linux-toradex.git/include/net/af_unix.h, branch v5.16-rc5

af_unix: Add unix_stream_proto for sockmap

2021-08-17T01:43:39+00:00

Previously, sockmap for AF_UNIX protocol only supports
dgram type. This patch add unix stream type support, which
is similar to unix_dgram_proto. To support sockmap, dgram
and stream cannot share the same unix_proto anymore, because
they have different implementations, such as unhash for stream
type (which will remove closed or disconnected sockets from the map),
so rename unix_proto to unix_dgram_proto and add a new
unix_stream_proto.

Also implement stream related sockmap functions.
And add dgram key words to those dgram specific functions.

Signed-off-by: Jiang Wang 
Signed-off-by: Andrii Nakryiko 
Reviewed-by: Cong Wang 
Acked-by: Jakub Sitnicki 
Acked-by: John Fastabend 
Link: https://lore.kernel.org/bpf/20210816190327.2739291-3-jiang.wang@bytedance.com

af_unix: Add OOB support

2021-08-04T08:55:52+00:00

This patch adds OOB support for AF_UNIX sockets.
The semantics is same as TCP.

The last byte of a message with the OOB flag is
treated as the OOB byte. The byte is separated into
a skb and a pointer to the skb is stored in unix_sock.
The pointer is used to enforce OOB semantics.

Signed-off-by: Rao Shoaib 
Signed-off-by: David S. Miller

af_unix: Implement unix_dgram_bpf_recvmsg()

2021-07-16T01:17:50+00:00

We have to implement unix_dgram_bpf_recvmsg() to replace the
original ->recvmsg() to retrieve skmsg from ingress_msg.

AF_UNIX is again special here because the lack of
sk_prot->recvmsg(). I simply add a special case inside
unix_dgram_recvmsg() to call sk->sk_prot->recvmsg() directly.

Signed-off-by: Cong Wang 
Signed-off-by: Alexei Starovoitov 
Link: https://lore.kernel.org/bpf/20210704190252.11866-8-xiyou.wangcong@gmail.com

af_unix: Implement ->psock_update_sk_prot()

2021-07-16T01:17:50+00:00

Now we can implement unix_bpf_update_proto() to update
sk_prot, especially prot->close().

Signed-off-by: Cong Wang 
Signed-off-by: Alexei Starovoitov 
Link: https://lore.kernel.org/bpf/20210704190252.11866-7-xiyou.wangcong@gmail.com

unix: uses an atomic type for scm files accounting

2020-02-28T20:12:53+00:00

So the scm_stat_{add,del} helper can be invoked with no
additional lock held.

This clean-up the code a bit and will make the next
patch easier.

Signed-off-by: Paolo Abeni 
Reviewed-by: Kirill Tkhai 
Signed-off-by: David S. Miller

af_unix: Replace zero-length array with flexible-array member

2020-02-28T20:08:37+00:00

The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva 
Signed-off-by: David S. Miller

unix: Show number of pending scm files of receive queue in fdinfo

2019-12-13T01:04:55+00:00

Unix sockets like a block box. You never know what is stored there:
there may be a file descriptor holding a mount or a block device,
or there may be whole universes with namespaces, sockets with receive
queues full of sockets etc.

The patch adds a little debug and accounts number of files (not recursive),
which is in receive queue of a unix socket. Sometimes this is useful
to determine, that socket should be investigated or which task should
be killed to put reference counter on a resourse.

v2: Pass correct argument to lockdep

Signed-off-by: Kirill Tkhai 
Signed-off-by: David S. Miller

net: split out functions related to registering inflight socket files

2019-02-28T15:24:23+00:00

We need this functionality for the io_uring file registration, but
we cannot rely on it since CONFIG_UNIX can be modular. Move the helpers
to a separate file, that's always builtin to the kernel if CONFIG_UNIX is
m/y.

No functional changes in this patch, just moving code around.

Reviewed-by: Hannes Reinecke 
Acked-by: David S. Miller 
Signed-off-by: Jens Axboe

net: drop a space before tabs

2018-10-31T19:37:12+00:00

Fix a warning from checkpatch.pl:'please no space before tabs'
in include/net/af_unix.h

Signed-off-by: Bo YU 
Signed-off-by: David S. Miller

net: add an identifier name for 'struct sock *'

2018-10-31T19:37:12+00:00

Fix a warning from checkpatch:
function definition argument 'struct sock *' should also have an
identifier name in include/net/af_unix.h.

Signed-off-by: Bo YU 
Signed-off-by: David S. Miller