From 1d8a0af5ee1ad219a9ebd9b43559b165bcb3ff40 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= Date: Fri, 24 Apr 2020 15:34:28 +0200 Subject: selftests/bpf: Add test for freplace program with expected_attach_type MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This adds a new selftest that tests the ability to attach an freplace program to a program type that relies on the expected_attach_type of the target program to pass verification. Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/158773526831.293902.16011743438619684815.stgit@toke.dk --- .../selftests/bpf/prog_tests/fexit_bpf2bpf.c | 30 +++++++++++++++++----- tools/testing/selftests/bpf/progs/connect4_prog.c | 28 +++++++++++--------- .../selftests/bpf/progs/freplace_connect4.c | 18 +++++++++++++ 3 files changed, 58 insertions(+), 18 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/freplace_connect4.c diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c index cde463af7071..c2642517e1d8 100644 --- a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c +++ b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c @@ -5,7 +5,8 @@ static void test_fexit_bpf2bpf_common(const char *obj_file, const char *target_obj_file, int prog_cnt, - const char **prog_name) + const char **prog_name, + bool run_prog) { struct bpf_object *obj = NULL, *pkt_obj; int err, pkt_fd, i; @@ -18,7 +19,8 @@ static void test_fexit_bpf2bpf_common(const char *obj_file, err = bpf_prog_load(target_obj_file, BPF_PROG_TYPE_UNSPEC, &pkt_obj, &pkt_fd); - if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno)) + if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n", + target_obj_file, err, errno)) return; DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, .attach_prog_fd = pkt_fd, @@ -33,7 +35,7 @@ static void test_fexit_bpf2bpf_common(const char *obj_file, obj = bpf_object__open_file(obj_file, &opts); if (CHECK(IS_ERR_OR_NULL(obj), "obj_open", - "failed to open fexit_bpf2bpf: %ld\n", + "failed to open %s: %ld\n", obj_file, PTR_ERR(obj))) goto close_prog; @@ -49,6 +51,10 @@ static void test_fexit_bpf2bpf_common(const char *obj_file, if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n")) goto close_prog; } + + if (!run_prog) + goto close_prog; + data_map = bpf_object__find_map_by_name(obj, "fexit_bp.bss"); if (CHECK(!data_map, "find_data_map", "data map not found\n")) goto close_prog; @@ -89,7 +95,7 @@ static void test_target_no_callees(void) test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.o", "./test_pkt_md_access.o", ARRAY_SIZE(prog_name), - prog_name); + prog_name, true); } static void test_target_yes_callees(void) @@ -103,7 +109,7 @@ static void test_target_yes_callees(void) test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o", "./test_pkt_access.o", ARRAY_SIZE(prog_name), - prog_name); + prog_name, true); } static void test_func_replace(void) @@ -120,7 +126,18 @@ static void test_func_replace(void) test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o", "./test_pkt_access.o", ARRAY_SIZE(prog_name), - prog_name); + prog_name, true); +} + +static void test_func_replace_verify(void) +{ + const char *prog_name[] = { + "freplace/do_bind", + }; + test_fexit_bpf2bpf_common("./freplace_connect4.o", + "./connect4_prog.o", + ARRAY_SIZE(prog_name), + prog_name, false); } void test_fexit_bpf2bpf(void) @@ -128,4 +145,5 @@ void test_fexit_bpf2bpf(void) test_target_no_callees(); test_target_yes_callees(); test_func_replace(); + test_func_replace_verify(); } diff --git a/tools/testing/selftests/bpf/progs/connect4_prog.c b/tools/testing/selftests/bpf/progs/connect4_prog.c index 75085119c5bb..ad3c498a8150 100644 --- a/tools/testing/selftests/bpf/progs/connect4_prog.c +++ b/tools/testing/selftests/bpf/progs/connect4_prog.c @@ -18,11 +18,25 @@ int _version SEC("version") = 1; +__attribute__ ((noinline)) +int do_bind(struct bpf_sock_addr *ctx) +{ + struct sockaddr_in sa = {}; + + sa.sin_family = AF_INET; + sa.sin_port = bpf_htons(0); + sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4); + + if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0) + return 0; + + return 1; +} + SEC("cgroup/connect4") int connect_v4_prog(struct bpf_sock_addr *ctx) { struct bpf_sock_tuple tuple = {}; - struct sockaddr_in sa; struct bpf_sock *sk; /* Verify that new destination is available. */ @@ -56,17 +70,7 @@ int connect_v4_prog(struct bpf_sock_addr *ctx) ctx->user_ip4 = bpf_htonl(DST_REWRITE_IP4); ctx->user_port = bpf_htons(DST_REWRITE_PORT4); - /* Rewrite source. */ - memset(&sa, 0, sizeof(sa)); - - sa.sin_family = AF_INET; - sa.sin_port = bpf_htons(0); - sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4); - - if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0) - return 0; - - return 1; + return do_bind(ctx) ? 1 : 0; } char _license[] SEC("license") = "GPL"; diff --git a/tools/testing/selftests/bpf/progs/freplace_connect4.c b/tools/testing/selftests/bpf/progs/freplace_connect4.c new file mode 100644 index 000000000000..a0ae84230699 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/freplace_connect4.c @@ -0,0 +1,18 @@ +#include +#include +#include +#include +#include +#include +#include + +SEC("freplace/do_bind") +int new_do_bind(struct bpf_sock_addr *ctx) +{ + struct sockaddr_in sa = {}; + + bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)); + return 0; +} + +char _license[] SEC("license") = "GPL"; -- cgit v1.2.3