/*
- * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2018 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@
*/
-/* $FreeBSD: src/sys/netinet6/in6_src.c,v 1.1.2.2 2001/07/03 11:01:52 ume Exp $ */
-/* $KAME: in6_src.c,v 1.37 2001/03/29 05:34:31 itojun Exp $ */
-
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
#include <sys/sysctl.h>
#include <sys/kauth.h>
#include <sys/priv.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
#include <net/if.h>
#include <net/if_types.h>
CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_srcif_debug, 0,
"log source interface selection debug info");
+static int ip6_select_srcaddr_debug = 0;
+SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_srcaddr_debug,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_srcaddr_debug, 0,
+ "log source address selection debug info");
+
+static int ip6_select_src_expensive_secondary_if = 0;
+SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_src_expensive_secondary_if,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_src_expensive_secondary_if, 0,
+ "allow source interface selection to use expensive secondaries");
+
+static int ip6_select_src_strong_end = 1;
+SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_src_strong_end,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_src_strong_end, 0,
+ "limit source address selection to outgoing interface");
+
#define ADDR_LABEL_NOTAPP (-1)
struct in6_addrpolicy defaultaddrpolicy;
int ip6_prefer_tempaddr = 1;
#ifdef ENABLE_ADDRSEL
extern lck_mtx_t *addrsel_mutex;
-#define ADDRSEL_LOCK() lck_mtx_lock(addrsel_mutex)
-#define ADDRSEL_UNLOCK() lck_mtx_unlock(addrsel_mutex)
+#define ADDRSEL_LOCK() lck_mtx_lock(addrsel_mutex)
+#define ADDRSEL_UNLOCK() lck_mtx_unlock(addrsel_mutex)
#else
-#define ADDRSEL_LOCK()
-#define ADDRSEL_UNLOCK()
+#define ADDRSEL_LOCK()
+#define ADDRSEL_UNLOCK()
#endif
static int selectroute(struct sockaddr_in6 *, struct sockaddr_in6 *,
- struct ip6_pktopts *, struct ip6_moptions *, struct route_in6 *,
- struct ifnet **, struct rtentry **, int, int, unsigned int,
- unsigned int);
+ struct ip6_pktopts *, struct ip6_moptions *, struct in6_ifaddr **,
+ struct route_in6 *, struct ifnet **, struct rtentry **, int, int,
+ struct ip6_out_args *ip6oa);
static int in6_selectif(struct sockaddr_in6 *, struct ip6_pktopts *,
- struct ip6_moptions *, struct route_in6 *ro, unsigned int,
- unsigned int, struct ifnet **);
+ struct ip6_moptions *, struct route_in6 *ro,
+ struct ip6_out_args *, struct ifnet **);
static void init_policy_queue(void);
static int add_addrsel_policyent(const struct in6_addrpolicy *);
#ifdef ENABLE_ADDRSEL
static int delete_addrsel_policyent(const struct in6_addrpolicy *);
#endif
static int walk_addrsel_policy(int (*)(const struct in6_addrpolicy *, void *),
- void *);
+ void *);
static int dump_addrsel_policyent(const struct in6_addrpolicy *, void *);
static struct in6_addrpolicy *match_addrsel_policy(struct sockaddr_in6 *);
void addrsel_policy_init(void);
+#define SASEL_DO_DBG(inp) \
+ (ip6_select_srcaddr_debug && (inp) != NULL && \
+ (inp)->inp_socket != NULL && \
+ ((inp)->inp_socket->so_options & SO_DEBUG))
+
+#define SASEL_LOG(fmt, ...) \
+do { \
+ if (srcsel_debug) \
+ printf("%s:%d " fmt "\n",\
+ __FUNCTION__, __LINE__, ##__VA_ARGS__); \
+} while (0); \
+
/*
* Return an IPv6 address, which is the most appropriate for a given
* destination and user specified options.
* an entry to the caller for later use.
*/
#define REPLACE(r) do {\
- if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
- sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
- ip6stat.ip6s_sources_rule[(r)]++; \
+ SASEL_LOG("REPLACE r %d ia %s ifp1 %s\n", \
+ (r), s_src, ifp1->if_xname); \
+ srcrule = (r); \
goto replace; \
-} while(0)
+} while (0)
+
#define NEXTSRC(r) do {\
- if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
- sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
- ip6stat.ip6s_sources_rule[(r)]++; \
- goto next; /* XXX: we can't use 'continue' here */ \
-} while(0)
+ SASEL_LOG("NEXTSRC r %d ia %s ifp1 %s\n", \
+ (r), s_src, ifp1->if_xname); \
+ goto next; /* XXX: we can't use 'continue' here */ \
+} while (0)
+
#define BREAK(r) do { \
- if ((r) < sizeof(ip6stat.ip6s_sources_rule) / \
- sizeof(ip6stat.ip6s_sources_rule[0])) /* check for safety */ \
- ip6stat.ip6s_sources_rule[(r)]++; \
- goto out; /* XXX: we can't use 'break' here */ \
-} while(0)
+ SASEL_LOG("BREAK r %d ia %s ifp1 %s\n", \
+ (r), s_src, ifp1->if_xname); \
+ srcrule = (r); \
+ goto out; /* XXX: we can't use 'break' here */ \
+} while (0)
-struct in6_addr *
-in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
- struct inpcb *inp, struct route_in6 *ro,
- struct ifnet **ifpp, struct in6_addr *src_storage, unsigned int ifscope,
- int *errorp)
+
+struct ifaddr *
+in6_selectsrc_core_ifa(struct sockaddr_in6 *addr, struct ifnet *ifp, int srcsel_debug)
{
- struct in6_addr dst;
- struct ifnet *ifp = NULL;
- struct in6_ifaddr *ia = NULL, *ia_best = NULL;
- struct in6_pktinfo *pi = NULL;
- int dst_scope = -1, best_scope = -1, best_matchlen = -1;
- struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
- u_int32_t odstzone;
- int prefer_tempaddr;
- struct ip6_moptions *mopts;
- struct timeval timenow;
- unsigned int nocell;
- boolean_t islocal = FALSE;
+ int err = 0;
+ struct ifnet *src_ifp = NULL;
+ struct in6_addr src_storage = {};
+ struct in6_addr *in6 = NULL;
+ struct ifaddr *ifa = NULL;
- getmicrotime(&timenow);
+ if ((in6 = in6_selectsrc_core(addr,
+ (ip6_prefer_tempaddr ? IPV6_SRCSEL_HINT_PREFER_TMPADDR : 0),
+ ifp, 0, &src_storage, &src_ifp, &err, &ifa)) == NULL) {
+ if (err == 0) {
+ err = EADDRNOTAVAIL;
+ }
+ VERIFY(src_ifp == NULL);
+ if (ifa != NULL) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ }
+ goto done;
+ }
- dst = dstsock->sin6_addr; /* make a copy for local operation */
- *errorp = 0;
- if (ifpp != NULL)
- *ifpp = NULL;
+ if (src_ifp != ifp) {
+ if (err == 0) {
+ err = ENETUNREACH;
+ }
+ if (ifa != NULL) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ }
+ goto done;
+ }
- if (inp != NULL) {
- mopts = inp->in6p_moptions;
- nocell = (inp->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;
- } else {
- mopts = NULL;
- nocell = 0;
+ VERIFY(ifa != NULL);
+ ifnet_lock_shared(ifp);
+ if ((ifa->ifa_debug & IFD_DETACHING) != 0) {
+ err = EHOSTUNREACH;
+ ifnet_lock_done(ifp);
+ if (ifa != NULL) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ }
+ goto done;
}
+ ifnet_lock_done(ifp);
- /*
- * If the source address is explicitly specified by the caller,
- * check if the requested source address is indeed a unicast address
- * assigned to the node, and can be used as the packet's source
- * address. If everything is okay, use the address as source.
- */
- if (opts && (pi = opts->ip6po_pktinfo) &&
- !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
- struct sockaddr_in6 srcsock;
- struct in6_ifaddr *ia6;
+done:
+ SASEL_LOG("Returned with error: %d", err);
+ if (src_ifp != NULL) {
+ ifnet_release(src_ifp);
+ }
+ return ifa;
+}
- /* get the outgoing interface */
- if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, ifscope,
- nocell, &ifp)) != 0) {
- return (NULL);
- }
+struct in6_addr *
+in6_selectsrc_core(struct sockaddr_in6 *dstsock, uint32_t hint_mask,
+ struct ifnet *ifp, int srcsel_debug, struct in6_addr *src_storage,
+ struct ifnet **sifp, int *errorp, struct ifaddr **ifapp)
+{
+ u_int32_t odstzone;
+ int bestrule = IP6S_SRCRULE_0;
+ struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
+ struct in6_addr dst;
+ struct in6_ifaddr *ia = NULL, *ia_best = NULL;
+ char s_src[MAX_IPv6_STR_LEN] = {0};
+ char s_dst[MAX_IPv6_STR_LEN] = {0};
+ const struct in6_addr *tmp = NULL;
+ int dst_scope = -1, best_scope = -1, best_matchlen = -1;
+ uint64_t secs = net_uptime();
+ VERIFY(dstsock != NULL);
+ VERIFY(src_storage != NULL);
+ VERIFY(ifp != NULL);
- /*
- * determine the appropriate zone id of the source based on
- * the zone of the destination and the outgoing interface.
- * If the specified address is ambiguous wrt the scope zone,
- * the interface must be specified; otherwise, ifa_ifwithaddr()
- * will fail matching the address.
