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passt/Makefile
David Gibson 08007d0b25 Makefile: Avoid using wildcard sources 
The passt/pasta Makefile makes fairly heavy use of GNU make's $(wildcard)
function to locate the sources and headers to build.  Using wildcards for
the things to compile is usually a bad idea though: if somehow you end up
with a .c or .h file in your tree you didn't expect it can misbuild in an
exceedingly confusing way.  In particular this can sometimes happen if
switching between releases / branches where files have been added or
removed without 100% cleaning the tree.

It also makes life a bit complicated if building multiple different
binaries in the same tree: we already have some rather awkward
$(filter-out) constructions to avoid including qrap.c in the passt build.

Replace use of $(wildcard) with the more idiomatic approach of defining
variables listing all the relevant source files then using that throughout.
In the rule for seccomp.h there was also a bare "*.c" which caused make to
always rebuild that target.  Fix that as well.

Similarly, seccomp.sh uses a wildcard to locate the sources, which is
unwise for the same reasons.  Make it take the sources to examine on the
command line instead, and have the Makefile pass them in from the same
variables.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2022-06-18 09:06:00 +02:00

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Makefile
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# SPDX-License-Identifier: AGPL-3.0-or-later
#
# PASST - Plug A Simple Socket Transport
# for qemu/UNIX domain socket mode
#
# PASTA - Pack A Subtle Tap Abstraction
# for network namespace/tap device mode
#
# Copyright (c) 2021 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>
RLIMIT_STACK_VAL := $(shell /bin/sh -c 'ulimit -s')
ifeq ($(RLIMIT_STACK_VAL),unlimited)
RLIMIT_STACK_VAL := 1024
endif
# Get 'uname -m'-like architecture description for target
TARGET_ARCH := $(shell $(CC) -dumpmachine | cut -f1 -d- | tr [a-z] [A-Z])
TARGET_ARCH := $(shell echo $(TARGET_ARCH) | sed 's/POWERPC/PPC/')
AUDIT_ARCH := $(shell echo $(TARGET_ARCH) | sed 's/^ARM.*/ARM/')
AUDIT_ARCH := $(shell echo $(AUDIT_ARCH) | sed 's/I[456]86/I386/')
AUDIT_ARCH := $(shell echo $(AUDIT_ARCH) | sed 's/PPC64/PPC/')
AUDIT_ARCH := $(shell echo $(AUDIT_ARCH) | sed 's/PPCLE/PPC64LE/')
CFLAGS += -Wall -Wextra -pedantic -std=c99 -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
CFLAGS += -D_FORTIFY_SOURCE=2 -O2 -pie -fPIE
CFLAGS += -DPAGE_SIZE=$(shell getconf PAGE_SIZE)
CFLAGS += -DNETNS_RUN_DIR=\"/run/netns\"
CFLAGS += -DPASST_AUDIT_ARCH=AUDIT_ARCH_$(AUDIT_ARCH)
CFLAGS += -DRLIMIT_STACK_VAL=$(RLIMIT_STACK_VAL)
CFLAGS += -DARCH=\"$(TARGET_ARCH)\"
PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c icmp.c igmp.c \
mld.c ndp.c netlink.c packet.c passt.c pasta.c pcap.c siphash.c \
tap.c tcp.c tcp_splice.c udp.c util.c
QRAP_SRCS = qrap.c
SRCS = $(PASST_SRCS) $(QRAP_SRCS)
PASST_HEADERS = arch.h arp.h checksum.h conf.h dhcp.h dhcpv6.h icmp.h \
ndp.h netlink.h packet.h passt.h pasta.h pcap.h siphash.h \
tap.h tcp.h tcp_splice.h udp.h util.h
HEADERS = $(PASST_HEADERS)
