113 lines
2.7 KiB
C
113 lines
2.7 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 "test_module_attach.skel.h"
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static int duration;
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static int trigger_module_test_read(int read_sz)
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{
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int fd, err;
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fd = open("/sys/kernel/bpf_testmod", O_RDONLY);
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err = -errno;
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if (CHECK(fd < 0, "testmod_file_open", "failed: %d\n", err))
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return err;
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read(fd, NULL, read_sz);
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close(fd);
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return 0;
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}
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static int trigger_module_test_write(int write_sz)
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{
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int fd, err;
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char *buf = malloc(write_sz);
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if (!buf)
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return -ENOMEM;
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memset(buf, 'a', write_sz);
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buf[write_sz-1] = '\0';
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fd = open("/sys/kernel/bpf_testmod", O_WRONLY);
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err = -errno;
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if (CHECK(fd < 0, "testmod_file_open", "failed: %d\n", err)) {
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free(buf);
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return err;
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}
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write(fd, buf, write_sz);
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close(fd);
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free(buf);
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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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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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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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