Date: Sun, 6 Apr 2014 15:05:50 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Michael Tuexen <Michael.Tuexen@lurchi.franken.de> Cc: FreeBSD Net <freebsd-net@freebsd.org>, Bernd Walter <ticso@cicely7.cicely.de>, ticso@cicely.de Subject: Re: SCTP binds to IPs outside of jail Message-ID: <77B6DEC1-D7E8-446E-A057-A692379D9EFB@lists.zabbadoz.net> In-Reply-To: <7D1ABA78-D48D-48B7-9CE7-152BD59DB1B0@lurchi.franken.de> References: <20140405210246.GB58138@cicely7.cicely.de> <7D1ABA78-D48D-48B7-9CE7-152BD59DB1B0@lurchi.franken.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On 06 Apr 2014, at 11:42 , Michael Tuexen =
<Michael.Tuexen@lurchi.franken.de> wrote:
> On 05 Apr 2014, at 23:02, Bernd Walter <ticso@cicely7.cicely.de> =
wrote:
>=20
>> So far I've tested this on FreeBSD-9.2 BETA2 r254053M only.
>> The modifications are to allow IPv6 multicast support within jail
>> which only makes a difference for multicast addresses and some =
multicast
>> loopback checksum bugs - both changes are open PR.
>>=20
>> I've created an AF_INET6 SCTP one to many socket to receive incoming
>> messages.
>> The process was started within a jail.
>> Now netstat -anW lists all host IPv6 IPs, not just those of the jail.
>> Also not sure why this AF_INET6 socket is shown as sctp46.
> This should be handled as a v6 only socket depending on your
> setting of net.inet6.ip6.v6only sysctl variable by the SCTP stack.
> However, netstat has no information about this and can not distinguish
> between sctp6 and sctp46, so it reports sctp46 always. You can file
> a PR about this.
>=20
> The questions about the addresses and the jails: The SCTP code has
> no jail specific code. If you bind a socket to the wildcard address
> (which is what to do by not binding at all), the SCTP stack lists
> all addresses it know about. I'm not sure what would happen, if
> you send a packet to an address not owned by the jail.
> You might want to file a separate PR about the support of jails.
Aehm, the SCTP code was filtering addresses at one point and made sure =
only jail-visible addresses were seen or bound very much like normal PCB =
handling. If this is not the case (anymore) SCTP shall not be allowed =
inside jails again.=20
>=20
> Best regards
> Michael
>>=20
>> This is the relevant C++ code part to open the socket:
>> int
>> setup_sctp_socket(uint16_t port)
>> {
>> int sc =3D socket(AF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP);
>> {
>> // reuse address
>> long val =3D 1;
>> setsockopt(sc, SOL_SOCKET, SO_REUSEADDR, &val, =
sizeof(val));
>> // XXX error handling
>> }
>> {
>> // no delay
>> long val =3D 1;
>> setsockopt(sc, SOL_SOCKET, SCTP_NODELAY, &val, =
sizeof(val));
>> // XXX error handling
>> }
>> {
>> // eeor mode (last write needs MSG_EOR to declare end =
of message)
>> // Linux has MSG_MORE negative send flag
>> long val =3D 1;
>> setsockopt(sc, SOL_SOCKET, SCTP_EXPLICIT_EOR, &val, =
sizeof(val));
>> // XXX error handling
>> }
>> #if 0
>> {
>> struct sctp_initmsg init;
>> bzero(&init, sizeof(init));
>> init.sinit_num_ostreams =3D HDB_STREAMS;
>> init.sinit_max_instreams =3D HDB_STREAMS;
>> // SOL_SCTP instead of IPPROTO_SCTP on Linux
>> setsockopt(sc, IPPROTO_SCTP, SCTP_INITMSG, &init, =
(socklen_t)sizeof(struct sctp_initmsg));
>> // XXX error handling
>> }
>> #endif
>> {
>> struct sockaddr_in6 addr;
>> bzero(&addr, sizeof(addr));
>> addr.sin6_len =3D sizeof(addr);
>> addr.sin6_family =3D AF_INET6;
>> addr.sin6_port =3D htons(port);
>> bind(sc, (struct sockaddr *)&addr, sizeof(struct =
sockaddr_in));
>> // XXX error handling
>> }
>> {
>> // enable heartbeats at 1000ms
>> struct sctp_paddrparams paddr_params;
>> bzero(&paddr_params, sizeof(paddr_params));
>> paddr_params.spp_address.ss_family =3D AF_INET6;
>> paddr_params.spp_flags =3D SPP_HB_ENABLE;
>> paddr_params.spp_hbinterval =3D 1000;
>> // SOL_SCTP instead of IPPROTO_SCTP on Linux
>> setsockopt(sc, IPPROTO_SCTP, SCTP_PEER_ADDR_PARAMS, =
&paddr_params, sizeof(paddr_params));=20
>> // XXX error handling
>> }
>> {
>> struct sctp_event_subscribe events;
>> bzero(&events, sizeof(events));
>>=20
>> events.sctp_data_io_event =3D 1; // we need io_events =
to know where the message came from
>>=20
>> // subscribe to other events as well for testing
>> events.sctp_association_event =3D 1;
>> events.sctp_address_event =3D 1;
>> events.sctp_send_failure_event =3D 1;
>> events.sctp_peer_error_event =3D 1;
>> events.sctp_shutdown_event =3D 1;
>> events.sctp_partial_delivery_event =3D 1;
>> events.sctp_adaptation_layer_event =3D 1;
>> events.sctp_authentication_event =3D 1;
>> events.sctp_sender_dry_event =3D 1;
>> events.sctp_stream_reset_event =3D 1;
>>=20
>> setsockopt(sc, IPPROTO_SCTP, SCTP_EVENTS, &events, =
sizeof(events));
>> // XXX error handling
>> }
>> {
>> // setup send and receive buffers (default on FreeBSD =
9.x)
>> long val;
>> val =3D 1864135;
>> setsockopt(sc, SOL_SOCKET, SO_RCVBUF, &val, =
sizeof(val));
>> // XXX error handling
>> val =3D 1864135;
>> setsockopt(sc, SOL_SOCKET, SO_SNDBUF, &val, =
sizeof(val));
>> // XXX error handling
>> }
>> listen (sc, 1); // listen is required to allow incoming =
associations, but no listen queue
>> // XXX error handling
>>=20
>> return sc;
>> }
>>=20
>> --=20
>> B.Walter <bernd@bwct.de> http://www.bwct.de
>> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
>> _______________________________________________
>> freebsd-net@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-net
>> To unsubscribe, send any mail to =
"freebsd-net-unsubscribe@freebsd.org"
>>=20
>=20
> _______________________________________________
> freebsd-net@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
=97=20
Bjoern A. Zeeb ????????? ??? ??????? ??????:
'??? ??? ???? ?????? ??????? ?? ?? ??????? ??????? ??? ????? ????? ????
?????? ?? ????? ????', ????????? ?????????, "??? ????? ?? ?????", ?.???
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?77B6DEC1-D7E8-446E-A057-A692379D9EFB>