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Message-Id: <20220209133616.165104-8-pablo@netfilter.org>
Date: Wed, 9 Feb 2022 14:36:09 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net-next 07/14] netfilter: conntrack: pptp: use single option structure
From: Florian Westphal <fw@...len.de>
Instead of exposing the four hooks individually use a sinle hook ops
structure.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/linux/netfilter/nf_conntrack_pptp.h | 38 ++++++-------
net/ipv4/netfilter/nf_nat_pptp.c | 24 ++++-----
net/netfilter/nf_conntrack_pptp.c | 60 +++++++--------------
3 files changed, 45 insertions(+), 77 deletions(-)
diff --git a/include/linux/netfilter/nf_conntrack_pptp.h b/include/linux/netfilter/nf_conntrack_pptp.h
index a28aa289afdc..c3bdb4370938 100644
--- a/include/linux/netfilter/nf_conntrack_pptp.h
+++ b/include/linux/netfilter/nf_conntrack_pptp.h
@@ -300,26 +300,22 @@ union pptp_ctrl_union {
struct PptpSetLinkInfo setlink;
};
-extern int
-(*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo,
- unsigned int protoff,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq);
-
-extern int
-(*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo,
- unsigned int protoff,
- struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq);
-
-extern void
-(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *exp_orig,
- struct nf_conntrack_expect *exp_reply);
-
-extern void
-(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
- struct nf_conntrack_expect *exp);
+struct nf_nat_pptp_hook {
+ int (*outbound)(struct sk_buff *skb,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+ unsigned int protoff,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq);
+ int (*inbound)(struct sk_buff *skb,
+ struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+ unsigned int protoff,
+ struct PptpControlHeader *ctlh,
+ union pptp_ctrl_union *pptpReq);
+ void (*exp_gre)(struct nf_conntrack_expect *exp_orig,
+ struct nf_conntrack_expect *exp_reply);
+ void (*expectfn)(struct nf_conn *ct,
+ struct nf_conntrack_expect *exp);
+};
+extern const struct nf_nat_pptp_hook __rcu *nf_nat_pptp_hook;
#endif /* _NF_CONNTRACK_PPTP_H */
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
index 3f248a19faa3..fab357cc8559 100644
--- a/net/ipv4/netfilter/nf_nat_pptp.c
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -295,28 +295,24 @@ pptp_inbound_pkt(struct sk_buff *skb,
return NF_ACCEPT;
}
+static const struct nf_nat_pptp_hook pptp_hooks = {
+ .outbound = pptp_outbound_pkt,
+ .inbound = pptp_inbound_pkt,
+ .exp_gre = pptp_exp_gre,
+ .expectfn = pptp_nat_expected,
+};
+
static int __init nf_nat_helper_pptp_init(void)
{
- BUG_ON(nf_nat_pptp_hook_outbound != NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_outbound, pptp_outbound_pkt);
-
- BUG_ON(nf_nat_pptp_hook_inbound != NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_inbound, pptp_inbound_pkt);
-
- BUG_ON(nf_nat_pptp_hook_exp_gre != NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_exp_gre, pptp_exp_gre);
+ WARN_ON(nf_nat_pptp_hook != NULL);
+ RCU_INIT_POINTER(nf_nat_pptp_hook, &pptp_hooks);
- BUG_ON(nf_nat_pptp_hook_expectfn != NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_expectfn, pptp_nat_expected);
return 0;
}
static void __exit nf_nat_helper_pptp_fini(void)
{
- RCU_INIT_POINTER(nf_nat_pptp_hook_expectfn, NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_exp_gre, NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_inbound, NULL);
- RCU_INIT_POINTER(nf_nat_pptp_hook_outbound, NULL);
+ RCU_INIT_POINTER(nf_nat_pptp_hook, NULL);
synchronize_rcu();
}
diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
index 7d5708b92138..f3fa367b455f 100644
--- a/net/netfilter/nf_conntrack_pptp.c
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -45,30 +45,8 @@ MODULE_ALIAS_NFCT_HELPER("pptp");
static DEFINE_SPINLOCK(nf_pptp_lock);
-int
-(*nf_nat_pptp_hook_outbound)(struct sk_buff *skb,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo,
- unsigned int protoff, struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq) __read_mostly;
-EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_outbound);
-
-int
-(*nf_nat_pptp_hook_inbound)(struct sk_buff *skb,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo,
- unsigned int protoff, struct PptpControlHeader *ctlh,
