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Merge branch 'tab/fix-sctp-multihoming-IPv6/OTP-10217' into maint

* tab/fix-sctp-multihoming-IPv6/OTP-10217:
  Allow mixed IPv4 and IPv6 addresses to sctp_bindx
  Add checks for in6addr_any and in6addr_loopback
  Fix SCTP multihoming
  inet_drv.c: Set sockaddr lengths in inet_set_[f]address
  • Loading branch information...
commit 618e0f37c9dda5bc26900692ed0cc41031be9e76 2 parents ae2c50f + 8757050
@gustehn gustehn authored
View
58 erts/configure.in
@@ -1944,6 +1944,64 @@ AC_CHECK_FUNCS([openpty])
AC_CHECK_HEADERS(net/if_dl.h ifaddrs.h netpacket/packet.h)
AC_CHECK_FUNCS([getifaddrs])
+dnl Checks for variables in6addr_any and in6addr_loopback,
+dnl
+dnl They normally declared by netinet/in.h, according to POSIX,
+dnl but not on Windows 7 (Windows SDK 7.1). I would have liked
+dnl to just write AC_CHECK_DECL([in6addr_any], ...) but if doing so,
+dnl the configure check fails erroneously on Linux with the error
+dnl "cannot convert to a pointer type", on a line looking like
+dnl "char *p = (char *) in6addr_any;", so work around that
+dnl with some more code.
+AC_CACHE_CHECK(
+ [whether in6addr_any is declared],
+ [erts_cv_have_in6addr_any],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+ #include <sys/types.h>
+ #include <sys/socket.h>
+ #include <netinet/in.h>
+ ]],
+ [[printf("%d", in6addr_any.s6_addr[16]);]]
+ )],
+ [erts_cv_have_in6addr_any=yes],
+ [erts_cv_have_in6addr_any=no]
+ )]
+)
+
+case "$erts_cv_have_in6addr_any" in
+ yes)
+ AC_DEFINE([HAVE_IN6ADDR_ANY], [1],
+ [Define to 1 if you have the variable in6addr_any declared.])
+esac
+
+AC_CACHE_CHECK(
+ [whether in6addr_loopback is declared],
+ [erts_cv_have_in6addr_loopback],
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+ #include <sys/types.h>
+ #include <sys/socket.h>
+ #include <netinet/in.h>
+ ]],
+ [[printf("%d", in6addr_loopback.s6_addr[16]);]]
+ )],
+ [erts_cv_have_in6addr_loopback=yes],
+ [erts_cv_have_in6addr_loopback=no]
+ )]
+)
+
+case "$erts_cv_have_in6addr_loopback" in
+ yes)
+ AC_DEFINE([HAVE_IN6ADDR_LOOPBACK], [1],
+ [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>])
+
dnl ----------------------------------------------------------------------
dnl Checks for features/quirks in the system that affects Erlang.
dnl ----------------------------------------------------------------------
View
73 erts/emulator/drivers/common/inet_drv.c
@@ -1228,6 +1228,27 @@ struct erl_drv_entry inet_driver_entry =
NULL,
};
+#if HAVE_IN6
+# if ! defined(HAVE_IN6ADDR_ANY) || ! HAVE_IN6ADDR_ANY
+# if HAVE_DECL_IN6ADDR_ANY_INIT
+static const struct in6_addr in6addr_any = { { IN6ADDR_ANY_INIT } };
+# else
+static const struct in6_addr in6addr_any =
+ { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
+# endif /* HAVE_IN6ADDR_ANY_INIT */
+# endif /* ! HAVE_DECL_IN6ADDR_ANY */
+
+# if ! defined(HAVE_IN6ADDR_LOOPBACK) || ! HAVE_IN6ADDR_LOOPBACK
+# if HAVE_DECL_IN6ADDR_LOOPBACK_INIT
+static const struct in6_addr in6addr_loopback =
+ { { IN6ADDR_LOOPBACK_INIT } };
+# else
+static const struct in6_addr in6addr_loopback =
+ { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } };
+# endif /* HAVE_IN6ADDR_LOOPBACk_INIT */
+# endif /* ! HAVE_DECL_IN6ADDR_LOOPBACK */
+#endif /* HAVE_IN6 */
+
/* XXX: is this a driver interface function ??? */
void erl_exit(int n, char*, ...);
@@ -3706,6 +3727,9 @@ static char* inet_set_address(int family, inet_address* dst,
if ((family == AF_INET) && (*len >= 2+4)) {
sys_memzero((char*)dst, sizeof(struct sockaddr_in));
port = get_int16(src);
+#ifndef NO_SA_LEN
+ dst->sai.sin_len = sizeof(struct sockaddr_in);
+#endif
dst->sai.sin_family = family;
dst->sai.sin_port = sock_htons(port);
sys_memcpy(&dst->sai.sin_addr, src+2, 4);
@@ -3716,6 +3740,9 @@ static char* inet_set_address(int family, inet_address* dst,
else if ((family == AF_INET6) && (*len >= 2+16)) {
sys_memzero((char*)dst, sizeof(struct sockaddr_in6));
port = get_int16(src);
+#ifndef NO_SA_LEN
+ dst->sai6.sin6_len = sizeof(struct sockaddr_in6);
+#endif
dst->sai6.sin6_family = family;
dst->sai6.sin6_port = sock_htons(port);
dst->sai6.sin6_flowinfo = 0; /* XXX this may be set as well ?? */
@@ -3726,7 +3753,7 @@ static char* inet_set_address(int family, inet_address* dst,
#endif
return NULL;
}
-#ifdef HAVE_SCTP
+
/*
** Set an inaddr structure, address family comes from source data,
** or from argument if source data specifies constant address.
@@ -3770,6 +3797,9 @@ static char *inet_set_faddress(int family, inet_address* dst,
return NULL;
}
sys_memzero((char*)dst, sizeof(struct sockaddr_in));
+#ifndef NO_SA_LEN
+ dst->sai.sin_len = sizeof(struct sockaddr_in6);
+#endif
dst->sai.sin_family = family;
dst->sai.sin_port = sock_htons(port);
dst->sai.sin_addr.s_addr = addr.s_addr;
@@ -3789,6 +3819,9 @@ static char *inet_set_faddress(int family, inet_address* dst,
return NULL;
}
sys_memzero((char*)dst, sizeof(struct sockaddr_in6));
+#ifndef NO_SA_LEN
+ dst->sai6.sin6_len = sizeof(struct sockaddr_in6);
+#endif
dst->sai6.sin6_family = family;
dst->sai6.sin6_port = sock_htons(port);
dst->sai6.sin6_flowinfo = 0; /* XXX this may be set as well ?? */
@@ -3806,7 +3839,7 @@ static char *inet_set_faddress(int family, inet_address* dst,
}
return inet_set_address(family, dst, src, len);
}
-#endif /* HAVE_SCTP */
+
/* Get a inaddr structure
** src = inaddr structure
@@ -7771,7 +7804,7 @@ static ErlDrvSSizeT inet_ctl(inet_descriptor* desc, int cmd, char* buf,
if (desc->state != INET_STATE_OPEN)
return ctl_xerror(EXBADPORT, rbuf, rsize);
- if (inet_set_address(desc->sfamily, &local, buf, &len) == NULL)
+ if (inet_set_faddress(desc->sfamily, &local, buf, &len) == NULL)
return ctl_error(EINVAL, rbuf, rsize);
if (IS_SOCKET_ERROR(sock_bind(desc->s,(struct sockaddr*) &local, len)))
@@ -10136,12 +10169,13 @@ static ErlDrvSSizeT packet_inet_ctl(ErlDrvData e, unsigned int cmd, char* buf,
case SCTP_REQ_BINDX:
{ /* Multi-homing bind for SCTP: */
- /* Construct the list of addresses we bind to. The curr limit is
- 256 addrs. Buff structure: Flags(1), ListItem,...:
+ /* Add additional addresses by calling sctp_bindx with one address
+ at a time, since this is what some OSes promise will work.
