The Tor Browser / file revision

 /*-

  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.

  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.

  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  * a) Redistributions of source code must retain the above copyright notice,

  *    this list of conditions and the following disclaimer.

  *

  * b) Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in

  *    the documentation and/or other materials provided with the distribution.

  *

  * c) Neither the name of Cisco Systems, Inc. nor the names of its

  *    contributors may be used to endorse or promote products derived

  *    from this software without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

  * THE POSSIBILITY OF SUCH DAMAGE.

  */

 #ifdef __FreeBSD__

 #include <sys/cdefs.h>

 __FBSDID("$FreeBSD: head/sys/netinet/sctp_bsd_addr.c 258765 2013-11-30 12:51:19Z tuexen $");

 #endif

 #include <netinet/sctp_os.h>

 #include <netinet/sctp_var.h>

 #include <netinet/sctp_pcb.h>

 #include <netinet/sctp_header.h>

 #include <netinet/sctputil.h>

 #include <netinet/sctp_output.h>

 #include <netinet/sctp_bsd_addr.h>

 #include <netinet/sctp_uio.h>

 #include <netinet/sctputil.h>

 #include <netinet/sctp_timer.h>

 #include <netinet/sctp_asconf.h>

 #include <netinet/sctp_sysctl.h>

 #include <netinet/sctp_indata.h>

 #if defined(ANDROID)

 #include <unistd.h>

 #include <ifaddrs-android-ext.h>

 #else

 #if defined(__FreeBSD__)

 #include <sys/unistd.h>

 #endif

 #endif

 /* Declare all of our malloc named types */

 #ifndef __Panda__

 MALLOC_DEFINE(SCTP_M_MAP, "sctp_map", "sctp asoc map descriptor");

 MALLOC_DEFINE(SCTP_M_STRMI, "sctp_stri", "sctp stream in array");

 MALLOC_DEFINE(SCTP_M_STRMO, "sctp_stro", "sctp stream out array");

 MALLOC_DEFINE(SCTP_M_ASC_ADDR, "sctp_aadr", "sctp asconf address");

 MALLOC_DEFINE(SCTP_M_ASC_IT, "sctp_a_it", "sctp asconf iterator");

 MALLOC_DEFINE(SCTP_M_AUTH_CL, "sctp_atcl", "sctp auth chunklist");

 MALLOC_DEFINE(SCTP_M_AUTH_KY, "sctp_atky", "sctp auth key");

 MALLOC_DEFINE(SCTP_M_AUTH_HL, "sctp_athm", "sctp auth hmac list");

 MALLOC_DEFINE(SCTP_M_AUTH_IF, "sctp_athi", "sctp auth info");

 MALLOC_DEFINE(SCTP_M_STRESET, "sctp_stre", "sctp stream reset");

 MALLOC_DEFINE(SCTP_M_CMSG, "sctp_cmsg", "sctp CMSG buffer");

 MALLOC_DEFINE(SCTP_M_COPYAL, "sctp_cpal", "sctp copy all");

 MALLOC_DEFINE(SCTP_M_VRF, "sctp_vrf", "sctp vrf struct");

 MALLOC_DEFINE(SCTP_M_IFA, "sctp_ifa", "sctp ifa struct");

 MALLOC_DEFINE(SCTP_M_IFN, "sctp_ifn", "sctp ifn struct");

 MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");

 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");

 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");

 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");

 MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue");

 #endif

 /* Global NON-VNET structure that controls the iterator */

 struct iterator_control sctp_it_ctl;

 #if !defined(__FreeBSD__)

 static void

 sctp_cleanup_itqueue(void)

 {

 	struct sctp_iterator *it, *nit;

 	TAILQ_FOREACH_SAFE(it, &sctp_it_ctl.iteratorhead, sctp_nxt_itr, nit) {

 		if (it->function_atend != NULL) {

 			(*it->function_atend) (it->pointer, it->val);

 		}

 		TAILQ_REMOVE(&sctp_it_ctl.iteratorhead, it, sctp_nxt_itr);

 		SCTP_FREE(it, SCTP_M_ITER);

 	}

 }

 #endif

 #if defined(__Userspace__)

 /*__Userspace__ TODO if we use thread based iterator

  * then the implementation of wakeup will need to change.

  * Currently we are using timeo_cond for ident so_timeo

  * but that is not sufficient if we need to use another ident

  * like wakeup(&sctppcbinfo.iterator_running);

  */

 #endif

 void

 sctp_wakeup_iterator(void)

 {

 #if defined(SCTP_PROCESS_LEVEL_LOCKS)

 #if defined(__Userspace_os_Windows)

 	WakeAllConditionVariable(&sctp_it_ctl.iterator_wakeup);

 #else

 	pthread_cond_broadcast(&sctp_it_ctl.iterator_wakeup);

 #endif

 #else

 	wakeup(&sctp_it_ctl.iterator_running);

 #endif

 }

 #if defined(__Userspace__)

 static void *

 #else

 static void

 #endif

 sctp_iterator_thread(void *v SCTP_UNUSED)

