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authorRaimo Niskanen <[email protected]>2018-07-06 12:55:10 +0200
committerRaimo Niskanen <[email protected]>2018-09-04 10:43:24 +0200
commit64853dc28ce838583e35d5fefb0604933b6e98f9 (patch)
tree94cf435f2c42f197b341dc0331df26189d7e29b5 /lib/kernel/doc/src/gen_sctp.xml
parent487f0c12e8700d31161a3bbb9c36e360aff484ac (diff)
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Implement socket option recvtos and friends
Implement socket options recvtclass, recvtos, recvttl and pktoptions. Document the implemented socket options, new types and message formats. The options recvtclass, recvtos and recvttl are boolean options that when activated (true) for a socket will cause ancillary data to be received through recvmsg(). That is for packet oriented sockets (UDP and SCTP). The required options for this feature were recvtclass and recvtos, and recvttl was only added to test that the ancillary data parsing handled multiple data items in one message correctly. These options does not work on Windows since ancillary data is not handled by the Winsock2 API. For stream sockets (TCP) there is no clear connection between a received packet and what is returned when reading data from the socket, so recvmsg() is not useful. It is possible to get the same ancillary data through a getsockopt() call with the IPv6 socket option IPV6_PKTOPTIONS, on Linux named IPV6_2292PKTOPTIONS after the now obsoleted RFC where it originated. (unfortunately RFC 3542 that obsoletes it explicitly undefines this way to get packet ancillary data from a stream socket) Linux also has got a way to get packet ancillary data for IPv4 TCP sockets through a getsockopt() call with IP_PKTOPTIONS, which appears to be Linux specific. This implementation uses a flag field in the inet_drv.c socket internal data that records if any setsockopt() call with recvtclass, recvtos or recvttl (IPV6_RECVTCLASS, IP_RECVTOS or IP_RECVTTL) has been activated. If so recvmsg() is used instead of recvfrom(). Ancillary data is delivered to the application by a new return tuple format from gen_udp:recv/2,3 containing a list of ancillary data tuples [{tclass,TCLASS} | {tos,TOS} | {ttl,TTL}], as returned by recvmsg(). For a socket in active mode a new message format, containing the ancillary data list, delivers the data in the same way. For gen_sctp the ancillary data is delivered in the same way, except that the gen_sctp return tuple format already contained an ancillary data list so there are just more possible elements when using these socket options. Note that the active mode message format has got an extra tuple level for the ancillary data compared to what is now implemented gen_udp. The gen_sctp active mode format was considered to be the odd one - now all tuples containing ancillary data are flat, except for gen_sctp active mode. Note that testing has not shown that Linux SCTP sockets deliver any ancillary data for these socket options, so it is probably not implemented yet. Remains to be seen what FreeBSD does... For gen_tcp inet:getopts([pktoptions]) will deliver the latest received ancillary data for any activated socket option recvtclass, recvtos or recvttl, on platforms where IP_PKTOPTIONS is defined for an IPv4 socket, or where IPV6_PKTOPTIONS or IPV6_2292PKTOPTIONS is defined for an IPv6 socket. It will be delivered as a list of ancillary data items in the same way as for gen_udp (and gen_sctp). On some platforms, e.g the BSD:s, when you activate IP_RECVTOS you get ancillary data tagged IP_RECVTOS with the TOS value, but on Linux you get ancillary data tagged IP_TOS with the TOS value. Linux follows the style of RFC 2292, and the BSD:s use an older notion. For RFC 2292 that defines the IP_PKTOPTIONS socket option it is more logical to tag the items with the tag that is the item's, than with the tag that defines that you want the item. Therefore this implementation translates all BSD style ancillary data tags to the corresponding Linux style data tags, so the application will only see the tags 'tclass', 'tos' and 'ttl' on all platforms.
