/*
- * Copyright (c) 2008 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
+#include <sys/mcache.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/domain.h>
+#include <sys/kauth.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet6/mld6_var.h>
#include <netinet/in_pcb.h>
#include <netinet6/in6_pcb.h>
+#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6protosw.h>
+#include <netinet6/scope6_var.h>
#if IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
-
-extern int ipsec_bypass;
#endif
#include <net/net_osdep.h>
-extern struct domain inet6domain;
-extern struct ip6protosw inet6sw[];
+#if NECP
+#include <net/necp.h>
+#endif
+
extern struct ip6protosw *ip6_protox[];
extern uint32_t rip_sendspace;
extern struct inpcbhead ripcb;
extern int icmp6errppslim;
+extern int icmp6errppslim_random_incr;
+extern int icmp6rappslim;
static int icmp6errpps_count = 0;
+static int icmp6rapps_count = 0;
static struct timeval icmp6errppslim_last;
+static struct timeval icmp6rappslim_last;
extern int icmp6_nodeinfo;
extern struct inpcbinfo ripcbinfo;
-extern lck_mtx_t *ip6_mutex;
-extern lck_mtx_t *nd6_mutex;
-extern lck_mtx_t *inet6_domain_mutex;
static void icmp6_errcount(struct icmp6errstat *, int, int);
static int icmp6_rip6_input(struct mbuf **, int);
static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
static const char *icmp6_redirect_diag(struct in6_addr *,
- struct in6_addr *, struct in6_addr *);
-#ifndef HAVE_PPSRATECHECK
-static int ppsratecheck(struct timeval *, int *, int);
-#endif
+ struct in6_addr *, struct in6_addr *);
static struct mbuf *ni6_input(struct mbuf *, int);
-static struct mbuf *ni6_nametodns(const char *, int, int);
+static struct mbuf *ni6_nametodns(const char *, uint32_t, int);
static int ni6_dnsmatch(const char *, int, const char *, int);
-static int ni6_addrs(struct icmp6_nodeinfo *,
- struct ifnet **, char *);
+static int ni6_addrs(struct icmp6_nodeinfo *,
+ struct ifnet **, char *);
static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
- struct ifnet *, int);
+ struct ifnet *, int);
static int icmp6_notify_error(struct mbuf *, int, int, int);
-#ifdef COMPAT_RFC1885
-/*
- * XXX: Compiled out for now, but if enabled we must use a lock for accesses,
- * or easier, define it locally inside icmp6_reflect() and don't cache.
- */
-static struct route_in6 icmp6_reflect_rt;
-#endif
void
-icmp6_init()
+icmp6_init(struct ip6protosw *pp, struct domain *dp)
{
- mld6_init();
+#pragma unused(dp)
+ static int icmp6_initialized = 0;
+
+ /* Also called from ip6_init() without pp */
+ VERIFY(pp == NULL ||
+ (pp->pr_flags & (PR_INITIALIZED | PR_ATTACHED)) == PR_ATTACHED);
+
+ /* This gets called by more than one protocols, so initialize once */
+ if (!icmp6_initialized) {
+ icmp6_initialized = 1;
+ mld_init();
+ if (icmp6errppslim >= 0 &&
+ icmp6errppslim_random_incr > 0 &&
+ icmp6errppslim <= INT32_MAX - (icmp6errppslim_random_incr + 1)) {
+ icmp6errppslim += (random() % icmp6errppslim_random_incr) + 1;
+ }
+ }
}
static void
-icmp6_errcount(stat, type, code)
- struct icmp6errstat *stat;
- int type, code;
+icmp6_errcount(struct icmp6errstat *stat, int type, int code)
{
switch (type) {
case ICMP6_DST_UNREACH:
stat->icp6errs_unknown++;
}
+/*
+ * A wrapper function for icmp6_error() necessary when the erroneous packet
+ * may not contain enough scope zone information.
+ */
+void
+icmp6_error2(struct mbuf *m, int type, int code, int param,
+ struct ifnet *ifp)
+{
+ struct ip6_hdr *ip6;
+
+ if (ifp == NULL) {
+ return;
+ }
+
+#ifndef PULLDOWN_TEST
+ IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return );
+#else
+ if (m->m_len < sizeof(struct ip6_hdr)) {
+ m = m_pullup(m, sizeof(struct ip6_hdr));
+ if (m == NULL) {
+ return;
+ }
+ }
+#endif
+
+ ip6 = mtod(m, struct ip6_hdr *);
+
+ if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) {
+ return;
+ }
+ if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) {
+ return;
+ }
+
+ icmp6_error(m, type, code, param);
+}
+
/*
* Generate an error packet of type error in response to bad IP6 packet.
*/
void
-icmp6_error(m, type, code, param)
- struct mbuf *m;
- int type, code, param;
+icmp6_error(struct mbuf *m, int type, int code, int param)
+{
+ icmp6_error_flag(m, type, code, param, ICMP6_ERROR_RST_MRCVIF);
+}
+
+void
+icmp6_error_flag(struct mbuf *m, int type, int code, int param, int flags)
{
struct ip6_hdr *oip6, *nip6;
struct icmp6_hdr *icmp6;
u_int preplen;
int off;
- int nxt;
icmp6stat.icp6s_error++;
- lck_mtx_assert(ip6_mutex, LCK_MTX_ASSERT_NOTOWNED);
/* count per-type-code statistics */
icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
-#ifdef M_DECRYPTED /*not openbsd*/
+#ifdef M_DECRYPTED /*not openbsd*/
if (m->m_flags & M_DECRYPTED) {
icmp6stat.icp6s_canterror++;
goto freeit;
#endif
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return);
+ IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return );
#else
if (m->m_len < sizeof(struct ip6_hdr)) {
m = m_pullup(m, sizeof(struct ip6_hdr));
- if (m == NULL)
+ if (m == NULL) {
return;
+ }
}
#endif
oip6 = mtod(m, struct ip6_hdr *);
/*
- * Multicast destination check. For unrecognized option errors,
- * this check has already done in ip6_unknown_opt(), so we can
- * check only for other errors.
+ * If the destination address of the erroneous packet is a multicast
+ * address, or the packet was sent using link-layer multicast,
+ * we should basically suppress sending an error (RFC 2463, Section
+ * 2.4).
+ * We have two exceptions (the item e.2 in that section):
+ * - the Pakcet Too Big message can be sent for path MTU discovery.
+ * - the Parameter Problem Message that can be allowed an icmp6 error
+ * in the option type field. This check has been done in
+ * ip6_unknown_opt(), so we can just check the type and code.
*/
- if ((m->m_flags & (M_BCAST|M_MCAST) ||
- IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
+ 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)))
+ (type != ICMP6_PARAM_PROB ||
+ code != ICMP6_PARAMPROB_OPTION))) {
goto freeit;
+ }
- /* Source address check. XXX: the case of anycast source? */
+ /*
+ * RFC 2463, 2.4 (e.5): source address check.
+ * XXX: the case of anycast source?
+ */
if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
- IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
+ IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) {
goto freeit;
+ }
/*
* If we are about to send ICMPv6 against ICMPv6 error/redirect,
* don't do it.
+ *
+ * We want to check for that for all ICMP error types, other than
+ * ICMP6_PARAM_PROB when it is being sent in response of first frag
+ * with incomplete header.
+ * That also includes the case when the first frag has incomplete ICMPv6
+ * header. The check below in that case would fail the IP6_EXTHDR_CHECK
+ * and would otherwise prevent us from sending the error back.
*/
- nxt = -1;
- off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
- if (off >= 0 && nxt == IPPROTO_ICMPV6) {
- struct icmp6_hdr *icp;
+ if (type != ICMP6_PARAM_PROB ||
+ code != ICMP6_PARAMPROB_FIRSTFRAG_INCOMP_HDR) {
+ int 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), return);
- icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
+ IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return );
+ 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;
- }
+ 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) {
- /*
- * ICMPv6 error
- * Special case: for redirect (which is
- * informational) we must not send icmp6 error.
- */
- icmp6stat.icp6s_canterror++;
- goto freeit;
+ if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
+ icp->icmp6_type == ND_REDIRECT) {
+ /*
+ * ICMPv6 error
+ * Special case: for redirect (which is
+ * informational) we must not send icmp6 error.
+ */
+ icmp6stat.icp6s_canterror++;
+ goto freeit;
+ } else {
+ /* ICMPv6 informational - send the error */
+ }
} else {
- /* ICMPv6 informational - send the error */
+ /* non-ICMPv6 - send the error */
}
- } else {
- /* non-ICMPv6 - send the error */
}
oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
* OK, ICMP6 can be generated.
*/
- if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
+ 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_PREPEND(m, preplen, M_DONTWAIT, 1);
+ if (m && m->m_len < preplen) {
m = m_pullup(m, preplen);
+ }
if (m == NULL) {
- nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
+ nd6log(debug, "ENOBUFS in icmp6_error %d\n", __LINE__);
return;
}
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;
+ in6_clearscope(&oip6->ip6_src);
+ in6_clearscope(&oip6->ip6_dst);
icmp6 = (struct icmp6_hdr *)(nip6 + 1);
- icmp6->icmp6_type = type;
- icmp6->icmp6_code = code;
+ icmp6->icmp6_type = (uint8_t)type;
+ icmp6->icmp6_code = (uint8_t)code;
icmp6->icmp6_pptr = htonl((u_int32_t)param);
/*
* icmp6_reflect() is designed to be in the input path.
- * icmp6_error() can be called from both input and outut path,
+ * icmp6_error() can be called from both input and output path,
* and if we are in output path rcvif could contain bogus value.
* clear m->m_pkthdr.rcvif for safety, we should have enough scope
* information in ip header (nip6).
*/
- m->m_pkthdr.rcvif = NULL;
+ if (flags & ICMP6_ERROR_RST_MRCVIF) {
+ m->m_pkthdr.rcvif = NULL;
+ }
icmp6stat.icp6s_outhist[type]++;
icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
return;
- freeit:
+freeit:
/*
- * If we can't tell wheter or not we can generate ICMP6, free it.
+ * If we can't tell whether or not we can generate ICMP6, free it.
*/
m_freem(m);
}
* Process a received ICMP6 message.
*/
int
-icmp6_input(mp, offp)
- struct mbuf **mp;
- int *offp;
+icmp6_input(struct mbuf **mp, int *offp, int proto)
{
+#pragma unused(proto)
struct mbuf *m = *mp, *n;
+ struct ifnet *ifp;
struct ip6_hdr *ip6, *nip6;
struct icmp6_hdr *icmp6, *nicmp6;
int off = *offp;
int icmp6len = m->m_pkthdr.len - *offp;
- int code, sum, noff;
+ int code, sum, noff, proxy = 0;
+
+ ifp = m->m_pkthdr.rcvif;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE);
/* m might change if M_LOOP. So, call mtod after this */
#endif
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
/*
* Locate icmp6 structure in mbuf, and check
* that not corrupted and of at least minimum length
*/
-
ip6 = mtod(m, struct ip6_hdr *);
if (icmp6len < sizeof(struct icmp6_hdr)) {
icmp6stat.icp6s_tooshort++;
goto freeit;
}
- /*
- * calculate the checksum
- */
#ifndef PULLDOWN_TEST
icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
#else
#endif
code = icmp6->icmp6_code;
+ /*
+ * Early check for RFC 6980
+ * Drop certain NDP packets if they came in fragmented
+ */
+ switch (icmp6->icmp6_type) {
+ case ND_ROUTER_SOLICIT:
+ case ND_ROUTER_ADVERT:
+ case ND_NEIGHBOR_SOLICIT:
+ case ND_NEIGHBOR_ADVERT:
+ case ND_REDIRECT:
+ if (m->m_pkthdr.pkt_flags & PKTF_REASSEMBLED) {
+ icmp6stat.icp6s_rfc6980_drop++;
+ goto freeit;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /* Apply rate limit before checksum validation. */
+ if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
+ icmp6stat.icp6s_toofreq++;
+ goto freeit;
+ }
+
+ /*
+ * Check multicast group membership.
+ * Note: SSM filters are not applied for ICMPv6 traffic.
+ */
+ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+ struct in6_multi *inm;
+
+ in6_multihead_lock_shared();
+ IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm);
+ in6_multihead_lock_done();
+
+ if (inm == NULL) {
+ /*
+ * Don't discard if this is a Neighbor Solicitation
+ * that needs to be proxied (see check down below.)