 {

 	SCTP_IPI_ITERATOR_WQ_LOCK();

 	/* In FreeBSD this thread never terminates. */

 #if defined(__FreeBSD__)

 	for (;;) {

 #else

 	while ((sctp_it_ctl.iterator_flags & SCTP_ITERATOR_MUST_EXIT) == 0) {

 #endif

 #if !defined(__Userspace__)

 		msleep(&sctp_it_ctl.iterator_running,

 #if defined(__FreeBSD__)

 		       &sctp_it_ctl.ipi_iterator_wq_mtx,

 #elif defined(__APPLE__) || defined(__Userspace_os_Darwin)

 		       sctp_it_ctl.ipi_iterator_wq_mtx,

 #endif

 		       0, "waiting_for_work", 0);

 #else

 #if defined(__Userspace_os_Windows)

 		SleepConditionVariableCS(&sctp_it_ctl.iterator_wakeup, &sctp_it_ctl.ipi_iterator_wq_mtx, INFINITE);

 #else

 		pthread_cond_wait(&sctp_it_ctl.iterator_wakeup, &sctp_it_ctl.ipi_iterator_wq_mtx);

 #endif

 #endif

 #if !defined(__FreeBSD__)

 		if (sctp_it_ctl.iterator_flags & SCTP_ITERATOR_MUST_EXIT) {

 			break;

 		}

 #endif

 		sctp_iterator_worker();

 	}

 #if !defined(__FreeBSD__)

 	/* Now this thread needs to be terminated */

 	sctp_cleanup_itqueue();

 	sctp_it_ctl.iterator_flags |= SCTP_ITERATOR_EXITED;

 	SCTP_IPI_ITERATOR_WQ_UNLOCK();

 #if defined(__Userspace__)

 	sctp_wakeup_iterator();

 	return (NULL);

 #else

 	wakeup(&sctp_it_ctl.iterator_flags);

 	thread_terminate(current_thread());

 #ifdef INVARIANTS

 	panic("Hmm. thread_terminate() continues...");

 #endif

 #endif

 #endif

 }

 void

 sctp_startup_iterator(void)

 {

 	if (sctp_it_ctl.thread_proc) {

 		/* You only get one */

 		return;

 	}

 	/* Initialize global locks here, thus only once. */

 	SCTP_ITERATOR_LOCK_INIT();

 	SCTP_IPI_ITERATOR_WQ_INIT();

 	TAILQ_INIT(&sctp_it_ctl.iteratorhead);

 #if defined(__FreeBSD__)

 #if __FreeBSD_version <= 701000

 	kthread_create(sctp_iterator_thread,

 #else

 	kproc_create(sctp_iterator_thread,

 #endif

 	             (void *)NULL,

 	             &sctp_it_ctl.thread_proc,

 	             RFPROC,

 	             SCTP_KTHREAD_PAGES,

 	             SCTP_KTRHEAD_NAME);

 #elif defined(__APPLE__)

 	kernel_thread_start((thread_continue_t)sctp_iterator_thread, NULL, &sctp_it_ctl.thread_proc);

 #elif defined(__Userspace__)

 #if defined(__Userspace_os_Windows)

 	if ((sctp_it_ctl.thread_proc = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)&sctp_iterator_thread, NULL, 0, NULL)) == NULL) {

 #else

 	if (pthread_create(&sctp_it_ctl.thread_proc, NULL, &sctp_iterator_thread, NULL)) {

 #endif

 		SCTP_PRINTF("ERROR: Creating sctp_iterator_thread failed.\n");

 	}

 #endif

 }

 #ifdef INET6

 #if defined(__Userspace__)

 /* __Userspace__ TODO. struct in6_ifaddr is defined in sys/netinet6/in6_var.h

    ip6_use_deprecated is defined as  int ip6_use_deprecated = 1; in /src/sys/netinet6/in6_proto.c

  */

 void

 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)

 {

     return; /* stub */

 }

 #else

 void

 sctp_gather_internal_ifa_flags(struct sctp_ifa *ifa)

 {

 	struct in6_ifaddr *ifa6;

 	ifa6 = (struct in6_ifaddr *)ifa->ifa;

 	ifa->flags = ifa6->ia6_flags;

 	if (!MODULE_GLOBAL(ip6_use_deprecated)) {

 		if (ifa->flags &

 		    IN6_IFF_DEPRECATED) {

 			ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;

 		} else {

 			ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;

 		}

 	} else {

 		ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;

 	}

 	if (ifa->flags &

 	    (IN6_IFF_DETACHED |

 	     IN6_IFF_ANYCAST |

 	     IN6_IFF_NOTREADY)) {

 		ifa->localifa_flags |= SCTP_ADDR_IFA_UNUSEABLE;

 	} else {

 		ifa->localifa_flags &= ~SCTP_ADDR_IFA_UNUSEABLE;

 	}

 }

 #endif /* __Userspace__ */

 #endif /* INET6 */

 #if !defined(__Userspace__)

 static uint32_t

 sctp_is_desired_interface_type(struct ifnet *ifn)

 {

 	int result;

