1/*
  2 * net/core/gen_stats.c
  3 *
  4 *             This program is free software; you can redistribute it and/or
  5 *             modify it under the terms of the GNU General Public License
  6 *             as published by the Free Software Foundation; either version
  7 *             2 of the License, or (at your option) any later version.
  8 *
  9 * Authors:  Thomas Graf <tgraf@suug.ch>
 10 *           Jamal Hadi Salim
 11 *           Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 12 *
 13 * See Documentation/networking/gen_stats.txt
 14 */
 15
 16#include <linux/types.h>
 17#include <linux/kernel.h>
 18#include <linux/module.h>
 19#include <linux/interrupt.h>
 20#include <linux/socket.h>
 21#include <linux/rtnetlink.h>
 22#include <linux/gen_stats.h>
 23#include <net/netlink.h>
 24#include <net/gen_stats.h>
 25
 26
 27static inline int
 28gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
 29{
 30	NLA_PUT(d->skb, type, size, buf);
 
 31	return 0;
 32
 33nla_put_failure:
 34	spin_unlock_bh(d->lock);
 35	return -1;
 36}
 37
 38/**
 39 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 40 * @skb: socket buffer to put statistics TLVs into
 41 * @type: TLV type for top level statistic TLV
 42 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
 43 * @xstats_type: TLV type for backward compatibility xstats TLV
 44 * @lock: statistics lock
 45 * @d: dumping handle
 46 *
 47 * Initializes the dumping handle, grabs the statistic lock and appends
 48 * an empty TLV header to the socket buffer for use a container for all
 49 * other statistic TLVS.
 50 *
 51 * The dumping handle is marked to be in backward compatibility mode telling
 52 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
 53 *
 54 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 55 */
 56int
 57gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
 58	int xstats_type, spinlock_t *lock, struct gnet_dump *d)
 59	__acquires(lock)
 60{
 61	memset(d, 0, sizeof(*d));
 62
 63	spin_lock_bh(lock);
 64	d->lock = lock;
 65	if (type)
 66		d->tail = (struct nlattr *)skb_tail_pointer(skb);
 67	d->skb = skb;
 68	d->compat_tc_stats = tc_stats_type;
 69	d->compat_xstats = xstats_type;
 70
 71	if (d->tail)
 72		return gnet_stats_copy(d, type, NULL, 0);
 73
 74	return 0;
 75}
 76EXPORT_SYMBOL(gnet_stats_start_copy_compat);
 77
 78/**
 79 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 80 * @skb: socket buffer to put statistics TLVs into
 81 * @type: TLV type for top level statistic TLV
 82 * @lock: statistics lock
 83 * @d: dumping handle
 84 *
 85 * Initializes the dumping handle, grabs the statistic lock and appends
 86 * an empty TLV header to the socket buffer for use a container for all
 87 * other statistic TLVS.
 88 *
 89 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 90 */
 91int
 92gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
 93	struct gnet_dump *d)
 94{
 95	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
 96}
 97EXPORT_SYMBOL(gnet_stats_start_copy);
 98
 99/**
100 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
101 * @d: dumping handle
102 * @b: basic statistics
103 *
104 * Appends the basic statistics to the top level TLV created by
105 * gnet_stats_start_copy().
106 *
107 * Returns 0 on success or -1 with the statistic lock released
108 * if the room in the socket buffer was not sufficient.
109 */
110int
111gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
112{
113	if (d->compat_tc_stats) {
114		d->tc_stats.bytes = b->bytes;
115		d->tc_stats.packets = b->packets;
116	}
117
118	if (d->tail) {
119		struct gnet_stats_basic sb;
120
121		memset(&sb, 0, sizeof(sb));
122		sb.bytes = b->bytes;
123		sb.packets = b->packets;
124		return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
125	}
126	return 0;
127}
128EXPORT_SYMBOL(gnet_stats_copy_basic);
129
130/**
131 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
132 * @d: dumping handle
133 * @b: basic statistics
134 * @r: rate estimator statistics
135 *
136 * Appends the rate estimator statistics to the top level TLV created by
137 * gnet_stats_start_copy().
138 *
139 * Returns 0 on success or -1 with the statistic lock released
140 * if the room in the socket buffer was not sufficient.
141 */
142int
143gnet_stats_copy_rate_est(struct gnet_dump *d,
144			 const struct gnet_stats_basic_packed *b,
145			 struct gnet_stats_rate_est *r)
146{
 
 
 
147	if (b && !gen_estimator_active(b, r))
148		return 0;
149
 
 
 
 
150	if (d->compat_tc_stats) {
151		d->tc_stats.bps = r->bps;
152		d->tc_stats.pps = r->pps;
153	}
154
155	if (d->tail)
156		return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
 
 
 
 
 
