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/* $OpenBSD: cache.c,v 1.8 2019/01/17 05:56:29 tedu Exp $ */
/*
* Copyright (c) 2001, 2007 Can Erkin Acar <canacar@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/tcp_fsm.h>
#ifdef TEST_COMPAT
#include "pfvarmux.h"
#else
#include <net/pfvar.h>
#endif
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <assert.h>
#include "cache.h"
/* prototypes */
void update_state(struct sc_ent *, struct pfsync_state *, double);
struct sc_ent *cache_state(struct pfsync_state *);
static __inline int sc_cmp(struct sc_ent *s1, struct sc_ent *s2);
/* initialize the tree and queue */
RB_HEAD(sc_tree, sc_ent) sctree;
TAILQ_HEAD(sc_queue, sc_ent) scq1, scq2, scq_free;
RB_GENERATE(sc_tree, sc_ent, tlink, sc_cmp)
struct sc_queue *scq_act = NULL;
struct sc_queue *scq_exp = NULL;
int cache_max = 0;
int cache_size = 0;
struct sc_ent *sc_store = NULL;
/* preallocate the cache and insert into the 'free' queue */
int
cache_init(int max)
{
int n;
static int initialized = 0;
if (max < 0 || initialized)
return (1);
if (max == 0) {
sc_store = NULL;
} else {
sc_store = reallocarray(NULL, max, sizeof(struct sc_ent));
if (sc_store == NULL)
return (1);
}
RB_INIT(&sctree);
TAILQ_INIT(&scq1);
TAILQ_INIT(&scq2);
TAILQ_INIT(&scq_free);
scq_act = &scq1;
scq_exp = &scq2;
for (n = 0; n < max; n++)
TAILQ_INSERT_HEAD(&scq_free, sc_store + n, qlink);
cache_size = cache_max = max;
initialized++;
return (0);
}
void
update_state(struct sc_ent *prev, struct pfsync_state *new, double rate)
{
assert (prev != NULL && new != NULL);
prev->t = time(NULL);
prev->rate = rate;
prev->bytes = COUNTER(new->bytes[0]) + COUNTER(new->bytes[1]);
if (prev->peak < rate)
prev->peak = rate;
}
void
add_state(struct pfsync_state *st)
{
struct sc_ent *ent;
assert(st != NULL);
if (cache_max == 0)
return;
if (TAILQ_EMPTY(&scq_free))
return;
ent = TAILQ_FIRST(&scq_free);
TAILQ_REMOVE(&scq_free, ent, qlink);
cache_size--;
ent->id = st->id;
ent->creatorid = st->creatorid;
ent->bytes = COUNTER(st->bytes[0]) + COUNTER(st->bytes[1]);
ent->peak = 0;
ent->rate = 0;
ent->t = 0;
RB_INSERT(sc_tree, &sctree, ent);
TAILQ_INSERT_HEAD(scq_act, ent, qlink);
}
/* must be called only once for each state before cache_endupdate */
struct sc_ent *
cache_state(struct pfsync_state *st)
{
struct sc_ent ent, *old;
double sd, td, r;
if (cache_max == 0)
return (NULL);
ent.id = st->id;
ent.creatorid = st->creatorid;
old = RB_FIND(sc_tree, &sctree, &ent);
if (old == NULL) {
add_state(st);
return (NULL);
}
if (COUNTER(st->bytes[0]) + COUNTER(st->bytes[1]) < old->bytes)
return (NULL);
sd = COUNTER(st->bytes[0]) + COUNTER(st->bytes[1]) - old->bytes;
td = time(NULL) - old->t;
if (td > 0) {
r = sd/td;
update_state(old, st, r);
}
/* move to active queue */
TAILQ_REMOVE(scq_exp, old, qlink);
TAILQ_INSERT_HEAD(scq_act, old, qlink);
return (old);
}
/* remove the states that are not updated in this cycle */
void
cache_endupdate(void)
{
struct sc_queue *tmp;
struct sc_ent *ent;
while (! TAILQ_EMPTY(scq_exp)) {
ent = TAILQ_FIRST(scq_exp);
TAILQ_REMOVE(scq_exp, ent, qlink);
RB_REMOVE(sc_tree, &sctree, ent);
TAILQ_INSERT_HEAD(&scq_free, ent, qlink);
cache_size++;
}
tmp = scq_act;
scq_act = scq_exp;
scq_exp = tmp;
}
static __inline int
sc_cmp(struct sc_ent *a, struct sc_ent *b)
{
if (a->id > b->id)
return (1);
if (a->id < b->id)
return (-1);
if (a->creatorid > b->creatorid)
return (1);
if (a->creatorid < b->creatorid)
return (-1);
return (0);
}
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