 	/* check the interface type to see if it's one we care about */

 #if defined(__APPLE__)

 	switch(ifnet_type(ifn)) {

 #else

 	switch (ifn->if_type) {

 #endif

 	case IFT_ETHER:

 	case IFT_ISO88023:

 	case IFT_ISO88024:

 	case IFT_ISO88025:

 	case IFT_ISO88026:

 	case IFT_STARLAN:

 	case IFT_P10:

 	case IFT_P80:

 	case IFT_HY:

 	case IFT_FDDI:

 	case IFT_XETHER:

 	case IFT_ISDNBASIC:

 	case IFT_ISDNPRIMARY:

 	case IFT_PTPSERIAL:

 	case IFT_OTHER:

 	case IFT_PPP:

 	case IFT_LOOP:

 	case IFT_SLIP:

 	case IFT_GIF:

 	case IFT_L2VLAN:

 	case IFT_STF:

 #if !defined(__APPLE__)

 	case IFT_IP:

 	case IFT_IPOVERCDLC:

 	case IFT_IPOVERCLAW:

 	case IFT_PROPVIRTUAL: /* NetGraph Virtual too */

 	case IFT_VIRTUALIPADDRESS:

 #endif

 		result = 1;

 		break;

 	default:

 		result = 0;

 	}

 	return (result);

 }

 #endif

 #if defined(__APPLE__)

 int

 sctp_is_vmware_interface(struct ifnet *ifn)

 {

 	return (strncmp(ifnet_name(ifn), "vmnet", 5) == 0);

 }

 #endif

 #if defined(__Userspace_os_Windows)

 #ifdef MALLOC

 #undef MALLOC

 #define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))

 #endif

 #ifdef FREE

 #undef FREE

 #define FREE(x) HeapFree(GetProcessHeap(), 0, (x))

 #endif

 static void

 sctp_init_ifns_for_vrf(int vrfid)

 {

 #if defined(INET) || defined(INET6)

 	struct ifaddrs *ifa;

 	struct sctp_ifa *sctp_ifa;

 	DWORD Err, AdapterAddrsSize;

 	PIP_ADAPTER_ADDRESSES pAdapterAddrs, pAdapt;

 	PIP_ADAPTER_UNICAST_ADDRESS pUnicast;

 #endif

 #ifdef INET

 	AdapterAddrsSize = 0;

 	if ((Err = GetAdaptersAddresses(AF_INET, 0, NULL, NULL, &AdapterAddrsSize)) != 0) {

 		if ((Err != ERROR_BUFFER_OVERFLOW) && (Err != ERROR_INSUFFICIENT_BUFFER)) {

 			SCTP_PRINTF("GetAdaptersV4Addresses() sizing failed with error code %d\n", Err);

 			SCTP_PRINTF("err = %d; AdapterAddrsSize = %d\n", Err, AdapterAddrsSize);

 			return;

 		}

 	}

 	/* Allocate memory from sizing information */

 	if ((pAdapterAddrs = (PIP_ADAPTER_ADDRESSES) GlobalAlloc(GPTR, AdapterAddrsSize)) == NULL) {

 		SCTP_PRINTF("Memory allocation error!\n");

 		return;

 	}

 	/* Get actual adapter information */

 	if ((Err = GetAdaptersAddresses(AF_INET, 0, NULL, pAdapterAddrs, &AdapterAddrsSize)) != ERROR_SUCCESS) {

 		SCTP_PRINTF("GetAdaptersV4Addresses() failed with error code %d\n", Err);

 		return;

 	}

 	/* Enumerate through each returned adapter and save its information */

 	for (pAdapt = pAdapterAddrs; pAdapt; pAdapt = pAdapt->Next) {

 		if (pAdapt->IfType == IF_TYPE_IEEE80211 || pAdapt->IfType == IF_TYPE_ETHERNET_CSMACD) {

 			for (pUnicast = pAdapt->FirstUnicastAddress; pUnicast; pUnicast = pUnicast->Next) {

 				if (IN4_ISLINKLOCAL_ADDRESS(&(((struct sockaddr_in *)(pUnicast->Address.lpSockaddr))->sin_addr))) {

 					continue;

 				}

 				ifa = (struct ifaddrs*)malloc(sizeof(struct ifaddrs));

 				ifa->ifa_name = strdup(pAdapt->AdapterName);

 				ifa->ifa_flags = pAdapt->Flags;

 				ifa->ifa_addr = (struct sockaddr *)malloc(sizeof(struct sockaddr_in));

 				memcpy(ifa->ifa_addr, pUnicast->Address.lpSockaddr, sizeof(struct sockaddr_in));

 				sctp_ifa = sctp_add_addr_to_vrf(0,

 				                                ifa,

 				                                pAdapt->IfIndex,

 				                                (pAdapt->IfType == IF_TYPE_IEEE80211)?MIB_IF_TYPE_ETHERNET:pAdapt->IfType,

 				                                ifa->ifa_name,

 				                                (void *)ifa,

 				                                ifa->ifa_addr,

 				                                ifa->ifa_flags,

 				                                0);

 				if (sctp_ifa) {

 					sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;

