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selftests/bpf: add simple BPF_PROG_TEST_RUN examples for flow dissector 

Use existing pkt_v4 and pkt_v6 to make sure flow_keys are what we want.

Also, add new bpf_flow_load routine (and flow_dissector_load.h header)
that loads bpf_flow.o program and does all required setup.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev 2019-01-28 08:53:55 -08:00 committed by Daniel Borkmann
parent b7a1848e83
commit bf0f0fd939
4 changed files with 139 additions and 40 deletions
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3
tools/testing/selftests/bpf/Makefile
View File

@ -148,6 +148,9 @@ $(OUTPUT)/test_xdp_noinline.o: CLANG_FLAGS += -fno-inline
$(OUTPUT)/test_queue_map.o: test_queue_stack_map.h
$(OUTPUT)/test_stack_map.o: test_queue_stack_map.h
$(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
$(OUTPUT)/test_progs.o: flow_dissector_load.h
BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')

43
tools/testing/selftests/bpf/flow_dissector_load.c
View File

@ -12,6 +12,7 @@
#include <bpf/libbpf.h>
#include "bpf_rlimit.h"
#include "flow_dissector_load.h"
const char *cfg_pin_path = "/sys/fs/bpf/flow_dissector";
const char *cfg_map_name = "jmp_table";
@ -21,46 +22,13 @@ char *cfg_path_name;
static void load_and_attach_program(void)
{
struct bpf_program *prog, *main_prog;
struct bpf_map *prog_array;
int i, fd, prog_fd, ret;
int prog_fd, ret;
struct bpf_object *obj;
int prog_array_fd;
ret = bpf_prog_load(cfg_path_name, BPF_PROG_TYPE_FLOW_DISSECTOR, &obj,
&prog_fd);
ret = bpf_flow_load(&obj, cfg_path_name, cfg_section_name,
cfg_map_name, &prog_fd);
if (ret)
error(1, 0, "bpf_prog_load %s", cfg_path_name);
main_prog = bpf_object__find_program_by_title(obj, cfg_section_name);
if (!main_prog)
error(1, 0, "bpf_object__find_program_by_title %s",
cfg_section_name);
prog_fd = bpf_program__fd(main_prog);
if (prog_fd < 0)
error(1, 0, "bpf_program__fd");
prog_array = bpf_object__find_map_by_name(obj, cfg_map_name);
if (!prog_array)
error(1, 0, "bpf_object__find_map_by_name %s", cfg_map_name);
prog_array_fd = bpf_map__fd(prog_array);
if (prog_array_fd < 0)
error(1, 0, "bpf_map__fd %s", cfg_map_name);
i = 0;
bpf_object__for_each_program(prog, obj) {
fd = bpf_program__fd(prog);
if (fd < 0)
error(1, 0, "bpf_program__fd");
if (fd != prog_fd) {
printf("%d: %s\n", i, bpf_program__title(prog, false));
bpf_map_update_elem(prog_array_fd, &i, &fd, BPF_ANY);
++i;
}
}
error(1, 0, "bpf_flow_load %s", cfg_path_name);
ret = bpf_prog_attach(prog_fd, 0 /* Ignore */, BPF_FLOW_DISSECTOR, 0);
if (ret)
@ -69,7 +37,6 @@ static void load_and_attach_program(void)
ret = bpf_object__pin(obj, cfg_pin_path);
if (ret)
error(1, 0, "bpf_object__pin %s", cfg_pin_path);
}
static void detach_program(void)

55
tools/testing/selftests/bpf/flow_dissector_load.h Normal file
View File

@ -0,0 +1,55 @@
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
#ifndef FLOW_DISSECTOR_LOAD
#define FLOW_DISSECTOR_LOAD
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
static inline int bpf_flow_load(struct bpf_object **obj,
const char *path,
const char *section_name,
const char *map_name,
int *prog_fd)
{
struct bpf_program *prog, *main_prog;
struct bpf_map *prog_array;
int prog_array_fd;
int ret, fd, i;
ret = bpf_prog_load(path, BPF_PROG_TYPE_FLOW_DISSECTOR, obj,
prog_fd);
if (ret)
return ret;
main_prog = bpf_object__find_program_by_title(*obj, section_name);
if (!main_prog)
return ret;
*prog_fd = bpf_program__fd(main_prog);
if (*prog_fd < 0)
return ret;
prog_array = bpf_object__find_map_by_name(*obj, map_name);
if (!prog_array)
return ret;
prog_array_fd = bpf_map__fd(prog_array);
if (prog_array_fd < 0)
return ret;
i = 0;
bpf_object__for_each_program(prog, *obj) {
fd = bpf_program__fd(prog);
if (fd < 0)
return fd;
if (fd != *prog_fd) {
bpf_map_update_elem(prog_array_fd, &i, &fd, BPF_ANY);
++i;
}
}
return 0;
}
#endif /* FLOW_DISSECTOR_LOAD */