+ */
+ if (!(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)) {
+ ip6stat.ip6s_notmember++;
+ in6_ifstat_inc(m->m_pkthdr.rcvif,
+ ifs6_in_discard);
+ goto freeit;
+ }
+ } else {
+ IN6M_REMREF(inm);
+ }
+ }
+
+ /*
+ * calculate the checksum
+ */
if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
- nd6log((LOG_ERR,
+ nd6log(error,
"ICMP6 checksum error(%d|%x) %s\n",
- icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
+ icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src));
icmp6stat.icp6s_checksum++;
goto freeit;
}
-#if defined(NFAITH) && 0 < NFAITH
- if (faithprefix(&ip6->ip6_dst)) {
+ if (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST) {
/*
- * Deliver very specific ICMP6 type only.
- * This is important to deilver TOOBIG. Otherwise PMTUD
- * will not work.
+ * This is the special case of proxying NS (dst is either
+ * solicited-node multicast or unicast); process it locally
+ * but don't deliver it to sockets. It practically lets us
+ * steer the packet to nd6_prproxy_ns_input, where more
+ * specific tests and actions will be taken.
*/
switch (icmp6->icmp6_type) {
- case ICMP6_DST_UNREACH:
- case ICMP6_PACKET_TOO_BIG:
- case ICMP6_TIME_EXCEEDED:
+ case ND_NEIGHBOR_SOLICIT:
+ proxy = 1;
break;
default:
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)
+ if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) {
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
-
+ }
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:
+ case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */
code = PRC_UNREACH_NET;
break;
case ICMP6_DST_UNREACH_ADMIN:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
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:
/* I mean "source address was incorrect." */
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;
+ if (ntohl(icmp6->icmp6_mtu) < IPV6_MMTU) {
+ icmp6stat.icp6s_badpkttoobig++;
+ goto freeit;
+ }
code = PRC_MSGSIZE;
* intermediate extension headers.
*/
goto deliver;
- break;
case ICMP6_TIME_EXCEEDED:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
switch (code) {
case ICMP6_TIME_EXCEED_TRANSIT:
+ code = PRC_TIMXCEED_INTRANS;
+ break;
case ICMP6_TIME_EXCEED_REASSEMBLY:
- code += PRC_TIMXCEED_INTRANS;
+ code = PRC_TIMXCEED_REASS;
break;
default:
goto badcode;
}
goto deliver;
- break;
case ICMP6_PARAM_PROB:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
goto badcode;
}
goto deliver;
- break;
case ICMP6_ECHO_REQUEST:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
- if (code != 0)
+ if (code != 0) {
goto badcode;
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
/* Give up remote */
goto rate_limit_checked;
- break;
}
if ((n->m_flags & M_EXT) != 0
- || n->m_len < off + sizeof(struct icmp6_hdr)) {
+ || n->m_len < off + sizeof(struct icmp6_hdr)) {
struct mbuf *n0 = n;
const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
/* Give up remote */
m_freem(n0);
goto rate_limit_checked;
- break;
}
- MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */
+ MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */
if (n && maxlen >= MHLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
/* Give up remote */
m_freem(n0);
goto rate_limit_checked;
- break;
}
M_COPY_PKTHDR(n, n0);
/*
bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
noff = sizeof(struct ip6_hdr);
n->m_pkthdr.len = n->m_len =
- noff + sizeof(struct icmp6_hdr);
+ noff + sizeof(struct icmp6_hdr);
/*
* Adjust mbuf. ip6_plen will be adjusted in
* ip6_output().
} else {
nip6 = mtod(n, struct ip6_hdr *);
IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
- sizeof(*nicmp6));
+ sizeof(*nicmp6));
noff = off;
}
- nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
- nicmp6->icmp6_code = 0;
+ if (nicmp6 == NULL) {
+ panic("nicmp6 is NULL in %s, which isn't good!\n", __FUNCTION__);
+ } else {
+ 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);
}
goto rate_limit_checked;
- break;
case ICMP6_ECHO_REPLY:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
- if (code != 0)
+ if (code != 0) {
goto badcode;
+ }
break;
- case MLD6_LISTENER_QUERY:
- case MLD6_LISTENER_REPORT:
- if (icmp6len < sizeof(struct mld6_hdr))
+ case MLD_LISTENER_QUERY:
+ case MLD_LISTENER_REPORT:
+
+ if (icmp6len < sizeof(struct mld_hdr)) {
goto badlen;
- if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */
+ }
+ if (icmp6->icmp6_type == MLD_LISTENER_QUERY) { /* XXX: ugly... */
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
- else
+ } else {
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
/* give up local */
- mld6_input(m, off);
- m = NULL;
+ if (mld_input(m, off, icmp6len) == IPPROTO_DONE) {
+ m = NULL;
+ }
goto freeit;
}
- mld6_input(n, off);
+ if (mld_input(n, off, icmp6len) != IPPROTO_DONE) {
+ m_freem(n);
+ }
/* m stays. */
goto rate_limit_checked;
- break;
- case MLD6_LISTENER_DONE:
+ case MLD_LISTENER_DONE:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
- if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */
+ if (icmp6len < sizeof(struct mld_hdr)) { /* necessary? */
goto badlen;
- break; /* nothing to be done in kernel */
+ }
+ break; /* nothing to be done in kernel */
- case MLD6_MTRACE_RESP:
- case MLD6_MTRACE:
- /* XXX: these two are experimental. not officially defind. */
+ case MLD_MTRACE_RESP:
+ case MLD_MTRACE:
+ /* XXX: these two are experimental. not officially defined. */
/* XXX: per-interface statistics? */
- break; /* just pass it to applications */
+ break; /* just pass it to applications */
case ICMP6_NI_QUERY:
- if (!icmp6_nodeinfo)
+ if (!icmp6_nodeinfo) {
break;
-
- /* By RFC 4620 refuse to answer queries from global scope addresses */
- if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL)
+ }
+//### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not.
+ /* By RFC 4620 refuse to answer queries from global scope addresses */
+ if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL) {
break;
+ }
- if (icmp6len < sizeof(struct icmp6_nodeinfo))
+ if (icmp6len < sizeof(struct icmp6_nodeinfo)) {
goto badlen;
+ }
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
- return IPPROTO_DONE);
+ return IPPROTO_DONE);
#endif
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
- }
n = m_copy(m, 0, M_COPYALL);
- if (n)
+ if (n) {
n = ni6_input(n, off);
+ }
if (n) {
noff = sizeof(struct ip6_hdr);
icmp6stat.icp6s_reflect++;
icmp6_reflect(n, noff);
}
goto rate_limit_checked;
- break;
case ICMP6_WRUREPLY:
- if (code != 0)
+ if (code != 0) {
goto badcode;
+ }
break;
case ND_ROUTER_SOLICIT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
- if (code != 0)
+ if (code != 0) {
goto badcode;
- if (icmp6len < sizeof(struct nd_router_solicit))
+ }
+ if (icmp6len < sizeof(struct nd_router_solicit)) {
goto badlen;
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_rs_input(n, off, icmp6len);
/* m stays. */
goto rate_limit_checked;
- break;
case ND_ROUTER_ADVERT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
- if (code != 0)
+ if (code != 0) {
goto badcode;
- if (icmp6len < sizeof(struct nd_router_advert))
+ }
+ if (icmp6len < sizeof(struct nd_router_advert)) {
goto badlen;
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_ra_input(n, off, icmp6len);
/* m stays. */
goto rate_limit_checked;
- break;
case ND_NEIGHBOR_SOLICIT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
- if (code != 0)
+ if (code != 0) {
goto badcode;
- if (icmp6len < sizeof(struct nd_neighbor_solicit))
+ }
+ if (icmp6len < sizeof(struct nd_neighbor_solicit)) {
goto badlen;
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
+ if (proxy ||
+ ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL)) {
/* give up local */
nd6_ns_input(m, off, icmp6len);
m = NULL;
nd6_ns_input(n, off, icmp6len);
/* m stays. */
goto rate_limit_checked;
- break;
case ND_NEIGHBOR_ADVERT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
- if (code != 0)
+ if (code != 0) {
goto badcode;
- if (icmp6len < sizeof(struct nd_neighbor_advert))
+ }
+ if (icmp6len < sizeof(struct nd_neighbor_advert)) {
goto badlen;
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
nd6_na_input(n, off, icmp6len);
/* m stays. */
goto rate_limit_checked;
- break;
case ND_REDIRECT:
icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
- if (code != 0)
+ if (code != 0) {
goto badcode;
- if (icmp6len < sizeof(struct nd_redirect))
+ }
+ if (icmp6len < sizeof(struct nd_redirect)) {
goto badlen;
-
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
/* give up local */
- icmp6_redirect_input(m, off);
+ icmp6_redirect_input(m, off, icmp6len);
m = NULL;
goto freeit;
}
- icmp6_redirect_input(n, off);
+ icmp6_redirect_input(n, off, icmp6len);
/* m stays. */
goto rate_limit_checked;
- break;
case ICMP6_ROUTER_RENUMBERING:
if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
- code != ICMP6_ROUTER_RENUMBERING_RESULT)
+ code != ICMP6_ROUTER_RENUMBERING_RESULT) {
goto badcode;
- if (icmp6len < sizeof(struct icmp6_router_renum))
+ }
+ if (icmp6len < sizeof(struct icmp6_router_renum)) {
goto badlen;
+ }
break;
default:
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
- }
-
- nd6log((LOG_DEBUG,
+ nd6log(debug,
"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));
+ m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0);
if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
/* ICMPv6 error: MUST deliver it by spec... */
code = PRC_NCMDS;
} else {
/* ICMPv6 informational: MUST not deliver */
goto rate_limit_checked;
- break;
- }
- deliver:
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
}
-
+deliver:
if (icmp6_notify_error(m, off, icmp6len, code)) {
/* In this case, m should've been freed. */
- return(IPPROTO_DONE);
+ return IPPROTO_DONE;
}
break;
- badcode:
+badcode:
icmp6stat.icp6s_badcode++;
break;
- badlen:
+badlen:
icmp6stat.icp6s_badlen++;
break;
}
- if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
- }
rate_limit_checked:
- /* deliver the packet to appropriate sockets */
icmp6_rip6_input(&m, *offp);
-
return IPPROTO_DONE;
- freeit:
+freeit:
m_freem(m);
return IPPROTO_DONE;
}
static int
-icmp6_notify_error(m, off, icmp6len, code)
- struct mbuf *m;
- int off, icmp6len, code;
+icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
{
struct icmp6_hdr *icmp6;
struct ip6_hdr *eip6;
}
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off,
- sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
- return -1);
+ sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
+ return -1);
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));
+ sizeof(*icmp6) + sizeof(struct ip6_hdr));
if (icmp6 == NULL) {
icmp6stat.icp6s_tooshort++;
- return(-1);
+ return -1;
}
#endif
eip6 = (struct ip6_hdr *)(icmp6 + 1);
+ bzero(&icmp6dst, sizeof(icmp6dst));
/* Detect the upper level protocol */
{
- void (*ctlfunc)(int, struct sockaddr *, void *);
+ void (*ctlfunc)(int, struct sockaddr *, void *, struct ifnet *);
u_int8_t nxt = eip6->ip6_nxt;
int eoff = off + sizeof(struct icmp6_hdr) +
- sizeof(struct ip6_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;
case IPPROTO_DSTOPTS:
case IPPROTO_AH:
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, eoff +
- sizeof(struct ip6_ext),
- return -1);
+ IP6_EXTHDR_CHECK(m, 0,
+ eoff + sizeof(struct ip6_ext), return -1);
eh = (struct ip6_ext *)(mtod(m, caddr_t)
- + eoff);
+ + eoff);
#else
IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
- eoff, sizeof(*eh));
+ eoff, sizeof(*eh));
if (eh == NULL) {
icmp6stat.icp6s_tooshort++;
- return(-1);
+ return -1;
}
#endif
-
- if (nxt == IPPROTO_AH)
+
+ if (nxt == IPPROTO_AH) {
eoff += (eh->ip6e_len + 2) << 2;
- else
+ } 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),
- return -1);
- rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
- + eoff);
+ return -1);
+ rth = (struct ip6_rthdr *)
+ (mtod(m, caddr_t) + eoff);
#else
IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
- eoff, sizeof(*rth));
+ eoff, sizeof(*rth));
if (rth == NULL) {
icmp6stat.icp6s_tooshort++;
- return(-1);
+ return -1;
}
#endif
rthlen = (rth->ip6r_len + 1) << 3;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
- return -1);
+ return -1);
rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
#else
IP6_EXTHDR_GET(rth0,
- struct ip6_rthdr0 *, m,
- eoff, rthlen);
+ struct ip6_rthdr0 *, m,
+ eoff, rthlen);
if (rth0 == NULL) {
icmp6stat.icp6s_tooshort++;
- return(-1);
+ return -1;
}
#endif
/* just ignore a bogus header */
if ((rth0->ip6r0_len % 2) == 0 &&
- (hops = rth0->ip6r0_len/2))
- finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
+ (hops = rth0->ip6r0_len / 2)) {
+ icmp6dst.sin6_addr = *((struct in6_addr *)(void *)(rth0 + 1) + (hops - 1));
+ }
}
eoff += rthlen;
nxt = rth->ip6r_nxt;
case IPPROTO_FRAGMENT:
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, 0, eoff +
- sizeof(struct ip6_frag),
- return -1);
+ sizeof(struct ip6_frag),
+ return -1);
fh = (struct ip6_frag *)(mtod(m, caddr_t)
- + eoff);
+ + eoff);
#else
IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
- eoff, sizeof(*fh));
+ eoff, sizeof(*fh));
if (fh == NULL) {
icmp6stat.icp6s_tooshort++;
- return(-1);
+ return -1;
}
#endif
/*
* we'll go to the notify label for path MTU
* discovery.