 				}

 			}

 		}

 	}

 	if (pAdapterAddrs)

 		FREE(pAdapterAddrs);

 #endif

 #ifdef INET6

 	AdapterAddrsSize = 0;

 	if ((Err = GetAdaptersAddresses(AF_INET6, 0, NULL, NULL, &AdapterAddrsSize)) != 0) {

 		if ((Err != ERROR_BUFFER_OVERFLOW) && (Err != ERROR_INSUFFICIENT_BUFFER)) {

 			SCTP_PRINTF("GetAdaptersV6Addresses() sizing failed with error code %d\n", Err);

 			SCTP_PRINTF("err = %d; AdapterAddrsSize = %d\n", Err, AdapterAddrsSize);

 			return;

 		}

 	}

 	/* Allocate memory from sizing information */

 	if ((pAdapterAddrs = (PIP_ADAPTER_ADDRESSES) GlobalAlloc(GPTR, AdapterAddrsSize)) == NULL) {

 		SCTP_PRINTF("Memory allocation error!\n");

 		return;

 	}

 	/* Get actual adapter information */

 	if ((Err = GetAdaptersAddresses(AF_INET6, 0, NULL, pAdapterAddrs, &AdapterAddrsSize)) != ERROR_SUCCESS) {

 		SCTP_PRINTF("GetAdaptersV6Addresses() failed with error code %d\n", Err);

 		return;

 	}

 	/* Enumerate through each returned adapter and save its information */

 	for (pAdapt = pAdapterAddrs; pAdapt; pAdapt = pAdapt->Next) {

 		if (pAdapt->IfType == IF_TYPE_IEEE80211 || pAdapt->IfType == IF_TYPE_ETHERNET_CSMACD) {

 			for (pUnicast = pAdapt->FirstUnicastAddress; pUnicast; pUnicast = pUnicast->Next) {

 				ifa = (struct ifaddrs*)malloc(sizeof(struct ifaddrs));

 				ifa->ifa_name = strdup(pAdapt->AdapterName);

 				ifa->ifa_flags = pAdapt->Flags;

 				ifa->ifa_addr = (struct sockaddr *)malloc(sizeof(struct sockaddr_in6));

 				memcpy(ifa->ifa_addr, pUnicast->Address.lpSockaddr, sizeof(struct sockaddr_in6));

 				sctp_ifa = sctp_add_addr_to_vrf(0,

 				                                ifa,

 				                                pAdapt->Ipv6IfIndex,

 				                                (pAdapt->IfType == IF_TYPE_IEEE80211)?MIB_IF_TYPE_ETHERNET:pAdapt->IfType,

 				                                ifa->ifa_name,

 				                                (void *)ifa,

 				                                ifa->ifa_addr,

 				                                ifa->ifa_flags,

 				                                0);

 				if (sctp_ifa) {

 					sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;

 				}

 			}

 		}

 	}

 	if (pAdapterAddrs)

 		FREE(pAdapterAddrs);

 #endif

 }

 #elif defined(__Userspace__)

 static void

 sctp_init_ifns_for_vrf(int vrfid)

 {

 #if defined(INET) || defined(INET6)

 	int rc;

 	struct ifaddrs *ifa = NULL;

 	struct sctp_ifa *sctp_ifa;

 	uint32_t ifa_flags;

 	rc = getifaddrs(&g_interfaces);

 	if (rc != 0) {

 		return;

 	}

 	for (ifa = g_interfaces; ifa; ifa = ifa->ifa_next) {

 		if (ifa->ifa_addr == NULL) {

 			continue;

 		}

 #if !defined(INET)

 		if (ifa->ifa_addr->sa_family != AF_INET6) {

 			/* non inet6 skip */

 			continue;

 		}

 #elif !defined(INET6)

 		if (ifa->ifa_addr->sa_family != AF_INET) {

 			/* non inet skip */

 			continue;

 		}

 #else

 		if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {

 			/* non inet/inet6 skip */

 			continue;

 		}

 #endif

 #if defined(INET6)

 		if ((ifa->ifa_addr->sa_family == AF_INET6) &&

 		    IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {

 			/* skip unspecifed addresses */

 			continue;

 		}

 #endif

 #if defined(INET)

 		if (ifa->ifa_addr->sa_family == AF_INET &&

 		    ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {

 			continue;

 		}

 #endif

 		ifa_flags = 0;

 		sctp_ifa = sctp_add_addr_to_vrf(vrfid,

 		                                ifa,

 		                                if_nametoindex(ifa->ifa_name),

 		                                0,

 		                                ifa->ifa_name,

 		                                (void *)ifa,

 		                                ifa->ifa_addr,

 		                                ifa_flags,

 		                                0);

 		if (sctp_ifa) {

 			sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;

 		}

 	}

 #endif

 }

 #endif

 #if defined(__APPLE__)

 static void

 sctp_init_ifns_for_vrf(int vrfid)

