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authorDaniel Borkmann <dborkman@redhat.com>2013-12-11 23:43:43 +0100
committerDavid S. Miller <davem@davemloft.net>2013-12-11 20:28:35 -0500
commitfd981e3c321a7e8661e06fa6077aea89e8228c3a (patch)
treeb8bc8399aef71c13ed1f971288ac75d624c85e6c /tools/net/Makefile
parentnet: eth: cpsw: 64-bit phys_addr_t and sparse cleanup (diff)
downloadlinux-dev-fd981e3c321a7e8661e06fa6077aea89e8228c3a.tar.xz
linux-dev-fd981e3c321a7e8661e06fa6077aea89e8228c3a.zip
filter: bpf_dbg: add minimal bpf debugger
This patch adds a minimal BPF debugger that "emulates" the kernel's BPF engine (w/o extensions) and allows for single stepping (forwards and backwards through BPF code) or running with >=1 breakpoints through selected or all packets from a pcap file with a provided user filter in order to facilitate verification of a BPF program. When a breakpoint is being hit, it dumps all register contents, decoded instructions and in case of branches both decoded branch targets as well as other useful information. Having this facility is in particular useful to verify BPF programs against given test traffic *before* attaching to a live system. With the general availability of cls_bpf, xt_bpf, socket filters, team driver and e.g. PTP code, all BPF users, quite often a single more complex BPF program is being used. Reasons for a more complex BPF program are primarily to optimize execution time for making a verdict when multiple simple BPF programs are combined into one in order to prevent parsing same headers multiple times. In particular, for cls_bpf that can have various return paths for encoding flowids, and xt_bpf to come to a fw verdict this can be the case. Therefore, as this can result in more complex and harder to debug code, it would be very useful to have this minimal tool for testing purposes. It can also be of help for BPF JIT developers as filters are "test attached" to the kernel on a temporary socket thus triggering a JIT image dump when enabled. The tool uses an interactive libreadline shell with auto-completion and history support. 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/Makefile9
1 files changed, 7 insertions, 2 deletions
diff --git a/tools/net/Makefile b/tools/net/Makefile
index b4444d53b73f..0f30d923afa0 100644
--- a/tools/net/Makefile
+++ b/tools/net/Makefile
@@ -2,14 +2,19 @@ prefix = /usr
CC = gcc
-all : bpf_jit_disasm
+all : bpf_jit_disasm bpf_dbg
bpf_jit_disasm : CFLAGS = -Wall -O2
bpf_jit_disasm : LDLIBS = -lopcodes -lbfd -ldl
bpf_jit_disasm : bpf_jit_disasm.o
+bpf_dbg : CFLAGS = -Wall -O2
+bpf_dbg : LDLIBS = -lreadline
+bpf_dbg : bpf_dbg.o
+
clean :
- rm -rf *.o bpf_jit_disasm
+ rm -rf *.o bpf_jit_disasm bpf_dbg
install :
install bpf_jit_disasm $(prefix)/bin/bpf_jit_disasm
+ install bpf_dbg $(prefix)/bin/bpf_dbg