--- a/configure.in
+++ b/configure.in
@@ -2972,21 +2972,55 @@ freebsd*|openbsd*)
     ;;
 esac
 MOZ_CHECK_COMMON_HEADERS
 
 dnl These are all the places some variant of statfs can be hiding.
 MOZ_CHECK_HEADERS(sys/statvfs.h sys/statfs.h sys/vfs.h sys/mount.h)
 
 dnl Quota support
+dnl SCTP support - needs various network include headers
 MOZ_CHECK_HEADERS(sys/quota.h sys/sysmacros.h)
-MOZ_CHECK_HEADERS(linux/quota.h)
+MOZ_CHECK_HEADERS([linux/quota.h linux/if_addr.h linux/rtnetlink.h],,,[#include <sys/socket.h>])
 
 MOZ_CHECK_HEADERS(sys/types.h netinet/in.h byteswap.h)
 
+dnl Check for sin_len and sin6_len - used by SCTP; only appears in Mac/*BSD generally
+AC_CACHE_CHECK(for sockaddr_in.sin_len,
+                   ac_cv_sockaddr_in_sin_len,
+                   [AC_TRY_COMPILE([#ifdef HAVE_SYS_TYPES_H
+                                    #include <sys/types.h>
+                                    #endif
+                                    #include <netinet/in.h>
+                                    struct sockaddr_in x;
+                                    void *foo = (void*) &x.sin_len;],
+                                   [],
+                                   [ac_cv_sockaddr_in_sin_len=true],
+                                   [ac_cv_sockaddr_in_sin_len=false])])
+if test "$ac_cv_sockaddr_in_sin_len" = true ; then
+  AC_DEFINE(HAVE_SIN_LEN)
+dnl HAVE_CONN_LEN must be the same as HAVE_SIN_LEN (and HAVE_SIN6_LEN too)
+  AC_DEFINE(HAVE_CONN_LEN)
+fi
+
+AC_CACHE_CHECK(for sockaddr_in6.sin6_len,
+               ac_cv_sockaddr_in6_sin6_len,
+               [AC_TRY_COMPILE([#ifdef HAVE_SYS_TYPES_H
+                                #include <sys/types.h>
+                                #endif
+                                #include <netinet/in.h>
+                                struct sockaddr_in6 x;
+                                void *foo = (void*) &x.sin6_len;],
+                               [],
+                               [ac_cv_sockaddr_in6_sin6_len=true],
+                               [ac_cv_sockaddr_in6_sin6_len=false])])
+if test "$ac_cv_sockaddr_in6_sin6_len" = true ; then
+  AC_DEFINE(HAVE_SIN6_LEN)
+fi
+
 dnl Check whether the compiler supports the new-style C++ standard
 dnl library headers (i.e. <new>) or needs the old "new.h"
 AC_LANG_CPLUSPLUS
 NEW_H=new.h
 MOZ_CHECK_HEADER(new, [NEW_H=new])
 AC_DEFINE_UNQUOTED(NEW_H, <$NEW_H>)
 AC_LANG_C
 
@@ -4188,16 +4222,17 @@ MOZ_SAMPLE_TYPE_FLOAT32=
 MOZ_SAMPLE_TYPE_S16=
 MOZ_MEDIA=
 MOZ_OPUS=1
 MOZ_WEBM=1
 MOZ_DASH=
 MOZ_WEBRTC=1
 MOZ_SRTP=
 MOZ_WEBRTC_SIGNALING=
+MOZ_SCTP=
 MOZ_MEDIA_PLUGINS=
 MOZ_MEDIA_NAVIGATOR=
 MOZ_OMX_PLUGIN=
 MOZ_VP8=
 MOZ_VP8_ERROR_CONCEALMENT=
 MOZ_VP8_ENCODER=
 VPX_AS=
 VPX_ASFLAGS=
@@ -5183,21 +5218,24 @@ MOZ_ARG_DISABLE_BOOL(webrtc,
 
 if test -n "$MOZ_WEBRTC"; then
     AC_DEFINE(MOZ_WEBRTC)
     MOZ_MEDIA=1
     MOZ_RAW=1
     MOZ_VP8=1
     MOZ_VP8_ENCODER=1
     MOZ_VP8_ERROR_CONCEALMENT=1
+    MOZ_SCTP=1
     MOZ_SRTP=1
+    AC_DEFINE(MOZ_SCTP)
     AC_DEFINE(MOZ_SRTP)
 fi
 
