Merge branch 'ingela/raimo/udp-send-TOS/ERIERL-294/OTP-15747' into maint-21

* ingela/raimo/udp-send-TOS/ERIERL-294/OTP-15747:
  Introduce udp send ancillary data argument down to inet_drv
  Fix old warnings

12 files changed, 590 insertions, 132 deletions

diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index becc04950e..d6ceab680b 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -3379,6 +3379,71 @@ static int udp_parse_ancillary_data(ErlDrvTermData *spec, int i,
     i = LOAD_NIL(spec, i);
     return LOAD_LIST(spec, i, n+1);
 }
+
+static int compile_ancillary_data(struct msghdr *mhdr,
+                                  char *ptr, ErlDrvSizeT anc_len) {
+    struct cmsghdr *cmsg;
+    size_t controllen = 0;
+    cmsg = CMSG_FIRSTHDR(mhdr);
+    for (;;) {
+        if (anc_len == 0) {
+            /* End of options to compile */
+            mhdr->msg_controllen = controllen;
+            return 0;
+        }
+        if (cmsg == NULL) {
+            /* End of destination before end of options */
+            return 1;
+        }
+
+#define COMPILE_ANCILLARY_DATA_ITEM(Level, Opt, Type, Get, Size)        \
+        do {                                                            \
+            if (anc_len < (Size)) return 1;                             \
+            sys_memset(cmsg, '\0', CMSG_SPACE(sizeof(Type)));           \
+            cmsg->cmsg_level = Level;                                   \
+            cmsg->cmsg_type = Opt;                                      \
+            cmsg->cmsg_len = CMSG_LEN(sizeof(Type));                    \
+            *((Type *) CMSG_DATA(cmsg)) = Get(ptr);                     \
+            controllen += CMSG_SPACE(sizeof(Type));                     \
+            cmsg = CMSG_NXTHDR(mhdr, cmsg);                             \
+            ptr += 4;                                                   \
+            anc_len -= 4;                                               \
+        } while (0)
+#define SIZEOF_ANCILLARY_DATA (2 * CMSG_SPACE(sizeof(int)))
+        /* (IP_TOS | IPV6_TCLASS) + IP_TTL */
+
+        switch (anc_len--, *ptr++) {
+        case INET_OPT_TOS: {
+#if defined(IPPROTO_IP) && defined(IP_TOS)
+            COMPILE_ANCILLARY_DATA_ITEM(IPPROTO_IP, IP_TOS, int, get_int32, 4);
+#else
+            return 1; /* Socket option not implemented */
+#endif
+            break;
+        }
+        case INET_OPT_TTL: {
+#if defined(IPPROTO_IP) && defined(IP_TTL)
+            COMPILE_ANCILLARY_DATA_ITEM(IPPROTO_IP, IP_TTL, int, get_int32, 4);
+#else
+            return 1; /* Socket option not implemented */
+#endif
+            break;
+        }
+        case INET_OPT_TCLASS: {
+#if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS)
+            COMPILE_ANCILLARY_DATA_ITEM(IPPROTO_IPV6, IPV6_TCLASS, int, get_int32, 4);
+#else
+            return 1; /* Socket option not implemented */
+#endif
+            break;
+        }
+        default:
+            /* Unknow socket option */
+            return 1;
+        }
+#undef COMPILE_ANCILLARY_DATA_ITEM
+    }
+}
 #endif /* ifndef __WIN32__ */
 
 /* 
@@ -11384,7 +11449,7 @@ static int tcp_shutdown_error(tcp_descriptor* desc, int err)
 static void tcp_inet_delay_send(ErlDrvData data, ErlDrvTermData dummy)
 {
     tcp_descriptor *desc = (tcp_descriptor*)data;
-    (void)tcp_inet_output(desc, INETP(desc)->s);
+    (void)tcp_inet_output(desc, (HANDLE) INETP(desc)->s);
 }
 
 /*
@@ -12551,7 +12616,7 @@ static void packet_inet_timeout(ErlDrvData e)
 	sock_select(desc, FD_READ, 0);
         async_error_am (desc, am_timeout);
     } else {
-        (void)packet_inet_input(udesc, desc->s);
+        (void)packet_inet_input(udesc, (HANDLE) desc->s);
     }
 }
 
@@ -12595,11 +12660,8 @@ static void packet_inet_command(ErlDrvData e, char* buf, ErlDrvSizeT len)
 	    char ancd[CMSG_SPACE(sizeof(*sri))];
 	} cmsg;
 	
