selftests: net: Add kernel selftest for RFC 4884

RFC 4884 extended certain ICMP messages with a length attribute that
encodes the length of the "original datagram" field. This is needed so
that new

selftests: net: Add kernel selftest for RFC 4884

RFC 4884 extended certain ICMP messages with a length attribute that
encodes the length of the "original datagram" field. This is needed so
that new information could be appended to these messages without
applications thinking that it is part of the "original datagram" field.

In version 5.9, the kernel was extended with two new socket options
(SOL_IP/IP_RECVERR_4884 and SOL_IPV6/IPV6_RECVERR_RFC4884) that allow
user space to retrieve this length which is basically the offset to the
ICMP Extension Structure at the end of the ICMP message. This is
required by user space applications that need to parse the information
contained in the ICMP Extension Structure. For example, the RFC 5837
extension for tracepath.

Add a selftest that verifies correct handling of the RFC 4884 length
field for both IPv4 and IPv6, with and without extension structures,
and validates that malformed extensions are correctly reported as invalid.

For each address family, the test creates:
- a raw socket used to send locally crafted ICMP error packets to the
loopback address, and
- a datagram socket used to receive the encapsulated original datagram
and associated error metadata from the kernel error queue.

ICMP packets are constructed entirely in user space rather than relying
on kernel-generated errors. This allows the test to exercise invalid
scenarios (such as corrupted checksums and incorrect length fields) and
verify that the SO_EE_RFC4884_FLAG_INVALID flag is set as expected.

Output Example:

$ ./icmp_rfc4884
Starting 18 tests from 18 test cases.
RUN rfc4884.ipv4_ext_small_payload.rfc4884 ...
OK rfc4884.ipv4_ext_small_payload.rfc4884
ok 1 rfc4884.ipv4_ext_small_payload.rfc4884
RUN rfc4884.ipv4_ext.rfc4884 ...
OK rfc4884.ipv4_ext.rfc4884
ok 2 rfc4884.ipv4_ext.rfc4884
RUN rfc4884.ipv4_ext_large_payload.rfc4884 ...
OK rfc4884.ipv4_ext_large_payload.rfc4884
ok 3 rfc4884.ipv4_ext_large_payload.rfc4884
RUN rfc4884.ipv4_no_ext_small_payload.rfc4884 ...
OK rfc4884.ipv4_no_ext_small_payload.rfc4884
ok 4 rfc4884.ipv4_no_ext_small_payload.rfc4884
RUN rfc4884.ipv4_no_ext_min_payload.rfc4884 ...
OK rfc4884.ipv4_no_ext_min_payload.rfc4884
ok 5 rfc4884.ipv4_no_ext_min_payload.rfc4884
RUN rfc4884.ipv4_no_ext_large_payload.rfc4884 ...
OK rfc4884.ipv4_no_ext_large_payload.rfc4884
ok 6 rfc4884.ipv4_no_ext_large_payload.rfc4884
RUN rfc4884.ipv4_invalid_ext_checksum.rfc4884 ...
OK rfc4884.ipv4_invalid_ext_checksum.rfc4884
ok 7 rfc4884.ipv4_invalid_ext_checksum.rfc4884
RUN rfc4884.ipv4_invalid_ext_length_small.rfc4884 ...
OK rfc4884.ipv4_invalid_ext_length_small.rfc4884
ok 8 rfc4884.ipv4_invalid_ext_length_small.rfc4884
RUN rfc4884.ipv4_invalid_ext_length_large.rfc4884 ...
OK rfc4884.ipv4_invalid_ext_length_large.rfc4884
ok 9 rfc4884.ipv4_invalid_ext_length_large.rfc4884
RUN rfc4884.ipv6_ext_small_payload.rfc4884 ...
OK rfc4884.ipv6_ext_small_payload.rfc4884
ok 10 rfc4884.ipv6_ext_small_payload.rfc4884
RUN rfc4884.ipv6_ext.rfc4884 ...
OK rfc4884.ipv6_ext.rfc4884
ok 11 rfc4884.ipv6_ext.rfc4884
RUN rfc4884.ipv6_ext_large_payload.rfc4884 ...
OK rfc4884.ipv6_ext_large_payload.rfc4884
ok 12 rfc4884.ipv6_ext_large_payload.rfc4884
RUN rfc4884.ipv6_no_ext_small_payload.rfc4884 ...
OK rfc4884.ipv6_no_ext_small_payload.rfc4884
ok 13 rfc4884.ipv6_no_ext_small_payload.rfc4884
RUN rfc4884.ipv6_no_ext_min_payload.rfc4884 ...
OK rfc4884.ipv6_no_ext_min_payload.rfc4884
ok 14 rfc4884.ipv6_no_ext_min_payload.rfc4884
RUN rfc4884.ipv6_no_ext_large_payload.rfc4884 ...
OK rfc4884.ipv6_no_ext_large_payload.rfc4884
ok 15 rfc4884.ipv6_no_ext_large_payload.rfc4884
RUN rfc4884.ipv6_invalid_ext_checksum.rfc4884 ...
OK rfc4884.ipv6_invalid_ext_checksum.rfc4884
ok 16 rfc4884.ipv6_invalid_ext_checksum.rfc4884
RUN rfc4884.ipv6_invalid_ext_length_small.rfc4884 ...
OK rfc4884.ipv6_invalid_ext_length_small.rfc4884
ok 17 rfc4884.ipv6_invalid_ext_length_small.rfc4884
RUN rfc4884.ipv6_invalid_ext_length_large.rfc4884 ...
OK rfc4884.ipv6_invalid_ext_length_large.rfc4884
ok 18 rfc4884.ipv6_invalid_ext_length_large.rfc4884
PASSED: 18 / 18 tests passed.
Totals: pass:18 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260121114644.2863640-1-danieller@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftest: af_unix: Create its own .gitignore.

