Depending on the C library, but not necessarily in all the
functions we use, statx() might be used instead of stat(),
getdents() instead of getdents64(), readlinkat() instead of
readlink(), openat() instead of open().
On aarch64, it's clone() and not fork(), and dup3() instead of
dup2() -- just allow the existing alternative instead of dealing
with per-arch selections.
Since glibc commit 9a7565403758 ("posix: Consolidate fork
implementation"), we need to allow set_robust_list() for
fork()/clone(), even in a single-threaded context.
On some architectures, epoll_pwait() is provided instead of
epoll_wait(), but never both. Same with newfstat() and
fstat(), sigreturn() and rt_sigreturn(), getdents64() and
getdents(), readlink() and readlinkat(), unlink() and
unlinkat(), whereas pipe() might not be available, but
pipe2() always is, exclusively or not.
Seen on Fedora 34: newfstatat() is used on top of fstat().
syslog() is an actual system call on some glibc/arch combinations,
instead of a connect()/send() implementation.
On ppc64 and ppc64le, _llseek(), recv(), send() and getuid()
are used. For ppc64 only: ugetrlimit() for the getrlimit()
implementation, plus sigreturn() and fcntl64().
On s390x, additionally, we need to allow socketcall() (on top
of socket()), and sigreturn() also for passt (not just for
pasta).
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Seen on PPC with some older kernel versions: we seemingly have bytes
left to read from the returned array of dirent structs, but d_reclen
is zero: this, and all the subsequent entries, are not valid.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
The effect of this typo became visible in an IPv6-only environment,
where passt wouldn't work at all.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Bitmap manipulating functions would otherwise refer to inconsistent
sets of bits on big-endian architectures. While at it, fix up a
couple of casts.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
tcpi_bytes_acked and tcpi_min_rtt are only available on recent
kernel versions: provide fall-back paths (incurring some grade of
performance penalty).
Support for getrandom() was introduced in Linux 3.17 and glibc 2.25:
provide an alternate mechanism for that as well, reading from
/dev/random.
Also check if NETLINK_GET_STRICT_CHK is defined before using it:
it's not strictly needed, we'll filter out irrelevant results from
netlink anyway.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Some C library functions are commonly implemented by different syscalls
on different architectures. Add a mechanism to allow selected syscalls
for a single architecture, syntax in #syscalls comment is:
#syscalls <arch>:<name>
e.g. s390x:socketcall, given that socketcall() is commonly used there
instead of socket().
This is now implemented by a compiler probe for syscall numbers,
auditd tools (ausyscall) are not required anymore as a result.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
On some distributions, on ppc64, ulimit -s returns 'unlimited': add a
reasonable default, and also make sure ulimit is invoked using the
default shell, which should ensure ulimit is actually implemented.
Also note that AUDIT_ARCH doesn't follow closely the naming reported
by 'uname -m': convert for i386 and ppc as needed.
While at it, move inclusion of seccomp.h after util.h, the former is
less generic (cosmetic/clang-tidy only).
Older kernel headers might lack a definition for AUDIT_ARCH_PPC64LE:
define that explicitly if it's not available.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This is the only remaining Linux-specific include -- drop it to avoid
clang-tidy warnings and to make code more portable.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Based on an original patch by Giuseppe Scrivano: there's no need
to pass $0 to usage, drop that everywhere, and make it consistent.
Don't exit with error on -h, --help.
Suggested-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
...it looks like, on a recent Fedora installation, daemon() uses it.
Reported-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
...I broke this while playing with clang-tidy, and didn't add
tests for pasta's --config-net yet.
Reported-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This is actually annoying: there's no way to make it fork into
background when running from a script. However, it's always
possible to keep it in foreground with -f. Make it simpler, and
always fork into background if -f is not given.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
An inline comment prefixed by a space doesn't mean the space
is dropped, and sleep(1) will get a blank in its argument.
Move the comment on its own line.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
They'll start DAD as we bring up the interface, and the DHCPv6
client might be unreasonably delayed if we start it too early.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This was actually fine "on the wire", but it's inconsistent with the
way we hash other addresses/protocols and also ends up with a wrong
endianness in captures in case we replace the address with our
default gateway.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This is not explicitly forbidden, but it confuses the ISC's DHCP client,
and doesn't make sense anyway.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
If the solicitation comes from ::, it's the guest performing
duplicate address detection -- don't answer that.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Found while re-reading this part, zero works as well, but a
host might legitimately refuse a value that's below a given
threshold.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Some of those warnings don't trigger even on systems with very
similar toolchains, suppress unmatchedSuppression warnings, they're
basically useless.
While at it, pass CFLAGS to cppcheck.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
...mostly false positives, but a number of very relevant ones too,
in tcp_get_sndbuf(), tcp_conn_from_tap(), and siphash PREAMBLE().
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
With recent improvements, we're not CPU-bound at all while testing
UDP performance. Give the VM more memory and CPUs, forward two
additional ports, start up to four threads in parallel, and give
single iperf3 threads higher bandwidth targets.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
The issue with a higher UDP_TAP_FRAMES was actually coming from a
payload size the guest couldn't digest. Fix that, and bump
UDP_TAP_FRAMES back to 128.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Unions and structs, you all have names now.
Take the chance to enable bugprone-reserved-identifier,
cert-dcl37-c, and cert-dcl51-cpp checkers in clang-tidy.
Provide a ffsl() weak declaration using gcc built-in.
Start reordering includes, but that's not enough for the
llvm-include-order checker yet.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
On most recent CPUs, that's a better indication of all-core turbo
frequency, or non-turbo frequency, than /proc/cpuinfo.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Detect missing tcpi_snd_wnd in struct tcp_info at build time,
otherwise build fails with a pre-5.3 linux/tcp.h header.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Otherwise, we'll stop returning lines at the first empty line
in a file -- this is not expected in case of e.g. /etc/resolv.conf.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This shouldn't happen on any sane configuration, but I just met an
example of that: the default IPv6 gateway on the host is configured
with a global unicast address, we use that as source for RA, DHCPv6
replies, and the guest ignores it. Same later on if we talk TCP or
UDP and the guest has no idea where that address comes from.
Use our link-local address in case the gateway address is global.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Given that get_dns() touches the buffer read by line_read(), we
can't optimise that by passing the existing buffer.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
A mix of unchecked return values, a missing permission mask for
open(2) with O_CREAT, and some false positives from
-Wstringop-overflow and -Wmaybe-uninitialized.
Reported-by: Martin Hauke <mardnh@gmx.de>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
SPDX tags don't replace license files. Some notices were missing and
some tags were not according to the SPDX specification, too.
Now reuse --lint from the REUSE tool (https://reuse.software/) passes.
Reported-by: Martin Hauke <mardnh@gmx.de>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Martin reports that DESTDIR is ignored in install/uninstall targets,
see also:
https://www.gnu.org/prep/standards/html_node/DESTDIR.html
Reported-by: Martin Hauke <mardnh@gmx.de>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
