/*
- * Copyright (c) 2003-2008 Apple Inc. All rights reserved.
+ * Copyright (c) 2003-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#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_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>
#include <netinet/icmp6.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/nd6.h>
-#include <netinet6/in6_prefix.h>
+#include <netinet6/scope6_var.h>
+#include <mach/sdt.h>
#if IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ip6_fw.h>
+#if DUMMYNET
+#include <netinet/ip_fw.h>
+#include <netinet/ip_dummynet.h>
+#endif /* DUMMYNET */
+
#include <netinet/kpi_ipfilter_var.h>
#include <netinet6/ip6protosw.h>
/* we need it for NLOOP. */
#include "loop.h"
-#include "faith.h"
#include <net/net_osdep.h>
struct ip6protosw * ip6_protox[IPPROTO_MAX];
static int ip6qmaxlen = IFQ_MAXLEN;
-struct in6_ifaddr *in6_ifaddrs;
+
+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);
+
+/* Protected by in6_ifaddr_rwlock */
+struct in6_ifaddr *in6_ifaddrs = NULL;
int ip6_forward_srcrt; /* XXX */
int ip6_sourcecheck; /* XXX */
const int int6intrq_present = 1;
int ip6_ours_check_algorithm;
-int in6_init2done = 0;
+#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
/* firewall hooks */
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;
-lck_mtx_t *ip6_mutex;
-lck_mtx_t *dad6_mutex;
-lck_mtx_t *nd6_mutex;
-lck_mtx_t *prefix6_mutex;
-lck_mtx_t *scope6_mutex;
+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_init2(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 *);
#ifdef __APPLE__
void gifattach(void);
-void faithattach(void);
void stfattach(void);
#endif
-extern lck_mtx_t *domain_proto_mtx;
+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");
+
+/*
+ * On platforms which require strict alignment (currently for anything but
+ * i386 or x86_64), check if the IP header pointer is 32-bit aligned; if not,
+ * copy the contents of the mbuf chain into a new chain, and free the original
+ * one. Create some head room in the first mbuf of the new chain, in case
+ * it's needed later on.
+ *
+ * RFC 2460 says that IPv6 headers are 64-bit aligned, but network interfaces
+ * mostly align to 32-bit boundaries. Care should be taken never to use 64-bit
+ * load/store operations on the fields in IPv6 headers.
+ */
+#if defined(__i386__) || defined(__x86_64__)
+#define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { } while (0)
+#else /* !__i386__ && !__x86_64__ */
+#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 /* !__i386__ && !__x86_64__ */
static void
ip6_proto_input(
int i;
struct timeval tv;
+ _CASSERT((sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) <=
+ _MHLEN);
+
+ 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)");
ip6_mutex_grp = lck_grp_alloc_init("ip6", ip6_mutex_grp_attr);
ip6_mutex_attr = lck_attr_alloc_init();
- if ((ip6_mutex = lck_mtx_alloc_init(ip6_mutex_grp, ip6_mutex_attr)) == NULL) {
- panic("ip6_init: can't alloc ip6_mutex\n");
- }
- if ((dad6_mutex = lck_mtx_alloc_init(ip6_mutex_grp, ip6_mutex_attr)) == NULL) {
- panic("ip6_init: can't alloc dad6_mutex\n");
- }
- if ((nd6_mutex = lck_mtx_alloc_init(ip6_mutex_grp, ip6_mutex_attr)) == NULL) {
- panic("ip6_init: can't alloc nd6_mutex\n");
- }
+ 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);
- if ((prefix6_mutex = lck_mtx_alloc_init(ip6_mutex_grp, ip6_mutex_attr)) == NULL) {
- panic("ip6_init: can't alloc prefix6_mutex\n");
- }
+#ifdef ENABLE_ADDRSEL
+ lck_mtx_init(addrsel_mutex, ip6_mutex_grp, ip6_mutex_attr);
+#endif
- if ((scope6_mutex = lck_mtx_alloc_init(ip6_mutex_grp, ip6_mutex_attr)) == NULL) {
- panic("ip6_init: can't alloc scope6_mutex\n");
- }
+ 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();
/*
* in many cases, random() here does NOT return random number
* as initialization during bootstrap time occur in fixed order.
ip6_flow_seq = random() ^ tv.tv_usec;
microtime(&tv);
ip6_desync_factor = (random() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
- timeout(ip6_init2, (caddr_t)0, 1 * hz);
- lck_mtx_unlock(domain_proto_mtx);
+ /*
+ * P2P interfaces often route the local address to the loopback
+ * interface. At this point, lo0 hasn't been initialized yet, which
+ * means that we need to delay the IPv6 configuration of lo0.