- */
- bzero(&srcsock, sizeof(srcsock));
- srcsock.sin6_family = AF_INET6;
- srcsock.sin6_len = sizeof(srcsock);
- srcsock.sin6_addr = pi->ipi6_addr;
- if (ifp) {
- *errorp = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
- if (*errorp != 0) {
- ifnet_release(ifp);
- return (NULL);
- }
- }
- ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)(&srcsock));
- if (ia6 == NULL) {
- *errorp = EADDRNOTAVAIL;
- if (ifp != NULL)
- ifnet_release(ifp);
- return (NULL);
- }
- IFA_LOCK_SPIN(&ia6->ia_ifa);
- if ((ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY)) ||
- (nocell && (ia6->ia_ifa.ifa_ifp->if_type == IFT_CELLULAR))) {
- IFA_UNLOCK(&ia6->ia_ifa);
- IFA_REMREF(&ia6->ia_ifa);
- *errorp = EADDRNOTAVAIL;
- if (ifp != NULL)
- ifnet_release(ifp);
- return (NULL);
- }
+ if (sifp != NULL) {
+ *sifp = NULL;
+ }
- *src_storage = satosin6(&ia6->ia_addr)->sin6_addr;
- IFA_UNLOCK(&ia6->ia_ifa);
- IFA_REMREF(&ia6->ia_ifa);
- if (ifpp != NULL) {
- /* if ifp is non-NULL, refcnt held in in6_selectif() */
- *ifpp = ifp;
- } else if (ifp != NULL) {
- ifnet_release(ifp);
- }
- return (src_storage);
+ if (ifapp != NULL) {
+ *ifapp = NULL;
}
- /*
- * Otherwise, if the socket has already bound the source, just use it.
- */
- if (inp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
- return (&inp->in6p_laddr);
+ dst = dstsock->sin6_addr; /* make a copy for local operation */
- /*
- * If the address is not specified, choose the best one based on
- * the outgoing interface and the destination address.
- */
+ if (srcsel_debug) {
+ (void) inet_ntop(AF_INET6, &dst, s_dst, sizeof(s_src));
- /* get the outgoing interface */
- if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, ifscope, nocell,
- &ifp)) != 0)
- return (NULL);
+ tmp = &in6addr_any;
+ (void) inet_ntop(AF_INET6, tmp, s_src, sizeof(s_src));
+ printf("%s out src %s dst %s ifp %s\n",
+ __func__, s_src, s_dst, ifp->if_xname);
+ }
-#ifdef DIAGNOSTIC
- if (ifp == NULL) /* this should not happen */
- panic("in6_selectsrc: NULL ifp");
-#endif
*errorp = in6_setscope(&dst, ifp, &odstzone);
if (*errorp != 0) {
- if (ifp != NULL)
- ifnet_release(ifp);
- return (NULL);
+ src_storage = NULL;
+ goto done;
}
- lck_rw_lock_shared(&in6_ifaddr_rwlock);
+ lck_rw_lock_shared(&in6_ifaddr_rwlock);
for (ia = in6_ifaddrs; ia; ia = ia->ia_next) {
int new_scope = -1, new_matchlen = -1;
struct in6_addrpolicy *new_policy = NULL;
- u_int32_t srczone, osrczone, dstzone;
+ u_int32_t srczone = 0, osrczone, dstzone;
struct in6_addr src;
struct ifnet *ifp1 = ia->ia_ifp;
+ int srcrule;
+
+ if (srcsel_debug) {
+ (void) inet_ntop(AF_INET6, &ia->ia_addr.sin6_addr,
+ s_src, sizeof(s_src));
+ }
IFA_LOCK(&ia->ia_ifa);
+
+ /*
+ * Simply skip addresses reserved for CLAT46
+ */
+ if (ia->ia6_flags & IN6_IFF_CLAT46) {
+ SASEL_LOG("NEXT ia %s address on ifp1 %s skipped as it is "
+ "reserved for CLAT46", s_src, ifp1->if_xname);
+ goto next;
+ }
+
+ /*
+ * XXX By default we are strong end system and will
+ * limit candidate set of source address to the ones
+ * configured on the outgoing interface.
+ */
+ if (ip6_select_src_strong_end &&
+ ifp1 != ifp) {
+ SASEL_LOG("NEXT ia %s ifp1 %s address is not on outgoing "
+ "interface \n", s_src, ifp1->if_xname);
+ goto next;
+ }
+
/*
* We'll never take an address that breaks the scope zone
- * of the destination. We also skip an address if its zone
+ * of the destination. We also skip an address if its zone
* does not contain the outgoing interface.
* XXX: we should probably use sin6_scope_id here.
*/
if (in6_setscope(&dst, ifp1, &dstzone) ||
- odstzone != dstzone)
+ odstzone != dstzone) {
+ SASEL_LOG("NEXT ia %s ifp1 %s odstzone %d != dstzone %d\n",
+ s_src, ifp1->if_xname, odstzone, dstzone);
goto next;
-
+ }
src = ia->ia_addr.sin6_addr;
if (in6_setscope(&src, ifp, &osrczone) ||
in6_setscope(&src, ifp1, &srczone) ||
- osrczone != srczone)
+ osrczone != srczone) {
+ SASEL_LOG("NEXT ia %s ifp1 %s osrczone %d != srczone %d\n",
+ s_src, ifp1->if_xname, osrczone, srczone);
goto next;
-
+ }
/* avoid unusable addresses */
if ((ia->ia6_flags &
- (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED)))
+ (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
+ SASEL_LOG("NEXT ia %s ifp1 %s ia6_flags 0x%x\n",
+ s_src, ifp1->if_xname, ia->ia6_flags);
goto next;
-
- if (!ip6_use_deprecated && IFA6_IS_DEPRECATED(ia))
+ }
+ if (!ip6_use_deprecated && IFA6_IS_DEPRECATED(ia, secs)) {
+ SASEL_LOG("NEXT ia %s ifp1 %s IFA6_IS_DEPRECATED\n",
+ s_src, ifp1->if_xname);
goto next;
-
+ }
+ if (!nd6_optimistic_dad &&
+ (ia->ia6_flags & IN6_IFF_OPTIMISTIC) != 0) {
+ SASEL_LOG("NEXT ia %s ifp1 %s IN6_IFF_OPTIMISTIC\n",
+ s_src, ifp1->if_xname);
+ goto next;
+ }
/* Rule 1: Prefer same address */
- if (IN6_ARE_ADDR_EQUAL(&dst, &ia->ia_addr.sin6_addr))
- BREAK(1); /* there should be no better candidate */
-
- if (ia_best == NULL)
- REPLACE(0);
+ if (IN6_ARE_ADDR_EQUAL(&dst, &ia->ia_addr.sin6_addr)) {
+ BREAK(IP6S_SRCRULE_1); /* there should be no better candidate */
+ }
+ if (ia_best == NULL) {
+ REPLACE(IP6S_SRCRULE_0);
+ }
/* Rule 2: Prefer appropriate scope */
- if (dst_scope < 0)
+ if (dst_scope < 0) {
dst_scope = in6_addrscope(&dst);
+ }
new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
- if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0)
- REPLACE(2);
- NEXTSRC(2);
+ if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0) {
+ REPLACE(IP6S_SRCRULE_2);
+ }
+ NEXTSRC(IP6S_SRCRULE_2);
} else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
- if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0)
- NEXTSRC(2);
- REPLACE(2);
+ if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0) {
+ NEXTSRC(IP6S_SRCRULE_2);
+ }
+ REPLACE(IP6S_SRCRULE_2);
}
/*
* Rule 3: Avoid deprecated addresses. Note that the case of
* !ip6_use_deprecated is already rejected above.
*/
- if (!IFA6_IS_DEPRECATED(ia_best) && IFA6_IS_DEPRECATED(ia))
- NEXTSRC(3);
- if (IFA6_IS_DEPRECATED(ia_best) && !IFA6_IS_DEPRECATED(ia))
- REPLACE(3);
+ if (!IFA6_IS_DEPRECATED(ia_best, secs) &&
+ IFA6_IS_DEPRECATED(ia, secs)) {
+ NEXTSRC(IP6S_SRCRULE_3);
+ }
+ if (IFA6_IS_DEPRECATED(ia_best, secs) &&
+ !IFA6_IS_DEPRECATED(ia, secs)) {
+ REPLACE(IP6S_SRCRULE_3);
+ }
+
+ /*
+ * RFC 4429 says that optimistic addresses are equivalent to
+ * deprecated addresses, so avoid them here.
+ */
+ if ((ia_best->ia6_flags & IN6_IFF_OPTIMISTIC) == 0 &&
+ (ia->ia6_flags & IN6_IFF_OPTIMISTIC) != 0) {
+ NEXTSRC(IP6S_SRCRULE_3);
+ }
+ if ((ia_best->ia6_flags & IN6_IFF_OPTIMISTIC) != 0 &&
+ (ia->ia6_flags & IN6_IFF_OPTIMISTIC) == 0) {
+ REPLACE(IP6S_SRCRULE_3);
+ }
/* Rule 4: Prefer home addresses */
/*
*/
/* Rule 5: Prefer outgoing interface */
- if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp)
- NEXTSRC(5);
- if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp)
- REPLACE(5);
+ /*
+ * XXX By default we are strong end with source address
+ * selection. That means all address selection candidate
+ * addresses will be the ones hosted on the outgoing interface
+ * making the following check redundant.
+ */
+ if (ip6_select_src_strong_end == 0) {
+ if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp) {
+ NEXTSRC(IP6S_SRCRULE_5);
+ }
+ if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp) {
+ REPLACE(IP6S_SRCRULE_5);
+ }
+ }
/*
* Rule 6: Prefer matching label
* Note that best_policy should be non-NULL here.
*/
- if (dst_policy == NULL)
+ if (dst_policy == NULL) {
dst_policy = in6_addrsel_lookup_policy(dstsock);
+ }
if (dst_policy->label != ADDR_LABEL_NOTAPP) {
new_policy = in6_addrsel_lookup_policy(&ia->ia_addr);
if (dst_policy->label == best_policy->label &&
- dst_policy->label != new_policy->label)
- NEXTSRC(6);
+ dst_policy->label != new_policy->label) {
+ NEXTSRC(IP6S_SRCRULE_6);
+ }
if (dst_policy->label != best_policy->label &&
- dst_policy->label == new_policy->label)
- REPLACE(6);
+ dst_policy->label == new_policy->label) {
+ REPLACE(IP6S_SRCRULE_6);
+ }
}
/*
- * Rule 7: Prefer public addresses.
+ * Rule 7: Prefer temporary addresses.
* We allow users to reverse the logic by configuring
- * a sysctl variable, so that privacy conscious users can
- * always prefer temporary addresses.
- * Don't use temporary addresses for local destinations or
- * for multicast addresses unless we were passed in an option.
+ * a sysctl variable, so that transparency conscious users can
+ * always prefer stable addresses.
