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/gen_stats.h>
24
25
26 static inline int
27 gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
28 {
29 RTA_PUT(d->skb, type, size, buf);
30 return 0;
31
32 rtattr_failure:
33 spin_unlock_bh(d->lock);
34 return -1;
35 }
36
37 /**
38 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
39 * @skb: socket buffer to put statistics TLVs into
40 * @type: TLV type for top level statistic TLV
41 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
42 * @xstats_type: TLV type for backward compatibility xstats TLV
43 * @lock: statistics lock
44 * @d: dumping handle
45 *
46 * Initializes the dumping handle, grabs the statistic lock and appends
47 * an empty TLV header to the socket buffer for use a container for all
48 * other statistic TLVS.
49 *
50 * The dumping handle is marked to be in backward compatibility mode telling
51 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
52 *
53 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
54 */
55 int
56 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
57 int xstats_type, spinlock_t *lock, struct gnet_dump *d)
58 {
59 spin_lock_bh(lock);
60 d->lock = lock;
61 d->tail = (struct rtattr *) skb->tail;
62 d->skb = skb;
63 d->compat_tc_stats = tc_stats_type;
64 d->compat_xstats = xstats_type;
65 d->xstats = NULL;
66
67 if (d->compat_tc_stats)
68 memset(&d->tc_stats, 0, sizeof(d->tc_stats));
69
70 return gnet_stats_copy(d, type, NULL, 0);
71 }
72
73 /**
74 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
75 * @skb: socket buffer to put statistics TLVs into
76 * @type: TLV type for top level statistic TLV
77 * @lock: statistics lock
78 * @d: dumping handle
79 *
80 * Initializes the dumping handle, grabs the statistic lock and appends
81 * an empty TLV header to the socket buffer for use a container for all
82 * other statistic TLVS.
83 *
84 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
85 */
86 int
87 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
88 struct gnet_dump *d)
89 {
90 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
91 }
92
93 /**
94 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
95 * @d: dumping handle
96 * @b: basic statistics
97 *
98 * Appends the basic statistics to the top level TLV created by
99 * gnet_stats_start_copy().
100 *
101 * Returns 0 on success or -1 with the statistic lock released
102 * if the room in the socket buffer was not sufficient.
103 */
104 int
105 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic *b)
106 {
107 if (d->compat_tc_stats) {
108 d->tc_stats.bytes = b->bytes;
109 d->tc_stats.packets = b->packets;
110 }
111
112 return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b));
113 }
114
115 /**
116 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
117 * @d: dumping handle
118 * @r: rate estimator statistics
119 *
120 * Appends the rate estimator statistics to the top level TLV created by
121 * gnet_stats_start_copy().
122 *
123 * Returns 0 on success or -1 with the statistic lock released
124 * if the room in the socket buffer was not sufficient.
125 */
126 int
127 gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r)
128 {
129 if (d->compat_tc_stats) {
130 d->tc_stats.bps = r->bps;
131 d->tc_stats.pps = r->pps;
132 }
133
134 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
135 }
136
137 /**
138 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
139 * @d: dumping handle
140 * @q: queue statistics
141 *
142 * Appends the queue statistics to the top level TLV created by
143 * gnet_stats_start_copy().
144 *
145 * Returns 0 on success or -1 with the statistic lock released
146 * if the room in the socket buffer was not sufficient.
147 */
148 int
149 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
150 {
151 if (d->compat_tc_stats) {
152 d->tc_stats.drops = q->drops;
153 d->tc_stats.qlen = q->qlen;
154 d->tc_stats.backlog = q->backlog;
155 d->tc_stats.overlimits = q->overlimits;
156 }
157
158 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
159 }
160
161 /**
162 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
163 * @d: dumping handle
164 * @st: application specific statistics data
165 * @len: length of data
166 *
167 * Appends the application sepecific statistics to the top level TLV created by
168 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
169 * handle is in backward compatibility mode.
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 */
174 int
175 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
176 {
177 if (d->compat_xstats)
178 d->xstats = (struct rtattr *) d->skb->tail;
179 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
180 }
181
182 /**
183 * gnet_stats_finish_copy - finish dumping procedure
184 * @d: dumping handle
185 *
186 * Corrects the length of the top level TLV to include all TLVs added
187 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
188 * if gnet_stats_start_copy_compat() was used and releases the statistics
189 * lock.
190 *
191 * Returns 0 on success or -1 with the statistic lock released
192 * if the room in the socket buffer was not sufficient.
193 */
194 int
195 gnet_stats_finish_copy(struct gnet_dump *d)
196 {
197 d->tail->rta_len = d->skb->tail - (u8 *) d->tail;
198
199 if (d->compat_tc_stats)
200 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
201 sizeof(d->tc_stats)) < 0)
202 return -1;
203
204 if (d->compat_xstats && d->xstats) {
205 if (gnet_stats_copy(d, d->compat_xstats, RTA_DATA(d->xstats),
206 RTA_PAYLOAD(d->xstats)) < 0)
207 return -1;
208 }
209
210 spin_unlock_bh(d->lock);
211 return 0;
212 }
213
214
215 EXPORT_SYMBOL(gnet_stats_start_copy);
216 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
217 EXPORT_SYMBOL(gnet_stats_copy_basic);
218 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
219 EXPORT_SYMBOL(gnet_stats_copy_queue);
220 EXPORT_SYMBOL(gnet_stats_copy_app);
221 EXPORT_SYMBOL(gnet_stats_finish_copy);
222
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