+ */
+ net_init_add(ip6_init_delayed);
+
+ domain_proto_mtx_unlock(TRUE);
proto_register_input(PF_INET6, ip6_proto_input, NULL, 0);
- lck_mtx_lock(domain_proto_mtx);
+ domain_proto_mtx_lock();
}
static void
-ip6_init2(
- __unused void *dummy)
+ip6_init_delayed(void)
{
- /*
- * to route local address of p2p link to loopback,
- * assign loopback address first.
- */
- if (loopattach_done == 0) {
- timeout(ip6_init2, (caddr_t)0, 1 * hz);
- return;
- }
(void) in6_ifattach(lo_ifp, NULL, NULL);
#ifdef __APPLE__
/* nd6_timer_init */
timeout(nd6_timer, (caddr_t)0, hz);
- /* router renumbering prefix list maintenance */
- timeout(in6_rr_timer, (caddr_t)0, hz);
-
/* timer for regeneranation of temporary addresses randomize ID */
timeout(in6_tmpaddrtimer, (caddr_t)0,
(ip6_temp_preferred_lifetime - ip6_desync_factor -
#if NGIF
gifattach();
#endif
-#if NFAITH
- faithattach();
-#endif
#if NSTF
stfattach();
#endif
-#else
- /* nd6_timer_init */
-
- callout_init(&nd6_timer_ch);
- callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
-
- /* router renumbering prefix list maintenance */
- callout_init(&in6_rr_timer_ch);
- callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
-
- /* timer for regeneranation of temporary addresses randomize ID */
- callout_reset(&in6_tmpaddrtimer_ch,
- (ip6_temp_preferred_lifetime - ip6_desync_factor -
- ip6_temp_regen_advance) * hz,
- in6_tmpaddrtimer, NULL);
-#endif
-
- in6_init2done = 1;
+#endif /* __APPLE__ */
}
-#if __FreeBSD__
-/* cheat */
-/* This must be after route_init(), which is now SI_ORDER_THIRD */
-SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
-#endif
-
-/*
- * ip6_forward_rt contains the route entry that was recently used during
- * the forwarding of an IPv6 packet and thus acts as a route cache. Access
- * to this variable is protected by the global lock ip6_mutex.
- */
-static struct route_in6 ip6_forward_rt;
-
void
-ip6_input(m)
- struct mbuf *m;
+ip6_input(struct mbuf *m)
{
struct ip6_hdr *ip6;
int off = sizeof(struct ip6_hdr), nest;
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 /* DUMMYNET */
+
+ bzero(&ip6_forward_rt, sizeof(ip6_forward_rt));
+
+ /* Check if the packet we received is valid after interface filter
+ * processing
+ */
+ MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif);
+
+ /* Perform IP header alignment fixup, if needed */
+ 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 *); /* In case PF got disabled */
+
+ goto check_with_pf;
+ }
+#endif /* DUMMYNET */
/*
* No need to proccess packet twice if we've
goto injectit;
} else
seen = 1;
-
+
#if IPSEC
/*
* should the inner packet be considered authentic?
*/
ip6_delaux(m);
- lck_mtx_lock(ip6_mutex);
/*
* mbuf statistics
*/
#undef M2MMAX
}
+ /*
+ * Drop the packet if IPv6 operation is disabled on the IF;
+ * accessing the flag is done without acquiring nd_ifinfo lock
+ * for performance reasons.
+ */
+ 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++;
n = NULL;
}
}
- if (n == NULL) {
- m_freem(m);
- lck_mtx_unlock(ip6_mutex);
- return; /*ENOBUFS*/
- }
+ 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 = n;
}
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),
- {lck_mtx_unlock(ip6_mutex); return;});
+ {goto done;});
#endif
if (m->m_len < sizeof(struct ip6_hdr)) {
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
ip6stat.ip6s_toosmall++;
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
- lck_mtx_unlock(ip6_mutex);
- return;
+ goto done;
}
}
ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
+#if IPFW2
/*
* Check with the firewall...
*/
m_freem(m);
m = NULL;
}
- if (!m) {
- lck_mtx_unlock(ip6_mutex);
- return;
- }
+ if (!m)
+ goto done;
}
+#endif
/*
* Check against address spoofing/corruption.