*/
- if (IN6_IS_ADDR_MULTICAST(&dst) ||
- in6_matchlen(&ia_best->ia_addr.sin6_addr, &dst) >=
- in6_mask2len(&ia_best->ia_prefixmask.sin6_addr, NULL))
- islocal = TRUE;
- if (opts == NULL ||
- opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
- prefer_tempaddr = islocal ? 0 : ip6_prefer_tempaddr;
- } else if (opts->ip6po_prefer_tempaddr ==
- IP6PO_TEMPADDR_NOTPREFER) {
- prefer_tempaddr = 0;
- } else
- prefer_tempaddr = 1;
if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
- if (prefer_tempaddr)
- REPLACE(7);
- else
- NEXTSRC(7);
+ if (hint_mask & IPV6_SRCSEL_HINT_PREFER_TMPADDR) {
+ REPLACE(IP6S_SRCRULE_7);
+ } else {
+ NEXTSRC(IP6S_SRCRULE_7);
+ }
}
if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
!(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
- if (prefer_tempaddr)
- NEXTSRC(7);
- else
- REPLACE(7);
+ if (hint_mask & IPV6_SRCSEL_HINT_PREFER_TMPADDR) {
+ NEXTSRC(IP6S_SRCRULE_7);
+ } else {
+ REPLACE(IP6S_SRCRULE_7);
+ }
}
/*
- * Rule 8: prefer addresses on alive interfaces.
+ * Rule 7x: prefer addresses on alive interfaces.
* This is a KAME specific rule.
*/
if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
- !(ia->ia_ifp->if_flags & IFF_UP))
- NEXTSRC(8);
+ !(ia->ia_ifp->if_flags & IFF_UP)) {
+ NEXTSRC(IP6S_SRCRULE_7x);
+ }
if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
- (ia->ia_ifp->if_flags & IFF_UP))
- REPLACE(8);
+ (ia->ia_ifp->if_flags & IFF_UP)) {
+ REPLACE(IP6S_SRCRULE_7x);
+ }
/*
- * Rule 14: Use longest matching prefix.
- * Note: in the address selection draft, this rule is
- * documented as "Rule 8". However, since it is also
- * documented that this rule can be overridden, we assign
- * a large number so that it is easy to assign smaller numbers
- * to more preferred rules.
+ * Rule 8: Use longest matching prefix.
*/
new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, &dst);
- if (best_matchlen < new_matchlen)
- REPLACE(14);
- if (new_matchlen < best_matchlen)
- NEXTSRC(14);
-
- /* Rule 15 is reserved. */
+ if (best_matchlen < new_matchlen) {
+ REPLACE(IP6S_SRCRULE_8);
+ }
+ if (new_matchlen < best_matchlen) {
+ NEXTSRC(IP6S_SRCRULE_8);
+ }
/*
* Last resort: just keep the current candidate.
* Or, do we need more rules?
*/
+ if (ifp1 != ifp && (ifp1->if_eflags & IFEF_EXPENSIVE) &&
+ ip6_select_src_expensive_secondary_if == 0) {
+ SASEL_LOG("NEXT ia %s ifp1 %s IFEF_EXPENSIVE\n",
+ s_src, ifp1->if_xname);
+ ip6stat.ip6s_sources_skip_expensive_secondary_if++;
+ goto next;
+ }
+ SASEL_LOG("NEXT ia %s ifp1 %s last resort\n",
+ s_src, ifp1->if_xname);
IFA_UNLOCK(&ia->ia_ifa);
continue;
replace:
+ /*
+ * Ignore addresses on secondary interfaces that are marked
+ * expensive
+ */
+ if (ifp1 != ifp && (ifp1->if_eflags & IFEF_EXPENSIVE) &&
+ ip6_select_src_expensive_secondary_if == 0) {
+ SASEL_LOG("NEXT ia %s ifp1 %s IFEF_EXPENSIVE\n",
+ s_src, ifp1->if_xname);
+ ip6stat.ip6s_sources_skip_expensive_secondary_if++;
+ goto next;
+ }
+ bestrule = srcrule;
best_scope = (new_scope >= 0 ? new_scope :
- in6_addrscope(&ia->ia_addr.sin6_addr));
+ in6_addrscope(&ia->ia_addr.sin6_addr));
best_policy = (new_policy ? new_policy :
- in6_addrsel_lookup_policy(&ia->ia_addr));
+ in6_addrsel_lookup_policy(&ia->ia_addr));
best_matchlen = (new_matchlen >= 0 ? new_matchlen :
- in6_matchlen(&ia->ia_addr.sin6_addr, &dst));
- IFA_ADDREF_LOCKED(&ia->ia_ifa); /* for ia_best */
+ in6_matchlen(&ia->ia_addr.sin6_addr, &dst));
+ SASEL_LOG("NEXT ia %s ifp1 %s best_scope %d new_scope %d dst_scope %d\n",
+ s_src, ifp1->if_xname, best_scope, new_scope, dst_scope);
+ IFA_ADDREF_LOCKED(&ia->ia_ifa); /* for ia_best */
IFA_UNLOCK(&ia->ia_ifa);
- if (ia_best != NULL)
+ if (ia_best != NULL) {
IFA_REMREF(&ia_best->ia_ifa);
+ }
ia_best = ia;
continue;
continue;
out:
- IFA_ADDREF_LOCKED(&ia->ia_ifa); /* for ia_best */
+ IFA_ADDREF_LOCKED(&ia->ia_ifa); /* for ia_best */
IFA_UNLOCK(&ia->ia_ifa);
- if (ia_best != NULL)
+ if (ia_best != NULL) {
IFA_REMREF(&ia_best->ia_ifa);
+ }
ia_best = ia;
break;
}
lck_rw_done(&in6_ifaddr_rwlock);
- if (nocell && ia_best != NULL &&
- (ia_best->ia_ifa.ifa_ifp->if_type == IFT_CELLULAR)) {
- IFA_REMREF(&ia_best->ia_ifa);
- ia_best = NULL;
+ if ((ia = ia_best) == NULL) {
+ if (*errorp == 0) {
+ *errorp = EADDRNOTAVAIL;
+ }
+ src_storage = NULL;
+ goto done;
}
- if ( (ia = ia_best) == NULL) {
- *errorp = EADDRNOTAVAIL;
- if (ifp != NULL)
- ifnet_release(ifp);
- return (NULL);
+ if (sifp != NULL) {
+ *sifp = ia->ia_ifa.ifa_ifp;
+ ifnet_reference(*sifp);
}
IFA_LOCK_SPIN(&ia->ia_ifa);
+ if (bestrule < IP6S_SRCRULE_COUNT) {
+ ip6stat.ip6s_sources_rule[bestrule]++;
+ }
*src_storage = satosin6(&ia->ia_addr)->sin6_addr;
IFA_UNLOCK(&ia->ia_ifa);
- IFA_REMREF(&ia->ia_ifa);
+
+ if (ifapp != NULL) {
+ *ifapp = &ia->ia_ifa;
+ } else {
+ IFA_REMREF(&ia->ia_ifa);
+ }
+
+done:
+ if (srcsel_debug) {
+ (void) inet_ntop(AF_INET6, &dst, s_dst, sizeof(s_src));
+
+ tmp = (src_storage != NULL) ? src_storage : &in6addr_any;
+ (void) inet_ntop(AF_INET6, tmp, s_src, sizeof(s_src));
+
+ printf("%s out src %s dst %s dst_scope %d best_scope %d\n",
+ __func__, s_src, s_dst, dst_scope, best_scope);
+ }
+
+ return src_storage;
+}
+
+/*
+ * Regardless of error, it will return an ifp with a reference held if the
+ * caller provides a non-NULL ifpp. The caller is responsible for checking
+ * if the returned ifp is valid and release its reference at all times.
+ */
+struct in6_addr *
+in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
+ struct inpcb *inp, struct route_in6 *ro,
+ struct ifnet **ifpp, struct in6_addr *src_storage, unsigned int ifscope,
+ int *errorp)
+{
+ struct ifnet *ifp = NULL;
+ struct in6_pktinfo *pi = NULL;
+ struct ip6_moptions *mopts;
+ struct ip6_out_args ip6oa;
+ boolean_t inp_debug = FALSE;
+ uint32_t hint_mask = 0;
+ int prefer_tempaddr = 0;
+ struct ifnet *sifp = NULL;
+
+ bzero(&ip6oa, sizeof(ip6oa));
+ ip6oa.ip6oa_boundif = ifscope;
+ ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF;
+ ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
+ ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
+
+ *errorp = 0;
+ if (ifpp != NULL) {
+ *ifpp = NULL;
+ }
+
+ if (inp != NULL) {
+ inp_debug = SASEL_DO_DBG(inp);
+ mopts = inp->in6p_moptions;
+ if (INP_NO_CELLULAR(inp)) {
+ ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
+ }
+ if (INP_NO_EXPENSIVE(inp)) {
+ ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
+ }
+ if (INP_AWDL_UNRESTRICTED(inp)) {
+ ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
+ }
+ if (INP_INTCOPROC_ALLOWED(inp)) {
+ ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
+ }
+ } else {
+ mopts = NULL;
+ /* Allow the kernel to retransmit packets. */
+ ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED |
+ IP6OAF_AWDL_UNRESTRICTED;
+ }
+
+ if (ip6oa.ip6oa_boundif != IFSCOPE_NONE) {
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ }
+
+ /*
+ * If the source address is explicitly specified by the caller,
+ * check if the requested source address is indeed a unicast address
+ * assigned to the node, and can be used as the packet's source
+ * address. If everything is okay, use the address as source.
+ */
+ if (opts && (pi = opts->ip6po_pktinfo) &&
+ !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
+ struct sockaddr_in6 srcsock;
+ struct in6_ifaddr *ia6;
+
+ /* get the outgoing interface */
+ if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ip6oa,
+ &ifp)) != 0) {
+ src_storage = NULL;
+ goto done;
+ }
+
+ /*
+ * determine the appropriate zone id of the source based on
+ * the zone of the destination and the outgoing interface.
+ * If the specified address is ambiguous wrt the scope zone,
+ * the interface must be specified; otherwise, ifa_ifwithaddr()
+ * will fail matching the address.
