// SPDX-License-Identifier: GPL-2.0
#include <linux/sysctl.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include <net/xfrm.h>

static void __net_init __xfrm_sysctl_init(struct net *net)
{
        net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME;
        net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
        net->xfrm.sysctl_larval_drop = 1;
        net->xfrm.sysctl_acq_expires = 30;
}

#ifdef CONFIG_SYSCTL
static struct ctl_table xfrm_table[] = {
        {
                .procname       = "xfrm_aevent_etime",
                .maxlen         = sizeof(u32),
                .mode           = 0644,
                .proc_handler   = proc_douintvec
        },
        {
                .procname       = "xfrm_aevent_rseqth",
                .maxlen         = sizeof(u32),
                .mode           = 0644,
                .proc_handler   = proc_douintvec
        },
        {
                .procname       = "xfrm_larval_drop",
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
        {
                .procname       = "xfrm_acq_expires",
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
};

int __net_init xfrm_sysctl_init(struct net *net)
{
        struct ctl_table *table;
        size_t table_size = ARRAY_SIZE(xfrm_table);

        __xfrm_sysctl_init(net);

        table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL);
        if (!table)
                goto out_kmemdup;
        table[0].data = &net->xfrm.sysctl_aevent_etime;
        table[1].data = &net->xfrm.sysctl_aevent_rseqth;
        table[2].data = &net->xfrm.sysctl_larval_drop;
        table[3].data = &net->xfrm.sysctl_acq_expires;

        /* Don't export sysctls to unprivileged users */
        if (net->user_ns != &init_user_ns)
                table_size = 0;

        net->xfrm.sysctl_hdr = register_net_sysctl_sz(net, "net/core", table,
                                                      table_size);
        if (!net->xfrm.sysctl_hdr)
                goto out_register;
        return 0;

out_register:
        kfree(table);
out_kmemdup:
        return -ENOMEM;
}

void __net_exit xfrm_sysctl_fini(struct net *net)
{
        const struct ctl_table *table;

        table = net->xfrm.sysctl_hdr->ctl_table_arg;
        unregister_net_sysctl_table(net->xfrm.sysctl_hdr);
        kfree(table);
}
#else
int __net_init xfrm_sysctl_init(struct net *net)
{
        __xfrm_sysctl_init(net);
        return 0;
}
#endif