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
- if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
- IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
- (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
+ if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
+ !(m->m_flags & M_LOOP)) {
+ /*
+ * In this case, the packet should come from the loopback
+ * interface. However, we cannot just check the if_flags,
+ * because ip6_mloopback() passes the "actual" interface
+ * as the outgoing/incoming interface.
+ */
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
* The following check is not documented in specs. A malicious
* party may be able to use IPv4 mapped addr to confuse tcp/udp stack
* and bypass security checks (act as if it was from 127.0.0.1 by using
- * IPv6 src ::ffff:127.0.0.1). Be cautious.
+ * IPv6 src ::ffff:127.0.0.1). Be cautious.
*
* This check chokes if we are in an SIIT cloud. As none of BSDs
* support IPv4-less kernel compilation, we cannot support SIIT
* environment at all. So, it makes more sense for us to reject any
* malicious packets for non-SIIT environment, than try to do a
- * partical support for SIIT environment.
+ * partial support for SIIT environment.
*/
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
}
#endif
+ /*
+ * Naively assume we can attribute inbound data to the route we would
+ * use to send to this destination. Asymetric routing breaks this
+ * assumption, but it still allows us to account for traffic from
+ * a remote node in the routing table.
+ * this has a very significant performance impact so we bypass
+ * if nstat_collect is disabled. We may also bypass if the
+ * protocol is tcp in the future because tcp will have a route that
+ * we can use to attribute the data to. That does mean we would not
+ * account for forwarded tcp traffic.
+ */
+ 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
/* Invoke inbound packet filter */
- lck_mtx_unlock(ip6_mutex);
- if (pf_af_hook(m->m_pkthdr.rcvif, NULL, &m, AF_INET6, TRUE) != 0) {
- if (m != NULL) {
- panic("%s: unexpected packet %p\n", __func__, m);
- /* NOTREACHED */
+ 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);
+ /* NOTREACHED */
+ }
+ /* Already freed by callee */
+ goto done;
}
- /* Already freed by callee */
- return;
+ ip6 = mtod(m, struct ip6_hdr *);
}
- ip6 = mtod(m, struct ip6_hdr *);
- lck_mtx_lock(ip6_mutex);
#endif /* PF */
/* drop packets if interface ID portion is already filled */
ip6->ip6_dst.s6_addr16[1]
= htons(m->m_pkthdr.rcvif->if_index);
-#if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
- /*
- * We use rt->rt_ifp to determine if the address is ours or not.
- * If rt_ifp is lo0, the address is ours.
- * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
- * so any address under fe80::%lo0/64 will be mistakenly considered
- * local. The special case is supplied to handle the case properly
- * by actually looking at interface addresses
- * (using in6ifa_ifpwithaddr).
- */
- if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
- IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
- struct in6_ifaddr *ia6;
- if (!(ia6 = in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst))) {
- lck_mtx_unlock(ip6_mutex);
- icmp6_error(m, ICMP6_DST_UNREACH,
- ICMP6_DST_UNREACH_ADDR, 0);
- /* m is already freed */
- return;
- }
- ifafree(&ia6->ia_ifa);
-
- ours = 1;
- deliverifp = m->m_pkthdr.rcvif;
- goto hbhcheck;
- }
-#endif
-
/*
* Multicast check
*/
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
- struct in6_multi *in6m = 0;
+ struct in6_multi *in6m = NULL;
struct ifnet *ifp = m->m_pkthdr.rcvif;
in6_ifstat_inc(ifp, ifs6_in_mcast);
* See if we belong to the destination multicast group on the
* arrival interface.
*/
- ifnet_lock_shared(ifp);
- IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
- ifnet_lock_done(ifp);
- if (in6m)
+ 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 (!ip6_mrouter) {
+ } else if (!nd6_prproxy
+#if MROUTING
+ && !ip6_mrouter
+#endif
+ ) {
ip6stat.ip6s_notmember++;
ip6stat.ip6s_cantforward++;
in6_ifstat_inc(ifp, ifs6_in_discard);
goto hbhcheck;
}
- if (ip6_forward_rt.ro_rt != NULL)
- RT_LOCK(ip6_forward_rt.ro_rt);
/*
* Unicast check
*/
- if (ip6_forward_rt.ro_rt != NULL &&
- (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
- IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
- &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr) &&
- ip6_forward_rt.ro_rt->generation_id == route_generation) {
- ip6stat.ip6s_forward_cachehit++;
- } else {
- struct sockaddr_in6 *dst6;
+ 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;
- if (ip6_forward_rt.ro_rt != NULL) {
- /* route is down/stale or destination is different */
- ip6stat.ip6s_forward_cachemiss++;
- RT_UNLOCK(ip6_forward_rt.ro_rt);
- rtfree(ip6_forward_rt.ro_rt);
- ip6_forward_rt.ro_rt = NULL;
- }
-
- bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
- 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;
-#if SCOPEDROUTING
- ip6_forward_rt.ro_dst.sin6_scope_id =
- in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst);
-#endif
-
- rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
- if (ip6_forward_rt.ro_rt != NULL)
- RT_LOCK(ip6_forward_rt.ro_rt);
- }
+ 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))
&rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
#endif
ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
- struct in6_ifaddr *ia6 =
- (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
+ ia6 = (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
/*
* record address information into m_aux.
