build: add minimum vmlinux.h and uapi headers

- Add caped vmlinux.h and uapi headers that are needed to compile bpf selftests. - uapi headers also provide exclusive definitions that are not available in the libbpf internal headers. - Add a new makefile target to generate uapi headers. - Remove bpftool dependency from Makefile.
aquasecurity · Feb 9, 2023 · 84a6686 · 84a6686
1 parent 15ae9ff
commit 84a6686
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diff --git a/Makefile b/Makefile
@@ -13,14 +13,11 @@ CLANG = clang
 GO = go
 VAGRANT = vagrant
 CLANG_FMT = clang-format
+GIT = $(shell which git || /bin/false)
 
 HOSTOS = $(shell uname)
 ARCH ?= $(shell uname -m | sed 's/x86_64/amd64/g; s/aarch64/arm64/g')
 
-BTFFILE = /sys/kernel/btf/vmlinux
-BPFTOOL = $(shell which bpftool || /bin/false)
-GIT = $(shell which git || /bin/false)
-VMLINUXH = $(OUTPUT)/vmlinux.h
 
 # libbpf
 
@@ -46,6 +43,16 @@ CGO_LDFLAGS_DYN = "-lelf -lz -lbpf"
 all: libbpfgo-static
 test: libbpfgo-static-test
 
+# libbpf uapi
+
+.PHONY: libbpf-uapi
+
+libbpf-uapi: $(LIBBPF_SRC)
+# UAPI headers can be installed by a different package so they're not installed
+# in by (libbpf) install rule.
+	UAPIDIR=$(LIBBPF_DESTDIR) \
+		$(MAKE) -C $(LIBBPF_SRC) install_uapi_headers
+
 # libbpfgo test object
 
 libbpfgo-test-bpf-static: libbpfgo-static	# needed for serialization
@@ -73,7 +80,7 @@ libbpfgo-dynamic-test: libbpfgo-test-bpf-dynamic
 
 # libbpf: static
 
-libbpfgo-static: $(VMLINUXH) | $(LIBBPF_OBJ)
+libbpfgo-static: libbpf-uapi $(LIBBPF_OBJ) 
 	CC=$(CLANG) \
 		CGO_CFLAGS=$(CGO_CFLAGS_STATIC) \
 		CGO_LDFLAGS=$(CGO_LDFLAGS_STATIC) \
@@ -92,28 +99,6 @@ libbpfgo-static-test: libbpfgo-test-bpf-static
 		-v -tags netgo -ldflags $(CGO_EXTLDFLAGS_STATIC) \
 		.
 
-# vmlinux header file
-
-.PHONY: vmlinuxh
-vmlinuxh: $(VMLINUXH)
-
-$(VMLINUXH): $(OUTPUT)
-	@if [ ! -f $(BTFFILE) ]; then \
-		echo "ERROR: kernel does not seem to support BTF"; \
-		exit 1; \
-	fi
-	@if [ ! $(BPFTOOL) ]; then \
-		echo "ERROR: could not find bpftool"; \
-		exit 1; \
-	fi;
-
-	@echo "INFO: generating $(VMLINUXH) from $(BTFFILE)"; \
-	if ! $(BPFTOOL) btf dump file $(BTFFILE) format c > $(VMLINUXH); then \
-		echo "ERROR: could not create $(VMLINUXH)"; \
-		rm -f "$(VMLINUXH)"; \
-		exit 1; \
-	fi;
-
 # static libbpf generation for the git submodule
 
 .PHONY: libbpf-static

diff --git a/libbpfgo.h b/libbpfgo.h
@@ -14,6 +14,7 @@
 
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
+#include <linux/bpf.h> // uapi
 
 int libbpf_print_fn(enum libbpf_print_level level, // libbpf print level
                     const char *format,            // format used for the msg

diff --git a/samples/fentry/main.bpf.c b/samples/fentry/main.bpf.c
@@ -1,8 +1,10 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm

diff --git a/selftest/build/Makefile b/selftest/build/Makefile
@@ -18,14 +18,10 @@ all: $(TEST).bpf.o
 outputdir:
 	$(MAKE) -C $(BASEDIR) outputdir
 
