linux-stable.git/include/linux/net.h, branch v5.15.208

splice, net: Add a splice_eof op to file-ops and socket-ops

2025-10-29T13:03:08+00:00

[ Upstream commit 2bfc66850952b6921b2033b09729ec59eabbc81d ]

Add an optional method, ->splice_eof(), to allow splice to indicate the
premature termination of a splice to struct file_operations and struct
proto_ops.

This is called if sendfile() or splice() encounters all of the following
conditions inside splice_direct_to_actor():

 (1) the user did not set SPLICE_F_MORE (splice only), and

 (2) an EOF condition occurred (->splice_read() returned 0), and

 (3) we haven't read enough to fulfill the request (ie. len > 0 still), and

 (4) we have already spliced at least one byte.

A further patch will modify the behaviour of SPLICE_F_MORE to always be
passed to the actor if either the user set it or we haven't yet read
sufficient data to fulfill the request.

Suggested-by: Linus Torvalds 
Link: https://lore.kernel.org/r/CAHk-=wh=V579PDYvkpnTobCLGczbgxpMgGmmhqiTyE34Cpi5Gg@mail.gmail.com/
Signed-off-by: David Howells 
Reviewed-by: Jakub Kicinski 
cc: Jens Axboe 
cc: Christoph Hellwig 
cc: Al Viro 
cc: Matthew Wilcox 
cc: Jan Kara 
cc: Jeff Layton 
cc: David Hildenbrand 
cc: Christian Brauner 
cc: Chuck Lever 
cc: Boris Pismenny 
cc: John Fastabend 
cc: linux-mm@kvack.org
Signed-off-by: Jakub Kicinski 
Stable-dep-of: b014a4e066c5 ("tls: wait for async encrypt in case of error during latter iterations of sendmsg")
Signed-off-by: Sasha Levin

net: remove cmsg restriction from io_uring based send/recvmsg calls

2021-02-24T03:32:11+00:00

No need to restrict these anymore, as the worker threads are direct
clones of the original task. Hence we know for a fact that we can
support anything that the regular task can.

Since the only user of proto_ops->flags was to flag PROTO_CMSG_DATA_ONLY,
kill the member and the flag definition too.

Signed-off-by: Jens Axboe

net: Remove the err argument from sock_from_file

2020-12-04T21:32:40+00:00

Currently, the sock_from_file prototype takes an "err" pointer that is
either not set or set to -ENOTSOCK IFF the returned socket is NULL. This
makes the error redundant and it is ignored by a few callers.

This patch simplifies the API by letting callers deduce the error based
on whether the returned socket is NULL or not.

Suggested-by: Al Viro 
Signed-off-by: Florent Revest 
Signed-off-by: Daniel Borkmann 
Reviewed-by: KP Singh 
Link: https://lore.kernel.org/bpf/20201204113609.1850150-1-revest@google.com

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2020-10-06T01:40:01+00:00

Rejecting non-native endian BTF overlapped with the addition
of support for it.

The rest were more simple overlapping changes, except the
renesas ravb binding update, which had to follow a file
move as well as a YAML conversion.

Signed-off-by: David S. Miller

net: introduce helper sendpage_ok() in include/linux/net.h

2020-10-02T22:27:08+00:00

The original problem was from nvme-over-tcp code, who mistakenly uses
kernel_sendpage() to send pages allocated by __get_free_pages() without
__GFP_COMP flag. Such pages don't have refcount (page_count is 0) on
tail pages, sending them by kernel_sendpage() may trigger a kernel panic
from a corrupted kernel heap, because these pages are incorrectly freed
in network stack as page_count 0 pages.

This patch introduces a helper sendpage_ok(), it returns true if the
checking page,
- is not slab page: PageSlab(page) is false.
- has page refcount: page_count(page) is not zero

All drivers who want to send page to remote end by kernel_sendpage()
may use this helper to check whether the page is OK. If the helper does
not return true, the driver should try other non sendpage method (e.g.
sock_no_sendpage()) to handle the page.