* packets to a tentative, duplicated, or somehow invalid
* address must not be accepted.
*/
+ RT_CONVERT_LOCK(ip6_forward_rt.ro_rt); /* just in case */
+ IFA_LOCK_SPIN(&ia6->ia_ifa);
if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
+ IFA_UNLOCK(&ia6->ia_ifa);
/* this address is ready */
ours = 1;
deliverifp = ia6->ia_ifp; /* correct? */
/* Count the packet in the ip address stats */
-#ifndef __APPLE__
- ia6->ia_ifa.if_ipackets++;
- ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
-#endif
RT_UNLOCK(ip6_forward_rt.ro_rt);
+ ia6 = NULL;
goto hbhcheck;
- } else {
- RT_UNLOCK(ip6_forward_rt.ro_rt);
- /* address is not ready, so discard the packet. */
- nd6log((LOG_INFO,
- "ip6_input: packet to an unready address %s->%s\n",
- ip6_sprintf(&ip6->ip6_src),
- ip6_sprintf(&ip6->ip6_dst)));
- goto bad;
}
+ IFA_UNLOCK(&ia6->ia_ifa);
+ RT_UNLOCK(ip6_forward_rt.ro_rt);
+ /* address is not ready, so discard the packet. */
+ 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;
}
- /*
- * FAITH(Firewall Aided Internet Translator)
- */
-#if defined(NFAITH) && 0 < NFAITH
- if (ip6_keepfaith) {
- if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
- && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
- /* XXX do we need more sanity checks? */
- ours = 1;
- deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
- RT_UNLOCK(ip6_forward_rt.ro_rt);
- goto hbhcheck;
- }
- }
-#endif
if (ip6_forward_rt.ro_rt != NULL)
RT_UNLOCK(ip6_forward_rt.ro_rt);
/*
* record address information into m_aux, if we don't have one yet.
* note that we are unable to record it, if the address is not listed
- * as our interface address (e.g. multicast addresses, addresses
- * within FAITH prefixes and such).
+ * as our interface address (e.g. multicast addresses, etc.)
*/
- if (deliverifp && !ip6_getdstifaddr(m)) {
- struct in6_ifaddr *ia6;
-
+ if (deliverifp && (ia6 = ip6_getdstifaddr(m)) == NULL) {
ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
if (ia6) {
if (!ip6_setdstifaddr(m, ia6)) {
* to the upper layers.
*/
}
- ifafree(&ia6->ia_ifa);
+ IFA_REMREF(&ia6->ia_ifa);
+ ia6 = NULL;
}
}
+ if (ia6 != NULL) {
+ IFA_REMREF(&ia6->ia_ifa);
+ ia6 = NULL;
+ }
+
/*
* Process Hop-by-Hop options header if it's contained.
* m may be modified in ip6_hopopts_input().
#if 0 /*touches NULL pointer*/
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
#endif
- lck_mtx_unlock(ip6_mutex);
- return; /* m have already been freed */
+ goto done; /* m have already been freed */
}
/* adjust pointer */
if (ip6->ip6_plen == 0 && plen == 0) {
/*
* Note that if a valid jumbo payload option is
- * contained, ip6_hoptops_input() must set a valid
- * (non-zero) payload length to the variable plen.
+ * contained, ip6_hopopts_input() must set a valid
+ * (non-zero) payload length to the variable plen.
*/
ip6stat.ip6s_badoptions++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
(caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
- return;
+ goto done;
}
#ifndef PULLDOWN_TEST
/* ip6_hopopts_input() ensures that mbuf is contiguous */
sizeof(struct ip6_hbh));
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
- lck_mtx_unlock(ip6_mutex);
- return;
+ goto done;
}
#endif
nxt = hbh->ip6h_nxt;
/*
- * accept the packet if a router alert option is included
- * and we act as an IPv6 router.