*/
- if (fh->ip6f_offlg & IP6F_OFF_MASK)
+ if (fh->ip6f_offlg & IP6F_OFF_MASK) {
goto notify;
+ }
eoff += sizeof(struct ip6_frag);
nxt = fh->ip6f_nxt;
goto notify;
}
}
- 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));
+ sizeof(*icmp6) + sizeof(struct ip6_hdr));
if (icmp6 == NULL) {
icmp6stat.icp6s_tooshort++;
- return(-1);
+ return -1;
}
#endif
+ /*
+ * retrieve parameters from the inner IPv6 header, and convert
+ * them into sockaddr structures.
+ * XXX: there is no guarantee that the source or destination
+ * addresses of the inner packet are in the same scope as
+ * the addresses of the icmp packet. But there is no other
+ * way to determine the zone.
+ */
eip6 = (struct ip6_hdr *)(icmp6 + 1);
- bzero(&icmp6dst, sizeof(icmp6dst));
+
icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
icmp6dst.sin6_family = AF_INET6;
- if (finaldst == NULL)
+ if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr)) {
icmp6dst.sin6_addr = eip6->ip6_dst;
- else
- icmp6dst.sin6_addr = *finaldst;
- icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
- &icmp6dst.sin6_addr);
-#ifndef SCOPEDROUTING
- if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
- NULL, NULL)) {
- /* should be impossbile */
- nd6log((LOG_DEBUG,
- "icmp6_notify_error: in6_embedscope failed\n"));
+ }
+ if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) {
goto freeit;
}
-#endif
-
- /*
- * retrieve parameters from the inner IPv6 header, and convert
- * them into sockaddr structures.
- */
bzero(&icmp6src, sizeof(icmp6src));
icmp6src.sin6_len = sizeof(struct sockaddr_in6);
icmp6src.sin6_family = AF_INET6;
icmp6src.sin6_addr = eip6->ip6_src;
- icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
- &icmp6src.sin6_addr);
-#ifndef SCOPEDROUTING
- if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
- NULL, NULL)) {
- /* should be impossbile */
- nd6log((LOG_DEBUG,
- "icmp6_notify_error: in6_embedscope failed\n"));
+ if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) {
goto freeit;
}
-#endif
icmp6src.sin6_flowinfo =
- (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
+ (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
- if (finaldst == NULL)
- finaldst = &eip6->ip6_dst;
ip6cp.ip6c_m = m;
ip6cp.ip6c_icmp6 = icmp6;
ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
ip6cp.ip6c_off = eoff;
- ip6cp.ip6c_finaldst = finaldst;
+ ip6cp.ip6c_finaldst = &icmp6dst.sin6_addr;
ip6cp.ip6c_src = &icmp6src;
ip6cp.ip6c_nxt = nxt;
if (icmp6type == ICMP6_PACKET_TOO_BIG) {
notifymtu = ntohl(icmp6->icmp6_mtu);
ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
- icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
+ icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
}
- ctlfunc = (void (*)(int, struct sockaddr *, void *))
- (ip6_protox[nxt]->pr_ctlinput);
+ ctlfunc = ip6_protox[nxt]->pr_ctlinput;
if (ctlfunc) {
+ LCK_MTX_ASSERT(inet6_domain_mutex, LCK_MTX_ASSERT_OWNED);
+
+ lck_mtx_unlock(inet6_domain_mutex);
+
(void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
- &ip6cp);
+ &ip6cp, m->m_pkthdr.rcvif);
+
+ lck_mtx_lock(inet6_domain_mutex);
}
}
- return(0);
+ return 0;
freeit:
m_freem(m);
- return(-1);
+ return -1;
}
void
-icmp6_mtudisc_update(ip6cp, validated)
- struct ip6ctlparam *ip6cp;
- int validated;
+icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
{
struct in6_addr *dst = ip6cp->ip6c_finaldst;
struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
- struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
+ struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
u_int mtu = ntohl(icmp6->icmp6_mtu);
struct rtentry *rt = NULL;
struct sockaddr_in6 sin6;
-
- if (!validated)
- return;
/*
- * In case the suggested mtu is less than IPV6_MMTU, we
- * only need to remember that it was for above mentioned
- * "alwaysfrag" case.
- * Try to be as close to the spec as possible.
+ * we reject ICMPv6 too big with abnormally small value.
+ * XXX what is the good definition of "abnormally small"?
*/
- if (mtu < IPV6_MMTU)
- mtu = IPV6_MMTU - 8;
+ if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) {
+ return;
+ }
+
+ if (!validated) {
+ return;
+ }
+
+ /* Limit the MTU to the minimum IPv6 MTU */
+ if (mtu < IPV6_MMTU) {
+ mtu = IPV6_MMTU;
+ }
bzero(&sin6, sizeof(sin6));
sin6.sin6_family = PF_INET6;
htons(m->m_pkthdr.rcvif->if_index);
}
/* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
- rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_CLONING | RTF_PRCLONING);
+ /*
+ * XXX On a side note, for asymmetric data-path
+ * the lookup on receive interace is probably not
+ * what we want to do.
+ * That requires looking at the cached route for the
+ * protocol control block.
+ */
+ rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0,
+ RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index);
if (rt != NULL) {
RT_LOCK(rt);
if ((rt->rt_flags & RTF_HOST) &&
- !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
- if (mtu < IPV6_MMTU) {
- /* xxx */
- rt->rt_rmx.rmx_locks |= RTV_MTU;
- } else if (mtu < rt->rt_ifp->if_mtu &&
- rt->rt_rmx.rmx_mtu > mtu) {
- icmp6stat.icp6s_pmtuchg++;
- rt->rt_rmx.rmx_mtu = mtu;
- }
+ !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
+ mtu < IN6_LINKMTU(rt->rt_ifp) &&
+ rt->rt_rmx.rmx_mtu > mtu) {
+ icmp6stat.icp6s_pmtuchg++;
+ rt->rt_rmx.rmx_mtu = mtu;
}
RT_UNLOCK(rt);
rtfree(rt);
/*
* Process a Node Information Query packet, based on
* draft-ietf-ipngwg-icmp-name-lookups-07.
- *
+ *
* Spec incompatibilities:
* - IPv6 Subject address handling
* - IPv4 Subject address handling support missing
* - joins NI group address at in6_ifattach() time only, does not cope
* with hostname changes by sethostname(3)
*/
-#define hostnamelen strlen(hostname)
+#define hostnamelen (uint32_t)strlen(hostname)
static struct mbuf *
-ni6_input(m, off)
- struct mbuf *m;
- int off;
+ni6_input(struct mbuf *m, int off)
{
struct icmp6_nodeinfo *ni6, *nni6;
struct mbuf *n = NULL;
int subjlen;
int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
struct ni_reply_fqdn *fqdn;
- int addrs; /* for NI_QTYPE_NODEADDR */
+ int addrs; /* for NI_QTYPE_NODEADDR */
struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
struct ip6_hdr *ip6;
- int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
+ int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
char *subj = NULL;
- struct in6_ifaddr *ia6 = NULL;
ip6 = mtod(m, struct ip6_hdr *);
#ifndef PULLDOWN_TEST
}
#endif
+ /*
+ * Validate IPv6 source address.
+ * The default configuration MUST be to refuse answering queries from
+ * global-scope addresses according to RFC4602.
+ * Notes:
+ * - it's not very clear what "refuse" means; this implementation
+ * simply drops it.
+ * - it's not very easy to identify global-scope (unicast) addresses
+ * since there are many prefixes for them. It should be safer
+ * and in practice sufficient to check "all" but loopback and
+ * link-local (note that site-local unicast was deprecated and
+ * ULA is defined as global scope-wise)
+ */
+ if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
+ !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
+ !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) {
+ goto bad;
+ }
+
/*
* Validate IPv6 destination address.
*
* The Responder must discard the Query without further processing
* unless it is one of the Responder's unicast or anycast addresses, or
* a link-local scope multicast address which the Responder has joined.
- * [icmp-name-lookups-07, Section 4.]
+ * [RFC4602, Section 5.]
*/
- bzero(&sin6, sizeof(sin6));
- sin6.sin6_family = AF_INET6;
- sin6.sin6_len = sizeof(struct sockaddr_in6);
- bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
- /* XXX scopeid */
- if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
- /* unicast/anycast, fine */
- if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
- (icmp6_nodeinfo & 4) == 0) {
- ifafree(&ia6->ia_ifa);
- ia6 = NULL;
- nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
- "a temporary address in %s:%d",
- __FILE__, __LINE__));
+ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+ if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst) &&
+ !IN6_IS_ADDR_MC_UNICAST_BASED_LINKLOCAL(&ip6->ip6_dst)) {
goto bad;
}
- ifafree(&ia6->ia_ifa);
- ia6 = NULL;
- } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
- ; /* link-local multicast, fine */
- else
- goto bad;
+ /* else it's a link-local multicast, fine */
+ } else { /* unicast or anycast */
+ uint32_t ia6_flags;
+
+ if (ip6_getdstifaddr_info(m, NULL, &ia6_flags) != 0) {
+ goto bad; /* XXX impossible */
+ }
+ if ((ia6_flags & IN6_IFF_TEMPORARY) &&
+ !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
+ nd6log(debug, "ni6_input: ignore node info to a temporary address in %s:%d",
+ __func__, __LINE__);
+ goto bad;
+ }
+ }
/* validate query Subject field. */
qtype = ntohs(ni6->ni_qtype);
case NI_QTYPE_NOOP:
case NI_QTYPE_SUPTYPES:
/* 07 draft */
- if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
+ if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) {
break;
- /* FALLTHROUGH */
+ }
+ OS_FALLTHROUGH;
case NI_QTYPE_FQDN:
case NI_QTYPE_NODEADDR:
+ case NI_QTYPE_IPV4ADDR:
switch (ni6->ni_code) {
case ICMP6_NI_SUBJ_IPV6:
#if ICMP6_NI_SUBJ_IPV6 != 0
break;
}
#if ICMP6_NI_SUBJ_IPV6 != 0
- if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
+ if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) {
goto bad;
+ }
#endif
- if (subjlen != sizeof(sin6.sin6_addr))
+ if (subjlen != sizeof(struct in6_addr)) {
goto bad;
+ }
/*
* Validate Subject address.
m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
subjlen, (caddr_t)&sin6.sin6_addr);
sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
- &sin6.sin6_addr);
-#ifndef SCOPEDROUTING
- in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
-#endif
+ &sin6.sin6_addr);
+ in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL,
+ NULL);
bzero(&sin6_d, sizeof(sin6_d));
sin6_d.sin6_family = AF_INET6; /* not used, actually */
sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
sin6_d.sin6_addr = ip6->ip6_dst;
sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
- &ip6->ip6_dst);
-#ifndef SCOPEDROUTING
- in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
-#endif
+ &ip6->ip6_dst);
+ in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL,
+ NULL);
subj = (char *)&sin6;
- if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
+ if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) {
break;
+ }
/*
* XXX if we are to allow other cases, we should really
* be careful about scope here.
* basically, we should disallow queries toward IPv6
- * destination X with subject Y, if scope(X) > scope(Y).
+ * destination X with subject Y,
+ * if scope(X) > scope(Y).
* if we allow scope(X) > scope(Y), it will result in
* information leakage across scope boundary.
*/
* wildcard match, if gethostname(3) side has
* truncated hostname.
