/* * 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 <tgraf@suug.ch> *           Jamal Hadi Salim *           Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * 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/gen_stats.h>  static inline intgnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size){	RTA_PUT(d->skb, type, size, buf);	return 0; rtattr_failure:	spin_unlock_bh(d->lock);	return -1;} /** * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode * @skb: socket buffer to put statistics TLVs into * @type: TLV type for top level statistic TLV * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV * @xstats_type: TLV type for backward compatibility xstats TLV * @lock: statistics lock * @d: dumping handle * * Initializes the dumping handle, grabs the statistic lock and appends * an empty TLV header to the socket buffer for use a container for all * other statistic TLVS. * * The dumping handle is marked to be in backward compatibility mode telling * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. * * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. */intgnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,	int xstats_type, spinlock_t *lock, struct gnet_dump *d){	memset(d, 0, sizeof(*d));		spin_lock_bh(lock);	d->lock = lock;	if (type)		d->tail = (struct rtattr *) skb->tail;	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;} /** * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode * @skb: socket buffer to put statistics TLVs into * @type: TLV type for top level statistic TLV * @lock: statistics lock * @d: dumping handle * * Initializes the dumping handle, grabs the statistic lock and appends * an empty TLV header to the socket buffer for use a container for all * other statistic TLVS. * * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. */intgnet_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);} /** * gnet_stats_copy_basic - copy basic statistics into statistic TLV * @d: dumping handle * @b: basic statistics * * Appends the basic statistics to the top level TLV created by * gnet_stats_start_copy(). * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */intgnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b){	if (d->compat_tc_stats) {		d->tc_stats.bytes = b->bytes;		d->tc_stats.packets = b->packets;	} 	if (d->tail)		return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b)); 	return 0;} /** * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV * @d: dumping handle * @r: rate estimator statistics * * Appends the rate estimator statistics to the top level TLV created by * gnet_stats_start_copy(). * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */intgnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r){	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;} /** * gnet_stats_copy_queue - copy queue statistics into statistics TLV * @d: dumping handle * @q: queue statistics * * Appends the queue statistics to the top level TLV created by * gnet_stats_start_copy(). * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */intgnet_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;} /** * gnet_stats_copy_app - copy application specific statistics into statistics TLV * @d: dumping handle * @st: application specific statistics data * @len: length of data * * Appends the application sepecific statistics to the top level TLV created by * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping * handle is in backward compatibility mode. * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */intgnet_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;} /** * gnet_stats_finish_copy - finish dumping procedure * @d: dumping handle * * Corrects the length of the top level TLV to include all TLVs added * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs * if gnet_stats_start_copy_compat() was used and releases the statistics * lock. * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */intgnet_stats_finish_copy(struct gnet_dump *d){	if (d->tail)		d->tail->rta_len = d->skb->tail - (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_start_copy);EXPORT_SYMBOL(gnet_stats_start_copy_compat);EXPORT_SYMBOL(gnet_stats_copy_basic);EXPORT_SYMBOL(gnet_stats_copy_rate_est);EXPORT_SYMBOL(gnet_stats_copy_queue);EXPORT_SYMBOL(gnet_stats_copy_app);EXPORT_SYMBOL(gnet_stats_finish_copy);