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 #include <bpf/bpf_endian.h>
   5
   6 #define EAFNOSUPPORT 97
   7 #define EPROTO 71
   8 #define ENONET 64
   9 #define EINVAL 22
  10 #define ENOENT 2
  11
  12 extern unsigned long CONFIG_HZ __kconfig;
  13
  14 int test_einval_bpf_tuple = 0;
  15 int test_einval_reserved = 0;
  16 int test_einval_netns_id = 0;
  17 int test_einval_len_opts = 0;
  18 int test_eproto_l4proto = 0;
  19 int test_enonet_netns_id = 0;
  20 int test_enoent_lookup = 0;
  21 int test_eafnosupport = 0;
  22 int test_alloc_entry = -EINVAL;
  23 int test_insert_entry = -EAFNOSUPPORT;
  24 int test_succ_lookup = -ENOENT;
  25 u32 test_delta_timeout = 0;
  26 u32 test_status = 0;
  27 u32 test_insert_lookup_mark = 0;
  28 int test_snat_addr = -EINVAL;
  29 int test_dnat_addr = -EINVAL;
  30 __be32 saddr = 0;
  31 __be16 sport = 0;
  32 __be32 daddr = 0;
  33 __be16 dport = 0;
  34 int test_exist_lookup = -ENOENT;
  35 u32 test_exist_lookup_mark = 0;
  36
  37 enum nf_nat_manip_type___local {
  38         NF_NAT_MANIP_SRC___local,
  39         NF_NAT_MANIP_DST___local
  40 };
  41
  42 struct nf_conn;
  43
  44 struct bpf_ct_opts___local {
  45         s32 netns_id;
  46         s32 error;
  47         u8 l4proto;
  48         u8 reserved[3];
  49 } __attribute__((preserve_access_index));
  50
  51 struct nf_conn *bpf_xdp_ct_alloc(struct xdp_md *, struct bpf_sock_tuple *, u32,
  52                                  struct bpf_ct_opts___local *, u32) __ksym;
  53 struct nf_conn *bpf_xdp_ct_lookup(struct xdp_md *, struct bpf_sock_tuple *, u32,
  54                                   struct bpf_ct_opts___local *, u32) __ksym;
  55 struct nf_conn *bpf_skb_ct_alloc(struct __sk_buff *, struct bpf_sock_tuple *, u32,
  56                                  struct bpf_ct_opts___local *, u32) __ksym;
  57 struct nf_conn *bpf_skb_ct_lookup(struct __sk_buff *, struct bpf_sock_tuple *, u32,
  58                                   struct bpf_ct_opts___local *, u32) __ksym;
  59 struct nf_conn *bpf_ct_insert_entry(struct nf_conn *) __ksym;
  60 void bpf_ct_release(struct nf_conn *) __ksym;
  61 void bpf_ct_set_timeout(struct nf_conn *, u32) __ksym;
  62 int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
  63 int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
  64 int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
  65 int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
  66                         int port, enum nf_nat_manip_type___local) __ksym;
  67
  68 static __always_inline void
  69 nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
  70                                         struct bpf_ct_opts___local *, u32),
  71            struct nf_conn *(*alloc_fn)(void *, struct bpf_sock_tuple *, u32,
  72                                        struct bpf_ct_opts___local *, u32),
  73            void *ctx)
  74 {
  75         struct bpf_ct_opts___local opts_def = { .l4proto = IPPROTO_TCP, .netns_id = -1 };
  76         struct bpf_sock_tuple bpf_tuple;
  77         struct nf_conn *ct;
  78
  79         __builtin_memset(&bpf_tuple, 0, sizeof(bpf_tuple.ipv4));
  80
  81         ct = lookup_fn(ctx, NULL, 0, &opts_def, sizeof(opts_def));
  82         if (ct)
  83                 bpf_ct_release(ct);
  84         else
  85                 test_einval_bpf_tuple = opts_def.error;
  86
  87         opts_def.reserved[0] = 1;
  88         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
  89                        sizeof(opts_def));
  90         opts_def.reserved[0] = 0;
  91         opts_def.l4proto = IPPROTO_TCP;
  92         if (ct)
  93                 bpf_ct_release(ct);
  94         else
  95                 test_einval_reserved = opts_def.error;
  96
  97         opts_def.netns_id = -2;
  98         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
  99                        sizeof(opts_def));
 100         opts_def.netns_id = -1;
 101         if (ct)
 102                 bpf_ct_release(ct);
 103         else
 104                 test_einval_netns_id = opts_def.error;
 105
 106         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 107                        sizeof(opts_def) - 1);
 108         if (ct)
 109                 bpf_ct_release(ct);
 110         else
 111                 test_einval_len_opts = opts_def.error;
 112
 113         opts_def.l4proto = IPPROTO_ICMP;
 114         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 115                        sizeof(opts_def));
 116         opts_def.l4proto = IPPROTO_TCP;
 117         if (ct)
 118                 bpf_ct_release(ct);
 119         else
 120                 test_eproto_l4proto = opts_def.error;
 121
 122         opts_def.netns_id = 0xf00f;
 123         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 124                        sizeof(opts_def));
 125         opts_def.netns_id = -1;