-	if (len < SCTP_GET_SENDPARAMS_LEN) {
-	    inet_reply_error(desc, EINVAL);
-	    return;
-	}
-	
+	if (len < SCTP_GET_SENDPARAMS_LEN) goto return_einval;
+
 	/* The ancillary data */
 	sri = (struct sctp_sndrcvinfo *) (CMSG_DATA(&cmsg.hdr));
 	/* Get the "sndrcvinfo" from the buffer, advancing the "ptr": */
@@ -12632,28 +12694,85 @@ static void packet_inet_command(ErlDrvData e, char* buf, ErlDrvSizeT len)
 	goto check_result_code;
     }
 #endif
-    /* UDP socket. Even if it is connected, there is an address prefix
-       here -- ignored for connected sockets: */
-    sz = len;
-    qtr = ptr;
-    xerror = inet_set_faddress(desc->sfamily, &other, &qtr, &sz);
-    if (xerror != NULL) {
-        inet_reply_error_am(desc, driver_mk_atom(xerror));
-	return;
-    }
-    len -= (qtr - ptr);
-    ptr = qtr;
-    /* Now "ptr" is the user data ptr, "len" is data length: */
-    inet_output_count(desc, len);
-    
-    if (desc->state & INET_F_ACTIVE) { /* connected (ignore address) */
-	code = sock_send(desc->s, ptr, len, 0);
-    }
-    else {
-	code = sock_sendto(desc->s, ptr, len, 0, &other.sa, sz);
+    {
+        ErlDrvSizeT anc_len;
+        
+        /* UDP socket. Even if it is connected, there is an address prefix
+           here -- ignored for connected sockets: */
+        sz = len;
+        qtr = ptr;
+        xerror = inet_set_faddress(desc->sfamily, &other, &qtr, &sz);
+        if (xerror != NULL) {
+            inet_reply_error_am(desc, driver_mk_atom(xerror));
+            return;
+        }
+        len -= (qtr - ptr);
+        ptr = qtr;
+
+        /* Here comes ancillary data */
+        if (len < 4) goto return_einval;
+        anc_len = get_int32(ptr);
+        len -= 4; ptr += 4;
+        if (len < anc_len) goto return_einval;
+
+        if (anc_len == 0 && !!0/*XXX-short-circuit-for-testing*/) {
+            /* Empty ancillary data */
+            /* Now "ptr" is the user data ptr, "len" is data length: */
+            inet_output_count(desc, len);
+            if (desc->state & INET_F_ACTIVE) {
+                /* connected (ignore address) */
+                code = sock_send(desc->s, ptr, len, 0);
+            }
+            else {
+                code = sock_sendto(desc->s, ptr, len, 0, &other.sa, sz);
+            }
+        }
+        else {
+#ifdef __WIN32__
+            goto return_einval; /* Can not send ancillary data on Windows */
+#else
+            struct iovec iov[1];
+            struct msghdr mhdr;
+            union { /* For ancillary data         */
+                struct cmsghdr hdr;
+                char ancd[SIZEOF_ANCILLARY_DATA];
+            } cmsg;
+            sys_memset(&iov, '\0', sizeof(iov));
+            sys_memset(&mhdr, '\0', sizeof(mhdr));
+            sys_memset(&cmsg, '\0', sizeof(cmsg));
+            if (desc->state & INET_F_ACTIVE) {
+                /* connected (ignore address) */
+                mhdr.msg_name = NULL;
+                mhdr.msg_namelen = 0;
+            }
+            else {
+                mhdr.msg_name = &other;
+                mhdr.msg_namelen = sz;
+            }
+            mhdr.msg_control = cmsg.ancd;
+            mhdr.msg_controllen = sizeof(cmsg.ancd);
+            if (compile_ancillary_data(&mhdr, ptr, anc_len) != 0) {
+                goto return_einval;
+            }
+            if (mhdr.msg_controllen == 0) {
+                /* XXX Testing - only possible for anc_len == 0 */
+                mhdr.msg_control = NULL;
+            }
+            len -= anc_len;
+            ptr += anc_len;
+            /* Now "ptr" is the user data ptr, "len" is data length: */
+            iov[0].iov_len = len;
+            iov[0].iov_base = ptr;
+            mhdr.msg_iov = iov;
+            mhdr.msg_iovlen = 1;
+            mhdr.msg_flags = 0;
+            inet_output_count(desc, len);
+            code = sock_sendmsg(desc->s, &mhdr, 0);
+#endif
+        }
     }
 
-#ifdef HAVE_SCTP    
+#ifdef HAVE_SCTP
  check_result_code:
     /* "code" analysis is the same for both SCTP and UDP cases above: */
 #endif
@@ -12663,8 +12782,15 @@ static void packet_inet_command(ErlDrvData e, char* buf, ErlDrvSizeT len)
     }
     else
 	inet_reply_ok(desc);
+    return;
+    
+ return_einval:
+    inet_reply_error(desc, EINVAL);
+    return;
 }
-#endif
+
+#endif /* HAVE_UDP */
+
 
 #ifdef __WIN32__
 static void packet_inet_event(ErlDrvData e, ErlDrvEvent event)
diff --git a/erts/preloaded/ebin/prim_inet.beam b/erts/preloaded/ebin/prim_inet.beam
index d3614d5f16..8833f9c77c 100644
--- a/erts/preloaded/ebin/prim_inet.beam
+++ b/erts/preloaded/ebin/prim_inet.beam
diff --git a/erts/preloaded/src/prim_inet.erl b/erts/preloaded/src/prim_inet.erl
index 2820a5bef4..77d4292ad0 100644
--- a/erts/preloaded/src/prim_inet.erl
+++ b/erts/preloaded/src/prim_inet.erl
@@ -553,34 +553,49 @@ send(S, Data) ->
 %% "sendto" is for UDP. IP and Port are set by the caller to 0 if the socket
 %% is known to be connected.
 
