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