1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2020 Facebook */
3
4 #ifndef _TEST_TCP_HDR_OPTIONS_H
5 #define _TEST_TCP_HDR_OPTIONS_H
6
7 struct bpf_test_option {
8 __u8 flags;
9 __u8 max_delack_ms;
10 __u8 rand;
11 } __attribute__((packed));
12
13 enum {
14 OPTION_RESEND,
15 OPTION_MAX_DELACK_MS,
16 OPTION_RAND,
17 __NR_OPTION_FLAGS,
18 };
19
20 #define OPTION_F_RESEND (1 << OPTION_RESEND)
21 #define OPTION_F_MAX_DELACK_MS (1 << OPTION_MAX_DELACK_MS)
22 #define OPTION_F_RAND (1 << OPTION_RAND)
23 #define OPTION_MASK ((1 << __NR_OPTION_FLAGS) - 1)
24
25 #define TEST_OPTION_FLAGS(flags, option) (1 & ((flags) >> (option)))
26 #define SET_OPTION_FLAGS(flags, option) ((flags) |= (1 << (option)))
27
28 /* Store in bpf_sk_storage */
29 struct hdr_stg {
30 bool active;
31 bool resend_syn; /* active side only */
32 bool syncookie; /* passive side only */
33 bool fastopen; /* passive side only */
34 };
35
36 struct linum_err {
37 unsigned int linum;
38 int err;
39 };
40
41 #define TCPHDR_FIN 0x01
42 #define TCPHDR_SYN 0x02
43 #define TCPHDR_RST 0x04
44 #define TCPHDR_PSH 0x08
45 #define TCPHDR_ACK 0x10
46 #define TCPHDR_URG 0x20
47 #define TCPHDR_ECE 0x40
48 #define TCPHDR_CWR 0x80
49 #define TCPHDR_SYNACK (TCPHDR_SYN | TCPHDR_ACK)
50
51 #define TCPOPT_EOL 0
52 #define TCPOPT_NOP 1
53 #define TCPOPT_MSS 2
54 #define TCPOPT_WINDOW 3
55 #define TCPOPT_EXP 254
56
57 #define TCP_BPF_EXPOPT_BASE_LEN 4
58 #define MAX_TCP_HDR_LEN 60
59 #define MAX_TCP_OPTION_SPACE 40
60
61 #ifdef BPF_PROG_TEST_TCP_HDR_OPTIONS
62
63 #define CG_OK 1
64 #define CG_ERR 0
65
66 #ifndef SOL_TCP
67 #define SOL_TCP 6
68 #endif
69
70 struct tcp_exprm_opt {
71 __u8 kind;
72 __u8 len;
73 __u16 magic;
74 union {
75 __u8 data[4];
76 __u32 data32;
77 };
78 } __attribute__((packed));
79
80 struct tcp_opt {
81 __u8 kind;
82 __u8 len;
83 union {
84 __u8 data[4];
85 __u32 data32;
86 };
87 } __attribute__((packed));
88
89 struct {
90 __uint(type, BPF_MAP_TYPE_HASH);
91 __uint(max_entries, 2);
92 __type(key, int);
93 __type(value, struct linum_err);
94 } lport_linum_map SEC(".maps");
95
96 static inline unsigned int tcp_hdrlen(const struct tcphdr *th)
97 {
98 return th->doff << 2;
99 }
100
101 static inline __u8 skops_tcp_flags(const struct bpf_sock_ops *skops)
102 {
103 return skops->skb_tcp_flags;
104 }
105
106 static inline void clear_hdr_cb_flags(struct bpf_sock_ops *skops)
107 {
108 bpf_sock_ops_cb_flags_set(skops,
109 skops->bpf_sock_ops_cb_flags &
110 ~(BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |
111 BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG));
112 }
113
114 static inline void set_hdr_cb_flags(struct bpf_sock_ops *skops, __u32 extra)
115 {
116 bpf_sock_ops_cb_flags_set(skops,
117 skops->bpf_sock_ops_cb_flags |
118 BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |
119 BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG |
120 extra);
121 }
122 static inline void
123 clear_parse_all_hdr_cb_flags(struct bpf_sock_ops *skops)
124 {
125 bpf_sock_ops_cb_flags_set(skops,
126 skops->bpf_sock_ops_cb_flags &
127 ~BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG);
128 }
129
130 static inline void
131 set_parse_all_hdr_cb_flags(struct bpf_sock_ops *skops)
132 {
133 bpf_sock_ops_cb_flags_set(skops,
134 skops->bpf_sock_ops_cb_flags |
135 BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG);
136 }
137
138 #define RET_CG_ERR(__err) ({ \
139 struct linum_err __linum_err; \
140 int __lport; \
141 \
142 __linum_err.linum = __LINE__; \
143 __linum_err.err = __err; \
144 __lport = skops->local_port; \
145 bpf_map_update_elem(&lport_linum_map, &__lport, &__linum_err, BPF_NOEXIST); \
146 clear_hdr_cb_flags(skops); \
147 clear_parse_all_hdr_cb_flags(skops); \
148 return CG_ERR; \
149 })
150
151 #endif /* BPF_PROG_TEST_TCP_HDR_OPTIONS */
152
153 #endif /* _TEST_TCP_HDR_OPTIONS_H */
154
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