Quelle  dynptr.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Facebook */

#include <test_progs.h>
#include <network_helpers.h>
#include "dynptr_fail.skel.h"
#include "dynptr_success.skel.h"

enum test_setup_type {
 SETUP_SYSCALL_SLEEP,
 SETUP_SKB_PROG,
 SETUP_SKB_PROG_TP,
 SETUP_XDP_PROG,
};

static struct {
 const char *prog_name;
 enum test_setup_type type;
} success_tests[] = {
 {"test_read_write", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_data", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_copy", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_copy_xdp", SETUP_XDP_PROG},
 {"test_dynptr_memset_zero", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_memset_notzero", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_memset_zero_offset", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_memset_zero_adjusted", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_memset_overflow", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_memset_overflow_offset", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_memset_readonly", SETUP_SKB_PROG},
 {"test_dynptr_memset_xdp_chunks", SETUP_XDP_PROG},
 {"test_ringbuf", SETUP_SYSCALL_SLEEP},
 {"test_skb_readonly", SETUP_SKB_PROG},
 {"test_dynptr_skb_data", SETUP_SKB_PROG},
 {"test_adjust", SETUP_SYSCALL_SLEEP},
 {"test_adjust_err", SETUP_SYSCALL_SLEEP},
 {"test_zero_size_dynptr", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_is_null", SETUP_SYSCALL_SLEEP},
 {"test_dynptr_is_rdonly", SETUP_SKB_PROG},
 {"test_dynptr_clone", SETUP_SKB_PROG},
 {"test_dynptr_skb_no_buff", SETUP_SKB_PROG},
 {"test_dynptr_skb_strcmp", SETUP_SKB_PROG},
 {"test_dynptr_skb_tp_btf", SETUP_SKB_PROG_TP},
 {"test_probe_read_user_dynptr", SETUP_XDP_PROG},
 {"test_probe_read_kernel_dynptr", SETUP_XDP_PROG},
 {"test_probe_read_user_str_dynptr", SETUP_XDP_PROG},
 {"test_probe_read_kernel_str_dynptr", SETUP_XDP_PROG},
 {"test_copy_from_user_dynptr", SETUP_SYSCALL_SLEEP},
 {"test_copy_from_user_str_dynptr", SETUP_SYSCALL_SLEEP},
 {"test_copy_from_user_task_dynptr", SETUP_SYSCALL_SLEEP},
 {"test_copy_from_user_task_str_dynptr", SETUP_SYSCALL_SLEEP},
};

#define PAGE_SIZE_64K 65536

static void verify_success(const char *prog_name, enum test_setup_type setup_type)
{
 char user_data[384] = {[0 ... 382] = 'a', '\0'};
 struct dynptr_success *skel;
 struct bpf_program *prog;
 struct bpf_link *link;
 int err;

 skel = dynptr_success__open();
 if (!ASSERT_OK_PTR(skel, "dynptr_success__open"))
  return;

 skel->bss->pid = getpid();

 prog = bpf_object__find_program_by_name(skel->obj, prog_name);
 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
  goto cleanup;

 bpf_program__set_autoload(prog, true);

 err = dynptr_success__load(skel);
 if (!ASSERT_OK(err, "dynptr_success__load"))
  goto cleanup;

 skel->bss->user_ptr = user_data;
 skel->data->test_len[0] = sizeof(user_data);
 memcpy(skel->bss->expected_str, user_data, sizeof(user_data));

 switch (setup_type) {
 case SETUP_SYSCALL_SLEEP:
  link = bpf_program__attach(prog);
  if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
   goto cleanup;

  usleep(1);

  bpf_link__destroy(link);
  break;
 case SETUP_SKB_PROG:
 {
  int prog_fd;
  char buf[64];

  LIBBPF_OPTS(bpf_test_run_opts, topts,
       .data_in = &pkt_v4,
       .data_size_in = sizeof(pkt_v4),
       .data_out = buf,
       .data_size_out = sizeof(buf),
       .repeat = 1,
  );

  prog_fd = bpf_program__fd(prog);
  if (!ASSERT_GE(prog_fd, 0, "prog_fd"))
   goto cleanup;

  err = bpf_prog_test_run_opts(prog_fd, &topts);

  if (!ASSERT_OK(err, "test_run"))
   goto cleanup;

  break;
 }
 case SETUP_SKB_PROG_TP:
 {
  struct __sk_buff skb = {};
  struct bpf_object *obj;
  int aux_prog_fd;

  /* Just use its test_run to trigger kfree_skb tracepoint */
  err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
      &obj, &aux_prog_fd);
  if (!ASSERT_OK(err, "prog_load sched cls"))
   goto cleanup;

  LIBBPF_OPTS(bpf_test_run_opts, topts,
       .data_in = &pkt_v4,
       .data_size_in = sizeof(pkt_v4),
       .ctx_in = &skb,
       .ctx_size_in = sizeof(skb),
  );

  link = bpf_program__attach(prog);
  if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
   goto cleanup;

  err = bpf_prog_test_run_opts(aux_prog_fd, &topts);
  bpf_link__destroy(link);

  if (!ASSERT_OK(err, "test_run"))
   goto cleanup;

  break;
 }
 case SETUP_XDP_PROG:
 {
  char data[90000];
  int err, prog_fd;
  LIBBPF_OPTS(bpf_test_run_opts, opts,
       .data_in = &data,
       .repeat = 1,
  );

  if (getpagesize() == PAGE_SIZE_64K)
   opts.data_size_in = sizeof(data);
  else
   opts.data_size_in = 5000;

  prog_fd = bpf_program__fd(prog);
  err = bpf_prog_test_run_opts(prog_fd, &opts);

  if (!ASSERT_OK(err, "test_run"))
   goto cleanup;

  break;
 }
 }

 ASSERT_EQ(skel->bss->err, 0, "err");

cleanup:
 dynptr_success__destroy(skel);
}

void test_dynptr(void)
{
 int i;

 for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
  if (!test__start_subtest(success_tests[i].prog_name))
   continue;

  verify_success(success_tests[i].prog_name, success_tests[i].type);
 }

 RUN_TESTS(dynptr_fail);
}