 AC_SUBST(MOZ_WEBRTC)
+AC_SUBST(MOZ_SCTP)
 AC_SUBST(MOZ_SRTP)
 
 case "$target_cpu" in
 arm*)
     MOZ_SAMPLE_TYPE_S16=1
     AC_DEFINE(MOZ_SAMPLE_TYPE_S16)
     AC_SUBST(MOZ_SAMPLE_TYPE_S16)
 ;;

--- a/netwerk/Makefile.in
+++ b/netwerk/Makefile.in
@@ -26,16 +26,22 @@ PARALLEL_DIRS = \
   $(NULL)
 
 ifdef MOZ_SRTP
 PARALLEL_DIRS += \
   srtp/src \
   $(NULL)
 endif
 
+ifdef MOZ_SCTP
+PARALLEL_DIRS += \
+  sctp/src \
+  $(NULL)
+endif
+
 ifdef NECKO_WIFI
 PARALLEL_DIRS += wifi
 endif
 
 PARALLEL_DIRS += locales
 
 ifdef MOZ_DASH
 PARALLEL_DIRS += dash

--- a/netwerk/build/Makefile.in
+++ b/netwerk/build/Makefile.in
@@ -37,16 +37,22 @@ SHARED_LIBRARY_LIBS = \
   $(NULL)
 
 ifdef MOZ_SRTP
 SHARED_LIBRARY_LIBS += \
   ../srtp/src/$(LIB_PREFIX)nksrtp_s.$(LIB_SUFFIX) \
   $(NULL)
 endif
 
+ifdef MOZ_SCTP
+SHARED_LIBRARY_LIBS += \
+  ../sctp/src/$(LIB_PREFIX)nksctp_s.$(LIB_SUFFIX) \
+  $(NULL)
+endif
+
 ifeq ($(OS_ARCH),WINNT)
     SHARED_LIBRARY_LIBS += \
         ../system/win32/$(LIB_PREFIX)neckosystem_s.$(LIB_SUFFIX)
 endif
 
 ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
     SHARED_LIBRARY_LIBS += \
         ../system/mac/$(LIB_PREFIX)neckosystem_s.$(LIB_SUFFIX)

new file mode 100644
--- /dev/null
+++ b/netwerk/sctp/src/Makefile.in
@@ -0,0 +1,115 @@
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DEPTH     = ../../..
+topsrcdir = @top_srcdir@
+srcdir    = @srcdir@
+VPATH     = \
+  @srcdir@ \
+  @srcdir@/netinet \
+  @srcdir@/netinet6 \
+  $(NULL)
+
+include $(DEPTH)/config/autoconf.mk
+
+MODULE         = necko
+LIBRARY_NAME   = nksctp_s
+LIBXUL_LIBRARY = 1
+XPIDL_MODULE   = necko_sctp
+GRE_MODULE     = 1
+FORCE_STATIC_LIB = 1
+
+EXPORTS_NAMESPACES = mozilla/net
+
+XPIDLSRCS = \
+  $(NULL)
+
+CSRCS = \
+  user_environment.c \
+  user_mbuf.c \
+  user_recv_thread.c \
+  user_sctp_timer_iterate.c \
+  user_socket.c \
+  sctp_asconf.c \
+  sctp_auth.c \
+  sctp_bsd_addr.c \
+  sctp_callout.c \
+  sctp_cc_functions.c \
+  sctp_crc32.c \
+  sctp_hashdriver.c \
+  sctp_indata.c \
+  sctp_input.c \
+  sctp_output.c \
+  sctp_pcb.c \
+  sctp_peeloff.c \
+  sctp_sha1.c \
+  sctp_ss_functions.c \
+  sctp_sysctl.c \
+  sctp_userspace.c \
+  sctp_timer.c \
+  sctp_usrreq.c \
+  sctputil.c \
+  sctp6_usrreq.c \
+  $(NULL)
+
+EXPORTS_mozilla/net = \
+  usrsctp.h \
+  $(NULL)
+
+LOCAL_INCLUDES = \
+  -I$(srcdir)/../../base/src \
+  -I$(topsrcdir)/content/base/src \
+  -I$(topsrcdir)/content/events/src \
+  -I$(topsrcdir)/xpcom/ds \
+  $(NULL)
+
+DEFINES = \
+  -DSCTP_SIMPLE_ALLOCATOR=1 \
+  -DUSE_SCTP_SHA1=1 \
+  -DSCTP_PROCESS_LEVEL_LOCKS=1 \
+  -D__Userspace__=1 \
+  -DINET=1 \
+  -DINET6=1 \
+  -DCALLBACK_API=1 \
+  -DSCTP_DEBUG=1 \
+  $(NULL)
+
+ifeq ($(OS_TARGET),WINNT)
+DEFINES += \
+  -D__Userspace_os_Windows=1 \
+  -D_LIB=1 \
+  $(NULL)
+else
+ifeq ($(OS_TARGET),Darwin)
+DEFINES += \
+  -D__Userspace_os_Darwin=1 \
+  -D__APPLE_USE_RFC_2292=1 \
+  -U__APPLE__ \
+  $(NULL)
+else
+ifeq ($(OS_TARGET),Linux)
+DEFINES += -D__Userspace_os_Linux=1
+else
+ifeq ($(OS_TARGET),FreeBSD)
+DEFINES += \
+  -D__Userspace_os_FreeBSD=1 \
+  -U__FreeBSD__ \
+  $(NULL)
+else
+#error Unsupported platform!
+endif
+endif
+endif
+endif
+
+include $(topsrcdir)/config/config.mk
+include $(topsrcdir)/ipc/chromium/chromium-config.mk
+include $(topsrcdir)/config/rules.mk
+
+ifdef GNU_CC
+CFLAGS += -std=gnu99
+endif
+
+DEFINES += -DIMPL_NS_NET

