Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1e90474c | 23 | #include <net/netlink.h> |
1da177e4 LT |
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 | { | |
14ad6647 DM |
30 | if (nla_put(d->skb, type, size, buf)) |
31 | goto nla_put_failure; | |
1da177e4 LT |
32 | return 0; |
33 | ||
1e90474c | 34 | nla_put_failure: |
54c7f897 IG |
35 | kfree(d->xstats); |
36 | d->xstats = NULL; | |
37 | d->xstats_len = 0; | |
1da177e4 LT |
38 | spin_unlock_bh(d->lock); |
39 | return -1; | |
40 | } | |
41 | ||
42 | /** | |
43 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode | |
44 | * @skb: socket buffer to put statistics TLVs into | |
45 | * @type: TLV type for top level statistic TLV | |
46 | * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV | |
47 | * @xstats_type: TLV type for backward compatibility xstats TLV | |
48 | * @lock: statistics lock | |
49 | * @d: dumping handle | |
50 | * | |
51 | * Initializes the dumping handle, grabs the statistic lock and appends | |
52 | * an empty TLV header to the socket buffer for use a container for all | |
53 | * other statistic TLVS. | |
54 | * | |
55 | * The dumping handle is marked to be in backward compatibility mode telling | |
56 | * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. | |
57 | * | |
58 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. | |
59 | */ | |
60 | int | |
61 | gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, | |
62 | int xstats_type, spinlock_t *lock, struct gnet_dump *d) | |
9a429c49 | 63 | __acquires(lock) |
1da177e4 LT |
64 | { |
65 | memset(d, 0, sizeof(*d)); | |
4ec93edb | 66 | |
1da177e4 LT |
67 | spin_lock_bh(lock); |
68 | d->lock = lock; | |
69 | if (type) | |
1e90474c | 70 | d->tail = (struct nlattr *)skb_tail_pointer(skb); |
1da177e4 LT |
71 | d->skb = skb; |
72 | d->compat_tc_stats = tc_stats_type; | |
73 | d->compat_xstats = xstats_type; | |
74 | ||
75 | if (d->tail) | |
76 | return gnet_stats_copy(d, type, NULL, 0); | |
77 | ||
78 | return 0; | |
79 | } | |
9e34a5b5 | 80 | EXPORT_SYMBOL(gnet_stats_start_copy_compat); |
1da177e4 LT |
81 | |
82 | /** | |
83 | * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode | |
84 | * @skb: socket buffer to put statistics TLVs into | |
85 | * @type: TLV type for top level statistic TLV | |
86 | * @lock: statistics lock | |
87 | * @d: dumping handle | |
88 | * | |
89 | * Initializes the dumping handle, grabs the statistic lock and appends | |
90 | * an empty TLV header to the socket buffer for use a container for all | |
91 | * other statistic TLVS. | |
92 | * | |
93 | * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. | |
94 | */ | |
95 | int | |
96 | gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, | |
97 | struct gnet_dump *d) | |
98 | { | |
99 | return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); | |
100 | } | |
9e34a5b5 | 101 | EXPORT_SYMBOL(gnet_stats_start_copy); |
1da177e4 LT |
102 | |
103 | /** | |
104 | * gnet_stats_copy_basic - copy basic statistics into statistic TLV | |
105 | * @d: dumping handle | |
106 | * @b: basic statistics | |
107 | * | |
108 | * Appends the basic statistics to the top level TLV created by | |
109 | * gnet_stats_start_copy(). | |
110 | * | |
111 | * Returns 0 on success or -1 with the statistic lock released | |
112 | * if the room in the socket buffer was not sufficient. | |
113 | */ | |
114 | int | |
c1a8f1f1 | 115 | gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b) |
1da177e4 LT |
116 | { |
117 | if (d->compat_tc_stats) { | |
118 | d->tc_stats.bytes = b->bytes; | |
119 | d->tc_stats.packets = b->packets; | |
120 | } | |
121 | ||
c1a8f1f1 ED |
122 | if (d->tail) { |
123 | struct gnet_stats_basic sb; | |
1da177e4 | 124 | |
c1a8f1f1 ED |
125 | memset(&sb, 0, sizeof(sb)); |
126 | sb.bytes = b->bytes; | |
127 | sb.packets = b->packets; | |
128 | return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); | |
129 | } | |
1da177e4 LT |
130 | return 0; |
131 | } | |
9e34a5b5 | 132 | EXPORT_SYMBOL(gnet_stats_copy_basic); |
1da177e4 LT |
133 | |
134 | /** | |
135 | * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV | |
136 | * @d: dumping handle | |
d250a5f9 | 137 | * @b: basic statistics |
1da177e4 LT |
138 | * @r: rate estimator statistics |
139 | * | |
140 | * Appends the rate estimator statistics to the top level TLV created by | |
141 | * gnet_stats_start_copy(). | |
