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/*
* inet fragments management
*
* 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: Pavel Emelyanov <xemul@openvz.org>
* Started as consolidation of ipv4/ip_fragment.c,
* ipv6/reassembly. and ipv6 nf conntrack reassembly
*/
#ifndef HAVE_CORRECT_MRU_HANDLING
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/inet_frag.h>
#include <net/inet_ecn.h>
#ifdef HAVE_INET_FRAGS_WITH_FRAGS_WORK
static bool inet_fragq_should_evict(const struct inet_frag_queue *q)
{
return q->net->low_thresh == 0 ||
frag_mem_limit(q->net) >= q->net->low_thresh;
}
static unsigned int
inet_evict_bucket(struct inet_frags *f, struct inet_frag_bucket *hb)
{
struct inet_frag_queue *fq;
struct hlist_node *n;
unsigned int evicted = 0;
HLIST_HEAD(expired);
spin_lock(&hb->chain_lock);
hlist_for_each_entry_safe(fq, n, &hb->chain, list) {
if (!inet_fragq_should_evict(fq))
continue;
if (!del_timer(&fq->timer))
continue;
#ifdef HAVE_INET_FRAG_QUEUE_WITH_LIST_EVICTOR
hlist_add_head(&fq->list_evictor, &expired);
#else
hlist_del(&fq->list);
hlist_add_head(&fq->list, &expired);
#endif
++evicted;
}
spin_unlock(&hb->chain_lock);
#ifdef HAVE_INET_FRAG_QUEUE_WITH_LIST_EVICTOR
hlist_for_each_entry_safe(fq, n, &expired, list_evictor)
#else
hlist_for_each_entry_safe(fq, n, &expired, list)
#endif
f->frag_expire((unsigned long) fq);
return evicted;
}
void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f)
{
int thresh = nf->low_thresh;
unsigned int seq;
int i;
nf->low_thresh = 0;
evict_again:
local_bh_disable();
seq = read_seqbegin(&f->rnd_seqlock);
for (i = 0; i < INETFRAGS_HASHSZ ; i++)
inet_evict_bucket(f, &f->hash[i]);
local_bh_enable();
cond_resched();
if (read_seqretry(&f->rnd_seqlock, seq) ||
percpu_counter_sum(&nf->mem))
goto evict_again;
nf->low_thresh = thresh;
}
#else /* HAVE_INET_FRAGS_WITH_FRAGS_WORK */
void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f)
{
int thresh = nf->low_thresh;
nf->low_thresh = 0;
local_bh_disable();
inet_frag_evictor(nf, f, true);
local_bh_enable();
nf->low_thresh = thresh;
}
#endif /* HAVE_INET_FRAGS_WITH_FRAGS_WORK */
#endif /* !HAVE_CORRECT_MRU_HANDLING */
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