Merge branch 'raimo/IPV6_V6ONLY/OTP-8928'

* raimo/IPV6_V6ONLY/OTP-8928:
  kernel: Document socket option ipv6_v6only
  kernel: Add test cases for socket option ipv6_v6only
  erts,kernel: Implement socket option ipv6_v6only in erlang code
  erts: Implement socket option IPV6_V6ONLY
  erts: Add configure test for IPV6_V6ONLY

4 files changed, 76 insertions, 2 deletions

diff --git a/erts/configure.in b/erts/configure.in
index 6ad1951a4e..3256b0cb59 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -2000,8 +2000,12 @@ case "$erts_cv_have_in6addr_loopback" in
              [Define to 1 if you have the variable in6addr_loopback declared.])
 esac
 
-AC_CHECK_DECLS([IN6ADDR_ANY_INIT, IN6ADDR_LOOPBACK_INIT], [], [],
-	       [#include <netinet/in.h>])
+AC_CHECK_DECLS([IN6ADDR_ANY_INIT, IN6ADDR_LOOPBACK_INIT, IPV6_V6ONLY], [], [],
+	       [
+		#include <sys/types.h>
+		#include <sys/socket.h>
+		#include <netinet/in.h>
+	       ])
 
 dnl ----------------------------------------------------------------------
 dnl Checks for features/quirks in the system that affects Erlang.
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 80f504a361..3210ffa92a 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -660,6 +660,7 @@ static int my_strncasecmp(const char *s1, const char *s2, size_t n)
 #define UDP_OPT_MULTICAST_LOOP 13 /* set/get IP multicast loopback */
 #define UDP_OPT_ADD_MEMBERSHIP 14 /* add an IP group membership */
 #define UDP_OPT_DROP_MEMBERSHIP 15 /* drop an IP group membership */
+#define INET_OPT_IPV6_V6ONLY 16 /* IPv6 only socket, no mapped v4 addrs */
 /* LOPT is local options */
 #define INET_LOPT_BUFFER      20  /* min buffer size hint */
 #define INET_LOPT_HEADER      21  /* list header size */
@@ -1167,6 +1168,7 @@ static ErlDrvTermData am_reuseaddr;
 static ErlDrvTermData am_dontroute;
 static ErlDrvTermData am_priority;
 static ErlDrvTermData am_tos;
+static ErlDrvTermData am_ipv6_v6only;
 #endif
 
 /* speical errors for bad ports and sequences */
@@ -3486,6 +3488,7 @@ static void inet_init_sctp(void) {
     INIT_ATOM(dontroute);
     INIT_ATOM(priority);
     INIT_ATOM(tos);
+    INIT_ATOM(ipv6_v6only);
     
     /* Option names */
     INIT_ATOM(sctp_rtoinfo);
@@ -5618,6 +5621,23 @@ static int inet_set_opts(inet_descriptor* desc, char* ptr, int len)
 
 #endif /* HAVE_MULTICAST_SUPPORT */
 
+	case INET_OPT_IPV6_V6ONLY:
+#if HAVE_DECL_IPV6_V6ONLY
+	    proto = IPPROTO_IPV6;
+	    type = IPV6_V6ONLY;
+	    propagate = 1;
+	    DEBUGF(("inet_set_opts(%ld): s=%d, IPV6_V6ONLY=%d\r\n",
+		    (long)desc->port, desc->s, ival));
+	    break;
+#elif defined(__WIN32__) && defined(HAVE_IN6) && defined(AF_INET6)
+	    /* Fake a'la OpenBSD; set to 'true' is fine but 'false' invalid. */
+	    if (ival != 0) continue;
+	    else return -1;
+	    break;
+#else
+	    continue;
+#endif
+
 	case INET_OPT_RAW:
 	    if (len < 8) {
 		return -1;
@@ -5947,6 +5967,22 @@ static int sctp_set_opts(inet_descriptor* desc, char* ptr, int len)
 	    continue; /* Option not supported -- ignore it */
 #	endif
 
+	case INET_OPT_IPV6_V6ONLY:
+#       if HAVE_DECL_IPV6_V6ONLY
+	{
+	    arg.ival= get_int32 (curr);   curr += 4;
+	    proto   = IPPROTO_IPV6;
+	    type    = IPV6_V6ONLY;
+	    arg_ptr = (char*) (&arg.ival);
+	    arg_sz  = sizeof  ( arg.ival);
+	    break;
+	}
+#       elif defined(__WIN32__) && defined(HAVE_IN6) && defined(AF_INET6)
+#           error Here is a fix for Win IPv6 SCTP missing
+#       else
+	    continue; /* Option not supported -- ignore it */
+#       endif
+
 	case SCTP_OPT_AUTOCLOSE:
 	{
 	    arg.ival= get_int32 (curr);	  curr += 4;
@@ -6435,6 +6471,22 @@ static ErlDrvSSizeT inet_fill_opts(inet_descriptor* desc,
 	    break;
 #endif /* HAVE_MULTICAST_SUPPORT */
 
