1 // SPDX-License-Identifier: GPL-2.0
2 #include <vmlinux.h>
3 #include <bpf/bpf_tracing.h>
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_core_read.h>
6 
7 struct nf_conn;
8 
9 struct bpf_ct_opts___local {
10 	s32 netns_id;
11 	s32 error;
12 	u8 l4proto;
13 	u8 reserved[3];
14 } __attribute__((preserve_access_index));
15 
16 struct nf_conn *bpf_skb_ct_alloc(struct __sk_buff *, struct bpf_sock_tuple *, u32,
17 				 struct bpf_ct_opts___local *, u32) __ksym;
18 struct nf_conn *bpf_skb_ct_lookup(struct __sk_buff *, struct bpf_sock_tuple *, u32,
19 				  struct bpf_ct_opts___local *, u32) __ksym;
20 struct nf_conn *bpf_ct_insert_entry(struct nf_conn *) __ksym;
21 void bpf_ct_release(struct nf_conn *) __ksym;
22 void bpf_ct_set_timeout(struct nf_conn *, u32) __ksym;
23 int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
24 int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
25 int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
26 
27 SEC("?tc")
28 int alloc_release(struct __sk_buff *ctx)
29 {
30 	struct bpf_ct_opts___local opts = {};
31 	struct bpf_sock_tuple tup = {};
32 	struct nf_conn *ct;
33 
34 	ct = bpf_skb_ct_alloc(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
35 	if (!ct)
36 		return 0;
37 	bpf_ct_release(ct);
38 	return 0;
39 }
40 
41 SEC("?tc")
42 int insert_insert(struct __sk_buff *ctx)
43 {
44 	struct bpf_ct_opts___local opts = {};
45 	struct bpf_sock_tuple tup = {};
46 	struct nf_conn *ct;
47 
48 	ct = bpf_skb_ct_alloc(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
49 	if (!ct)
50 		return 0;
51 	ct = bpf_ct_insert_entry(ct);
52 	if (!ct)
53 		return 0;
54 	ct = bpf_ct_insert_entry(ct);
55 	return 0;
56 }
57 
58 SEC("?tc")
59 int lookup_insert(struct __sk_buff *ctx)
60 {
61 	struct bpf_ct_opts___local opts = {};
62 	struct bpf_sock_tuple tup = {};
63 	struct nf_conn *ct;
64 
65 	ct = bpf_skb_ct_lookup(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
66 	if (!ct)
67 		return 0;
68 	bpf_ct_insert_entry(ct);
69 	return 0;
70 }
71 
72 SEC("?tc")
73 int write_not_allowlisted_field(struct __sk_buff *ctx)
74 {
75 	struct bpf_ct_opts___local opts = {};
76 	struct bpf_sock_tuple tup = {};
77 	struct nf_conn *ct;
78 
79 	ct = bpf_skb_ct_lookup(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
80 	if (!ct)
81 		return 0;
82 	ct->status = 0xF00;
83 	return 0;
84 }
85 
86 SEC("?tc")
87 int set_timeout_after_insert(struct __sk_buff *ctx)
88 {
89 	struct bpf_ct_opts___local opts = {};
90 	struct bpf_sock_tuple tup = {};
91 	struct nf_conn *ct;
92 
93 	ct = bpf_skb_ct_alloc(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
94 	if (!ct)
95 		return 0;
96 	ct = bpf_ct_insert_entry(ct);
97 	if (!ct)
98 		return 0;
99 	bpf_ct_set_timeout(ct, 0);
100 	return 0;
101 }
102 
103 SEC("?tc")
104 int set_status_after_insert(struct __sk_buff *ctx)
105 {
106 	struct bpf_ct_opts___local opts = {};
107 	struct bpf_sock_tuple tup = {};
108 	struct nf_conn *ct;
109 
110 	ct = bpf_skb_ct_alloc(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
111 	if (!ct)
112 		return 0;
113 	ct = bpf_ct_insert_entry(ct);
114 	if (!ct)
115 		return 0;
116 	bpf_ct_set_status(ct, 0);
117 	return 0;
118 }
119 
120 SEC("?tc")
121 int change_timeout_after_alloc(struct __sk_buff *ctx)
122 {
123 	struct bpf_ct_opts___local opts = {};
124 	struct bpf_sock_tuple tup = {};
125 	struct nf_conn *ct;
126 
127 	ct = bpf_skb_ct_alloc(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
128 	if (!ct)
129 		return 0;
130 	bpf_ct_change_timeout(ct, 0);
131 	return 0;
132 }
133 
134 SEC("?tc")
135 int change_status_after_alloc(struct __sk_buff *ctx)
136 {
137 	struct bpf_ct_opts___local opts = {};
138 	struct bpf_sock_tuple tup = {};
139 	struct nf_conn *ct;
140 
141 	ct = bpf_skb_ct_alloc(ctx, &tup, sizeof(tup.ipv4), &opts, sizeof(opts));
142 	if (!ct)
143 		return 0;
144 	bpf_ct_change_status(ct, 0);
145 	return 0;
146 }
147 
148 char _license[] SEC("license") = "GPL";
149