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 12extern unsigned long CONFIG_HZ __kconfig; 13 14int test_einval_bpf_tuple = 0; 15int test_einval_reserved = 0; 16int test_einval_netns_id = 0; 17int test_einval_len_opts = 0; 18int test_eproto_l4proto = 0; 19int test_enonet_netns_id = 0; 20int test_enoent_lookup = 0; 21int test_eafnosupport = 0; 22int test_alloc_entry = -EINVAL; 23int test_insert_entry = -EAFNOSUPPORT; 24int test_succ_lookup = -ENOENT; 25u32 test_delta_timeout = 0; 26u32 test_status = 0; 27u32 test_insert_lookup_mark = 0; 28int test_snat_addr = -EINVAL; 29int test_dnat_addr = -EINVAL; 30__be32 saddr = 0; 31__be16 sport = 0; 32__be32 daddr = 0; 33__be16 dport = 0; 34int test_exist_lookup = -ENOENT; 35u32 test_exist_lookup_mark = 0; 36 37enum nf_nat_manip_type___local { 38 NF_NAT_MANIP_SRC___local, 39 NF_NAT_MANIP_DST___local 40}; 41 42struct nf_conn; 43 44struct bpf_ct_opts___local { 45 s32 netns_id; 46 s32 error; 47 u8 l4proto; 48 u8 reserved[3]; 49} __attribute__((preserve_access_index)); 50 51struct nf_conn *bpf_xdp_ct_alloc(struct xdp_md *, struct bpf_sock_tuple *, u32, 52 struct bpf_ct_opts___local *, u32) __ksym; 53struct nf_conn *bpf_xdp_ct_lookup(struct xdp_md *, struct bpf_sock_tuple *, u32, 54 struct bpf_ct_opts___local *, u32) __ksym; 55struct nf_conn *bpf_skb_ct_alloc(struct __sk_buff *, struct bpf_sock_tuple *, u32, 56 struct bpf_ct_opts___local *, u32) __ksym; 57struct nf_conn *bpf_skb_ct_lookup(struct __sk_buff *, struct bpf_sock_tuple *, u32, 58 struct bpf_ct_opts___local *, u32) __ksym; 59struct nf_conn *bpf_ct_insert_entry(struct nf_conn *) __ksym; 60void bpf_ct_release(struct nf_conn *) __ksym; 61void bpf_ct_set_timeout(struct nf_conn *, u32) __ksym; 62int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym; 63int bpf_ct_set_status(struct nf_conn *, u32) __ksym; 64int bpf_ct_change_status(struct nf_conn *, u32) __ksym; 65int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *, 66 int port, enum nf_nat_manip_type___local) __ksym; 67 68static __always_inline void 69nf_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 223SEC("xdp") 224int 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 230SEC("tc") 231int 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 237char _license[] SEC("license") = "GPL"; 238