Somehow AF_UNIX tests have reused ../.gitignore,
but now NIPA warns about it.

Let's create .gitignore under af_unix/.

Signed-off-by: Kuniyuki Iwashima

selftest: af_unix: Create its own .gitignore.

Somehow AF_UNIX tests have reused ../.gitignore,
but now NIPA warns about it.

Let's create .gitignore under af_unix/.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20251124212805.486235-2-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: net: relocate gro and toeplitz tests to drivers/net

The GRO test can run on a real device or a veth.
The Toeplitz hash test can only run on a real device.
Move them from net/ to drivers/n

selftests: net: relocate gro and toeplitz tests to drivers/net

The GRO test can run on a real device or a veth.
The Toeplitz hash test can only run on a real device.
Move them from net/ to drivers/net/ and drivers/net/hw/ respectively.

There are two scripts which set up the environment for these tests
setup_loopback.sh and setup_veth.sh. Move those scripts to net/lib.
The paths to the setup files are a little ugly but they will be
deleted shortly.

toeplitz_client.sh is not a test in itself, but rather a helper
to send traffic, so add it to TEST_FILES rather than TEST_PROGS.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20251120021024.2944527-6-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

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

Cross-merge networking fixes after downstream PR (net-6.18-rc7).

No conflicts, adjacent changes:

tools/testing/selftests/net/af_unix/

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

Cross-merge networking fixes after downstream PR (net-6.18-rc7).

No conflicts, adjacent changes:

tools/testing/selftests/net/af_unix/Makefile
e1bb28bf13f4 ("selftest: af_unix: Add test for SO_PEEK_OFF.")
45a1cd8346ca ("selftests: af_unix: Add tests for ECONNRESET and EOF semantics")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftest: af_unix: Add test for SO_PEEK_OFF.

The test covers various cases to verify SO_PEEK_OFF behaviour
for all AF_UNIX socket types.

two_chunks_blocking and two_chunks_overlap_blocking reproduc

selftest: af_unix: Add test for SO_PEEK_OFF.

The test covers various cases to verify SO_PEEK_OFF behaviour
for all AF_UNIX socket types.

two_chunks_blocking and two_chunks_overlap_blocking reproduce
the issue mentioned in the previous patch.