+	case INET_OPT_IPV6_V6ONLY:
+#if HAVE_DECL_IPV6_V6ONLY
+	    proto = IPPROTO_IPV6;
+	    type = IPV6_V6ONLY;
+	    break;
+#elif defined(__WIN32__) && defined(HAVE_IN6) && defined(AF_INET6)
+	    /* Fake reading 'true' */
+	    *ptr++ = opt;
+	    put_int32(1, ptr);
+	    ptr += 4;
+	    continue;
+#else
+	    TRUNCATE_TO(0,ptr);
+	    continue; /* skip - no result */
+#endif
+
 	case INET_OPT_RAW:
 	    {
 		int data_provided;
@@ -6739,6 +6791,7 @@ static ErlDrvSSizeT sctp_fill_opts(inet_descriptor* desc,
 	case INET_OPT_DONTROUTE:
 	case INET_OPT_PRIORITY :
 	case INET_OPT_TOS      :
+	case INET_OPT_IPV6_V6ONLY:
 	case SCTP_OPT_AUTOCLOSE:
 	case SCTP_OPT_MAXSEG   :
 	/* The following options return true or false:	       */
@@ -6811,6 +6864,20 @@ static ErlDrvSSizeT sctp_fill_opts(inet_descriptor* desc,
 		continue;
 #	    endif
 	    }
+	    case INET_OPT_IPV6_V6ONLY:
+#           if HAVE_DECL_IPV6_V6ONLY
+	    {
+		proto  = IPPROTO_IPV6;
+		type   = IPV6_V6ONLY;
+		tag    = am_ipv6_v6only;
+		break;
+	    }
+#           elif defined(__WIN32__) && defined(HAVE_IN6) && defined(AF_INET6)
+#               error Here is a fix for Win IPv6 SCTP needed
+#           else
+		/* Not supported -- ignore */
+		continue;
+#           endif
 	    case SCTP_OPT_AUTOCLOSE:
 	    {
 		proto  = IPPROTO_SCTP;
diff --git a/erts/preloaded/ebin/prim_inet.beam b/erts/preloaded/ebin/prim_inet.beam
index 5409cf2dfc..b2d224e560 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 b639b1efdd..b9800a05da 100644
--- a/erts/preloaded/src/prim_inet.erl
+++ b/erts/preloaded/src/prim_inet.erl
@@ -1062,6 +1062,7 @@ enc_opt(multicast_ttl)   -> ?UDP_OPT_MULTICAST_TTL;
 enc_opt(multicast_loop)  -> ?UDP_OPT_MULTICAST_LOOP;
 enc_opt(add_membership)  -> ?UDP_OPT_ADD_MEMBERSHIP;
 enc_opt(drop_membership) -> ?UDP_OPT_DROP_MEMBERSHIP;
+enc_opt(ipv6_v6only)     -> ?INET_OPT_IPV6_V6ONLY;
 enc_opt(buffer)          -> ?INET_LOPT_BUFFER;
 enc_opt(header)          -> ?INET_LOPT_HEADER;
 enc_opt(active)          -> ?INET_LOPT_ACTIVE;
@@ -1115,6 +1116,7 @@ dec_opt(?UDP_OPT_MULTICAST_TTL)   -> multicast_ttl;
 dec_opt(?UDP_OPT_MULTICAST_LOOP)  -> multicast_loop;
 dec_opt(?UDP_OPT_ADD_MEMBERSHIP)  -> add_membership;
 dec_opt(?UDP_OPT_DROP_MEMBERSHIP) -> drop_membership;
+dec_opt(?INET_OPT_IPV6_V6ONLY)    -> ipv6_v6only;
 dec_opt(?INET_LOPT_BUFFER)        -> buffer;
 dec_opt(?INET_LOPT_HEADER)        -> header;
 dec_opt(?INET_LOPT_ACTIVE)        -> active;
@@ -1178,6 +1180,7 @@ type_opt_1(recbuf)          -> int;
 type_opt_1(priority)        -> int;
 type_opt_1(tos)             -> int;
 type_opt_1(nodelay)         -> bool;
+type_opt_1(ipv6_v6only)     -> bool;
 %% multicast
 type_opt_1(multicast_ttl)   -> int;
 type_opt_1(multicast_loop)  -> bool;