xfrm_sysctl.c

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#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_dointvec
    },
    {
        .procname   = "xfrm_aevent_rseqth",
        .maxlen     = sizeof(u32),
        .mode       = 0644,
        .proc_handler   = proc_dointvec
    },
    {
        .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;

    __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;

    net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table);
    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)
{
    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