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ipv6: unify fragment thresh handling code 

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Michal Kubeček <mkubecek@suse.cz>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amerigo Wang 2012-09-18 16:50:11 +00:00 committed by David S. Miller
parent d4915c087f
commit 6b102865e7
5 changed files with 18 additions and 22 deletions
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2
include/net/inet_frag.h
View File

@ -61,7 +61,7 @@ void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
void inet_frag_destroy(struct inet_frag_queue *q,
struct inet_frags *f, int *work);
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f);
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force);
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
struct inet_frags *f, void *key, unsigned int hash)
__releases(&f->lock);

9
net/ipv4/inet_fragment.c
View File

@ -89,7 +89,7 @@ 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);
inet_frag_evictor(nf, f, true);
local_bh_enable();
}
EXPORT_SYMBOL(inet_frags_exit_net);
@ -158,11 +158,16 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
}
EXPORT_SYMBOL(inet_frag_destroy);
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f)
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force)
{
struct inet_frag_queue *q;
int work, evicted = 0;
if (!force) {
if (atomic_read(&nf->mem) <= nf->high_thresh)
return 0;
}
work = atomic_read(&nf->mem) - nf->low_thresh;
while (work > 0) {
read_lock(&f->lock);

5
net/ipv4/ip_fragment.c
View File

@ -219,7 +219,7 @@ static void ip_evictor(struct net *net)
{
int evicted;
evicted = inet_frag_evictor(&net->ipv4.frags, &ip4_frags);
evicted = inet_frag_evictor(&net->ipv4.frags, &ip4_frags, false);
if (evicted)
IP_ADD_STATS_BH(net, IPSTATS_MIB_REASMFAILS, evicted);
}
@ -684,8 +684,7 @@ int ip_defrag(struct sk_buff *skb, u32 user)
IP_INC_STATS_BH(net, IPSTATS_MIB_REASMREQDS);
/* Start by cleaning up the memory. */
if (atomic_read(&net->ipv4.frags.mem) > net->ipv4.frags.high_thresh)
ip_evictor(net);
ip_evictor(net);
/* Lookup (or create) queue header */
if ((qp = ip_find(net, ip_hdr(skb), user)) != NULL) {

8
net/ipv6/netfilter/nf_conntrack_reasm.c
View File

@ -566,11 +566,9 @@ struct sk_buff *nf_ct_frag6_gather(struct sk_buff *skb, u32 user)
hdr = ipv6_hdr(clone);
fhdr = (struct frag_hdr *)skb_transport_header(clone);
if (atomic_read(&net->nf_frag.frags.mem) > net->nf_frag.frags.high_thresh) {
local_bh_disable();
inet_frag_evictor(&net->nf_frag.frags, &nf_frags);
local_bh_enable();
}
local_bh_disable();
inet_frag_evictor(&net->nf_frag.frags, &nf_frags, false);
local_bh_enable();
fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr);
if (fq == NULL) {

16
net/ipv6/reassembly.c
View File

@ -131,15 +131,6 @@ void ip6_frag_init(struct inet_frag_queue *q, void *a)
}
EXPORT_SYMBOL(ip6_frag_init);
static void ip6_evictor(struct net *net, struct inet6_dev *idev)
{
int evicted;
evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags);
if (evicted)
IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted);
}
void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
struct inet_frags *frags)
{
@ -515,6 +506,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
struct frag_queue *fq;
const struct ipv6hdr *hdr = ipv6_hdr(skb);
struct net *net = dev_net(skb_dst(skb)->dev);
int evicted;
IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS);
@ -539,8 +531,10 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
return 1;
}
if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh)
ip6_evictor(net, ip6_dst_idev(skb_dst(skb)));
evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags, false);
if (evicted)
IP6_ADD_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
IPSTATS_MIB_REASMFAILS, evicted);
fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr);
if (fq != NULL) {