+ */
+ bzero(&srcsock, sizeof(srcsock));
+ srcsock.sin6_family = AF_INET6;
+ srcsock.sin6_len = sizeof(srcsock);
+ srcsock.sin6_addr = pi->ipi6_addr;
+ if (ifp != NULL) {
+ *errorp = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
+ if (*errorp != 0) {
+ src_storage = NULL;
+ goto done;
+ }
+ }
+ ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)
+ (&srcsock));
+ if (ia6 == NULL) {
+ *errorp = EADDRNOTAVAIL;
+ src_storage = NULL;
+ goto done;
+ }
+ IFA_LOCK_SPIN(&ia6->ia_ifa);
+ if ((ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_CLAT46)) ||
+ (inp && inp_restricted_send(inp, ia6->ia_ifa.ifa_ifp))) {
+ IFA_UNLOCK(&ia6->ia_ifa);
+ IFA_REMREF(&ia6->ia_ifa);
+ *errorp = EHOSTUNREACH;
+ src_storage = NULL;
+ goto done;
+ }
+
+ *src_storage = satosin6(&ia6->ia_addr)->sin6_addr;
+ IFA_UNLOCK(&ia6->ia_ifa);
+ IFA_REMREF(&ia6->ia_ifa);
+ goto done;
+ }
+
+ /*
+ * Otherwise, if the socket has already bound the source, just use it.
+ */
+ if (inp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
+ src_storage = &inp->in6p_laddr;
+ goto done;
+ }
+
+ /*
+ * If the address is not specified, choose the best one based on
+ * the outgoing interface and the destination address.
+ */
+ /* get the outgoing interface */
+ if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ip6oa,
+ &ifp)) != 0) {
+ src_storage = NULL;
+ goto done;
+ }
+
+ VERIFY(ifp != NULL);
+
+ if (opts == NULL ||
+ opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
+ prefer_tempaddr = ip6_prefer_tempaddr;
+ } else if (opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_NOTPREFER) {
+ prefer_tempaddr = 0;
+ } else {
+ prefer_tempaddr = 1;
+ }
+
+ if (prefer_tempaddr) {
+ hint_mask |= IPV6_SRCSEL_HINT_PREFER_TMPADDR;
+ }
+
+ if (in6_selectsrc_core(dstsock, hint_mask, ifp, inp_debug, src_storage,
+ &sifp, errorp, NULL) == NULL) {
+ src_storage = NULL;
+ goto done;
+ }
+
+ VERIFY(sifp != NULL);
+
+ if (inp && inp_restricted_send(inp, sifp)) {
+ src_storage = NULL;
+ *errorp = EHOSTUNREACH;
+ ifnet_release(sifp);
+ goto done;
+ } else {
+ ifnet_release(sifp);
+ }
+
+done:
if (ifpp != NULL) {
/* if ifp is non-NULL, refcnt held in in6_selectif() */
*ifpp = ifp;
} else if (ifp != NULL) {
ifnet_release(ifp);
}
- return (src_storage);
+ return src_storage;
}
/*
* i.e. for any given pcb there can only be one thread performing output at
* the IPv6 layer.
*
- * This routine is analogous to in_selectsrcif() for IPv4.
+ * This routine is analogous to in_selectsrcif() for IPv4. Regardless of
+ * error, it will return an ifp with a reference held if the caller provides
+ * a non-NULL retifp. The caller is responsible for checking if the
+ * returned ifp is valid and release its reference at all times.
*
* clone - meaningful only for bsdi and freebsd
*/
static int
selectroute(struct sockaddr_in6 *srcsock, struct sockaddr_in6 *dstsock,
- struct ip6_pktopts *opts, struct ip6_moptions *mopts, struct route_in6 *ro,
+ struct ip6_pktopts *opts, struct ip6_moptions *mopts,
+ struct in6_ifaddr **retsrcia, struct route_in6 *ro,
struct ifnet **retifp, struct rtentry **retrt, int clone,
- int norouteok, unsigned int ifscope, unsigned int nocell)
+ int norouteok, struct ip6_out_args *ip6oa)
{
int error = 0;
- struct ifnet *ifp = NULL;
+ struct ifnet *ifp = NULL, *ifp0 = NULL;
struct route_in6 *route = NULL;
struct sockaddr_in6 *sin6_next;
struct in6_pktinfo *pi = NULL;
struct in6_addr *dst = &dstsock->sin6_addr;
struct ifaddr *ifa = NULL;
char s_src[MAX_IPv6_STR_LEN], s_dst[MAX_IPv6_STR_LEN];
- boolean_t select_srcif;
-
-#if 0
- char ip6buf[INET6_ADDRSTRLEN];
+ boolean_t select_srcif, proxied_ifa = FALSE, local_dst = FALSE;
+ unsigned int ifscope = ((ip6oa != NULL) ?
+ ip6oa->ip6oa_boundif : IFSCOPE_NONE);
- if (dstsock->sin6_addr.s6_addr32[0] == 0 &&
- dstsock->sin6_addr.s6_addr32[1] == 0 &&
- !IN6_IS_ADDR_LOOPBACK(&dstsock->sin6_addr)) {
- printf("in6_selectroute: strange destination %s\n",
- ip6_sprintf(ip6buf, &dstsock->sin6_addr));
- } else {
- printf("in6_selectroute: destination = %s%%%d\n",
- ip6_sprintf(ip6buf, &dstsock->sin6_addr),
- dstsock->sin6_scope_id); /* for debug */
- }
-#endif
-
- if (retifp != NULL)
+ if (retifp != NULL) {
*retifp = NULL;
+ }
- if (retrt != NULL)
+ if (retrt != NULL) {
*retrt = NULL;
+ }
if (ip6_select_srcif_debug) {
struct in6_addr src;
src = (srcsock != NULL) ? srcsock->sin6_addr : in6addr_any;
- (void) inet_ntop(AF_INET6, &src, s_src, sizeof (s_src));
- (void) inet_ntop(AF_INET6, dst, s_dst, sizeof (s_dst));
+ (void) inet_ntop(AF_INET6, &src, s_src, sizeof(s_src));
+ (void) inet_ntop(AF_INET6, dst, s_dst, sizeof(s_dst));
}
/*
* Perform source interface selection only if Scoped Routing
* is enabled and a source address that isn't unspecified.
*/
- select_srcif = (ip6_doscopedroute && srcsock != NULL &&
+ select_srcif = (srcsock != NULL &&
!IN6_IS_ADDR_UNSPECIFIED(&srcsock->sin6_addr));
- /*
- * If Scoped Routing is disabled, ignore the given ifscope.
- * Otherwise even if source selection won't be performed,
- * we still obey IPV6_BOUND_IF.
- */
- if (!ip6_doscopedroute && ifscope != IFSCOPE_NONE)
- ifscope = IFSCOPE_NONE;
+ if (ip6_select_srcif_debug) {
+ printf("%s src %s dst %s ifscope %d select_srcif %d\n",
+ __func__, s_src, s_dst, ifscope, select_srcif);
+ }
/* If the caller specified the outgoing interface explicitly, use it */
if (opts != NULL && (pi = opts->ip6po_pktinfo) != NULL &&
ifscope = pi->ipi6_ifindex;
ifnet_head_lock_shared();
/* ifp may be NULL if detached or out of range */
- ifp = (ifscope <= if_index) ? ifindex2ifnet[ifscope] : NULL;
+ ifp = ifp0 =
+ ((ifscope <= if_index) ? ifindex2ifnet[ifscope] : NULL);
ifnet_head_done();
if (norouteok || retrt == NULL || IN6_IS_ADDR_MULTICAST(dst)) {
/*
* the route and we have no interface to use,
* it's an error.
*/
- if (ifp == NULL)
+ if (ifp == NULL) {
error = EHOSTUNREACH;
+ }
goto done;
} else {
goto getsrcif;
*/
if (IN6_IS_ADDR_MULTICAST(dst) && mopts != NULL) {
IM6O_LOCK(mopts);
- if ((ifp = mopts->im6o_multicast_ifp) != NULL) {
+ if ((ifp = ifp0 = mopts->im6o_multicast_ifp) != NULL) {
IM6O_UNLOCK(mopts);
goto done; /* we do not need a route for multicast. */
}
* If the outgoing interface was not set via IPV6_BOUND_IF or
* IPV6_PKTINFO, use the scope ID in the destination address.
*/
- if (ip6_doscopedroute && ifscope == IFSCOPE_NONE)
+ if (ifscope == IFSCOPE_NONE) {
ifscope = dstsock->sin6_scope_id;
+ }
/*
* Perform source interface selection; the source IPv6 address
* or if we haven't done source interface selection on this
* route (for this PCB instance) before.
*/
- if (!select_srcif || (ro != NULL && ro->ro_rt != NULL &&
- (ro->ro_rt->rt_flags & RTF_UP) &&
- ro->ro_rt->generation_id == route_generation &&
- (ro->ro_flags & ROF_SRCIF_SELECTED))) {
- if (ro != NULL && ro->ro_rt != NULL) {
- ifa = ro->ro_rt->rt_ifa;
- IFA_ADDREF(ifa);
+ if (!select_srcif) {
+ goto getroute;
+ } else if (!ROUTE_UNUSABLE(ro) && ro->ro_srcia != NULL &&
+ (ro->ro_flags & ROF_SRCIF_SELECTED)) {
+ if (ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) {
+ local_dst = TRUE;
}
+ ifa = ro->ro_srcia;
+ IFA_ADDREF(ifa); /* for caller */
goto getroute;
}
if (scope == IFSCOPE_NONE) {
scope = rt_ifp->if_index;
if (scope != get_primary_ifscope(AF_INET6) &&
- ro->ro_rt->generation_id != route_generation)
+ ROUTE_UNUSABLE(ro)) {
scope = get_primary_ifscope(AF_INET6);
+ }
}
ifa = (struct ifaddr *)
ifa_foraddr6_scoped(&srcsock->sin6_addr, scope);
+ /*
+ * If we are forwarding and proxying prefix(es), see if the
+ * source address is one of ours and is a proxied address;
+ * if so, use it.
