On 06 Apr 2014, at 11:42 , Michael Tuexen <michael.tue...@lurchi.franken.de>
wrote:
> On 05 Apr 2014, at 23:02, Bernd Walter <ti...@cicely7.cicely.de> wrote:
>
>> 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.
>>
>> 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.
>
> 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.
>
> Best regards
> Michael
>>
>> This is the relevant C++ code part to open the socket:
>> int
>> setup_sctp_socket(uint16_t port)
>> {
>> int sc = socket(AF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP);
>> {
>> // reuse address
>> long val = 1;
>> setsockopt(sc, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
>> // XXX error handling
>> }
>> {
>> // no delay
>> long val = 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 = 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 = HDB_STREAMS;
>> init.sinit_max_instreams = 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 = sizeof(addr);
>> addr.sin6_family = AF_INET6;
>> addr.sin6_port = 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 = AF_INET6;
>> paddr_params.spp_flags = SPP_HB_ENABLE;
>> paddr_params.spp_hbinterval = 1000;
>> // SOL_SCTP instead of IPPROTO_SCTP on Linux
>> setsockopt(sc, IPPROTO_SCTP, SCTP_PEER_ADDR_PARAMS,
>> &paddr_params, sizeof(paddr_params));
>> // XXX error handling
>> }
>> {
>> struct sctp_event_subscribe events;
>> bzero(&events, sizeof(events));
>>
>> events.sctp_data_io_event = 1; // we need io_events to know
>> where the message came from
>>
>> // subscribe to other events as well for testing
>> events.sctp_association_event = 1;
>> events.sctp_address_event = 1;
>> events.sctp_send_failure_event = 1;
>> events.sctp_peer_error_event = 1;
>> events.sctp_shutdown_event = 1;
>> events.sctp_partial_delivery_event = 1;
>> events.sctp_adaptation_layer_event = 1;
>> events.sctp_authentication_event = 1;
>> events.sctp_sender_dry_event = 1;
>> events.sctp_stream_reset_event = 1;
>>
>> 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 = 1864135;
>> setsockopt(sc, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val));
>> // XXX error handling
>> val = 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
>>
>> return sc;
>> }
>>
>> --
>> B.Walter <be...@bwct.de> http://www.bwct.de
>> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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>
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