+ * If we are acting as a router and the packet contains a
+ * router alert option, see if we know the option value.
+ * Currently, we only support the option value for MLD, in which
+ * case we should pass the packet to the multicast routing
+ * daemon.
*/
- if (rtalert != ~0 && ip6_forwarding)
- ours = 1;
+ if (rtalert != ~0 && ip6_forwarding) {
+ switch (rtalert) {
+ case IP6OPT_RTALERT_MLD:
+ ours = 1;
+ break;
+ default:
+ /*
+ * RFC2711 requires unrecognized values must be
+ * silently ignored.
+ */
+ break;
+ }
+ }
} else
nxt = ip6->ip6_nxt;
* ip6_mforward() returns a non-zero value, the packet
* must be discarded, else it may be accepted below.
*/
+#if MROUTING
if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
ip6stat.ip6s_cantforward++;
- m_freem(m);
- lck_mtx_unlock(ip6_mutex);
- return;
+ goto bad;
}
- if (!ours) {
- m_freem(m);
- lck_mtx_unlock(ip6_mutex);
- return;
+#endif
+ if (!ours && nd6_prproxy) {
+ /*
+ * If this isn't for us, this might be a Neighbor
+ * Solicitation (dst is solicited-node multicast)
+ * against an address in one of the proxied prefixes;
+ * if so, claim the packet and let icmp6_input()
+ * handle the rest.
+ */
+ 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) {
- ip6_forward(m, &ip6_forward_rt, 0, 1);
- lck_mtx_unlock(ip6_mutex);
- return;
- }
+ /*
+ * The unicast forwarding function might return the packet
+ * if we are proxying prefix(es), and if the packet is an
+ * ICMPv6 packet that has failed the zone checks, but is
+ * targetted towards a proxied address (this is optimized by
+ * way of RTF_PROXY test.) If so, claim the packet as ours
+ * and let icmp6_input() handle the rest. The packet's hop
+ * limit value is kept intact (it's not decremented). This
+ * is for supporting Neighbor Unreachability Detection between
+ * proxied nodes on different links (src is link-local, dst
+ * is target address.)
+ */
+ 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 *);
ip6stat.ip6s_delivered++;
in6_ifstat_inc(deliverifp, ifs6_in_deliver);
- lck_mtx_unlock(ip6_mutex);
injectit:
nest = 0;
+ /*
+ * Perform IP header alignment fixup again, if needed. Note that
+ * we do it once for the outermost protocol, and we assume each
+ * protocol handler wouldn't mess with the alignment afterwards.
+ */
+ 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 badunlocked;
+ goto bad;
}
/*
if (m->m_pkthdr.len < off) {
ip6stat.ip6s_tooshort++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
- goto badunlocked;
- }
-
-#if 0
- /*
- * do we need to do it for every header? yeah, other
- * functions can play with it (like re-allocate and copy).
- */
- mhist = ip6_addaux(m);
- if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
- hist = mtod(mhist, caddr_t) + mhist->m_len;
- bcopy(&nxt, hist, sizeof(nxt));
- mhist->m_len += sizeof(nxt);
- } else {
- ip6stat.ip6s_toomanyhdr++;
goto bad;
}
-#endif
+
#if IPSEC
/*
* note that we do not visit this with protocols with pcb layer
* code - like udp/tcp/raw ip.
