/*
- * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
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;
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)
+
#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)]++; \
+ 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)]++; \
+ 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)
-/*
- * 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)
+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 ifnet *ifp = NULL;
struct in6_ifaddr *ia = NULL, *ia_best = NULL;
- struct in6_pktinfo *pi = 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;
- struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
- u_int32_t odstzone;
- int prefer_tempaddr;
- struct ip6_moptions *mopts;
- struct ip6_out_args ip6oa = { ifscope, { 0 }, IP6OAF_SELECT_SRCIF, 0 };
- boolean_t islocal = FALSE;
uint64_t secs = net_uptime();
+ VERIFY(dstsock != NULL);
+ VERIFY(src_storage != NULL);
+ VERIFY(ifp != NULL);
- dst = dstsock->sin6_addr; /* make a copy for local operation */
- *errorp = 0;
- if (ifpp != NULL)
- *ifpp = NULL;
-
- if (inp != NULL) {
- 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;
-
- } else {
- mopts = NULL;
- }
-
- if (ip6oa.ip6oa_boundif != IFSCOPE_NONE)
- ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ if (sifp != NULL)
+ *sifp = NULL;
- /*
- * 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;
+ if (ifapp != NULL)
+ *ifapp = NULL;
- /* 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)) ||
- (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;
- }
+ dst = dstsock->sin6_addr; /* make a copy for local operation */
- *src_storage = satosin6(&ia6->ia_addr)->sin6_addr;
- IFA_UNLOCK(&ia6->ia_ifa);
- IFA_REMREF(&ia6->ia_ifa);
- goto done;
- }
+ if (srcsel_debug) {
+ (void) inet_ntop(AF_INET6, &dst, s_dst, sizeof (s_src));
- /*
- * 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;
+ 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);
}
*errorp = in6_setscope(&dst, ifp, &odstzone);
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);
+
+ /*
+ * 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, secs))
+ }
+ 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)
+ (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(IP6S_SRCRULE_1); /* there should be no better candidate */
*/
/* Rule 5: Prefer outgoing interface */
- 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 5.5: Prefer addresses in a prefix advertised by the next hop. */
- if (ro != NULL && ro->ro_rt != NULL && ia_best->ia6_ndpr != NULL &&
- ia->ia6_ndpr != NULL) {
- struct rtentry *rta, *rtb;
- int op;
-
- NDPR_LOCK(ia_best->ia6_ndpr);
- rta = ia_best->ia6_ndpr->ndpr_rt;
- if (rta != NULL)
- RT_ADDREF(rta);
- NDPR_UNLOCK(ia_best->ia6_ndpr);
-
- NDPR_LOCK(ia->ia6_ndpr);
- rtb = ia->ia6_ndpr->ndpr_rt;
- if (rtb != NULL)
- RT_ADDREF(rtb);
- NDPR_UNLOCK(ia->ia6_ndpr);
-
- if (rta == NULL || rtb == NULL)
- op = 0;
- else if (rta == ro->ro_rt && rtb != ro->ro_rt)
- op = 1;
- else if (rta != ro->ro_rt && rtb == ro->ro_rt)
- op = 2;
- else
- op = 0;
-
- if (rta != NULL)
- RT_REMREF(rta);
- if (rtb != NULL)
- RT_REMREF(rtb);
-
- switch (op) {
- case 1:
- NEXTSRC(IP6S_SRCRULE_5_5);
- break;
- case 2:
- REPLACE(IP6S_SRCRULE_5_5);
- break;
- default:
- break;
- }
+ /*
+ * 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);
}
/*
* We allow users to reverse the logic by configuring
* a sysctl variable, so that transparency conscious users can
* always prefer stable addresses.
- * Don't use temporary addresses for local destinations or
- * for multicast addresses unless we were passed in an option.
