/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NETNS_XFRM_H
#define __NETNS_XFRM_H

#include <linux/list.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/rhashtable-types.h>
#include <linux/xfrm.h>
#include <net/dst_ops.h>

struct ctl_table_header;

struct xfrm_policy_hash {
        struct hlist_head       __rcu *table;
        unsigned int            hmask;
        u8                      dbits4;
        u8                      sbits4;
        u8                      dbits6;
        u8                      sbits6;
};

struct xfrm_policy_hthresh {
        struct work_struct      work;
        seqlock_t               lock;
        u8                      lbits4;
        u8                      rbits4;
        u8                      lbits6;
        u8                      rbits6;
};

struct netns_xfrm {
        struct list_head        state_all;
        /*
         * Hash table to find appropriate SA towards given target (endpoint of
         * tunnel or destination of transport mode) allowed by selector.
         *
         * Main use is finding SA after policy selected tunnel or transport
         * mode. Also, it can be used by ah/esp icmp error handler to find
         * offending SA.
         */
        struct hlist_head       __rcu *state_bydst;
        struct hlist_head       __rcu *state_bysrc;
        struct hlist_head       __rcu *state_byspi;
        struct hlist_head       __rcu *state_byseq;
        struct hlist_head        __percpu *state_cache_input;
        unsigned int            state_hmask;
        unsigned int            state_num;
        struct work_struct      state_hash_work;

        struct list_head        policy_all;
        struct hlist_head       *policy_byidx;
        unsigned int            policy_idx_hmask;
        unsigned int            idx_generator;
        struct xfrm_policy_hash policy_bydst[XFRM_POLICY_MAX];
        unsigned int            policy_count[XFRM_POLICY_MAX * 2];
        struct work_struct      policy_hash_work;
        struct xfrm_policy_hthresh policy_hthresh;
        struct list_head        inexact_bins;


        struct sock             __rcu *nlsk;
        struct sock             *nlsk_stash;

        u32                     sysctl_aevent_etime;
        u32                     sysctl_aevent_rseqth;
        int                     sysctl_larval_drop;
        u32                     sysctl_acq_expires;

        u8                      policy_default[XFRM_POLICY_MAX];

#ifdef CONFIG_SYSCTL
        struct ctl_table_header *sysctl_hdr;
#endif

        struct dst_ops          xfrm4_dst_ops;
#if IS_ENABLED(CONFIG_IPV6)
        struct dst_ops          xfrm6_dst_ops;
#endif
        spinlock_t              xfrm_state_lock;
        seqcount_spinlock_t     xfrm_state_hash_generation;
        seqcount_spinlock_t     xfrm_policy_hash_generation;

        spinlock_t xfrm_policy_lock;
        struct mutex xfrm_cfg_mutex;
        struct delayed_work     nat_keepalive_work;
};

#endif