selftests/bpf: Add bpf_program__attach_netfilter helper test

Call bpf_program__attach_netfilter() with different
protocol/hook/priority combinations.

Test fails if supposedly-illegal attachments work
(e.g., bogus protocol family, illegal priority and so on) or if a
should-work attachment fails.  Expected output:

 ./test_progs -t netfilter_link_attach
 #145/1   netfilter_link_attach/allzero:OK
 #145/2   netfilter_link_attach/invalid-pf:OK
 #145/3   netfilter_link_attach/invalid-hooknum:OK
 #145/4   netfilter_link_attach/invalid-priority-min:OK
 #145/5   netfilter_link_attach/invalid-priority-max:OK
 #145/6   netfilter_link_attach/invalid-flags:OK
 #145/7   netfilter_link_attach/invalid-inet-not-supported:OK
 #145/8   netfilter_link_attach/attach ipv4:OK
 #145/9   netfilter_link_attach/attach ipv6:OK

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/bpf/20230628152738.22765-3-fw@strlen.de

diff --git a/tools/testing/selftests/bpf/prog_tests/netfilter_link_attach.c b/tools/testing/selftests/bpf/prog_tests/netfilter_link_attach.c
new file mode 100644 (file)
index 0000000..4297a2a
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/netfilter_link_attach.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <netinet/in.h>
+#include <linux/netfilter.h>
+
+#include "test_progs.h"
+#include "test_netfilter_link_attach.skel.h"
+
+struct nf_link_test {
+       __u32 pf;
+       __u32 hooknum;
+       __s32 priority;
+       __u32 flags;
+
+       bool expect_success;
+       const char * const name;
+};
+
+static const struct nf_link_test nf_hook_link_tests[] = {
+       { .name = "allzero", },
+       { .pf = NFPROTO_NUMPROTO, .name = "invalid-pf", },
+       { .pf = NFPROTO_IPV4, .hooknum = 42, .name = "invalid-hooknum", },
+       { .pf = NFPROTO_IPV4, .priority = INT_MIN, .name = "invalid-priority-min", },
+       { .pf = NFPROTO_IPV4, .priority = INT_MAX, .name = "invalid-priority-max", },
+       { .pf = NFPROTO_IPV4, .flags = UINT_MAX, .name = "invalid-flags", },
+
+       { .pf = NFPROTO_INET, .priority = 1, .name = "invalid-inet-not-supported", },
+
+       { .pf = NFPROTO_IPV4, .priority = -10000, .expect_success = true, .name = "attach ipv4", },
+       { .pf = NFPROTO_IPV6, .priority =  10001, .expect_success = true, .name = "attach ipv6", },
+};
+
+void test_netfilter_link_attach(void)
+{
+       struct test_netfilter_link_attach *skel;
+       struct bpf_program *prog;
+       LIBBPF_OPTS(bpf_netfilter_opts, opts);
+       int i;
+
+       skel = test_netfilter_link_attach__open_and_load();
+       if (!ASSERT_OK_PTR(skel, "test_netfilter_link_attach__open_and_load"))
+               goto out;
+
+       prog = skel->progs.nf_link_attach_test;
+       if (!ASSERT_OK_PTR(prog, "attach program"))
+               goto out;
+
+       for (i = 0; i < ARRAY_SIZE(nf_hook_link_tests); i++) {
+               struct bpf_link *link;
+
+               if (!test__start_subtest(nf_hook_link_tests[i].name))
+                       continue;
+
+#define X(opts, m, i)  opts.m = nf_hook_link_tests[(i)].m
+               X(opts, pf, i);
+               X(opts, hooknum, i);
+               X(opts, priority, i);
+               X(opts, flags, i);
+#undef X
+               link = bpf_program__attach_netfilter(prog, &opts);
+               if (nf_hook_link_tests[i].expect_success) {
+                       struct bpf_link *link2;
+
+                       if (!ASSERT_OK_PTR(link, "program attach successful"))
+                               continue;
+
+                       link2 = bpf_program__attach_netfilter(prog, &opts);
+                       ASSERT_ERR_PTR(link2, "attach program with same pf/hook/priority");
+
+                       if (!ASSERT_OK(bpf_link__destroy(link), "link destroy"))
+                               break;
+
+                       link2 = bpf_program__attach_netfilter(prog, &opts);
+                       if (!ASSERT_OK_PTR(link2, "program reattach successful"))
+                               continue;
+                       if (!ASSERT_OK(bpf_link__destroy(link2), "link destroy"))
+                               break;
+               } else {
+                       ASSERT_ERR_PTR(link, "program load failure");
+               }
+       }
+
+out:
+       test_netfilter_link_attach__destroy(skel);
+}
+

diff --git a/tools/testing/selftests/bpf/progs/test_netfilter_link_attach.c b/tools/testing/selftests/bpf/progs/test_netfilter_link_attach.c
new file mode 100644 (file)
index 0000000..03a4751
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_netfilter_link_attach.c
@@ -0,0 +1,14 @@
+// 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_attach_test(struct bpf_nf_ctx *ctx)
+{
+       return NF_ACCEPT;
+}
+
+char _license[] SEC("license") = "GPL";