Without the patch, the two tests fail:

# RUN so_peek_off.stream.two_chunks_blocking ...
# so_peek_off.c:121:two_chunks_blocking:Expected 'bbbb' == 'aaaabbbb'.
# two_chunks_blocking: Test terminated by assertion
# FAIL so_peek_off.stream.two_chunks_blocking
not ok 3 so_peek_off.stream.two_chunks_blocking

# RUN so_peek_off.stream.two_chunks_overlap_blocking ...
# so_peek_off.c:159:two_chunks_overlap_blocking:Expected 'bbbb' == 'aaaabbbb'.
# two_chunks_overlap_blocking: Test terminated by assertion
# FAIL so_peek_off.stream.two_chunks_overlap_blocking
not ok 5 so_peek_off.stream.two_chunks_overlap_blocking

With the patch, all tests pass:

# PASSED: 15 / 15 tests passed.
# Totals: pass:15 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20251117174740.3684604-3-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: af_unix: Add tests for ECONNRESET and EOF semantics

Add selftests to verify and document Linux’s intended behaviour for
UNIX domain sockets (SOCK_STREAM and SOCK_DGRAM) when a peer closes

selftests: af_unix: Add tests for ECONNRESET and EOF semantics

Add selftests to verify and document Linux’s intended behaviour for
UNIX domain sockets (SOCK_STREAM and SOCK_DGRAM) when a peer closes.
The tests verify that:

1. SOCK_STREAM returns EOF when the peer closes normally.
2. SOCK_STREAM returns ECONNRESET if the peer closes with unread data.
3. SOCK_SEQPACKET returns EOF when the peer closes normally.
4. SOCK_SEQPACKET returns ECONNRESET if the peer closes with unread data.
5. SOCK_DGRAM does not return ECONNRESET when the peer closes.

This follows up on review feedback suggesting a selftest to clarify
Linux’s semantics.

Suggested-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: Sunday Adelodun <adelodunolaoluwa@yahoo.com>
Link: https://patch.msgid.link/20251113112802.44657-1-adelodunolaoluwa@yahoo.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

show more ...

selftests/net: add tcp_port_share to .gitignore

Add the tcp_port_share test binary to .gitignore to avoid
accidentally staging the build artifact.

Signed-off-by: Gopi Krishna Menon <krishnagopi487@

selftests/net: add tcp_port_share to .gitignore

Add the tcp_port_share test binary to .gitignore to avoid
accidentally staging the build artifact.

Signed-off-by: Gopi Krishna Menon <krishnagopi487@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250929163140.122383-1-krishnagopi487@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests: net: add test for ipv6 fragmentation

Add selftest for the IPv6 fragmentation regression which affected
several stable kernels.

Commit a18dfa9925b9 ("ipv6: save dontfrag in cork") was bac

selftests: net: add test for ipv6 fragmentation

Add selftest for the IPv6 fragmentation regression which affected
several stable kernels.

Commit a18dfa9925b9 ("ipv6: save dontfrag in cork") was backported to
stable without some prerequisite commits. This caused a regression when
sending IPv6 UDP packets by preventing fragmentation and instead
returning -1 (EMSGSIZE).

Add selftest to check for this issue by attempting to send a packet
larger than the interface MTU. The packet will be fragmented on a
working kernel, with sendmsg(2) correctly returning the expected number
of bytes sent. When the regression is present, sendmsg returns -1 and
sets errno to EMSGSIZE.

Link: https://lore.kernel.org/stable/aElivdUXqd1OqgMY@karahi.gladserv.com
Signed-off-by: Brett A C Sheffield <bacs@librecast.net>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250903154925.13481-1-bacs@librecast.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

show more ...

selftest: af_unix: Add test for SO_INQ.

Let's add a simple test to check the basic functionality of SO_INQ.

The test does the following:

1. Create socketpair in self->fd[]
2. Enable SO_INQ
3

selftest: af_unix: Add test for SO_INQ.

Let's add a simple test to check the basic functionality of SO_INQ.