157
158	return 0;
159}
160EXPORT_SYMBOL(gnet_stats_copy_rate_est);
161
162/**
163 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
164 * @d: dumping handle
165 * @q: queue statistics
166 *
167 * Appends the queue statistics to the top level TLV created by
168 * gnet_stats_start_copy().
169 *
170 * Returns 0 on success or -1 with the statistic lock released
171 * if the room in the socket buffer was not sufficient.
172 */
173int
174gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
175{
176	if (d->compat_tc_stats) {
177		d->tc_stats.drops = q->drops;
178		d->tc_stats.qlen = q->qlen;
179		d->tc_stats.backlog = q->backlog;
180		d->tc_stats.overlimits = q->overlimits;
181	}
182
183	if (d->tail)
184		return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
185
186	return 0;
187}
188EXPORT_SYMBOL(gnet_stats_copy_queue);
189
190/**
191 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
192 * @d: dumping handle
193 * @st: application specific statistics data
194 * @len: length of data
195 *
196 * Appends the application sepecific statistics to the top level TLV created by
197 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
198 * handle is in backward compatibility mode.
199 *
200 * Returns 0 on success or -1 with the statistic lock released
201 * if the room in the socket buffer was not sufficient.
202 */
203int
204gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
205{
206	if (d->compat_xstats) {
207		d->xstats = st;
208		d->xstats_len = len;
209	}
210
211	if (d->tail)
212		return gnet_stats_copy(d, TCA_STATS_APP, st, len);
213
214	return 0;
215}
216EXPORT_SYMBOL(gnet_stats_copy_app);
217
218/**
219 * gnet_stats_finish_copy - finish dumping procedure
220 * @d: dumping handle
221 *
222 * Corrects the length of the top level TLV to include all TLVs added
223 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
224 * if gnet_stats_start_copy_compat() was used and releases the statistics
225 * lock.
226 *
227 * Returns 0 on success or -1 with the statistic lock released
228 * if the room in the socket buffer was not sufficient.
229 */
230int
231gnet_stats_finish_copy(struct gnet_dump *d)
232{
233	if (d->tail)
234		d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
235
236	if (d->compat_tc_stats)
237		if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
238			sizeof(d->tc_stats)) < 0)
239			return -1;
240
241	if (d->compat_xstats && d->xstats) {
242		if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
243			d->xstats_len) < 0)
244			return -1;
245	}
246
247	spin_unlock_bh(d->lock);
248	return 0;
249}
250EXPORT_SYMBOL(gnet_stats_finish_copy);