*/
- if ((ipsec_bypass == 0) && (ip6_protox[nxt]->pr_flags & PR_LASTHDR) != 0) {
+ 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 badunlocked;
+ goto bad;
}
}
#endif
ipf_ref();
TAILQ_FOREACH(filter, &ipv6_filters, ipf_link) {
if (seen == 0) {
- if ((struct ipfilter *)inject_ipfref == filter)
+ 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);
+ filter->ipf_filter.cookie,
+ (mbuf_t *)&m, off, nxt);
if (result == EJUSTRETURN) {
ipf_unref();
- return;
+ goto done;
}
if (result != 0) {
ipf_unref();
- m_freem(m);
- return;
+ goto bad;
}
}
}
ipf_unref();
}
- if (!(ip6_protox[nxt]->pr_flags & PR_PROTOLOCK)) {
+
+ 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 = (*ip6_protox[nxt]->pr_input)(&m, &off);
+ nxt = pr_input(&m, &off, nxt);
lck_mtx_unlock(inet6_domain_mutex);
+ } else {
+ nxt = pr_input(&m, &off, nxt);
}
- else
- nxt = (*ip6_protox[nxt]->pr_input)(&m, &off);
}
+done:
+ if (ip6_forward_rt.ro_rt != NULL)
+ rtfree(ip6_forward_rt.ro_rt);
return;
bad:
- lck_mtx_unlock(ip6_mutex);
- badunlocked:
m_freem(m);
- return;
+ goto done;
}
/*
struct ip6aux *n;
n = ip6_addaux(m);
- if (n)
+ 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; /* NULL if failed to set */
}
struct ip6aux *n;
n = ip6_findaux(m);
- if (n)
- return n->ip6a_dstia6;
- else
- return NULL;
+ if (n != NULL) {
+ if (n->ip6a_dstia6 != NULL)
+ IFA_ADDREF(&n->ip6a_dstia6->ia_ifa);
+ return (n->ip6a_dstia6);
+ }
+ return (NULL);
}
/*
* included, the real payload length will be stored in plenp.
*/
static int
-ip6_hopopts_input(plenp, rtalertp, mp, offp)
- u_int32_t *plenp;
- u_int32_t *rtalertp; /* XXX: should be stored more smart way */
- struct mbuf **mp;
- int *offp;
+ip6_hopopts_input(uint32_t *plenp, uint32_t *rtalertp, struct mbuf **mp,
+ int *offp)
{
struct mbuf *m = *mp;
int off = *offp, hbhlen;
if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
hbhlen, rtalertp, plenp) < 0)
- return(-1);
+ return (-1);
*offp = off;
*mp = m;
- return(0);
+ return (0);
}
/*
}
optlen = *(opt + 1) + 2;
break;
- case IP6OPT_RTALERT:
+ case IP6OPT_ROUTER_ALERT:
/* XXX may need check for alignment */
if (hbhlen < IP6OPT_RTALERT_LEN) {
ip6stat.ip6s_toosmall++;
}
if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
/* XXX stat */
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 1 - opthead);
- lck_mtx_lock(ip6_mutex);
return(-1);
}
optlen = IP6OPT_RTALERT_LEN;
}
if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
/* XXX stat */
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 1 - opthead);
- lck_mtx_lock(ip6_mutex);
return(-1);
}
optlen = IP6OPT_JUMBO_LEN;
ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_plen) {
ip6stat.ip6s_badoptions++;
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt - opthead);
- lck_mtx_lock(ip6_mutex);
return(-1);
}
*/
if (*plenp != 0) {
ip6stat.ip6s_badoptions++;
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 2 - opthead);
- lck_mtx_lock(ip6_mutex);
return(-1);
}
#endif
*/
if (jumboplen <= IPV6_MAXPACKET) {
ip6stat.ip6s_badoptions++;
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 2 - opthead);
- lck_mtx_lock(ip6_mutex);
return(-1);
}
*plenp = jumboplen;
goto bad;
}
optlen = ip6_unknown_opt(opt, m,
- erroff + opt - opthead, 1);
+ erroff + opt - opthead);
if (optlen == -1) {
- /* ip6_unknown opt unlocked ip6_mutex */
return(-1);
}
optlen += 2;
* is not continuous in order to return an ICMPv6 error.
*/
int
-ip6_unknown_opt(optp, m, off, locked)
- u_int8_t *optp;
- struct mbuf *m;
- int off;
- int locked;
+ip6_unknown_opt(uint8_t *optp, struct mbuf *m, int off)
{
struct ip6_hdr *ip6;
return(-1);
case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
ip6stat.ip6s_badoptions++;
- if (locked)
- lck_mtx_unlock(ip6_mutex);
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
- if (locked)
- lck_mtx_lock(ip6_mutex);
return(-1);
case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
ip6stat.ip6s_badoptions++;
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
(m->m_flags & (M_BCAST|M_MCAST)))
m_freem(m);
- else {
- if (locked)
- lck_mtx_unlock(ip6_mutex);
+ else
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_OPTION, off);
- if (locked)
- lck_mtx_lock(ip6_mutex);
- }
return(-1);
}
m_freem(m); /* XXX: NOTREACHED */
- return(-1);
+ return (-1);
}
/*
* Create the "control" list for this pcb.
- * The function will not modify mbuf chain at all.
+ * These functions will not modify mbuf chain at all.
*
- * with KAME mbuf chain restriction:
+ * With KAME mbuf chain restriction:
* The routine will be called from upper layer handlers like tcp6_input().