+ Buff structure: Flags(1), ListItem,...:
*/
- struct sockaddr addrs[256];
+ inet_address addr;
char* curr;
- int add_flag, n, rflag;
+ int add_flag, rflag;
if (!IS_SCTP(desc))
return ctl_xerror(EXBADPORT, rbuf, rsize);
@@ -10150,27 +10184,22 @@ static ErlDrvSSizeT packet_inet_ctl(ErlDrvData e, unsigned int cmd, char* buf,
add_flag = get_int8(curr);
curr++;
- for(n=0; n < 256 && curr < buf+len; n++)
+ /* Make the real flags: */
+ rflag = add_flag ? SCTP_BINDX_ADD_ADDR : SCTP_BINDX_REM_ADDR;
+
+ while (curr < buf+len)
{
- /* List item format: Port(2), IP(4|16) -- compatible with
- "inet_set_address": */
- inet_address tmp;
+ /* List item format: see "inet_set_faddress": */
ErlDrvSizeT alen = buf + len - curr;
- curr = inet_set_address(desc->sfamily, &tmp, curr, &alen);
+ curr = inet_set_faddress(desc->sfamily, &addr, curr, &alen);
if (curr == NULL)
return ctl_error(EINVAL, rbuf, rsize);
- /* Now: we need to squeeze "tmp" into the size of "sockaddr",
- which is smaller than "tmp" for IPv6 (extra IN6 info will
- be cut off): */
- memcpy(addrs + n, &tmp, sizeof(struct sockaddr));
+ /* Invoke the call: */
+ if (p_sctp_bindx(desc->s, (struct sockaddr *)&addr, 1,
+ rflag) < 0)
+ return ctl_error(sock_errno(), rbuf, rsize);
}
- /* Make the real flags: */
- rflag = add_flag ? SCTP_BINDX_ADD_ADDR : SCTP_BINDX_REM_ADDR;
-
- /* Invoke the call: */
- if (p_sctp_bindx(desc->s, addrs, n, rflag) < 0)
- return ctl_error(sock_errno(), rbuf, rsize);
desc->state = INET_STATE_BOUND;
View
BIN  erts/preloaded/ebin/prim_inet.beam
Binary file not shown
View
6 erts/preloaded/src/prim_inet.erl
@@ -184,7 +184,7 @@ close_pend_loop(S, N) ->
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
bind(S,IP,Port) when is_port(S), is_integer(Port), Port >= 0, Port =< 65535 ->
- case ctl_cmd(S,?INET_REQ_BIND,[?int16(Port),ip_to_bytes(IP)]) of
+ case ctl_cmd(S,?INET_REQ_BIND,enc_value(set, addr, {IP,Port})) of
{ok, [P1,P0]} -> {ok, ?u16(P1, P0)};
{error,_}=Error -> Error
end;
@@ -206,10 +206,10 @@ bindx(S, AddFlag, Addrs) ->
case getprotocol(S) of
sctp ->
%% Really multi-homed "bindx". Stringified args:
- %% [AddFlag, (Port, IP)+]:
+ %% [AddFlag, (AddrBytes see enc_value_2(addr,X))+]:
Args =
[?int8(AddFlag)|
- [[?int16(Port)|ip_to_bytes(IP)] ||
+ [enc_value(set, addr, {IP,Port}) ||
{IP, Port} <- Addrs]],
case ctl_cmd(S, ?SCTP_REQ_BINDX, Args) of
{ok,_} -> {ok, S};
View
42 lib/kernel/src/inet.erl
@@ -763,8 +763,12 @@ sctp_opt([Opt|Opts], Mod, R, As) ->
{Name,Val} -> sctp_opt (Opts, Mod, R, As, Name, Val);
_ -> {error,badarg}
end;
-sctp_opt([], _Mod, R, _SockOpts) ->
- {ok, R}.