new file mode 100644
--- /dev/null
+++ b/netwerk/sctp/src/README.sctp
@@ -0,0 +1,16 @@
+This code is imported from the usrsctp library via netwerk/sctp/update_sctp.sh.
+
+The project is accessed via:
+
+svn co --username your.username https://sctp-refimpl.googlecode.com/svn/trunk sctpSVN
+
+If you just want a read-only copy use
+
+svn co http://sctp-refimpl.googlecode.com/svn/trunk sctpSVN
+
+The usrsctp library is based on the FreeBSD kernel implementation, and the
+userspace implementation was largely done my Michael Tuexen and Irene
+Rungler of the Munster University of Applied Sciences.  Thanks also to
+Randall Stewart for his help.
+
+The library is covered by a BSD license - see headers in files.

new file mode 100755
--- /dev/null
+++ b/netwerk/sctp/update_sctp.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# assume $1 is the directory with a SVN checkout of the libsctp source
+#
+# sctp usrlib source is available (via svn) at:
+# svn co https://sctp-refimpl.googlecode.com/svn/trunk sctpSVN
+#
+# also assumes we've made *NO* changes to the SCTP sources!  If we do, we have to merge by
+# hand after this process, or use a more complex one.
+#
+# For example, one could update an sctp library import head, and merge back to default.  Or keep a
+# separate repo with this in it, and pull from there to m-c and merge.
+if [ "$1" ] ; then
+  export date=`date`
+  export revision=`(cd $1; svnversion -n)`
+
+  cp $1/KERN/usrsctp/usrsctplib/*.c $1/KERN/usrsctp/usrsctplib/*.h netwerk/sctp/src
+  cp $1/KERN/usrsctp/usrsctplib/netinet/*.c $1/KERN/usrsctp/usrsctplib/netinet/*.h netwerk/sctp/src/netinet
+  cp $1/KERN/usrsctp/usrsctplib/netinet6/*.c $1/KERN/usrsctp/usrsctplib/netinet6/*.h netwerk/sctp/src/netinet6
+
+  hg addremove netwerk/sctp/src --include "**.c" --include "**.h" --similarity 90
+
+  echo "sctp updated to version $revision from SVN on $date" >> netwerk/sctp/sctp_update.log
+  echo "sctp updated to version $revision from SVN on $date"
+  echo "WARNING: reapply any local patches!"
+else
+  echo "usage: $0 path_to_sctpSVN_directory"
+  echo "run from the root of your m-c clone"
+fi