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
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")
nf_xdp_ct_test(struct xdp_md * ctx)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")
nf_skb_ct_test(struct __sk_buff * ctx)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";
238