-sendto(S, Addr, _, Data) when is_port(S), tuple_size(Addr) =:= 2 ->
-    case type_value(set, addr, Addr) of
-	true ->
-	    ?DBG_FORMAT("prim_inet:sendto(~p, ~p, ~p)~n", [S,Addr,Data]),
-	    try
-		erlang:port_command(S, [enc_value(set, addr, Addr),Data])
-	    of
-		true ->
-		    receive
-			{inet_reply,S,Reply} ->
-			    ?DBG_FORMAT(
-			       "prim_inet:sendto() -> ~p~n", [Reply]),
-			    Reply
-		    end
-	    catch
-		error:_ ->
-		    ?DBG_FORMAT(
-		       "prim_inet:sendto() -> {error,einval}~n", []),
-		    {error,einval}
-	    end;
-	false ->
-	    ?DBG_FORMAT(
-	       "prim_inet:sendto() -> {error,einval}~n", []),
-	    {error,einval}
-    end;
-sendto(S, IP, Port, Data) ->
-    sendto(S, {IP, Port}, 0, Data).
-
+sendto(S, {_, _} = Address, AncOpts, Data)
+  when is_port(S), is_list(AncOpts) ->
+    case encode_opt_val(AncOpts) of
+        {ok, AncData} ->
+            AncDataLen = iolist_size(AncData),
+            case
+                type_value(set, addr, Address) andalso
+                type_value(set, uint32, AncDataLen)
+            of
+                true ->
+                    ?DBG_FORMAT("prim_inet:sendto(~p, ~p, ~p, ~p)~n",
+                                [S,Address,AncOpts,Data]),
+                    PortCommandData =
+                        [enc_value(set, addr, Address),
+                         enc_value(set, uint32, AncDataLen), AncData,
+                         Data],
+                    try erlang:port_command(S, PortCommandData) of
+                        true ->
+                            receive
+                                {inet_reply,S,Reply} ->
+                                    ?DBG_FORMAT(
+                                       "prim_inet:sendto() -> ~p~n", [Reply]),
+                                    Reply
+                            end
+                    catch
+                        _:_ ->
+                            ?DBG_FORMAT(
+                               "prim_inet:sendto() -> {error,einval}~n", []),
+                            {error,einval}
+                    end;
+                false ->
+                    ?DBG_FORMAT(
+                       "prim_inet:sendto() -> {error,einval}~n", []),
+                    {error,einval}
+            end;
+        {error,_} ->
+            ?DBG_FORMAT(
+               "prim_inet:sendto() -> {error,einval}~n", []),
+            {error,einval}
+    end;                        
+sendto(S, IP, Port, Data)
+  when is_port(S), is_integer(Port) ->
+    sendto(S, {IP, Port}, [], Data).
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%
@@ -1993,15 +2008,15 @@ enc_value_2(addr, {File,_}) when is_list(File); is_binary(File) ->
     [?INET_AF_LOCAL,iolist_size(File)|File];
 %%
 enc_value_2(addr, {inet,{any,Port}}) ->
-    [?INET_AF_INET,?int16(Port),0,0,0,0];
+    [?INET_AF_INET,?int16(Port)|ip4_to_bytes({0,0,0,0})];
 enc_value_2(addr, {inet,{loopback,Port}}) ->
-    [?INET_AF_INET,?int16(Port),127,0,0,1];
+    [?INET_AF_INET,?int16(Port)|ip4_to_bytes({127,0,0,1})];
 enc_value_2(addr, {inet,{IP,Port}}) ->
     [?INET_AF_INET,?int16(Port)|ip4_to_bytes(IP)];
 enc_value_2(addr, {inet6,{any,Port}}) ->
-    [?INET_AF_INET6,?int16(Port),0,0,0,0,0,0,0,0];
+    [?INET_AF_INET6,?int16(Port)|ip6_to_bytes({0,0,0,0,0,0,0,0})];
 enc_value_2(addr, {inet6,{loopback,Port}}) ->
-    [?INET_AF_INET6,?int16(Port),0,0,0,0,0,0,0,1];
+    [?INET_AF_INET6,?int16(Port)|ip6_to_bytes({0,0,0,0,0,0,0,1})];
 enc_value_2(addr, {inet6,{IP,Port}}) ->
     [?INET_AF_INET6,?int16(Port)|ip6_to_bytes(IP)];
 enc_value_2(addr, {local,Addr}) ->
@@ -2149,10 +2164,10 @@ enum_name(_, []) -> false.
 %% encode opt/val REVERSED since options are stored in reverse order
 %% i.e. the recent options first (we must process old -> new)
 encode_opt_val(Opts) -> 
-    try 
-	enc_opt_val(Opts, [])
+    try
+	{ok, enc_opt_val(Opts, [])}
     catch
-	Reason -> {error,Reason}
+	throw:Reason -> {error,Reason}
     end.
 
 %% {active, once} and {active, N} are specially optimized because they will
@@ -2171,17 +2186,21 @@ enc_opt_val([binary|Opts], Acc) ->
     enc_opt_val(Opts, Acc, mode, binary);
 enc_opt_val([list|Opts], Acc) ->
     enc_opt_val(Opts, Acc, mode, list);
-enc_opt_val([_|_], _) -> {error,einval};
-enc_opt_val([], Acc)  -> {ok,Acc}.
+enc_opt_val([_|_], _) ->
+    throw(einval);
+enc_opt_val([], Acc) ->
+    Acc.
 
 enc_opt_val(Opts, Acc, Opt, Val) when is_atom(Opt) ->
     Type = type_opt(set, Opt),
     case type_value(set, Type, Val) of
 	true -> 
 	    enc_opt_val(Opts, [enc_opt(Opt),enc_value(set, Type, Val)|Acc]);
-	false -> {error,einval}
+	false ->
+            throw(einval)
     end;
-enc_opt_val(_, _, _, _) -> {error,einval}.
+enc_opt_val(_, _, _, _) ->
+    throw(einval).
 
 
 
diff --git a/lib/kernel/doc/src/gen_udp.xml b/lib/kernel/doc/src/gen_udp.xml
index d20fc1fdfd..6c0d072fed 100644
--- a/lib/kernel/doc/src/gen_udp.xml
+++ b/lib/kernel/doc/src/gen_udp.xml
@@ -213,12 +213,93 @@
     </func>
 
