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        NLA_PUT(d->skb, type, size, buf);
  31        return 0;
  32
  33nla_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 */
  56int
  57gnet_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 */
  90int
  91gnet_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 */
 108int
 109gnet_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 */
 133int
 134gnet_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 */
 158int
 159gnet_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 */
 187int
 188gnet_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 */
 213int
 214gnet_stats_finish_copy(struct gnet_dump *d)
 215{
 216        if (d->tail)
 217                d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
 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
 235EXPORT_SYMBOL(gnet_stats_start_copy);
 236EXPORT_SYMBOL(gnet_stats_start_copy_compat);
 237EXPORT_SYMBOL(gnet_stats_copy_basic);
 238EXPORT_SYMBOL(gnet_stats_copy_rate_est);
 239EXPORT_SYMBOL(gnet_stats_copy_queue);
 240EXPORT_SYMBOL(gnet_stats_copy_app);
 241EXPORT_SYMBOL(gnet_stats_finish_copy);
 242