+ */
+ if (ifa == NULL && ip6_forwarding && nd6_prproxy) {
+ ifa = (struct ifaddr *)
+ ifa_foraddr6(&srcsock->sin6_addr);
+ if (ifa != NULL && !(proxied_ifa =
+ nd6_prproxy_ifaddr((struct in6_ifaddr *)ifa))) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ }
+ }
+
if (ip6_select_srcif_debug && ifa != NULL) {
if (ro->ro_rt != NULL) {
- printf("%s->%s ifscope %d->%d ifa_if %s "
- "ro_if %s\n", s_src, s_dst, ifscope,
+ printf("%s %s->%s ifscope %d->%d ifa_if %s "
+ "ro_if %s\n",
+ __func__,
+ s_src, s_dst, ifscope,
scope, if_name(ifa->ifa_ifp),
if_name(rt_ifp));
} else {
- printf("%s->%s ifscope %d->%d ifa_if %s\n",
+ printf("%s %s->%s ifscope %d->%d ifa_if %s\n",
+ __func__,
s_src, s_dst, ifscope, scope,
if_name(ifa->ifa_ifp));
}
* found interface.
*/
if (ifa == NULL && ifscope == IFSCOPE_NONE) {
+ struct ifaddr *ifadst;
+
+ /* Check if the destination address is one of ours */
+ ifadst = (struct ifaddr *)ifa_foraddr6(&dstsock->sin6_addr);
+ if (ifadst != NULL) {
+ local_dst = TRUE;
+ IFA_REMREF(ifadst);
+ }
+
ifa = (struct ifaddr *)ifa_foraddr6(&srcsock->sin6_addr);
if (ip6_select_srcif_debug && ifa != NULL) {
- printf("%s->%s ifscope %d ifa_if %s\n",
+ printf("%s %s->%s ifscope %d ifa_if %s\n",
+ __func__,
s_src, s_dst, ifscope, if_name(ifa->ifa_ifp));
+ } else if (ip6_select_srcif_debug) {
+ printf("%s %s->%s ifscope %d ifa_if NULL\n",
+ __func__,
+ s_src, s_dst, ifscope);
}
-
}
getroute:
- if (ifa != NULL)
+ if (ifa != NULL && !proxied_ifa && !local_dst) {
ifscope = ifa->ifa_ifp->if_index;
+ }
/*
* If the next hop address for the packet is specified by the caller,
* by that address must be a neighbor of the sending host.
*/
ron = &opts->ip6po_nextroute;
- if (ron->ro_rt != NULL)
+ if (ron->ro_rt != NULL) {
RT_LOCK(ron->ro_rt);
- if ((ron->ro_rt != NULL &&
- ((ron->ro_rt->rt_flags & (RTF_UP | RTF_LLINFO)) !=
- (RTF_UP | RTF_LLINFO) ||
- ron->ro_rt->generation_id != route_generation ||
+ }
+ if (ROUTE_UNUSABLE(ron) || (ron->ro_rt != NULL &&
+ (!(ron->ro_rt->rt_flags & RTF_LLINFO) ||
(select_srcif && (ifa == NULL ||
- ifa->ifa_ifp != ron->ro_rt->rt_ifp)))) ||
+ (ifa->ifa_ifp != ron->ro_rt->rt_ifp && !proxied_ifa))))) ||
!IN6_ARE_ADDR_EQUAL(&satosin6(&ron->ro_dst)->sin6_addr,
&sin6_next->sin6_addr)) {
if (ron->ro_rt != NULL) {
RT_UNLOCK(ron->ro_rt);
- rtfree(ron->ro_rt);
- ron->ro_rt = NULL;
}
+
+ ROUTE_RELEASE(ron);
*satosin6(&ron->ro_dst) = *sin6_next;
}
if (ron->ro_rt == NULL) {
rtalloc_scoped((struct route *)ron, ifscope);
- if (ron->ro_rt != NULL)
+ if (ron->ro_rt != NULL) {
RT_LOCK(ron->ro_rt);
- if (ron->ro_rt == NULL ||
+ }
+ if (ROUTE_UNUSABLE(ron) ||
!(ron->ro_rt->rt_flags & RTF_LLINFO) ||
!IN6_ARE_ADDR_EQUAL(&satosin6(rt_key(ron->ro_rt))->
sin6_addr, &sin6_next->sin6_addr)) {
if (ron->ro_rt != NULL) {
RT_UNLOCK(ron->ro_rt);
- rtfree(ron->ro_rt);
- ron->ro_rt = NULL;
}
+
+ ROUTE_RELEASE(ron);
error = EHOSTUNREACH;
goto done;
}
}
route = ron;
- ifp = ron->ro_rt->rt_ifp;
+ ifp = ifp0 = ron->ro_rt->rt_ifp;
/*
* When cloning is required, try to allocate a route to the
* a new one. Note that we should check the address family of the
* cached destination, in case of sharing the cache with IPv4.
*/
- if (ro == NULL)
+ if (ro == NULL) {
goto done;
- if (ro->ro_rt != NULL)
- RT_LOCK(ro->ro_rt);
- if (ro->ro_rt != NULL && (!(ro->ro_rt->rt_flags & RTF_UP) ||
- satosin6(&ro->ro_dst)->sin6_family != AF_INET6 ||
- ro->ro_rt->generation_id != route_generation ||
+ }
+ if (ro->ro_rt != NULL) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ }
+ if (ROUTE_UNUSABLE(ro) || (ro->ro_rt != NULL &&
+ (satosin6(&ro->ro_dst)->sin6_family != AF_INET6 ||
!IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst) ||
(select_srcif && (ifa == NULL ||
- ifa->ifa_ifp != ro->ro_rt->rt_ifp)))) {
- RT_UNLOCK(ro->ro_rt);
- rtfree(ro->ro_rt);
- ro->ro_rt = NULL;
+ (ifa->ifa_ifp != ro->ro_rt->rt_ifp && !proxied_ifa)))))) {
+ if (ro->ro_rt != NULL) {
+ RT_UNLOCK(ro->ro_rt);
+ }
+
+ ROUTE_RELEASE(ro);
}
if (ro->ro_rt == NULL) {
struct sockaddr_in6 *sa6;
- if (ro->ro_rt != NULL)
+ if (ro->ro_rt != NULL) {
RT_UNLOCK(ro->ro_rt);
+ }
/* No route yet, so try to acquire one */
bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
sa6->sin6_addr = *dst;
if (IN6_IS_ADDR_MULTICAST(dst)) {
ro->ro_rt = rtalloc1_scoped(
- &((struct route *)ro)->ro_dst, 0, 0, ifscope);
+ &((struct route *)ro)->ro_dst, 0, 0, ifscope);
} else {
rtalloc_scoped((struct route *)ro, ifscope);
}
- if (ro->ro_rt != NULL)
- RT_LOCK(ro->ro_rt);
+ if (ro->ro_rt != NULL) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ }
}
/*
* explicitly specified (in case we're asked to clone.)
*/
if (opts != NULL && opts->ip6po_nexthop != NULL) {
- if (ro->ro_rt != NULL)
+ if (ro->ro_rt != NULL) {
RT_UNLOCK(ro->ro_rt);
+ }
goto done;
}
if (ro->ro_rt != NULL) {
RT_LOCK_ASSERT_HELD(ro->ro_rt);
- ifp = ro->ro_rt->rt_ifp;
+ ifp = ifp0 = ro->ro_rt->rt_ifp;
} else {
error = EHOSTUNREACH;
}
validateroute:
if (select_srcif) {
boolean_t has_route = (route != NULL && route->ro_rt != NULL);
+ boolean_t srcif_selected = FALSE;
- if (has_route)
+ if (has_route) {
RT_LOCK_ASSERT_HELD(route->ro_rt);
+ }
/*
* If there is a non-loopback route with the wrong interface,
* or if there is no interface configured with such an address,
if (has_route && (ifa == NULL ||
(ifa->ifa_ifp != ifp && ifp != lo_ifp) ||
!(route->ro_rt->rt_flags & RTF_UP))) {
- if (ip6_select_srcif_debug) {
- if (ifa != NULL) {
- printf("%s->%s ifscope %d ro_if %s "
- "!= ifa_if %s (cached route "
- "cleared)\n", s_src, s_dst,
- ifscope, if_name(ifp),
- if_name(ifa->ifa_ifp));
- } else {
- printf("%s->%s ifscope %d ro_if %s "
- "(no ifa_if found)\n", s_src,
- s_dst, ifscope, if_name(ifp));
+ /*
+ * If the destination address belongs to a proxied
+ * prefix, relax the requirement and allow the packet
+ * to come out of the proxy interface with the source
+ * address of the real interface.
+ */
+ if (ifa != NULL && proxied_ifa &&
+ (route->ro_rt->rt_flags & (RTF_UP | RTF_PROXY)) ==
+ (RTF_UP | RTF_PROXY)) {
+ srcif_selected = TRUE;
+ } else {
+ if (ip6_select_srcif_debug) {
+ if (ifa != NULL) {
+ printf("%s->%s ifscope %d "
+ "ro_if %s != ifa_if %s "
+ "(cached route cleared)\n",
+ s_src, s_dst,
+ ifscope, if_name(ifp),
+ if_name(ifa->ifa_ifp));
+ } else {
+ printf("%s->%s ifscope %d "
+ "ro_if %s (no ifa_if "
+ "found)\n", s_src, s_dst,
+ ifscope, if_name(ifp));
+ }
}
+ RT_UNLOCK(route->ro_rt);
+ ROUTE_RELEASE(route);
+ error = EHOSTUNREACH;
+ /* Undo the settings done above */
+ route = NULL;
+ ifp = NULL; /* ditch ifp; keep ifp0 */
+ has_route = FALSE;
}
- RT_UNLOCK(route->ro_rt);
- rtfree(route->ro_rt);
- route->ro_rt = NULL;
- route->ro_flags &= ~ROF_SRCIF_SELECTED;
- error = EHOSTUNREACH;
- /* Undo the settings done above */
- route = NULL;
- ifp = NULL;
} else if (has_route) {
- route->ro_flags |= ROF_SRCIF_SELECTED;
- route->ro_rt->generation_id = route_generation;
+ srcif_selected = TRUE;
+ }
+
+ if (srcif_selected) {
+ VERIFY(has_route);
+ if (ifa != route->ro_srcia ||
+ !(route->ro_flags & ROF_SRCIF_SELECTED)) {
+ RT_CONVERT_LOCK(route->ro_rt);
+ if (ifa != NULL) {
+ IFA_ADDREF(ifa); /* for route_in6 */
+ }
+ if (route->ro_srcia != NULL) {
+ IFA_REMREF(route->ro_srcia);
+ }
+ route->ro_srcia = ifa;
+ route->ro_flags |= ROF_SRCIF_SELECTED;
+ RT_GENID_SYNC(route->ro_rt);
+ }
RT_UNLOCK(route->ro_rt);
}
} else {
- if (ro->ro_rt != NULL)
+ if (ro->ro_rt != NULL) {
RT_UNLOCK(ro->ro_rt);
+ }
if (ifp != NULL && opts != NULL &&
opts->ip6po_pktinfo != NULL &&
opts->ip6po_pktinfo->ipi6_ifindex != 0) {
}
done:
- if (nocell && error == 0) {
- if ((ifp != NULL && ifp->if_type == IFT_CELLULAR) ||
- (route != NULL && route->ro_rt != NULL &&
- route->ro_rt->rt_ifp->if_type == IFT_CELLULAR)) {
- if (route != NULL && route->ro_rt != NULL) {
- rtfree(route->ro_rt);
- route->ro_rt = NULL;
- route->ro_flags &= ~ROF_SRCIF_SELECTED;
- route = NULL;
- }
- ifp = NULL;
- error = EHOSTUNREACH;
+ /*
+ * Check for interface restrictions.
