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path: root/curvetun/nacl_path.sh
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2013-03-17nacl scripts: include common header and rename build_nacl.shDaniel Borkmann1-5/+9
2013-03-15all: import netsniff-ng 0.5.8-rc0 sourceDaniel Borkmann1-0/+18
t;davem@davemloft.net>2017-02-02 21:58:02 -0500 commitba94f3088b792b16ea576a256a6030feddc87f24 (patch) tree3295b00ebb6ddad72b5fa24c24d6c973598b91b8 parent2a7b6216692cd66f4c94e6ebb48e43038349ca7d (diff)
unix: add ioctl to open a unix socket file with O_PATH
This ioctl opens a file to which a socket is bound and returns a file descriptor. The caller has to have CAP_NET_ADMIN in the socket network namespace. Currently it is impossible to get a path and a mount point for a socket file. socket_diag reports address, device ID and inode number for unix sockets. An address can contain a relative path or a file may be moved somewhere. And these properties say nothing about a mount namespace and a mount point of a socket file. With the introduced ioctl, we can get a path by reading /proc/self/fd/X and get mnt_id from /proc/self/fdinfo/X. In CRIU we are going to use this ioctl to dump and restore unix socket. Here is an example how it can be used: $ strace -e socket,bind,ioctl ./test /tmp/test_sock socket(AF_UNIX, SOCK_STREAM, 0) = 3 bind(3, {sa_family=AF_UNIX, sun_path="test_sock"}, 11) = 0 ioctl(3, SIOCUNIXFILE, 0) = 4 ^Z $ ss -a | grep test_sock u_str LISTEN 0 1 test_sock 17798 * 0 $ ls -l /proc/760/fd/{3,4} lrwx------ 1 root root 64 Feb 1 09:41 3 -> 'socket:[17798]' l--------- 1 root root 64 Feb 1 09:41 4 -> /tmp/test_sock $ cat /proc/760/fdinfo/4 pos: 0 flags: 012000000 mnt_id: 40 $ cat /proc/self/mountinfo | grep "^40\s" 40 19 0:37 / /tmp rw shared:23 - tmpfs tmpfs rw Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat
-rw-r--r--include/uapi/linux/un.h2
-rw-r--r--net/unix/af_unix.c41
2 files changed, 43 insertions, 0 deletions
diff --git a/include/uapi/linux/un.h b/include/uapi/linux/un.h