The test does the following:

1. Create socketpair in self->fd[]
2. Enable SO_INQ
3. Send data via self->fd[0]
4. Receive data from self->fd[1]
5. Compare the SCM_INQ cmsg with ioctl(SIOCINQ)

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250702223606.1054680-8-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: net: add passive TFO test binary

Add a simple passive TFO server and client test binary. This will be
used to test the SO_INCOMING_NAPI_ID of passive TFO accepted sockets.

Signed-off-by:

selftests: net: add passive TFO test binary

Add a simple passive TFO server and client test binary. This will be
used to test the SO_INCOMING_NAPI_ID of passive TFO accepted sockets.

Signed-off-by: David Wei <dw@davidwei.uk>
Link: https://patch.msgid.link/20250617212102.175711-3-dw@davidwei.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests/net: test sk_filter support for SKF_NET_OFF on frags

Verify that a classic BPF linux socket filter correctly matches
packet contents. Including when accessing contents in an
skb_frag.

1.

selftests/net: test sk_filter support for SKF_NET_OFF on frags

Verify that a classic BPF linux socket filter correctly matches
packet contents. Including when accessing contents in an
skb_frag.

1. Open a SOCK_RAW socket with a classic BPF filter on UDP dport 8000.
2. Open a tap device with IFF_NAPI_FRAGS to inject skbs with frags.
3. Send a packet for which the UDP header is in frag[0].
4. Receive this packet to demonstrate that the socket accepted it.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20250408132833.195491-3-willemdebruijn.kernel@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

show more ...

selftests/net: add proc_net_pktgen to .gitignore

Ensure git doesn't pick up this new target.

Fixes: 03544faad761 ("selftest: net: add proc_net_pktgen")
Signed-off-by: Willem de Bruijn <willemb@goog

selftests/net: add proc_net_pktgen to .gitignore

Ensure git doesn't pick up this new target.

Fixes: 03544faad761 ("selftest: net: add proc_net_pktgen")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250307031356.368350-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: net: add support for testing SO_RCVMARK and SO_RCVPRIORITY

Introduce tests to verify the correct functionality of the SO_RCVMARK and
SO_RCVPRIORITY socket options.

Suggested-by: Jakub Ki

selftests: net: add support for testing SO_RCVMARK and SO_RCVPRIORITY

Introduce tests to verify the correct functionality of the SO_RCVMARK and
SO_RCVPRIORITY socket options.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Suggested-by: Ferenc Fejes <fejes@inf.elte.hu>
Signed-off-by: Anna Emese Nyiri <annaemesenyiri@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20250214205828.48503-1-annaemesenyiri@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

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

Cross-merge networking fixes after downstream PR (net-6.12-rc8).

Conflicts:

tools/testing/selftests/net/.gitignore
252e01e68241 ("s

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

Cross-merge networking fixes after downstream PR (net-6.12-rc8).

Conflicts:

tools/testing/selftests/net/.gitignore
252e01e68241 ("selftests: net: add netlink-dumps to .gitignore")
be43a6b23829 ("selftests: ncdevmem: Move ncdevmem under drivers/net/hw")
https://lore.kernel.org/all/20241113122359.1b95180a@canb.auug.org.au/

drivers/net/phy/phylink.c
671154f174e0 ("net: phylink: ensure PHY momentary link-fails are handled")
7530ea26c810 ("net: phylink: remove "using_mac_select_pcs"")

Adjacent changes:

drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
5b366eae7193 ("stmmac: dwmac-intel-plat: fix call balance of tx_clk handling routines")
e96321fad3ad ("net: ethernet: Switch back to struct platform_driver::remove()")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: net: Add busy_poll_test

Add an epoll busy poll test using netdevsim.

This test is comprised of:
- busy_poller (via busy_poller.c)
- busy_poll_test.sh which loads netdevsim, sets up n

selftests: net: Add busy_poll_test

Add an epoll busy poll test using netdevsim.

This test is comprised of:
- busy_poller (via busy_poller.c)
- busy_poll_test.sh which loads netdevsim, sets up network namespaces,
and runs busy_poller to receive data and socat to send data.

