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Date: Sun, 11 Dec 2022 11:11:55 +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,
pabeni@...hat.com, edumazet@...gle.com
Subject: [PATCH net-next 03/12] netfilter: conntrack: merge ipv4+ipv6 confirm functions
From: Florian Westphal <fw@...len.de>
No need to have distinct functions. After merge, ipv6 can avoid
protooff computation if the connection neither needs sequence adjustment
nor helper invocation -- this is the normal case.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_conntrack_core.h | 3 +-
net/bridge/netfilter/nf_conntrack_bridge.c | 32 +-----
net/netfilter/nf_conntrack_proto.c | 124 +++++++++------------
3 files changed, 57 insertions(+), 102 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h
index b2b9de70d9f4..71d1269fe4d4 100644
--- a/include/net/netfilter/nf_conntrack_core.h
+++ b/include/net/netfilter/nf_conntrack_core.h
@@ -71,8 +71,7 @@ static inline int nf_conntrack_confirm(struct sk_buff *skb)
return ret;
}
-unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo);
+unsigned int nf_confirm(void *priv, struct sk_buff *skb, const struct nf_hook_state *state);
void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l4proto *proto);
diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c
index 73242962be5d..5c5dd437f1c2 100644
--- a/net/bridge/netfilter/nf_conntrack_bridge.c
+++ b/net/bridge/netfilter/nf_conntrack_bridge.c
@@ -366,42 +366,12 @@ static int nf_ct_bridge_refrag_post(struct net *net, struct sock *sk,
return br_dev_queue_push_xmit(net, sk, skb);
}
-static unsigned int nf_ct_bridge_confirm(struct sk_buff *skb)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
- int protoff;
-
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct || ctinfo == IP_CT_RELATED_REPLY)
- return nf_conntrack_confirm(skb);
-
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- protoff = skb_network_offset(skb) + ip_hdrlen(skb);
- break;
- case htons(ETH_P_IPV6): {
- unsigned char pnum = ipv6_hdr(skb)->nexthdr;
- __be16 frag_off;
-
- protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
- &frag_off);
- if (protoff < 0 || (frag_off & htons(~0x7)) != 0)
- return nf_conntrack_confirm(skb);
- }
- break;
- default:
- return NF_ACCEPT;
- }
- return nf_confirm(skb, protoff, ct, ctinfo);
-}
-
static unsigned int nf_ct_bridge_post(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
int ret;
- ret = nf_ct_bridge_confirm(skb);
+ ret = nf_confirm(priv, skb, state);
if (ret != NF_ACCEPT)
return ret;
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 895b09cbd7cf..99323fb12d0f 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -121,17 +121,61 @@ const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
};
EXPORT_SYMBOL_GPL(nf_ct_l4proto_find);
-unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+static bool in_vrf_postrouting(const struct nf_hook_state *state)
+{
+#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
+ if (state->hook == NF_INET_POST_ROUTING &&
+ netif_is_l3_master(state->out))
+ return true;
+#endif
+ return false;
+}
+
+unsigned int nf_confirm(void *priv,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
{
const struct nf_conn_help *help;
+ enum ip_conntrack_info ctinfo;
+ unsigned int protoff;
+ struct nf_conn *ct;
+ bool seqadj_needed;
+ __be16 frag_off;
+ u8 pnum;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (!ct || in_vrf_postrouting(state))
+ return NF_ACCEPT;
help = nfct_help(ct);
+
+ seqadj_needed = test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_is_loopback_packet(skb);
+ if (!help && !seqadj_needed)
+ return nf_conntrack_confirm(skb);
+
+ /* helper->help() do not expect ICMP packets */
+ if (ctinfo == IP_CT_RELATED_REPLY)
+ return nf_conntrack_confirm(skb);
+
+ switch (nf_ct_l3num(ct)) {
+ case NFPROTO_IPV4:
+ protoff = skb_network_offset(skb) + ip_hdrlen(skb);
+ break;
+ case NFPROTO_IPV6:
+ pnum = ipv6_hdr(skb)->nexthdr;
+ protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum, &frag_off);
+ if (protoff < 0 || (frag_off & htons(~0x7)) != 0)
+ return nf_conntrack_confirm(skb);
+ break;
+ default:
+ return nf_conntrack_confirm(skb);
+ }
+
if (help) {
const struct nf_conntrack_helper *helper;
int ret;
- /* rcu_read_lock()ed by nf_hook_thresh */
+ /* rcu_read_lock()ed by nf_hook */
helper = rcu_dereference(help->helper);
if (helper) {
ret = helper->help(skb,
@@ -142,12 +186,10 @@ unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
}
}
- if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
- !nf_is_loopback_packet(skb)) {
- if (!nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
- NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
- return NF_DROP;
- }
+ if (seqadj_needed &&
+ !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
+ NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
+ return NF_DROP;
}
/* We've seen it coming out the other side: confirm it */
@@ -155,35 +197,6 @@ unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
}
EXPORT_SYMBOL_GPL(nf_confirm);
-static bool in_vrf_postrouting(const struct nf_hook_state *state)
-{
-#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
- if (state->hook == NF_INET_POST_ROUTING &&
- netif_is_l3_master(state->out))
- return true;
-#endif
- return false;
-}
-
-static unsigned int ipv4_confirm(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state)
-{
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
-
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct || ctinfo == IP_CT_RELATED_REPLY)
- return nf_conntrack_confirm(skb);
-
- if (in_vrf_postrouting(state))
- return NF_ACCEPT;
-
- return nf_confirm(skb,
- skb_network_offset(skb) + ip_hdrlen(skb),
- ct, ctinfo);
-}
-
static unsigned int ipv4_conntrack_in(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
@@ -230,13 +243,13 @@ static const struct nf_hook_ops ipv4_conntrack_ops[] = {
.priority = NF_IP_PRI_CONNTRACK,
},
{
- .hook = ipv4_confirm,
+ .hook = nf_confirm,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
},
{
- .hook = ipv4_confirm,
+ .hook = nf_confirm,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
@@ -373,33 +386,6 @@ static struct nf_sockopt_ops so_getorigdst6 = {
.owner = THIS_MODULE,
};
-static unsigned int ipv6_confirm(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state)
-{
- struct nf_conn *ct;
- enum ip_conntrack_info ctinfo;
- unsigned char pnum = ipv6_hdr(skb)->nexthdr;
- __be16 frag_off;
- int protoff;
-
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct || ctinfo == IP_CT_RELATED_REPLY)
- return nf_conntrack_confirm(skb);
-
- if (in_vrf_postrouting(state))
- return NF_ACCEPT;
-
- protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
- &frag_off);
- if (protoff < 0 || (frag_off & htons(~0x7)) != 0) {
- pr_debug("proto header not found\n");
- return nf_conntrack_confirm(skb);
- }
-
- return nf_confirm(skb, protoff, ct, ctinfo);
-}
-
static unsigned int ipv6_conntrack_in(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
@@ -428,13 +414,13 @@ static const struct nf_hook_ops ipv6_conntrack_ops[] = {
.priority = NF_IP6_PRI_CONNTRACK,
},
{
- .hook = ipv6_confirm,
+ .hook = nf_confirm,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP6_PRI_LAST,
},
{
- .hook = ipv6_confirm,
+ .hook = nf_confirm,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_LAST - 1,
--
2.30.2
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