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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 | { | |
1e90474c | 30 | NLA_PUT(d->skb, type, size, buf); |
1da177e4 LT |
31 | return 0; |
32 | ||
1e90474c | 33 | nla_put_failure: |
1da177e4 LT |
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) | |
9a429c49 | 59 | __acquires(lock) |
1da177e4 LT |
60 | { |
61 | memset(d, 0, sizeof(*d)); | |
4ec93edb | 62 | |
1da177e4 LT |
63 | spin_lock_bh(lock); |
64 | d->lock = lock; | |
65 | if (type) | |
1e90474c | 66 | d->tail = (struct nlattr *)skb_tail_pointer(skb); |
1da177e4 LT |
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 *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 | */ | |
133 | int | |
134 | gnet_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 | */ | |
158 | int | |
159 | gnet_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 | */ | |
187 | int | |
188 | gnet_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 | */ | |
213 | int | |
214 | gnet_stats_finish_copy(struct gnet_dump *d) | |
215 | { | |
216 | if (d->tail) | |
1e90474c | 217 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
1da177e4 LT |
218 | |
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 | ||
235 | EXPORT_SYMBOL(gnet_stats_start_copy); | |
236 | EXPORT_SYMBOL(gnet_stats_start_copy_compat); | |
237 | EXPORT_SYMBOL(gnet_stats_copy_basic); | |
238 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); | |
239 | EXPORT_SYMBOL(gnet_stats_copy_queue); | |
240 | EXPORT_SYMBOL(gnet_stats_copy_app); | |
241 | EXPORT_SYMBOL(gnet_stats_finish_copy); |