     <func>
-      <name name="send" arity="4" since=""/>
+      <name name="send" arity="3" since="OTP @OTP-15747@"/>
       <fsummary>Send a packet.</fsummary>
       <desc>
         <p>
-	  Sends a packet to the specified address and port. Argument
-          <c><anno>Address</anno></c> can be a hostname or a socket address.
+	  Sends a packet to the specified <c><anno>Destination</anno></c>.
+	</p>
+	<p>
+	  This function is equivalent to
+	  <seealso marker="#send-4-AncData"><c>send(<anno>Socket</anno>, <anno>Destination</anno>, [], <anno>Packet</anno>)</c></seealso>.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="send" arity="4" clause_i="1" since=""/>
+      <fsummary>Send a packet.</fsummary>
+      <desc>
+        <p>
+	  Sends a packet to the specified <c><anno>Host</anno></c>
+	  and <c><anno>Port</anno></c>.
+	</p>
+	<p>
+	  This clause is equivalent to
+	  <seealso marker="#send/5"><c>send(<anno>Socket</anno>, <anno>Host</anno>, <anno>Port</anno>, [], <anno>Packet</anno>)</c></seealso>.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="send" arity="4" clause_i="2" anchor="send-4-AncData" since="OTP @OTP-15747@"/>
+      <fsummary>Send a packet.</fsummary>
+      <desc>
+        <p>
+	  Sends a packet to the specified <c><anno>Destination</anno></c>
+	  with ancillary data <c><anno>AncData</anno></c>.
+	</p>
+	<note>
+	  <p>
+	    The ancillary data <c><anno>AncData</anno></c>
+	    contains options that for this single message
+	    override the default options for the socket,
+	    an operation that may not be supported on all platforms,
+	    and if so return <c>{error, einval}</c>.
+	    Using more than one of an ancillary data item type
+	    may also not be supported.
+	    <c><anno>AncData</anno> =:= []</c> is always supported.
+	  </p>
+	</note>
+      </desc>
+    </func>
+
+    <func>
+      <name name="send" arity="4" clause_i="3" since="OTP @OTP-15747@"/>
+      <fsummary>Send a packet.</fsummary>
+      <desc>
+        <p>
+	  Sends a packet to the specified <c><anno>Destination</anno></c>.
+	  Since <c><anno>Destination</anno></c> is complete,
+	  <c><anno>PortZero</anno></c> is redundant and has to be <c>0</c>.
+	</p>
+	<p>
+	  This is a legacy clause mostly for
+	  <c><anno>Destination</anno> = {local, Binary}</c>
+	  where <c><anno>PortZero</anno></c> is superfluous.
+	  It is equivalent to
+	  <seealso marker="#send-4-AncData"><c>send(<anno>Socket</anno>, <anno>Destination</anno>, [], <anno>Packet</anno>)</c></seealso>, the clause right above here.
+	</p>
+      </desc>
+    </func>
+
+    <func>
+      <name name="send" arity="5" since="OTP @OTP-15747@"/>
+      <fsummary>Send a packet.</fsummary>
+      <desc>
+        <p>
+	  Sends a packet to the specified <c><anno>Host</anno></c>
+	  and <c><anno>Port</anno></c>,
+	  with ancillary data <c><anno>AncData</anno></c>.
+	</p>
+	<p>
+	  Argument <c><anno>Host</anno></c> can be
+	  a hostname or a socket address,
+	  and <c><anno>Port</anno></c> can be a port number
+	  or a service name atom.
+	  These are resolved into a <c>Destination</c> and after that
+	  this function is equivalent to
+	  <seealso marker="#send-4-AncData"><c>send(<anno>Socket</anno>, Destination, <anno>AncData</anno>, <anno>Packet</anno>)</c></seealso>, read there about ancillary data.
 	</p>
       </desc>
     </func>
diff --git a/lib/kernel/doc/src/inet.xml b/lib/kernel/doc/src/inet.xml
index 5e33bbc3ff..adaa2684d8 100644
--- a/lib/kernel/doc/src/inet.xml
+++ b/lib/kernel/doc/src/inet.xml
@@ -118,6 +118,42 @@ fe80::204:acff:fe17:bf38
       <name name="port_number"/>
     </datatype>
     <datatype>
+      <name name="family_address" since="OTP @OTP-15747@"/>
+      <desc>
+	<p>
+	  A general address format on the form <c>{Family, Destination}</c>
+	  where <c>Family</c> is an atom such as <c>local</c>
+	  and the format of <c>Destination</c> depends on <c>Family</c>,
+	  and is a complete address
+	  (for example an IP address including port number).
+	</p>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="inet_address" since="OTP @OTP-15747@"/>
+      <desc>
+	<warning>
+	  <p>
+	    This address format is for now experimental
+	    and for completeness to make all address families have a
+	    <c>{Family, Destination}</c> representation.
+	  </p>
+	</warning>
+      </desc>
+    </datatype>
+    <datatype>
+      <name name="inet6_address" since="OTP @OTP-15747@"/>
+      <desc>
+	<warning>
+	  <p>
+	    This address format is for now experimental
+	    and for completeness to make all address families have a
+	    <c>{Family, Destination}</c> representation.
+	  </p>
+	</warning>
+      </desc>
+    </datatype>
+    <datatype>
       <name name="local_address"/>
       <desc>
 	<p>
@@ -180,12 +216,16 @@ fe80::204:acff:fe17:bf38
       <name name="ancillary_data"/>
       <desc>
 	<p>
-	  Ancillary data received with the data packet
-	  or read with the socket option
+	  Ancillary data received with the data packet,
+	  read with the socket option
 	  <seealso marker="gen_tcp#type-pktoptions_value">
 	    <c>pktoptions</c>
 	  </seealso>
-	  from a TCP socket.
+	  from a TCP socket,
+	  or to set in a call to
+	  <seealso marker="gen_udp#send-4-AncData"><c>gen_udp:send/4</c></seealso>
+	  or
+	  <seealso marker="gen_udp#send/5"><c>gen_udp:send/5</c></seealso>.
 	</p>
 	<p>
 	  The value(s) correspond to the currently active socket
@@ -193,7 +233,9 @@ fe80::204:acff:fe17:bf38
 	  <seealso marker="inet#option-recvtos"><c>recvtos</c></seealso>,
 	  <seealso marker="inet#option-recvtclass"><c>recvtclass</c></seealso>
 	  and
-	  <seealso marker="inet#option-recvttl"><c>recvttl</c></seealso>.
+	  <seealso marker="inet#option-recvttl"><c>recvttl</c></seealso>,
+	  or for a single send operation the option(s) to override
+	  the currently active socket option(s).
 	</p>
       </desc>
     </datatype>
diff --git a/lib/kernel/src/gen_udp.erl b/lib/kernel/src/gen_udp.erl
index d6e8652e77..247ebc50f3 100644
--- a/lib/kernel/src/gen_udp.erl
+++ b/lib/kernel/src/gen_udp.erl
@@ -20,7 +20,7 @@
 -module(gen_udp).
 
 -export([open/1, open/2, close/1]).
--export([send/2, send/4, recv/2, recv/3, connect/3]).
+-export([send/2, send/3, send/4, send/5, recv/2, recv/3, connect/3]).
 -export([controlling_process/2]).
 -export([fdopen/2]).
 
@@ -125,20 +125,80 @@ open(Port, Opts0) ->
 close(S) ->
     inet:udp_close(S).
 
