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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2020 Facebook */
#ifndef _TEST_TCP_HDR_OPTIONS_H
#define _TEST_TCP_HDR_OPTIONS_H
struct bpf_test_option {
__u8 flags;
__u8 max_delack_ms;
__u8 rand;
} __attribute__((packed));
enum {
OPTION_RESEND,
OPTION_MAX_DELACK_MS,
OPTION_RAND,
__NR_OPTION_FLAGS,
};
#define OPTION_F_RESEND (1 << OPTION_RESEND)
#define OPTION_F_MAX_DELACK_MS (1 << OPTION_MAX_DELACK_MS)
#define OPTION_F_RAND (1 << OPTION_RAND)
#define OPTION_MASK ((1 << __NR_OPTION_FLAGS) - 1)
#define TEST_OPTION_FLAGS(flags, option) (1 & ((flags) >> (option)))
#define SET_OPTION_FLAGS(flags, option) ((flags) |= (1 << (option)))
/* Store in bpf_sk_storage */
struct hdr_stg {
bool active;
bool resend_syn; /* active side only */
bool syncookie; /* passive side only */
bool fastopen; /* passive side only */
};
struct linum_err {
unsigned int linum;
int err;
};
#define TCPHDR_FIN 0x01
#define TCPHDR_SYN 0x02
#define TCPHDR_RST 0x04
#define TCPHDR_PSH 0x08
#define TCPHDR_ACK 0x10
#define TCPHDR_URG 0x20
#define TCPHDR_ECE 0x40
#define TCPHDR_CWR 0x80
#define TCPHDR_SYNACK (TCPHDR_SYN | TCPHDR_ACK)
#define TCPOPT_EOL 0
#define TCPOPT_NOP 1
#define TCPOPT_MSS 2
#define TCPOPT_WINDOW 3
#define TCPOPT_EXP 254
#define TCP_BPF_EXPOPT_BASE_LEN 4
#define MAX_TCP_HDR_LEN 60
#define MAX_TCP_OPTION_SPACE 40
#ifdef BPF_PROG_TEST_TCP_HDR_OPTIONS
#define CG_OK 1
#define CG_ERR 0
#ifndef SOL_TCP
#define SOL_TCP 6
#endif
struct tcp_exprm_opt {
__u8 kind;
__u8 len;
__u16 magic;
union {
__u8 data[4];
__u32 data32;
};
} __attribute__((packed));
struct tcp_opt {
__u8 kind;
__u8 len;
union {
__u8 data[4];
__u32 data32;
};
} __attribute__((packed));
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 2);
__type(key, int);
__type(value, struct linum_err);
} lport_linum_map SEC(".maps");
static inline unsigned int tcp_hdrlen(const struct tcphdr *th)
{
return th->doff << 2;
}
static inline __u8 skops_tcp_flags(const struct bpf_sock_ops *skops)
{
return skops->skb_tcp_flags;
}
static inline void clear_hdr_cb_flags(struct bpf_sock_ops *skops)
{
bpf_sock_ops_cb_flags_set(skops,
skops->bpf_sock_ops_cb_flags &
~(BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG));
}
static inline void set_hdr_cb_flags(struct bpf_sock_ops *skops, __u32 extra)
{
bpf_sock_ops_cb_flags_set(skops,
skops->bpf_sock_ops_cb_flags |
BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |
BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG |
extra);
}
static inline void
clear_parse_all_hdr_cb_flags(struct bpf_sock_ops *skops)
{
bpf_sock_ops_cb_flags_set(skops,
skops->bpf_sock_ops_cb_flags &
~BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG);
}
static inline void
set_parse_all_hdr_cb_flags(struct bpf_sock_ops *skops)
{
bpf_sock_ops_cb_flags_set(skops,
skops->bpf_sock_ops_cb_flags |
BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG);
}
#define RET_CG_ERR(__err) ({ \
struct linum_err __linum_err; \
int __lport; \
\
__linum_err.linum = __LINE__; \
__linum_err.err = __err; \
__lport = skops->local_port; \
bpf_map_update_elem(&lport_linum_map, &__lport, &__linum_err, BPF_NOEXIST); \
clear_hdr_cb_flags(skops); \
clear_parse_all_hdr_cb_flags(skops); \
return CG_ERR; \
})
#endif /* BPF_PROG_TEST_TCP_HDR_OPTIONS */
#endif /* _TEST_TCP_HDR_OPTIONS_H */
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