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
nf_ct_test(struct nf_conn * (* lookup_fn)(void *,struct bpf_sock_tuple *,u32,struct bpf_ct_opts___local *,u32),struct nf_conn * (* alloc_fn)(void *,struct bpf_sock_tuple *,u32,struct bpf_ct_opts___local *,u32),void * ctx)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")
nf_xdp_ct_test(struct xdp_md * ctx)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")
nf_skb_ct_test(struct __sk_buff * ctx)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