+sctp_opt([], _Mod, #sctp_opts{ifaddr=IfAddr}=R, _SockOpts) ->
+ if is_list(IfAddr) ->
+ {ok, R#sctp_opts{ifaddr=lists:reverse(IfAddr)}};
+ true ->
+ {ok, R}
+ end.
sctp_opt(Opts, Mod, R, As, Name, Val) ->
case add_opt(Name, Val, R#sctp_opts.opts, As) of
@@ -1015,11 +1019,7 @@ open(Fd, Addr, Port, Opts, Protocol, Family, Type, Module) when Fd < 0 ->
case prim_inet:setopts(S, Opts) of
ok ->
case if is_list(Addr) ->
- prim_inet:bind(S, add,
- [case A of
- {_,_} -> A;
- _ -> {A,Port}
- end || A <- Addr]);
+ bindx(S, Addr, Port);
true ->
prim_inet:bind(S, Addr, Port)
end of
@@ -1040,6 +1040,34 @@ open(Fd, Addr, Port, Opts, Protocol, Family, Type, Module) when Fd < 0 ->
open(Fd, _Addr, _Port, Opts, Protocol, Family, Type, Module) ->
fdopen(Fd, Opts, Protocol, Family, Type, Module).
+bindx(S, [Addr], Port0) ->
+ {IP, Port} = set_bindx_port(Addr, Port0),
+ prim_inet:bind(S, IP, Port);
+bindx(S, Addrs, Port0) ->
+ [{IP, Port} | Rest] = [set_bindx_port(Addr, Port0) || Addr <- Addrs],
+ case prim_inet:bind(S, IP, Port) of
+ {ok, AssignedPort} when Port =:= 0 ->
+ %% On newer Linux kernels, Solaris and FreeBSD, calling
+ %% bindx with port 0 is ok, but on SuSE 10, it results in einval
+ Rest2 = [change_bindx_0_port(Addr, AssignedPort) || Addr <- Rest],
+ prim_inet:bind(S, add, Rest2);
+ {ok, _} ->
+ prim_inet:bind(S, add, Rest);
+ Error ->
+ Error
+ end.
+
+set_bindx_port({_IP, _Port}=Addr, _OtherPort) ->
+ Addr;
+set_bindx_port(IP, Port) ->
+ {IP, Port}.
+
+change_bindx_0_port({IP, 0}, AssignedPort) ->
+ {IP, AssignedPort};
+change_bindx_0_port({_IP, _Port}=Addr, _AssignedPort) ->
+ Addr.
+
+
-spec fdopen(Fd :: non_neg_integer(),
Opts :: [socket_setopt()],
Protocol :: socket_protocol(),
View
198 lib/kernel/test/gen_sctp_SUITE.erl
@@ -31,14 +31,22 @@
[basic/1,
api_open_close/1,api_listen/1,api_connect_init/1,api_opts/1,
xfer_min/1,xfer_active/1,def_sndrcvinfo/1,implicit_inet6/1,
- basic_stream/1, xfer_stream_min/1, peeloff/1, buffers/1]).
+ basic_stream/1, xfer_stream_min/1, peeloff/1, buffers/1,
+ open_multihoming_ipv4_socket/1,
+ open_unihoming_ipv6_socket/1,
+ open_multihoming_ipv6_socket/1,
+ open_multihoming_ipv4_and_ipv6_socket/1]).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[basic, api_open_close, api_listen, api_connect_init,
api_opts, xfer_min, xfer_active, def_sndrcvinfo, implicit_inet6,
- basic_stream, xfer_stream_min, peeloff, buffers].
+ basic_stream, xfer_stream_min, peeloff, buffers,
+ open_multihoming_ipv4_socket,
+ open_unihoming_ipv6_socket,
+ open_multihoming_ipv6_socket,
+ open_multihoming_ipv4_and_ipv6_socket].
groups() ->
[].
@@ -1105,6 +1113,192 @@ mk_data(N, Bytes, Bin) when N < Bytes ->
mk_data(_, _, Bin) ->
Bin.
+
+
+open_multihoming_ipv4_socket(doc) ->
+ "Test opening a multihoming ipv4 socket";
+open_multihoming_ipv4_socket(suite) ->
+ [];
+open_multihoming_ipv4_socket(Config) when is_list(Config) ->
+ ?line case get_addrs_by_family(inet, 2) of
+ {ok, [Addr1, Addr2]} ->
+ ?line do_open_and_connect([Addr1, Addr2], Addr1);
+ {error, Reason} ->
+ {skip, Reason}
+ end.