+ */
+#define CHECK_RESTRICTIONS(_ip6oa, _ifp) \
+ ((((_ip6oa)->ip6oa_flags & IP6OAF_NO_CELLULAR) && \
+ IFNET_IS_CELLULAR(_ifp)) || \
+ (((_ip6oa)->ip6oa_flags & IP6OAF_NO_EXPENSIVE) && \
+ IFNET_IS_EXPENSIVE(_ifp)) || \
+ (!((_ip6oa)->ip6oa_flags & IP6OAF_INTCOPROC_ALLOWED) && \
+ IFNET_IS_INTCOPROC(_ifp)) || \
+ (!((_ip6oa)->ip6oa_flags & IP6OAF_AWDL_UNRESTRICTED) && \
+ IFNET_IS_AWDL_RESTRICTED(_ifp)))
+
+ if (error == 0 && ip6oa != NULL &&
+ ((ifp && CHECK_RESTRICTIONS(ip6oa, ifp)) ||
+ (route && route->ro_rt &&
+ CHECK_RESTRICTIONS(ip6oa, route->ro_rt->rt_ifp)))) {
+ if (route != NULL && route->ro_rt != NULL) {
+ ROUTE_RELEASE(route);
+ route = NULL;
}
+ ifp = NULL; /* ditch ifp; keep ifp0 */
+ error = EHOSTUNREACH;
+ ip6oa->ip6oa_retflags |= IP6OARF_IFDENIED;
+ }
+#undef CHECK_RESTRICTIONS
+
+ /*
+ * If the interface is disabled for IPv6, then ENETDOWN error.
+ */
+ if (error == 0 &&
+ ifp != NULL && (ifp->if_eflags & IFEF_IPV6_DISABLED)) {
+ error = ENETDOWN;
}
if (ifp == NULL && (route == NULL || route->ro_rt == NULL)) {
*/
error = EHOSTUNREACH;
}
- if (error == EHOSTUNREACH)
+ if (error == EHOSTUNREACH || error == ENETDOWN) {
ip6stat.ip6s_noroute++;
+ }
+
+ /*
+ * We'll return ifp regardless of error, so pick it up from ifp0
+ * in case it was nullified above. Caller is responsible for
+ * releasing the ifp if it is non-NULL.
+ */
+ ifp = ifp0;
+ if (retifp != NULL) {
+ if (ifp != NULL) {
+ ifnet_reference(ifp); /* for caller */
+ }
+ *retifp = ifp;
+ }
+
+ if (retsrcia != NULL) {
+ if (ifa != NULL) {
+ IFA_ADDREF(ifa); /* for caller */
+ }
+ *retsrcia = (struct in6_ifaddr *)ifa;
+ }
if (error == 0) {
- if (retifp != NULL) {
- if (ifp != NULL)
- ifnet_reference(ifp); /* for caller */
- *retifp = ifp;
- }
- if (retrt != NULL && route != NULL)
- *retrt = route->ro_rt; /* ro_rt may be NULL */
- } else if (select_srcif && ip6_select_srcif_debug) {
- printf("%s->%s ifscope %d ifa_if %s ro_if %s (error=%d)\n",
+ if (retrt != NULL && route != NULL) {
+ *retrt = route->ro_rt; /* ro_rt may be NULL */
+ }
+ }
+ if (ip6_select_srcif_debug) {
+ printf("%s %s->%s ifscope %d ifa_if %s ro_if %s (error=%d)\n",
+ __func__,
s_src, s_dst, ifscope,
(ifa != NULL) ? if_name(ifa->ifa_ifp) : "NONE",
(ifp != NULL) ? if_name(ifp) : "NONE", error);
}
- if (ifa != NULL)
+ if (ifa != NULL) {
IFA_REMREF(ifa);
+ }
- return (error);
+ return error;
}
-static int
+/*
+ * Regardless of error, it will return an ifp with a reference held if the
+ * caller provides a non-NULL retifp. The caller is responsible for checking
+ * if the returned ifp is valid and release its reference at all times.
+ */
+int
in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
- struct ip6_moptions *mopts, struct route_in6 *ro, unsigned int ifscope,
- unsigned int nocell, struct ifnet **retifp)
+ struct ip6_moptions *mopts, struct route_in6 *ro,
+ struct ip6_out_args *ip6oa, struct ifnet **retifp)
{
- int error;
+ int err = 0;
struct route_in6 sro;
struct rtentry *rt = NULL;
ro = &sro;
}
- if ((error = selectroute(NULL, dstsock, opts, mopts, ro, retifp,
- &rt, 0, 1, ifscope, nocell)) != 0) {
- if (ro == &sro && rt && rt == sro.ro_rt)
- rtfree(rt);
- return (error);
+ if ((err = selectroute(NULL, dstsock, opts, mopts, NULL, ro, retifp,
+ &rt, 0, 1, ip6oa)) != 0) {
+ goto done;
}
/*
* We thus reject the case here.
*/
if (rt && (rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
- int flags = (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
-
- if (ro == &sro && rt && rt == sro.ro_rt)
- rtfree(rt);
- return (flags);
+ err = ((rt->rt_flags & RTF_HOST) ? EHOSTUNREACH : ENETUNREACH);
+ goto done;
}
/*
* destination address (which should probably be one of our own
* addresses.)
*/
- if (rt && rt->rt_ifa && rt->rt_ifa->ifa_ifp) {
- if (*retifp != NULL)
+ if (rt != NULL && rt->rt_ifa != NULL && rt->rt_ifa->ifa_ifp != NULL &&
+ retifp != NULL) {
+ ifnet_reference(rt->rt_ifa->ifa_ifp);
+ if (*retifp != NULL) {
ifnet_release(*retifp);
+ }
*retifp = rt->rt_ifa->ifa_ifp;
- ifnet_reference(*retifp);
}
- if (ro == &sro && rt && rt == sro.ro_rt)
- rtfree(rt);
- return (0);
+done:
+ if (ro == &sro) {
+ VERIFY(rt == NULL || rt == ro->ro_rt);
+ ROUTE_RELEASE(ro);
+ }
+
+ /*
+ * retifp might point to a valid ifp with a reference held;
+ * caller is responsible for releasing it if non-NULL.
+ */
+ return err;
}
/*
+ * Regardless of error, it will return an ifp with a reference held if the
+ * caller provides a non-NULL retifp. The caller is responsible for checking
+ * if the returned ifp is valid and release its reference at all times.
+ *
* clone - meaningful only for bsdi and freebsd
*/
int
in6_selectroute(struct sockaddr_in6 *srcsock, struct sockaddr_in6 *dstsock,
- struct ip6_pktopts *opts, struct ip6_moptions *mopts, struct route_in6 *ro,
- struct ifnet **retifp, struct rtentry **retrt, int clone,
- unsigned int ifscope, unsigned int nocell)
+ struct ip6_pktopts *opts, struct ip6_moptions *mopts,
+ struct in6_ifaddr **retsrcia, struct route_in6 *ro, struct ifnet **retifp,
+ struct rtentry **retrt, int clone, struct ip6_out_args *ip6oa)
{
-
- return (selectroute(srcsock, dstsock, opts, mopts, ro, retifp,
- retrt, clone, 0, ifscope, nocell));
+ return selectroute(srcsock, dstsock, opts, mopts, retsrcia, ro, retifp,
+ retrt, clone, 0, ip6oa);
}
/*
* 2. (If the outgoing interface is detected) the current
* hop limit of the interface specified by router advertisement.
* 3. The system default hoplimit.
-*/
+ */
int
-in6_selecthlim(
- struct in6pcb *in6p,
- struct ifnet *ifp)
+in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
{
if (in6p && in6p->in6p_hops >= 0) {
- return(in6p->in6p_hops);
- } else {
- lck_rw_lock_shared(nd_if_rwlock);
- if (ifp && ifp->if_index < nd_ifinfo_indexlim) {
- u_int8_t chlim = nd_ifinfo[ifp->if_index].chlim;
- lck_rw_done(nd_if_rwlock);
- return (chlim);
+ return in6p->in6p_hops;
+ } else if (NULL != ifp) {
+ u_int8_t chlim;
+ struct nd_ifinfo *ndi = ND_IFINFO(ifp);
+ if (ndi && ndi->initialized) {
+ /* access chlim without lock, for performance */
+ chlim = ndi->chlim;
} else {
- lck_rw_done(nd_if_rwlock);
- return(ip6_defhlim);
+ chlim = ip6_defhlim;
}
+ return chlim;
}
+
+ return ip6_defhlim;
}
/*
* share this function by all *bsd*...
