[socket-nif] Add support for socket (level ipv6) option authhdr & hopopts

Added support for the IPv6 socket option(s) AUTHHDR and HOPOPTS.

Its possible that the option is AUTHHDR is obsolete. It says so in
the include files and when trying to get it (getsockopt) it returns
with enoprotoopt.
The option HOPOPTS returns with einval when calling setsockopt,
so either you need to be a privileged user to update, or its not
actually possible to update this option (even though it says
nothing about that in the man page. It only talks about set).
This is the same behaviour as with RTHDR and HOPLIMIT.
On FreeBSD, it says that HOPOPTS requires superuser privileges.
Needs furher checking.

OTP-14831.

1 files changed, 18 insertions, 9 deletions

diff --git a/erts/preloaded/src/socket.erl b/erts/preloaded/src/socket.erl
index d2267192e5..3c0dc6e95b 100644
--- a/erts/preloaded/src/socket.erl
+++ b/erts/preloaded/src/socket.erl
@@ -632,7 +632,7 @@
 
 %% -define(SOCKET_OPT_IPV6_ADDFORM,            1).
 -define(SOCKET_OPT_IPV6_ADD_MEMBERSHIP,     2).
-%% -define(SOCKET_OPT_IPV6_AUTHHDR,            3).
+-define(SOCKET_OPT_IPV6_AUTHHDR,            3). % Obsolete?
 %% -define(SOCKET_OPT_IPV6_AUTH_LEVEL,         4).
 %% -define(SOCKET_OPT_IPV6_CHECKSUM,           5).
 -define(SOCKET_OPT_IPV6_DROP_MEMBERSHIP,    6).
@@ -642,7 +642,7 @@
 %% -define(SOCKET_OPT_IPV6_FAITH,             10).
 %% -define(SOCKET_OPT_IPV6_FLOWINFO,          11).
 -define(SOCKET_OPT_IPV6_HOPLIMIT,          12).
-%% -define(SOCKET_OPT_IPV6_HOPOPTS,           13).
+-define(SOCKET_OPT_IPV6_HOPOPTS,           13).
 %% -define(SOCKET_OPT_IPV6_IPCOMP_LEVEL,      14).
 %% -define(SOCKET_OPT_IPV6_JOIN_GROUP,        15).
 %% -define(SOCKET_OPT_IPV6_LEAVE_GROUP,       16).
@@ -2249,6 +2249,12 @@ enc_setopt_value(ipv6, add_membership, #{multiaddr := MA,
   when ((is_tuple(MA) andalso (size(MA) =:= 8)) andalso
         (is_integer(IF) andalso (IF >= 0))) ->
     V;
+%% Is this obsolete? When get, the result is enoprotoopt and in the 
+%% header file it says 'obsolete'...
+%% But there might be (old?) versions of linux where it still works...
+enc_setopt_value(ipv6, authhdr, V, _D, T, _P)
+  when is_boolean(V) andalso ((T =:= dgram) orelse (T =:= raw)) ->
+    V;
 enc_setopt_value(ipv6, drop_membership, #{multiaddr := MA,
                                           interface := IF} = V, _D, _T, _P)
   when ((is_tuple(MA) andalso (size(MA) =:= 8)) andalso
@@ -2257,6 +2263,9 @@ enc_setopt_value(ipv6, drop_membership, #{multiaddr := MA,
 enc_setopt_value(ipv6, hoplimit, V, _D, T, _P)
   when is_boolean(V) andalso ((T =:= dgram) orelse (T =:= raw)) ->
     V;
+enc_setopt_value(ipv6, hopopts, V, _D, T, _P)
+  when is_boolean(V) andalso ((T =:= dgram) orelse (T =:= raw)) ->
+    V;
 enc_setopt_value(ipv6, mtu, V, _D, _T, _P) when is_integer(V) ->
     V;
 enc_setopt_value(ipv6, mtu_discover, V, _D, _T, _P)
@@ -2282,8 +2291,8 @@ enc_setopt_value(ipv6, Opt, V, _D, _T, _P)
   when ((Opt =:= recvpktinfo) orelse (Opt =:= pktinfo)) andalso 
        is_boolean(V) ->
     V;
-enc_setopt_value(ipv6, rthdr, V, _D, _T, _P)
-  when is_boolean(V) ->
+enc_setopt_value(ipv6, rthdr, V, _D, T, _P)
+  when is_boolean(V) andalso ((T =:= dgram) orelse (T =:= raw)) ->
     V;
 enc_setopt_value(ipv6, v6only, V, _D, _T, _P) when is_boolean(V) ->
     V;
@@ -2674,9 +2683,9 @@ enc_sockopt_key(ipv6 = L, addrform = Opt, set = _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
 enc_sockopt_key(ipv6, add_membership = _Opt, set = _Dir, _D, _T, _P) ->
     ?SOCKET_OPT_IPV6_ADD_MEMBERSHIP;
-enc_sockopt_key(ipv6 = L, authhdr = Opt, set = _Dir, _D, T, _P) 
+enc_sockopt_key(ipv6 = _L, authhdr = _Opt, _Dir, _D, T, _P) 
   when ((T =:= dgram) orelse (T =:= raw)) ->
-    not_supported({L, Opt});
+    ?SOCKET_OPT_IPV6_AUTHHDR;
 enc_sockopt_key(ipv6 = L, auth_level = Opt, _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
 enc_sockopt_key(ipv6 = L, checksum = Opt, _Dir, _D, _T, _P) ->
@@ -2693,12 +2702,12 @@ enc_sockopt_key(ipv6 = L, esp_network_level = Opt, _Dir, _D, _T, _P) ->
 enc_sockopt_key(ipv6 = L, flowinfo = Opt, set = _Dir, _D, T, _P)
   when (T =:= dgram) orelse (T =:= raw) ->
     not_supported({L, Opt});
-enc_sockopt_key(ipv6, hoplimit = _Opt, _Dir, set = _D, T, _P)
+enc_sockopt_key(ipv6, hoplimit = _Opt, _Dir, _D, T, _P)
   when (T =:= dgram) orelse (T =:= raw) ->
     ?SOCKET_OPT_IPV6_HOPLIMIT;
-enc_sockopt_key(ipv6 = L, hopopts = Opt, set = _Dir, _D, T, _P) 
+enc_sockopt_key(ipv6 = _L, hopopts = _Opt, _Dir, _D, T, _P) 
   when ((T =:= dgram) orelse (T =:= raw)) ->
-    not_supported({L, Opt});
+    ?SOCKET_OPT_IPV6_HOPOPTS;
 enc_sockopt_key(ipv6 = L, ipcomp_level = Opt, _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
 enc_sockopt_key(ipv6 = L, join_group = Opt, _Dir, _D, _T, _P) ->