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[NETFILTER]: nf_conntrack: more sanity checks in protocol registration/unregistration 

Add some more sanity checks when registering/unregistering l3/l4 protocols.

Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Martin Josefsson 2006-11-29 02:35:08 +01:00 committed by David S. Miller
parent 605dcad6c8
commit ae5718fb3d
4 changed files with 54 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/netfilter/nf_conntrack_l3proto.h
View File

@ -86,7 +86,7 @@ extern struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX];
/* Protocol registration. */
extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
extern int nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
extern struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto);

2
include/net/netfilter/nf_conntrack_l4proto.h
View File

@ -102,7 +102,7 @@ extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
/* Protocol registration. */
extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
extern int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
/* Generic netlink helpers */
extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,

2
net/netfilter/nf_conntrack_core.c
View File

@ -1198,7 +1198,7 @@ int __init nf_conntrack_init(void)
/* Don't NEED lock here, but good form anyway. */
write_lock_bh(&nf_conntrack_lock);
for (i = 0; i < PF_MAX; i++)
for (i = 0; i < AF_MAX; i++)
nf_ct_l3protos[i] = &nf_conntrack_l3proto_generic;
write_unlock_bh(&nf_conntrack_lock);

59
net/netfilter/nf_conntrack_proto.c
View File

@ -28,7 +28,7 @@
#include <net/netfilter/nf_conntrack_core.h>
struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX] __read_mostly;
struct nf_conntrack_l3proto *nf_ct_l3protos[PF_MAX] __read_mostly;
struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX] __read_mostly;
struct nf_conntrack_l4proto *
__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto)
@ -128,21 +128,40 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
{
int ret = 0;
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) {
if (proto->l3proto >= AF_MAX) {
ret = -EBUSY;
goto out;
}
nf_ct_l3protos[proto->l3proto] = proto;
out:
write_unlock_bh(&nf_conntrack_lock);
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) {
ret = -EBUSY;
goto out_unlock;
}
nf_ct_l3protos[proto->l3proto] = proto;
out_unlock:
write_unlock_bh(&nf_conntrack_lock);
out:
return ret;
}
void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
int nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
{
int ret = 0;
if (proto->l3proto >= AF_MAX) {
ret = -EBUSY;
goto out;
}
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_l3protos[proto->l3proto] != proto) {
write_unlock_bh(&nf_conntrack_lock);
ret = -EBUSY;
goto out;
}
nf_ct_l3protos[proto->l3proto] = &nf_conntrack_l3proto_generic;
write_unlock_bh(&nf_conntrack_lock);
@ -151,6 +170,9 @@ void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
/* Remove all contrack entries for this protocol */
nf_ct_iterate_cleanup(kill_l3proto, proto);
out:
return ret;
}
/* FIXME: Allow NULL functions and sub in pointers to generic for
@ -159,6 +181,11 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto)
{
int ret = 0;
if (l4proto->l3proto >= PF_MAX) {
ret = -EBUSY;
goto out;
}
retry:
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_protos[l4proto->l3proto]) {
@ -210,9 +237,22 @@ out:
return ret;
}
void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
{
int ret = 0;
if (l4proto->l3proto >= PF_MAX) {
ret = -EBUSY;
goto out;
}
write_lock_bh(&nf_conntrack_lock);
if (nf_ct_protos[l4proto->l3proto][l4proto->l4proto]
!= l4proto) {
write_unlock_bh(&nf_conntrack_lock);
ret = -EBUSY;
goto out;
}
nf_ct_protos[l4proto->l3proto][l4proto->l4proto]
= &nf_conntrack_l4proto_generic;
write_unlock_bh(&nf_conntrack_lock);
@ -222,4 +262,7 @@ void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
/* Remove all contrack entries for this protocol */
nf_ct_iterate_cleanup(kill_l4proto, l4proto);
out:
return ret;
}