  1/*
  2 * net/core/gen_stats.c
  3 *
  4 *             This program is free software; you can redistribute it and/or
  5 *             modify it under the terms of the GNU General Public License
  6 *             as published by the Free Software Foundation; either version
  7 *             2 of the License, or (at your option) any later version.
  8 *
  9 * Authors:  Thomas Graf <tgraf@suug.ch>
 10 *           Jamal Hadi Salim
 11 *           Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 12 *
 13 * See Documentation/networking/gen_stats.txt
 14 */
 15
 16#include <linux/types.h>
 17#include <linux/kernel.h>
 18#include <linux/module.h>
 19#include <linux/interrupt.h>
 20#include <linux/socket.h>
 21#include <linux/rtnetlink.h>
 22#include <linux/gen_stats.h>
 23#include <net/netlink.h>
 24#include <net/gen_stats.h>
 25
 26
 27static inline int
 28gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
 29{
 30	if (nla_put(d->skb, type, size, buf))
 31		goto nla_put_failure;
 32	return 0;
 33
 34nla_put_failure:
 35	spin_unlock_bh(d->lock);
 36	return -1;
 37}
 38
 39/**
 40 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 41 * @skb: socket buffer to put statistics TLVs into
 42 * @type: TLV type for top level statistic TLV
 43 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
 44 * @xstats_type: TLV type for backward compatibility xstats TLV
 45 * @lock: statistics lock
 46 * @d: dumping handle
 47 *
 48 * Initializes the dumping handle, grabs the statistic lock and appends
 49 * an empty TLV header to the socket buffer for use a container for all
 50 * other statistic TLVS.
 51 *
 52 * The dumping handle is marked to be in backward compatibility mode telling
 53 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
 54 *
 55 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 56 */
 57int
 58gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
 59	int xstats_type, spinlock_t *lock, struct gnet_dump *d)
 60	__acquires(lock)
 61{
 62	memset(d, 0, sizeof(*d));
 63
 64	spin_lock_bh(lock);
 65	d->lock = lock;
 66	if (type)
 67		d->tail = (struct nlattr *)skb_tail_pointer(skb);
 68	d->skb = skb;
 69	d->compat_tc_stats = tc_stats_type;
 70	d->compat_xstats = xstats_type;
 71
 72	if (d->tail)
 73		return gnet_stats_copy(d, type, NULL, 0);
 74
 75	return 0;
 76}
 77EXPORT_SYMBOL(gnet_stats_start_copy_compat);
 78
 79/**
 80 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
 81 * @skb: socket buffer to put statistics TLVs into
 82 * @type: TLV type for top level statistic TLV
 83 * @lock: statistics lock
 84 * @d: dumping handle
 85 *
 86 * Initializes the dumping handle, grabs the statistic lock and appends
 87 * an empty TLV header to the socket buffer for use a container for all
 88 * other statistic TLVS.
 89 *
 90 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
 91 */
 92int
 93gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
 94	struct gnet_dump *d)
 95{
 96	return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
 97}
 98EXPORT_SYMBOL(gnet_stats_start_copy);
 99
100/**
101 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
102 * @d: dumping handle
103 * @b: basic statistics
104 *
105 * Appends the basic statistics to the top level TLV created by
106 * gnet_stats_start_copy().
107 *
108 * Returns 0 on success or -1 with the statistic lock released
109 * if the room in the socket buffer was not sufficient.
110 */
111int
112gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
113{
114	if (d->compat_tc_stats) {
115		d->tc_stats.bytes = b->bytes;
116		d->tc_stats.packets = b->packets;
117	}
118
119	if (d->tail) {
120		struct gnet_stats_basic sb;
121
122		memset(&sb, 0, sizeof(sb));
123		sb.bytes = b->bytes;
124		sb.packets = b->packets;
125		return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
126	}
127	return 0;
128}
129EXPORT_SYMBOL(gnet_stats_copy_basic);
130
131/**
132 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
133 * @d: dumping handle
134 * @b: basic statistics
135 * @r: rate estimator statistics
136 *
137 * Appends the rate estimator statistics to the top level TLV created by
138 * gnet_stats_start_copy().
139 *
140 * Returns 0 on success or -1 with the statistic lock released
141 * if the room in the socket buffer was not sufficient.
142 */
143int
144gnet_stats_copy_rate_est(struct gnet_dump *d,
145			 const struct gnet_stats_basic_packed *b,
146			 struct gnet_stats_rate_est64 *r)
147{
148	struct gnet_stats_rate_est est;
149	int res;
150
151	if (b && !gen_estimator_active(b, r))
152		return 0;
153
154	est.bps = min_t(u64, UINT_MAX, r->bps);
155	/* we have some time before reaching 2^32 packets per second */
156	est.pps = r->pps;
157
158	if (d->compat_tc_stats) {
159		d->tc_stats.bps = est.bps;
160		d->tc_stats.pps = est.pps;
161	}
162
163	if (d->tail) {
164		res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est));
165		if (res < 0 || est.bps == r->bps)
166			return res;
167		/* emit 64bit stats only if needed */
168		return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r));
169	}
170
171	return 0;
172}
173EXPORT_SYMBOL(gnet_stats_copy_rate_est);
174
175/**
176 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
177 * @d: dumping handle
178 * @q: queue statistics
179 *
180 * Appends the queue statistics to the top level TLV created by
181 * gnet_stats_start_copy().
182 *
183 * Returns 0 on success or -1 with the statistic lock released
184 * if the room in the socket buffer was not sufficient.
185 */
186int
187gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
188{
189	if (d->compat_tc_stats) {
190		d->tc_stats.drops = q->drops;
191		d->tc_stats.qlen = q->qlen;
192		d->tc_stats.backlog = q->backlog;
193		d->tc_stats.overlimits = q->overlimits;
194	}
195
196	if (d->tail)
197		return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
198
199	return 0;
200}
201EXPORT_SYMBOL(gnet_stats_copy_queue);
202
203/**
204 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
205 * @d: dumping handle
206 * @st: application specific statistics data
207 * @len: length of data
208 *
209 * Appends the application sepecific statistics to the top level TLV created by
210 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
211 * handle is in backward compatibility mode.
212 *
213 * Returns 0 on success or -1 with the statistic lock released
214 * if the room in the socket buffer was not sufficient.
215 */
216int
217gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
218{
219	if (d->compat_xstats) {
220		d->xstats = st;
221		d->xstats_len = len;
222	}
223
224	if (d->tail)
225		return gnet_stats_copy(d, TCA_STATS_APP, st, len);
226
227	return 0;
228}
229EXPORT_SYMBOL(gnet_stats_copy_app);
230
231/**
232 * gnet_stats_finish_copy - finish dumping procedure
233 * @d: dumping handle
234 *
235 * Corrects the length of the top level TLV to include all TLVs added
236 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
237 * if gnet_stats_start_copy_compat() was used and releases the statistics
238 * lock.
239 *
240 * Returns 0 on success or -1 with the statistic lock released
241 * if the room in the socket buffer was not sufficient.
242 */
243int
244gnet_stats_finish_copy(struct gnet_dump *d)
245{
246	if (d->tail)
247		d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
248
249	if (d->compat_tc_stats)
250		if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
251			sizeof(d->tc_stats)) < 0)
252			return -1;
253
254	if (d->compat_xstats && d->xstats) {
255		if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
256			d->xstats_len) < 0)
257			return -1;
258	}
259
260	spin_unlock_bh(d->lock);
261	return 0;
262}
263EXPORT_SYMBOL(gnet_stats_finish_copy);