1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Header for use in defining a given L4 protocol for connection tracking.
5 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
6 * - generalized L3 protocol dependent part.
8 * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
11 #ifndef _NF_CONNTRACK_L4PROTO_H
12 #define _NF_CONNTRACK_L4PROTO_H
13 #include <linux/netlink.h>
14 #include <net/netlink.h>
15 #include <net/netfilter/nf_conntrack.h>
16 #include <net/netns/generic.h>
20 struct nf_conntrack_l4proto {
21 /* L4 Protocol number. */
24 /* Resolve clashes on insertion races. */
27 /* protoinfo nlattr size, closes a hole */
30 /* called by gc worker if table is full */
31 bool (*can_early_drop)(const struct nf_conn *ct);
33 /* convert protoinfo to nfnetink attributes */
34 int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
37 /* convert nfnetlink attributes to protoinfo */
38 int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
40 int (*tuple_to_nlattr)(struct sk_buff *skb,
41 const struct nf_conntrack_tuple *t);
42 /* Calculate tuple nlattr size */
43 unsigned int (*nlattr_tuple_size)(void);
44 int (*nlattr_to_tuple)(struct nlattr *tb[],
45 struct nf_conntrack_tuple *t);
46 const struct nla_policy *nla_policy;
49 int (*nlattr_to_obj)(struct nlattr *tb[],
50 struct net *net, void *data);
51 int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
55 const struct nla_policy *nla_policy;
57 #ifdef CONFIG_NF_CONNTRACK_PROCFS
58 /* Print out the private part of the conntrack. */
59 void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
63 bool icmp_pkt_to_tuple(const struct sk_buff *skb,
66 struct nf_conntrack_tuple *tuple);
68 bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
71 struct nf_conntrack_tuple *tuple);
73 bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
74 const struct nf_conntrack_tuple *orig);
75 bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
76 const struct nf_conntrack_tuple *orig);
78 int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
81 const struct nf_hook_state *state);
83 int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
86 const struct nf_hook_state *state);
88 int nf_conntrack_icmp_packet(struct nf_conn *ct,
90 enum ip_conntrack_info ctinfo,
91 const struct nf_hook_state *state);
93 int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
95 enum ip_conntrack_info ctinfo,
96 const struct nf_hook_state *state);
98 int nf_conntrack_udp_packet(struct nf_conn *ct,
100 unsigned int dataoff,
101 enum ip_conntrack_info ctinfo,
102 const struct nf_hook_state *state);
103 int nf_conntrack_udplite_packet(struct nf_conn *ct,
105 unsigned int dataoff,
106 enum ip_conntrack_info ctinfo,
107 const struct nf_hook_state *state);
108 int nf_conntrack_tcp_packet(struct nf_conn *ct,
110 unsigned int dataoff,
111 enum ip_conntrack_info ctinfo,
112 const struct nf_hook_state *state);
113 int nf_conntrack_dccp_packet(struct nf_conn *ct,
115 unsigned int dataoff,
116 enum ip_conntrack_info ctinfo,
117 const struct nf_hook_state *state);
118 int nf_conntrack_sctp_packet(struct nf_conn *ct,
120 unsigned int dataoff,
121 enum ip_conntrack_info ctinfo,
122 const struct nf_hook_state *state);
123 int nf_conntrack_gre_packet(struct nf_conn *ct,
125 unsigned int dataoff,
126 enum ip_conntrack_info ctinfo,
127 const struct nf_hook_state *state);
129 void nf_conntrack_generic_init_net(struct net *net);
130 void nf_conntrack_tcp_init_net(struct net *net);
131 void nf_conntrack_udp_init_net(struct net *net);
132 void nf_conntrack_gre_init_net(struct net *net);
133 void nf_conntrack_dccp_init_net(struct net *net);
134 void nf_conntrack_sctp_init_net(struct net *net);
135 void nf_conntrack_icmp_init_net(struct net *net);
136 void nf_conntrack_icmpv6_init_net(struct net *net);
138 /* Existing built-in generic protocol */
139 extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
141 #define MAX_NF_CT_PROTO IPPROTO_UDPLITE
143 const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
145 /* Generic netlink helpers */
146 int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
147 const struct nf_conntrack_tuple *tuple);
148 int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
149 struct nf_conntrack_tuple *t);
150 unsigned int nf_ct_port_nlattr_tuple_size(void);
151 extern const struct nla_policy nf_ct_port_nla_policy[];
154 __printf(3, 4) __cold
155 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
156 const struct nf_conn *ct,
157 const char *fmt, ...);
158 __printf(5, 6) __cold
159 void nf_l4proto_log_invalid(const struct sk_buff *skb,
162 const char *fmt, ...);
164 static inline __printf(5, 6) __cold
165 void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
166 u16 pf, u8 protonum, const char *fmt, ...) {}
167 static inline __printf(3, 4) __cold
168 void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
169 const struct nf_conn *ct,
170 const char *fmt, ...) { }
171 #endif /* CONFIG_SYSCTL */
173 static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
175 return &net->ct.nf_ct_proto.generic;
178 static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
180 return &net->ct.nf_ct_proto.tcp;
183 static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
185 return &net->ct.nf_ct_proto.udp;
188 static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
190 return &net->ct.nf_ct_proto.icmp;
193 static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
195 return &net->ct.nf_ct_proto.icmpv6;
198 #ifdef CONFIG_NF_CT_PROTO_DCCP
199 static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
201 return &net->ct.nf_ct_proto.dccp;
205 #ifdef CONFIG_NF_CT_PROTO_SCTP
206 static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
208 return &net->ct.nf_ct_proto.sctp;
212 #ifdef CONFIG_NF_CT_PROTO_GRE
213 static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
215 return &net->ct.nf_ct_proto.gre;
219 #endif /*_NF_CONNTRACK_PROTOCOL_H*/