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Message-Id: <20180108202000.12989-2-pablo@netfilter.org>
Date: Mon, 8 Jan 2018 21:19:09 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 01/52] netfilter: conntrack: remove nlattr_size pointer from l4proto trackers
From: Florian Westphal <fw@...len.de>
similar to previous commit, but instead compute this at compile time
and turn nlattr_size into an u16.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_conntrack_l4proto.h | 7 +++----
net/netfilter/nf_conntrack_netlink.c | 2 +-
net/netfilter/nf_conntrack_proto.c | 6 +-----
net/netfilter/nf_conntrack_proto_dccp.c | 17 ++++++++---------
net/netfilter/nf_conntrack_proto_sctp.c | 15 +++++++--------
net/netfilter/nf_conntrack_proto_tcp.c | 16 ++++++++--------
6 files changed, 28 insertions(+), 35 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index 7ef56c13698a..0e5618ec8b9d 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -27,6 +27,9 @@ struct nf_conntrack_l4proto {
/* Resolve clashes on insertion races. */
bool allow_clash;
+ /* protoinfo nlattr size, closes a hole */
+ u16 nlattr_size;
+
/* Try to fill in the third arg: dataoff is offset past network protocol
hdr. Return true if possible. */
bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
@@ -66,8 +69,6 @@ struct nf_conntrack_l4proto {
/* convert protoinfo to nfnetink attributes */
int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
struct nf_conn *ct);
- /* Calculate protoinfo nlattr size */
- int (*nlattr_size)(void);
/* convert nfnetlink attributes to protoinfo */
int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
@@ -80,8 +81,6 @@ struct nf_conntrack_l4proto {
struct nf_conntrack_tuple *t);
const struct nla_policy *nla_policy;
- size_t nla_size;
-
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
struct {
int (*nlattr_to_obj)(struct nlattr *tb[],
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 382d49792f42..316bbdc4a158 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -544,7 +544,7 @@ static size_t ctnetlink_proto_size(const struct nf_conn *ct)
len *= 3u; /* ORIG, REPLY, MASTER */
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
- len += l4proto->nla_size;
+ len += l4proto->nlattr_size;
if (l4proto->nlattr_tuple_size) {
len4 = l4proto->nlattr_tuple_size();
len4 *= 3u; /* ORIG, REPLY, MASTER */
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index c8e9c9503a08..19c3b1b84544 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -392,7 +392,7 @@ int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto)
if (l4proto->l3proto >= ARRAY_SIZE(nf_ct_protos))
return -EBUSY;
- if ((l4proto->to_nlattr && !l4proto->nlattr_size) ||
+ if ((l4proto->to_nlattr && l4proto->nlattr_size == 0) ||
(l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size))
return -EINVAL;
@@ -428,10 +428,6 @@ int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto)
goto out_unlock;
}
- l4proto->nla_size = 0;
- if (l4proto->nlattr_size)
- l4proto->nla_size += l4proto->nlattr_size();
-
rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
l4proto);
out_unlock:
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index 2a446f4a554c..2fee7c96ec09 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -654,6 +654,12 @@ static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = {
[CTA_PROTOINFO_DCCP_PAD] = { .type = NLA_UNSPEC },
};
+#define DCCP_NLATTR_SIZE ( \
+ NLA_ALIGN(NLA_HDRLEN + 1) + \
+ NLA_ALIGN(NLA_HDRLEN + 1) + \
+ NLA_ALIGN(NLA_HDRLEN + sizeof(u64)) + \
+ NLA_ALIGN(NLA_HDRLEN + 0))
+
static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
{
struct nlattr *attr = cda[CTA_PROTOINFO_DCCP];
@@ -691,13 +697,6 @@ static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
spin_unlock_bh(&ct->lock);
return 0;
}
-
-static int dccp_nlattr_size(void)
-{
- return nla_total_size(0) /* CTA_PROTOINFO_DCCP */
- + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1);
-}
-
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
@@ -876,8 +875,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp4 __read_mostly = {
.print_conntrack = dccp_print_conntrack,
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_size = DCCP_NLATTR_SIZE,
.to_nlattr = dccp_to_nlattr,
- .nlattr_size = dccp_nlattr_size,
.from_nlattr = nlattr_to_dccp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
@@ -912,8 +911,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp6 __read_mostly = {
.print_conntrack = dccp_print_conntrack,
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_size = DCCP_NLATTR_SIZE,
.to_nlattr = dccp_to_nlattr,
- .nlattr_size = dccp_nlattr_size,
.from_nlattr = nlattr_to_dccp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 80faf04ddf15..f5bff4de0386 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -578,6 +578,11 @@ static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
[CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
};
+#define SCTP_NLATTR_SIZE ( \
+ NLA_ALIGN(NLA_HDRLEN + 1) + \
+ NLA_ALIGN(NLA_HDRLEN + 4) + \
+ NLA_ALIGN(NLA_HDRLEN + 4))
+
static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
{
struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
@@ -608,12 +613,6 @@ static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
return 0;
}
-
-static int sctp_nlattr_size(void)
-{
- return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
- + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
-}
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
@@ -793,8 +792,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
.can_early_drop = sctp_can_early_drop,
.me = THIS_MODULE,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_size = SCTP_NLATTR_SIZE,
.to_nlattr = sctp_to_nlattr,
- .nlattr_size = sctp_nlattr_size,
.from_nlattr = nlattr_to_sctp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
@@ -830,8 +829,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
.can_early_drop = sctp_can_early_drop,
.me = THIS_MODULE,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_size = SCTP_NLATTR_SIZE,
.to_nlattr = sctp_to_nlattr,
- .nlattr_size = sctp_nlattr_size,
.from_nlattr = nlattr_to_sctp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 37ef35b861f2..9875a3623676 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -1222,6 +1222,12 @@ static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = {
[CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) },
};
+#define TCP_NLATTR_SIZE ( \
+ NLA_ALIGN(NLA_HDRLEN + 1) + \
+ NLA_ALIGN(NLA_HDRLEN + 1) + \
+ NLA_ALIGN(NLA_HDRLEN + sizeof(sizeof(struct nf_ct_tcp_flags))) + \
+ NLA_ALIGN(NLA_HDRLEN + sizeof(sizeof(struct nf_ct_tcp_flags))))
+
static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct)
{
struct nlattr *pattr = cda[CTA_PROTOINFO_TCP];
@@ -1274,12 +1280,6 @@ static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct)
return 0;
}
-static int tcp_nlattr_size(void)
-{
- return nla_total_size(0) /* CTA_PROTOINFO_TCP */
- + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1);
-}
-
static unsigned int tcp_nlattr_tuple_size(void)
{
static unsigned int size __read_mostly;
@@ -1557,11 +1557,11 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
.can_early_drop = tcp_can_early_drop,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.to_nlattr = tcp_to_nlattr,
- .nlattr_size = tcp_nlattr_size,
.from_nlattr = nlattr_to_tcp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
.nlattr_tuple_size = tcp_nlattr_tuple_size,
+ .nlattr_size = TCP_NLATTR_SIZE,
.nla_policy = nf_ct_port_nla_policy,
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
@@ -1594,8 +1594,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly =
.error = tcp_error,
.can_early_drop = tcp_can_early_drop,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+ .nlattr_size = TCP_NLATTR_SIZE,
.to_nlattr = tcp_to_nlattr,
- .nlattr_size = tcp_nlattr_size,
.from_nlattr = nlattr_to_tcp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
--
2.11.0
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