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authorDaniel Borkmann <dborkman@redhat.com>2013-12-11 23:43:44 +0100
committerDavid S. Miller <davem@davemloft.net>2013-12-11 20:28:35 -0500
commit3f356385e8a449e1d7cfc6b6f8d634ac4f5581a0 (patch)
tree6f330ea61260191ce50d539f0b95f3c3b26d0a00 /tools/net/Makefile
parentfilter: bpf_dbg: add minimal bpf debugger (diff)
downloadlinux-dev-3f356385e8a449e1d7cfc6b6f8d634ac4f5581a0.tar.xz
linux-dev-3f356385e8a449e1d7cfc6b6f8d634ac4f5581a0.zip
filter: bpf_asm: add minimal bpf asm tool
There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/net/Makefile')
-rw-r--r--tools/net/Makefile18
1 files changed, 16 insertions, 2 deletions
diff --git a/tools/net/Makefile b/tools/net/Makefile
index 0f30d923afa0..004cd74734b6 100644
--- a/tools/net/Makefile
+++ b/tools/net/Makefile
@@ -1,8 +1,16 @@
prefix = /usr
CC = gcc
+LEX = flex
+YACC = bison
-all : bpf_jit_disasm bpf_dbg
+%.yacc.c: %.y
+ $(YACC) -o $@ -d $<
+
+%.lex.c: %.l
+ $(LEX) -o $@ $<
+
+all : bpf_jit_disasm bpf_dbg bpf_asm
bpf_jit_disasm : CFLAGS = -Wall -O2
bpf_jit_disasm : LDLIBS = -lopcodes -lbfd -ldl
@@ -12,9 +20,15 @@ bpf_dbg : CFLAGS = -Wall -O2
bpf_dbg : LDLIBS = -lreadline
bpf_dbg : bpf_dbg.o
+bpf_asm : CFLAGS = -Wall -O2 -I.
+bpf_asm : LDLIBS =
+bpf_asm : bpf_asm.o bpf_exp.yacc.o bpf_exp.lex.o
+bpf_exp.lex.o : bpf_exp.yacc.c
+
clean :
- rm -rf *.o bpf_jit_disasm bpf_dbg
+ rm -rf *.o bpf_jit_disasm bpf_dbg bpf_asm bpf_exp.yacc.* bpf_exp.lex.*
install :
install bpf_jit_disasm $(prefix)/bin/bpf_jit_disasm
install bpf_dbg $(prefix)/bin/bpf_dbg
+ install bpf_asm $(prefix)/bin/bpf_asm