[socket-nif] Add support for socket (level ipv6) option recvpktinfo

Added support for the IPv6 socket option RECVPKTINFO.
This option is called PKTINFO on FreeBSD, so that value
will also be accepted.

OTP-14831.

4 files changed, 81 insertions, 18 deletions

diff --git a/erts/doc/src/socket_usage.xml b/erts/doc/src/socket_usage.xml
index af21806243..78662e7d0d 100644
--- a/erts/doc/src/socket_usage.xml
+++ b/erts/doc/src/socket_usage.xml
@@ -468,6 +468,13 @@
 	<cell>none</cell>
       </row>
       <row>
+	<cell>recvpktinfo | pktinfo</cell>
+	<cell>boolean()</cell>
+	<cell>yes</cell>
+	<cell>yes</cell>
+	<cell>type = dgram | raw</cell>
+      </row>
+      <row>
 	<cell>v6only</cell>
 	<cell>boolean()</cell>
 	<cell>yes</cell>
diff --git a/erts/emulator/nifs/common/socket_nif.c b/erts/emulator/nifs/common/socket_nif.c
index 218ed66f52..35997c359d 100644
--- a/erts/emulator/nifs/common/socket_nif.c
+++ b/erts/emulator/nifs/common/socket_nif.c
@@ -543,7 +543,8 @@ typedef union {
 #define SOCKET_OPT_IPV6_MULTICAST_HOPS       19
 #define SOCKET_OPT_IPV6_MULTICAST_IF         20
 #define SOCKET_OPT_IPV6_MULTICAST_LOOP       21
-#define SOCKET_OPT_IPV6_V6ONLY               33
+#define SOCKET_OPT_IPV6_RECVPKTINFO          25 // PKTINFO on FreeBSD
+#define SOCKET_OPT_IPV6_V6ONLY               32
 
 #define SOCKET_OPT_TCP_CONGESTION   1
 #define SOCKET_OPT_TCP_CORK         2
@@ -1234,6 +1235,11 @@ static ERL_NIF_TERM nsetopt_lvl_ipv6_multicast_loop(ErlNifEnv*        env,
                                                     SocketDescriptor* descP,
                                                     ERL_NIF_TERM      eVal);
 #endif
+#if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO)
+static ERL_NIF_TERM nsetopt_lvl_ipv6_recvpktinfo(ErlNifEnv*        env,
+                                                 SocketDescriptor* descP,
+                                                 ERL_NIF_TERM      eVal);
+#endif
 #if defined(IPV6_V6ONLY)
 static ERL_NIF_TERM nsetopt_lvl_ipv6_v6only(ErlNifEnv*        env,
                                             SocketDescriptor* descP,
@@ -1535,6 +1541,10 @@ static ERL_NIF_TERM ngetopt_lvl_ipv6_multicast_if(ErlNifEnv*        env,
 static ERL_NIF_TERM ngetopt_lvl_ipv6_multicast_loop(ErlNifEnv*        env,
                                                     SocketDescriptor* descP);
 #endif
+#if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO)
+static ERL_NIF_TERM ngetopt_lvl_ipv6_recvpktinfo(ErlNifEnv*        env,
+                                                 SocketDescriptor* descP);
+#endif
 #if defined(IPV6_V6ONLY)
 static ERL_NIF_TERM ngetopt_lvl_ipv6_v6only(ErlNifEnv*        env,
                                             SocketDescriptor* descP);
@@ -5556,6 +5566,12 @@ ERL_NIF_TERM nsetopt_lvl_ipv6(ErlNifEnv*        env,
         break;
 #endif
 
+#if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO)
+    case SOCKET_OPT_IPV6_RECVPKTINFO:
+        result = nsetopt_lvl_ipv6_recvpktinfo(env, descP, eVal);
+        break;
+#endif
+
 #if defined(IPV6_V6ONLY)
     case SOCKET_OPT_IPV6_V6ONLY:
         result = nsetopt_lvl_ipv6_v6only(env, descP, eVal);
@@ -5688,6 +5704,22 @@ ERL_NIF_TERM nsetopt_lvl_ipv6_multicast_loop(ErlNifEnv*        env,
 #endif
 
 
+#if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO)
+static
+ERL_NIF_TERM nsetopt_lvl_ipv6_recvpktinfo(ErlNifEnv*        env,
+                                          SocketDescriptor* descP,
+                                          ERL_NIF_TERM      eVal)
+{
+#if defined(IPV6_RECVPKTINFO)
+    int opt = IPV6_RECVPKTINFO;
+#else
+    int opt = IPV6_PKTINFO;
+#endif
+
+    return nsetopt_bool_opt(env, descP, SOL_IPV6, opt, eVal);
+}
+#endif
+
 
 #if defined(IPV6_V6ONLY)
 static
@@ -8052,6 +8084,12 @@ ERL_NIF_TERM ngetopt_lvl_ipv6(ErlNifEnv*        env,
         break;
 #endif
 
+#if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO)
+    case SOCKET_OPT_IPV6_RECVPKTINFO:
+        result = ngetopt_lvl_ipv6_recvpktinfo(env, descP);
+        break;
+#endif
+
 #if defined(IPV6_V6ONLY)
     case SOCKET_OPT_IPV6_V6ONLY:
         result = ngetopt_lvl_ipv6_v6only(env, descP);
@@ -8151,6 +8189,22 @@ ERL_NIF_TERM ngetopt_lvl_ipv6_multicast_loop(ErlNifEnv*        env,
 #endif
 
