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    Subject[RFC nf-next v1 2/2] selftests/bpf: Add netfilter link prog update test
    Date
    From: "D. Wythe" <alibuda@linux.alibaba.com>

    Update prog for active links and verify whether
    the prog has been successfully replaced.

    Expected output:

    ./test_progs -t netfilter_link_update_prog
    Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

    Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
    ---
    .../bpf/prog_tests/netfilter_link_update_prog.c | 83 ++++++++++++++++++++++
    .../bpf/progs/test_netfilter_link_update_prog.c | 24 +++++++
    2 files changed, 107 insertions(+)
    create mode 100644 tools/testing/selftests/bpf/prog_tests/netfilter_link_update_prog.c
    create mode 100644 tools/testing/selftests/bpf/progs/test_netfilter_link_update_prog.c

    diff --git a/tools/testing/selftests/bpf/prog_tests/netfilter_link_update_prog.c b/tools/testing/selftests/bpf/prog_tests/netfilter_link_update_prog.c
    new file mode 100644
    index 00000000..d23b544
    --- /dev/null
    +++ b/tools/testing/selftests/bpf/prog_tests/netfilter_link_update_prog.c
    @@ -0,0 +1,83 @@
    +// SPDX-License-Identifier: GPL-2.0-or-later
    +
    +#include <test_progs.h>
    +#include <linux/netfilter.h>
    +#include <network_helpers.h>
    +#include "test_netfilter_link_update_prog.skel.h"
    +
    +#define SERVER_ADDR "127.0.0.1"
    +#define SERVER_PORT 12345
    +
    +static const char dummy_message[] = "A dummy message";
    +
    +static int send_dummy(int client_fd)
    +{
    + struct sockaddr_storage saddr;
    + struct sockaddr *saddr_p;
    + socklen_t saddr_len;
    + int err;
    +
    + saddr_p = (struct sockaddr *)&saddr;
    + err = make_sockaddr(AF_INET, SERVER_ADDR, SERVER_PORT, &saddr, &saddr_len);
    + if (!ASSERT_OK(err, "make_sockaddr"))
    + return -1;
    +
    + err = sendto(client_fd, dummy_message, sizeof(dummy_message) - 1, 0, saddr_p, saddr_len);
    + if (!ASSERT_GE(err, 0, "sendto"))
    + return -1;
    +
    + return 0;
    +}
    +
    +void test_netfilter_link_update_prog(void)
    +{
    + LIBBPF_OPTS(bpf_netfilter_opts, opts,
    + .pf = NFPROTO_IPV4,
    + .hooknum = NF_INET_LOCAL_OUT,
    + .priority = 100);
    + struct test_netfilter_link_update_prog *skel;
    + struct bpf_program *prog;
    + int server_fd, client_fd;
    + int err;
    +
    + skel = test_netfilter_link_update_prog__open_and_load();
    + if (!ASSERT_OK_PTR(skel, "test_netfilter_link_update_prog__open_and_load"))
    + goto out;
    +
    + prog = skel->progs.nf_link_prog;
    +
    + if (!ASSERT_OK_PTR(prog, "load program"))
    + goto out;
    +
    + skel->links.nf_link_prog = bpf_program__attach_netfilter(prog, &opts);
    + if (!ASSERT_OK_PTR(skel->links.nf_link_prog, "attach netfilter program"))
    + goto out;
    +
    + server_fd = start_server(AF_INET, SOCK_DGRAM, SERVER_ADDR, SERVER_PORT, 0);
    + if (!ASSERT_GE(server_fd, 0, "start_server"))
    + goto out;
    +
    + client_fd = connect_to_fd(server_fd, 0);
    + if (!ASSERT_GE(client_fd, 0, "connect_to_fd"))
    + goto out;
    +
    + send_dummy(client_fd);
    +
    + ASSERT_EQ(skel->bss->counter, 0, "counter should be zero");
    +
    + err = bpf_link__update_program(skel->links.nf_link_prog, skel->progs.nf_link_prog_new);
    + if (!ASSERT_OK(err, "bpf_link__update_program"))
    + goto out;
    +
    + send_dummy(client_fd);
    + ASSERT_GE(skel->bss->counter, 0, "counter should be greater than zero");
    +out:
    + if (client_fd > 0)
    + close(client_fd);
    + if (server_fd > 0)
    + close(server_fd);
    +
    + test_netfilter_link_update_prog__destroy(skel);
    +}
    +
    +
    diff --git a/tools/testing/selftests/bpf/progs/test_netfilter_link_update_prog.c b/tools/testing/selftests/bpf/progs/test_netfilter_link_update_prog.c
    new file mode 100644
    index 00000000..42ae332
    --- /dev/null
    +++ b/tools/testing/selftests/bpf/progs/test_netfilter_link_update_prog.c
    @@ -0,0 +1,24 @@
    +// SPDX-License-Identifier: GPL-2.0-or-later
    +
    +#include "vmlinux.h"
    +#include <bpf/bpf_helpers.h>
    +
    +#define NF_ACCEPT 1
    +
    +SEC("netfilter")
    +int nf_link_prog(struct bpf_nf_ctx *ctx)
    +{
    + return NF_ACCEPT;
    +}
    +
    +u64 counter = 0;
    +
    +SEC("netfilter")
    +int nf_link_prog_new(struct bpf_nf_ctx *ctx)
    +{
    + counter++;
    + return NF_ACCEPT;
    +}
    +
    +char _license[] SEC("license") = "GPL";
    +
    --
    1.8.3.1

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