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selftest/bpf: Simple test for fentry/fexit

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Add simple test for fentry and fexit programs around eth_type_trans.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-8-ast@kernel.org
This commit is contained in:
Alexei Starovoitov 2019-11-14 10:57:07 -08:00 committed by Daniel Borkmann
parent b8c54ea455
commit e41074d39d
2 changed files with 88 additions and 3 deletions
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39
tools/testing/selftests/bpf/prog_tests/kfree_skb.c
View File

@ -60,15 +60,17 @@ void test_kfree_skb(void)
.file = "./kfree_skb.o",
};
struct bpf_link *link = NULL, *link_fentry = NULL, *link_fexit = NULL;
struct bpf_map *perf_buf_map, *global_data;
struct bpf_program *prog, *fentry, *fexit;
struct bpf_object *obj, *obj2 = NULL;
struct perf_buffer_opts pb_opts = {};
struct perf_buffer *pb = NULL;
struct bpf_link *link = NULL;
struct bpf_map *perf_buf_map;
struct bpf_program *prog;
int err, kfree_skb_fd;
bool passed = false;
__u32 duration = 0;
const int zero = 0;
bool test_ok[2];
err = bpf_prog_load("./test_pkt_access.o", BPF_PROG_TYPE_SCHED_CLS,
&obj, &tattr.prog_fd);
@ -82,9 +84,28 @@ void test_kfree_skb(void)
prog = bpf_object__find_program_by_title(obj2, "tp_btf/kfree_skb");
if (CHECK(!prog, "find_prog", "prog kfree_skb not found\n"))
goto close_prog;
fentry = bpf_object__find_program_by_title(obj2, "fentry/eth_type_trans");
if (CHECK(!fentry, "find_prog", "prog eth_type_trans not found\n"))
goto close_prog;
fexit = bpf_object__find_program_by_title(obj2, "fexit/eth_type_trans");
if (CHECK(!fexit, "find_prog", "prog eth_type_trans not found\n"))
goto close_prog;
global_data = bpf_object__find_map_by_name(obj2, "kfree_sk.bss");
if (CHECK(!global_data, "find global data", "not found\n"))
goto close_prog;
link = bpf_program__attach_raw_tracepoint(prog, NULL);
if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link)))
goto close_prog;
link_fentry = bpf_program__attach_trace(fentry);
if (CHECK(IS_ERR(link_fentry), "attach fentry", "err %ld\n",
PTR_ERR(link_fentry)))
goto close_prog;
link_fexit = bpf_program__attach_trace(fexit);
if (CHECK(IS_ERR(link_fexit), "attach fexit", "err %ld\n",
PTR_ERR(link_fexit)))
goto close_prog;
perf_buf_map = bpf_object__find_map_by_name(obj2, "perf_buf_map");
if (CHECK(!perf_buf_map, "find_perf_buf_map", "not found\n"))
@ -108,14 +129,26 @@ void test_kfree_skb(void)
err = perf_buffer__poll(pb, 100);
if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
goto close_prog;
/* make sure kfree_skb program was triggered
* and it sent expected skb into ring buffer
*/
CHECK_FAIL(!passed);
err = bpf_map_lookup_elem(bpf_map__fd(global_data), &zero, test_ok);
if (CHECK(err, "get_result",
"failed to get output data: %d\n", err))
goto close_prog;
CHECK_FAIL(!test_ok[0] || !test_ok[1]);
close_prog:
perf_buffer__free(pb);
if (!IS_ERR_OR_NULL(link))
bpf_link__destroy(link);
if (!IS_ERR_OR_NULL(link_fentry))
bpf_link__destroy(link_fentry);
if (!IS_ERR_OR_NULL(link_fexit))
bpf_link__destroy(link_fexit);
bpf_object__close(obj);
bpf_object__close(obj2);
}

52
tools/testing/selftests/bpf/progs/kfree_skb.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include <stdbool.h>
#include "bpf_helpers.h"
#include "bpf_endian.h"
@ -116,3 +117,54 @@ int trace_kfree_skb(struct trace_kfree_skb *ctx)
&meta, sizeof(meta));
return 0;
}
static volatile struct {
bool fentry_test_ok;
bool fexit_test_ok;
} result;
struct eth_type_trans_args {
struct sk_buff *skb;
struct net_device *dev;
unsigned short protocol; /* return value available to fexit progs */
};
SEC("fentry/eth_type_trans")
int fentry_eth_type_trans(struct eth_type_trans_args *ctx)
{
struct sk_buff *skb = ctx->skb;
struct net_device *dev = ctx->dev;
int len, ifindex;
__builtin_preserve_access_index(({
len = skb->len;
ifindex = dev->ifindex;
}));
/* fentry sees full packet including L2 header */
if (len != 74 || ifindex != 1)
return 0;
result.fentry_test_ok = true;
return 0;
}
SEC("fexit/eth_type_trans")
int fexit_eth_type_trans(struct eth_type_trans_args *ctx)
{
struct sk_buff *skb = ctx->skb;
struct net_device *dev = ctx->dev;
int len, ifindex;
__builtin_preserve_access_index(({
len = skb->len;
ifindex = dev->ifindex;
}));
/* fexit sees packet without L2 header that eth_type_trans should have
* consumed.
*/
if (len != 60 || ctx->protocol != bpf_htons(0x86dd) || ifindex != 1)
return 0;
result.fexit_test_ok = true;
return 0;
}