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 int err; 79 80 __builtin_memset(&bpf_tuple, 0, sizeof(bpf_tuple.ipv4)); 81 82 ct = lookup_fn(ctx, NULL, 0, &opts_def, sizeof(opts_def)); 83 if (ct) 84 bpf_ct_release(ct); 85 else 86 test_einval_bpf_tuple = opts_def.error; 87 88 opts_def.reserved[0] = 1; 89 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 90 sizeof(opts_def)); 91 opts_def.reserved[0] = 0; 92 opts_def.l4proto = IPPROTO_TCP; 93 if (ct) 94 bpf_ct_release(ct); 95 else 96 test_einval_reserved = opts_def.error; 97 98 opts_def.netns_id = -2; 99 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 100 sizeof(opts_def)); 101 opts_def.netns_id = -1; 102 if (ct) 103 bpf_ct_release(ct); 104 else 105 test_einval_netns_id = opts_def.error; 106 107 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 108 sizeof(opts_def) - 1); 109 if (ct) 110 bpf_ct_release(ct); 111 else 112 test_einval_len_opts = opts_def.error; 113 114 opts_def.l4proto = IPPROTO_ICMP; 115 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 116 sizeof(opts_def)); 117 opts_def.l4proto = IPPROTO_TCP; 118 if (ct) 119 bpf_ct_release(ct); 120 else 121 test_eproto_l4proto = opts_def.error; 122 123 opts_def.netns_id = 0xf00f; 124 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 125 sizeof(opts_def)); 126 opts_def.netns_id = -1; 127 if (ct) 128 bpf_ct_release(ct); 129 else 130 test_enonet_netns_id = opts_def.error; 131 132 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 133 sizeof(opts_def)); 134 if (ct) 135 bpf_ct_release(ct); 136 else 137 test_enoent_lookup = opts_def.error; 138 139 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4) - 1, &opts_def, 140 sizeof(opts_def)); 141 if (ct) 142 bpf_ct_release(ct); 143 else 144 test_eafnosupport = opts_def.error; 145 146 bpf_tuple.ipv4.saddr = bpf_get_prandom_u32(); /* src IP */ 147 bpf_tuple.ipv4.daddr = bpf_get_prandom_u32(); /* dst IP */ 148 bpf_tuple.ipv4.sport = bpf_get_prandom_u32(); /* src port */ 149 bpf_tuple.ipv4.dport = bpf_get_prandom_u32(); /* dst port */ 150 151 ct = alloc_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 152 sizeof(opts_def)); 153 if (ct) { 154 __u16 sport = bpf_get_prandom_u32(); 155 __u16 dport = bpf_get_prandom_u32(); 156 union nf_inet_addr saddr = {}; 157 union nf_inet_addr daddr = {}; 158 struct nf_conn *ct_ins; 159 160 bpf_ct_set_timeout(ct, 10000); 161 ct->mark = 77; 162 163 /* snat */ 164 saddr.ip = bpf_get_prandom_u32(); 165 bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local); 166 /* dnat */ 167 daddr.ip = bpf_get_prandom_u32(); 168 bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local); 169 170 ct_ins = bpf_ct_insert_entry(ct); 171 if (ct_ins) { 172 struct nf_conn *ct_lk; 173 174 ct_lk = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), 175 &opts_def, sizeof(opts_def)); 176 if (ct_lk) { 177 struct nf_conntrack_tuple *tuple; 178 179 /* check snat and dnat addresses */ 180 tuple = &ct_lk->tuplehash[IP_CT_DIR_REPLY].tuple; 181 if (tuple->dst.u3.ip == saddr.ip && 182 tuple->dst.u.all == bpf_htons(sport)) 183 test_snat_addr = 0; 184 if (tuple->src.u3.ip == daddr.ip && 185 tuple->src.u.all == bpf_htons(dport)) 186 test_dnat_addr = 0; 187 188 /* update ct entry timeout */ 189 bpf_ct_change_timeout(ct_lk, 10000); 190 test_delta_timeout = ct_lk->timeout - bpf_jiffies64(); 191 test_delta_timeout /= CONFIG_HZ; 192 test_insert_lookup_mark = ct_lk->mark; 193 bpf_ct_change_status(ct_lk, 194 IPS_CONFIRMED | IPS_SEEN_REPLY); 195 test_status = ct_lk->status; 196 197 bpf_ct_release(ct_lk); 198 test_succ_lookup = 0; 199 } 200 bpf_ct_release(ct_ins); 201 test_insert_entry = 0; 202 } 203 test_alloc_entry = 0; 204 } 205 206 bpf_tuple.ipv4.saddr = saddr; 207 bpf_tuple.ipv4.daddr = daddr; 208 bpf_tuple.ipv4.sport = sport; 209 bpf_tuple.ipv4.dport = dport; 210 ct = lookup_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def, 211 sizeof(opts_def)); 212 if (ct) { 213 test_exist_lookup = 0; 214 if (ct->mark == 42) { 215 ct->mark++; 216 test_exist_lookup_mark = ct->mark; 217 } 218 bpf_ct_release(ct); 219 } else { 220 test_exist_lookup = opts_def.error; 221 } 222 } 223 224 SEC("xdp") 225 int nf_xdp_ct_test(struct xdp_md *ctx) 226 { 227 nf_ct_test((void *)bpf_xdp_ct_lookup, (void *)bpf_xdp_ct_alloc, ctx); 228 return 0; 229 } 230 231 SEC("tc") 232 int nf_skb_ct_test(struct __sk_buff *ctx) 233 { 234 nf_ct_test((void *)bpf_skb_ct_lookup, (void *)bpf_skb_ct_alloc, ctx); 235 return 0; 236 } 237 238 char _license[] SEC("license") = "GPL"; 239