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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
109gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b)
110{
111 if (d->compat_tc_stats) {
112 d->tc_stats.bytes = b->bytes;
113 d->tc_stats.packets = b->packets;
114 }
115
116 if (d->tail)
117 return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b));
118
119 return 0;
120}
121
122/**
123 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
124 * @d: dumping handle
125 * @r: rate estimator statistics
126 *
127 * Appends the rate estimator statistics to the top level TLV created by
128 * gnet_stats_start_copy().
129 *
130 * Returns 0 on success or -1 with the statistic lock released
131 * if the room in the socket buffer was not sufficient.
132 */
133int
134gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r)
135{
136 if (d->compat_tc_stats) {
137 d->tc_stats.bps = r->bps;
138 d->tc_stats.pps = r->pps;
139 }
140
141 if (d->tail)
142 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
143
144 return 0;
145}
146
147/**
148 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
149 * @d: dumping handle
150 * @q: queue statistics
151 *
152 * Appends the queue statistics to the top level TLV created by
153 * gnet_stats_start_copy().
154 *
155 * Returns 0 on success or -1 with the statistic lock released
156 * if the room in the socket buffer was not sufficient.
157 */
158int
159gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
160{
161 if (d->compat_tc_stats) {
162 d->tc_stats.drops = q->drops;
163 d->tc_stats.qlen = q->qlen;
164 d->tc_stats.backlog = q->backlog;
165 d->tc_stats.overlimits = q->overlimits;
166 }
167
168 if (d->tail)
169 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
170
171 return 0;
172}
173
174/**
175 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
176 * @d: dumping handle
177 * @st: application specific statistics data
178 * @len: length of data
179 *
180 * Appends the application sepecific statistics to the top level TLV created by
181 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
182 * handle is in backward compatibility mode.
183 *
184 * Returns 0 on success or -1 with the statistic lock released
185 * if the room in the socket buffer was not sufficient.
186 */
187int
188gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
189{
190 if (d->compat_xstats) {
191 d->xstats = st;
192 d->xstats_len = len;
193 }
194
195 if (d->tail)
196 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
197
198 return 0;
199}
200
201/**
202 * gnet_stats_finish_copy - finish dumping procedure
203 * @d: dumping handle
204 *
205 * Corrects the length of the top level TLV to include all TLVs added
206 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
207 * if gnet_stats_start_copy_compat() was used and releases the statistics
208 * lock.
209 *
210 * Returns 0 on success or -1 with the statistic lock released
211 * if the room in the socket buffer was not sufficient.
212 */
213int
214gnet_stats_finish_copy(struct gnet_dump *d)
215{
216 if (d->tail)
Patrick McHardy1e904742008-01-22 22:11:17 -0800217 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
219 if (d->compat_tc_stats)
220 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
221 sizeof(d->tc_stats)) < 0)
222 return -1;
223
224 if (d->compat_xstats && d->xstats) {
225 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
226 d->xstats_len) < 0)
227 return -1;
228 }
229
230 spin_unlock_bh(d->lock);
231 return 0;
232}
233
234
235EXPORT_SYMBOL(gnet_stats_start_copy);
236EXPORT_SYMBOL(gnet_stats_start_copy_compat);
237EXPORT_SYMBOL(gnet_stats_copy_basic);
238EXPORT_SYMBOL(gnet_stats_copy_rate_est);
239EXPORT_SYMBOL(gnet_stats_copy_queue);
240EXPORT_SYMBOL(gnet_stats_copy_app);
241EXPORT_SYMBOL(gnet_stats_finish_copy);