Diffstat (limited to 'lib/kernel/doc/src/gen_sctp.xml')
-rw-r--r--lib/kernel/doc/src/gen_sctp.xml69
1 files changed, 63 insertions, 6 deletions
diff --git a/lib/kernel/doc/src/gen_sctp.xml b/lib/kernel/doc/src/gen_sctp.xml
index 737800c6b1..1e08b25f66 100644
--- a/lib/kernel/doc/src/gen_sctp.xml
+++ b/lib/kernel/doc/src/gen_sctp.xml
@@ -4,7 +4,7 @@
<erlref>
<header>
<copyright>
- <year>2007</year><year>2016</year>
+ <year>2007</year><year>2018</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -331,6 +331,37 @@ connect(Socket, Ip, Port>,
with <anno>SockType</anno> <c>seqpacket</c>, and with reasonably large
<seealso marker="inet#option-sndbuf">kernel</seealso> and driver
<seealso marker="inet#option-buffer">buffers</seealso>.</p>
+ <p>
+ If the socket is in
+ <seealso marker="#option-active">passive</seealso>
+ mode data can be received through the
+ <seealso marker="#recv/1"><c>recv/1,2</c></seealso>
+ calls.
+ </p>
+ <p>
+ If the socket is in
+ <seealso marker="#option-active">active</seealso>
+ mode data received data is delivered to the controlling process
+ as messages:
+ </p>
+ <code type="none">
+{sctp, <anno>Socket</anno>, FromIP, FromPort, {AncData, Data}}
+ </code>
+ <p>
+ See
+ <seealso marker="#recv/1"><c>recv/1,2</c></seealso>
+ for a description of the message fields.
+ </p>
+ <note>
+ <p>
+ This message format unfortunately differs slightly from the
+ <seealso marker="gen_udp#open/1"><c>gen_udp</c></seealso>
+ message format with ancillary data,
+ and from the
+ <seealso marker="#recv/1"><c>recv/1,2</c></seealso>
+ return tuple format.
+ </p>
+ </note>
</desc>
</func>
@@ -380,6 +411,19 @@ connect(Socket, Ip, Port>,
socket option
<seealso marker="#option-sctp_get_peer_addr_info"><c>sctp_get_peer_addr_info</c></seealso>,
but this does still not produce the stream number).</p>
+ <p>
+ <c><anno>AncData</anno></c> may also contain
+ <seealso marker="inet#type-ancillary_data">
+ ancillary data
+ </seealso>
+ from the socket
+ <seealso marker="#type-option">options</seealso>
+ <seealso marker="inet#option-recvtos"><c>recvtos</c></seealso>,
+ <seealso marker="inet#option-recvtclass"><c>recvtclass</c></seealso>
+ or
+ <seealso marker="inet#option-recvttl"><c>recvttl</c></seealso>,
+ if that is supported by the platform for the socket.
+ </p>
<p>The <c><anno>Data</anno></c> received can be a <c>binary()</c>
or a <c>list()</c> of bytes (integers in the range 0 through 255)
depending on the socket mode, or an SCTP event.</p>
@@ -544,12 +588,25 @@ connect(Socket, Ip, Port>,
<seealso marker="#recv/1"><c>recv</c></seealso> call
to retrieve the available data from the socket.</p>
</item>
+ <item>
+ <p>
+ If <c>true|once|N</c> (active modes)
+ received data or events are sent to the owning process.
+ See <seealso marker="#open/0"><c>open/0..2</c></seealso>
+ for the message format.
+ </p>
+ </item>
<item>
- <p>If <c>true</c> (full active mode), the pending data or events are
- sent to the owning process.</p>
- <p>Notice that this can cause the message queue to overflow,
- as there is no way to throttle the sender in this case
- (no flow control).</p>
+ <p>
+ If <c>true</c> (full active mode) there is no flow control.
+ </p>
+ <note>
+ <p>
+ Note that this can cause the message queue to overflow
+ causing for example the virtual machine
+ to run out of memory and crash.
+ </p>
+ </note>
</item>
<item>
<p>If <c>once</c>, only one message is automatically placed