*/
- if (IN6_IS_ADDR_MULTICAST(&dst) ||
- in6_matchlen(&ia_best->ia_addr.sin6_addr, &dst) >=
- ia_best->ia_plen)
- 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)
+ 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)
+ if (hint_mask & IPV6_SRCSEL_HINT_PREFER_TMPADDR)
NEXTSRC(IP6S_SRCRULE_7);
else
REPLACE(IP6S_SRCRULE_7);
* 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));
best_policy = (new_policy ? new_policy :
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 */
+ 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)
IFA_REMREF(&ia_best->ia_ifa);
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)
IFA_REMREF(&ia_best->ia_ifa);
lck_rw_done(&in6_ifaddr_rwlock);
- if (ia_best != NULL && inp &&
- inp_restricted_send(inp, ia_best->ia_ifa.ifa_ifp)) {
- IFA_REMREF(&ia_best->ia_ifa);
- ia_best = NULL;
- *errorp = EHOSTUNREACH;
- }
-
if ((ia = ia_best) == NULL) {
if (*errorp == 0)
*errorp = EADDRNOTAVAIL;
goto done;
}
+ 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 = { ifscope, { 0 }, IP6OAF_SELECT_SRCIF, 0,
+ SO_TC_UNSPEC, _NET_SERVICE_TYPE_UNSPEC };
+ boolean_t inp_debug = FALSE;
+ uint32_t hint_mask = 0;
+ int prefer_tempaddr = 0;
+ struct ifnet *sifp = NULL;
+
+ *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)) ||
+ (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() */
unsigned int ifscope = ((ip6oa != NULL) ?
ip6oa->ip6oa_boundif : IFSCOPE_NONE);
-#if 0
- char ip6buf[INET6_ADDRSTRLEN];
-
- 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)
*retifp = NULL;
* 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 &&
* 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;
/*
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));
}
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:
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)))
+ IFNET_IS_AWDL_RESTRICTED(_ifp)))
if (error == 0 && ip6oa != NULL &&
((ifp && CHECK_RESTRICTIONS(ip6oa, ifp)) ||
- (route && route->ro_rt &&
+ (route && route->ro_rt &&
CHECK_RESTRICTIONS(ip6oa, route->ro_rt->rt_ifp)))) {
if (route != NULL && route->ro_rt != NULL) {
ROUTE_RELEASE(route);
if (error == 0) {
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 (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);
* 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.
*/
-static int
+int
in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
struct ip6_moptions *mopts, struct route_in6 *ro,
struct ip6_out_args *ip6oa, struct ifnet **retifp)
{
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;
- struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
-
- if (ndi->initialized) {
- /* access chlim without lock, for performance */
- chlim = ndi->chlim;
- } else {
- chlim = ip6_defhlim;
- }
- lck_rw_done(nd_if_rwlock);
- return (chlim);
+ } 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);
}
/*
struct socket *so = inp->inp_socket;
u_int16_t lport = 0, first, last, *lastport;
int count, error = 0, wild = 0;
+ bool found;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
kauth_cred_t cred;
if (!locked) { /* Make sure we don't run into a deadlock: 4052373 */
* counting down
*/
count = first - last;
+ found = false;
do {
if (count-- < 0) { /* completely used? */
if (*lastport > first || *lastport < last)
*lastport = first;
lport = htons(*lastport);
- } while (in6_pcblookup_local(pcbinfo, &inp->in6p_laddr, lport,
- wild));
+
+ found = in6_pcblookup_local(pcbinfo, &inp->in6p_laddr,
+ lport, wild) == NULL;
+ } while (!found);
} else {
/* counting up */
count = last - first;
+ found = false;
do {
if (count-- < 0) { /* completely used? */
if (*lastport < first || *lastport > last)
*lastport = first;
lport = htons(*lastport);
- } while (in6_pcblookup_local(pcbinfo, &inp->in6p_laddr, lport,
- wild));
+
+ found = in6_pcblookup_local(pcbinfo, &inp->in6p_laddr,
+ lport, wild) == NULL;
+ } while (!found);
}
inp->inp_lport = lport;
projects / apple / xnu.git / blobdiff