/* * net/core/gen_stats.c * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Authors: Thomas Graf <tgraf@suug.ch> * Jamal Hadi Salim * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * See Documentation/networking/gen_stats.txt */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/socket.h> #include <linux/rtnetlink.h> #include <linux/gen_stats.h> #include <net/netlink.h> #include <net/gen_stats.h> static inline int gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size) { if (nla_put(d->skb, type, size, buf)) goto nla_put_failure; return 0; nla_put_failure: spin_unlock_bh(d->lock); return -1; } /** * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode * @skb: socket buffer to put statistics TLVs into * @type: TLV type for top level statistic TLV * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV * @xstats_type: TLV type for backward compatibility xstats TLV * @lock: statistics lock * @d: dumping handle * * Initializes the dumping handle, grabs the statistic lock and appends * an empty TLV header to the socket buffer for use a container for all * other statistic TLVS. * * The dumping handle is marked to be in backward compatibility mode telling * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. * * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. */ int gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, int xstats_type, spinlock_t *lock, struct gnet_dump *d) __acquires(lock) { memset(d, 0, sizeof(*d)); spin_lock_bh(lock); d->lock = lock; if (type) d->tail = (struct nlattr *)skb_tail_pointer(skb); d->skb = skb; d->compat_tc_stats = tc_stats_type; d->compat_xstats = xstats_type; if (d->tail) return gnet_stats_copy(d, type, NULL, 0); return 0; } EXPORT_SYMBOL(gnet_stats_start_copy_compat); /** * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode * @skb: socket buffer to put statistics TLVs into * @type: TLV type for top level statistic TLV * @lock: statistics lock * @d: dumping handle * * Initializes the dumping handle, grabs the statistic lock and appends * an empty TLV header to the socket buffer for use a container for all * other statistic TLVS. * * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. */ int gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, struct gnet_dump *d) { return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); } EXPORT_SYMBOL(gnet_stats_start_copy); /** * gnet_stats_copy_basic - copy basic statistics into statistic TLV * @d: dumping handle * @b: basic statistics * * Appends the basic statistics to the top level TLV created by * gnet_stats_start_copy(). * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */ int gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b) { if (d->compat_tc_stats) { d->tc_stats.bytes = b->bytes; d->tc_stats.packets = b->packets; } if (d->tail) { struct gnet_stats_basic sb; memset(&sb, 0, sizeof(sb)); sb.bytes = b->bytes; sb.packets = b->packets; return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); } return 0; } EXPORT_SYMBOL(gnet_stats_copy_basic); /** * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV * @d: dumping handle * @b: basic statistics * @r: rate estimator statistics * * Appends the rate estimator statistics to the top level TLV created by * gnet_stats_start_copy(). * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */ int gnet_stats_copy_rate_est(struct gnet_dump *d, const struct gnet_stats_basic_packed *b, struct gnet_stats_rate_est64 *r) { struct gnet_stats_rate_est est; int res; if (b && !gen_estimator_active(b, r)) return 0; est.bps = min_t(u64, UINT_MAX, r->bps); /* we have some time before reaching 2^32 packets per second */ est.pps = r->pps; if (d->compat_tc_stats) { d->tc_stats.bps = est.bps; d->tc_stats.pps = est.pps; } if (d->tail) { res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est)); if (res < 0 || est.bps == r->bps) return res; /* emit 64bit stats only if needed */ return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r)); } return 0; } EXPORT_SYMBOL(gnet_stats_copy_rate_est); /** * gnet_stats_copy_queue - copy queue statistics into statistics TLV * @d: dumping handle * @q: queue statistics * * Appends the queue statistics to the top level TLV created by * gnet_stats_start_copy(). * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */ int gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) { if (d->compat_tc_stats) { d->tc_stats.drops = q->drops; d->tc_stats.qlen = q->qlen; d->tc_stats.backlog = q->backlog; d->tc_stats.overlimits = q->overlimits; } if (d->tail) return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); return 0; } EXPORT_SYMBOL(gnet_stats_copy_queue); /** * gnet_stats_copy_app - copy application specific statistics into statistics TLV * @d: dumping handle * @st: application specific statistics data * @len: length of data * * Appends the application sepecific statistics to the top level TLV created by * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping * handle is in backward compatibility mode. * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */ int gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) { if (d->compat_xstats) { d->xstats = st; d->xstats_len = len; } if (d->tail) return gnet_stats_copy(d, TCA_STATS_APP, st, len); return 0; } EXPORT_SYMBOL(gnet_stats_copy_app); /** * gnet_stats_finish_copy - finish dumping procedure * @d: dumping handle * * Corrects the length of the top level TLV to include all TLVs added * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs * if gnet_stats_start_copy_compat() was used and releases the statistics * lock. * * Returns 0 on success or -1 with the statistic lock released * if the room in the socket buffer was not sufficient. */ int gnet_stats_finish_copy(struct gnet_dump *d) { if (d->tail) d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; if (d->compat_tc_stats) if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, sizeof(d->tc_stats)) < 0) return -1; if (d->compat_xstats && d->xstats) { if (gnet_stats_copy(d, d->compat_xstats, d->xstats, d->xstats_len) < 0) return -1; } spin_unlock_bh(d->lock); return 0; } EXPORT_SYMBOL(gnet_stats_finish_copy);