criu/include/unix_diag.h

#ifndef __UNIX_DIAG_H__
#define __UNIX_DIAG_H__

struct unix_diag_req {
	__u8	sdiag_family;
	__u8	sdiag_protocol;
	__u16	pad;
	__u32	udiag_states;
	__u32	udiag_ino;
	__u32	udiag_show;
	__u32	udiag_cookie[2];
};

#define UDIAG_SHOW_NAME		0x00000001	/* show name (not path) */
#define UDIAG_SHOW_VFS		0x00000002	/* show VFS inode info */
#define UDIAG_SHOW_PEER		0x00000004	/* show peer socket info */
#define UDIAG_SHOW_ICONS	0x00000008	/* show pending connections */
#define UDIAG_SHOW_RQLEN	0x00000010	/* show skb receive queue len */

struct unix_diag_msg {
	__u8	udiag_family;
	__u8	udiag_type;
	__u8	udiag_state;
	__u8	pad;

	__u32	udiag_ino;
	__u32	udiag_cookie[2];
};

enum {
	UNIX_DIAG_NAME,
	UNIX_DIAG_VFS,
	UNIX_DIAG_PEER,
	UNIX_DIAG_ICONS,
	UNIX_DIAG_RQLEN,

	UNIX_DIAG_MAX,
};

struct unix_diag_vfs {
	__u32	udiag_vfs_ino;
	__u32	udiag_vfs_dev;
};

#endif
Unix sockets initial support Currently it can only work with stream sockets, which have no skbs in queues (listening or established -- both work OK). The cpt part uses the sock_diag engine that was merged to Dave recently to collect sockets. Then it dumps sockets by checking the filesystem ID of a failed-to-open through /proc/pid/fd descriptors (sockets do not allow for such tricks with opens through proc) against SOCKFS_TYPE. The rst part is more tricky. Listen sockets are just restored, this is simple. Connected sockets are restored like this: 1. One end establishes a listening anon socket at the desired descriptor; 2. The other end just creates a socket at the desired descriptor; 3. All sockets, that are to be connect()-ed call connect. Unix sockets do not block connect() till the accept() time and thus we continue with... 4. ... 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 looking into our OpenVZ implementation I think this is OK for existing apps. What should be done next is: 1. Need to merge the file IDs patches in our tree and make Andrey to support files sharing. This will solve the sk = socket(); fork(); case. Currently it simply doesn't work :( 2. Need to add support for DGRAM sockets -- I wrote comment how to do it in the can_dump_unix_sk() 3. Need to add support for in-flight connections 4. Implement support for UDP sockets (quite simple) 5. Implement support for listening TCP sockets (also not very complex) 6. Implement support for connected TCP scokets (hard one, Tejun's patches are not very good for this from my POV) Cyrill, plz, apply this patch and put the above descriptions onto wiki docs (do we have the plans page yet?). Andrey, plz, take care of unix sockets tests in zdtm. Most likely it won't work till you do the shared files support for sockets. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> 2011-12-26 22:12:03 +04:00			`#ifndef __UNIX_DIAG_H__`
			`#define __UNIX_DIAG_H__`

			`struct unix_diag_req {`
			`__u8 sdiag_family;`
			`__u8 sdiag_protocol;`
			`__u16 pad;`
			`__u32 udiag_states;`
			`__u32 udiag_ino;`
			`__u32 udiag_show;`
			`__u32 udiag_cookie[2];`
			`};`

			`#define UDIAG_SHOW_NAME 0x00000001 /* show name (not path) */`
			`#define UDIAG_SHOW_VFS 0x00000002 /* show VFS inode info */`
			`#define UDIAG_SHOW_PEER 0x00000004 /* show peer socket info */`
			`#define UDIAG_SHOW_ICONS 0x00000008 /* show pending connections */`
			`#define UDIAG_SHOW_RQLEN 0x00000010 /* show skb receive queue len */`

			`struct unix_diag_msg {`
			`__u8 udiag_family;`
			`__u8 udiag_type;`
			`__u8 udiag_state;`
			`__u8 pad;`

			`__u32 udiag_ino;`
			`__u32 udiag_cookie[2];`
			`};`

			`enum {`
			`UNIX_DIAG_NAME,`
			`UNIX_DIAG_VFS,`
			`UNIX_DIAG_PEER,`
			`UNIX_DIAG_ICONS,`
			`UNIX_DIAG_RQLEN,`

			`UNIX_DIAG_MAX,`
			`};`

			`struct unix_diag_vfs {`
			`__u32 udiag_vfs_ino;`
			`__u32 udiag_vfs_dev;`
			`};`

			`#endif`