--spec send(Socket, Address, Port, Packet) -> ok | {error, Reason} when
+-spec send(Socket, Destination, Packet) -> ok | {error, Reason} when
       Socket :: socket(),
-      Address :: inet:socket_address() | inet:hostname(),
-      Port :: inet:port_number(),
+      Destination :: {inet:ip_address(), inet:port_number()} |
+                     inet:family_address(),
+      Packet :: iodata(),
+      Reason :: not_owner | inet:posix().
+%%%
+send(Socket, Destination, Packet) ->
+    send(Socket, Destination, [], Packet).
+
+-spec send(Socket, Host, Port, Packet) -> ok | {error, Reason} when
+      Socket :: socket(),
+      Host :: inet:hostname() | inet:ip_address(),
+      Port :: inet:port_number() | atom(),
+      Packet :: iodata(),
+      Reason :: not_owner | inet:posix();
+%%%
+          (Socket, Destination, AncData, Packet) -> ok | {error, Reason} when
+      Socket :: socket(),
+      Destination :: {inet:ip_address(), inet:port_number()} |
+                     inet:family_address(),
+      AncData :: inet:ancillary_data(),
+      Packet :: iodata(),
+      Reason :: not_owner | inet:posix();
+%%%
+          (Socket, Destination, PortZero, Packet) -> ok | {error, Reason} when
+      Socket :: socket(),
+      Destination :: {inet:ip_address(), inet:port_number()} |
+                     inet:family_address(),
+      PortZero :: inet:port_number(),
       Packet :: iodata(),
       Reason :: not_owner | inet:posix().
+%%%
+send(S, {_,_} = Destination, PortZero = AncData, Packet) when is_port(S) ->
+    %% Destination is {Family,Addr} | {IP,Port},
+    %% so it is complete - argument PortZero is redundant
+    if
+        PortZero =:= 0 ->
+            case inet_db:lookup_socket(S) of
+                {ok, Mod} ->
+                    Mod:send(S, Destination, [], Packet);
+                Error ->
+                    Error
+            end;
+        is_integer(PortZero) ->
+            %% Redundant PortZero; must be 0
+            {error, einval};
+        is_list(AncData) ->
+            case inet_db:lookup_socket(S) of
+                {ok, Mod} ->
+                    Mod:send(S, Destination, AncData, Packet);
+                Error ->
+                    Error
+            end
+    end;
+send(S, Host, Port, Packet) when is_port(S) ->
+    send(S, Host, Port, [], Packet).
 
-send(S, Address, Port, Packet) when is_port(S) ->
+-spec send(Socket, Host, Port, AncData, Packet) -> ok | {error, Reason} when
+      Socket :: socket(),
+      Host :: inet:hostname() | inet:ip_address() | inet:local_address(),
+      Port :: inet:port_number() | atom(),
+      AncData :: inet:ancillary_data(),
+      Packet :: iodata(),
+      Reason :: not_owner | inet:posix().
+%%%
+send(S, Host, Port, AncData, Packet)
+  when is_port(S), is_list(AncData) ->
     case inet_db:lookup_socket(S) of
 	{ok, Mod} ->
-	    case Mod:getaddr(Address) of
+	    case Mod:getaddr(Host) of
 		{ok,IP} ->
 		    case Mod:getserv(Port) of
-			{ok,UP} -> Mod:send(S, IP, UP, Packet);
+			{ok,P} -> Mod:send(S, {IP,P}, AncData, Packet);
 			{error,einval} -> exit(badarg);
 			Error -> Error
 		    end;
@@ -149,6 +209,7 @@ send(S, Address, Port, Packet) when is_port(S) ->
 	    Error
     end.
 
+%% Connected send
 send(S, Packet) when is_port(S) ->
     case inet_db:lookup_socket(S) of
 	{ok, Mod} ->
diff --git a/lib/kernel/src/inet.erl b/lib/kernel/src/inet.erl
index 9f22eb6aaa..7940903658 100644
--- a/lib/kernel/src/inet.erl
+++ b/lib/kernel/src/inet.erl
@@ -75,7 +75,8 @@
 
 -export_type([address_family/0, socket_protocol/0, hostent/0, hostname/0, ip4_address/0,
               ip6_address/0, ip_address/0, port_number/0,
-	      local_address/0, socket_address/0, returned_non_ip_address/0,
+	      family_address/0, local_address/0,
+              socket_address/0, returned_non_ip_address/0,
 	      socket_setopt/0, socket_getopt/0, ancillary_data/0,
 	      posix/0, socket/0, stat_option/0]).
 %% imports
@@ -100,11 +101,16 @@
 			0..65535,0..65535,0..65535,0..65535}.
 -type ip_address() :: ip4_address() | ip6_address().
 -type port_number() :: 0..65535.
--type local_address() :: {local, File :: binary() | string()}.
+-type family_address() :: inet_address() | inet6_address() | local_address().
+-type inet_address() ::
+        {'inet', {ip4_address() | 'any' | 'loopback', port_number()}}.
+-type inet6_address() ::
+        {'inet6', {ip6_address() | 'any' | 'loopback', port_number()}}.
+-type local_address() :: {'local', File :: binary() | string()}.
 -type returned_non_ip_address() ::
-	{local, binary()} |
-	{unspec, <<>>} |
-	{undefined, any()}.
+	{'local', binary()} |
+	{'unspec', <<>>} |
+	{'undefined', any()}.
 -type posix() ::
         'eaddrinuse' | 'eaddrnotavail' | 'eafnosupport' | 'ealready' |
         'econnaborted' | 'econnrefused' | 'econnreset' |
diff --git a/lib/kernel/src/inet6_udp.erl b/lib/kernel/src/inet6_udp.erl
index 71db0357cd..cb95a69798 100644
--- a/lib/kernel/src/inet6_udp.erl
+++ b/lib/kernel/src/inet6_udp.erl
@@ -65,16 +65,25 @@ open(Port, Opts) ->
 	{ok, _} -> exit(badarg)
     end.
 
-send(S, Addr = {A,B,C,D,E,F,G,H}, P, Data)
-  when ?ip6(A,B,C,D,E,F,G,H), ?port(P) ->
-    prim_inet:sendto(S, Addr, P, Data).
+send(S, {A,B,C,D,E,F,G,H} = IP, Port, Data)
+  when ?ip6(A,B,C,D,E,F,G,H), ?port(Port) ->
+    prim_inet:sendto(S, {IP, Port}, [], Data);
+send(S, {{A,B,C,D,E,F,G,H}, Port} = Addr, AncData, Data)
+  when ?ip6(A,B,C,D,E,F,G,H), ?port(Port), is_list(AncData) ->
+    prim_inet:sendto(S, Addr, AncData, Data);
+send(S, {?FAMILY, {{A,B,C,D,E,F,G,H}, Port}} = Address, AncData, Data)
+  when ?ip6(A,B,C,D,E,F,G,H), ?port(Port), is_list(AncData) ->
+    prim_inet:sendto(S, Address, AncData, Data);
+send(S, {?FAMILY, {loopback, Port}} = Address, AncData, Data)
+  when ?port(Port), is_list(AncData) ->
+    prim_inet:sendto(S, Address, AncData, Data).
 
 send(S, Data) ->
-    prim_inet:sendto(S, {0,0,0,0,0,0,0,0}, 0, Data).
+    prim_inet:sendto(S, {any, 0}, [], Data).
     
