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Compiling lwt_reroute.c with GCC 12.3 for mips64el/musl-libc yields errors:
In file included from .../include/arpa/inet.h:9,
from ./test_progs.h:18,
from tools/testing/selftests/bpf/prog_tests/lwt_helpers.h:11,
from tools/testing/selftests/bpf/prog_tests/lwt_reroute.c:52:
.../include/netinet/in.h:23:8: error: redefinition of 'struct in6_addr'
23 | struct in6_addr {
| ^~~~~~~~
In file included from .../include/linux/icmp.h:24,
from tools/testing/selftests/bpf/prog_tests/lwt_helpers.h:9:
.../include/linux/in6.h:33:8: note: originally defined here
33 | struct in6_addr {
| ^~~~~~~~
.../include/netinet/in.h:34:8: error: redefinition of 'struct sockaddr_in6'
34 | struct sockaddr_in6 {
| ^~~~~~~~~~~~
.../include/linux/in6.h:50:8: note: originally defined here
50 | struct sockaddr_in6 {
| ^~~~~~~~~~~~
.../include/netinet/in.h:42:8: error: redefinition of 'struct ipv6_mreq'
42 | struct ipv6_mreq {
| ^~~~~~~~~
.../include/linux/in6.h:60:8: note: originally defined here
60 | struct ipv6_mreq {
| ^~~~~~~~~
These errors occur because <linux/in6.h> is included before <netinet/in.h>,
bypassing the Linux uapi/libc compat mechanism's partial musl support. As
described in [1] and [2], fix these errors by including <netinet/in.h> in
lwt_reroute.c before any uapi headers.
[1]: commit c0bace798436 ("uapi libc compat: add fallback for unsupported libcs")
[2]: https://git.musl-libc.org/cgit/musl/commit/?id=04983f227238
Fixes: 6c77997bc639 ("selftests/bpf: Add lwt_xmit tests for BPF_REROUTE")
Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/bd2908aec0755ba8b75f5dc41848b00585f5c73e.1722244708.git.tony.ambardar@gmail.com
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Recently, when running './test_progs -j', I occasionally hit the
following errors:
test_lwt_redirect:PASS:pthread_create 0 nsec
test_lwt_redirect_run:FAIL:netns_create unexpected error: 256 (errno 0)
#142/2 lwt_redirect/lwt_redirect_normal_nomac:FAIL
#142 lwt_redirect:FAIL
test_lwt_reroute:PASS:pthread_create 0 nsec
test_lwt_reroute_run:FAIL:netns_create unexpected error: 256 (errno 0)
test_lwt_reroute:PASS:pthread_join 0 nsec
#143/2 lwt_reroute/lwt_reroute_qdisc_dropped:FAIL
#143 lwt_reroute:FAIL
The netns_create() definition looks like below:
#define NETNS "ns_lwt"
static inline int netns_create(void)
{
return system("ip netns add " NETNS);
}
One possibility is that both lwt_redirect and lwt_reroute create
netns with the same name "ns_lwt" which may cause conflict. I tried
the following example:
$ sudo ip netns add abc
$ echo $?
0
$ sudo ip netns add abc
Cannot create namespace file "/var/run/netns/abc": File exists
$ echo $?
1
$
The return code for above netns_create() is 256. The internet search
suggests that the return value for 'ip netns add ns_lwt' is 1, which
matches the above 'sudo ip netns add abc' example.
This patch tried to use different netns names for two tests to avoid
'ip netns add <name>' failure.
I ran './test_progs -j' 10 times and all succeeded with
lwt_redirect/lwt_reroute tests.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20240205052914.1742687-1-yonghong.song@linux.dev
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In s390, CI reported that the sock_iter_batch selftest
hits this error very often:
2024-01-26T16:56:49.3091804Z Bind /proc/self/ns/net -> /run/netns/sock_iter_batch_netns failed: No such file or directory
2024-01-26T16:56:49.3149524Z Cannot remove namespace file "/run/netns/sock_iter_batch_netns": No such file or directory
2024-01-26T16:56:49.3772213Z test_sock_iter_batch:FAIL:ip netns add sock_iter_batch_netns unexpected error: 256 (errno 0)
It happens very often in s390 but Manu also noticed it happens very
sparsely in other arch also.
It turns out the default dash shell does not recognize "&>"
as a redirection operator, so the command went to the background.
In the sock_iter_batch selftest, the "ip netns delete" went
into background and then race with the following "ip netns add"
command.
This patch replaces the "&> /dev/null" usage with ">/dev/null 2>&1"
and does this redirection in the SYS_NOFAIL macro instead of doing
it individually by its caller. The SYS_NOFAIL callers do not care
about failure, so it is no harm to do this redirection even if
some of the existing callers do not redirect to /dev/null now.
It touches different test files, so I skipped the Fixes tags
in this patch. Some of the changed tests do not use "&>"
but they use the SYS_NOFAIL, so these tests are also
changed to avoid doing its own redirection because
SYS_NOFAIL does it internally now.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240127025017.950825-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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There is no lwt test case for BPF_REROUTE yet. Add test cases for both
normal and abnormal situations. The abnormal situation is set up with an
fq qdisc on the reroute target device. Without proper fixes, overflow
this qdisc queue limit (to trigger a drop) would panic the kernel.
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/62c8ddc1e924269dcf80d2e8af1a1e632cee0b3a.1692326837.git.yan@cloudflare.com
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