tools/testing/selftests/bpf/progs/test_bpf_nf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <vmlinux.h>
   3 #include <bpf/bpf_helpers.h>
   4
   5 #define EAFNOSUPPORT 97
   6 #define EPROTO 71
   7 #define ENONET 64
   8 #define EINVAL 22
   9 #define ENOENT 2
  10
  11 int test_einval_bpf_tuple = 0;
  12 int test_einval_reserved = 0;
  13 int test_einval_netns_id = 0;
  14 int test_einval_len_opts = 0;
  15 int test_eproto_l4proto = 0;
  16 int test_enonet_netns_id = 0;
  17 int test_enoent_lookup = 0;
  18 int test_eafnosupport = 0;
  19
  20 struct nf_conn;
  21
  22 struct bpf_ct_opts___local {
  23         s32 netns_id;
  24         s32 error;
  25         u8 l4proto;
  26         u8 reserved[3];
  27 } __attribute__((preserve_access_index));
  28
  29 struct nf_conn *bpf_xdp_ct_lookup(struct xdp_md *, struct bpf_sock_tuple *, u32,
  30                                   struct bpf_ct_opts___local *, u32) __ksym;
  31 struct nf_conn *bpf_skb_ct_lookup(struct __sk_buff *, struct bpf_sock_tuple *, u32,
  32                                   struct bpf_ct_opts___local *, u32) __ksym;
  33 void bpf_ct_release(struct nf_conn *) __ksym;
  34
  35 static __always_inline void
  36 nf_ct_test(struct nf_conn *(*func)(void *, struct bpf_sock_tuple *, u32,
  37                                    struct bpf_ct_opts___local *, u32),
  38            void *ctx)
  39 {
  40         struct bpf_ct_opts___local opts_def = { .l4proto = IPPROTO_TCP, .netns_id = -1 };
  41         struct bpf_sock_tuple bpf_tuple;
  42         struct nf_conn *ct;
  43
  44         __builtin_memset(&bpf_tuple, 0, sizeof(bpf_tuple.ipv4));
  45
  46         ct = func(ctx, NULL, 0, &opts_def, sizeof(opts_def));
  47         if (ct)
  48                 bpf_ct_release(ct);
  49         else
  50                 test_einval_bpf_tuple = opts_def.error;
  51
  52         opts_def.reserved[0] = 1;
  53         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def));
  54         opts_def.reserved[0] = 0;
  55         opts_def.l4proto = IPPROTO_TCP;
  56         if (ct)
  57                 bpf_ct_release(ct);
  58         else
  59                 test_einval_reserved = opts_def.error;
  60
  61         opts_def.netns_id = -2;
  62         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def));
  63         opts_def.netns_id = -1;
  64         if (ct)
  65                 bpf_ct_release(ct);
  66         else
  67                 test_einval_netns_id = opts_def.error;
  68
  69         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def) - 1);
  70         if (ct)
  71                 bpf_ct_release(ct);
  72         else
  73                 test_einval_len_opts = opts_def.error;
  74
  75         opts_def.l4proto = IPPROTO_ICMP;
  76         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def));
  77         opts_def.l4proto = IPPROTO_TCP;
  78         if (ct)
  79                 bpf_ct_release(ct);
  80         else
  81                 test_eproto_l4proto = opts_def.error;
  82
  83         opts_def.netns_id = 0xf00f;
  84         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def));
  85         opts_def.netns_id = -1;
  86         if (ct)
  87                 bpf_ct_release(ct);
  88         else
  89                 test_enonet_netns_id = opts_def.error;
  90
  91         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, sizeof(opts_def));
  92         if (ct)
  93                 bpf_ct_release(ct);
  94         else
  95                 test_enoent_lookup = opts_def.error;
  96
  97         ct = func(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4) - 1, &opts_def, sizeof(opts_def));
  98         if (ct)
  99                 bpf_ct_release(ct);
 100         else
 101                 test_eafnosupport = opts_def.error;
 102 }
 103
 104 SEC("xdp")
 105 int nf_xdp_ct_test(struct xdp_md *ctx)
 106 {
 107         nf_ct_test((void *)bpf_xdp_ct_lookup, ctx);
 108         return 0;
 109 }
 110
 111 SEC("tc")
 112 int nf_skb_ct_test(struct __sk_buff *ctx)
 113 {
 114         nf_ct_test((void *)bpf_skb_ct_lookup, ctx);
 115         return 0;
 116 }
 117
 118 char _license[] SEC("license") = "GPL";