-connect(S, Addr = {A,B,C,D,E,F,G,H}, P) 
-  when ?ip6(A,B,C,D,E,F,G,H), ?port(P) ->
-    prim_inet:connect(S, Addr, P).
+connect(S, Addr = {A,B,C,D,E,F,G,H}, Port) 
+  when ?ip6(A,B,C,D,E,F,G,H), ?port(Port) ->
+    prim_inet:connect(S, Addr, Port).
 
 recv(S, Len) ->
     prim_inet:recvfrom(S, Len).
diff --git a/lib/kernel/src/inet_udp.erl b/lib/kernel/src/inet_udp.erl
index 1e624b9e90..083059a2dc 100644
--- a/lib/kernel/src/inet_udp.erl
+++ b/lib/kernel/src/inet_udp.erl
@@ -66,16 +66,25 @@ open(Port, Opts) ->
 	{ok, _} -> exit(badarg)
     end.
 
-send(S, {A,B,C,D} = Addr, P, Data)
-  when ?ip(A,B,C,D), ?port(P) ->
-    prim_inet:sendto(S, Addr, P, Data).
+send(S, {A,B,C,D} = IP, Port, Data)
+  when ?ip(A,B,C,D), ?port(Port) ->
+    prim_inet:sendto(S, {IP, Port}, [], Data);
+send(S, {{A,B,C,D}, Port} = Addr, AncData, Data)
+  when ?ip(A,B,C,D), ?port(Port), is_list(AncData) ->
+    prim_inet:sendto(S, Addr, AncData, Data);
+send(S, {?FAMILY, {{A,B,C,D}, Port}} = Address, AncData, Data)
+  when ?ip(A,B,C,D), ?port(Port), is_list(AncData) ->
+    prim_inet:sendto(S, Address, AncData, Data);
+send(S, {?FAMILY, {loopback, Port}} = Address, AncData, Data)
+  when ?port(Port), is_list(AncData) ->
+    prim_inet:sendto(S, Address, AncData, Data).
 
 send(S, Data) ->
-    prim_inet:sendto(S, {0,0,0,0}, 0, Data).
+    prim_inet:sendto(S, {any, 0}, [], Data).
     
-connect(S, Addr = {A,B,C,D}, P)
-  when ?ip(A,B,C,D), ?port(P) ->
-    prim_inet:connect(S, Addr, P).
+connect(S, Addr = {A,B,C,D}, Port)
+  when ?ip(A,B,C,D), ?port(Port) ->
+    prim_inet:connect(S, Addr, Port).
 
 recv(S, Len) ->
     prim_inet:recvfrom(S, Len).
diff --git a/lib/kernel/src/local_udp.erl b/lib/kernel/src/local_udp.erl
index 481a8c4910..933e56228b 100644
--- a/lib/kernel/src/local_udp.erl
+++ b/lib/kernel/src/local_udp.erl
@@ -70,11 +70,13 @@ open(0, Opts) ->
 	{ok, _} -> exit(badarg)
     end.
 
-send(S, Addr = {?FAMILY,_}, 0, Data) ->
-    prim_inet:sendto(S, Addr, 0, Data).
+send(S, {?FAMILY,_} = Addr, 0, Data) ->
+    prim_inet:sendto(S, Addr, [], Data);
+send(S, {?FAMILY,_} = Addr, AncData, Data) when is_list(AncData) ->
+    prim_inet:sendto(S, Addr, AncData, Data).
 %%
 send(S, Data) ->
-    prim_inet:sendto(S, {?FAMILY,<<>>}, 0, Data).
+    prim_inet:sendto(S, {?FAMILY,<<>>}, [], Data).
 
 connect(S, Addr = {?FAMILY,_}, 0) ->
     prim_inet:connect(S, Addr, 0).
diff --git a/lib/kernel/test/gen_tcp_misc_SUITE.erl b/lib/kernel/test/gen_tcp_misc_SUITE.erl
index 4a17827913..1ff30012e1 100644
--- a/lib/kernel/test/gen_tcp_misc_SUITE.erl
+++ b/lib/kernel/test/gen_tcp_misc_SUITE.erl
@@ -2021,7 +2021,7 @@ recvtclass(_Config) ->
 recvtos_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,4,0});
 recvtos_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {19,0,0});
 %% Using the option returns einval, so it is not implemented.
-recvtos_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {11,2,0});
+recvtos_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,1,0});
 recvtos_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
 %% Does not return any value - not implemented for pktoptions
 recvtos_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {3,1,0});
@@ -2033,7 +2033,7 @@ recvtos_ok(_, _) -> false.
 recvttl_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,4,0});
 recvttl_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {19,0,0});
 %% Using the option returns einval, so it is not implemented.
-recvttl_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {11,2,0});
+recvttl_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,1,0});
 recvttl_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
 %% Does not return any value - not implemented for pktoptions
 recvttl_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {2,7,0});
@@ -2046,7 +2046,7 @@ recvtclass_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,4,0});
 recvtclass_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {19,0,0});
 recvtclass_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
 %% Using the option returns einval, so it is not implemented.
-recvtclass_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {11,2,0});
+recvtclass_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,1,0});
 %% Does not return any value - not implemented for pktoptions
 recvtclass_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {3,1,0});
 %%
diff --git a/lib/kernel/test/gen_udp_SUITE.erl b/lib/kernel/test/gen_udp_SUITE.erl
index af9985de45..730886865c 100644
--- a/lib/kernel/test/gen_udp_SUITE.erl
+++ b/lib/kernel/test/gen_udp_SUITE.erl
@@ -37,6 +37,7 @@
 	 buffer_size/1, binary_passive_recv/1, max_buffer_size/1, bad_address/1,
 	 read_packets/1, open_fd/1, connect/1, implicit_inet6/1,
          recvtos/1, recvtosttl/1, recvttl/1, recvtclass/1,
+         sendtos/1, sendtosttl/1, sendttl/1, sendtclass/1,
 	 local_basic/1, local_unbound/1,
 	 local_fdopen/1, local_fdopen_unbound/1, local_abstract/1]).
 