- union pptp_ctrl_union *pptpReq) __read_mostly;
-EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_inbound);
-
-void
-(*nf_nat_pptp_hook_exp_gre)(struct nf_conntrack_expect *expect_orig,
- struct nf_conntrack_expect *expect_reply)
- __read_mostly;
-EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_exp_gre);
-
-void
-(*nf_nat_pptp_hook_expectfn)(struct nf_conn *ct,
- struct nf_conntrack_expect *exp) __read_mostly;
-EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_expectfn);
+const struct nf_nat_pptp_hook *nf_nat_pptp_hook;
+EXPORT_SYMBOL_GPL(nf_nat_pptp_hook);
#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
/* PptpControlMessageType names */
@@ -111,8 +89,8 @@ EXPORT_SYMBOL(pptp_msg_name);
static void pptp_expectfn(struct nf_conn *ct,
struct nf_conntrack_expect *exp)
{
+ const struct nf_nat_pptp_hook *hook;
struct net *net = nf_ct_net(ct);
- typeof(nf_nat_pptp_hook_expectfn) nf_nat_pptp_expectfn;
pr_debug("increasing timeouts\n");
/* increase timeout of GRE data channel conntrack entry */
@@ -122,9 +100,9 @@ static void pptp_expectfn(struct nf_conn *ct,
/* Can you see how rusty this code is, compared with the pre-2.6.11
* one? That's what happened to my shiny newnat of 2002 ;( -HW */
- nf_nat_pptp_expectfn = rcu_dereference(nf_nat_pptp_hook_expectfn);
- if (nf_nat_pptp_expectfn && ct->master->status & IPS_NAT_MASK)
- nf_nat_pptp_expectfn(ct, exp);
+ hook = rcu_dereference(nf_nat_pptp_hook);
+ if (hook && ct->master->status & IPS_NAT_MASK)
+ hook->expectfn(ct, exp);
else {
struct nf_conntrack_tuple inv_t;
struct nf_conntrack_expect *exp_other;
@@ -209,9 +187,9 @@ static void pptp_destroy_siblings(struct nf_conn *ct)
static int exp_gre(struct nf_conn *ct, __be16 callid, __be16 peer_callid)
{
struct nf_conntrack_expect *exp_orig, *exp_reply;
+ const struct nf_nat_pptp_hook *hook;
enum ip_conntrack_dir dir;
int ret = 1;
- typeof(nf_nat_pptp_hook_exp_gre) nf_nat_pptp_exp_gre;
exp_orig = nf_ct_expect_alloc(ct);
if (exp_orig == NULL)
@@ -239,9 +217,9 @@ static int exp_gre(struct nf_conn *ct, __be16 callid, __be16 peer_callid)
IPPROTO_GRE, &callid, &peer_callid);
exp_reply->expectfn = pptp_expectfn;
- nf_nat_pptp_exp_gre = rcu_dereference(nf_nat_pptp_hook_exp_gre);
- if (nf_nat_pptp_exp_gre && ct->status & IPS_NAT_MASK)
- nf_nat_pptp_exp_gre(exp_orig, exp_reply);
+ hook = rcu_dereference(nf_nat_pptp_hook);
+ if (hook && ct->status & IPS_NAT_MASK)
+ hook->exp_gre(exp_orig, exp_reply);
if (nf_ct_expect_related(exp_orig, 0) != 0)
goto out_put_both;
if (nf_ct_expect_related(exp_reply, 0) != 0)
@@ -279,9 +257,9 @@ pptp_inbound_pkt(struct sk_buff *skb, unsigned int protoff,
enum ip_conntrack_info ctinfo)
{
struct nf_ct_pptp_master *info = nfct_help_data(ct);
+ const struct nf_nat_pptp_hook *hook;
u_int16_t msg;
__be16 cid = 0, pcid = 0;
- typeof(nf_nat_pptp_hook_inbound) nf_nat_pptp_inbound;
msg = ntohs(ctlh->messageType);
pr_debug("inbound control message %s\n", pptp_msg_name(msg));
@@ -383,10 +361,9 @@ pptp_inbound_pkt(struct sk_buff *skb, unsigned int protoff,
goto invalid;
}
- nf_nat_pptp_inbound = rcu_dereference(nf_nat_pptp_hook_inbound);
- if (nf_nat_pptp_inbound && ct->status & IPS_NAT_MASK)
- return nf_nat_pptp_inbound(skb, ct, ctinfo,
- protoff, ctlh, pptpReq);
+ hook = rcu_dereference(nf_nat_pptp_hook);
+ if (hook && ct->status & IPS_NAT_MASK)
+ return hook->inbound(skb, ct, ctinfo, protoff, ctlh, pptpReq);
return NF_ACCEPT;
invalid:
@@ -407,9 +384,9 @@ pptp_outbound_pkt(struct sk_buff *skb, unsigned int protoff,
enum ip_conntrack_info ctinfo)
{
struct nf_ct_pptp_master *info = nfct_help_data(ct);
+ const struct nf_nat_pptp_hook *hook;
u_int16_t msg;
__be16 cid = 0, pcid = 0;
- typeof(nf_nat_pptp_hook_outbound) nf_nat_pptp_outbound;
msg = ntohs(ctlh->messageType);
pr_debug("outbound control message %s\n", pptp_msg_name(msg));
@@ -479,10 +456,9 @@ pptp_outbound_pkt(struct sk_buff *skb, unsigned int protoff,
goto invalid;
}
- nf_nat_pptp_outbound = rcu_dereference(nf_nat_pptp_hook_outbound);
- if (nf_nat_pptp_outbound && ct->status & IPS_NAT_MASK)
- return nf_nat_pptp_outbound(skb, ct, ctinfo,
- protoff, ctlh, pptpReq);
+ hook = rcu_dereference(nf_nat_pptp_hook);
+ if (hook && ct->status & IPS_NAT_MASK)
+ return hook->outbound(skb, ct, ctinfo, protoff, ctlh, pptpReq);
return NF_ACCEPT;
invalid:
--
2.30.2
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