The selftest tests two different scenarios:
- busy poll (the pre-existing version in the kernel)
- busy poll with suspend enabled (what this series adds)

The data transmit is a 1MiB temporary file generated from /dev/urandom
and the test is considered passing if the md5sum of the input file to
socat matches the md5sum of the output file from busy_poller.

netdevsim was chosen instead of veth due to netdevsim's support for
netdev-genl.

For now, this test uses the functionality that netdevsim provides. In the
future, perhaps netdevsim can be extended to emulate device IRQs to more
thoroughly test all pre-existing kernel options (like defer_hard_irqs)
and suspend.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Co-developed-by: Martin Karsten <mkarsten@uwaterloo.ca>
Signed-off-by: Martin Karsten <mkarsten@uwaterloo.ca>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20241109050245.191288-6-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: ncdevmem: Move ncdevmem under drivers/net/hw

This is where all the tests that depend on the HW functionality live in
and this is where the automated test is gonna be added in the next
pat

selftests: ncdevmem: Move ncdevmem under drivers/net/hw

This is where all the tests that depend on the HW functionality live in
and this is where the automated test is gonna be added in the next
patch.

Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20241107181211.3934153-12-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: net: add netlink-dumps to .gitignore

Commit 55d42a0c3f9c ("selftests: net: add a test for closing
a netlink socket ith dump in progress") added a new test
but did not add it to gitignore.

selftests: net: add netlink-dumps to .gitignore

Commit 55d42a0c3f9c ("selftests: net: add a test for closing
a netlink socket ith dump in progress") added a new test
but did not add it to gitignore.

Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20241108004731.2979878-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: net: add msg_oob to gitignore

This executable is missing from the corresponding gitignore file.
Add msg_oob to the net gitignore list.

Signed-off-by: Javier Carrasco <javier.carrasco.cru

selftests: net: add msg_oob to gitignore

This executable is missing from the corresponding gitignore file.
Add msg_oob to the net gitignore list.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241005-net-selftests-gitignore-v2-1-3a0b2876394a@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests: add ncdevmem, netcat for devmem TCP

ncdevmem is a devmem TCP netcat. It works similarly to netcat, but it
sends and receives data using the devmem TCP APIs. It uses udmabuf as
the dmabuf

selftests: add ncdevmem, netcat for devmem TCP

ncdevmem is a devmem TCP netcat. It works similarly to netcat, but it
sends and receives data using the devmem TCP APIs. It uses udmabuf as
the dmabuf provider. It is compatible with a regular netcat running on
a peer, or a ncdevmem running on a peer.

In addition to normal netcat support, ncdevmem has a validation mode,
where it sends a specific pattern and validates this pattern on the
receiver side to ensure data integrity.

Suggested-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20240910171458.219195-13-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests: add selftest for UDP SO_PEEK_OFF support

Add the SO_PEEK_OFF selftest for UDP. In this patch, I mainly do
three things:
1. rename tcp_so_peek_off.c
2. adjust for UDP protocol
3. add selft

selftests: add selftest for UDP SO_PEEK_OFF support

Add the SO_PEEK_OFF selftest for UDP. In this patch, I mainly do
three things:
1. rename tcp_so_peek_off.c
2. adjust for UDP protocol
3. add selftests into it

Suggested-by: Jon Maloy <jmaloy@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

selftest: af_unix: Remove test_unix_oob.c.

test_unix_oob.c does not fully cover AF_UNIX's MSG_OOB functionality,
thus there are discrepancies between TCP behaviour.

Also, the test uses fork() to cr

selftest: af_unix: Remove test_unix_oob.c.

test_unix_oob.c does not fully cover AF_UNIX's MSG_OOB functionality,
thus there are discrepancies between TCP behaviour.

Also, the test uses fork() to create message producer, and it's not
easy to understand and add more test cases.

Let's remove test_unix_oob.c and rewrite a new test.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

show more ...

selftest: epoll_busy_poll: epoll busy poll tests

Add a simple test for the epoll busy poll ioctls, using the kernel
selftest harness.