 126         if (ct)
 127                 bpf_ct_release(ct);
 128         else
 129                 test_enonet_netns_id = opts_def.error;
 130
 131         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 132                        sizeof(opts_def));
 133         if (ct)
 134                 bpf_ct_release(ct);
 135         else
 136                 test_enoent_lookup = opts_def.error;
 137
 138         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4) - 1, &opts_def,
 139                        sizeof(opts_def));
 140         if (ct)
 141                 bpf_ct_release(ct);
 142         else
 143                 test_eafnosupport = opts_def.error;
 144
 145         bpf_tuple.ipv4.saddr = bpf_get_prandom_u32(); /* src IP */
 146         bpf_tuple.ipv4.daddr = bpf_get_prandom_u32(); /* dst IP */
 147         bpf_tuple.ipv4.sport = bpf_get_prandom_u32(); /* src port */
 148         bpf_tuple.ipv4.dport = bpf_get_prandom_u32(); /* dst port */
 149
 150         ct = alloc_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 151                       sizeof(opts_def));
 152         if (ct) {
 153                 __u16 sport = bpf_get_prandom_u32();
 154                 __u16 dport = bpf_get_prandom_u32();
 155                 union nf_inet_addr saddr = {};
 156                 union nf_inet_addr daddr = {};
 157                 struct nf_conn *ct_ins;
 158
 159                 bpf_ct_set_timeout(ct, 10000);
 160                 ct->mark = 77;
 161
 162                 /* snat */
 163                 saddr.ip = bpf_get_prandom_u32();
 164                 bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
 165                 /* dnat */
 166                 daddr.ip = bpf_get_prandom_u32();
 167                 bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
 168
 169                 ct_ins = bpf_ct_insert_entry(ct);
 170                 if (ct_ins) {
 171                         struct nf_conn *ct_lk;
 172
 173                         ct_lk = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4),
 174                                           &opts_def, sizeof(opts_def));
 175                         if (ct_lk) {
 176                                 struct nf_conntrack_tuple *tuple;
 177
 178                                 /* check snat and dnat addresses */
 179                                 tuple = &ct_lk->tuplehash[IP_CT_DIR_REPLY].tuple;
 180                                 if (tuple->dst.u3.ip == saddr.ip &&
 181                                     tuple->dst.u.all == bpf_htons(sport))
 182                                         test_snat_addr = 0;
 183                                 if (tuple->src.u3.ip == daddr.ip &&
 184                                     tuple->src.u.all == bpf_htons(dport))
 185                                         test_dnat_addr = 0;
 186
 187                                 /* update ct entry timeout */
 188                                 bpf_ct_change_timeout(ct_lk, 10000);
 189                                 test_delta_timeout = ct_lk->timeout - bpf_jiffies64();
 190                                 test_delta_timeout /= CONFIG_HZ;
 191                                 test_insert_lookup_mark = ct_lk->mark;
 192                                 bpf_ct_change_status(ct_lk,
 193                                                      IPS_CONFIRMED | IPS_SEEN_REPLY);
 194                                 test_status = ct_lk->status;
 195
 196                                 bpf_ct_release(ct_lk);
 197                                 test_succ_lookup = 0;
 198                         }
 199                         bpf_ct_release(ct_ins);
 200                         test_insert_entry = 0;
 201                 }
 202                 test_alloc_entry = 0;
 203         }
 204
 205         bpf_tuple.ipv4.saddr = saddr;
 206         bpf_tuple.ipv4.daddr = daddr;
 207         bpf_tuple.ipv4.sport = sport;
 208         bpf_tuple.ipv4.dport = dport;
 209         ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 210                        sizeof(opts_def));
 211         if (ct) {
 212                 test_exist_lookup = 0;
 213                 if (ct->mark == 42) {
 214                         ct->mark++;
 215                         test_exist_lookup_mark = ct->mark;
 216                 }
 217                 bpf_ct_release(ct);
 218         } else {
 219                 test_exist_lookup = opts_def.error;
 220         }
 221 }
 222
 223 SEC("xdp")
 224 int nf_xdp_ct_test(struct xdp_md *ctx)
 225 {
 226         nf_ct_test((void *)bpf_xdp_ct_lookup, (void *)bpf_xdp_ct_alloc, ctx);
 227         return 0;
 228 }
 229
 230 SEC("tc")
 231 int nf_skb_ct_test(struct __sk_buff *ctx)
 232 {
 233         nf_ct_test((void *)bpf_skb_ct_lookup, (void *)bpf_skb_ct_alloc, ctx);
 234         return 0;
 235 }
 236
 237 char _license[] SEC("license") = "GPL";