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/netlink.h>
24 #include <net/gen_stats.h>
25
26
27 static inline int
28 gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
29 {
30 NLA_PUT(d->skb, type, size, buf);
31 return 0;
32
33 nla_put_failure:
34 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 */
56 int
57 gnet_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)
59 __acquires(lock)
60 {
61 memset(d, 0, sizeof(*d));
62
63 spin_lock_bh(lock);
64 d->lock = lock;
65 if (type)
66 d->tail = (struct nlattr *)skb_tail_pointer(skb);
67 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 */
90 int
91 gnet_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 */
108 int
109 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *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 struct gnet_stats_basic sb;
118
119 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 }
124 return 0;
125 }
126
127 /**
128 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
129 * @d: dumping handle
130 * @r: rate estimator statistics
131 *
132 * Appends the rate estimator statistics to the top level TLV created by
133 * gnet_stats_start_copy().
134 *
135 * Returns 0 on success or -1 with the statistic lock released
136 * if the room in the socket buffer was not sufficient.
137 */
138 int
139 gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r)
140 {
141 if (d->compat_tc_stats) {
142 d->tc_stats.bps = r->bps;
143 d->tc_stats.pps = r->pps;
144 }
145
146 if (d->tail)
147 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
148
149 return 0;
150 }
151
152 /**
153 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
154 * @d: dumping handle
155 * @q: queue statistics
156 *
157 * Appends the queue statistics to the top level TLV created by
158 * gnet_stats_start_copy().
159 *
160 * Returns 0 on success or -1 with the statistic lock released
161 * if the room in the socket buffer was not sufficient.
162 */
163 int
164 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
165 {
166 if (d->compat_tc_stats) {
167 d->tc_stats.drops = q->drops;
168 d->tc_stats.qlen = q->qlen;
169 d->tc_stats.backlog = q->backlog;
170 d->tc_stats.overlimits = q->overlimits;
171 }
172
173 if (d->tail)
174 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
175
176 return 0;
177 }
178
179 /**
180 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
181 * @d: dumping handle
182 * @st: application specific statistics data
183 * @len: length of data
184 *
185 * Appends the application sepecific statistics to the top level TLV created by
186 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
187 * handle is in backward compatibility mode.
188 *
189 * Returns 0 on success or -1 with the statistic lock released
190 * if the room in the socket buffer was not sufficient.
191 */
192 int
193 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
194 {
195 if (d->compat_xstats) {
196 d->xstats = st;
197 d->xstats_len = len;
198 }
199
200 if (d->tail)
201 return gnet_stats_copy(d, TCA_STATS_APP, st, len);
202
203 return 0;
204 }
205
206 /**
207 * gnet_stats_finish_copy - finish dumping procedure
208 * @d: dumping handle
209 *
210 * Corrects the length of the top level TLV to include all TLVs added
211 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
212 * if gnet_stats_start_copy_compat() was used and releases the statistics
213 * lock.
214 *
215 * Returns 0 on success or -1 with the statistic lock released
216 * if the room in the socket buffer was not sufficient.
217 */
218 int
219 gnet_stats_finish_copy(struct gnet_dump *d)
220 {
221 if (d->tail)
222 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
223
224 if (d->compat_tc_stats)
225 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
226 sizeof(d->tc_stats)) < 0)
227 return -1;
228
229 if (d->compat_xstats && d->xstats) {
230 if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
231 d->xstats_len) < 0)
232 return -1;
233 }
234
235 spin_unlock_bh(d->lock);
236 return 0;
237 }
238
239
240 EXPORT_SYMBOL(gnet_stats_start_copy);
241 EXPORT_SYMBOL(gnet_stats_start_copy_compat);
242 EXPORT_SYMBOL(gnet_stats_copy_basic);
243 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
244 EXPORT_SYMBOL(gnet_stats_copy_queue);
245 EXPORT_SYMBOL(gnet_stats_copy_app);
246 EXPORT_SYMBOL(gnet_stats_finish_copy);
247
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