 
+#if defined(IPV6_RECVPKTINFO) || defined(IPV6_PKTINFO)
+static
+ERL_NIF_TERM ngetopt_lvl_ipv6_recvpktinfo(ErlNifEnv*        env,
+                                          SocketDescriptor* descP)
+{
+#if defined(IPV6_RECVPKTINFO)
+    int opt = IPV6_RECVPKTINFO;
+#else
+    int opt = IPV6_PKTINFO;
+#endif
+
+    return ngetopt_bool_opt(env, descP, SOL_IPV6, opt);
+}
+#endif
+
+
 #if defined(IPV6_V6ONLY)
 static
 ERL_NIF_TERM ngetopt_lvl_ipv6_v6only(ErlNifEnv*        env,
diff --git a/erts/preloaded/ebin/socket.beam b/erts/preloaded/ebin/socket.beam
index 5decdd72c2..15bc762ae9 100644
--- a/erts/preloaded/ebin/socket.beam
+++ b/erts/preloaded/ebin/socket.beam
diff --git a/erts/preloaded/src/socket.erl b/erts/preloaded/src/socket.erl
index 7f160207b1..7e9b61ba8f 100644
--- a/erts/preloaded/src/socket.erl
+++ b/erts/preloaded/src/socket.erl
@@ -376,10 +376,9 @@
         multicast_if |
         multicast_loop |
         portrange |
-        pktinfo |
         pktoptions |
         recverr |
-        recvpktinfo |
+        recvpktinfo | pktinfo |
         recvtclass |
         router_alert |
         rthdr |
@@ -653,17 +652,16 @@
 -define(SOCKET_OPT_IPV6_MULTICAST_IF,      20).
 -define(SOCKET_OPT_IPV6_MULTICAST_LOOP,    21).
 %% -define(SOCKET_OPT_IPV6_PORTRANGE,         22).
-%% -define(SOCKET_OPT_IPV6_PKTINFO,           23).
-%% -define(SOCKET_OPT_IPV6_PKTOPTIONS,        24).
-%% -define(SOCKET_OPT_IPV6_RECVERR,           25).
-%% -define(SOCKET_OPT_IPV6_RECVPKTINFO,       26).
-%% -define(SOCKET_OPT_IPV6_RECVTCLASS,        27).
-%% -define(SOCKET_OPT_IPV6_ROUTER_ALERT,      28).
-%% -define(SOCKET_OPT_IPV6_RTHDR,             29).
-%% -define(SOCKET_OPT_IPV6_TCLASS,            30).
-%% -define(SOCKET_OPT_IPV6_UNICAST_HOPS,      31).
-%% -define(SOCKET_OPT_IPV6_USE_MIN_MTU,       32).
--define(SOCKET_OPT_IPV6_V6ONLY,            33).
+%% -define(SOCKET_OPT_IPV6_PKTOPTIONS,        23).
+%% -define(SOCKET_OPT_IPV6_RECVERR,           24).
+-define(SOCKET_OPT_IPV6_RECVPKTINFO,       25). % On FreeBSD: PKTINFO
+%% -define(SOCKET_OPT_IPV6_RECVTCLASS,        26).
+%% -define(SOCKET_OPT_IPV6_ROUTER_ALERT,      27).
+%% -define(SOCKET_OPT_IPV6_RTHDR,             28).
+%% -define(SOCKET_OPT_IPV6_TCLASS,            29).
+%% -define(SOCKET_OPT_IPV6_UNICAST_HOPS,      30).
+%% -define(SOCKET_OPT_IPV6_USE_MIN_MTU,       31).
+-define(SOCKET_OPT_IPV6_V6ONLY,            32).
 
 -define(SOCKET_OPT_TCP_CONGESTION,      1).
 -define(SOCKET_OPT_TCP_CORK,            2).
@@ -2280,6 +2278,10 @@ enc_setopt_value(ipv6, multicast_if, V, _D, _T, _P)
 enc_setopt_value(ipv6, multicast_loop, V, _D, _T, _P)
   when is_boolean(V) ->
     V;
+enc_setopt_value(ipv6, Opt, V, _D, _T, _P)
+  when ((Opt =:= recvpktinfo) orelse (Opt =:= pktinfo)) andalso 
+       is_boolean(V) ->
+    V;
 enc_setopt_value(ipv6, v6only, V, _D, _T, _P) when is_boolean(V) ->
     V;
 enc_setopt_value(ipv6 = L, Opt, V, _D, _T, _P) ->
@@ -2713,14 +2715,14 @@ enc_sockopt_key(ipv6 = _L, multicast_loop = _Opt, _Dir, _D, _T, _P) ->
     ?SOCKET_OPT_IPV6_MULTICAST_LOOP;
 enc_sockopt_key(ipv6 = L, portrange = Opt, _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
-enc_sockopt_key(ipv6 = L, pktinfo = Opt, _Dir, _D, _T, _P) ->
-    not_supported({L, Opt});
 enc_sockopt_key(ipv6 = L, pktoptions = Opt, _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
 enc_sockopt_key(ipv6 = L, recverr = Opt, _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
-enc_sockopt_key(ipv6 = L, recvpktinfo = Opt, _Dir, _D, _T, _P) ->
-    not_supported({L, Opt});
+enc_sockopt_key(ipv6 = _L, Opt, _Dir, _D, T, _P) 
+  when ((Opt =:= recvpktinfo) orelse (Opt =:= pktinfo)) andalso 
+       ((T =:= dgram) orelse (T =:= raw)) ->
+    ?SOCKET_OPT_IPV6_RECVPKTINFO;
 enc_sockopt_key(ipv6 = L, recvtclass = Opt, _Dir, _D, _T, _P) ->
     not_supported({L, Opt});
 enc_sockopt_key(ipv6 = L, router_alert = Opt, _Dir, _D, _T, _P) ->