*/
+ lck_mtx_lock(&hostname_lock);
n = ni6_nametodns(hostname, hostnamelen, 0);
- if (!n || n->m_next || n->m_len == 0)
+ lck_mtx_unlock(&hostname_lock);
+ if (!n || n->m_next || n->m_len == 0) {
goto bad;
+ }
IP6_EXTHDR_GET(subj, char *, m,
off + sizeof(struct icmp6_nodeinfo), subjlen);
- if (subj == NULL)
+ if (subj == NULL) {
goto bad;
+ }
if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
- n->m_len)) {
+ n->m_len)) {
goto bad;
}
m_freem(n);
n = NULL;
break;
- case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
+ case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
default:
goto bad;
}
/* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
switch (qtype) {
case NI_QTYPE_FQDN:
- if ((icmp6_nodeinfo & 1) == 0)
+ if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) {
goto bad;
+ }
break;
case NI_QTYPE_NODEADDR:
- if ((icmp6_nodeinfo & 2) == 0)
+ case NI_QTYPE_IPV4ADDR:
+ if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) {
goto bad;
+ }
break;
}
/* guess reply length */
switch (qtype) {
case NI_QTYPE_NOOP:
- break; /* no reply data */
+ break; /* no reply data */
case NI_QTYPE_SUPTYPES:
replylen += sizeof(u_int32_t);
break;
case NI_QTYPE_NODEADDR:
addrs = ni6_addrs(ni6, &ifp, subj);
if ((replylen += addrs * (sizeof(struct in6_addr) +
- sizeof(u_int32_t))) > MCLBYTES)
+ sizeof(u_int32_t))) > MCLBYTES) {
replylen = MCLBYTES; /* XXX: will truncate pkt later */
+ }
+ break;
+ case NI_QTYPE_IPV4ADDR:
+ /* unsupported - should respond with unknown Qtype? */
break;
default:
/*
* XXX: We must return a reply with the ICMP6 code
- * `unknown Qtype' in this case. However we regard the case
+ * `unknown Qtype' in this case. However we regard the case
* as an FQDN query for backward compatibility.
* Older versions set a random value to this field,
* so it rarely varies in the defined qtypes.
}
/* allocate an mbuf to reply. */
- MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */
+ MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */
if (n == NULL) {
m_freem(m);
- return(NULL);
+ if (ifp != NULL) {
+ ifnet_release(ifp);
+ }
+ return NULL;
}
M_COPY_PKTHDR(n, m); /* just for recvif */
if (replylen > MHLEN) {
{
u_int32_t v;
nni6->ni_code = ICMP6_NI_SUCCESS;
- nni6->ni_flags = htons(0x0000); /* raw bitmap */
+ nni6->ni_flags = htons(0x0000); /* raw bitmap */
/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
v = (u_int32_t)htonl(0x0000000f);
bcopy(&v, nni6 + 1, sizeof(u_int32_t));
case NI_QTYPE_FQDN:
nni6->ni_code = ICMP6_NI_SUCCESS;
fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
- sizeof(struct ip6_hdr) +
- sizeof(struct icmp6_nodeinfo));
+ sizeof(struct ip6_hdr) +
+ sizeof(struct icmp6_nodeinfo));
nni6->ni_flags = 0; /* XXX: meaningless TTL */
- fqdn->ni_fqdn_ttl = 0; /* ditto. */
+ fqdn->ni_fqdn_ttl = 0; /* ditto. */
/*
* XXX do we really have FQDN in variable "hostname"?
*/
+ lck_mtx_lock(&hostname_lock);
n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
- if (n->m_next == NULL)
+ lck_mtx_unlock(&hostname_lock);
+ if (n->m_next == NULL) {
goto bad;
+ }
/* XXX we assume that n->m_next is not a chain */
- if (n->m_next->m_next != NULL)
+ if (n->m_next->m_next != NULL) {
goto bad;
+ }
n->m_pkthdr.len += n->m_next->m_len;
break;
case NI_QTYPE_NODEADDR:
nni6->ni_code = ICMP6_NI_SUCCESS;
n->m_pkthdr.len = n->m_len =
sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
- lenlim = M_TRAILINGSPACE(n);
+ lenlim = (int)M_TRAILINGSPACE(n);
copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
/* XXX: reset mbuf length */
n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
- sizeof(struct icmp6_nodeinfo) + copied;
+ sizeof(struct icmp6_nodeinfo) + copied;
break;
}
default:
- break; /* XXX impossible! */
+ break; /* XXX impossible! */
}
nni6->ni_type = ICMP6_NI_REPLY;
m_freem(m);
- return(n);
+ if (ifp != NULL) {
+ ifnet_release(ifp);
+ }
+ return n;
- bad:
+bad:
m_freem(m);
- if (n)
+ if (n) {
m_freem(n);
- return(NULL);
+ }
+ if (ifp != NULL) {
+ ifnet_release(ifp);
+ }
+ return NULL;
}
#undef hostnamelen
* treated as truncated name (two \0 at the end). this is a wild guess.
*/
static struct mbuf *
-ni6_nametodns(name, namelen, old)
- const char *name;
- int namelen;
- int old; /* return pascal string if non-zero */
+ni6_nametodns(
+ const char *name,
+ uint32_t namelen,
+ int old) /* return pascal string if non-zero */
{
struct mbuf *m;
char *cp, *ep;
const char *p, *q;
- int i, len, nterm;
+ int i, nterm;
+ uint32_t len;
- if (old)
+ if (old) {
len = namelen + 1;
- else
+ } else {
len = MCLBYTES;
+ }
/* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
MGET(m, M_DONTWAIT, MT_DATA);
if (m && len > MLEN) {
MCLGET(m, M_DONTWAIT);
- if ((m->m_flags & M_EXT) == 0)
+ if ((m->m_flags & M_EXT) == 0) {
goto fail;
+ }
}
- if (!m)
+ if (!m) {
goto fail;
+ }
m->m_next = NULL;
if (old) {
m->m_len = len;
- *mtod(m, char *) = namelen;
+ *mtod(m, char *) = (char)namelen;
bcopy(name, mtod(m, char *) + 1, namelen);
return m;
} else {
ep = mtod(m, char *) + M_TRAILINGSPACE(m);
/* if not certain about my name, return empty buffer */
- if (namelen == 0)
+ if (namelen == 0) {
return m;
+ }
/*
* guess if it looks like shortened hostname, or FQDN.
*/
i = 0;
for (p = name; p < name + namelen; p++) {
- if (*p && *p == '.')
+ if (*p && *p == '.') {
i++;
+ }
}
- if (i < 2)
+ if (i < 2) {
nterm = 2;
- else
+ } else {
nterm = 1;
+ }
p = name;
while (cp < ep && p < name + namelen) {
i = 0;
- for (q = p; q < name + namelen && *q && *q != '.'; q++)
+ for (q = p; q < name + namelen && *q && *q != '.'; q++) {
i++;
+ }
/* result does not fit into mbuf */
- if (cp + i + 1 >= ep)
+ if (cp + i + 1 >= ep) {
goto fail;
+ }
/*
* DNS label length restriction, RFC1035 page 8.
* "i == 0" case is included here to avoid returning
* 0-length label on "foo..bar".
*/
- if (i <= 0 || i >= 64)
+ if (i <= 0 || i >= 64) {
goto fail;
- *cp++ = i;
+ }
+ *cp++ = (char)i;
bcopy(p, cp, i);
cp += i;
p = q;
- if (p < name + namelen && *p == '.')
+ if (p < name + namelen && *p == '.') {
p++;
+ }
}
/* termination */
- if (cp + nterm >= ep)
+ if (cp + nterm >= ep) {
goto fail;
- while (nterm-- > 0)
+ }
+ while (nterm-- > 0) {
*cp++ = '\0';
- m->m_len = cp - mtod(m, char *);
+ }
+ m->m_len = (int32_t)(cp - mtod(m, char *));
return m;
}
panic("should not reach here");
/* NOTREACHED */
- fail:
- if (m)
+fail:
+ if (m) {
m_freem(m);
+ }
return NULL;
}
* XXX upper/lowercase match (see RFC2065)
*/
static int
-ni6_dnsmatch(a, alen, b, blen)
- const char *a;
- int alen;
- const char *b;
- int blen;
+ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
{
const char *a0, *b0;
int l;
/* simplest case - need validation? */
- if (alen == blen && bcmp(a, b, alen) == 0)
+ if (alen == blen && bcmp(a, b, alen) == 0) {
return 1;
+ }
a0 = a;
b0 = b;
/* termination is mandatory */
- if (alen < 2 || blen < 2)
+ if (alen < 2 || blen < 2) {
return 0;
- if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
+ }
+ if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') {
return 0;
+ }
alen--;
blen--;
while (a - a0 < alen && b - b0 < blen) {
- if (a - a0 + 1 > alen || b - b0 + 1 > blen)
+ if (a - a0 + 1 > alen || b - b0 + 1 > blen) {
return 0;
+ }
- if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
+ if ((signed char)a[0] < 0 || (signed char)b[0] < 0) {
return 0;
+ }
/* we don't support compression yet */
- if (a[0] >= 64 || b[0] >= 64)
+ if (a[0] >= 64 || b[0] >= 64) {
return 0;
+ }
/* truncated case */
- if (a[0] == 0 && a - a0 == alen - 1)
+ if (a[0] == 0 && a - a0 == alen - 1) {
return 1;
- if (b[0] == 0 && b - b0 == blen - 1)
+ }
+ if (b[0] == 0 && b - b0 == blen - 1) {
return 1;
- if (a[0] == 0 || b[0] == 0)
+ }
+ if (a[0] == 0 || b[0] == 0) {
return 0;
+ }
- if (a[0] != b[0])
+ if (a[0] != b[0]) {
return 0;
+ }
l = a[0];
- if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
+ if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) {
return 0;
- if (bcmp(a + 1, b + 1, l) != 0)
+ }
+ if (bcmp(a + 1, b + 1, l) != 0) {
return 0;
+ }
a += 1 + l;
b += 1 + l;
}
- if (a - a0 == alen && b - b0 == blen)
+ if (a - a0 == alen && b - b0 == blen) {
return 1;
- else
+ } else {
return 0;
+ }
}
/*
* calculate the number of addresses to be returned in the node info reply.
*/
static int
-ni6_addrs(ni6, ifpp, subj)
- struct icmp6_nodeinfo *ni6;
- struct ifnet **ifpp;
- char *subj;
+ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj)
{
struct ifnet *ifp;
struct in6_ifaddr *ifa6;
int addrs = 0, addrsofif, iffound = 0;
int niflags = ni6->ni_flags;
+ if (ifpp != NULL) {
+ *ifpp = NULL;
+ }
+
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
switch (ni6->ni_code) {
case ICMP6_NI_SUBJ_IPV6:
- if (subj == NULL) /* must be impossible... */
- return(0);
- subj_ip6 = (struct sockaddr_in6 *)subj;
+ if (subj == NULL) { /* must be impossible... */
+ return 0;
+ }
+ subj_ip6 = (struct sockaddr_in6 *)(void *)subj;
break;
default:
/*
* XXX: we only support IPv6 subject address for
* this Qtype.
*/
- return(0);
+ return 0;
}
}
ifnet_lock_shared(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
{
- if (ifa->ifa_addr->sa_family != AF_INET6)
+ IFA_LOCK(ifa);
+ if (ifa->ifa_addr->sa_family != AF_INET6) {
+ IFA_UNLOCK(ifa);
continue;
+ }
ifa6 = (struct in6_ifaddr *)ifa;
if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
- &ifa6->ia_addr.sin6_addr))
+ &ifa6->ia_addr.sin6_addr)) {
iffound = 1;
+ }
/*
* IPv4-mapped addresses can only be returned by a
/* What do we have to do about ::1? */
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
case IPV6_ADDR_SCOPE_LINKLOCAL:
- if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
+ if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
- if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
+ if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
break;
case IPV6_ADDR_SCOPE_GLOBAL:
- if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
+ if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
break;
default:
+ IFA_UNLOCK(ifa);
continue;
}
* XXX: just experimental. not in the spec.
