mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 18:26:39 +07:00
54db0cc2ba
add struct net as a parameter of inet_getpeer_v[4,6], use net to replace &init_net. and modify some places to provide net for inet_getpeer_v[4,6] Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
287 lines
6.4 KiB
C
287 lines
6.4 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#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/inet_frag.h>
|
|
|
|
static void inet_frag_secret_rebuild(unsigned long dummy)
|
|
{
|
|
struct inet_frags *f = (struct inet_frags *)dummy;
|
|
unsigned long now = jiffies;
|
|
int i;
|
|
|
|
write_lock(&f->lock);
|
|
get_random_bytes(&f->rnd, sizeof(u32));
|
|
for (i = 0; i < INETFRAGS_HASHSZ; i++) {
|
|
struct inet_frag_queue *q;
|
|
struct hlist_node *p, *n;
|
|
|
|
hlist_for_each_entry_safe(q, p, n, &f->hash[i], list) {
|
|
unsigned int hval = f->hashfn(q);
|
|
|
|
if (hval != i) {
|
|
hlist_del(&q->list);
|
|
|
|
/* Relink to new hash chain. */
|
|
hlist_add_head(&q->list, &f->hash[hval]);
|
|
}
|
|
}
|
|
}
|
|
write_unlock(&f->lock);
|
|
|
|
mod_timer(&f->secret_timer, now + f->secret_interval);
|
|
}
|
|
|
|
void inet_frags_init(struct inet_frags *f)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < INETFRAGS_HASHSZ; i++)
|
|
INIT_HLIST_HEAD(&f->hash[i]);
|
|
|
|
rwlock_init(&f->lock);
|
|
|
|
f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
|
|
(jiffies ^ (jiffies >> 6)));
|
|
|
|
setup_timer(&f->secret_timer, inet_frag_secret_rebuild,
|
|
(unsigned long)f);
|
|
f->secret_timer.expires = jiffies + f->secret_interval;
|
|
add_timer(&f->secret_timer);
|
|
}
|
|
EXPORT_SYMBOL(inet_frags_init);
|
|
|
|
void inet_frags_init_net(struct netns_frags *nf)
|
|
{
|
|
nf->nqueues = 0;
|
|
atomic_set(&nf->mem, 0);
|
|
INIT_LIST_HEAD(&nf->lru_list);
|
|
}
|
|
EXPORT_SYMBOL(inet_frags_init_net);
|
|
|
|
void inet_frags_fini(struct inet_frags *f)
|
|
{
|
|
del_timer(&f->secret_timer);
|
|
}
|
|
EXPORT_SYMBOL(inet_frags_fini);
|
|
|
|
void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f)
|
|
{
|
|
nf->low_thresh = 0;
|
|
|
|
local_bh_disable();
|
|
inet_frag_evictor(nf, f);
|
|
local_bh_enable();
|
|
}
|
|
EXPORT_SYMBOL(inet_frags_exit_net);
|
|
|
|
static inline void fq_unlink(struct inet_frag_queue *fq, struct inet_frags *f)
|
|
{
|
|
write_lock(&f->lock);
|
|
hlist_del(&fq->list);
|
|
list_del(&fq->lru_list);
|
|
fq->net->nqueues--;
|
|
write_unlock(&f->lock);
|
|
}
|
|
|
|
void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
|
|
{
|
|
if (del_timer(&fq->timer))
|
|
atomic_dec(&fq->refcnt);
|
|
|
|
if (!(fq->last_in & INET_FRAG_COMPLETE)) {
|
|
fq_unlink(fq, f);
|
|
atomic_dec(&fq->refcnt);
|
|
fq->last_in |= INET_FRAG_COMPLETE;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(inet_frag_kill);
|
|
|
|
static inline void frag_kfree_skb(struct netns_frags *nf, struct inet_frags *f,
|
|
struct sk_buff *skb, int *work)
|
|
{
|
|
if (work)
|
|
*work -= skb->truesize;
|
|
|
|
atomic_sub(skb->truesize, &nf->mem);
|
|
if (f->skb_free)
|
|
f->skb_free(skb);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
|
|
int *work)
|
|
{
|
|
struct sk_buff *fp;
|
|
struct netns_frags *nf;
|
|
|
|
WARN_ON(!(q->last_in & INET_FRAG_COMPLETE));
|
|
WARN_ON(del_timer(&q->timer) != 0);
|
|
|
|
/* Release all fragment data. */
|
|
fp = q->fragments;
|
|
nf = q->net;
|
|
while (fp) {
|
|
struct sk_buff *xp = fp->next;
|
|
|
|
frag_kfree_skb(nf, f, fp, work);
|
|
fp = xp;
