip6_nexthdr: m == NULL");
if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
return -1;
switch (proto) {
case IPPROTO_IPV6:
if (m->m_pkthdr.len < off + sizeof(ip6))
return -1;
m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
if (nxtp)
*nxtp = ip6.ip6_nxt;
off += sizeof(ip6);
return off;
case IPPROTO_FRAGMENT:
if (m->m_pkthdr.len < off + sizeof(fh))
return -1;
m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
if (fh.ip6f_offlg & IP6F_OFF_MASK)
return -1;
if (nxtp)
*nxtp = fh.ip6f_nxt;
off += sizeof(struct ip6_frag);
return off;
case IPPROTO_AH:
if (m->m_pkthdr.len < off + sizeof(ip6e))
return -1;
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
if (nxtp)
*nxtp = ip6e.ip6e_nxt;
off += (ip6e.ip6e_len + 2) << 2;
return off;
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS:
if (m->m_pkthdr.len < off + sizeof(ip6e))
return -1;
m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
if (nxtp)
*nxtp = ip6e.ip6e_nxt;
off += (ip6e.ip6e_len + 1) << 3;
return off;
case IPPROTO_NONE:
case IPPROTO_ESP:
case IPPROTO_IPCOMP:
return -1;
default:
return -1;
}
return -1;
}
int
ip6_lasthdr(m, off, proto, nxtp)
struct mbuf *m;
int off;
int proto;
int *nxtp;
{
int newoff;
int nxt;
if (!nxtp) {
nxt = -1;
nxtp = &nxt;
}
while (1) {
newoff = ip6_nexthdr(m, off, proto, nxtp);
if (newoff < 0)
return off;
else if (newoff < off)
return -1;
else if (newoff == off)
return newoff;
off = newoff;
proto = *nxtp;
}
}
struct ip6aux *
ip6_addaux(struct mbuf *m)
{
struct m_tag *tag;
tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_INET6, NULL);
if (tag == NULL) {
tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6,
sizeof (struct ip6aux), M_DONTWAIT, m);
if (tag) {
m_tag_prepend(m, tag);
}
}
return (tag ? (struct ip6aux *)(tag + 1) : NULL);
}
struct ip6aux *
ip6_findaux(struct mbuf *m)
{
struct m_tag *tag;
tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_INET6, NULL);
return (tag ? (struct ip6aux *)(tag + 1) : NULL);
}
void
ip6_delaux(struct mbuf *m)
{
struct m_tag *tag;
tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
KERNEL_TAG_TYPE_INET6, NULL);
if (tag) {
m_tag_delete(m, tag);
}
}
void
ip6_destroyaux(struct ip6aux *n)
{
if (n->ip6a_dstia6 != NULL) {
IFA_REMREF(&n->ip6a_dstia6->ia_ifa);
n->ip6a_dstia6 = NULL;
}
}
void
ip6_copyaux(struct ip6aux *src, struct ip6aux *dst)
{
bcopy(src, dst, sizeof (*dst));
if (dst->ip6a_dstia6 != NULL)
IFA_ADDREF(&dst->ip6a_dstia6->ia_ifa);
}
u_char inet6ctlerrmap[PRC_NCMDS] = {
0, 0, 0, 0,
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
EMSGSIZE, EHOSTUNREACH, 0, 0,
0, 0, 0, 0,
ENOPROTOOPT
};