This test ensures that the ioctls have the expected return code

selftest: epoll_busy_poll: epoll busy poll tests

Add a simple test for the epoll busy poll ioctls, using the kernel
selftest harness.

This test ensures that the ioctls have the expected return codes and
that the kernel properly gets and sets epoll busy poll parameters.

The test can be expanded in the future to do real busy polling (provided
another machine to act as the client is available).

Signed-off-by: Joe Damato <jdamato@fastly.com>
Link: https://lore.kernel.org/r/20240508184008.48264-1-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests: drv-net: add checksum tests

Run tools/testing/selftest/net/csum.c as part of drv-net.
This binary covers multiple scenarios, based on arguments given,
for both IPv4 and IPv6:

- Accept UD

selftests: drv-net: add checksum tests

Run tools/testing/selftest/net/csum.c as part of drv-net.
This binary covers multiple scenarios, based on arguments given,
for both IPv4 and IPv6:

- Accept UDP correct checksum
- Detect UDP invalid checksum
- Accept TCP correct checksum
- Detect TCP invalid checksum

- Transmit UDP: basic checksum offload
- Transmit UDP: zero checksum conversion

The test direction is reversed between receive and transmit tests, so
that the NIC under test is always the local machine.

In total this adds up to 12 testcases, with more to follow. For
conciseness, I replaced individual functions with a function factory.

Also detect hardware offload feature availability using Ethtool
netlink and skip tests when either feature is off. This need may be
common for offload feature tests and eventually deserving of a thin
wrapper in lib.py.

Missing are the PF_PACKET based send tests ('-P'). These use
virtio_net_hdr to program hardware checksum offload. Which requires
looking up the local MAC address and (harder) the MAC of the next hop.
I'll have to give it some though how to do that robustly and where
that code would belong.

Tested:

make -C tools/testing/selftests/ \
TARGETS="drivers/net drivers/net/hw" \
install INSTALL_PATH=/tmp/ksft
cd /tmp/ksft

sudo NETIF=ens4 REMOTE_TYPE=ssh \
REMOTE_ARGS="root@10.40.0.2" \
LOCAL_V4="10.40.0.1" \
REMOTE_V4="10.40.0.2" \
./run_kselftest.sh -t drivers/net/hw:csum.py

Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20240507154216.501111-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftest: af_unix: Test GC for SCM_RIGHTS.

This patch adds test cases to verify the new GC.

We run each test for the following cases:

* SOCK_DGRAM
* SOCK_STREAM without embryo socket
* SOCK_

selftest: af_unix: Test GC for SCM_RIGHTS.

This patch adds test cases to verify the new GC.

We run each test for the following cases:

* SOCK_DGRAM
* SOCK_STREAM without embryo socket
* SOCK_STREAM without embryo socket + MSG_OOB
* SOCK_STREAM with embryo sockets
* SOCK_STREAM with embryo sockets + MSG_OOB

Before and after running each test case, we ensure that there is
no AF_UNIX socket left in the netns by reading /proc/net/protocols.

We cannot use /proc/net/unix and UNIX_DIAG because the embryo socket
does not show up there.

Each test creates multiple sockets in an array. We pass sockets in
the even index using the peer sockets in the odd index.

So, send_fd(0, 1) actually sends fd[0] to fd[2] via fd[0 + 1].

Test 1 : A <-> A
Test 2 : A <-> B
Test 3 : A -> B -> C <- D
^.___|___.' ^
`---------'

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/20240325202425.60930-16-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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selftests/net: Add log.txt and tools to .gitignore

Update .gitignore to untrack tools directory and log.txt. "tools" is
generated in "selftests/net/Makefile" and log.txt is generated in
"selftests/n

selftests/net: Add log.txt and tools to .gitignore

Update .gitignore to untrack tools directory and log.txt. "tools" is
generated in "selftests/net/Makefile" and log.txt is generated in
"selftests/net/gro.sh" when executing run_all_tests.

Signed-off-by: Anh Tuan Phan <tuananhlfc@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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