linux/net/core/gen_stats.c
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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
  27static inline int
  28gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
  29{
  30        if (nla_put(d->skb, type, size, buf))
  31                goto nla_put_failure;
  32        return 0;
  33
  34nla_put_failure:
  35        spin_unlock_bh(d->lock);
  36        return -1;
  37}
  38
  39/**
  40 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
  41 * @skb: socket buffer to put statistics TLVs into
  42 * @type: TLV type for top level statistic TLV
  43 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
  44 * @xstats_type: TLV type for backward compatibility xstats TLV
  45 * @lock: statistics lock
  46 * @d: dumping handle
  47 *
  48 * Initializes the dumping handle, grabs the statistic lock and appends
  49 * an empty TLV header to the socket buffer for use a container for all
  50 * other statistic TLVS.
  51 *
  52 * The dumping handle is marked to be in backward compatibility mode telling
  53 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
  54 *
  55 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
  56 */
  57int
  58gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
  59        int xstats_type, spinlock_t *lock, struct gnet_dump *d)
  60        __acquires(lock)
  61{
  62        memset(d, 0, sizeof(*d));
  63
  64        spin_lock_bh(lock);
  65        d->lock = lock;
  66        if (type)
  67                d->tail = (struct nlattr *)skb_tail_pointer(skb);
  68        d->skb = skb;
  69        d->compat_tc_stats = tc_stats_type;
  70        d->compat_xstats = xstats_type;
  71
  72        if (d->tail)
  73                return gnet_stats_copy(d, type, NULL, 0);
  74
  75        return 0;
  76}
  77EXPORT_SYMBOL(gnet_stats_start_copy_compat);
  78
  79/**
  80 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
  81 * @skb: socket buffer to put statistics TLVs into
  82 * @type: TLV type for top level statistic TLV
  83 * @lock: statistics lock
  84 * @d: dumping handle
  85 *
  86 * Initializes the dumping handle, grabs the statistic lock and appends
  87 * an empty TLV header to the socket buffer for use a container for all
  88 * other statistic TLVS.
  89 *
  90 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
  91 */
  92int
  93gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
  94        struct gnet_dump *d)
  95{
  96        return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
  97}
  98EXPORT_SYMBOL(gnet_stats_start_copy);
  99
 100/**
 101 * gnet_stats_copy_basic - copy basic statistics into statistic TLV
 102 * @d: dumping handle
 103 * @b: basic statistics
 104 *
 105 * Appends the basic statistics to the top level TLV created by
 106 * gnet_stats_start_copy().
 107 *
 108 * Returns 0 on success or -1 with the statistic lock released
 109 * if the room in the socket buffer was not sufficient.
 110 */
 111int
 112gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b)
 113{
 114        if (d->compat_tc_stats) {
 115                d->tc_stats.bytes = b->bytes;
 116                d->tc_stats.packets = b->packets;
 117        }
 118
 119        if (d->tail) {
 120                struct gnet_stats_basic sb;
 121
 122                memset(&sb, 0, sizeof(sb));
 123                sb.bytes = b->bytes;
 124                sb.packets = b->packets;
 125                return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
 126        }
 127        return 0;
 128}
 129EXPORT_SYMBOL(gnet_stats_copy_basic);
 130
 131/**
 132 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
 133 * @d: dumping handle
 134 * @b: basic statistics
 135 * @r: rate estimator statistics
 136 *
 137 * Appends the rate estimator statistics to the top level TLV created by
 138 * gnet_stats_start_copy().
 139 *
 140 * Returns 0 on success or -1 with the statistic lock released
 141 * if the room in the socket buffer was not sufficient.
 142 */
 143int
 144gnet_stats_copy_rate_est(struct gnet_dump *d,
 145                         const struct gnet_stats_basic_packed *b,
 146                         struct gnet_stats_rate_est *r)
 147{
 148        if (b && !gen_estimator_active(b, r))
 149                return 0;
 150
 151        if (d->compat_tc_stats) {
 152                d->tc_stats.bps = r->bps;
 153                d->tc_stats.pps = r->pps;
 154        }
 155
 156        if (d->tail)
 157                return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r));
 158
 159        return 0;
 160}
 161EXPORT_SYMBOL(gnet_stats_copy_rate_est);
 162
 163/**
 164 * gnet_stats_copy_queue - copy queue statistics into statistics TLV
 165 * @d: dumping handle
 166 * @q: queue statistics
 167 *
 168 * Appends the queue statistics to the top level TLV created by
 169 * gnet_stats_start_copy().
 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 */
 174int
 175gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q)
 176{
 177        if (d->compat_tc_stats) {
 178                d->tc_stats.drops = q->drops;
 179                d->tc_stats.qlen = q->qlen;
 180                d->tc_stats.backlog = q->backlog;
 181                d->tc_stats.overlimits = q->overlimits;
 182        }
 183
 184        if (d->tail)
 185                return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
 186
 187        return 0;
 188}
 189EXPORT_SYMBOL(gnet_stats_copy_queue);
 190
 191/**
 192 * gnet_stats_copy_app - copy application specific statistics into statistics TLV
 193 * @d: dumping handle
 194 * @st: application specific statistics data
 195 * @len: length of data
 196 *
 197 * Appends the application sepecific statistics to the top level TLV created by
 198 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
 199 * handle is in backward compatibility mode.
 200 *
 201 * Returns 0 on success or -1 with the statistic lock released
 202 * if the room in the socket buffer was not sufficient.
 203 */
 204int
 205gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
 206{
 207        if (d->compat_xstats) {
 208                d->xstats = st;
 209                d->xstats_len = len;
 210        }
 211
 212        if (d->tail)
 213                return gnet_stats_copy(d, TCA_STATS_APP, st, len);
 214
 215        return 0;
 216}
 217EXPORT_SYMBOL(gnet_stats_copy_app);
 218
 219/**
 220 * gnet_stats_finish_copy - finish dumping procedure
 221 * @d: dumping handle
 222 *
 223 * Corrects the length of the top level TLV to include all TLVs added
 224 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
 225 * if gnet_stats_start_copy_compat() was used and releases the statistics
 226 * lock.
 227 *
 228 * Returns 0 on success or -1 with the statistic lock released
 229 * if the room in the socket buffer was not sufficient.
 230 */
 231int
 232gnet_stats_finish_copy(struct gnet_dump *d)
 233{
 234        if (d->tail)
 235                d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
 236
 237        if (d->compat_tc_stats)
 238                if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
 239                        sizeof(d->tc_stats)) < 0)
 240                        return -1;
 241
 242        if (d->compat_xstats && d->xstats) {
 243                if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
 244                        d->xstats_len) < 0)
 245                        return -1;
 246        }
 247
 248        spin_unlock_bh(d->lock);
 249        return 0;
 250}
 251EXPORT_SYMBOL(gnet_stats_finish_copy);
 252
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