+
+open_unihoming_ipv6_socket(doc) ->
+ %% This test is mostly aimed to indicate
+ %% whether host has a non-working ipv6 setup
+ "Test opening a unihoming (non-multihoming) ipv6 socket";
+open_unihoming_ipv6_socket(suite) ->
+ [];
+open_unihoming_ipv6_socket(Config) when is_list(Config) ->
+ ?line case get_addrs_by_family(inet6, 1) of
+ {ok, [Addr]} ->
+ ?line do_open_and_connect([Addr], Addr);
+ {error, Reason} ->
+ {skip, Reason}
+ end.
+
+
+open_multihoming_ipv6_socket(doc) ->
+ "Test opening a multihoming ipv6 socket";
+open_multihoming_ipv6_socket(suite) ->
+ [];
+open_multihoming_ipv6_socket(Config) when is_list(Config) ->
+ ?line case get_addrs_by_family(inet6, 2) of
+ {ok, [Addr1, Addr2]} ->
+ ?line do_open_and_connect([Addr1, Addr2], Addr1);
+ {error, Reason} ->
+ {skip, Reason}
+ end.
+
+open_multihoming_ipv4_and_ipv6_socket(doc) ->
+ "Test opening a multihoming ipv6 socket with ipv4 and ipv6 addresses";
+open_multihoming_ipv4_and_ipv6_socket(suite) ->
+ [];
+open_multihoming_ipv4_and_ipv6_socket(Config) when is_list(Config) ->
+ ?line case get_addrs_by_family(inet_and_inet6, 2) of
+ {ok, [[InetAddr1, InetAddr2], [Inet6Addr1, Inet6Addr2]]} ->
+ %% Connect to the first address to test bind
+ ?line do_open_and_connect([InetAddr1, Inet6Addr1, InetAddr2],
+ InetAddr1),
+ ?line do_open_and_connect([Inet6Addr1, InetAddr1],
+ Inet6Addr1),
+
+ %% Connect an address, not the first,
+ %% to test sctp_bindx
+ ?line do_open_and_connect([Inet6Addr1, Inet6Addr2, InetAddr1],
+ Inet6Addr2),
+ ?line do_open_and_connect([Inet6Addr1, Inet6Addr2, InetAddr1],
+ InetAddr1);
+ {error, Reason} ->
+ {skip, Reason}
+ end.
+
+
+get_addrs_by_family(Family, NumAddrs) ->
+ case os:type() of
+ {unix,linux} ->
+ get_addrs_by_family_aux(Family, NumAddrs);
+ {unix,freebsd} ->
+ get_addrs_by_family_aux(Family, NumAddrs);
+ {unix,sunos} ->
+ case get_addrs_by_family_aux(Family, NumAddrs) of
+ {ok, [InetAddrs, Inet6Addrs]} when Family =:= inet_and_inet6 ->
+ %% Man page for sctp_bindx on Solaris says: "If sock is an
+ %% Internet Protocol Version 6 (IPv6) socket, addrs should
+ %% be an array of sockaddr_in6 structures containing IPv6
+ %% or IPv4-mapped IPv6 addresses."
+ {ok, [ipv4_map_addrs(InetAddrs), Inet6Addrs]};
+ {ok, Addrs} ->
+ {ok, Addrs};
+ {error, Reason} ->
+ {error, Reason}
+ end;
+ Os ->
+ Reason = if Family =:= inet_and_inet6 ->
+ f("Mixing ipv4 and ipv6 addresses for multihoming "
+ " has not been verified on ~p", [Os]);
+ true ->
+ f("Multihoming for ~p has not been verified on ~p",
+ [Family, Os])
+ end,
+ {error, Reason}
+ end.