*/
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
- (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
+ (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
+ IFA_UNLOCK(ifa);
continue; /* we need only unicast addresses */
+ }
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
- (icmp6_nodeinfo & 4) == 0) {
+ (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
+ IFA_UNLOCK(ifa);
continue;
}
addrsofif++; /* count the address */
+ IFA_UNLOCK(ifa);
}
ifnet_lock_done(ifp);
if (iffound) {
- *ifpp = ifp;
+ if (ifpp != NULL) {
+ *ifpp = ifp;
+ ifnet_reference(ifp);
+ }
ifnet_head_done();
- return(addrsofif);
+ return addrsofif;
}
addrs += addrsofif;
}
ifnet_head_done();
- return(addrs);
+ return addrs;
}
static int
-ni6_store_addrs(ni6, nni6, ifp0, resid)
- struct icmp6_nodeinfo *ni6, *nni6;
- struct ifnet *ifp0;
- int resid;
+ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
+ struct ifnet *ifp0, int resid)
{
struct ifnet *ifp = ifp0;
struct in6_ifaddr *ifa6;
u_char *cp = (u_char *)(nni6 + 1);
int niflags = ni6->ni_flags;
u_int32_t ltime;
- struct timeval timenow;
-
- getmicrotime(&timenow);
-
- if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
- return(0); /* needless to copy */
+ uint64_t now = net_uptime();
- again:
+ if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) {
+ return 0; /* needless to copy */
+ }
+again:
ifnet_head_lock_shared();
- if (ifp == NULL) ifp = TAILQ_FIRST(&ifnet_head);
-
+ if (ifp == NULL) {
+ ifp = TAILQ_FIRST(&ifnet_head);
+ }
+
for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
ifnet_lock_shared(ifp);
for (ifa = ifp->if_addrlist.tqh_first; ifa;
- ifa = ifa->ifa_list.tqe_next)
- {
- if (ifa->ifa_addr->sa_family != AF_INET6)
+ ifa = ifa->ifa_list.tqe_next) {
+ struct in6_addrlifetime_i *lt;
+
+ IFA_LOCK(ifa);
+ if (ifa->ifa_addr->sa_family != AF_INET6) {
+ IFA_UNLOCK(ifa);
continue;
+ }
ifa6 = (struct in6_ifaddr *)ifa;
if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
*/
/* record the interface for later search */
- if (ifp_dep == NULL)
+ if (ifp_dep == NULL) {
ifp_dep = ifp;
+ }
+ IFA_UNLOCK(ifa);
continue;
- }
- else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
- allow_deprecated != 0)
+ } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
+ allow_deprecated != 0) {
+ IFA_UNLOCK(ifa);
continue; /* we now collect deprecated addrs */
-
+ }
/* What do we have to do about ::1? */
switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
case IPV6_ADDR_SCOPE_LINKLOCAL:
- if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
+ if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
break;
case IPV6_ADDR_SCOPE_SITELOCAL:
- if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
+ if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
break;
case IPV6_ADDR_SCOPE_GLOBAL:
- if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
+ if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
break;
default:
+ IFA_UNLOCK(ifa);
continue;
}
/*
* check if anycast is okay.
- * XXX: just experimental. not in the spec.
+ * XXX: just experimental. not in the spec.
*/
if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
- (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
+ (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) {
+ IFA_UNLOCK(ifa);
continue;
+ }
if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
- (icmp6_nodeinfo & 4) == 0) {
+ (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
+ IFA_UNLOCK(ifa);
continue;
}
/* now we can copy the address */
if (resid < sizeof(struct in6_addr) +
sizeof(u_int32_t)) {
+ IFA_UNLOCK(ifa);
/*
* We give up much more copy.
* Set the truncate flag and return.
*/
nni6->ni_flags |=
- NI_NODEADDR_FLAG_TRUNCATE;
+ NI_NODEADDR_FLAG_TRUNCATE;
ifnet_lock_done(ifp);
ifnet_head_done();
- return(copied);
+ return copied;
}
/*
* address configuration by DHCPv6, so the former
* case can't happen.
*/
- if (ifa6->ia6_lifetime.ia6t_expire == 0)
+ lt = &ifa6->ia6_lifetime;
+ if (lt->ia6ti_expire == 0) {
ltime = ND6_INFINITE_LIFETIME;
- else {
- if (ifa6->ia6_lifetime.ia6t_expire >
- timenow.tv_sec)
- ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - timenow.tv_sec);
- else
+ } else {
+ if (lt->ia6ti_expire > now) {
+ ltime = htonl((uint32_t)(lt->ia6ti_expire - now));
+ } else {
ltime = 0;
+ }
}
-
+
bcopy(<ime, cp, sizeof(u_int32_t));
cp += sizeof(u_int32_t);
/* copy the address itself */
bcopy(&ifa6->ia_addr.sin6_addr, cp,
- sizeof(struct in6_addr));
+ sizeof(struct in6_addr));
/* XXX: KAME link-local hack; remove ifindex */
- if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
- ((struct in6_addr *)cp)->s6_addr16[1] = 0;
+ if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) {
+ ((struct in6_addr *)(void *)cp)->s6_addr16[1] = 0;
+ }
cp += sizeof(struct in6_addr);
-
+
resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
copied += (sizeof(struct in6_addr) +
- sizeof(u_int32_t));
+ sizeof(u_int32_t));
+ IFA_UNLOCK(ifa);
}
ifnet_lock_done(ifp);
- if (ifp0) /* we need search only on the specified IF */
+ if (ifp0) { /* we need search only on the specified IF */
break;
+ }
}
ifnet_head_done();
goto again;
}
- return(copied);
+ return copied;
}
/*
* XXX almost dup'ed code with rip6_input.
*/
static int
-icmp6_rip6_input(mp, off)
- struct mbuf **mp;
- int off;
+icmp6_rip6_input(struct mbuf **mp, int off)
{
struct mbuf *m = *mp;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct sockaddr_in6 rip6src;
struct icmp6_hdr *icmp6;
struct mbuf *opts = NULL;
+ int ret = 0;
+ struct ifnet *ifp = m->m_pkthdr.rcvif;
#ifndef PULLDOWN_TEST
/* this is assumed to be safe. */
}
#endif
+ /*
+ * XXX: the address may have embedded scope zone ID, which should be
+ * hidden from applications.
+ */
bzero(&rip6src, sizeof(rip6src));
- rip6src.sin6_len = sizeof(struct sockaddr_in6);
rip6src.sin6_family = AF_INET6;
- /* KAME hack: recover scopeid */
- (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
+ rip6src.sin6_len = sizeof(struct sockaddr_in6);
+ rip6src.sin6_addr = ip6->ip6_src;
+ if (sa6_recoverscope(&rip6src, TRUE)) {
+ return IPPROTO_DONE;
+ }
- lck_rw_lock_shared(ripcbinfo.mtx);
+ lck_rw_lock_shared(ripcbinfo.ipi_lock);
LIST_FOREACH(in6p, &ripcb, inp_list)
{
- if ((in6p->inp_vflag & INP_IPV6) == 0)
+ if ((in6p->inp_vflag & INP_IPV6) == 0) {
continue;
-#if HAVE_NRL_INPCB
- if (!(in6p->in6p_flags & INP_IPV6))
- continue;
-#endif
- if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
+ }
+ 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))
+ !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))
+ !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) {
continue;
+ }
if (in6p->in6p_icmp6filt
&& ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
- in6p->in6p_icmp6filt))
+ in6p->in6p_icmp6filt)) {
+ continue;
+ }
+
+ if (inp_restricted_recv(in6p, ifp)) {
continue;
+ }
+
if (last) {
- struct mbuf *n;
+ struct mbuf *n;
if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
- if (last->in6p_flags & IN6P_CONTROLOPTS)
- ip6_savecontrol(last, &opts, ip6, n);
+ if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
+#if CONTENT_FILTER
+ /* Content Filter needs to see local address */
+ (last->in6p_socket->so_cfil_db != NULL) ||
+#endif
+ (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) {
+ ret = ip6_savecontrol(last, n, &opts);
+ if (ret != 0) {
+ m_freem(n);
+ m_freem(opts);
+ last = in6p;
+ continue;
+ }
+ }
/* strip intermediate headers */
m_adj(n, off);
+ so_recv_data_stat(last->in6p_socket, m, 0);
if (sbappendaddr(&last->in6p_socket->so_rcv,
- (struct sockaddr *)&rip6src,
- n, opts, NULL) != 0) {
+ (struct sockaddr *)&rip6src,
+ n, opts, NULL) != 0) {
sorwakeup(last->in6p_socket);
}
opts = NULL;
}
last = in6p;
}
- lck_rw_done(ripcbinfo.mtx);
if (last) {
- if (last->in6p_flags & IN6P_CONTROLOPTS)
- ip6_savecontrol(last, &opts, ip6, m);
+ if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
+#if CONTENT_FILTER
+ /* Content Filter needs to see local address */
+ (last->in6p_socket->so_cfil_db != NULL) ||
+#endif
+ (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) {
+ ret = ip6_savecontrol(last, m, &opts);
+ if (ret != 0) {
+ goto error;
+ }
+ }
/* strip intermediate headers */
m_adj(m, off);
+ so_recv_data_stat(last->in6p_socket, m, 0);
if (sbappendaddr(&last->in6p_socket->so_rcv,
- (struct sockaddr *)&rip6src, m, opts, NULL) != 0) {
+ (struct sockaddr *)&rip6src, m, opts, NULL) != 0) {
sorwakeup(last->in6p_socket);
}
} else {
- m_freem(m);
- ip6stat.ip6s_delivered--;
+ goto error;
}
+ lck_rw_done(ripcbinfo.ipi_lock);
+ return IPPROTO_DONE;
+
+error:
+ lck_rw_done(ripcbinfo.ipi_lock);
+ m_freem(m);
+ m_freem(opts);
+ ip6stat.ip6s_delivered--;
return IPPROTO_DONE;
}
* OFF points to the icmp6 header, counted from the top of the mbuf.
*/
void
-icmp6_reflect(m, off)
- struct mbuf *m;
- size_t off;
+icmp6_reflect(struct mbuf *m, size_t off)
{
+ struct mbuf *m_ip6hdr = m;
struct ip6_hdr *ip6;
struct icmp6_hdr *icmp6;
struct in6_ifaddr *ia;
int type, code;
struct ifnet *outif = NULL;
struct sockaddr_in6 sa6_src, sa6_dst;
-#ifdef COMPAT_RFC1885
- int mtu = IPV6_MMTU;
- struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
-#endif
+ struct nd_ifinfo *ndi = NULL;
u_int32_t oflow;
+ struct ip6_out_args ip6oa;
+
+ bzero(&ip6oa, sizeof(ip6oa));
+ ip6oa.ip6oa_boundif = IFSCOPE_NONE;
+ ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR |
+ IP6OAF_INTCOPROC_ALLOWED | IP6OAF_AWDL_UNRESTRICTED;
+ ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
+ ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
+
+ if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && m->m_pkthdr.rcvif != NULL) {
+ ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index;
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ }
/* too short to reflect */
if (off < sizeof(struct ip6_hdr)) {
- nd6log((LOG_DEBUG,
- "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
+ nd6log(debug,
+ "sanity fail: off=%x, sizeof(ip6)=%x in %s:%d\n",
(u_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr),
- __FILE__, __LINE__));
+ __func__, __LINE__);
goto bad;
}
* If there are extra headers between IPv6 and ICMPv6, strip
* off that header first.
*/
-#if DIAGNOSTIC
- if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
- panic("assumption failed in icmp6_reflect");
-#endif
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);
+ m_adj(m, (int)l);
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
if (m->m_len < l) {
- if ((m = m_pullup(m, l)) == NULL)
+ if ((m_ip6hdr = m_pulldown(m, 0, (int)l, NULL)) == NULL) {
return;
+ }
}
bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
- } else /* off == sizeof(struct ip6_hdr) */ {
+ } else { /* off == sizeof(struct ip6_hdr) */
size_t l;
l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
if (m->m_len < l) {
- if ((m = m_pullup(m, l)) == NULL)
+ if ((m_ip6hdr = m_pulldown(m, 0, (int)l, NULL)) == NULL) {
return;
+ }
}
}
plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
- ip6 = mtod(m, struct ip6_hdr *);
+ ip6 = mtod(m_ip6hdr, struct ip6_hdr *);
ip6->ip6_nxt = IPPROTO_ICMPV6;
icmp6 = (struct icmp6_hdr *)(ip6 + 1);
type = icmp6->icmp6_type; /* keep type for statistics */
* XXX: make sure to embed scope zone information, using
* already embedded IDs or the received interface (if any).
* Note that rcvif may be NULL.
- * TODO: scoped routing case (XXX).
*/
bzero(&sa6_src, sizeof(sa6_src));
sa6_src.sin6_family = AF_INET6;
sa6_src.sin6_len = sizeof(sa6_src);
sa6_src.sin6_addr = ip6->ip6_dst;
in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
- in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
+ in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL, NULL);
bzero(&sa6_dst, sizeof(sa6_dst));
sa6_dst.sin6_family = AF_INET6;
sa6_dst.sin6_len = sizeof(sa6_dst);
sa6_dst.sin6_addr = t;
in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
- in6_embedscope(&t, &sa6_dst, NULL, NULL);
-
-#ifdef COMPAT_RFC1885
- /*
- * xxx guess MTU
- * RFC 1885 requires that echo reply should be truncated if it
- * does not fit in with (return) path MTU, but the description was
- * removed in the new spec.