* Thus the routine assumes that the caller (tcp6_input) have already
* called IP6_EXTHDR_CHECK() and all the extension headers are located in the
* very first mbuf on the mbuf chain.
+ *
+ * ip6_savecontrol_v4 will handle those options that are possible to be
+ * set on a v4-mapped socket.
+ * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
+ * options and handle the v6-only ones itself.
*/
-void
-ip6_savecontrol(in6p, mp, ip6, m)
- struct inpcb *in6p;
- struct mbuf **mp;
- struct ip6_hdr *ip6;
- struct mbuf *m;
+struct mbuf **
+ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
+ int *v4only)
{
- int rthdr_exist = 0;
+ struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
-#if SO_TIMESTAMP
- if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
+ if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
struct timeval tv;
microtime(&tv);
- *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
- SCM_TIMESTAMP, SOL_SOCKET);
- if (*mp) {
- mp = &(*mp)->m_next;
- }
+ mp = sbcreatecontrol_mbuf((caddr_t) &tv, sizeof(tv),
+ SCM_TIMESTAMP, SOL_SOCKET, mp);
+ if (*mp == NULL)
+ return NULL;
}
-#endif
+ if ((inp->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) {
+ uint64_t time;
- /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
- if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
- return;
+ 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))
/* RFC 2292 sec. 5 */
- if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
+ if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
struct in6_pktinfo pi6;
+
bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
- if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
- pi6.ipi6_addr.s6_addr16[1] = 0;
- pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
- ? m->m_pkthdr.rcvif->if_index
- : 0;
- *mp = sbcreatecontrol((caddr_t) &pi6,
- sizeof(struct in6_pktinfo), IPV6_PKTINFO,
- IPPROTO_IPV6);
- if (*mp)
- mp = &(*mp)->m_next;
+ in6_clearscope(&pi6.ipi6_addr); /* XXX */
+ 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 ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
+ if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
int hlim = ip6->ip6_hlim & 0xff;
- *mp = sbcreatecontrol((caddr_t) &hlim,
- sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
- if (*mp)
- mp = &(*mp)->m_next;
+
+ mp = sbcreatecontrol_mbuf((caddr_t) &hlim, sizeof(int),
+ IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
+ IPPROTO_IPV6, mp);
+ if (*mp == NULL)
+ return NULL;
}
- if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
- u_int32_t flowinfo;
- int tclass;
+ if (v4only != NULL)
+ *v4only = 0;
+ return (mp);
+}
- flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
- flowinfo >>= 20;
+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;
- tclass = flowinfo & 0xff;
- *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
- IPV6_TCLASS, IPPROTO_IPV6);
- if (*mp)
- mp = &(*mp)->m_next;
- }
+ *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;
+ }
/*
* IPV6_HOPOPTS socket option. Recall that we required super-user
* privilege for the option (see ip6_ctloutput), but it might be too
* strict, since there might be some hop-by-hop options which can be
* returned to normal user.
- * See RFC 2292 section 6.
+ * See also RFC 2292 section 6 (or RFC 3542 section 8).
*/
- if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
+ if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
/*
* Check if a hop-by-hop options header is contatined in the
* received packet, and if so, store the options as ancillary
* data. Note that a hop-by-hop options header must be
- * just after the IPv6 header, which fact is assured through
- * the IPv6 input processing.
+ * just after the IPv6 header, which is assured through the
+ * IPv6 input processing.
*/
ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
ip6->ip6_nxt);
if (ext == NULL) {
ip6stat.ip6s_tooshort++;
- return;
+ 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;
+ return(0);
}
#endif
/*
- * XXX: We copy whole the header even if a jumbo
- * payload option is included, which option is to
- * be removed before returning in the RFC 2292.
- * Note: this constraint is removed in 2292bis.
+ * XXX: We copy the whole header even if a
+ * jumbo payload option is included, the option which
+ * is to be removed before returning according to
+ * RFC2292.
+ * Note: this constraint is removed in RFC3542
*/
- *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
- IPV6_HOPOPTS, IPPROTO_IPV6);
- if (*mp)
- mp = &(*mp)->m_next;
+ mp = sbcreatecontrol_mbuf((caddr_t)hbh, hbhlen,
+ IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
+ IPPROTO_IPV6, mp);
+
#if PULLDOWN_TEST
m_freem(ext);
#endif
- }
- }
-
- /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
- if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
- int proto, off, nxt;
-
- /*
- * go through the header chain to see if a routing header is
- * contained in the packet. We need this information to store
- * destination options headers (if any) properly.