# On gcc 11.2, with -O2 and -flto, tcp_hash() and siphash_20b(), if inlined,
# seem to be hitting something similar to:
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78993
# from the pointer arithmetic used from the tcp_tap_handler() path to get the
# remote connection address.
ifeq ($(shell $(CC) -dumpversion),11)
ifneq (,$(filter -flto%,$(CFLAGS)))
ifneq (,$(filter -O2,$(CFLAGS)))
CFLAGS += -DTCP_HASH_NOINLINE
CFLAGS += -DSIPHASH_20B_NOINLINE
endif
endif
endif
C := \#include <linux/tcp.h>\nstruct tcp_info x = { .tcpi_snd_wnd = 0 };
ifeq ($(shell printf "$(C)" | $(CC) -S -xc - -o - >/dev/null 2>&1; echo $$?),0)
CFLAGS += -DHAS_SND_WND
endif
C := \#include <linux/tcp.h>\nstruct tcp_info x = { .tcpi_bytes_acked = 0 };
ifeq ($(shell printf "$(C)" | $(CC) -S -xc - -o - >/dev/null 2>&1; echo $$?),0)
CFLAGS += -DHAS_BYTES_ACKED
endif
C := \#include <linux/tcp.h>\nstruct tcp_info x = { .tcpi_min_rtt = 0 };
ifeq ($(shell printf "$(C)" | $(CC) -S -xc - -o - >/dev/null 2>&1; echo $$?),0)
CFLAGS += -DHAS_MIN_RTT
endif
C := \#include <sys/random.h>\nint main(){int a=getrandom(0, 0, 0);}
ifeq ($(shell printf "$(C)" | $(CC) -S -xc - -o - >/dev/null 2>&1; echo $$?),0)
CFLAGS += -DHAS_GETRANDOM
endif
ifeq ($(shell :|$(CC) -fstack-protector-strong -S -xc - >/dev/null 2>&1; echo $$?),0)
CFLAGS += -fstack-protector-strong
endif
prefix ?= /usr/local
ifeq ($(TARGET_ARCH),X86_64)
all: passt passt.avx2 pasta pasta.avx2 qrap
BIN := passt passt.avx2 pasta pasta.avx2 qrap
else
all: passt pasta qrap
BIN := passt pasta qrap
endif
static: CFLAGS += -static -DGLIBC_NO_STATIC_NSS
static: clean all
seccomp.h: $(PASST_SRCS) $(PASST_HEADERS)
@ EXTRA_SYSCALLS=$(EXTRA_SYSCALLS) ./seccomp.sh $^
passt: $(PASST_SRCS) $(PASST_HEADERS) seccomp.h
$(CC) $(CFLAGS) $(PASST_SRCS) -o passt
passt.avx2: CFLAGS += -Ofast -mavx2 -ftree-vectorize -funroll-loops
passt.avx2: $(PASST_SRCS) $(PASST_HEADERS) seccomp.h
$(CC) $(filter-out -O2,$(CFLAGS)) $(PASST_SRCS) -o passt.avx2
passt.avx2: passt
pasta.avx2: passt.avx2
ln -s passt.avx2 pasta.avx2
pasta: passt
ln -s passt pasta
ln -s passt.1 pasta.1
qrap: $(QRAP_SRCS) passt.h
$(CC) $(CFLAGS) $(QRAP_SRCS) -o qrap
valgrind: EXTRA_SYSCALLS="rt_sigprocmask rt_sigtimedwait rt_sigaction \
getpid gettid kill clock_gettime mmap munmap open \
unlink exit_group gettimeofday"
valgrind: CFLAGS:=-g -O0 $(filter-out -O%,$(CFLAGS))
valgrind: all
.PHONY: clean
clean:
-${RM} passt passt.avx2 *.o seccomp.h qrap pasta pasta.avx2 pasta.1 \
passt.tar passt.tar.gz *.deb *.rpm
install: $(BIN)
mkdir -p $(DESTDIR)$(prefix)/bin $(DESTDIR)$(prefix)/share/man/man1
cp -d $(BIN) $(DESTDIR)$(prefix)/bin
cp -d passt.1 pasta.1 qrap.1 $(DESTDIR)$(prefix)/share/man/man1
uninstall:
-${RM} $(DESTDIR)$(prefix)/bin/passt
-${RM} $(DESTDIR)$(prefix)/bin/passt.avx2
-${RM} $(DESTDIR)$(prefix)/bin/pasta
-${RM} $(DESTDIR)$(prefix)/bin/pasta.avx2
-${RM} $(DESTDIR)$(prefix)/bin/qrap
-${RM} $(DESTDIR)$(prefix)/share/man/man1/passt.1
-${RM} $(DESTDIR)$(prefix)/share/man/man1/pasta.1
-${RM} $(DESTDIR)$(prefix)/share/man/man1/qrap.1
pkgs: static
tar cf passt.tar -P --xform 's//\/usr\/bin\//' $(BIN)
