Similar to nf_nat_ovs created by Commit ebddb1404900 ("net: move the
nat function to nf_nat_ovs for ovs and tc"), this patch is to create
nf_conntrack_ovs to get these functions shared by OVS and TC only.
There are nf_ct_helper() and nf_ct_add_helper() from nf_conntrak_helper
in this patch, and will be more in the following patches.
Signed-off-by: Xin Long <lucien....@gmail.com>
---
net/netfilter/Kconfig | 3 +
net/netfilter/Makefile | 1 +
net/netfilter/nf_conntrack_helper.c | 98 --------------------------
net/netfilter/nf_conntrack_ovs.c | 104 ++++++++++++++++++++++++++++
net/openvswitch/Kconfig | 1 +
net/sched/Kconfig | 1 +
6 files changed, 110 insertions(+), 98 deletions(-)
create mode 100644 net/netfilter/nf_conntrack_ovs.c
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f71b41c7ce2f..4d6737160857 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -189,6 +189,9 @@ config NF_CONNTRACK_LABELS
to connection tracking entries. It can be used with xtables connlabel
match and the nftables ct expression.
+config NF_CONNTRACK_OVS
+ bool
+
config NF_CT_PROTO_DCCP
bool 'DCCP protocol connection tracking support'
depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index ba2a6b5e93d9..5ffef1cd6143 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -11,6 +11,7 @@ nf_conntrack-$(CONFIG_NF_CONNTRACK_TIMEOUT) +=
nf_conntrack_timeout.o
nf_conntrack-$(CONFIG_NF_CONNTRACK_TIMESTAMP) += nf_conntrack_timestamp.o
nf_conntrack-$(CONFIG_NF_CONNTRACK_EVENTS) += nf_conntrack_ecache.o
nf_conntrack-$(CONFIG_NF_CONNTRACK_LABELS) += nf_conntrack_labels.o
+nf_conntrack-$(CONFIG_NF_CONNTRACK_OVS) += nf_conntrack_ovs.o
nf_conntrack-$(CONFIG_NF_CT_PROTO_DCCP) += nf_conntrack_proto_dccp.o
nf_conntrack-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
nf_conntrack-$(CONFIG_NF_CT_PROTO_GRE) += nf_conntrack_proto_gre.o
diff --git a/net/netfilter/nf_conntrack_helper.c
b/net/netfilter/nf_conntrack_helper.c
index 48ea6d0264b5..0c4db2f2ac43 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -242,104 +242,6 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct
nf_conn *tmpl,
}
EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper);
-/* 'skb' should already be pulled to nh_ofs. */
-int nf_ct_helper(struct sk_buff *skb, struct nf_conn *ct,
- enum ip_conntrack_info ctinfo, u16 proto)
-{
- const struct nf_conntrack_helper *helper;
- const struct nf_conn_help *help;
- unsigned int protoff;
- int err;
-
- if (ctinfo == IP_CT_RELATED_REPLY)
- return NF_ACCEPT;
-
- help = nfct_help(ct);
- if (!help)
- return NF_ACCEPT;
-
- helper = rcu_dereference(help->helper);
- if (!helper)
- return NF_ACCEPT;
-
- if (helper->tuple.src.l3num != NFPROTO_UNSPEC &&
- helper->tuple.src.l3num != proto)
- return NF_ACCEPT;
-
- switch (proto) {
- case NFPROTO_IPV4:
- protoff = ip_hdrlen(skb);
- proto = ip_hdr(skb)->protocol;
- break;
- case NFPROTO_IPV6: {
- u8 nexthdr = ipv6_hdr(skb)->nexthdr;
- __be16 frag_off;
- int ofs;
-
- ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
- &frag_off);
- if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
- pr_debug("proto header not found\n");
- return NF_ACCEPT;
- }
- protoff = ofs;
- proto = nexthdr;
- break;
- }
- default:
- WARN_ONCE(1, "helper invoked on non-IP family!");
- return NF_DROP;
- }
-
- if (helper->tuple.dst.protonum != proto)
- return NF_ACCEPT;
-
- err = helper->help(skb, protoff, ct, ctinfo);
- if (err != NF_ACCEPT)
- return err;
-
- /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
- * FTP with NAT) adusting the TCP payload size when mangling IP
- * addresses and/or port numbers in the text-based control connection.