- * XXX: performance issue. We should record this info when
- * processing extension headers in incoming routine.
- * (todo) use m_aux?
- */
- proto = IPPROTO_IPV6;
- off = 0;
- nxt = -1;
- while (1) {
- int newoff;
-
- newoff = ip6_nexthdr(m, off, proto, &nxt);
- if (newoff < 0)
- break;
- if (newoff < off) /* invalid, check for safety */
- break;
- if ((proto = nxt) == IPPROTO_ROUTING) {
- rthdr_exist = 1;
- break;
+ if (*mp == NULL) {
+ goto no_mbufs;
}
- off = newoff;
}
}
- if ((in6p->in6p_flags &
- (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
- ip6 = mtod(m, struct ip6_hdr *);
+ if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
/*
ext = ip6_pullexthdr(m, off, nxt);
if (ext == NULL) {
ip6stat.ip6s_tooshort++;
- return;
+ return(0);
}
ip6e = mtod(ext, struct ip6_ext *);
if (nxt == IPPROTO_AH)
if (elen != ext->m_len) {
m_freem(ext);
ip6stat.ip6s_tooshort++;
- return;
+ return(0);
}
#endif
switch (nxt) {
case IPPROTO_DSTOPTS:
- if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
+ if (!(in6p->inp_flags & IN6P_DSTOPTS))
break;
- *mp = sbcreatecontrol((caddr_t)ip6e, elen,
- IPV6_DSTOPTS,
- IPPROTO_IPV6);
- if (*mp)
- mp = &(*mp)->m_next;
+ 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->in6p_flags & IN6P_RTHDR)
+ if (!in6p->inp_flags & IN6P_RTHDR)
break;
- *mp = sbcreatecontrol((caddr_t)ip6e, elen,
- IPV6_RTHDR,
- IPPROTO_IPV6);
- if (*mp)
- mp = &(*mp)->m_next;
+ 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: /* is it possible? */
default:
/*
- * other cases have been filtered in the above.
+ * other cases have been filtered in the above.
* none will visit this case. here we supply
* the code just in case (nxt overwritten or
* other cases).
loopend:
;
}
+ return(0);
+no_mbufs:
+ ip6stat.ip6s_pktdropcntrl++;
+ /* XXX increment a stat to show the failure */
+ 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) /* I believe this is impossible */
+ panic("ip6_notify_pmtu: socket is NULL");
+#endif
+
+ bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
+ 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);
+ /* XXX: should count statistics */
+ } else
+ sorwakeup(so);
+
+ return;
}
#if PULLDOWN_TEST
}
struct ip6aux *
-ip6_addaux(
- struct mbuf *m)
+ip6_addaux(struct mbuf *m)
{
struct m_tag *tag;
-
+
/* Check if one is already allocated */
- tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6, NULL);
+ tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_INET6, NULL);
if (tag == NULL) {
/* Allocate a tag */
- tag = m_tag_alloc(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6,
- sizeof (struct ip6aux), M_DONTWAIT);
+ tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6,
+ sizeof (struct ip6aux), M_DONTWAIT, m);
/* Attach it to the mbuf */
if (tag) {
m_tag_prepend(m, tag);
}
}
-
- return tag ? (struct ip6aux*)(tag + 1) : NULL;
+
+ return (tag ? (struct ip6aux *)(tag + 1) : NULL);
}
struct ip6aux *
-ip6_findaux(
- struct mbuf *m)
+ip6_findaux(struct mbuf *m)
{
struct m_tag *tag;
-
- tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_ENCAP, NULL);
-
- return tag ? (struct ip6aux*)(tag + 1) : NULL;
+
+ 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)
+ip6_delaux(struct mbuf *m)
{
struct m_tag *tag;
- tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_ENCAP, NULL);
+ tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_INET6, NULL);
if (tag) {
m_tag_delete(m, tag);
}
}
+/*
+ * Called by m_tag_free().
+ */
+void
+ip6_destroyaux(struct ip6aux *n)
+{
+ if (n->ip6a_dstia6 != NULL) {
+ IFA_REMREF(&n->ip6a_dstia6->ia_ifa);
+ n->ip6a_dstia6 = NULL;
+ }
+}
+
+/*
+ * Called by m_tag_copy()
+ */
+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);
+}
+
/*
* System control for IP6
*/
projects / apple / xnu.git / blobdiff