 {

 	/* Here we must apply ANY locks needed by the

 	 * IFN we access and also make sure we lock

 	 * any IFA that exists as we float through the

 	 * list of IFA's

 	 */

 	struct ifnet **ifnetlist;

 	uint32_t i, j, count;

 	char name[SCTP_IFNAMSIZ];

 	struct ifnet *ifn;

 	struct ifaddr **ifaddrlist;

 	struct ifaddr *ifa;

 	struct in6_ifaddr *ifa6;

 	struct sctp_ifa *sctp_ifa;

 	uint32_t ifa_flags;

 	if (ifnet_list_get(IFNET_FAMILY_ANY, &ifnetlist, &count) != 0) {

 		return;

 	}

 	for (i = 0; i < count; i++) {

 		ifn = ifnetlist[i];

 		if (SCTP_BASE_SYSCTL(sctp_ignore_vmware_interfaces) && sctp_is_vmware_interface(ifn)) {

 			continue;

 		}

 		if (sctp_is_desired_interface_type(ifn) == 0) {

 			/* non desired type */

 			continue;

 		}

 		if (ifnet_get_address_list(ifn, &ifaddrlist) != 0) {

 			continue;

 		}

 		for (j = 0; ifaddrlist[j] != NULL; j++) {

 			ifa = ifaddrlist[j];

 			if (ifa->ifa_addr == NULL) {

 				continue;

 			}

 			if ((ifa->ifa_addr->sa_family != AF_INET) && (ifa->ifa_addr->sa_family != AF_INET6)) {

 				/* non inet/inet6 skip */

 				continue;

 			}

 			if (ifa->ifa_addr->sa_family == AF_INET6) {

 				if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {

 					/* skip unspecifed addresses */

 					continue;

 				}

 			} else {

 				if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == INADDR_ANY) {

 					continue;

 				}

 			}

 			if (ifa->ifa_addr->sa_family == AF_INET6) {

 				ifa6 = (struct in6_ifaddr *)ifa;

 				ifa_flags = ifa6->ia6_flags;

 			} else {

 				ifa_flags = 0;

 			}

 			snprintf(name, SCTP_IFNAMSIZ, "%s%d", ifnet_name(ifn), ifnet_unit(ifn));

 			sctp_ifa = sctp_add_addr_to_vrf(vrfid,

 			                                (void *)ifn,

 			                                ifnet_index(ifn),

 			                                ifnet_type(ifn),

 			                                name,

 			                                (void *)ifa,

 			                                ifa->ifa_addr,

 			                                ifa_flags,

 			                                0);

 			if (sctp_ifa) {

 				sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;

 			}

 		}

 		ifnet_free_address_list(ifaddrlist);

 	}

 	ifnet_list_free(ifnetlist);

 }

 #endif

 #if defined(__FreeBSD__)

 static void

 sctp_init_ifns_for_vrf(int vrfid)

 {

 	/* Here we must apply ANY locks needed by the

 	 * IFN we access and also make sure we lock

 	 * any IFA that exists as we float through the

 	 * list of IFA's

 	 */

 	struct ifnet *ifn;

 	struct ifaddr *ifa;

 	struct sctp_ifa *sctp_ifa;

 	uint32_t ifa_flags;

 #ifdef INET6

 	struct in6_ifaddr *ifa6;

 #endif

 	IFNET_RLOCK();

 	TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {

 		if (sctp_is_desired_interface_type(ifn) == 0) {

 			/* non desired type */

 			continue;

 		}

 #if (__FreeBSD_version >= 803000 && __FreeBSD_version < 900000) || __FreeBSD_version > 900000

 		IF_ADDR_RLOCK(ifn);

 #else

 		IF_ADDR_LOCK(ifn);

 #endif

 		TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {

 			if (ifa->ifa_addr == NULL) {

 				continue;

 			}

 			switch (ifa->ifa_addr->sa_family) {

 #ifdef INET

 			case AF_INET:

 				if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {

 					continue;

 				}

 				break;

 #endif

 #ifdef INET6

 			case AF_INET6:

 				if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {

 					/* skip unspecifed addresses */

 					continue;

 				}

 				break;

 #endif

 			default:

 				continue;

 			}

 			switch (ifa->ifa_addr->sa_family) {

 #ifdef INET

 			case AF_INET:

 				ifa_flags = 0;

 				break;

 #endif

 #ifdef INET6

 			case AF_INET6:

 				ifa6 = (struct in6_ifaddr *)ifa;

 				ifa_flags = ifa6->ia6_flags;

 				break;

 #endif

 			default:

 				ifa_flags = 0;

 				break;

 			}

 			sctp_ifa = sctp_add_addr_to_vrf(vrfid,

 			                                (void *)ifn,

 			                                ifn->if_index,

 			                                ifn->if_type,

 			                                ifn->if_xname,

 			                                (void *)ifa,

 			                                ifa->ifa_addr,

 			                                ifa_flags,

 			                                0);

 			if (sctp_ifa) {

 				sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;

 			}

 		}

 #if (__FreeBSD_version >= 803000 && __FreeBSD_version < 900000) || __FreeBSD_version > 900000