Signed-off-by: Coly Li 
Cc: Chaitanya Kulkarni 
Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Jan Kara 
Cc: Jens Axboe 
Cc: Mikhail Skorzhinskii 
Cc: Philipp Reisner 
Cc: Sagi Grimberg 
Cc: Vlastimil Babka 
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller

io_uring: allow tcp ancillary data for __sys_recvmsg_sock()

2020-08-24T23:16:06+00:00

For TCP tx zero-copy, the kernel notifies the process of completions by
queuing completion notifications on the socket error queue. This patch
allows reading these notifications via recvmsg to support TCP tx
zero-copy.

Ancillary data was originally disallowed due to privilege escalation
via io_uring's offloading of sendmsg() onto a kernel thread with kernel
credentials (https://crbug.com/project-zero/1975). So, we must ensure
that the socket type is one where the ancillary data types that are
delivered on recvmsg are plain data (no file descriptors or values that
are translated based on the identity of the calling process).

This was tested by using io_uring to call recvmsg on the MSG_ERRQUEUE
with tx zero-copy enabled. Before this patch, we received -EINVALID from
this specific code path. After this patch, we could read tcp tx
zero-copy completion notifications from the MSG_ERRQUEUE.

Signed-off-by: Soheil Hassas Yeganeh 
Signed-off-by: Arjun Roy 
Acked-by: Eric Dumazet 
Reviewed-by: Jann Horn 
Reviewed-by: Jens Axboe 
Signed-off-by: Luke Hsiao 
Signed-off-by: David S. Miller

net: pass a sockptr_t into ->setsockopt

2020-07-24T22:41:54+00:00

Rework the remaining setsockopt code to pass a sockptr_t instead of a
plain user pointer.  This removes the last remaining set_fs(KERNEL_DS)
outside of architecture specific code.

Signed-off-by: Christoph Hellwig 
Acked-by: Stefan Schmidt  [ieee802154]
Acked-by: Matthieu Baerts 
Signed-off-by: David S. Miller

net: remove compat_sock_common_{get,set}sockopt

2020-07-20T01:16:40+00:00

Add the compat handling to sock_common_{get,set}sockopt instead,
keyed of in_compat_syscall().  This allow to remove the now unused
->compat_{get,set}sockopt methods from struct proto_ops.

Signed-off-by: Christoph Hellwig 
Acked-by: Matthieu Baerts 
Acked-by: Stefan Schmidt 
Signed-off-by: David S. Miller

dynamic_debug: add an option to enable dynamic debug for modules only

2020-06-08T18:05:56+00:00

Instead of enabling dynamic debug globally with CONFIG_DYNAMIC_DEBUG,
CONFIG_DYNAMIC_DEBUG_CORE will only enable core function of dynamic
debug.  With the DYNAMIC_DEBUG_MODULE defined for any modules, dynamic
debug will be tied to them.

This is useful for people who only want to enable dynamic debug for
kernel modules without worrying about kernel image size and memory
consumption is increasing too much.

[orson.zhai@unisoc.com: v2]
  Link: http://lkml.kernel.org/r/1587408228-10861-1-git-send-email-orson.unisoc@gmail.com

Signed-off-by: Orson Zhai 
Signed-off-by: Andrew Morton 
Acked-by: Greg Kroah-Hartman 
Acked-by: Petr Mladek 
Cc: Jonathan Corbet 
Cc: Sergey Senozhatsky 
Cc: Steven Rostedt 
Cc: Jason Baron 
Cc: Randy Dunlap 
Link: http://lkml.kernel.org/r/1586521984-5890-1-git-send-email-orson.unisoc@gmail.com
Signed-off-by: Linus Torvalds

net: remove kernel_setsockopt

2020-05-29T20:10:39+00:00

No users left.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Marcelo Ricardo Leitner 
Signed-off-by: David S. Miller