78
tools/testing/selftests/bpf/test_progs.c
View File

@ -39,6 +39,7 @@ typedef __u16 __sum16;
#include "bpf_endian.h"
#include "bpf_rlimit.h"
#include "trace_helpers.h"
#include "flow_dissector_load.h"
static int error_cnt, pass_cnt;
static bool jit_enabled;
@ -53,9 +54,10 @@ static struct {
} __packed pkt_v4 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
.iph.ihl = 5,
.iph.protocol = 6,
.iph.protocol = IPPROTO_TCP,
.iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
/* ipv6 test vector */
@ -65,9 +67,10 @@ static struct {
struct tcphdr tcp;
} __packed pkt_v6 = {
.eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
.iph.nexthdr = 6,
.iph.nexthdr = IPPROTO_TCP,
.iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
.tcp.doff = 5,
};
#define _CHECK(condition, tag, duration, format...) ({ \
@ -1882,6 +1885,76 @@ out:
bpf_object__close(obj);
}
#define CHECK_FLOW_KEYS(desc, got, expected) \
CHECK(memcmp(&got, &expected, sizeof(got)) != 0, \
desc, \
"nhoff=%u/%u " \
"thoff=%u/%u " \
"addr_proto=0x%x/0x%x " \
"is_frag=%u/%u " \
"is_first_frag=%u/%u " \
"is_encap=%u/%u " \
"n_proto=0x%x/0x%x " \
"sport=%u/%u " \
"dport=%u/%u\n", \
got.nhoff, expected.nhoff, \
got.thoff, expected.thoff, \
got.addr_proto, expected.addr_proto, \
got.is_frag, expected.is_frag, \
got.is_first_frag, expected.is_first_frag, \
got.is_encap, expected.is_encap, \
got.n_proto, expected.n_proto, \
got.sport, expected.sport, \
got.dport, expected.dport)
static struct bpf_flow_keys pkt_v4_flow_keys = {
.nhoff = 0,
.thoff = sizeof(struct iphdr),
.addr_proto = ETH_P_IP,
.ip_proto = IPPROTO_TCP,
.n_proto = bpf_htons(ETH_P_IP),
};
static struct bpf_flow_keys pkt_v6_flow_keys = {
.nhoff = 0,
.thoff = sizeof(struct ipv6hdr),
.addr_proto = ETH_P_IPV6,
.ip_proto = IPPROTO_TCP,
.n_proto = bpf_htons(ETH_P_IPV6),
};
static void test_flow_dissector(void)
{
struct bpf_flow_keys flow_keys;
struct bpf_object *obj;
__u32 duration, retval;
int err, prog_fd;
__u32 size;
err = bpf_flow_load(&obj, "./bpf_flow.o", "flow_dissector",
"jmp_table", &prog_fd);
if (err) {
error_cnt++;
return;
}
err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4),
&flow_keys, &size, &retval, &duration);
CHECK(size != sizeof(flow_keys) || err || retval != 1, "ipv4",
"err %d errno %d retval %d duration %d size %u/%lu\n",
err, errno, retval, duration, size, sizeof(flow_keys));
CHECK_FLOW_KEYS("ipv4_flow_keys", flow_keys, pkt_v4_flow_keys);
err = bpf_prog_test_run(prog_fd, 10, &pkt_v6, sizeof(pkt_v6),
&flow_keys, &size, &retval, &duration);
CHECK(size != sizeof(flow_keys) || err || retval != 1, "ipv6",
"err %d errno %d retval %d duration %d size %u/%lu\n",
err, errno, retval, duration, size, sizeof(flow_keys));
CHECK_FLOW_KEYS("ipv6_flow_keys", flow_keys, pkt_v6_flow_keys);
bpf_object__close(obj);
}
int main(void)
{
srand(time(NULL));
@ -1909,6 +1982,7 @@ int main(void)
test_reference_tracking();
test_queue_stack_map(QUEUE);
test_queue_stack_map(STACK);
test_flow_dissector();
printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;