-vmlinuxh: outputdir
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-
 ## test bpf dependency
 
 $(TEST).bpf.o: $(TEST).bpf.c
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -c $< -o $@
+	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -I$(abspath ../common) -c $< -o $@
 
 ## clean
 

diff --git a/selftest/build/libbpfgo_test.bpf.c b/selftest/build/libbpfgo_test.bpf.c
@@ -1,8 +1,10 @@
 //+build ignore
-#include <vmlinux.h>
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+#include "vmlinux.h"
+
 char LICENSE[] SEC("license") = "Dual BSD/GPL";
 
 struct {

diff --git a/selftest/cgroup-legacy/main.bpf.c b/selftest/cgroup-legacy/main.bpf.c
@@ -1,11 +1,15 @@
 //+build ignore
-#include <vmlinux.h>
-
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>
 #include <bpf/bpf_endian.h>
 
+#include <netinet/ip_icmp.h>
+#include <netinet/ip.h>
+
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm

diff --git a/selftest/cgroup/main.bpf.c b/selftest/cgroup/main.bpf.c
@@ -1,8 +1,10 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm

diff --git a/selftest/common/Makefile b/selftest/common/Makefile
@@ -14,7 +14,7 @@ ARCH := $(shell uname -m | sed 's/x86_64/amd64/g; s/aarch64/arm64/g')
 CFLAGS = -g -O2 -Wall -fpie
 LDFLAGS =
 
-CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT))"
+CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT)) -I$(abspath ../common)"
 CGO_LDFLAGS_STATIC = "-lelf -lz $(LIBBPF_OBJ)"
 CGO_EXTLDFLAGS_STATIC = '-w -extldflags "-static"'
 
@@ -41,17 +41,13 @@ libbpfgo-static:
 libbpfgo-dynamic:
 	$(MAKE) -C $(BASEDIR) libbpfgo-dynamic
 
-vmlinuxh:
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-
 outputdir:
 	$(MAKE) -C $(BASEDIR) outputdir
 
 ## test bpf dependency
 
 $(MAIN).bpf.o: $(MAIN).bpf.c
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -c $< -o $@
+	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -I$(abspath ../common) -c $< -o $@
 
 ## test
 

diff --git a/selftest/common/vmlinux.h b/selftest/common/vmlinux.h
@@ -0,0 +1,32 @@
+#ifndef __VMLINUX_H__
+#define __VMLINUX_H__
+
+typedef __u8 u8;
+
+typedef __s16 s16;
+
+typedef __u16 u16;
+
+typedef __s32 s32;
+
+typedef __u32 u32;
+
+typedef __s64 s64;
+
+typedef __u64 u64;
+
+struct trace_entry {
+	short unsigned int type;
+	unsigned char flags;
+	unsigned char preempt_count;
+	int pid;
+};
+
+struct trace_event_raw_sys_enter {
+	struct trace_entry ent;
+	long int id;
+	long unsigned int args[6];
+	char __data[0];
+};
+
+#endif /* __VMLINUX_H__ */
diff --git a/selftest/create-map/main.bpf.c b/selftest/create-map/main.bpf.c
@@ -1,5 +1,5 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
 SEC("kprobe/sys_execve")

diff --git a/selftest/error-handling/main.bpf.c b/selftest/error-handling/main.bpf.c
@@ -1,5 +1,5 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
 SEC("kprobe/sys_mmap")

diff --git a/selftest/global-variable/main.bpf.c b/selftest/global-variable/main.bpf.c
@@ -1,8 +1,10 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm

diff --git a/selftest/iterators/main.bpf.c b/selftest/iterators/main.bpf.c
@@ -1,7 +1,9 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm

diff --git a/selftest/map-batch/main.bpf.c b/selftest/map-batch/main.bpf.c
@@ -1,7 +1,9 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
+#include "vmlinux.h"
+
 struct {
     __uint(type, BPF_MAP_TYPE_HASH);
     __type(key, u32);

diff --git a/selftest/map-pin-info/main.bpf.c b/selftest/map-pin-info/main.bpf.c
@@ -1,7 +1,9 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
+#include "vmlinux.h"
+
 struct value {
 	int x;
 	char y;

diff --git a/selftest/map-update/main.bpf.c b/selftest/map-update/main.bpf.c
@@ -1,7 +1,9 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
+#include "vmlinux.h"
+
 struct value {
     int x;
     char y;
@@ -30,7 +32,7 @@ int kprobe__sys_mmap(struct pt_regs *ctx)
     }
     bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, v1, sizeof(struct value));
 