- */
- if (icmp6_reflect_rt.ro_rt == NULL ||
- !(icmp6_reflect_rt.ro_rt->rt_flags & RTF_UP) ||
- icmp6_reflect_rt.ro_rt->generation_id != route_generation ||
- ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
- if (icmp6_reflect_rt.ro_rt) {
- rtfree(icmp6_reflect_rt.ro_rt);
- 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;
-
- rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
- RTF_PRCLONING);
- }
-
- if (icmp6_reflect_rt.ro_rt == 0)
- goto bad;
+ in6_embedscope(&t, &sa6_dst, NULL, NULL, NULL);
- RT_LOCK(icmp6_reflect_rt.ro_rt);
- 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;
- RT_UNLOCK(icmp6_reflect_rt.ro_rt);
-
- if (mtu < m->m_pkthdr.len) {
- plen -= (m->m_pkthdr.len - mtu);
- m_adj(m, mtu - m->m_pkthdr.len);
- }
-#endif
/*
* If the incoming packet was addressed directly to us(i.e. unicast),
* use dst as the src for the reply.
- * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
+ * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
* (for example) when we encounter an error while forwarding procedure
* destined to a duplicated address of ours.
+ * Note that ip6_getdstifaddr() may fail if we are in an error handling
+ * procedure of an outgoing packet of our own, in which case we need
+ * to search in the ifaddr list.
*/
- lck_mtx_lock(nd6_mutex);
- for (ia = in6_ifaddrs; ia; ia = ia->ia_next)
+ lck_rw_lock_shared(&in6_ifaddr_rwlock);
+ TAILQ_FOREACH(ia, IN6ADDR_HASH(&t), ia6_hash) {
+ IFA_LOCK(&ia->ia_ifa);
if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
- (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
+ (ia->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_CLAT46)) == 0) {
+ IFA_UNLOCK(&ia->ia_ifa);
src = &t;
break;
}
- lck_mtx_unlock(nd6_mutex);
- if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
+ IFA_UNLOCK(&ia->ia_ifa);
+ }
+ lck_rw_done(&in6_ifaddr_rwlock);
+ if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) &&
+ ((m->m_flags & M_LOOP) || (m->m_pkthdr.pkt_flags & PKTF_LOOP))) {
/*
* This is the case if the dst is our link-local address
- * and the sender is also ourselves.
+ * and the sender is also ourselves. Here we test for both
+ * M_LOOP and PKTF_LOOP, since the former may have been set
+ * in ip6_output() and that we get here as part of callling
+ * ip6_process_hopopts(). See comments in <sys/mbuf.h>
*/
src = &t;
}
- if (src == 0) {
+ if (src == NULL) {
int e;
+ struct sockaddr_in6 sin6;
struct route_in6 ro;
/*
* that we do not own. Select a source address based on the
* source address of the erroneous packet.
*/
+ bzero(&sin6, sizeof(sin6));
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_len = sizeof(sin6);
+ sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
+
bzero(&ro, sizeof(ro));
- src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &src_storage, &e);
- if (ro.ro_rt)
- rtfree(ro.ro_rt); /* XXX: we could use this */
+ /*
+ * in6_selectsrc() might return outif with its reference held
+ * even in the error case, so we always need to release it
+ * if non-NULL.
+ */
+ src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif,
+ &src_storage, ip6oa.ip6oa_boundif, &e);
+ ROUTE_RELEASE(&ro);
if (src == NULL) {
- nd6log((LOG_DEBUG,
+ nd6log(debug,
"icmp6_reflect: source can't be determined: "
"dst=%s, error=%d\n",
- ip6_sprintf(&sa6_src.sin6_addr), e));
+ ip6_sprintf(&sa6_src.sin6_addr), e);
goto bad;
}
}
-
- ip6->ip6_src = *src;
-
oflow = ip6->ip6_flow; /* Save for later */
+ ip6->ip6_src = *src;
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_flow |= (oflow & htonl(0x0ff00000));
}
ip6->ip6_nxt = IPPROTO_ICMPV6;
- if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_index < nd_ifinfo_indexlim) {
+ if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL &&
+ ndi->initialized) {
+ lck_mtx_lock(&ndi->lock);
+ ip6->ip6_hlim = ndi->chlim;
+ lck_mtx_unlock(&ndi->lock);
+ }
+ if (m->m_pkthdr.rcvif != NULL &&
+ (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL &&
+ ndi->initialized) {
/* XXX: This may not be the outgoing interface */
- lck_rw_lock_shared(nd_if_rwlock);
- ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim;
- lck_rw_done(nd_if_rwlock);
+ lck_mtx_lock(&ndi->lock);
+ ip6->ip6_hlim = ndi->chlim;
+ lck_mtx_unlock(&ndi->lock);
} else {
- ip6->ip6_hlim = ip6_defhlim;
+ ip6->ip6_hlim = (uint8_t)ip6_defhlim;
}
/* Use the same traffic class as in the request to match IPv4 */
icmp6->icmp6_cksum = 0;
icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
- sizeof(struct ip6_hdr), plen);
+ sizeof(struct ip6_hdr), plen);
/*
* XXX option handling
*/
+ m->m_flags &= ~(M_BCAST | M_MCAST);
- m->m_flags &= ~(M_BCAST|M_MCAST);
-#if IPSEC
- /* Don't lookup socket */
- if (ipsec_bypass == 0)
- (void)ipsec_setsocket(m, NULL);
-#endif /*IPSEC*/
+ if (outif != NULL) {
+ ifnet_release(outif);
+ outif = NULL;
+ }
-#ifdef COMPAT_RFC1885
- ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, 0);
-#else
- ip6_output(m, NULL, NULL, 0, NULL, &outif, 0);
-#endif
- if (outif)
+ m->m_pkthdr.csum_data = 0;
+ m->m_pkthdr.csum_flags = 0;
+ ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
+ if (outif != NULL) {
icmp6_ifoutstat_inc(outif, type, code);
-
+ ifnet_release(outif);
+ }
return;
- bad:
+bad:
m_freem(m);
+ if (outif != NULL) {
+ ifnet_release(outif);
+ }
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;
+icmp6_redirect_diag(struct in6_addr *src6,
+ struct in6_addr *dst6,
+ struct in6_addr *tgt6)
{
static char buf[1024];
snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
- ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
+ ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
return buf;
}
void
-icmp6_redirect_input(m, off)
- struct mbuf *m;
- int off;
+icmp6_redirect_input(struct mbuf *m, int off, int icmp6len)
{
- 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);
+ struct ifnet *ifp = NULL;
+ struct ip6_hdr *ip6 = NULL;
+ struct nd_redirect *nd_rd = NULL;
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)
+ int is_router = 0;
+ int is_onlink = 0;
+ struct in6_addr src6 = {};
+ struct in6_addr redtgt6 = {};
+ struct in6_addr reddst6 = {};
+ union nd_opts ndopts = {};
+
+ if (m == NULL) {
return;
+ }
+
+ ifp = m->m_pkthdr.rcvif;
+ if (ifp == NULL) {
+ goto freeit;
+ }
- /* XXX if we are router, we don't update route by icmp6 redirect */
- if (ip6_forwarding)
+ /*
+ * If we are an advertising router on this interface,
+ * don't update route by icmp6 redirect.
+ */
+ if (ifp->if_ipv6_router_mode == IPV6_ROUTER_MODE_EXCLUSIVE) {
goto freeit;
- if (!icmp6_rediraccept)
+ }
+ if (!icmp6_rediraccept) {
goto freeit;
+ }
+ ip6 = mtod(m, struct ip6_hdr *);
+ src6 = ip6->ip6_src;
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, icmp6len, return);
- nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
+ IP6_EXTHDR_CHECK(m, off, icmp6len, return );
+ nd_rd = (struct nd_redirect *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
if (nd_rd == NULL) {
icmp6stat.icp6s_tooshort++;
- return;
+ goto freeit;
}
#endif
+ ip6 = mtod(m, struct ip6_hdr *);
+
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_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
+ in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
+ goto freeit;
+ }
/* validation */
if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
- nd6log((LOG_ERR,
- "ICMP6 redirect sent from %s rejected; "
- "must be from linklocal\n", ip6_sprintf(&src6)));
+ nd6log(error,
+ "ICMP6 redirect sent from %s rejected; "
+ "must be from linklocal\n", ip6_sprintf(&src6));
goto bad;
}
- if (ip6->ip6_hlim != 255) {
- nd6log((LOG_ERR,
- "ICMP6 redirect sent from %s rejected; "
- "hlim=%d (must be 255)\n",
- ip6_sprintf(&src6), ip6->ip6_hlim));
+ if (ip6->ip6_hlim != IPV6_MAXHLIM) {
+ nd6log(error,
+ "ICMP6 redirect sent from %s rejected; "
+ "hlim=%d (must be 255)\n",
+ ip6_sprintf(&src6), ip6->ip6_hlim);
goto bad;
}
- {
- /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
- 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, 0);
- if (rt) {
- RT_LOCK(rt);
- if (rt->rt_gateway == NULL ||
- rt->rt_gateway->sa_family != AF_INET6) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; no route "
- "with inet6 gateway found for redirect dst: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- RT_UNLOCK(rt);
- rtfree(rt);
- goto bad;
- }
+ {
+ /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
+ 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_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index);
+ if (rt) {
+ RT_LOCK(rt);
+ if (rt->rt_gateway == NULL ||
+ rt->rt_gateway->sa_family != AF_INET6) {
+ nd6log(error,
+ "ICMP6 redirect rejected; no route "
+ "with inet6 gateway found for redirect dst: %s\n",
+ icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ goto bad;
+ }
- gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
- if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
- nd6log((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)));
- RT_UNLOCK(rt);
- rtfree(rt);
+ gw6 = &(((struct sockaddr_in6 *)(void *)
+ rt->rt_gateway)->sin6_addr);
+ if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
+ nd6log(error,
+ "ICMP6 redirect rejected; "
+ "not equal to gw-for-src=%s (must be same): "
+ "%s\n",
+ ip6_sprintf(gw6),
+ icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ goto bad;
+ }
+ } else {
+ nd6log(error,
+ "ICMP6 redirect rejected; "
+ "no route found for redirect dst: %s\n",
+ icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
goto bad;
}
- } else {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "no route found for redirect dst: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- goto bad;
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ rt = NULL;
}
- RT_UNLOCK(rt);
- rtfree(rt);
- rt = NULL;
- }
if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "redirect dst must be unicast: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
+ nd6log(error,
+ "ICMP6 redirect rejected; "
+ "redirect dst must be unicast: %s\n",
+ icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
goto bad;
}
is_router = is_onlink = 0;
- if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
- is_router = 1; /* router case */
- if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
- is_onlink = 1; /* on-link destination case */
+ if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) {
+ is_router = 1; /* router case */
+ }
+ if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) {
+ is_onlink = 1; /* on-link destination case */
+ }
if (!is_router && !is_onlink) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "neither router case nor onlink case: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
+ nd6log(error,
+ "ICMP6 redirect rejected; "
+ "neither router case nor onlink case: %s\n",
+ icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
goto bad;
}
/* validation passed */
icmp6len -= sizeof(*nd_rd);
nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
- nd6log((LOG_INFO, "icmp6_redirect_input: "
- "invalid ND option, rejected: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
+ nd6log(info, "icmp6_redirect_input: "
+ "invalid ND option, rejected: %s\n",
+ icmp6_redirect_diag(&src6, &reddst6, &redtgt6));
/* nd6_options have incremented stats */
goto freeit;
}
}
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
- nd6log((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)));
+ nd6log(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));
goto bad;
}
/* RFC 2461 8.3 */
nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
- is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
+ is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
- if (!is_onlink) { /* better router case. perform rtredirect. */
+ if (!is_onlink) { /* better router case. perform rtredirect. */
/* perform rtredirect */
struct sockaddr_in6 sdst;
struct sockaddr_in6 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);
+ 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));
(struct sockaddr *)&ssrc, NULL);
}
/* finally update cached route in each socket via pfctlinput */
- {
- struct sockaddr_in6 sdst;
-
- 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));
-
- /*
- * Radar 6843900
- * Release the IPv6 domain lock because we are going to take domain_proto_mtx
- * and could otherwise cause a deadlock with other threads taking these locks
- * in the reverse order -- e.g. frag6_slowtimo() from pfslowtimo()
- */
- lck_mtx_unlock(inet6_domain_mutex);
- pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
- lck_mtx_lock(inet6_domain_mutex);
+ {
+ struct sockaddr_in6 sdst;
+
+ 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));
+
+ pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
#if IPSEC
- key_sa_routechange((struct sockaddr *)&sdst);
+ key_sa_routechange((struct sockaddr *)&sdst);
#endif
- }
+ }
- freeit:
+freeit:
m_freem(m);
return;
- bad:
+bad:
icmp6stat.icp6s_badredirect++;
m_freem(m);
}
void
-icmp6_redirect_output(m0, rt)
- struct mbuf *m0;
- struct rtentry *rt;
+icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
{
- struct ifnet *ifp; /* my outgoing interface */
+ struct ifnet *ifp; /* my outgoing interface */
struct in6_addr ifp_ll6;
struct in6_addr *router_ll6;
- struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
- struct mbuf *m = NULL; /* newly allocated one */
- struct ip6_hdr *ip6; /* m as struct ip6_hdr */
+ struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
+ struct mbuf *m = NULL; /* newly allocated one */
+ struct ip6_hdr *ip6; /* m as struct ip6_hdr */
struct nd_redirect *nd_rd;
size_t maxlen;
u_char *p;
struct ifnet *outif = NULL;
struct sockaddr_in6 src_sa;
+ struct ip6_out_args ip6oa;
+
+ bzero(&ip6oa, sizeof(ip6oa));
+ ip6oa.ip6oa_boundif = IFSCOPE_NONE;
+ ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR;
+ ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
+ ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
- if (rt != NULL)
+ if (rt != NULL) {
RT_LOCK(rt);
+ }
/* sanity check */
- if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
+ if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) {
goto fail;
+ }
- /* if we are not router, we don't send icmp6 redirect */
- if (!ip6_forwarding || ip6_accept_rtadv || (ifp->if_eflags & IFEF_ACCEPT_RTADVD))
+ /*
+ * If we are not a router to begin with, or not an advertising
+ * router on this interface, don't send icmp6 redirect.