 		IF_ADDR_RUNLOCK(ifn);

 #else

 		IF_ADDR_UNLOCK(ifn);

 #endif

 	}

 	IFNET_RUNLOCK();

 }

 #endif

 void

 sctp_init_vrf_list(int vrfid)

 {

 	if (vrfid > SCTP_MAX_VRF_ID)

 		/* can't do that */

 		return;

 	/* Don't care about return here */

 	(void)sctp_allocate_vrf(vrfid);

 	/* Now we need to build all the ifn's

 	 * for this vrf and there addresses

 	 */

 	sctp_init_ifns_for_vrf(vrfid);

 }

 void

 sctp_addr_change(struct ifaddr *ifa, int cmd)

 {

 #if defined(__Userspace__)

         return;

 #else

 	uint32_t ifa_flags = 0;

 	/* BSD only has one VRF, if this changes

 	 * we will need to hook in the right

 	 * things here to get the id to pass to

 	 * the address managment routine.

 	 */

 	if (SCTP_BASE_VAR(first_time) == 0) {

 		/* Special test to see if my ::1 will showup with this */

 		SCTP_BASE_VAR(first_time) = 1;

 		sctp_init_ifns_for_vrf(SCTP_DEFAULT_VRFID);

 	}

 	if ((cmd != RTM_ADD) && (cmd != RTM_DELETE)) {

 		/* don't know what to do with this */

 		return;

 	}

 	if (ifa->ifa_addr == NULL) {

 		return;

 	}

 	if (sctp_is_desired_interface_type(ifa->ifa_ifp) == 0) {

 		/* non desired type */

 		return;

 	}

 	switch (ifa->ifa_addr->sa_family) {

 #ifdef INET

 	case AF_INET:

 		if (((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == 0) {

 			return;

 		}

 		break;

 #endif

 #ifdef INET6

 	case AF_INET6:

 		ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags;

 		if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) {

 			/* skip unspecifed addresses */

 			return;

 		}

 		break;

 #endif

 	default:

 		/* non inet/inet6 skip */

 		return;

 	}

 	if (cmd == RTM_ADD) {

 		(void)sctp_add_addr_to_vrf(SCTP_DEFAULT_VRFID, (void *)ifa->ifa_ifp,

 #if defined(__APPLE__)

 		                           ifnet_index(ifa->ifa_ifp), ifnet_type(ifa->ifa_ifp), ifnet_name(ifa->ifa_ifp),

 #else

 		                           ifa->ifa_ifp->if_index, ifa->ifa_ifp->if_type, ifa->ifa_ifp->if_xname,

 #endif

 		                           (void *)ifa, ifa->ifa_addr, ifa_flags, 1);

 	} else {

 		sctp_del_addr_from_vrf(SCTP_DEFAULT_VRFID, ifa->ifa_addr,

 #if defined(__APPLE__)

 		                       ifnet_index(ifa->ifa_ifp),

 		                       ifnet_name(ifa->ifa_ifp));

 #else

 		                       ifa->ifa_ifp->if_index,

 		                       ifa->ifa_ifp->if_xname);

 #endif

 		/* We don't bump refcount here so when it completes

 		 * the final delete will happen.

 		 */

 	}

 #endif

 }

 #if defined(__FreeBSD__)

 void

 sctp_add_or_del_interfaces(int (*pred)(struct ifnet *), int add)

 {

 	struct ifnet *ifn;

 	struct ifaddr *ifa;

 	IFNET_RLOCK();

 	TAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_list) {

 		if (!(*pred)(ifn)) {

 			continue;

 		}

 		TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {

 			sctp_addr_change(ifa, add ? RTM_ADD : RTM_DELETE);

 		}

 	}

 	IFNET_RUNLOCK();

 }

 #endif

 #if defined(__APPLE__)

 void

 sctp_add_or_del_interfaces(int (*pred)(struct ifnet *), int add)

 {

 	struct ifnet **ifnetlist;

 	struct ifaddr **ifaddrlist;

 	uint32_t i, j, count;

 	if (ifnet_list_get(IFNET_FAMILY_ANY, &ifnetlist, &count) != 0) {

 		return;

 	}

 	for (i = 0; i < count; i++) {

 		if (!(*pred)(ifnetlist[i])) {

 			continue;

 		}

 		if (ifnet_get_address_list(ifnetlist[i], &ifaddrlist) != 0) {

 			continue;

 		}

 		for (j = 0; ifaddrlist[j] != NULL; j++) {

 			sctp_addr_change(ifaddrlist[j], add ? RTM_ADD : RTM_DELETE);

 		}

 		ifnet_free_address_list(ifaddrlist);

 	}

 	ifnet_list_free(ifnetlist);

 	return;

 }

 #endif

 struct mbuf *

 sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header,

 		      int how, int allonebuf, int type)

 {

     struct mbuf *m = NULL;

 #if defined(__Userspace__)

   /*

    * __Userspace__

    * Using m_clget, which creates and mbuf and a cluster and

    * hooks those together.

    * TODO: This does not yet have functionality for jumbo packets.

