/src/usrsctp/usrsctplib/netinet/sctp_bsd_addr.c

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

#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(__FreeBSD__) && !defined(__Userspace__)
#include <sys/unistd.h>
#endif

/* Declare all of our malloc named types */
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");

/* Global NON-VNET structure that controls the iterator */
struct iterator_control sctp_it_ctl;
#if !(defined(__FreeBSD__) && !defined(__Userspace__))

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(_WIN32)
  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)
{
#if defined(__Userspace__)
  sctp_userspace_set_threadname("SCTP iterator");
#endif
  SCTP_IPI_ITERATOR_WQ_LOCK();
  /* In FreeBSD this thread never terminates. */
#if defined(__FreeBSD__) && !defined(__Userspace__)
  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__)
           sctp_it_ctl.ipi_iterator_wq_mtx,
#endif
           0, "waiting_for_work", 0);
#else
#if defined(_WIN32)
    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__) && !defined(__Userspace__))
    if (sctp_it_ctl.iterator_flags & SCTP_ITERATOR_MUST_EXIT) {
      break;
    }
#endif
    sctp_iterator_worker();
  }
#if !(defined(__FreeBSD__) && !defined(__Userspace__))
  /* 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(__Userspace__)
  if (sctp_userspace_thread_create(&sctp_it_ctl.thread_proc, &sctp_iterator_thread)) {
    SCTP_PRINTF("ERROR: Creating sctp_iterator_thread failed.\n");
  } else {
    SCTP_BASE_VAR(iterator_thread_started) = 1;
  }
#elif defined(__FreeBSD__)
  kproc_create(sctp_iterator_thread,
               (void *)NULL,
               &sctp_it_ctl.thread_proc,
               0,
               SCTP_KTHREAD_PAGES,
               SCTP_KTRHEAD_NAME);
#elif defined(__APPLE__)
  kernel_thread_start((thread_continue_t)sctp_iterator_thread, NULL, &sctp_it_ctl.thread_proc);
#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__) && !defined(__Userspace__)
  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__) && !defined(__Userspace__))
  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__) && !defined(__Userspace__)

int
sctp_is_vmware_interface(struct ifnet *ifn)
{
  return (strncmp(ifnet_name(ifn), "vmnet", 5) == 0);
}

#endif

#if defined(_WIN32) && defined(__Userspace__)
#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 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);
    FREE(pAdapterAddrs);
    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;
        }
        sctp_ifa = sctp_add_addr_to_vrf(0,
                                        NULL,
                                        pAdapt->IfIndex,
                                        (pAdapt->IfType == IF_TYPE_IEEE80211)?MIB_IF_TYPE_ETHERNET:pAdapt->IfType,
                                        pAdapt->AdapterName,
                                        NULL,
                                        pUnicast->Address.lpSockaddr,
                                        pAdapt->Flags,
                                        0);
        if (sctp_ifa) {
          sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
        }
      }
    }
  }
  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);
    FREE(pAdapterAddrs);
    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) {
        sctp_ifa = sctp_add_addr_to_vrf(0,
                                        NULL,
                                        pAdapt->Ipv6IfIndex,
                                        (pAdapt->IfType == IF_TYPE_IEEE80211)?MIB_IF_TYPE_ETHERNET:pAdapt->IfType,
                                        pAdapt->AdapterName,
                                        NULL,
                                        pUnicast->Address.lpSockaddr,
                                        pAdapt->Flags,
                                        0);
        if (sctp_ifa) {
          sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
        }
      }
    }
  }
  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, *ifas;
  struct sctp_ifa *sctp_ifa;
  uint32_t ifa_flags;