- */
- if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
- !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
- return NF_DROP;
- return NF_ACCEPT;
-}
-EXPORT_SYMBOL_GPL(nf_ct_helper);
-
-int nf_ct_add_helper(struct nf_conn *ct, const char *name, u8 family,
- u8 proto, bool nat, struct nf_conntrack_helper **hp)
-{
- struct nf_conntrack_helper *helper;
- struct nf_conn_help *help;
- int ret = 0;
-
- helper = nf_conntrack_helper_try_module_get(name, family, proto);
- if (!helper)
- return -EINVAL;
-
- help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
- if (!help) {
- nf_conntrack_helper_put(helper);
- return -ENOMEM;
- }
-#if IS_ENABLED(CONFIG_NF_NAT)
- if (nat) {
- ret = nf_nat_helper_try_module_get(name, family, proto);
- if (ret) {
- nf_conntrack_helper_put(helper);
- return ret;
- }
- }
-#endif
- rcu_assign_pointer(help->helper, helper);
- *hp = helper;
- return ret;
-}
-EXPORT_SYMBOL_GPL(nf_ct_add_helper);
-
/* appropriate ct lock protecting must be taken by caller */
static int unhelp(struct nf_conn *ct, void *me)
{
diff --git a/net/netfilter/nf_conntrack_ovs.c b/net/netfilter/nf_conntrack_ovs.c
new file mode 100644
index 000000000000..eff4d53f8b8c
--- /dev/null
+++ b/net/netfilter/nf_conntrack_ovs.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Support ct functions for openvswitch and used by OVS and TC conntrack. */
+
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_seqadj.h>
+#include <net/ip.h>
+
+/* 'skb' should already be pulled to nh_ofs. */
+int nf_ct_helper(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo, u16 proto)
+{
+ const struct nf_conntrack_helper *helper;
+ const struct nf_conn_help *help;
+ unsigned int protoff;
+ int err;
+
+ if (ctinfo == IP_CT_RELATED_REPLY)
+ return NF_ACCEPT;
+
+ help = nfct_help(ct);
+ if (!help)
+ return NF_ACCEPT;
+
+ helper = rcu_dereference(help->helper);
+ if (!helper)
+ return NF_ACCEPT;
+
+ if (helper->tuple.src.l3num != NFPROTO_UNSPEC &&
+ helper->tuple.src.l3num != proto)
+ return NF_ACCEPT;
+
+ switch (proto) {
+ case NFPROTO_IPV4:
+ protoff = ip_hdrlen(skb);
+ proto = ip_hdr(skb)->protocol;
+ break;
+ case NFPROTO_IPV6: {
+ u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ __be16 frag_off;
+ int ofs;
+
+ ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
+ &frag_off);
+ if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
+ pr_debug("proto header not found\n");
+ return NF_ACCEPT;
+ }
+ protoff = ofs;
+ proto = nexthdr;
+ break;
+ }
+ default:
+ WARN_ONCE(1, "helper invoked on non-IP family!");
+ return NF_DROP;
+ }
+
+ if (helper->tuple.dst.protonum != proto)
+ return NF_ACCEPT;
+
+ err = helper->help(skb, protoff, ct, ctinfo);
+ if (err != NF_ACCEPT)
+ return err;
+
+ /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
+ * FTP with NAT) adusting the TCP payload size when mangling IP
+ * addresses and/or port numbers in the text-based control connection.
+ */
+ if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
+ !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
+ return NF_DROP;
+ return NF_ACCEPT;
+}
+EXPORT_SYMBOL_GPL(nf_ct_helper);
+
+int nf_ct_add_helper(struct nf_conn *ct, const char *name, u8 family,
+ u8 proto, bool nat, struct nf_conntrack_helper **hp)
+{
+ struct nf_conntrack_helper *helper;
+ struct nf_conn_help *help;
+ int ret = 0;
+
+ helper = nf_conntrack_helper_try_module_get(name, family, proto);
+ if (!helper)
+ return -EINVAL;
+
+ help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
+ if (!help) {
+ nf_conntrack_helper_put(helper);
+ return -ENOMEM;
+ }
+#if IS_ENABLED(CONFIG_NF_NAT)
+ if (nat) {
+ ret = nf_nat_helper_try_module_get(name, family, proto);
+ if (ret) {
+ nf_conntrack_helper_put(helper);
+ return ret;
+ }
+ }
+#endif
+ rcu_assign_pointer(help->helper, helper);
+ *hp = helper;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_ct_add_helper);
diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
index 747d537a3f06..29a7081858cd 100644
--- a/net/openvswitch/Kconfig
+++ b/net/openvswitch/Kconfig
@@ -15,6 +15,7 @@ config OPENVSWITCH
select NET_MPLS_GSO
select DST_CACHE
select NET_NSH
+ select NF_CONNTRACK_OVS if NF_CONNTRACK
select NF_NAT_OVS if NF_NAT
help
Open vSwitch is a multilayer Ethernet switch targeted at virtualized
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index f5acb535413d..4f7b52f5a11c 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -984,6 +984,7 @@ config NET_ACT_TUNNEL_KEY
config NET_ACT_CT
tristate "connection tracking tc action"
depends on NET_CLS_ACT && NF_CONNTRACK && (!NF_NAT || NF_NAT) &&
NF_FLOW_TABLE
+ select NF_CONNTRACK_OVS
select NF_NAT_OVS if NF_NAT
help
Say Y here to allow sending the packets to conntrack module.
--
2.31.1
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