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netfilter: cttimeout: decouple timeout policy from nfnetlink_cttimeout object

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The timeout policy is currently embedded into the nfnetlink_cttimeout
object, move the policy into an independent object. This allows us to
reuse part of the existing conntrack timeout extension from nf_tables
without adding dependencies with the nfnetlink_cttimeout object layout.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-08-07 17:14:15 +02:00
parent 4e665afbd7
commit 6c1fd7dc48
4 changed files with 41 additions and 32 deletions
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26
include/net/netfilter/nf_conntrack_timeout.h
View File

@ -11,24 +11,28 @@
#define CTNL_TIMEOUT_NAME_MAX 32
struct ctnl_timeout {
struct list_head head;
struct rcu_head rcu_head;
refcount_t refcnt;
char name[CTNL_TIMEOUT_NAME_MAX];
struct nf_ct_timeout {
__u16 l3num;
const struct nf_conntrack_l4proto *l4proto;
char data[0];
};
struct ctnl_timeout {
struct list_head head;
struct rcu_head rcu_head;
refcount_t refcnt;
char name[CTNL_TIMEOUT_NAME_MAX];
struct nf_ct_timeout timeout;
};
struct nf_conn_timeout {
struct ctnl_timeout __rcu *timeout;
struct nf_ct_timeout __rcu *timeout;
};
static inline unsigned int *
nf_ct_timeout_data(struct nf_conn_timeout *t)
{
struct ctnl_timeout *timeout;
struct nf_ct_timeout *timeout;
timeout = rcu_dereference(t->timeout);
if (timeout == NULL)
@ -49,7 +53,7 @@ struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
static inline
struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
struct ctnl_timeout *timeout,
struct nf_ct_timeout *timeout,
gfp_t gfp)
{
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
@ -83,7 +87,7 @@ static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
int nf_conntrack_timeout_init(void);
void nf_conntrack_timeout_fini(void);
void nf_ct_untimeout(struct net *net, struct ctnl_timeout *timeout);
void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
#else
static inline int nf_conntrack_timeout_init(void)
{
@ -97,8 +101,8 @@ static inline void nf_conntrack_timeout_fini(void)
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
extern struct nf_ct_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
#endif
#endif /* _NF_CONNTRACK_TIMEOUT_H */

6
net/netfilter/nf_conntrack_timeout.c
View File

@ -24,11 +24,11 @@
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_timeout.h>
struct ctnl_timeout *
struct nf_ct_timeout *
(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name) __read_mostly;
EXPORT_SYMBOL_GPL(nf_ct_timeout_find_get_hook);
void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout) __read_mostly;
void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout) __read_mostly;
EXPORT_SYMBOL_GPL(nf_ct_timeout_put_hook);
static int untimeout(struct nf_conn *ct, void *timeout)
@ -42,7 +42,7 @@ static int untimeout(struct nf_conn *ct, void *timeout)
return 0;
}
void nf_ct_untimeout(struct net *net, struct ctnl_timeout *timeout)
void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout)
{
nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
}

37
net/netfilter/nfnetlink_cttimeout.c
View File

@ -113,13 +113,13 @@ static int cttimeout_new_timeout(struct net *net, struct sock *ctnl,
/* You cannot replace one timeout policy by another of
* different kind, sorry.
*/
if (matching->l3num != l3num ||
matching->l4proto->l4proto != l4num)
if (matching->timeout.l3num != l3num ||
matching->timeout.l4proto->l4proto != l4num)
return -EINVAL;
return ctnl_timeout_parse_policy(&matching->data,
matching->l4proto, net,
cda[CTA_TIMEOUT_DATA]);
return ctnl_timeout_parse_policy(&matching->timeout.data,
matching->timeout.l4proto,
net, cda[CTA_TIMEOUT_DATA]);
}
return -EBUSY;
@ -140,14 +140,14 @@ static int cttimeout_new_timeout(struct net *net, struct sock *ctnl,
goto err_proto_put;
}
ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net,
ret = ctnl_timeout_parse_policy(&timeout->timeout.data, l4proto, net,
cda[CTA_TIMEOUT_DATA]);
if (ret < 0)
goto err;
strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
timeout->l3num = l3num;
timeout->l4proto = l4proto;
timeout->timeout.l3num = l3num;
timeout->timeout.l4proto = l4proto;
refcount_set(&timeout->refcnt, 1);
list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list);
@ -166,7 +166,7 @@ ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0;
const struct nf_conntrack_l4proto *l4proto = timeout->l4proto;
const struct nf_conntrack_l4proto *l4proto = timeout->timeout.l4proto;
event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
@ -179,8 +179,9 @@ ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
nfmsg->res_id = 0;
if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) ||
nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) ||
nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
nla_put_be16(skb, CTA_TIMEOUT_L3PROTO,
htons(timeout->timeout.l3num)) ||
nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto) ||
nla_put_be32(skb, CTA_TIMEOUT_USE,
htonl(refcount_read(&timeout->refcnt))))
goto nla_put_failure;
@ -194,7 +195,8 @@ ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
if (!nest_parms)
goto nla_put_failure;
ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
ret = l4proto->ctnl_timeout.obj_to_nlattr(skb,
&timeout->timeout.data);
if (ret < 0)
goto nla_put_failure;
@ -308,8 +310,8 @@ static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout)
if (refcount_dec_if_one(&timeout->refcnt)) {
/* We are protected by nfnl mutex. */
list_del_rcu(&timeout->head);
nf_ct_l4proto_put(timeout->l4proto);
nf_ct_untimeout(net, timeout);
nf_ct_l4proto_put(timeout->timeout.l4proto);
nf_ct_untimeout(net, &timeout->timeout);
kfree_rcu(timeout, rcu_head);
} else {
ret = -EBUSY;
@ -510,8 +512,11 @@ err:
return matching;
}
static void ctnl_timeout_put(struct ctnl_timeout *timeout)
static void ctnl_timeout_put(struct nf_ct_timeout *t)
{
struct ctnl_timeout *timeout =
container_of(t, struct ctnl_timeout, timeout);
if (refcount_dec_and_test(&timeout->refcnt))
kfree_rcu(timeout, rcu_head);
@ -561,7 +566,7 @@ static void __net_exit cttimeout_net_exit(struct net *net)
list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) {
list_del_rcu(&cur->head);
nf_ct_l4proto_put(cur->l4proto);
nf_ct_l4proto_put(cur->timeout.l4proto);
if (refcount_dec_and_test(&cur->refcnt))
kfree_rcu(cur, rcu_head);

4
net/netfilter/xt_CT.c
View File

@ -104,7 +104,7 @@ xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
}
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
static void __xt_ct_tg_timeout_put(struct nf_ct_timeout *timeout)
{
typeof(nf_ct_timeout_put_hook) timeout_put;
@ -121,7 +121,7 @@ xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par,
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
const struct nf_conntrack_l4proto *l4proto;
struct ctnl_timeout *timeout;
struct nf_ct_timeout *timeout;
struct nf_conn_timeout *timeout_ext;
const char *errmsg = NULL;
int ret = 0;