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[NETNS][FRAGS]: Make the inet_frag_queue lookup work in namespaces.

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Since fragment management code is consolidated, we cannot have the
pointer from inet_frag_queue to struct net, since we must know what
king of fragment this is.

So, I introduce the netns_frags structure. This one is currently
empty, but will be eventually filled with per-namespace
attributes. Each inet_frag_queue is tagged with this one.

The conntrack_reasm is not "netns-izated", so it has one static
netns_frags instance to keep working in init namespace.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-01-22 06:02:14 -08:00 committed by David S. Miller
parent 8d8354d2fb
commit ac18e7509e
7 changed files with 38 additions and 21 deletions
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8
include/net/inet_frag.h
View File

@ -1,8 +1,12 @@
#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__
struct netns_frags {
};
struct inet_frag_queue {
struct hlist_node list;
struct netns_frags *net;
struct list_head lru_list; /* lru list member */
spinlock_t lock;
atomic_t refcnt;
@ -55,8 +59,8 @@ 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 inet_frags *f);
struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,
unsigned int hash);
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
struct inet_frags *f, void *key, unsigned int hash);
static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
{

4
include/net/netns/ipv4.h
View File

@ -5,6 +5,8 @@
#ifndef __NETNS_IPV4_H__
#define __NETNS_IPV4_H__
#include <net/inet_frag.h>
struct ctl_table_header;
struct ipv4_devconf;
struct fib_rules_ops;
@ -22,5 +24,7 @@ struct netns_ipv4 {
#endif
struct hlist_head *fib_table_hash;
struct sock *fibnl;
struct netns_frags frags;
};
#endif

1
include/net/netns/ipv6.h
View File

@ -30,5 +30,6 @@ struct netns_ipv6 {
struct netns_sysctl_ipv6 sysctl;
struct ipv6_devconf *devconf_all;
struct ipv6_devconf *devconf_dflt;
struct netns_frags frags;
};
#endif

27
net/ipv4/inet_fragment.c
View File

@ -174,8 +174,9 @@ int inet_frag_evictor(struct inet_frags *f)
}
EXPORT_SYMBOL(inet_frag_evictor);
static struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
struct inet_frags *f, unsigned int hash, void *arg)
static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
struct inet_frag_queue *qp_in, struct inet_frags *f,
unsigned int hash, void *arg)
{
struct inet_frag_queue *qp;
#ifdef CONFIG_SMP
@ -189,7 +190,7 @@ static struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
* promoted read lock to write lock.
*/
hlist_for_each_entry(qp, n, &f->hash[hash], list) {
if (f->match(qp, arg)) {
if (qp->net == nf && f->match(qp, arg)) {
atomic_inc(&qp->refcnt);
write_unlock(&f->lock);
qp_in->last_in |= COMPLETE;
@ -210,7 +211,8 @@ static struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
return qp;
}
static struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f, void *arg)
static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
struct inet_frags *f, void *arg)
{
struct inet_frag_queue *q;
@ -223,31 +225,32 @@ static struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f, void *arg)
setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
spin_lock_init(&q->lock);
atomic_set(&q->refcnt, 1);
q->net = nf;
return q;
}
static struct inet_frag_queue *inet_frag_create(struct inet_frags *f,
void *arg, unsigned int hash)
static struct inet_frag_queue *inet_frag_create(struct netns_frags *nf,
struct inet_frags *f, void *arg, unsigned int hash)
{
struct inet_frag_queue *q;
q = inet_frag_alloc(f, arg);
q = inet_frag_alloc(nf, f, arg);
if (q == NULL)
return NULL;
return inet_frag_intern(q, f, hash, arg);
return inet_frag_intern(nf, q, f, hash, arg);
}
struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,
unsigned int hash)
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
struct inet_frags *f, void *key, unsigned int hash)
{
struct inet_frag_queue *q;
struct hlist_node *n;
read_lock(&f->lock);
hlist_for_each_entry(q, n, &f->hash[hash], list) {
if (f->match(q, key)) {
if (q->net == nf && f->match(q, key)) {
atomic_inc(&q->refcnt);
read_unlock(&f->lock);
return q;
@ -255,6 +258,6 @@ struct inet_frag_queue *inet_frag_find(struct inet_frags *f, void *key,
}
read_unlock(&f->lock);
return inet_frag_create(f, key, hash);
return inet_frag_create(nf, f, key, hash);
}
EXPORT_SYMBOL(inet_frag_find);

