ebpf: Update eBPF map to BTF defined map

legacy map definition is removed from libbpf1.0+. update the legacy map definition to BTF defined map. Distros with < libbpf1.0 (0.5, 0.6, 0.7, 0.8) bpf_helpers.h support BTF map definition, this change does not break old libbpf and support new libpbf1.0+. Bug: #6250 Signed-off-by: Vincent Li <[email protected]> Co-authored-by: Victor Julien <[email protected]>
OISF · Dec 5, 2023 · ef4c855 · ef4c855
1 parent 13cc493
commit ef4c855
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Showing 11 changed files with 135 additions and 473 deletions.
diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
@@ -2430,7 +2430,6 @@ jobs:
                 zlib1g \
                 zlib1g-dev \
                 clang \
-                libbpf-dev \
                 libelf-dev
       - name: Install Rust
         run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain $RUST_VERSION_KNOWN -y
@@ -2448,7 +2447,7 @@ jobs:
           cp prep/cbindgen $HOME/.cargo/bin
           chmod 755 $HOME/.cargo/bin/cbindgen
       - run: ./autogen.sh
-      - run: CFLAGS="${DEFAULT_CFLAGS}" ./configure --enable-unittests --enable-fuzztargets --enable-ebpf --enable-ebpf-build
+      - run: CFLAGS="${DEFAULT_CFLAGS}" ./configure --enable-unittests --enable-fuzztargets
       - run: make -j2
       - run: make check
       - run: tar xf prep/suricata-verify.tar.gz

diff --git a/configure.ac b/configure.ac
@@ -482,6 +482,23 @@
                     AC_SUBST(LLC)
                   ],
                   [AC_MSG_ERROR([clang needed to build ebpf files])])
+            AC_MSG_CHECKING([libbpf has bpf/bpf_helpers.h])
+            AC_COMPILE_IFELSE(
+                [AC_LANG_PROGRAM(
+                    [
+                        #include <stddef.h>
+                        #include <linux/bpf.h>
+                        #include <bpf/bpf_helpers.h>
+                    ],
+                    [
+                    ])],
+                [HAVE_BPF="yes"],
+                [HAVE_BPF="no"])
+            if test "$HAVE_BPF" = "no"; then
+                AC_MSG_ERROR([libbpf include bpf/bpf_helpers.h not found])
+            else
+                AC_MSG_RESULT([ok])
+            fi
           ])
 
   # enable debug output

diff --git a/ebpf/Makefile.am b/ebpf/Makefile.am
@@ -1,5 +1,5 @@
 EXTRA_DIST= include bypass_filter.c filter.c lb.c vlan_filter.c xdp_filter.c \
-	    xdp_lb.c bpf_helpers.h hash_func01.h
+	    xdp_lb.c hash_func01.h
 
 if BUILD_EBPF
 
@@ -18,7 +18,7 @@ all: $(BPF_TARGETS)
 
 $(BPF_TARGETS): %.bpf: %.c
 #      From C-code to LLVM-IR format suffix .ll (clang -S -emit-llvm)
-	${CLANG} -Wall $(BPF_CFLAGS) -O2 \
+	${CLANG} -Wall $(BPF_CFLAGS) -O2 -g \
 		-I/usr/include/$(build_cpu)-$(build_os)/ \
 		-D__KERNEL__ -D__ASM_SYSREG_H \
 		-target bpf -S -emit-llvm $< -o ${@:.bpf=.ll}