@@ -49,6 +50,7 @@ all() ->
      bad_address, read_packets, open_fd, connect,
      implicit_inet6, active_n,
      recvtos, recvtosttl, recvttl, recvtclass,
+     sendtos, sendtosttl, sendttl, sendtclass,
      {group, local}].
 
 groups() -> 
@@ -312,7 +314,6 @@ read_packets(Config) when is_list(Config) ->
     {ok,R} = gen_udp:open(0, [{read_packets,N1}]),
     {ok,RP} = inet:port(R),
     {ok,Node} = start_node(gen_udp_SUITE_read_packets),
-    Die = make_ref(),
     %%
     {V1, Trace1} = read_packets_test(R, RP, Msgs, Node),
     {ok,[{read_packets,N1}]} = inet:getopts(R, [read_packets]),
@@ -324,7 +325,7 @@ read_packets(Config) when is_list(Config) ->
     stop_node(Node),
     ct:log("N1=~p, V1=~p vs N2=~p, V2=~p",[N1,V1,N2,V2]),
 
-    dump_terms(Config, "trace1.terms", Trace2),
+    dump_terms(Config, "trace1.terms", Trace1),
     dump_terms(Config, "trace2.terms", Trace2),
 
     %% Because of the inherit racy-ness of the feature it is
@@ -348,15 +349,6 @@ dump_terms(Config, Name, Terms) ->
     file:write_file(FName, term_to_binary(Terms)),
     ct:log("Logged terms to ~s",[FName]).
 
-infinite_loop(Die) ->
-    receive 
-	Die ->
-	    ok
-    after
-	0 ->
-	    infinite_loop(Die)
-    end.
-
 read_packets_test(R, RP, Msgs, Node) ->
     Receiver = self(),
     Tracer =
@@ -577,19 +569,19 @@ active_n(Config) when is_list(Config) ->
 
 recvtos(_Config) ->
     test_recv_opts(
-      inet, [{recvtos,tos,96}],
+      inet, [{recvtos,tos,96}], false,
       fun recvtos_ok/2).
 
 recvtosttl(_Config) ->
     test_recv_opts(
-      inet, [{recvtos,tos,96},{recvttl,ttl,33}],
+      inet, [{recvtos,tos,96},{recvttl,ttl,33}], false,
       fun (OSType, OSVer) ->
               recvtos_ok(OSType, OSVer) andalso recvttl_ok(OSType, OSVer)
       end).
 
 recvttl(_Config) ->
     test_recv_opts(
-      inet, [{recvttl,ttl,33}],
+      inet, [{recvttl,ttl,33}], false,
       fun recvttl_ok/2).
 
 recvtclass(_Config) ->
@@ -601,15 +593,48 @@ recvtclass(_Config) ->
     of
         [_] ->
             test_recv_opts(
-              inet6, [{recvtclass,tclass,224}],
+              inet6, [{recvtclass,tclass,224}], false,
               fun recvtclass_ok/2);
         [] ->
             {skip,ipv6_not_supported,IFs}
     end.
 
+
+sendtos(_Config) ->
+    test_recv_opts(
+      inet, [{recvtos,tos,96}], true,
+      fun sendtos_ok/2).
+
+sendtosttl(_Config) ->
+    test_recv_opts(
+      inet, [{recvtos,tos,96},{recvttl,ttl,33}], true,
+      fun (OSType, OSVer) ->
+              sendtos_ok(OSType, OSVer) andalso sendttl_ok(OSType, OSVer)
+      end).
+
+sendttl(_Config) ->
+    test_recv_opts(
+      inet, [{recvttl,ttl,33}], true,
+      fun sendttl_ok/2).
+
+sendtclass(_Config) ->
+    {ok,IFs} = inet:getifaddrs(),
+    case
+        [Name ||
+            {Name,Opts} <- IFs,
+            lists:member({addr,{0,0,0,0,0,0,0,1}}, Opts)]
+    of
+        [_] ->
+            test_recv_opts(
+              inet6, [{recvtclass,tclass,224}], true,
+              fun sendtclass_ok/2);
+        [] ->
+            {skip,ipv6_not_supported,IFs}
+    end.
+
 %% These version numbers are just above the highest noted in daily tests
 %% where the test fails for a plausible reason, that is the lowest
-%% where we can expect that the test mighe succeed, so
+%% where we can expect that the test might succeed, so
 %% skip on platforms lower than this.
 %%
 %% On newer versions it might be fixed, but we'll see about that
@@ -628,16 +653,55 @@ recvtos_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
 recvtos_ok({unix,_}, _) -> true;
 recvtos_ok(_, _) -> false.
 
+%% Option has no effect
+recvttl_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
+%%
 recvttl_ok({unix,_}, _) -> true;
 recvttl_ok(_, _) -> false.
 
 %% Using the option returns einval, so it is not implemented.
 recvtclass_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {9,9,0});
 recvtclass_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {2,6,11});
+%% Option has no effect
+recvtclass_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
 %%
 recvtclass_ok({unix,_}, _) -> true;
 recvtclass_ok(_, _) -> false.
 
+
+%% To send ancillary data seems to require much higher version numbers
+%% than receiving it...
+%%
+
+%% Using the option returns einval, so it is not implemented.
+sendtos_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {19,0,0});
+sendtos_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,5,0});
+sendtos_ok({unix,sunos}, OSVer) -> not semver_lt(OSVer, {5,12,0});
+sendtos_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {4,0,0});
+sendtos_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,1,0});
+%%
+sendtos_ok({unix,_}, _) -> true;
+sendtos_ok(_, _) -> false.
+
+%% Using the option returns einval, so it is not implemented.
+sendttl_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {19,0,0});
+sendttl_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {4,0,0});
+%% Using the option returns enoprotoopt, so it is not implemented.
+sendttl_ok({unix,freebsd}, OSVer) -> not semver_lt(OSVer, {12,1,0});
+%% Option has no effect
+sendttl_ok({unix,openbsd}, OSVer) -> not semver_lt(OSVer, {6,5,0});
+%%
+sendttl_ok({unix,_}, _) -> true;
+sendttl_ok(_, _) -> false.
+
+%% Using the option returns einval, so it is not implemented.
+sendtclass_ok({unix,darwin}, OSVer) -> not semver_lt(OSVer, {9,9,0});
+sendtclass_ok({unix,linux}, OSVer) -> not semver_lt(OSVer, {2,6,11});
+%%
+sendtclass_ok({unix,_}, _) -> true;
+sendtclass_ok(_, _) -> false.
+
+
 semver_lt({X1,Y1,Z1}, {X2,Y2,Z2}) ->
     if
         X1 > X2 -> false;
@@ -650,18 +714,18 @@ semver_lt({X1,Y1,Z1}, {X2,Y2,Z2}) ->
     end;
 semver_lt(_, {_,_,_}) -> false.
 
