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criu/include/libnetlink.h

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hdrs: Fixup reinclusion preprocessor constants Make them look like __CR_<smth>_H__ with sed -e '1,2s/#\(ifndef\|define\) _\?_\?\(CR_\)\?/#\1 __CR_/' -e '1,2s/_H_\?_\?.*$/_H__/' on every header file. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-12-24 15:36:14 +04:00
#ifndef __CR_LIBNETLINK_H__
#define __CR_LIBNETLINK_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
net: Define named constant for nlmsg_seq For better readability. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 20:13:18 +04:00
#define CR_NLMSG_SEQ 24680 /* arbitrary chosen */
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 parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
libnetlink: More helpers Add more helpers that manage nla blobs (taken from iproute2 tool). Need for veth support. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-08-10 17:21:34 +04:00
#define parse_rtattr_nested(tb, max, rta) \
(parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
libnetlink: Move the rtnl req routine into libnetlink.c The function that does socket collecting is actually a rtnl request sending one. It will be usefull for netns dump/restore, so move it to generic place. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-08-02 07:23:06 +04:00
extern int do_rtnl_req(int nl, void *req, int size,
nlk: Add error callback to do_rtnl_req In the next patch we will need to care about the exact error reported by the kernel, so add the error callback for this. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2015-01-14 17:28:24 +03:00
int (*receive_callback)(struct nlmsghdr *h, void *),
int (*error_callback)(int err, void *), void *);
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
libnetlink: More helpers Add more helpers that manage nla blobs (taken from iproute2 tool). Need for veth support. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-08-10 17:21:34 +04:00
extern int addattr_l(struct nlmsghdr *n, int maxlen, int type,
const void *data, int alen);
#define NLMSG_TAIL(nmsg) \
((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
headers: Unify include guards (in comments) and a few fixes - fix names in comments - add empty lines where needed - fix rbtree.h - fix syscall-types.h Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-12-25 22:40:24 +04:00
#endif /* __CR_LIBNETLINK_H__ */
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