Sockets - Revision history

Xemul at 10:16, 21 September 2016

2016-09-21T10:16:09Z

2016-09-21T10:13:12Z

2015-02-26T15:48:43Z

categorized

2014-12-01T11:18:07Z

2013-05-14T21:14:37Z

2013-05-14T21:13:15Z

Link to tcp connection

2013-05-14T21:12:41Z

Fix what sockets are supportred

2013-05-14T21:10:57Z

Categorize

2012-10-21T19:09:03Z

What should be done next

2012-01-13T20:01:33Z

dgram sockets are supported

@@ Line 17: / Line 17: @@
 [[Category:Under the hood]]
 [[Category:Files]]
-[[Category:Network]]
+[[Category:Sockets]]

@@ Line 1: / Line 1: @@
 == Unix sockets initial support ==
-Currently we support Unix socket of all kinds, UDP both IPv4 and IPv6 and TCP in Listen and (!) [[TCP connection|Established states]].
+Currently we support Unix socket of all kinds, UDP both IPv4 and IPv6, TCP in Listen and (!) [[TCP connection|Established states]] and Netlink ones.
-The cpt part uses the sock_diag engine to collect extended information about socket. Then it drains sockets from the target tasks using SCM_RIGHTS sending.
+The cpt part uses the sock_diag engine to collect extended information about socket, then CRIU uses the files dumping engine to get access to sockets state.
 The restore part of Unix sockets is the most tricky part. Listen sockets are just restored, this is simple.

@@ Line 3: / Line 3: @@
 Currently we support Unix socket of all kinds, UDP both IPv4 and IPv6 and TCP in Listen and (!) [[TCP connection|Established states]].
-The cpt part uses the sock_diag engine that was merged to Dave recently to
+The cpt part uses the sock_diag engine to collect extended information about socket. Then it drains sockets from the target tasks using SCM_RIGHTS sending.
-The restore part is more tricky. Listen sockets are just restored, this is simple.
+The restore part of Unix sockets is the most tricky part. Listen sockets are just restored, this is simple.
 Connected sockets are restored like this:
@@ Line 16: / Line 13: @@
 # ... all listening sockets call accept() and ... dup2 the new fd into the accepting end.
-There's a problem with this approach -- socket names are not preserved, but
+There's a problem with this approach -- socket names are not preserved, but looking into our OpenVZ implementation I think this is OK for existing apps.
 [[Category:Under the hood]]

← Older revision		Revision as of 21:10, 14 May 2013
Line 25:		Line 25:
	* socket filter (SK_ATTACH_FILTER)		* socket filter (SK_ATTACH_FILTER)
	* various (ip/tcp level) sockoptions		* various (ip/tcp level) sockoptions
		+
		+	[[Category:Under the hood]]

@@ Line 23: / Line 23: @@
 === What should be done next ===
-* Need to merge the file IDs patches in our tree and make Andrey to support files sharing. This will solve the
+* socket filter (SK_ATTACH_FILTER)
+* various (ip/tcp level) sockoptions

@@ Line 1: / Line 1: @@
 == Unix sockets initial support ==
-Currently it can only work with stream sockets, which have no skbs in queues
+Currently it can only work with stream and dgram sockets, which have no skbs in queues
 (listening or established -- both work OK). If there are skbs in queue the dumping
 procedure will fail.
@@ Line 31: / Line 31: @@
 case. Currently it simply doesn't work :(
 * Need to add support for in-flight connections
 * Implement support for UDP sockets (quite simple)
 * Implement support for listening TCP sockets (also not very complex)
 * Implement support for connected TCP scokets (hard one)