  rc = getifaddrs(&ifas);
  if (rc != 0) {
    return;
  }
  for (ifa = ifas; 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 unspecified 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,
                                    NULL,
                                    if_nametoindex(ifa->ifa_name),
                                    0,
                                    ifa->ifa_name,
                                    NULL,
                                    ifa->ifa_addr,
                                    ifa_flags,
                                    0);
    if (sctp_ifa) {
      sctp_ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
    }
  }
  freeifaddrs(ifas);
#endif
}
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
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 unspecified 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;
      }
      SCTP_SNPRINTF(name, SCTP_IFNAMSIZ, "%s%d", ifnet_name(ifn), ifnet_unit(ifn));
      sctp_ifa = sctp_add_addr_to_vrf(vrfid,
                                      (void *)ifn, /* XXX */
                                      ifnet_index(ifn),
                                      ifnet_type(ifn),
                                      name,
                                      (void *)ifa, /* XXX */
                                      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__) && !defined(__Userspace__)
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 epoch_tracker et;
  struct ifnet *ifn;
  struct ifaddr *ifa;
  struct sctp_ifa *sctp_ifa;
  uint32_t ifa_flags;
#ifdef INET6
  struct in6_ifaddr *ifa6;
#endif

  IFNET_RLOCK();
  NET_EPOCH_ENTER(et);
  CK_STAILQ_FOREACH(ifn, &MODULE_GLOBAL(ifnet), if_link) {
    if (sctp_is_desired_interface_type(ifn) == 0) {
      /* non desired type */
      continue;
    }
    CK_STAILQ_FOREACH(ifa, &ifn->if_addrhead, ifa_link) {
      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 unspecified 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;
      }
    }
  }
  NET_EPOCH_EXIT(et);
  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;

  if (SCTP_BASE_VAR(sctp_pcb_initialized) == 0) {
    return;
  }
  /* 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 management 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 unspecified 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__) && !defined(__Userspace__)
                               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,
                           (void *)ifa->ifa_ifp,
#if defined(__APPLE__) && !defined(__Userspace__)
                           ifnet_index(ifa->ifa_ifp));
#else
                           ifa->ifa_ifp->if_index);
#endif

    /* We don't bump refcount here so when it completes
     * the final delete will happen.
     */
  }
#endif
}

#if defined(__FreeBSD__) && !defined(__Userspace__)
void
sctp_addr_change_event_handler(void *arg __unused, struct ifaddr *ifa, int cmd) {
  sctp_addr_change(ifa, cmd);
}
#endif
#if defined(__APPLE__) && !defined(__Userspace__)
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(__FreeBSD__) || defined(__Userspace__)
#if defined(__Userspace__)
  m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0, allonebuf);
#else
  m = m_getm2(NULL, space_needed, how, type, want_header ? M_PKTHDR : 0);
#endif
  if (m == NULL) {
    /* bad, no memory */
    return (m);
  }
#if !defined(__Userspace__)
  if (allonebuf) {
    if (SCTP_BUF_SIZE(m) < space_needed) {
      m_freem(m);
      return (NULL);
    }
    KASSERT(SCTP_BUF_NEXT(m) == NULL, ("%s: no chain allowed", __func__));
  }
#endif
#ifdef SCTP_MBUF_LOGGING
  if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
    sctp_log_mb(m, SCTP_MBUF_IALLOC);
  }
#endif
#else
  int mbuf_threshold;
  unsigned int size;

  if (want_header) {
    MGETHDR(m, how, type);
    size = MHLEN;
  } else {
    MGET(m, how, type);
    size = MLEN;
  }
  if (m == NULL) {
    return (NULL);
  }
  if (allonebuf == 0) {
    mbuf_threshold = SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count);
  } else {
    mbuf_threshold = 1;
  }

  if (space_needed > (unsigned int)(((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);
    }
    size = SCTP_BUF_EXTEND_SIZE(m);
  }
  if (allonebuf != 0 && size < space_needed) {
    m_freem(m);
    return (NULL);
  }
  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) {
    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 this_copy;
  int *lenat;
  int did_delay = 0;

  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

Coverage Report

Created: 2025-07-11 06:39