gen_stats.c

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/*
 * net/core/gen_stats.c
 *
 *             This program is free software; you can redistribute it and/or
 *             modify it under the terms of the GNU General Public License
 *             as published by the Free Software Foundation; either version
 *             2 of the License, or (at your option) any later version.
 *
 * Authors:  Thomas Graf <[email protected]>
 *           Jamal Hadi Salim
 *           Alexey Kuznetsov, <[email protected]>
 *
 * See Documentation/networking/gen_stats.txt
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/rtnetlink.h>
#include <linux/gen_stats.h>
#include <net/netlink.h>
#include <net/gen_stats.h>


static inline int
gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
{
    if (nla_put(d->skb, type, size, buf))
        goto nla_put_failure;
    return 0;

nla_put_failure:
    spin_unlock_bh(d->lock);
    return -1;
}

int
gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
    int xstats_type, spinlock_t *lock, struct gnet_dump *d)
    __acquires(lock)
{
    memset(d, 0, sizeof(*d));

    spin_lock_bh(lock);
    d->lock = lock;
    if (type)
        d->tail = (struct nlattr *)skb_tail_pointer(skb);
    d->skb = skb;
    d->compat_tc_stats = tc_stats_type;
    d->compat_xstats = xstats_type;

    if (d->tail)
        return gnet_stats_copy(d, type, NULL, 0);

    return 0;
}
EXPORT_SYMBOL(gnet_stats_start_copy_compat);

int
gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
    struct gnet_dump *d)
{
    return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
}
EXPORT_SYMBOL(gnet_stats_start_copy);

int
gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
{
    if (d->compat_tc_stats) {
        d->tc_stats.bytes = b->bytes;
        d->tc_stats.packets = b->packets;
    }

    if (d->tail) {
        struct gnet_stats_basic sb;

        memset(&sb, 0, sizeof(sb));
        sb.bytes = b->bytes;
        sb.packets = b->packets;
        return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
    }
    return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_basic);

int
gnet_stats_copy_rate_est(struct gnet_dump *d,
             const struct gnet_stats_basic_packed *b,
             struct gnet_stats_rate_est *r)
{
    if (b && !gen_estimator_active(b, r))
        return 0;

    if (d->compat_tc_stats) {
        d->tc_stats.bps = r->bps;
        d->tc_stats.pps = r->pps;
    }

    if (d->tail)
        return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));

    return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_rate_est);

int
gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
{
    if (d->compat_tc_stats) {
        d->tc_stats.drops = q->drops;
        d->tc_stats.qlen = q->qlen;
        d->tc_stats.backlog = q->backlog;
        d->tc_stats.overlimits = q->overlimits;
    }

    if (d->tail)
        return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));

    return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_queue);

int
gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
{
    if (d->compat_xstats) {
        d->xstats = st;
        d->xstats_len = len;
    }

    if (d->tail)
        return gnet_stats_copy(d, TCA_STATS_APP, st, len);

    return 0;
}
EXPORT_SYMBOL(gnet_stats_copy_app);

int
gnet_stats_finish_copy(struct gnet_dump *d)
{
    if (d->tail)
        d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;

    if (d->compat_tc_stats)
        if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
            sizeof(d->tc_stats)) < 0)
            return -1;

    if (d->compat_xstats && d->xstats) {
        if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
            d->xstats_len) < 0)
            return -1;
    }

    spin_unlock_bh(d->lock);
    return 0;
}
EXPORT_SYMBOL(gnet_stats_finish_copy);