+
+get_addrs_by_family_aux(Family, NumAddrs) when Family =:= inet;
+ Family =:= inet6 ->
+ ?line
+ case inet:getaddr(localhost, Family) of
+ {error,eafnosupport} ->
+ {skip, f("No support for ~p", Family)};
+ {ok, _} ->
+ ?line IfAddrs = ok(inet:getifaddrs()),
+ ?line case filter_addrs_by_family(IfAddrs, Family) of
+ Addrs when length(Addrs) >= NumAddrs ->
+ {ok, lists:sublist(Addrs, NumAddrs)};
+ [] ->
+ {error, f("Need ~p ~p address(es) found none~n",
+ [NumAddrs, Family])};
+ Addrs ->
+ {error,
+ f("Need ~p ~p address(es) found only ~p: ~p~n",
+ [NumAddrs, Family, length(Addrs), Addrs])}
+ end
+ end;
+get_addrs_by_family_aux(inet_and_inet6, NumAddrs) ->
+ ?line catch {ok, [case get_addrs_by_family_aux(Family, NumAddrs) of
+ {ok, Addrs} -> Addrs;
+ {error, Reason} -> throw({error, Reason})
+ end || Family <- [inet, inet6]]}.
+
+filter_addrs_by_family(IfAddrs, Family) ->
+ lists:flatten([[Addr || {addr, Addr} <- Info,
+ is_good_addr(Addr, Family)]
+ || {_IfName, Info} <- IfAddrs]).
+
+is_good_addr(Addr, inet) when tuple_size(Addr) =:= 4 ->
+ true;
+is_good_addr({0,0,0,0,0,16#ffff,_,_}, inet6) ->
+ false; %% ipv4 mapped
+is_good_addr({16#fe80,_,_,_,_,_,_,_}, inet6) ->
+ false; %% link-local
+is_good_addr(Addr, inet6) when tuple_size(Addr) =:= 8 ->
+ true;
+is_good_addr(_Addr, _Family) ->
+ false.
+
+ipv4_map_addrs(InetAddrs) ->
+ [begin
+ <<AB:16>> = <<A,B>>,
+ <<CD:16>> = <<C,D>>,
+ {0, 0, 0, 0, 0, 16#ffff, AB, CD}
+ end || {A,B,C,D} <- InetAddrs].
+
+f(F, A) ->
+ lists:flatten(io_lib:format(F, A)).
+
+do_open_and_connect(ServerAddresses, AddressToConnectTo) ->
+ ?line ServerFamily = get_family_by_addrs(ServerAddresses),
+ ?line io:format("Serving ~p addresses: ~p~n",
+ [ServerFamily, ServerAddresses]),
+ ?line S1 = ok(gen_sctp:open(0, [{ip,Addr} || Addr <- ServerAddresses] ++
+ [ServerFamily])),
+ ?line ok = gen_sctp:listen(S1, true),
+ ?line P1 = ok(inet:port(S1)),
+ ?line ClientFamily = get_family_by_addr(AddressToConnectTo),
+ ?line io:format("Connecting to ~p ~p~n",
+ [ClientFamily, AddressToConnectTo]),
+ ?line S2 = ok(gen_sctp:open(0, [ClientFamily])),
+ %% Verify client can connect
+ ?line #sctp_assoc_change{state=comm_up} =
+ ok(gen_sctp:connect(S2, AddressToConnectTo, P1, [])),
+ %% verify server side also receives comm_up from client
+ ?line recv_comm_up_eventually(S1),
+ ?line ok = gen_sctp:close(S2),
+ ?line ok = gen_sctp:close(S1).
+
+%% If at least one of the addresses is an ipv6 address, return inet6, else inet.
+get_family_by_addrs(Addresses) ->
+ ?line case lists:usort([get_family_by_addr(Addr) || Addr <- Addresses]) of
+ [inet, inet6] -> inet6;
+ [inet] -> inet;
+ [inet6] -> inet6
+ end.
+
+get_family_by_addr(Addr) when tuple_size(Addr) =:= 4 -> inet;
+get_family_by_addr(Addr) when tuple_size(Addr) =:= 8 -> inet6.
+
+recv_comm_up_eventually(S) ->
+ ?line case ok(gen_sctp:recv(S)) of
+ {_Addr, _Port, _Info, #sctp_assoc_change{state=comm_up}} ->
+ ok;
+ {_Addr, _Port, _Info, _OtherSctpMsg} ->
+ ?line recv_comm_up_eventually(S)
+ end.
+
%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% socket gen_server ultra light
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