8
net/ipv4/ip_fragment.c
View File

@ -236,7 +236,7 @@ out:
/* Find the correct entry in the "incomplete datagrams" queue for
* this IP datagram, and create new one, if nothing is found.
*/
static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
static inline struct ipq *ip_find(struct net *net, struct iphdr *iph, u32 user)
{
struct inet_frag_queue *q;
struct ip4_create_arg arg;
@ -246,7 +246,7 @@ static inline struct ipq *ip_find(struct iphdr *iph, u32 user)
arg.user = user;
hash = ipqhashfn(iph->id, iph->saddr, iph->daddr, iph->protocol);
q = inet_frag_find(&ip4_frags, &arg, hash);
q = inet_frag_find(&net->ipv4.frags, &ip4_frags, &arg, hash);
if (q == NULL)
goto out_nomem;
@ -582,15 +582,17 @@ out_fail:
int ip_defrag(struct sk_buff *skb, u32 user)
{
struct ipq *qp;
struct net *net;
IP_INC_STATS_BH(IPSTATS_MIB_REASMREQDS);
net = skb->dev->nd_net;
/* Start by cleaning up the memory. */
if (atomic_read(&ip4_frags.mem) > ip4_frags_ctl.high_thresh)
ip_evictor();
/* Lookup (or create) queue header */
if ((qp = ip_find(ip_hdr(skb), user)) != NULL) {
if ((qp = ip_find(net, ip_hdr(skb), user)) != NULL) {
int ret;
spin_lock(&qp->q.lock);

3
net/ipv6/netfilter/nf_conntrack_reasm.c
View File

@ -78,6 +78,7 @@ static struct inet_frags_ctl nf_frags_ctl __read_mostly = {
};
static struct inet_frags nf_frags;
static struct netns_frags nf_init_frags;
#ifdef CONFIG_SYSCTL
struct ctl_table nf_ct_ipv6_sysctl_table[] = {
@ -212,7 +213,7 @@ fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst)
arg.dst = dst;
hash = ip6qhashfn(id, src, dst);
q = inet_frag_find(&nf_frags, &arg, hash);
q = inet_frag_find(&nf_init_frags, &nf_frags, &arg, hash);
if (q == NULL)
goto oom;

8
net/ipv6/reassembly.c
View File

@ -234,7 +234,7 @@ out:
}
static __inline__ struct frag_queue *
fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst,
struct inet6_dev *idev)
{
struct inet_frag_queue *q;
@ -246,7 +246,7 @@ fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst,
arg.dst = dst;
hash = ip6qhashfn(id, src, dst);
q = inet_frag_find(&ip6_frags, &arg, hash);
q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);
if (q == NULL)
goto oom;
@ -568,6 +568,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
struct frag_hdr *fhdr;
struct frag_queue *fq;
struct ipv6hdr *hdr = ipv6_hdr(skb);
struct net *net;
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMREQDS);
@ -598,10 +599,11 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
return 1;
}
net = skb->dev->nd_net;
if (atomic_read(&ip6_frags.mem) > init_net.ipv6.sysctl.frags.high_thresh)
ip6_evictor(ip6_dst_idev(skb->dst));
if ((fq = fq_find(fhdr->identification, &hdr->saddr, &hdr->daddr,
if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr,
ip6_dst_idev(skb->dst))) != NULL) {
int ret;