118 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2020 Facebook */3 4#include <test_progs.h>5#include <stdbool.h>6#include "test_module_attach.skel.h"7#include "testing_helpers.h"8 9static int duration;10 11static int trigger_module_test_writable(int *val)12{13 int fd, err;14 char buf[65];15 ssize_t rd;16 17 fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);18 err = -errno;19 if (!ASSERT_GE(fd, 0, "testmode_file_open"))20 return err;21 22 rd = read(fd, buf, sizeof(buf) - 1);23 err = -errno;24 if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {25 close(fd);26 return err;27 }28 29 buf[rd] = '\0';30 *val = strtol(buf, NULL, 0);31 close(fd);32 33 return 0;34}35 36void test_module_attach(void)37{38 const int READ_SZ = 456;39 const int WRITE_SZ = 457;40 struct test_module_attach* skel;41 struct test_module_attach__bss *bss;42 struct bpf_link *link;43 int err;44 int writable_val = 0;45 46 skel = test_module_attach__open();47 if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))48 return;49 50 err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,51 0, "bpf_testmod_test_read");52 ASSERT_OK(err, "set_attach_target");53 54 err = bpf_program__set_attach_target(skel->progs.handle_fentry_explicit_manual,55 0, "bpf_testmod:bpf_testmod_test_read");56 ASSERT_OK(err, "set_attach_target_explicit");57 58 err = test_module_attach__load(skel);59 if (CHECK(err, "skel_load", "failed to load skeleton\n"))60 return;61 62 bss = skel->bss;63 64 err = test_module_attach__attach(skel);65 if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))66 goto cleanup;67 68 /* trigger tracepoint */69 ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");70 ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");71 72 ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");73 ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");74 ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");75 ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");76 ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");77 ASSERT_EQ(bss->fentry_explicit_read_sz, READ_SZ, "fentry_explicit");78 ASSERT_EQ(bss->fentry_explicit_manual_read_sz, READ_SZ, "fentry_explicit_manual");79 ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");80 ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");81 ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");82 83 bss->raw_tp_writable_bare_early_ret = true;84 bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;85 ASSERT_OK(trigger_module_test_writable(&writable_val),86 "trigger_writable");87 ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");88 ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,89 "writable_test_out");90 91 test_module_attach__detach(skel);92 93 /* attach fentry/fexit and make sure it get's module reference */94 link = bpf_program__attach(skel->progs.handle_fentry);95 if (!ASSERT_OK_PTR(link, "attach_fentry"))96 goto cleanup;97 98 ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");99 bpf_link__destroy(link);100 101 link = bpf_program__attach(skel->progs.handle_fexit);102 if (!ASSERT_OK_PTR(link, "attach_fexit"))103 goto cleanup;104 105 ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");106 bpf_link__destroy(link);107 108 link = bpf_program__attach(skel->progs.kprobe_multi);109 if (!ASSERT_OK_PTR(link, "attach_kprobe_multi"))110 goto cleanup;111 112 ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");113 bpf_link__destroy(link);114 115cleanup:116 test_module_attach__destroy(skel);117}118