/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
#ifndef __MPTCP_BPF_H__
#define __MPTCP_BPF_H__

#include "bpf_experimental.h"

/* list helpers from include/linux/list.h */
static inline int list_is_head(const struct list_head *list,
                               const struct list_head *head)
{
        return list == head;
}

#define list_entry(ptr, type, member)                                   \
        container_of(ptr, type, member)

#define list_first_entry(ptr, type, member)                             \
        list_entry((ptr)->next, type, member)

#define list_next_entry(pos, member)                                    \
        list_entry((pos)->member.next, typeof(*(pos)), member)

#define list_entry_is_head(pos, head, member)                           \
        list_is_head(&pos->member, (head))

/* small difference: 'can_loop' has been added in the conditions */
#define list_for_each_entry(pos, head, member)                          \
        for (pos = list_first_entry(head, typeof(*pos), member);        \
             !list_entry_is_head(pos, head, member) && can_loop;        \
             pos = list_next_entry(pos, member))

/* mptcp helpers from protocol.h */
#define mptcp_for_each_subflow(__msk, __subflow)                        \
        list_for_each_entry(__subflow, &((__msk)->conn_list), node)

static __always_inline struct sock *
mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
{
        return subflow->tcp_sock;
}

#endif