*/
int
-in6_pcbsetport(
- __unused struct in6_addr *laddr,
- struct inpcb *inp,
- struct proc *p,
- int locked)
+in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct proc *p,
+ int locked)
{
struct socket *so = inp->inp_socket;
u_int16_t lport = 0, first, last, *lastport;
int count, error = 0, wild = 0;
+ boolean_t counting_down;
+ bool found;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
kauth_cred_t cred;
+#pragma unused(laddr)
if (!locked) { /* Make sure we don't run into a deadlock: 4052373 */
- if (!lck_rw_try_lock_exclusive(pcbinfo->mtx)) {
+ if (!lck_rw_try_lock_exclusive(pcbinfo->ipi_lock)) {
socket_unlock(inp->inp_socket, 0);
- lck_rw_lock_exclusive(pcbinfo->mtx);
+ lck_rw_lock_exclusive(pcbinfo->ipi_lock);
socket_lock(inp->inp_socket, 0);
}
+
+ /*
+ * Check if a local port was assigned to the inp while
+ * this thread was waiting for the pcbinfo lock
+ */
+ if (inp->inp_lport != 0) {
+ VERIFY(inp->inp_flags2 & INP2_INHASHLIST);
+ lck_rw_done(pcbinfo->ipi_lock);
+
+ /*
+ * It is not an error if another thread allocated
+ * a port
+ */
+ return 0;
+ }
}
/* XXX: this is redundant when called from in6_pcbbind */
- if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
+ if ((so->so_options & (SO_REUSEADDR | SO_REUSEPORT)) == 0) {
wild = INPLOOKUP_WILDCARD;
-
- inp->inp_flags |= INP_ANONPORT;
+ }
if (inp->inp_flags & INP_HIGHPORT) {
- first = ipport_hifirstauto; /* sysctl */
+ first = ipport_hifirstauto; /* sysctl */
last = ipport_hilastauto;
- lastport = &pcbinfo->lasthi;
+ lastport = &pcbinfo->ipi_lasthi;
} else if (inp->inp_flags & INP_LOWPORT) {
cred = kauth_cred_proc_ref(p);
error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
kauth_cred_unref(&cred);
if (error != 0) {
- if (!locked)
- lck_rw_done(pcbinfo->mtx);
+ if (!locked) {
+ lck_rw_done(pcbinfo->ipi_lock);
+ }
return error;
}
- first = ipport_lowfirstauto; /* 1023 */
- last = ipport_lowlastauto; /* 600 */
- lastport = &pcbinfo->lastlow;
+ first = ipport_lowfirstauto; /* 1023 */
+ last = ipport_lowlastauto; /* 600 */
+ lastport = &pcbinfo->ipi_lastlow;
} else {
- first = ipport_firstauto; /* sysctl */
+ first = ipport_firstauto; /* sysctl */
last = ipport_lastauto;
- lastport = &pcbinfo->lastport;
+ lastport = &pcbinfo->ipi_lastport;
}
/*
* Simple check to ensure all ports are not used up causing
* a deadlock here.
- *
- * We split the two cases (up and down) so that the direction
- * is not being tested on each round of the loop.
*/
+ found = false;
if (first > last) {
- /*
- * counting down
- */
+ /* counting down */
count = first - last;
-
- do {
- if (count-- < 0) { /* completely used? */
- /*
- * Undo any address bind that may have
- * occurred above.
- */
- inp->in6p_laddr = in6addr_any;
- inp->in6p_last_outif = 0;
- if (!locked)
- lck_rw_done(pcbinfo->mtx);
- return (EAGAIN);
+ counting_down = TRUE;
+ } else {
+ /* counting up */
+ count = last - first;
+ counting_down = FALSE;
+ }
+ do {
+ if (count-- < 0) { /* completely used? */
+ /*
+ * Undo any address bind that may have
+ * occurred above.
+ */
+ inp->in6p_laddr = in6addr_any;
+ inp->in6p_last_outifp = NULL;
+ if (!locked) {
+ lck_rw_done(pcbinfo->ipi_lock);
}
+ return EAGAIN;
+ }
+ if (counting_down) {
--*lastport;
- if (*lastport > first || *lastport < last)
+ if (*lastport > first || *lastport < last) {
*lastport = first;
- lport = htons(*lastport);
- } while (in6_pcblookup_local(pcbinfo,
- &inp->in6p_laddr, lport, wild));
- } else {
- /*
- * counting up
- */
- count = last - first;
-
- do {
- if (count-- < 0) { /* completely used? */
- /*
- * Undo any address bind that may have
- * occurred above.
- */
- inp->in6p_laddr = in6addr_any;
- inp->in6p_last_outif = 0;
- if (!locked)
- lck_rw_done(pcbinfo->mtx);
- return (EAGAIN);
}
+ } else {
++*lastport;
- if (*lastport < first || *lastport > last)
+ if (*lastport < first || *lastport > last) {
*lastport = first;
- lport = htons(*lastport);
- } while (in6_pcblookup_local(pcbinfo,
- &inp->in6p_laddr, lport, wild));
- }
+ }
+ }
+ lport = htons(*lastport);
+ found = (in6_pcblookup_local(pcbinfo, &inp->in6p_laddr,
+ lport, wild) == NULL);
+ } while (!found);
inp->inp_lport = lport;
+ inp->inp_flags |= INP_ANONPORT;
+
if (in_pcbinshash(inp, 1) != 0) {
inp->in6p_laddr = in6addr_any;
+ inp->in6p_last_outifp = NULL;
+
inp->inp_lport = 0;
- inp->in6p_last_outif = 0;
- if (!locked)
- lck_rw_done(pcbinfo->mtx);
- return (EAGAIN);
+ inp->inp_flags &= ~INP_ANONPORT;
+ if (!locked) {
+ lck_rw_done(pcbinfo->ipi_lock);
+ }
+ return EAGAIN;
}
- if (!locked)
- lck_rw_done(pcbinfo->mtx);
- return(0);
+ if (!locked) {
+ lck_rw_done(pcbinfo->ipi_lock);
+ }
+ return 0;
}
/*
- * * The followings are implementation of the policy table using a
- * * simple tail queue.
- * * XXX such details should be hidden.
- * * XXX implementation using binary tree should be more efficient.
- * */
+ * The followings are implementation of the policy table using a
+ * simple tail queue.
+ * XXX such details should be hidden.
+ * XXX implementation using binary tree should be more efficient.
+ */
struct addrsel_policyent {
- TAILQ_ENTRY(addrsel_policyent) ape_entry;
- struct in6_addrpolicy ape_policy;
+ TAILQ_ENTRY(addrsel_policyent) ape_entry;
+ struct in6_addrpolicy ape_policy;
};
TAILQ_HEAD(addrsel_policyhead, addrsel_policyent);
static void
init_policy_queue(void)
{
-
- TAILQ_INIT(&addrsel_policytab);
+ TAILQ_INIT(&addrsel_policytab);
}
void
addrsel_policy_init(void)
{
/*
- * Default address selection policy based on RFC 3484 and
- * draft-arifumi-6man-rfc3484-revise-03.
+ * Default address selection policy based on RFC 6724.
*/
static const struct in6_addrpolicy defaddrsel[] = {
- /* localhost */
- { .addr = { .sin6_family = AF_INET6,
+ /* Loopback -- prefix=::1/128, precedence=50, label=0 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_LOOPBACK_INIT,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK128,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 60,
- .label = 0 },
- /* ULA */
- { .addr = { .sin6_family = AF_INET6,
- .sin6_addr = {{{ 0xfc }}},
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK7,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 50,
- .label = 1 },
- /* any IPv6 src */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK128,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 50,
+ .label = 0
+ },
+
+ /* Unspecified -- prefix=::/0, precedence=40, label=1 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_ANY_INIT,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK0,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 40,
- .label = 2 },
- /* any IPv4 src */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK0,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 40,
+ .label = 1
+ },
+
+ /* IPv4 Mapped -- prefix=::ffff:0:0/96, precedence=35, label=4 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_V4MAPPED_INIT,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK96,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 30,
- .label = 3 },
- /* 6to4 */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK96,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 35,
+ .label = 4
+ },
+
+ /* 6to4 -- prefix=2002::/16, precedence=30, label=2 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = {{{ 0x20, 0x02 }}},
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK16,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 20,
- .label = 4 },
- /* Teredo */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK16,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 30,
+ .label = 2
+ },
+
+ /* Teredo -- prefix=2001::/32, precedence=5, label=5 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = {{{ 0x20, 0x01 }}},
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK32,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 10,
- .label = 5 },
- /* v4 compat addresses */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK32,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 5,
+ .label = 5
+ },
+
+ /* Unique Local (ULA) -- prefix=fc00::/7, precedence=3, label=13 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = {{{ 0xfc }}},
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK7,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 3,
+ .label = 13
+ },
+
+ /* IPv4 Compatible -- prefix=::/96, precedence=1, label=3 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_ANY_INIT,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK96,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 1,
- .label = 10 },
- /* site-local (deprecated) */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK96,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 1,
+ .label = 3
+ },
+
+ /* Site-local (deprecated) -- prefix=fec0::/10, precedence=1, label=11 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = {{{ 0xfe, 0xc0 }}},
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK16,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 1,
- .label = 11 },
- /* 6bone (deprecated) */
- { .addr = { .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK16,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 1,
+ .label = 11
+ },
+
+ /* 6bone (deprecated) -- prefix=3ffe::/16, precedence=1, label=12 */
+ {
+ .addr = {
+ .sin6_family = AF_INET6,
.sin6_addr = {{{ 0x3f, 0xfe }}},
- .sin6_len = sizeof(struct sockaddr_in6) },
- .addrmask = { .sin6_family = AF_INET6,
- .sin6_addr = IN6MASK16,
- .sin6_len = sizeof(struct sockaddr_in6) },
- .preced = 1,
- .label = 12 },
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .addrmask = {
+ .sin6_family = AF_INET6,
+ .sin6_addr = IN6MASK16,
+ .sin6_len = sizeof(struct sockaddr_in6)
+ },
+ .preced = 1,
+ .label = 12
+ },
};
int i;
bzero(&defaultaddrpolicy, sizeof(defaultaddrpolicy));
defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
- for (i = 0; i < sizeof(defaddrsel) / sizeof(defaddrsel[0]); i++)
+ for (i = 0; i < sizeof(defaddrsel) / sizeof(defaddrsel[0]); i++) {
add_addrsel_policyent(&defaddrsel[i]);
-
+ }
}
struct in6_addrpolicy *
ADDRSEL_LOCK();
match = match_addrsel_policy(key);
- if (match == NULL)
+ if (match == NULL) {
match = &defaultaddrpolicy;
- else
+ } else {
match->use++;
+ }
ADDRSEL_UNLOCK();
- return (match);
+ return match;
}
static struct in6_addrpolicy *
pol = &pent->ape_policy;
mp = (u_char *)&pol->addrmask.sin6_addr;
- ep = mp + 16; /* XXX: scope field? */
+ ep = mp + 16; /* XXX: scope field? */
k = (u_char *)&key->sin6_addr;
p = (u_char *)&pol->addr.sin6_addr;
for (; mp < ep && *mp; mp++, k++, p++) {
m = *mp;
- if ((*k & m) != *p)
+ if ((*k & m) != *p) {
goto next; /* not match */
- if (m == 0xff) /* short cut for a typical case */
+ }
+ if (m == 0xff) { /* short cut for a typical case */
matchlen += 8;
- else {
+ } else {
while (m >= 0x80) {
matchlen++;
m <<= 1;
bestmatchlen = matchlen;
}
- next:
+next:
continue;
}
- return (bestpol);
-}
+ return bestpol;
+}
static int
add_addrsel_policyent(const struct in6_addrpolicy *newpolicy)
struct addrsel_policyent *new, *pol;
MALLOC(new, struct addrsel_policyent *, sizeof(*new), M_IFADDR,
- M_WAITOK);
+ M_WAITOK);
ADDRSEL_LOCK();
/* duplication check */
TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
if (IN6_ARE_ADDR_EQUAL(&newpolicy->addr.sin6_addr,
- &pol->ape_policy.addr.sin6_addr) &&
+ &pol->ape_policy.addr.sin6_addr) &&
IN6_ARE_ADDR_EQUAL(&newpolicy->addrmask.sin6_addr,
- &pol->ape_policy.addrmask.sin6_addr)) {
+ &pol->ape_policy.addrmask.sin6_addr)) {
ADDRSEL_UNLOCK();
FREE(new, M_IFADDR);
- return (EEXIST); /* or override it? */
+ return EEXIST; /* or override it? */
}
}
TAILQ_INSERT_TAIL(&addrsel_policytab, new, ape_entry);
ADDRSEL_UNLOCK();
- return (0);
+ return 0;
}
#ifdef ENABLE_ADDRSEL
static int
}
if (pol == NULL) {
ADDRSEL_UNLOCK();
- return (ESRCH);
+ return ESRCH;
}
TAILQ_REMOVE(&addrsel_policytab, pol, ape_entry);
pol = NULL;
ADDRSEL_UNLOCK();
- return (0);
+ return 0;
}
#endif /* ENABLE_ADDRSEL */
TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
if ((error = (*callback)(&pol->ape_policy, w)) != 0) {
ADDRSEL_UNLOCK();
- return (error);
+ return error;
}
}
ADDRSEL_UNLOCK();
- return (error);
+ return error;
}
/*
* Subroutines to manage the address selection policy table via sysctl.