142 | * | |
143 | * Returns 0 on success or -1 with the statistic lock released | |
144 | * if the room in the socket buffer was not sufficient. | |
145 | */ | |
146 | int | |
d250a5f9 ED |
147 | gnet_stats_copy_rate_est(struct gnet_dump *d, |
148 | const struct gnet_stats_basic_packed *b, | |
149 | struct gnet_stats_rate_est *r) | |
1da177e4 | 150 | { |
d250a5f9 ED |
151 | if (b && !gen_estimator_active(b, r)) |
152 | return 0; | |
153 | ||
1da177e4 LT |
154 | if (d->compat_tc_stats) { |
155 | d->tc_stats.bps = r->bps; | |
156 | d->tc_stats.pps = r->pps; | |
157 | } | |
158 | ||
159 | if (d->tail) | |
160 | return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); | |
161 | ||
162 | return 0; | |
163 | } | |
9e34a5b5 | 164 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); |
1da177e4 LT |
165 | |
166 | /** | |
167 | * gnet_stats_copy_queue - copy queue statistics into statistics TLV | |
168 | * @d: dumping handle | |
169 | * @q: queue statistics | |
170 | * | |
171 | * Appends the queue statistics to the top level TLV created by | |
172 | * gnet_stats_start_copy(). | |
173 | * | |
174 | * Returns 0 on success or -1 with the statistic lock released | |
175 | * if the room in the socket buffer was not sufficient. | |
176 | */ | |
177 | int | |
178 | gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) | |
179 | { | |
180 | if (d->compat_tc_stats) { | |
181 | d->tc_stats.drops = q->drops; | |
182 | d->tc_stats.qlen = q->qlen; | |
183 | d->tc_stats.backlog = q->backlog; | |
184 | d->tc_stats.overlimits = q->overlimits; | |
185 | } | |
186 | ||
187 | if (d->tail) | |
188 | return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); | |
189 | ||
190 | return 0; | |
191 | } | |
9e34a5b5 | 192 | EXPORT_SYMBOL(gnet_stats_copy_queue); |
1da177e4 LT |
193 | |
194 | /** | |
195 | * gnet_stats_copy_app - copy application specific statistics into statistics TLV | |
196 | * @d: dumping handle | |
197 | * @st: application specific statistics data | |
198 | * @len: length of data | |
199 | * | |
200 | * Appends the application sepecific statistics to the top level TLV created by | |
201 | * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping | |
202 | * handle is in backward compatibility mode. | |
203 | * | |
204 | * Returns 0 on success or -1 with the statistic lock released | |
205 | * if the room in the socket buffer was not sufficient. | |
206 | */ | |
207 | int | |
208 | gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) | |
209 | { | |
210 | if (d->compat_xstats) { | |
54c7f897 IG |
211 | d->xstats = kmemdup(st, len, GFP_ATOMIC); |
212 | if (!d->xstats) | |
213 | goto err_out; | |
1da177e4 LT |
214 | d->xstats_len = len; |
215 | } | |
216 | ||
217 | if (d->tail) | |
218 | return gnet_stats_copy(d, TCA_STATS_APP, st, len); | |
219 | ||
220 | return 0; | |
54c7f897 IG |
221 | |
222 | err_out: | |
223 | d->xstats_len = 0; | |
224 | spin_unlock_bh(d->lock); | |
225 | return -1; | |
1da177e4 | 226 | } |
9e34a5b5 | 227 | EXPORT_SYMBOL(gnet_stats_copy_app); |
1da177e4 LT |
228 | |
229 | /** | |
230 | * gnet_stats_finish_copy - finish dumping procedure | |
231 | * @d: dumping handle | |
232 | * | |
233 | * Corrects the length of the top level TLV to include all TLVs added | |
234 | * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs | |
235 | * if gnet_stats_start_copy_compat() was used and releases the statistics | |
236 | * lock. | |
237 | * | |
238 | * Returns 0 on success or -1 with the statistic lock released | |
239 | * if the room in the socket buffer was not sufficient. | |
240 | */ | |
241 | int | |
242 | gnet_stats_finish_copy(struct gnet_dump *d) | |
243 | { | |
244 | if (d->tail) | |
1e90474c | 245 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
1da177e4 LT |
246 | |
247 | if (d->compat_tc_stats) | |
248 | if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, | |
249 | sizeof(d->tc_stats)) < 0) | |
250 | return -1; | |
251 | ||
252 | if (d->compat_xstats && d->xstats) { | |
253 | if (gnet_stats_copy(d, d->compat_xstats, d->xstats, | |
254 | d->xstats_len) < 0) | |
255 | return -1; | |
256 | } | |
257 | ||
54c7f897 IG |
258 | kfree(d->xstats); |
259 | d->xstats = NULL; | |
260 | d->xstats_len = 0; | |
1da177e4 LT |
261 | spin_unlock_bh(d->lock); |
262 | return 0; | |
263 | } | |
1da177e4 | 264 | EXPORT_SYMBOL(gnet_stats_finish_copy); |