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netns xfrm: per-netns xfrm_state_all list

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This is done to get
a) simple "something leaked" check
b) cover possible DoSes when other netns puts many, many xfrm_states
   onto a list.
c) not miss "alien xfrm_state" check in some of list iterators in future.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2008-11-25 17:16:11 -08:00 committed by David S. Miller
parent 673c09be45
commit 9d4139c769
2 changed files with 11 additions and 6 deletions
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3
include/net/netns/xfrm.h
View File

@ -1,7 +1,10 @@
#ifndef __NETNS_XFRM_H
#define __NETNS_XFRM_H
#include <linux/list.h>
struct netns_xfrm {
struct list_head state_all;
};
#endif

14
net/xfrm/xfrm_state.c
View File

@ -50,7 +50,6 @@ static DEFINE_SPINLOCK(xfrm_state_lock);
* Main use is finding SA after policy selected tunnel or transport mode.
* Also, it can be used by ah/esp icmp error handler to find offending SA.
*/
static LIST_HEAD(xfrm_state_all);
static struct hlist_head *xfrm_state_bydst __read_mostly;
static struct hlist_head *xfrm_state_bysrc __read_mostly;
static struct hlist_head *xfrm_state_byspi __read_mostly;
@ -855,7 +854,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
if (km_query(x, tmpl, pol) == 0) {
x->km.state = XFRM_STATE_ACQ;
list_add(&x->km.all, &xfrm_state_all);
list_add(&x->km.all, &init_net.xfrm.state_all);
hlist_add_head(&x->bydst, xfrm_state_bydst+h);
h = xfrm_src_hash(daddr, saddr, family);
hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
@ -924,7 +923,7 @@ static void __xfrm_state_insert(struct xfrm_state *x)
x->genid = ++xfrm_state_genid;
list_add(&x->km.all, &xfrm_state_all);
list_add(&x->km.all, &init_net.xfrm.state_all);
h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
x->props.reqid, x->props.family);
@ -1053,7 +1052,7 @@ static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 re
xfrm_state_hold(x);
x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ;
add_timer(&x->timer);
list_add(&x->km.all, &xfrm_state_all);
list_add(&x->km.all, &init_net.xfrm.state_all);
hlist_add_head(&x->bydst, xfrm_state_bydst+h);
h = xfrm_src_hash(daddr, saddr, family);
hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
@ -1559,10 +1558,10 @@ int xfrm_state_walk(struct xfrm_state_walk *walk,
spin_lock_bh(&xfrm_state_lock);
if (list_empty(&walk->all))
x = list_first_entry(&xfrm_state_all, struct xfrm_state_walk, all);
x = list_first_entry(&init_net.xfrm.state_all, struct xfrm_state_walk, all);
else
x = list_entry(&walk->all, struct xfrm_state_walk, all);
list_for_each_entry_from(x, &xfrm_state_all, all) {
list_for_each_entry_from(x, &init_net.xfrm.state_all, all) {
if (x->state == XFRM_STATE_DEAD)
continue;
state = container_of(x, struct xfrm_state, km);
@ -2085,6 +2084,8 @@ int __net_init xfrm_state_init(struct net *net)
{
unsigned int sz;
INIT_LIST_HEAD(&net->xfrm.state_all);
sz = sizeof(struct hlist_head) * 8;
xfrm_state_bydst = xfrm_hash_alloc(sz);
@ -2100,6 +2101,7 @@ int __net_init xfrm_state_init(struct net *net)
void xfrm_state_fini(struct net *net)
{
WARN_ON(!list_empty(&net->xfrm.state_all));
}
#ifdef CONFIG_AUDITSYSCALL