libnftnl  1.2.9
nft-expr_cmp-test.c
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * (C) 2013 by Ana Rey Botello <anarey@gmail.com>
4  */
5 
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <string.h>
9 
10 #include <netinet/in.h>
11 #include <netinet/ip.h>
12 #include <linux/netfilter/nf_tables.h>
13 #include <libmnl/libmnl.h>
14 #include <libnftnl/rule.h>
15 #include <libnftnl/expr.h>
16 
17 static int test_ok = 1;
18 
19 static void print_err(const char *msg)
20 {
21  test_ok = 0;
22  printf("\033[31mERROR:\e[0m %s\n", msg);
23 }
24 
25 static void cmp_nftnl_expr(struct nftnl_expr *rule_a,
26  struct nftnl_expr *rule_b)
27 {
28  uint32_t data_lena, data_lenb;
29 
30  nftnl_expr_get(rule_a, NFTNL_EXPR_CMP_DATA, &data_lena);
31  nftnl_expr_get(rule_b, NFTNL_EXPR_CMP_DATA, &data_lenb);
32  if (data_lena != data_lenb)
33  print_err("Size of NFTNL_EXPR_CMP_DATA mismatches");
34  if (nftnl_expr_get_u32(rule_a, NFTNL_EXPR_CMP_SREG) !=
35  nftnl_expr_get_u32(rule_b, NFTNL_EXPR_CMP_SREG))
36  print_err("Expr NFTNL_EXPR_CMP_SREG mismatches");
37  if (nftnl_expr_get_u32(rule_a, NFTNL_EXPR_CMP_OP) !=
38  nftnl_expr_get_u32(rule_b, NFTNL_EXPR_CMP_OP))
39  print_err("Expr NFTNL_EXPR_CMP_OP mismatches");
40 }
41 
42 int main(int argc, char *argv[])
43 {
44  struct nftnl_rule *a, *b;
45  struct nftnl_expr *ex;
46  struct nlmsghdr *nlh;
47  char buf[4096];
48  struct nftnl_expr_iter *iter_a, *iter_b;
49  struct nftnl_expr *rule_a, *rule_b;
50  uint32_t data_len = 0x01010101;
51 
52  a = nftnl_rule_alloc();
53  b = nftnl_rule_alloc();
54  if (a == NULL || b == NULL)
55  print_err("OOM");
56  ex = nftnl_expr_alloc("cmp");
57  if (ex == NULL)
58  print_err("OOM");
59 
60  nftnl_expr_set(ex, NFTNL_EXPR_CMP_DATA, &data_len, sizeof(data_len));
61  nftnl_expr_set_u32(ex, NFTNL_EXPR_CMP_SREG, 0x12345678);
62  nftnl_expr_set_u32(ex, NFTNL_EXPR_CMP_OP, 0x78123456);
63 
64  nftnl_rule_add_expr(a, ex);
65 
66  nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_NEWRULE, AF_INET, 0, 1234);
67  nftnl_rule_nlmsg_build_payload(nlh, a);
68 
69  if (nftnl_rule_nlmsg_parse(nlh, b) < 0)
70  print_err("parsing problems");
71 
72  iter_a = nftnl_expr_iter_create(a);
73  iter_b = nftnl_expr_iter_create(b);
74  if (iter_a == NULL || iter_b == NULL)
75  print_err("OOM");
76  rule_a = nftnl_expr_iter_next(iter_a);
77  rule_b = nftnl_expr_iter_next(iter_b);
78  if (rule_a == NULL || rule_b == NULL)
79  print_err("OOM");
80 
81  cmp_nftnl_expr(rule_a, rule_b);
82 
83  if (nftnl_expr_iter_next(iter_a) != NULL ||
84  nftnl_expr_iter_next(iter_b) != NULL)
85  print_err("More 1 expr.");
86 
87  nftnl_expr_iter_destroy(iter_a);
88  nftnl_expr_iter_destroy(iter_b);
89  nftnl_rule_free(a);
90  nftnl_rule_free(b);
91 
92  if (!test_ok)
93  exit(EXIT_FAILURE);
94 
95  printf("%s: \033[32mOK\e[0m\n", argv[0]);
96  return EXIT_SUCCESS;
97 }