    *

    */

 	int mbuf_threshold;

 	if (want_header) {

 		MGETHDR(m, how, type);

 	} else {

 		MGET(m, how, type);

 	}

 	if (m == NULL) {

 		return (NULL);

 	}

 	if (allonebuf == 0)

 		mbuf_threshold = SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count);

 	else

 		mbuf_threshold = 1;

 	if ((int)space_needed > (((mbuf_threshold - 1) * MLEN) + MHLEN)) {

 		MCLGET(m, how);

 		if (m == NULL) {

 			return (NULL);

 		}

 		if (SCTP_BUF_IS_EXTENDED(m) == 0) {

 		  sctp_m_freem(m);

 		  return (NULL);

 		}

 	}

 	SCTP_BUF_LEN(m) = 0;

 	SCTP_BUF_NEXT(m) = SCTP_BUF_NEXT_PKT(m) = NULL;

 #if defined(__Userspace__)

 	/* __Userspace__

 	 * Check if anything need to be done to ensure logging works

 	 */

 #endif

 #ifdef SCTP_MBUF_LOGGING

 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {

 		if (SCTP_BUF_IS_EXTENDED(m)) {

 			sctp_log_mb(m, SCTP_MBUF_IALLOC);

 		}

 	}

 #endif

 #elif defined(__FreeBSD__) && __FreeBSD_version > 602000

 	m =  m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);

 	if (m == NULL) {

 		/* bad, no memory */

 		return (m);

 	}

 	if (allonebuf) {

 		int siz;

 		if (SCTP_BUF_IS_EXTENDED(m)) {

 			siz = SCTP_BUF_EXTEND_SIZE(m);

 		} else {

 			if (want_header)

 				siz = MHLEN;

 			else

 				siz = MLEN;

 		}

 		if (siz < space_needed) {

 			m_freem(m);

 			return (NULL);

 		}

 	}

 	if (SCTP_BUF_NEXT(m)) {

 		sctp_m_freem( SCTP_BUF_NEXT(m));

 		SCTP_BUF_NEXT(m) = NULL;

 	}

 #ifdef SCTP_MBUF_LOGGING

 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {

 		if (SCTP_BUF_IS_EXTENDED(m)) {

 			sctp_log_mb(m, SCTP_MBUF_IALLOC);

 		}

 	}

 #endif

 #else

 #if defined(__FreeBSD__) && __FreeBSD_version >= 601000

 	int aloc_size;

 	int index = 0;

 #endif

 	int mbuf_threshold;

 	if (want_header) {

 		MGETHDR(m, how, type);

 	} else {

 		MGET(m, how, type);

 	}

 	if (m == NULL) {

 		return (NULL);

 	}

 	if (allonebuf == 0)

 		mbuf_threshold = SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count);

 	else

 		mbuf_threshold = 1;

 	if (space_needed > (((mbuf_threshold - 1) * MLEN) + MHLEN)) {

 #if defined(__FreeBSD__) && __FreeBSD_version >= 601000

 	try_again:

 		index = 4;

 		if (space_needed <= MCLBYTES) {

 			aloc_size = MCLBYTES;

 		} else {

 			aloc_size = MJUMPAGESIZE;

 			index = 5;

 		}

 		m_cljget(m, how, aloc_size);

 		if (m == NULL) {

 			return (NULL);

 		}

 		if (SCTP_BUF_IS_EXTENDED(m) == 0) {

 			if ((aloc_size != MCLBYTES) &&

 			   (allonebuf == 0)) {

 				aloc_size -= 10;

 				goto try_again;

 			}

 			sctp_m_freem(m);

 			return (NULL);

 		}

 #else

 		MCLGET(m, how);

 		if (m == NULL) {

 			return (NULL);

 		}

 		if (SCTP_BUF_IS_EXTENDED(m) == 0) {

 			sctp_m_freem(m);

 			return (NULL);

 		}

 #endif

 	}

 	SCTP_BUF_LEN(m) = 0;

 	SCTP_BUF_NEXT(m) = SCTP_BUF_NEXT_PKT(m) = NULL;

 #ifdef SCTP_MBUF_LOGGING

 	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {

 		if (SCTP_BUF_IS_EXTENDED(m)) {

 			sctp_log_mb(m, SCTP_MBUF_IALLOC);

 		}

 	}

 #endif

 #endif

 	return (m);

 }

 #ifdef SCTP_PACKET_LOGGING

 void

 sctp_packet_log(struct mbuf *m)

 {

 	int *lenat, thisone;

 	void *copyto;

 	uint32_t *tick_tock;

 	int length;

 	int total_len;

 	int grabbed_lock = 0;

 	int value, newval, thisend, thisbegin;

 	/*

 	 * Buffer layout.