+ */
+ if (!ip6_forwarding || ifp->if_ipv6_router_mode != IPV6_ROUTER_MODE_EXCLUSIVE) {
goto fail;
+ }
/*
* Address check:
goto fail;
}
RT_LOCK(rt);
- if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
- goto fail; /* what should we do here? */
-
+ if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) {
+ goto fail; /* what should we do here? */
+ }
/* rate limit */
- if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
+ if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) {
goto fail;
+ }
/*
* Since we are going to append up to 1280 bytes (= IPV6_MMTU),
#if IPV6_MMTU >= MCLBYTES
# error assumption failed about IPV6_MMTU and MCLBYTES
#endif
- MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
- if (m && IPV6_MMTU >= MHLEN)
+ MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+ if (m && IPV6_MMTU >= MHLEN) {
MCLGET(m, M_DONTWAIT);
- if (!m)
+ }
+ if (!m) {
goto fail;
+ }
m->m_pkthdr.rcvif = NULL;
m->m_len = 0;
maxlen = M_TRAILINGSPACE(m);
- maxlen = min(IPV6_MMTU, maxlen);
+ maxlen = MIN(IPV6_MMTU, maxlen);
/* just for safety */
if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
/* get ip6 linklocal address for ifp(my outgoing interface). */
struct in6_ifaddr *ia;
if ((ia = in6ifa_ifpforlinklocal(ifp,
- IN6_IFF_NOTREADY|
- IN6_IFF_ANYCAST)) == NULL)
+ IN6_IFF_NOTREADY |
+ IN6_IFF_ANYCAST)) == NULL) {
goto fail;
+ }
+ IFA_LOCK(&ia->ia_ifa);
ifp_ll6 = ia->ia_addr.sin6_addr;
- ifafree(&ia->ia_ifa);
+ IFA_UNLOCK(&ia->ia_ifa);
+ IFA_REMREF(&ia->ia_ifa);
}
/* get ip6 linklocal address for the router. */
if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
struct sockaddr_in6 *sin6;
- sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
+ sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway;
router_ll6 = &sin6->sin6_addr;
- if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
+ if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) {
router_ll6 = (struct in6_addr *)NULL;
- } else
+ }
+ } else {
router_ll6 = (struct in6_addr *)NULL;
+ }
/* ip6 */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_vfc |= IPV6_VERSION;
/* ip6->ip6_plen will be set later */
ip6->ip6_nxt = IPPROTO_ICMPV6;
- ip6->ip6_hlim = 255;
+ ip6->ip6_hlim = IPV6_MAXHLIM;
/* ip6->ip6_src must be linklocal addr for my outgoing if. */
bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
* nd_rd->nd_rd_target must be a link-local address in
* better router cases.
*/
- if (!router_ll6)
+ if (!router_ll6) {
goto fail;
+ }
bcopy(router_ll6, &nd_rd->nd_rd_target,
- sizeof(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));
+ sizeof(nd_rd->nd_rd_dst));
} else {
/* make sure redtgt == reddst */
bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
- sizeof(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));
+ sizeof(nd_rd->nd_rd_dst));
}
RT_UNLOCK(rt);
rt = NULL;
p = (u_char *)(nd_rd + 1);
- if (!router_ll6)
+ if (!router_ll6) {
goto nolladdropt;
+ }
- {
- /* target lladdr option */
- struct rtentry *rt_router = NULL;
- int len;
- struct sockaddr_dl *sdl;
- struct nd_opt_hdr *nd_opt;
- char *lladdr;
-
- /* Callee returns a locked route upon success */
- rt_router = nd6_lookup(router_ll6, 0, ifp, 0);
- if (!rt_router)
- goto nolladdropt;
- RT_LOCK_ASSERT_HELD(rt_router);
- len = sizeof(*nd_opt) + ifp->if_addrlen;
- len = (len + 7) & ~7; /* round by 8 */
- /* safety check */
- if (len + (p - (u_char *)ip6) > maxlen) {
+ {
+ /* target lladdr option */
+ struct rtentry *rt_router = NULL;
+ int len;
+ struct sockaddr_dl *sdl;
+ struct nd_opt_hdr *nd_opt;
+ char *lladdr;
+
+ /* Callee returns a locked route upon success */
+ rt_router = nd6_lookup(router_ll6, 0, ifp, 0);
+ if (!rt_router) {
+ goto nolladdropt;
+ }
+ RT_LOCK_ASSERT_HELD(rt_router);
+ len = sizeof(*nd_opt) + ifp->if_addrlen;
+ len = (len + 7) & ~7; /* round by 8 */
+ /* safety check */
+ if (len + (p - (u_char *)ip6) > maxlen) {
+ RT_REMREF_LOCKED(rt_router);
+ RT_UNLOCK(rt_router);
+ 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 *)(void *)
+ 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 = (uint8_t)(len >> 3);
+ lladdr = (char *)(nd_opt + 1);
+ bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
+ p += len;
+ }
RT_REMREF_LOCKED(rt_router);
RT_UNLOCK(rt_router);
- 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;
- }
- RT_REMREF_LOCKED(rt_router);
- RT_UNLOCK(rt_router);
- }
+
nolladdropt:;
- m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
+ m->m_pkthdr.len = m->m_len = (int32_t)(p - (u_char *)ip6);
/* just to be safe */
-#ifdef M_DECRYPTED /*not openbsd*/
- if (m0->m_flags & M_DECRYPTED)
+#ifdef M_DECRYPTED /*not openbsd*/
+ if (m0->m_flags & M_DECRYPTED) {
goto noredhdropt;
+ }
#endif
- if (p - (u_char *)ip6 > maxlen)
+ if (p - (u_char *)ip6 > maxlen) {
goto noredhdropt;
+ }
- {
- /* redirected header option */
- int len;
- struct nd_opt_rd_hdr *nd_opt_rh;
-
- /*
- * compute the maximum size for icmp6 redirect header option.
- * XXX room for auth header?
- */
- len = maxlen - (p - (u_char *)ip6);
- len &= ~7;
+ {
+ /* redirected header option */
+ int len;
+ struct nd_opt_rd_hdr *nd_opt_rh;
- /* This is just for simplicity. */
- if (m0->m_pkthdr.len != m0->m_len) {
- if (m0->m_next) {
- m_freem(m0->m_next);
- m0->m_next = NULL;
+ /*
+ * compute the maximum size for icmp6 redirect header option.
+ * XXX room for auth header?
+ */
+ len = (int)(maxlen - (p - (u_char *)ip6));
+ len &= ~7;
+
+ /* This is just for simplicity. */
+ 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;
}
- m0->m_pkthdr.len = m0->m_len;
- }
- /*
- * Redirected header option spec (RFC2461 4.6.3) talks nothing
- * about padding/truncate rule for the original IP packet.
- * From the discussion on IPv6imp in Feb 1999, the consensus was:
- * - "attach as much as possible" is the goal
- * - pad if not aligned (original size can be guessed by original
- * ip6 header)
- * Following code adds the padding if it is simple enough,
- * and truncates if not.
- */
- if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
- panic("assumption failed in %s:%d\n", __FILE__, __LINE__);
+ /*
+ * Redirected header option spec (RFC2461 4.6.3) talks nothing
+ * about padding/truncate rule for the original IP packet.
+ * From the discussion on IPv6imp in Feb 1999, the consensus was:
+ * - "attach as much as possible" is the goal
+ * - pad if not aligned (original size can be guessed by original
+ * ip6 header)
+ * Following code adds the padding if it is simple enough,
+ * and truncates if not.
+ */
+ if (m0->m_next || m0->m_pkthdr.len != m0->m_len) {
+ panic("assumption failed in %s:%d\n", __func__, __LINE__);
+ }
- if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
- /* not enough room, truncate */
- m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
- } else {
- /* enough room, pad or truncate */
- size_t extra;
-
- extra = m0->m_pkthdr.len % 8;
- if (extra) {
- /* pad if easy enough, truncate if not */
- if (8 - extra <= M_TRAILINGSPACE(m0)) {
- /* pad */
- m0->m_len += (8 - extra);
- m0->m_pkthdr.len += (8 - extra);
- } else {
- /* truncate */
- m0->m_pkthdr.len -= extra;
- m0->m_len -= extra;
+ if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
+ /* not enough room, truncate */
+ m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
+ } else {
+ /* enough room, pad or truncate */
+ size_t extra;
+
+ extra = m0->m_pkthdr.len % 8;
+ if (extra) {
+ /* pad if easy enough, truncate if not */
+ if (8 - extra <= M_TRAILINGSPACE(m0)) {
+ /* pad */
+ m0->m_len += (8 - extra);
+ m0->m_pkthdr.len += (8 - extra);
+ } else {
+ /* truncate */
+ 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);
}
- 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;
+ 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 = (uint8_t)(len >> 3);
+ p += sizeof(*nd_opt_rh);
+ m->m_pkthdr.len = m->m_len = (int32_t)(p - (u_char *)ip6);
- /* connect m0 to m */
- m->m_next = m0;
- m->m_pkthdr.len = m->m_len + m0->m_len;
- }
+ /* connect m0 to m */
+ 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;
+ /* XXX: clear embedded link IDs in the inner header */
+ in6_clearscope(&sip6->ip6_src);
+ in6_clearscope(&sip6->ip6_dst);
+ in6_clearscope(&nd_rd->nd_rd_target);
+ in6_clearscope(&nd_rd->nd_rd_dst);
- ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
+ ip6->ip6_plen = htons((uint16_t)(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));
+ = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
/* send the packet to outside... */
-#if IPSEC
- /* Don't lookup socket */
- if (ipsec_bypass == 0)
- (void)ipsec_setsocket(m, NULL);
-#endif /*IPSEC*/
- ip6_output(m, NULL, NULL, 0, NULL, &outif, 0);
+ ip6oa.ip6oa_boundif = ifp->if_index;
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ ip6oa.ip6oa_flags |= IP6OAF_DONT_FRAG;
+
+ ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa);
if (outif) {
icmp6_ifstat_inc(outif, ifs6_out_msg);
icmp6_ifstat_inc(outif, ifs6_out_redirect);
+ ifnet_release(outif);
}
icmp6stat.icp6s_outhist[ND_REDIRECT]++;
return;
fail:
- if (rt != NULL)
+ if (rt != NULL) {
RT_UNLOCK(rt);
- if (m)
+ }
+ if (m) {
m_freem(m);
- if (m0)
+ }
+ if (m0) {
m_freem(m0);
+ }
}
-#if HAVE_NRL_INPCB
-#define sotoin6pcb sotoinpcb
-#define in6pcb inpcb
-#define in6p_icmp6filt inp_icmp6filt
-#endif
/*
* ICMPv6 socket option processing.