tar rf passt.tar -P --xform 's//\/usr\/share\/man\/man1\//' \
passt.1 pasta.1 qrap.1
gzip passt.tar
EMAIL="sbrivio@redhat.com" fakeroot alien --to-deb \
--description="User-mode networking for VMs and namespaces" \
-k --version=$(shell git rev-parse --short HEAD) \
passt.tar.gz
fakeroot alien --to-rpm --target=$(shell uname -m) \
--description="User-mode networking for VMs and namespaces" \
-k --version=g$(shell git rev-parse --short HEAD) passt.tar.gz
# Checkers currently disabled for clang-tidy:
# - llvmlibc-restrict-system-libc-headers
# TODO: this is Linux-only for the moment, nice to fix eventually
#
# - bugprone-macro-parentheses
# - google-readability-braces-around-statements
# - hicpp-braces-around-statements
# - readability-braces-around-statements
# Debatable whether that improves readability, right now it would look
# like a mess
#
# - readability-magic-numbers
# - cppcoreguidelines-avoid-magic-numbers
# TODO: in most cases they are justified, but probably not everywhere
#
# - clang-analyzer-valist.Uninitialized
# TODO: enable once https://bugs.llvm.org/show_bug.cgi?id=41311 is fixed
#
# - clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling
# Probably not doable to impement this without plain memcpy(), memset()
#
# - cppcoreguidelines-init-variables
# Dubious value, would kill readability
#
# - hicpp-signed-bitwise
# Those are needed for syscalls, epoll_wait flags, etc.
#
# - llvm-include-order
# TODO: not really important, but nice to fix eventually
#
# - readability-isolate-declaration
# Dubious value, would kill readability
#
# - bugprone-narrowing-conversions
# - cppcoreguidelines-narrowing-conversions
# TODO: nice to fix eventually
#
# - cppcoreguidelines-avoid-non-const-global-variables
# TODO: check, fix, and more in general constify wherever possible
#
# - altera-unroll-loops
# - altera-id-dependent-backward-branch
# TODO: check paths where it might make sense to improve performance
#
# - bugprone-easily-swappable-parameters
# Not much can be done about them other than being careful
#
# - readability-function-cognitive-complexity
# TODO: split reported functions
#
# - altera-struct-pack-align
# "Poor" alignment needed for structs reflecting message formats/headers
#
# - concurrency-mt-unsafe
# TODO: check again if multithreading is implemented
clang-tidy: $(SRCS) $(HEADERS)
clang-tidy -checks=*,-modernize-*,\
-clang-analyzer-valist.Uninitialized,\
-cppcoreguidelines-init-variables,\
-bugprone-macro-parentheses,\
-google-readability-braces-around-statements,\
-hicpp-braces-around-statements,\
-readability-braces-around-statements,\
-readability-magic-numbers,\
-llvmlibc-restrict-system-libc-headers,\
-hicpp-signed-bitwise,\
-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling,\
-llvm-include-order,\
-cppcoreguidelines-avoid-magic-numbers,\
-readability-isolate-declaration,\
-bugprone-narrowing-conversions,\
-cppcoreguidelines-narrowing-conversions,\
-cppcoreguidelines-avoid-non-const-global-variables,\
-altera-unroll-loops,-altera-id-dependent-backward-branch,\
-bugprone-easily-swappable-parameters,\
-readability-function-cognitive-complexity,\
-altera-struct-pack-align,\
-concurrency-mt-unsafe \
-config='{CheckOptions: [{key: bugprone-suspicious-string-compare.WarnOnImplicitComparison, value: "false"}]}' \
--warnings-as-errors=* $(SRCS) -- $(filter-out -pie,$(CFLAGS))
ifeq ($(shell $(CC) -v 2>&1 | grep -c "gcc version"),1)
TARGET := $(shell ${CC} -v 2>&1 | sed -n 's/Target: \(.*\)/\1/p')
VER := $(shell $(CC) -dumpversion)
EXTRA_INCLUDES := /usr/lib/gcc/$(TARGET)/$(VER)/include
EXTRA_INCLUDES_OPT := -I$(EXTRA_INCLUDES)
else
EXTRA_INCLUDES_OPT :=
endif
cppcheck: $(SRCS) $(HEADERS)
cppcheck --std=c99 --error-exitcode=1 --enable=all --force \
--inconclusive --library=posix \
-I/usr/include $(EXTRA_INCLUDES_OPT) \
\
--suppress=syntaxError:/usr/include/stdlib.h \
--suppress=missingIncludeSystem \
--suppress="*:$(EXTRA_INCLUDES)/avx512fintrin.h" \
--suppress="*:$(EXTRA_INCLUDES)/xmmintrin.h" \
--suppress="*:$(EXTRA_INCLUDES)/emmintrin.h" \
--suppress="*:$(EXTRA_INCLUDES)/avxintrin.h" \
--suppress="*:$(EXTRA_INCLUDES)/bmiintrin.h" \
\
--suppress=objectIndex:tcp.c --suppress=objectIndex:udp.c \
--suppress=va_list_usedBeforeStarted:util.c \
--suppress=unusedFunction \
--suppress=knownConditionTrueFalse:conf.c \
--suppress=strtokCalled:conf.c --suppress=strtokCalled:qrap.c \
--suppress=getpwnamCalled:passt.c \
--suppress=localtimeCalled:pcap.c \
--suppress=unusedStructMember:pcap.c \
--suppress=funcArgNamesDifferent:util.h \
--suppress=unusedStructMember:dhcp.c \
\
--suppress=unmatchedSuppression:conf.c \
--suppress=unmatchedSuppression:dhcp.c \
--suppress=unmatchedSuppression:passt.c \
--suppress=unmatchedSuppression:pcap.c \
--suppress=unmatchedSuppression:qrap.c \
--suppress=unmatchedSuppression:tcp.c \
--suppress=unmatchedSuppression:udp.c \
--suppress=unmatchedSuppression:util.c \
--suppress=unmatchedSuppression:util.h \
$(filter -D%,$(CFLAGS)) \
.
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