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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}
76
77/**
78 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
79 * @skb: socket buffer to put statistics TLVs into
80 * @type: TLV type for top level statistic TLV
81 * @lock: statistics lock
82 * @d: dumping handle
83 *
84 * Initializes the dumping handle, grabs the statistic lock and appends
85 * an empty TLV header to the socket buffer for use a container for all
86 * other statistic TLVS.
87 *
88 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
89 */
90int
91gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
92 struct gnet_dump *d)
93{
94 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
95}
96
97/**
98 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
99 * @d: dumping handle
100 * @b: basic statistics
101 *
102 * Appends the basic statistics to the top level TLV created by
103 * gnet_stats_start_copy().
104 *
105 * Returns 0 on success or -1 with the statistic lock released
106 * if the room in the socket buffer was not sufficient.
107 */
108int
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000109gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 if (d->compat_tc_stats) {
112 d->tc_stats.bytes = b->bytes;
113 d->tc_stats.packets = b->packets;
114 }
115
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000116 if (d->tail) {
117 struct gnet_stats_basic sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +0000119 memset(&sb, 0, sizeof(sb));
120 sb.bytes = b->bytes;
121 sb.packets = b->packets;
122 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return 0;
125}
126
127/**
128 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
129 * @d: dumping handle
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000130 * @b: basic statistics
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * @r: rate estimator statistics
132 *
133 * Appends the rate estimator statistics to the top level TLV created by
134 * gnet_stats_start_copy().
135 *
136 * Returns 0 on success or -1 with the statistic lock released
137 * if the room in the socket buffer was not sufficient.
138 */
139int
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000140gnet_stats_copy_rate_est(struct gnet_dump *d,
141 const struct gnet_stats_basic_packed *b,
142 struct gnet_stats_rate_est *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Eric Dumazetd250a5f2009-10-02 10:32:18 +0000144 if (b && !gen_estimator_active(b, r))
145 return 0;
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (d->compat_tc_stats) {
148 d->tc_stats.bps = r->bps;
149 d->tc_stats.pps = r->pps;
150 }
151
152 if (d->tail)
153 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
154
155 return 0;
156}
157
158/**
159 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
160 * @d: dumping handle
161 * @q: queue statistics
162 *
163 * Appends the queue statistics to the top level TLV created by
164 * gnet_stats_start_copy().
165 *
166 * Returns 0 on success or -1 with the statistic lock released
167 * if the room in the socket buffer was not sufficient.
168 */
169int
170gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
171{
172 if (d->compat_tc_stats) {
173 d->tc_stats.drops = q->drops;
174 d->tc_stats.qlen = q->qlen;
175 d->tc_stats.backlog = q->backlog;
176 d->tc_stats.overlimits = q->overlimits;
177 }
178
179 if (d->tail)
180 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
181
182 return 0;
183}
184
185/**
186 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
187 * @d: dumping handle
188 * @st: application specific statistics data
189 * @len: length of data
190 *
191 * Appends the application sepecific statistics to the top level TLV created by
192 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
193 * handle is in backward compatibility mode.
194 *
195 * Returns 0 on success or -1 with the statistic lock released
196 * if the room in the socket buffer was not sufficient.
197 */
198int
199gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
200{
201 if (d->compat_xstats) {
202 d->xstats = st;
203 d->xstats_len = len;
204 }
205
206 if (d->tail)
207 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
208
209 return 0;
210}
211
212/**
213 * gnet_stats_finish_copy - finish dumping procedure
214 * @d: dumping handle
215 *
216 * Corrects the length of the top level TLV to include all TLVs added
217 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
218 * if gnet_stats_start_copy_compat() was used and releases the statistics
219 * lock.
220 *
221 * Returns 0 on success or -1 with the statistic lock released
222 * if the room in the socket buffer was not sufficient.
223 */
224int
225gnet_stats_finish_copy(struct gnet_dump *d)
226{
227 if (d->tail)
Patrick McHardy1e904742008-01-22 22:11:17 -0800228 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 if (d->compat_tc_stats)
231 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
232 sizeof(d->tc_stats)) < 0)
233 return -1;
234
235 if (d->compat_xstats && d->xstats) {
236 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
237 d->xstats_len) < 0)
238 return -1;
239 }
240
241 spin_unlock_bh(d->lock);
242 return 0;
243}
244
245
246EXPORT_SYMBOL(gnet_stats_start_copy);
247EXPORT_SYMBOL(gnet_stats_start_copy_compat);
248EXPORT_SYMBOL(gnet_stats_copy_basic);
249EXPORT_SYMBOL(gnet_stats_copy_rate_est);
250EXPORT_SYMBOL(gnet_stats_copy_queue);
251EXPORT_SYMBOL(gnet_stats_copy_app);
252EXPORT_SYMBOL(gnet_stats_finish_copy);