error = SYSCTL_OUT(w->w_req, pol, sizeof(*pol));
- return (error);
+ return error;
}
static int
-in6_src_sysctl SYSCTL_HANDLER_ARGS
+in6_src_sysctl SYSCTL_HANDLER_ARGS
{
#pragma unused(oidp, arg1, arg2)
-struct walkarg w;
+ struct walkarg w;
- if (req->newptr)
+ if (req->newptr) {
return EPERM;
+ }
bzero(&w, sizeof(w));
w.w_req = req;
- return (walk_addrsel_policy(dump_addrsel_policyent, &w));
+ return walk_addrsel_policy(dump_addrsel_policyent, &w);
}
SYSCTL_NODE(_net_inet6_ip6, IPV6CTL_ADDRCTLPOLICY, addrctlpolicy,
- CTLFLAG_RD | CTLFLAG_LOCKED, in6_src_sysctl, "");
+ CTLFLAG_RD | CTLFLAG_LOCKED, in6_src_sysctl, "");
int
in6_src_ioctl(u_long cmd, caddr_t data)
{
int i;
struct in6_addrpolicy ent0;
- if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY)
- return (EOPNOTSUPP); /* check for safety */
-
- ent0 = *(struct in6_addrpolicy *)data;
+ if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY) {
+ return EOPNOTSUPP; /* check for safety */
+ }
+ bcopy(data, &ent0, sizeof(ent0));
- if (ent0.label == ADDR_LABEL_NOTAPP)
- return (EINVAL);
+ if (ent0.label == ADDR_LABEL_NOTAPP) {
+ return EINVAL;
+ }
/* check if the prefix mask is consecutive. */
- if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0)
- return (EINVAL);
+ if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0) {
+ return EINVAL;
+ }
/* clear trailing garbages (if any) of the prefix address. */
for (i = 0; i < 4; i++) {
ent0.addr.sin6_addr.s6_addr32[i] &=
- ent0.addrmask.sin6_addr.s6_addr32[i];
+ ent0.addrmask.sin6_addr.s6_addr32[i];
}
ent0.use = 0;
switch (cmd) {
case SIOCAADDRCTL_POLICY:
#ifdef ENABLE_ADDRSEL
- return (add_addrsel_policyent(&ent0));
+ return add_addrsel_policyent(&ent0);
#else
- return (ENOTSUP);
+ return ENOTSUP;
#endif
case SIOCDADDRCTL_POLICY:
#ifdef ENABLE_ADDRSEL
- return (delete_addrsel_policyent(&ent0));
+ return delete_addrsel_policyent(&ent0);
#else
- return (ENOTSUP);
+ return ENOTSUP;
#endif
}
- return (0); /* XXX: compromise compilers */
+ return 0; /* XXX: compromise compilers */
}
/*
* we may want to change the function to return something other than ifp.
*/
int
-in6_embedscope(
- struct in6_addr *in6,
- const struct sockaddr_in6 *sin6,
- struct in6pcb *in6p,
- struct ifnet **ifpp,
- struct ip6_pktopts *opt)
+in6_embedscope(struct in6_addr *in6, const struct sockaddr_in6 *sin6,
+ struct in6pcb *in6p, struct ifnet **ifpp, struct ip6_pktopts *opt)
{
struct ifnet *ifp = NULL;
u_int32_t scopeid;
*in6 = sin6->sin6_addr;
scopeid = sin6->sin6_scope_id;
- if (ifpp != NULL)
+ if (ifpp != NULL) {
*ifpp = NULL;
+ }
/*
* don't try to read sin6->sin6_addr beyond here, since the caller may
*/
#ifdef ENABLE_DEFAULT_SCOPE
- if (scopeid == 0)
+ if (scopeid == 0) {
scopeid = scope6_addr2default(in6);
+ }
#endif
- if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
+ if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
struct in6_pktinfo *pi;
struct ifnet *im6o_multicast_ifp = NULL;
IM6O_UNLOCK(in6p->in6p_moptions);
}
- if (opt)
+ if (opt != NULL) {
optp = opt;
- else if (in6p)
+ } else if (in6p != NULL) {
optp = in6p->in6p_outputopts;
+ }
/*
* KAME assumption: link id == interface id
*/
- ifnet_head_lock_shared();
- if (in6p && optp && (pi = optp->ip6po_pktinfo) &&
- pi->ipi6_ifindex) {
- ifp = ifindex2ifnet[pi->ipi6_ifindex];
+ if (in6p != NULL && optp != NULL &&
+ (pi = optp->ip6po_pktinfo) != NULL &&
+ pi->ipi6_ifindex != 0) {
+ /* ifp is needed here if only we're returning it */
+ if (ifpp != NULL) {
+ ifnet_head_lock_shared();
+ ifp = ifindex2ifnet[pi->ipi6_ifindex];
+ ifnet_head_done();
+ }
in6->s6_addr16[1] = htons(pi->ipi6_ifindex);
- } else if (in6p && IN6_IS_ADDR_MULTICAST(in6) &&
+ } else if (in6p != NULL && IN6_IS_ADDR_MULTICAST(in6) &&
in6p->in6p_moptions != NULL && im6o_multicast_ifp != NULL) {
ifp = im6o_multicast_ifp;
in6->s6_addr16[1] = htons(ifp->if_index);
- } else if (scopeid) {
- /*
+ } else if (scopeid != 0) {
+ /*
* Since scopeid is unsigned, we only have to check it
- * against if_index
+ * against if_index (ifnet_head_lock not needed since
+ * if_index is an ever-increasing integer.)
*/
if (if_index < scopeid) {
- ifnet_head_done();
return ENXIO; /* XXX EINVAL? */
-
}
- ifp = ifindex2ifnet[scopeid];
- /*XXX assignment to 16bit from 32bit variable */
+ /* ifp is needed here only if we're returning it */
+ if (ifpp != NULL) {
+ ifnet_head_lock_shared();
+ ifp = ifindex2ifnet[scopeid];
+ ifnet_head_done();
+ }
+ /* XXX assignment to 16bit from 32bit variable */
in6->s6_addr16[1] = htons(scopeid & 0xffff);
}
- ifnet_head_done();
if (ifpp != NULL) {
- if (ifp != NULL)
- ifnet_reference(ifp); /* for caller */
+ if (ifp != NULL) {
+ ifnet_reference(ifp); /* for caller */
+ }
*ifpp = ifp;
}
}
*/
sin6->sin6_scope_id = 0;
- if (IN6_IS_SCOPE_LINKLOCAL(in6)) {
+ if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
/*
* KAME assumption: link id == interface id
*/
scopeid = ntohs(sin6->sin6_addr.s6_addr16[1]);
if (scopeid) {
- /*
- * sanity check
+ /*
+ * sanity check
*
* Since scopeid is unsigned, we only have to check it
* against if_index
*/
- if (if_index < scopeid)
+ if (if_index < scopeid) {
return ENXIO;
- if (ifp && ifp->if_index != scopeid)
+ }
+ if (ifp && ifp->if_index != scopeid) {
return ENXIO;
+ }
sin6->sin6_addr.s6_addr16[1] = 0;
sin6->sin6_scope_id = scopeid;
}
projects / apple / xnu.git / blobdiff