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criu/include/sockets.h

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net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
#ifndef CR_SOCKETS_H__
#define CR_SOCKETS_H__
Use openat() helper intensively when opening /proc/pid/X files This allows us to get rid of open-coded "/proc/pid/X". Based-on-patch-from: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com>
2012-01-12 23:50:45 +04:00
#include <sys/types.h>
#include <unistd.h>
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
#include <stdbool.h>
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
struct cr_fdset;
sockets: Remove statfs and 2nd stat from dump process The statfs is not required, we now check for fd being a socket with S_IFSOCK. The 2nd stat is just not needed, the caller provides stat info. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-03-29 16:40:10 +04:00
struct fd_parms;
extern int dump_socket(struct fd_parms *p, int lfd,
sockets: Dump socket queus without parasite Since now we have local copies of a remove FDs we can dump socket queus without entering a parasite code. This makes the code MUCH simpler. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-03-29 16:44:15 +04:00
const struct cr_fdset *cr_fdset);
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
files: Rework the way fdinfos are collected Now fdinfos are collected independently from reg files and sockets. During tihs collect we effectively create the mirroring list of both by checking which type-IDs are added first. Fix this by removing the fdinfo_desc and attaching fds directly to collected reg files and sockets. Pipes and unix sockets will be reworked in the same manner soon. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-04-05 12:45:30 +04:00
struct fdinfo_list_entry;
files: Generalize fd restore, introduce file_desc The struct replaces bare list_head on all of the _info-s we've introduced recently. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-04-06 20:03:31 +04:00
struct file_desc;
sockets: Rework unix sockets onto fdinfo scheme This is a big change, yes. Dump unix sockets in the same manner as all the other files are done now. A few notes however. 1. We explicitly drop names for connected stream sockets. This is done to avoid conflicts with names -- accepted sockets share their names with the listening parent. This can be done later by binding a socket to a name, them renaming it to some temporary uniq one and at the very very end renaming some back to original. 2. Interconnected sockets are restored via socketpair() call. This is correct, but names are dropped. Need to bind() sockets after this (yes, this can be done), but for this we need to implement the trick with renames described before. 3. FD for socket queues is constantly re-opened not to resolve fd conflicts. Need to use service fds engine for this later. 4. Some code cleanup is still required, yes (will follow shortly). Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-04-06 19:27:08 +04:00
struct fdinfo_entry;
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
extern int collect_sockets(void);
unix: Cleanup ext socket check Rename the fn and fix indentation. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-04-26 14:20:22 +04:00
extern int fix_external_unix_sockets(void);
inet: Collect inet sockets early on restore Same as previous patch -- pull inet sockets in and store in the hash for the same reasons. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-04-03 00:54:52 +04:00
extern int collect_inet_sockets(void);
sockets: Rework unix sockets onto fdinfo scheme This is a big change, yes. Dump unix sockets in the same manner as all the other files are done now. A few notes however. 1. We explicitly drop names for connected stream sockets. This is done to avoid conflicts with names -- accepted sockets share their names with the listening parent. This can be done later by binding a socket to a name, them renaming it to some temporary uniq one and at the very very end renaming some back to original. 2. Interconnected sockets are restored via socketpair() call. This is correct, but names are dropped. Need to bind() sockets after this (yes, this can be done), but for this we need to implement the trick with renames described before. 3. FD for socket queues is constantly re-opened not to resolve fd conflicts. Need to use service fds engine for this later. 4. Some code cleanup is still required, yes (will follow shortly). Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-04-06 19:27:08 +04:00
extern int collect_unix_sockets(void);
extern int resolve_unix_peers(void);
extern int run_unix_connections(void);
show: Introduce ->show callback for fdset Each fdset item now has the callback which will show a contents of a magic-described image file. Per-task and global show code is reworked to walk the respective fdsets and calling ->show on each file. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-03-27 12:01:14 +04:00
struct cr_options;
extern void show_unixsk(int fd, struct cr_options *);
extern void show_inetsk(int fd, struct cr_options *);
extern void show_sk_queues(int fd, struct cr_options *);
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
#endif /* CR_SOCKETS_H__ */
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