|
|
}
|
|
|
|
if (work)
|
|
*work -= f->qsize;
|
|
atomic_sub(f->qsize, &nf->mem);
|
|
|
|
if (f->destructor)
|
|
f->destructor(q);
|
|
kfree(q);
|
|
|
|
}
|
|
EXPORT_SYMBOL(inet_frag_destroy);
|
|
|
|
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f)
|
|
{
|
|
struct inet_frag_queue *q;
|
|
int work, evicted = 0;
|
|
|
|
work = atomic_read(&nf->mem) - nf->low_thresh;
|
|
while (work > 0) {
|
|
read_lock(&f->lock);
|
|
if (list_empty(&nf->lru_list)) {
|
|
read_unlock(&f->lock);
|
|
break;
|
|
}
|
|
|
|
q = list_first_entry(&nf->lru_list,
|
|
struct inet_frag_queue, lru_list);
|
|
atomic_inc(&q->refcnt);
|
|
read_unlock(&f->lock);
|
|
|
|
spin_lock(&q->lock);
|
|
if (!(q->last_in & INET_FRAG_COMPLETE))
|
|
inet_frag_kill(q, f);
|
|
spin_unlock(&q->lock);
|
|
|
|
if (atomic_dec_and_test(&q->refcnt))
|
|
inet_frag_destroy(q, f, &work);
|
|
evicted++;
|
|
}
|
|
|
|
return evicted;
|
|
}
|
|
EXPORT_SYMBOL(inet_frag_evictor);
|
|
|
|
static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
|
|
struct inet_frag_queue *qp_in, struct inet_frags *f,
|
|
void *arg)
|
|
{
|
|
struct inet_frag_queue *qp;
|
|
#ifdef CONFIG_SMP
|
|
struct hlist_node *n;
|
|
#endif
|
|
unsigned int hash;
|
|
|
|
write_lock(&f->lock);
|
|
/*
|
|
* While we stayed w/o the lock other CPU could update
|
|
* the rnd seed, so we need to re-calculate the hash
|
|
* chain. Fortunatelly the qp_in can be used to get one.
|
|
*/
|
|
hash = f->hashfn(qp_in);
|
|
#ifdef CONFIG_SMP
|
|
/* With SMP race we have to recheck hash table, because
|
|
* such entry could be created on other cpu, while we
|
|
* promoted read lock to write lock.
|
|
*/
|
|
hlist_for_each_entry(qp, n, &f->hash[hash], list) {
|
|
if (qp->net == nf && f->match(qp, arg)) {
|
|
atomic_inc(&qp->refcnt);
|
|
write_unlock(&f->lock);
|
|
qp_in->last_in |= INET_FRAG_COMPLETE;
|
|
inet_frag_put(qp_in, f);
|
|
return qp;
|
|
}
|
|
}
|
|
#endif
|
|
qp = qp_in;
|
|
if (!mod_timer(&qp->timer, jiffies + nf->timeout))
|
|
atomic_inc(&qp->refcnt);
|
|
|
|
atomic_inc(&qp->refcnt);
|
|
hlist_add_head(&qp->list, &f->hash[hash]);
|
|
list_add_tail(&qp->lru_list, &nf->lru_list);
|
|
nf->nqueues++;
|
|
write_unlock(&f->lock);
|
|
return qp;
|
|
}
|
|
|
|
static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
|
|
struct inet_frags *f, void *arg)
|
|
{
|
|
struct inet_frag_queue *q;
|
|
|
|
q = kzalloc(f->qsize, GFP_ATOMIC);
|
|
if (q == NULL)
|
|
return NULL;
|
|
|
|
q->net = nf;
|
|
f->constructor(q, arg);
|
|
atomic_add(f->qsize, &nf->mem);
|
|
setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
|
|
spin_lock_init(&q->lock);
|
|
atomic_set(&q->refcnt, 1);
|
|
|
|
return q;
|
|
}
|
|
|
|
static struct inet_frag_queue *inet_frag_create(struct netns_frags *nf,
|
|
struct inet_frags *f, void *arg)
|
|
{
|
|
struct inet_frag_queue *q;
|
|
|
|
q = inet_frag_alloc(nf, f, arg);
|
|
if (q == NULL)
|
|
return NULL;
|
|
|
|
return inet_frag_intern(nf, q, f, arg);
|
|
}
|
|
|
|
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
|
|
struct inet_frags *f, void *key, unsigned int hash)
|
|
__releases(&f->lock)
|
|
{
|
|
struct inet_frag_queue *q;
|
|
struct hlist_node *n;
|
|
|
|
hlist_for_each_entry(q, n, &f->hash[hash], list) {
|
|
if (q->net == nf && f->match(q, key)) {
|
|
atomic_inc(&q->refcnt);
|
|
read_unlock(&f->lock);
|
|
return q;
|
|
}
|
|
}
|
|
read_unlock(&f->lock);
|
|
|
|
return inet_frag_create(nf, f, key);
|
|
}
|
|
EXPORT_SYMBOL(inet_frag_find);
|