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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 | * @b: basic statistics |
131 | * @r: rate estimator statistics |
132 | * |
133 | * Appends the rate estimator statistics to the top level TLV created by |
134 | * gnet_stats_start_copy(). |
135 | * |
136 | * Returns 0 on success or -1 with the statistic lock released |
137 | * if the room in the socket buffer was not sufficient. |
138 | */ |
139 | int |
140 | gnet_stats_copy_rate_est(struct gnet_dump *d, |
141 | const struct gnet_stats_basic_packed *b, |
142 | struct gnet_stats_rate_est *r) |
143 | { |
144 | if (b && !gen_estimator_active(b, r)) |
145 | return 0; |
146 | |
147 | if (d->compat_tc_stats) { |
148 | d->tc_stats.bps = r->bps; |
149 | d->tc_stats.pps = r->pps; |
150 | } |
151 | |
152 | if (d->tail) |
153 | return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); |
154 | |
155 | return 0; |
156 | } |
157 | |
158 | /** |
159 | * gnet_stats_copy_queue - copy queue statistics into statistics TLV |
160 | * @d: dumping handle |
161 | * @q: queue statistics |
162 | * |
163 | * Appends the queue statistics to the top level TLV created by |
164 | * gnet_stats_start_copy(). |
165 | * |
166 | * Returns 0 on success or -1 with the statistic lock released |
167 | * if the room in the socket buffer was not sufficient. |
168 | */ |
169 | int |
170 | gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) |
171 | { |
172 | if (d->compat_tc_stats) { |
173 | d->tc_stats.drops = q->drops; |
174 | d->tc_stats.qlen = q->qlen; |
175 | d->tc_stats.backlog = q->backlog; |
176 | d->tc_stats.overlimits = q->overlimits; |
177 | } |
178 | |
179 | if (d->tail) |
180 | return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); |
181 | |
182 | return 0; |
183 | } |
184 | |
185 | /** |
186 | * gnet_stats_copy_app - copy application specific statistics into statistics TLV |
187 | * @d: dumping handle |
188 | * @st: application specific statistics data |
189 | * @len: length of data |
190 | * |
191 | * Appends the application sepecific statistics to the top level TLV created by |
192 | * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping |
193 | * handle is in backward compatibility mode. |
194 | * |
195 | * Returns 0 on success or -1 with the statistic lock released |
196 | * if the room in the socket buffer was not sufficient. |
197 | */ |
198 | int |
199 | gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) |
200 | { |
201 | if (d->compat_xstats) { |
202 | d->xstats = st; |
203 | d->xstats_len = len; |
204 | } |
205 | |
206 | if (d->tail) |
207 | return gnet_stats_copy(d, TCA_STATS_APP, st, len); |
208 | |
209 | return 0; |
210 | } |
211 | |
212 | /** |
213 | * gnet_stats_finish_copy - finish dumping procedure |
214 | * @d: dumping handle |
215 | * |
216 | * Corrects the length of the top level TLV to include all TLVs added |
217 | * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs |
218 | * if gnet_stats_start_copy_compat() was used and releases the statistics |
219 | * lock. |
220 | * |
221 | * Returns 0 on success or -1 with the statistic lock released |
222 | * if the room in the socket buffer was not sufficient. |
223 | */ |
224 | int |
225 | gnet_stats_finish_copy(struct gnet_dump *d) |
226 | { |
227 | if (d->tail) |
228 | d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; |
229 | |
230 | if (d->compat_tc_stats) |
231 | if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, |
232 | sizeof(d->tc_stats)) < 0) |
233 | return -1; |
234 | |
235 | if (d->compat_xstats && d->xstats) { |
236 | if (gnet_stats_copy(d, d->compat_xstats, d->xstats, |
237 | d->xstats_len) < 0) |
238 | return -1; |
239 | } |
240 | |
241 | spin_unlock_bh(d->lock); |
242 | return 0; |
243 | } |
244 | |
245 | |
246 | EXPORT_SYMBOL(gnet_stats_start_copy); |
247 | EXPORT_SYMBOL(gnet_stats_start_copy_compat); |
248 | EXPORT_SYMBOL(gnet_stats_copy_basic); |
249 | EXPORT_SYMBOL(gnet_stats_copy_rate_est); |
250 | EXPORT_SYMBOL(gnet_stats_copy_queue); |
251 | EXPORT_SYMBOL(gnet_stats_copy_app); |
252 | EXPORT_SYMBOL(gnet_stats_finish_copy); |
253 |
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