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-rw-r--r--include/net/netfilter/nf_conntrack_l4proto.h247
1 files changed, 247 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
new file mode 100644
index 000000000..1f47bef51
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -0,0 +1,247 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header for use in defining a given L4 protocol for connection tracking.
+ *
+ * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
+ * - generalized L3 protocol dependent part.
+ *
+ * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
+ */
+
+#ifndef _NF_CONNTRACK_L4PROTO_H
+#define _NF_CONNTRACK_L4PROTO_H
+#include <linux/netlink.h>
+#include <net/netlink.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netns/generic.h>
+
+struct seq_file;
+
+struct nf_conntrack_l4proto {
+ /* L4 Protocol number. */
+ u_int8_t l4proto;
+
+ /* Resolve clashes on insertion races. */
+ bool allow_clash;
+
+ /* protoinfo nlattr size, closes a hole */
+ u16 nlattr_size;
+
+ /* called by gc worker if table is full */
+ bool (*can_early_drop)(const struct nf_conn *ct);
+
+ /* convert protoinfo to nfnetink attributes */
+ int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
+ struct nf_conn *ct, bool destroy);
+
+ /* convert nfnetlink attributes to protoinfo */
+ int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
+
+ int (*tuple_to_nlattr)(struct sk_buff *skb,
+ const struct nf_conntrack_tuple *t);
+ /* Calculate tuple nlattr size */
+ unsigned int (*nlattr_tuple_size)(void);
+ int (*nlattr_to_tuple)(struct nlattr *tb[],
+ struct nf_conntrack_tuple *t,
+ u_int32_t flags);
+ const struct nla_policy *nla_policy;
+
+ struct {
+ int (*nlattr_to_obj)(struct nlattr *tb[],
+ struct net *net, void *data);
+ int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
+
+ u16 obj_size;
+ u16 nlattr_max;
+ const struct nla_policy *nla_policy;
+ } ctnl_timeout;
+#ifdef CONFIG_NF_CONNTRACK_PROCFS
+ /* Print out the private part of the conntrack. */
+ void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
+#endif
+};
+
+bool icmp_pkt_to_tuple(const struct sk_buff *skb,
+ unsigned int dataoff,
+ struct net *net,
+ struct nf_conntrack_tuple *tuple);
+
+bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
+ unsigned int dataoff,
+ struct net *net,
+ struct nf_conntrack_tuple *tuple);
+
+bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_conntrack_tuple *orig);
+bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_conntrack_tuple *orig);
+
+int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
+ unsigned int dataoff,
+ const struct nf_hook_state *state,
+ u8 l4proto,
+ union nf_inet_addr *outer_daddr);
+
+int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ const struct nf_hook_state *state);
+
+int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ const struct nf_hook_state *state);
+
+int nf_conntrack_icmp_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+
+int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+
+int nf_conntrack_udp_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+int nf_conntrack_udplite_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+int nf_conntrack_tcp_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+int nf_conntrack_dccp_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+int nf_conntrack_sctp_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+int nf_conntrack_gre_packet(struct nf_conn *ct,
+ struct sk_buff *skb,
+ unsigned int dataoff,
+ enum ip_conntrack_info ctinfo,
+ const struct nf_hook_state *state);
+
+void nf_conntrack_generic_init_net(struct net *net);
+void nf_conntrack_tcp_init_net(struct net *net);
+void nf_conntrack_udp_init_net(struct net *net);
+void nf_conntrack_gre_init_net(struct net *net);
+void nf_conntrack_dccp_init_net(struct net *net);
+void nf_conntrack_sctp_init_net(struct net *net);
+void nf_conntrack_icmp_init_net(struct net *net);
+void nf_conntrack_icmpv6_init_net(struct net *net);
+
+/* Existing built-in generic protocol */
+extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
+
+#define MAX_NF_CT_PROTO IPPROTO_UDPLITE
+
+const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
+
+/* Generic netlink helpers */
+int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
+ const struct nf_conntrack_tuple *tuple);
+int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
+ struct nf_conntrack_tuple *t,
+ u_int32_t flags);
+unsigned int nf_ct_port_nlattr_tuple_size(void);
+extern const struct nla_policy nf_ct_port_nla_policy[];
+
+#ifdef CONFIG_SYSCTL
+__printf(4, 5) __cold
+void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
+ const struct nf_conn *ct,
+ const struct nf_hook_state *state,
+ const char *fmt, ...);
+__printf(4, 5) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb,
+ const struct nf_hook_state *state,
+ u8 protonum,
+ const char *fmt, ...);
+#else
+static inline __printf(4, 5) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb,
+ const struct nf_hook_state *state,
+ u8 protonum,
+ const char *fmt, ...) {}
+static inline __printf(4, 5) __cold
+void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
+ const struct nf_conn *ct,
+ const struct nf_hook_state *state,
+ const char *fmt, ...) { }
+#endif /* CONFIG_SYSCTL */
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.generic;
+}
+
+static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.tcp;
+}
+
+static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.udp;
+}
+
+static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.icmp;
+}
+
+static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.icmpv6;
+}
+
+/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */
+static inline void nf_ct_set_tcp_be_liberal(struct nf_conn *ct)
+{
+ ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
+ ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
+}
+
+/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */
+static inline bool nf_conntrack_tcp_established(const struct nf_conn *ct)
+{
+ return ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED &&
+ test_bit(IPS_ASSURED_BIT, &ct->status);
+}
+#endif
+
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.dccp;
+}
+#endif
+
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.sctp;
+}
+#endif
+
+#ifdef CONFIG_NF_CT_PROTO_GRE
+static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
+{
+ return &net->ct.nf_ct_proto.gre;
+}
+#endif
+
+#endif /*_NF_CONNTRACK_PROTOCOL_H*/
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