bpf: tcp: Do not limit cb_flags when creating child sk from listen sk

#endif /* CONFIG_NET_SOCK_MSG */

#ifdef CONFIG_CGROUP_BPF

/* Copy the listen sk's HDR_OPT_CB flags to its child.

 *

 * During 3-Way-HandShake, the synack is usually sent from

 * the listen sk with the HDR_OPT_CB flags set so that

 * bpf-prog will be called to write the BPF hdr option.

 *

 * In fastopen, the child sk is used to send synack instead

 * of the listen sk.  Thus, inheriting the HDR_OPT_CB flags

 * from the listen sk gives the bpf-prog a chance to write

 * BPF hdr option in the synack pkt during fastopen.

 *

 * Both fastopen and non-fastopen child will inherit the

 * HDR_OPT_CB flags to keep the bpf-prog having a consistent

 * behavior when deciding to clear this cb flags (or not)

 * during the PASSIVE_ESTABLISHED_CB.

 *

 * In the future, other cb flags could be inherited here also.

 */

static inline void bpf_skops_init_child(const struct sock *sk,

					struct sock *child)

{

	tcp_sk(child)->bpf_sock_ops_cb_flags =

		tcp_sk(sk)->bpf_sock_ops_cb_flags &

		(BPF_SOCK_OPS_PARSE_ALL_HDR_OPT_CB_FLAG |

		 BPF_SOCK_OPS_PARSE_UNKNOWN_HDR_OPT_CB_FLAG |

		 BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG);

}

static inline void bpf_skops_init_skb(struct bpf_sock_ops_kern *skops,

				      struct sk_buff *skb,

				      unsigned int end_offset)

	skops->skb_data_end = skb->data + end_offset;

}

#else

static inline void bpf_skops_init_child(const struct sock *sk,

					struct sock *child)

{

}

static inline void bpf_skops_init_skb(struct bpf_sock_ops_kern *skops,

				      struct sk_buff *skb,

				      unsigned int end_offset)

	newtp->fastopen_req = NULL;

	RCU_INIT_POINTER(newtp->fastopen_rsk, NULL);

	bpf_skops_init_child(sk, newsk);

	tcp_bpf_clone(sk, newsk);

	__TCP_INC_STATS(sock_net(sk), TCP_MIB_PASSIVEOPENS);