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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Patrick McHardy1e904742008-01-22 22:11:17 -080023#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <net/gen_stats.h>
25
26
27static inline int
28gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
29{
David S. Miller14ad6642012-04-01 20:47:35 -040030 if (nla_put(d->skb, type, size, buf))
31 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 return 0;
33
Patrick McHardy1e904742008-01-22 22:11:17 -080034nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 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)
Eric Dumazet9a429c42008-01-01 21:58:02 -080060 __acquires(lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
62 memset(d, 0, sizeof(*d));
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 spin_lock_bh(lock);
65 d->lock = lock;
66 if (type)
Patrick McHardy1e904742008-01-22 22:11:17 -080067 d->tail = (struct nlattr *)skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +000077EXPORT_SYMBOL(gnet_stats_start_copy_compat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +000098EXPORT_SYMBOL(gnet_stats_start_copy);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
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
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000112gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 if (d->compat_tc_stats) {
115 d->tc_stats.bytes = b->bytes;
116 d->tc_stats.packets = b->packets;
117 }
118
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000119 if (d->tail) {
120 struct gnet_stats_basic sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000122 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 return 0;
128}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000129EXPORT_SYMBOL(gnet_stats_copy_basic);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131/**
132 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
133 * @d: dumping handle
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000134 * @b: basic statistics
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 * @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
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000144gnet_stats_copy_rate_est(struct gnet_dump *d,
145 const struct gnet_stats_basic_packed *b,
146 struct gnet_stats_rate_est *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000148 if (b && !gen_estimator_active(b, r))
149 return 0;
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 if (d->compat_tc_stats) {
152 d->tc_stats.bps = r->bps;
153 d->tc_stats.pps = r->pps;
154 }
155
156 if (d->tail)
157 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
158
159 return 0;
160}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000161EXPORT_SYMBOL(gnet_stats_copy_rate_est);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163/**
164 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
165 * @d: dumping handle
166 * @q: queue statistics
167 *
168 * Appends the queue statistics to the top level TLV created by
169 * gnet_stats_start_copy().
170 *
171 * Returns 0 on success or -1 with the statistic lock released
172 * if the room in the socket buffer was not sufficient.
173 */
174int
175gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
176{
177 if (d->compat_tc_stats) {
178 d->tc_stats.drops = q->drops;
179 d->tc_stats.qlen = q->qlen;
180 d->tc_stats.backlog = q->backlog;
181 d->tc_stats.overlimits = q->overlimits;
182 }
183
184 if (d->tail)
185 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
186
187 return 0;
188}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000189EXPORT_SYMBOL(gnet_stats_copy_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191/**
192 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
193 * @d: dumping handle
194 * @st: application specific statistics data
195 * @len: length of data
196 *
197 * Appends the application sepecific statistics to the top level TLV created by
198 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
199 * handle is in backward compatibility mode.
200 *
201 * Returns 0 on success or -1 with the statistic lock released
202 * if the room in the socket buffer was not sufficient.
203 */
204int
205gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
206{
207 if (d->compat_xstats) {
208 d->xstats = st;
209 d->xstats_len = len;
210 }
211
212 if (d->tail)
213 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
214
215 return 0;
216}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000217EXPORT_SYMBOL(gnet_stats_copy_app);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
219/**
220 * gnet_stats_finish_copy - finish dumping procedure
221 * @d: dumping handle
222 *
223 * Corrects the length of the top level TLV to include all TLVs added
224 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
225 * if gnet_stats_start_copy_compat() was used and releases the statistics
226 * lock.
227 *
228 * Returns 0 on success or -1 with the statistic lock released
229 * if the room in the socket buffer was not sufficient.
230 */
231int
232gnet_stats_finish_copy(struct gnet_dump *d)
233{
234 if (d->tail)
Patrick McHardy1e904742008-01-22 22:11:17 -0800235 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 if (d->compat_tc_stats)
238 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
239 sizeof(d->tc_stats)) < 0)
240 return -1;
241
242 if (d->compat_xstats && d->xstats) {
243 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
244 d->xstats_len) < 0)
245 return -1;
246 }
247
248 spin_unlock_bh(d->lock);
249 return 0;
250}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251EXPORT_SYMBOL(gnet_stats_finish_copy);