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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{
Patrick McHardy1e904742008-01-22 22:11:17 -080030 NLA_PUT(d->skb, type, size, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 return 0;
32
Patrick McHardy1e904742008-01-22 22:11:17 -080033nla_put_failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 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)
Eric Dumazet9a429c42008-01-01 21:58:02 -080059 __acquires(lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
61 memset(d, 0, sizeof(*d));
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 spin_lock_bh(lock);
64 d->lock = lock;
65 if (type)
Patrick McHardy1e904742008-01-22 22:11:17 -080066 d->tail = (struct nlattr *)skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +000076EXPORT_SYMBOL(gnet_stats_start_copy_compat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +000097EXPORT_SYMBOL(gnet_stats_start_copy);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
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
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000111gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
113 if (d->compat_tc_stats) {
114 d->tc_stats.bytes = b->bytes;
115 d->tc_stats.packets = b->packets;
116 }
117
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000118 if (d->tail) {
119 struct gnet_stats_basic sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000121 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return 0;
127}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000128EXPORT_SYMBOL(gnet_stats_copy_basic);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130/**
131 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
132 * @d: dumping handle
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000133 * @b: basic statistics
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * @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
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000143gnet_stats_copy_rate_est(struct gnet_dump *d,
144 const struct gnet_stats_basic_packed *b,
145 struct gnet_stats_rate_est *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000147 if (b && !gen_estimator_active(b, r))
148 return 0;
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000160EXPORT_SYMBOL(gnet_stats_copy_rate_est);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000188EXPORT_SYMBOL(gnet_stats_copy_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
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}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000216EXPORT_SYMBOL(gnet_stats_copy_app);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
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)
Patrick McHardy1e904742008-01-22 22:11:17 -0800234 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250EXPORT_SYMBOL(gnet_stats_finish_copy);