 	 * -sizeof this entry (total_len)

 	 * -previous end      (value)

 	 * -ticks of log      (ticks)

 	 * o -ip packet

 	 * o -as logged

 	 * - where this started (thisbegin)

 	 * x <--end points here

 	 */

 	length = SCTP_HEADER_LEN(m);

 	total_len = SCTP_SIZE32((length + (4 * sizeof(int))));

 	/* Log a packet to the buffer. */

 	if (total_len> SCTP_PACKET_LOG_SIZE) {

 		/* Can't log this packet I have not a buffer big enough */

 		return;

 	}

 	if (length < (int)(SCTP_MIN_V4_OVERHEAD + sizeof(struct sctp_cookie_ack_chunk))) {

 		return;

 	}

 	atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), 1);

  try_again:

 	if (SCTP_BASE_VAR(packet_log_writers) > SCTP_PKTLOG_WRITERS_NEED_LOCK) {

 		SCTP_IP_PKTLOG_LOCK();

 		grabbed_lock = 1;

 	again_locked:

 		value = SCTP_BASE_VAR(packet_log_end);

 		newval = SCTP_BASE_VAR(packet_log_end) + total_len;

 		if (newval >= SCTP_PACKET_LOG_SIZE) {

 			/* we wrapped */

 			thisbegin = 0;

 			thisend = total_len;

 		} else {

 			thisbegin = SCTP_BASE_VAR(packet_log_end);

 			thisend = newval;

 		}

 		if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {

 			goto again_locked;

 		}

 	} else {

 		value = SCTP_BASE_VAR(packet_log_end);

 		newval = SCTP_BASE_VAR(packet_log_end) + total_len;

 		if (newval >= SCTP_PACKET_LOG_SIZE) {

 			/* we wrapped */

 			thisbegin = 0;

 			thisend = total_len;

 		} else {

 			thisbegin = SCTP_BASE_VAR(packet_log_end);

 			thisend = newval;

 		}

 		if (!(atomic_cmpset_int(&SCTP_BASE_VAR(packet_log_end), value, thisend))) {

 			goto try_again;

 		}

 	}

 	/* Sanity check */

 	if (thisend >= SCTP_PACKET_LOG_SIZE) {

 		SCTP_PRINTF("Insanity stops a log thisbegin:%d thisend:%d writers:%d lock:%d end:%d\n",

 		            thisbegin,

 		            thisend,

 		            SCTP_BASE_VAR(packet_log_writers),

 		            grabbed_lock,

 		            SCTP_BASE_VAR(packet_log_end));

 		SCTP_BASE_VAR(packet_log_end) = 0;

 		goto no_log;

 	}

 	lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisbegin];

 	*lenat = total_len;

 	lenat++;

 	*lenat = value;

 	lenat++;

 	tick_tock = (uint32_t *)lenat;

 	lenat++;

 	*tick_tock = sctp_get_tick_count();

 	copyto = (void *)lenat;

 	thisone = thisend - sizeof(int);

 	lenat = (int *)&SCTP_BASE_VAR(packet_log_buffer)[thisone];

 	*lenat = thisbegin;

 	if (grabbed_lock) {

 		SCTP_IP_PKTLOG_UNLOCK();

 		grabbed_lock = 0;

 	}

 	m_copydata(m, 0, length, (caddr_t)copyto);

  no_log:

 	if (grabbed_lock) {

 		SCTP_IP_PKTLOG_UNLOCK();

 	}

 	atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers), 1);

 }

 int

 sctp_copy_out_packet_log(uint8_t *target, int length)

 {

 	/* We wind through the packet log starting at

 	 * start copying up to length bytes out.

 	 * We return the number of bytes copied.

 	 */

 	int tocopy, this_copy;

 	int *lenat;

 	int did_delay = 0;

 	tocopy = length;

 	if (length < (int)(2 * sizeof(int))) {

 		/* not enough room */

 		return (0);

 	}

 	if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {

 		atomic_add_int(&SCTP_BASE_VAR(packet_log_writers), SCTP_PKTLOG_WRITERS_NEED_LOCK);

 	again:

 		if ((did_delay == 0) && (SCTP_BASE_VAR(packet_log_writers) != SCTP_PKTLOG_WRITERS_NEED_LOCK)) {

 			/* we delay here for just a moment hoping the writer(s) that were

 			 * present when we entered will have left and we only have

 			 * locking ones that will contend with us for the lock. This

 			 * does not assure 100% access, but its good enough for

 			 * a logging facility like this.

 			 */

 			did_delay = 1;

 			DELAY(10);

 			goto again;

 		}

 	}

 	SCTP_IP_PKTLOG_LOCK();

 	lenat = (int *)target;

 	*lenat = SCTP_BASE_VAR(packet_log_end);

 	lenat++;

 	this_copy = min((length - sizeof(int)), SCTP_PACKET_LOG_SIZE);

 	memcpy((void *)lenat, (void *)SCTP_BASE_VAR(packet_log_buffer), this_copy);

 	if (SCTP_PKTLOG_WRITERS_NEED_LOCK) {

 		atomic_subtract_int(&SCTP_BASE_VAR(packet_log_writers),

 				    SCTP_PKTLOG_WRITERS_NEED_LOCK);

 	}

 	SCTP_IP_PKTLOG_UNLOCK();

 	return (this_copy + sizeof(int));

 }

 #endif