-test_recv_opts(Family, Spec, OSFilter) ->
+test_recv_opts(Family, Spec, TestSend, OSFilter) ->
     OSType = os:type(),
     OSVer = os:version(),
     case OSFilter(OSType, OSVer) of
         true ->
             io:format("Os: ~p, ~p~n", [OSType,OSVer]),
-            test_recv_opts(Family, Spec, OSType, OSVer);
+            test_recv_opts(Family, Spec, TestSend, OSType, OSVer);
         false ->
             {skip,{not_supported_for_os_version,{OSType,OSVer}}}
     end.
 %%
-test_recv_opts(Family, Spec, _OSType, _OSVer) ->
+test_recv_opts(Family, Spec, TestSend, _OSType, _OSVer) ->
     Timeout = 5000,
     RecvOpts = [RecvOpt || {RecvOpt,_,_} <- Spec],
     TrueRecvOpts = [{RecvOpt,true} || {RecvOpt,_,_} <- Spec],
@@ -686,16 +750,33 @@ test_recv_opts(Family, Spec, _OSType, _OSVer) ->
     ok = inet:setopts(S1, TrueRecvOpts_OptsVals),
     {ok,TrueRecvOpts_OptsVals} = inet:getopts(S1, RecvOpts ++ Opts),
     %%
+    %% S1 now has true receive options and set option values
+    %%
     {ok,S2} =
         gen_udp:open(0, [Family,binary,{active,true}|FalseRecvOpts]),
     {ok,P2} = inet:port(S2),
     {ok,FalseRecvOpts_OptsVals2} = inet:getopts(S2, RecvOpts ++ Opts),
     OptsVals2 = FalseRecvOpts_OptsVals2 -- FalseRecvOpts,
     %%
-    ok = gen_udp:send(S2, Addr, P1, <<"abcde">>),
+    %% S2 now has false receive options and default option values,
+    %% OptsVals2 contains the default option values
+    %%
+    ok = gen_udp:send(S2, {Addr,P1}, <<"abcde">>),
     ok = gen_udp:send(S1, Addr, P2, <<"fghij">>),
+    TestSend andalso
+        begin
+            ok = gen_udp:send(S2, Addr, P1, OptsVals, <<"ABCDE">>),
+            ok = gen_udp:send(S2, {Addr,P1}, OptsVals, <<"12345">>)
+        end,
     {ok,{_,P2,OptsVals3,<<"abcde">>}} = gen_udp:recv(S1, 0, Timeout),
     verify_sets_eq(OptsVals3, OptsVals2),
+    TestSend andalso
+        begin
+            {ok,{_,P2,OptsVals0,<<"ABCDE">>}} = gen_udp:recv(S1, 0, Timeout),
+            {ok,{_,P2,OptsVals1,<<"12345">>}} = gen_udp:recv(S1, 0, Timeout),
+            verify_sets_eq(OptsVals0, OptsVals),
+            verify_sets_eq(OptsVals1, OptsVals)
+        end,
     receive
         {udp,S2,_,P1,<<"fghij">>} ->
             ok;
@@ -710,8 +791,16 @@ test_recv_opts(Family, Spec, _OSType, _OSVer) ->
     ok = inet:setopts(S2, TrueRecvOpts),
     {ok,TrueRecvOpts} = inet:getopts(S2, RecvOpts),
     %%
-    ok = gen_udp:send(S2, Addr, P1, <<"klmno">>),
-    ok = gen_udp:send(S1, Addr, P2, <<"pqrst">>),
+    %% S1 now has false receive options and set option values
+    %%
+    %% S2 now has true receive options and default option values
+    %%
+    ok = gen_udp:send(S2, {Addr,P1}, [], <<"klmno">>),
+    ok = gen_udp:send(S1, {Family,{loopback,P2}}, <<"pqrst">>),
+    TestSend andalso
+        begin
+            ok = gen_udp:send(S1, {Family,{loopback,P2}}, OptsVals2, <<"PQRST">>)
+        end,
     {ok,{_,P2,<<"klmno">>}} = gen_udp:recv(S1, 0, Timeout),
     receive
         {udp,S2,_,P1,OptsVals4,<<"pqrst">>} ->
@@ -721,9 +810,18 @@ test_recv_opts(Family, Spec, _OSType, _OSVer) ->
     after Timeout ->
             exit(timeout)
     end,
+    TestSend andalso
+        receive
+            {udp,S2,_,P1,OptsVals5,<<"PQRST">>} ->
+                verify_sets_eq(OptsVals5, OptsVals2);
+            Other3 ->
+                exit({unexpected,Other3})
+        after Timeout ->
+                exit(timeout)
+        end,
     ok = gen_udp:close(S1),
     ok = gen_udp:close(S2),
-%%    exit({{OSType,OSVer},success}), % In search for the truth
+%%%    exit({{_OSType,_OSVer},success}), % In search for the truth
     ok.
 
 verify_sets_eq(L1, L2) ->
@@ -877,6 +975,10 @@ connect(Config) when is_list(Config) ->
 implicit_inet6(Config) when is_list(Config) ->
     Host = ok(inet:gethostname()),
     case inet:getaddr(Host, inet6) of
+	{ok,{16#fe80,0,0,0,_,_,_,_} = Addr} ->
+	    {skip,
+	     "Got link local IPv6 address: "
+	     ++inet:ntoa(Addr)};
 	{ok,Addr} ->
 	    implicit_inet6(Host, Addr);
 	{error,Reason} ->
@@ -927,11 +1029,12 @@ ok({ok,V}) -> V;
 ok(NotOk) ->
     try throw(not_ok)
     catch
-	throw:Thrown:Stacktrace ->
-	    erlang:raise(
-	      error, {Thrown, NotOk}, tl(Stacktrace))
+	throw:not_ok:Stacktrace ->
+	    raise_error({not_ok, NotOk}, tl(Stacktrace))
     end.
 
+raise_error(Reason, Stacktrace) ->
+    erlang:raise(error, Reason, Stacktrace).
 
 local_filename(Tag) ->
     "/tmp/" ?MODULE_STRING "_" ++ os:getpid() ++ "_" ++ atom_to_list(Tag).