109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include <test_progs.h>
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#include <stdbool.h>
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#include "test_module_attach.skel.h"
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static int duration;
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static int trigger_module_test_writable(int *val)
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{
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int fd, err;
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char buf[65];
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ssize_t rd;
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fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);
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err = -errno;
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if (!ASSERT_GE(fd, 0, "testmode_file_open"))
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return err;
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rd = read(fd, buf, sizeof(buf) - 1);
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err = -errno;
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if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {
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close(fd);
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return err;
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}
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buf[rd] = '\0';
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*val = strtol(buf, NULL, 0);
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close(fd);
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return 0;
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}
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static int delete_module(const char *name, int flags)
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{
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return syscall(__NR_delete_module, name, flags);
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}
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void test_module_attach(void)
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{
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const int READ_SZ = 456;
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const int WRITE_SZ = 457;
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struct test_module_attach* skel;
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struct test_module_attach__bss *bss;
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struct bpf_link *link;
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int err;
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int writable_val = 0;
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skel = test_module_attach__open();
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if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
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return;
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err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
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0, "bpf_testmod_test_read");
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ASSERT_OK(err, "set_attach_target");
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err = test_module_attach__load(skel);
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if (CHECK(err, "skel_load", "failed to load skeleton\n"))
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return;
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bss = skel->bss;
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err = test_module_attach__attach(skel);
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if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
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goto cleanup;
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/* trigger tracepoint */
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ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
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ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
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ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
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ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
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ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
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ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
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ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
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ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
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ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
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ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
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bss->raw_tp_writable_bare_early_ret = true;
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bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;
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ASSERT_OK(trigger_module_test_writable(&writable_val),
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"trigger_writable");
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ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");
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ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,
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"writable_test_out");
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test_module_attach__detach(skel);
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/* attach fentry/fexit and make sure it get's module reference */
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link = bpf_program__attach(skel->progs.handle_fentry);
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if (!ASSERT_OK_PTR(link, "attach_fentry"))
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goto cleanup;
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ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
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bpf_link__destroy(link);
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link = bpf_program__attach(skel->progs.handle_fexit);
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if (!ASSERT_OK_PTR(link, "attach_fexit"))
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goto cleanup;
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ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
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bpf_link__destroy(link);
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cleanup:
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test_module_attach__destroy(skel);
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}
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