*/
int
-icmp6_ctloutput(so, sopt)
- struct socket *so;
- struct sockopt *sopt;
+icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
{
int error = 0;
- int optlen;
+ size_t optlen;
struct inpcb *inp = sotoinpcb(so);
int level, op, optname;
op = sopt->sopt_dir;
optname = sopt->sopt_name;
optlen = sopt->sopt_valsize;
- } else
+ } else {
level = op = optname = optlen = 0;
+ }
if (level != IPPROTO_ICMPV6) {
return EINVAL;
case PRCO_SETOPT:
switch (optname) {
case ICMP6_FILTER:
- {
+ {
struct icmp6_filter *p;
- if (optlen != sizeof(*p)) {
+ if (optlen != 0 && optlen != sizeof(*p)) {
error = EMSGSIZE;
break;
}
error = EINVAL;
break;
}
- error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
- optlen);
+
+ if (optlen == 0) {
+ /* According to RFC 3542, an installed filter can be
+ * cleared by issuing a setsockopt for ICMP6_FILTER
+ * with a zero length.
+ */
+ ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
+ } else {
+ error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
+ optlen);
+ }
break;
- }
+ }
default:
error = ENOPROTOOPT;
case PRCO_GETOPT:
switch (optname) {
case ICMP6_FILTER:
- {
+ {
if (inp->in6p_icmp6filt == NULL) {
error = EINVAL;
break;
}
error = sooptcopyout(sopt, inp->in6p_icmp6filt,
- sizeof(struct icmp6_filter));
+ MIN(sizeof(struct icmp6_filter), optlen));
break;
- }
+ }
default:
error = ENOPROTOOPT;
break;
}
- return(error);
+ return error;
}
-#if HAVE_NRL_INPCB
-#undef sotoin6pcb
-#undef in6pcb
-#undef in6p_icmp6filt
-#endif
/*
* ICMPv6 socket datagram option processing.
int
icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt)
{
- if (so->so_uid == 0)
+ if (kauth_cred_issuser(so->so_cred)) {
return icmp6_ctloutput(so, sopt);
+ }
if (sopt->sopt_level == IPPROTO_ICMPV6) {
switch (sopt->sopt_name) {
- case ICMP6_FILTER:
- return icmp6_ctloutput(so, sopt);
- default:
- return EPERM;
+ case ICMP6_FILTER:
+ return icmp6_ctloutput(so, sopt);
+ default:
+ return EPERM;
}
}
-
- if (sopt->sopt_level != IPPROTO_IPV6)
+
+ if (sopt->sopt_level != IPPROTO_IPV6) {
return EINVAL;
-
+ }
+
switch (sopt->sopt_name) {
- case IPV6_PKTOPTIONS:
- case IPV6_UNICAST_HOPS:
- case IPV6_CHECKSUM:
- case IPV6_FAITH:
- case IPV6_V6ONLY:
- case IPV6_PKTINFO:
- case IPV6_HOPLIMIT:
- case IPV6_HOPOPTS:
- case IPV6_DSTOPTS:
- case IPV6_RTHDR:
- case IPV6_MULTICAST_IF:
- case IPV6_MULTICAST_HOPS:
- case IPV6_MULTICAST_LOOP:
- case IPV6_JOIN_GROUP:
- case IPV6_LEAVE_GROUP:
- case IPV6_PORTRANGE:
- case IPV6_IPSEC_POLICY:
- case IPV6_RECVTCLASS:
- case IPV6_TCLASS:
- return ip6_ctloutput(so, sopt);
-
- default:
- return EPERM;
-
-
+ case IPV6_UNICAST_HOPS:
+ case IPV6_CHECKSUM:
+ case IPV6_V6ONLY:
+ case IPV6_USE_MIN_MTU:
+ case IPV6_RECVRTHDR:
+ case IPV6_RECVPKTINFO:
+ case IPV6_RECVHOPLIMIT:
+ case IPV6_PATHMTU:
+ case IPV6_PKTINFO:
+ case IPV6_HOPLIMIT:
+ case IPV6_HOPOPTS:
+ case IPV6_DSTOPTS:
+ case IPV6_MULTICAST_IF:
+ case IPV6_MULTICAST_HOPS:
+ case IPV6_MULTICAST_LOOP:
+ case IPV6_JOIN_GROUP:
+ case IPV6_LEAVE_GROUP:
+ case IPV6_PORTRANGE:
+ case IPV6_IPSEC_POLICY:
+ case IPV6_RECVTCLASS:
+ case IPV6_TCLASS:
+ case IPV6_2292PKTOPTIONS:
+ case IPV6_2292PKTINFO:
+ case IPV6_2292HOPLIMIT:
+ case IPV6_2292HOPOPTS:
+ case IPV6_2292DSTOPTS:
+ case IPV6_2292RTHDR:
+ case IPV6_BOUND_IF:
+ case IPV6_NO_IFT_CELLULAR:
+
+ return ip6_ctloutput(so, sopt);
+
+ default:
+ return EPERM;
}
}
__private_extern__ int
-icmp6_dgram_send(struct socket *so, __unused int flags, struct mbuf *m, struct sockaddr *nam,
- struct mbuf *control, __unused struct proc *p)
+icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m,
+ struct sockaddr *nam, struct mbuf *control, struct proc *p)
{
+#pragma unused(flags, p)
int error = 0;
struct inpcb *inp = sotoinpcb(so);
- struct sockaddr_in6 tmp;
- struct sockaddr_in6 *dst;
struct icmp6_hdr *icmp6;
- if (so->so_uid == 0)
- return rip6_output(m, so, (struct sockaddr_in6 *) nam, control);
-
- /* always copy sockaddr to avoid overwrites */
- if (so->so_state & SS_ISCONNECTED) {
- if (nam) {
- m_freem(m);
- return EISCONN;
- }
- /* XXX */
- bzero(&tmp, sizeof(tmp));
- tmp.sin6_family = AF_INET6;
- tmp.sin6_len = sizeof(struct sockaddr_in6);
- bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
- sizeof(struct in6_addr));
- dst = &tmp;
- } else {
- if (nam == NULL) {
- m_freem(m);
- return ENOTCONN;
- }
- tmp = *(struct sockaddr_in6 *)nam;
- dst = &tmp;
+ if (inp == NULL
+#if NECP
+ || (necp_socket_should_use_flow_divert(inp))
+#endif /* NECP */
+ ) {
+ error = (inp == NULL ? EINVAL : EPROTOTYPE);
+ goto bad;
+ }
+
+ if (kauth_cred_issuser(so->so_cred)) {
+ return rip6_output(m, so, SIN6(nam), control, 0);
}
/*
* For an ICMPv6 packet, we should know its type and code
*/
- if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
+ if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
if (m->m_len < sizeof(struct icmp6_hdr) &&
- (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
- error = ENOBUFS;
- goto bad;
+ (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
+ error = ENOBUFS;
+ goto bad;
}
icmp6 = mtod(m, struct icmp6_hdr *);
-
+
/*
* Allow only to send echo request and node information request
* See RFC 2463 for Echo Request Message format
*/
- if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST && icmp6->icmp6_code == 0) ||
- (icmp6->icmp6_type == ICMP6_NI_QUERY &&
- (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 ||
- icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) {
+ if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST &&
+ icmp6->icmp6_code == 0) ||
+ (icmp6->icmp6_type == ICMP6_NI_QUERY &&
+ (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 ||
+ icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) {
/* Good */
;
} else {
}
}
-#if ENABLE_DEFAULT_SCOPE
- if (dst->sin6_scope_id == 0) { /* not change if specified */
- dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr);
+ return rip6_output(m, so, SIN6(nam), control, 0);
+bad:
+ VERIFY(error != 0);
+
+ if (m != NULL) {
+ m_freem(m);
+ }
+ if (control != NULL) {
+ m_freem(control);
}
-#endif
- return rip6_output(m, so, (struct sockaddr_in6 *) nam, control);
-bad:
- m_freem(m);
return error;
}
__private_extern__ int
icmp6_dgram_attach(struct socket *so, int proto, struct proc *p)
{
- struct inpcb *inp;
- int error;
-
- inp = sotoinpcb(so);
- if (inp)
- panic("icmp6_dgram_attach");
-
- if (proto != IPPROTO_ICMPV6)
- return EINVAL;
-
- error = soreserve(so, rip_sendspace, rip_recvspace);
- if (error)
- return error;
- error = in_pcballoc(so, &ripcbinfo, p);
- if (error)
- return error;
- inp = (struct inpcb *)so->so_pcb;
- inp->inp_vflag |= INP_IPV6;
- inp->in6p_ip6_nxt = IPPROTO_ICMPV6;
- inp->in6p_hops = -1; /* use kernel default */
- inp->in6p_cksum = -1;
- MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
- sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
- if (inp->in6p_icmp6filt == NULL)
- return (ENOMEM);
- ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
- return 0;
-}
-
-
-
-#ifndef HAVE_PPSRATECHECK
-#ifndef timersub
-#define timersub(tvp, uvp, vvp) \
- do { \
- (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
- (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
- if ((vvp)->tv_usec < 0) { \
- (vvp)->tv_sec--; \
- (vvp)->tv_usec += 1000000; \
- } \
- } while (0)
-#endif
-
-/*
- * ppsratecheck(): packets (or events) per second limitation.
- */
-static int
-ppsratecheck(lasttime, curpps, maxpps)
- struct timeval *lasttime;
- int *curpps;
- int maxpps; /* maximum pps allowed */
-{
- struct timeval tv, delta;
- int rv;
-
- microtime(&tv);
+ struct inpcb *inp;
+ int error;
- timersub(&tv, lasttime, &delta);
+ inp = sotoinpcb(so);
+ if (inp) {
+ panic("icmp6_dgram_attach");
+ }
- /*
- * Check for 0,0 so that the message will be seen at least once.
- * If more than one second has passed since the last update of
- * lasttime, reset the counter.
- *
- * we do increment *curpps even in *curpps < maxpps case, as some may
- * try to use *curpps for stat purposes as well.
- */
- if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
- delta.tv_sec >= 1) {
- *lasttime = tv;
- *curpps = 0;
- rv = 1;
- } else if (maxpps < 0)
- rv = 1;
- else if (*curpps < maxpps)
- rv = 1;
- else
- rv = 0;
-
-#if 1 /* DIAGNOSTIC? */
- /* be careful about wrap-around */
- if (*curpps + 1 > 0)
- *curpps = *curpps + 1;
-#else
- /*
- * assume that there's not too many calls to this function.
- * not sure if the assumption holds, as it depends on *caller's*
- * behavior, not the behavior of this function.
- * IMHO it is wrong to make assumption on the caller's behavior,
- * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
- */
- *curpps = *curpps + 1;
-#endif
+ if (proto != IPPROTO_ICMPV6) {
+ return EINVAL;
+ }
- return (rv);
+ error = soreserve(so, rip_sendspace, rip_recvspace);
+ if (error) {
+ return error;
+ }
+ error = in_pcballoc(so, &ripcbinfo, p);
+ if (error) {
+ return error;
+ }
+ inp = (struct inpcb *)so->so_pcb;
+ inp->inp_vflag |= INP_IPV6;
+ inp->in6p_ip6_nxt = IPPROTO_ICMPV6;
+ inp->in6p_hops = -1; /* use kernel default */
+ inp->in6p_cksum = -1;
+ MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
+ sizeof(struct icmp6_filter), M_PCB, M_WAITOK);
+ if (inp->in6p_icmp6filt == NULL) {
+ return ENOMEM;
+ }
+ ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
+ return 0;
}
-#endif
+
/*
* Perform rate limit check.
* Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
* limitation.
*
- * XXX per-destination/type check necessary?
+ * XXX per-destination check necessary?
*/
static int
icmp6_ratelimit(
- __unused const struct in6_addr *dst, /* not used at this moment */
- __unused const int type, /* not used at this moment */
- __unused const int code) /* not used at this moment */
+ __unused const struct in6_addr *dst, /* not used at this moment */
+ const int type,
+ __unused const int code)
{
int ret;
- ret = 0; /* okay to send */
+ ret = 0; /* okay to send */
/* PPS limit */
- if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
+ if (type == ND_ROUTER_ADVERT) {
+ if (!ppsratecheck(&icmp6rappslim_last, &icmp6rapps_count,
+ icmp6rappslim)) {
+ ret++;
+ }
+ } else if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
icmp6errppslim)) {
- /* The packet is subject to rate limit */
- ret++;
+ /*
+ * We add some randomness here to still generate ICMPv6 error
+ * post icmp6errppslim limit with a probability that goes down
+ * with increased value of icmp6errpps_count.
+ */
+ if (icmp6errpps_count > 0 && icmp6errppslim > 0 &&
+ icmp6errpps_count > icmp6errppslim &&
+ (random() % (icmp6errpps_count - icmp6errppslim)) != 0) {
+ /* The packet is subject to rate limit */
+ ret++;
+ }
}
return ret;
}
-
projects / apple / xnu.git / blobdiff