-    int64_t secondKey = 42069420;
+    s64 secondKey = 42069420;
     struct value *v2 = bpf_map_lookup_elem(&tester, &secondKey);
     if (!v2) {
         return 1;

diff --git a/selftest/multiple-objects/Makefile b/selftest/multiple-objects/Makefile
@@ -14,12 +14,12 @@ ARCH := $(shell uname -m | sed 's/x86_64/amd64/g; s/aarch64/arm64/g')
 CFLAGS = -g -O2 -Wall -fpie
 LDFLAGS =
 
-CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT))"
+CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT)) -I$(abspath ../common)"
 CGO_LDFLAGS_STATIC = "-lelf -lz $(LIBBPF_OBJ)"
 CGO_EXTLDFLAGS_STATIC = '-w -extldflags "-static"'
 
 CGO_CFLAGS_DYN = "-I. -I/usr/include/"
-CGO_LDFLAGS_DYN = "-lelf -lz -lbpf"
+CGO_LDFLAGS_DYN = "-lelf -lz -lbpf"	
 
 MAIN = main
 FIRST = first
@@ -44,25 +44,19 @@ libbpfgo-static:
 libbpfgo-dynamic:
 	$(MAKE) -C $(BASEDIR) libbpfgo-dynamic
 
-vmlinuxh:
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-
 outputdir:
 	$(MAKE) -C $(BASEDIR) outputdir
 
 ## test bpf dependency
 
 $(FIRST).bpf.o: $(FIRST).bpf.c
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -c $< -o $@
+	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -I$(abspath ../common) -c $< -o $@
 
 $(SECOND).bpf.o: $(SECOND).bpf.c
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -c $< -o $@
+	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -I$(abspath ../common) -c $< -o $@
 
 $(MAP).bpf.o: $(MAP).bpf.c
-	$(MAKE) -C $(BASEDIR) vmlinuxh
-	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -c $< -o $@
+	$(CLANG) $(CFLAGS) -target bpf -D__TARGET_ARCH_$(ARCH) -I$(OUTPUT) -I$(abspath ../common) -c $< -o $@
 
 ## test
 

diff --git a/selftest/multiple-objects/first.bpf.c b/selftest/multiple-objects/first.bpf.c
@@ -1,5 +1,5 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>

diff --git a/selftest/multiple-objects/map.bpf.c b/selftest/multiple-objects/map.bpf.c
@@ -1,7 +1,6 @@
 //+build ignore
-
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>
-#include "map.bpf.h"
+#include "map.bpf.h"
diff --git a/selftest/multiple-objects/map.bpf.h b/selftest/multiple-objects/map.bpf.h
@@ -1,10 +1,10 @@
 //+build ignore
-
-#include "vmlinux.h"
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>
 
+#include "vmlinux.h"
+
 struct {
     __uint(pinning, LIBBPF_PIN_BY_NAME);
     __uint(type, BPF_MAP_TYPE_RINGBUF);

diff --git a/selftest/multiple-objects/second.bpf.c b/selftest/multiple-objects/second.bpf.c
@@ -1,5 +1,5 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>

diff --git a/selftest/netns/main.bpf.c b/selftest/netns/main.bpf.c
@@ -1,8 +1,10 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm

diff --git a/selftest/object-iterator/main.bpf.c b/selftest/object-iterator/main.bpf.c
@@ -1,8 +1,10 @@
 //+build ignore
-#include "vmlinux.h"
+#include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+#include "vmlinux.h"
+
 #ifdef asm_inline
 #undef asm_inline
 #define asm_inline asm