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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>
17
18struct seq_file;
19
20struct nf_conntrack_l4proto {
21
22 u_int8_t l4proto;
23
24
25 bool allow_clash;
26
27
28 u16 nlattr_size;
29
30
31 bool (*can_early_drop)(const struct nf_conn *ct);
32
33
34 int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
35 struct nf_conn *ct);
36
37
38 int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
39
40 int (*tuple_to_nlattr)(struct sk_buff *skb,
41 const struct nf_conntrack_tuple *t);
42
43 unsigned int (*nlattr_tuple_size)(void);
44 int (*nlattr_to_tuple)(struct nlattr *tb[],
45 struct nf_conntrack_tuple *t,
46 u_int32_t flags);
47 const struct nla_policy *nla_policy;
48
49 struct {
50 int (*nlattr_to_obj)(struct nlattr *tb[],
51 struct net *net, void *data);
52 int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
53
54 u16 obj_size;
55 u16 nlattr_max;
56 const struct nla_policy *nla_policy;
57 } ctnl_timeout;
58#ifdef CONFIG_NF_CONNTRACK_PROCFS
59
60 void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
61#endif
62};
63
64bool icmp_pkt_to_tuple(const struct sk_buff *skb,
65 unsigned int dataoff,
66 struct net *net,
67 struct nf_conntrack_tuple *tuple);
68
69bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
70 unsigned int dataoff,
71 struct net *net,
72 struct nf_conntrack_tuple *tuple);
73
74bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
75 const struct nf_conntrack_tuple *orig);
76bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
77 const struct nf_conntrack_tuple *orig);
78
79int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
80 unsigned int dataoff,
81 const struct nf_hook_state *state,
82 u8 l4proto,
83 union nf_inet_addr *outer_daddr);
84
85int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
86 struct sk_buff *skb,
87 unsigned int dataoff,
88 const struct nf_hook_state *state);
89
90int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
91 struct sk_buff *skb,
92 unsigned int dataoff,
93 const struct nf_hook_state *state);
94
95int nf_conntrack_icmp_packet(struct nf_conn *ct,
96 struct sk_buff *skb,
97 enum ip_conntrack_info ctinfo,
98 const struct nf_hook_state *state);
99
100int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
101 struct sk_buff *skb,
102 enum ip_conntrack_info ctinfo,
103 const struct nf_hook_state *state);
104
105int nf_conntrack_udp_packet(struct nf_conn *ct,
106 struct sk_buff *skb,
107 unsigned int dataoff,
108 enum ip_conntrack_info ctinfo,
109 const struct nf_hook_state *state);
110int nf_conntrack_udplite_packet(struct nf_conn *ct,
111 struct sk_buff *skb,
112 unsigned int dataoff,
113 enum ip_conntrack_info ctinfo,
114 const struct nf_hook_state *state);
115int nf_conntrack_tcp_packet(struct nf_conn *ct,
116 struct sk_buff *skb,
117 unsigned int dataoff,
118 enum ip_conntrack_info ctinfo,
119 const struct nf_hook_state *state);
120int nf_conntrack_dccp_packet(struct nf_conn *ct,
121 struct sk_buff *skb,
122 unsigned int dataoff,
123 enum ip_conntrack_info ctinfo,
124 const struct nf_hook_state *state);
125int nf_conntrack_sctp_packet(struct nf_conn *ct,
126 struct sk_buff *skb,
127 unsigned int dataoff,
128 enum ip_conntrack_info ctinfo,
129 const struct nf_hook_state *state);
130int nf_conntrack_gre_packet(struct nf_conn *ct,
131 struct sk_buff *skb,
132 unsigned int dataoff,
133 enum ip_conntrack_info ctinfo,
134 const struct nf_hook_state *state);
135
136void nf_conntrack_generic_init_net(struct net *net);
137void nf_conntrack_tcp_init_net(struct net *net);
138void nf_conntrack_udp_init_net(struct net *net);
139void nf_conntrack_gre_init_net(struct net *net);
140void nf_conntrack_dccp_init_net(struct net *net);
141void nf_conntrack_sctp_init_net(struct net *net);
142void nf_conntrack_icmp_init_net(struct net *net);
143void nf_conntrack_icmpv6_init_net(struct net *net);
144
145
146extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
147
148#define MAX_NF_CT_PROTO IPPROTO_UDPLITE
149
150const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
151
152
153int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
154 const struct nf_conntrack_tuple *tuple);
155int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
156 struct nf_conntrack_tuple *t,
157 u_int32_t flags);
158unsigned int nf_ct_port_nlattr_tuple_size(void);
159extern const struct nla_policy nf_ct_port_nla_policy[];
160
161#ifdef CONFIG_SYSCTL
162__printf(3, 4) __cold
163void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
164 const struct nf_conn *ct,
165 const char *fmt, ...);
166__printf(5, 6) __cold
167void nf_l4proto_log_invalid(const struct sk_buff *skb,
168 struct net *net,
169 u16 pf, u8 protonum,
170 const char *fmt, ...);
171#else
172static inline __printf(5, 6) __cold
173void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
174 u16 pf, u8 protonum, const char *fmt, ...) {}
175static inline __printf(3, 4) __cold
176void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
177 const struct nf_conn *ct,
178 const char *fmt, ...) { }
179#endif
180
181#if IS_ENABLED(CONFIG_NF_CONNTRACK)
182static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
183{
184 return &net->ct.nf_ct_proto.generic;
185}
186
187static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
188{
189 return &net->ct.nf_ct_proto.tcp;
190}
191
192static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
193{
194 return &net->ct.nf_ct_proto.udp;
195}
196
197static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
198{
199 return &net->ct.nf_ct_proto.icmp;
200}
201
202static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
203{
204 return &net->ct.nf_ct_proto.icmpv6;
205}
206#endif
207
208#ifdef CONFIG_NF_CT_PROTO_DCCP
209static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
210{
211 return &net->ct.nf_ct_proto.dccp;
212}
213#endif
214
215#ifdef CONFIG_NF_CT_PROTO_SCTP
216static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
217{
218 return &net->ct.nf_ct_proto.sctp;
219}
220#endif
221
222#ifdef CONFIG_NF_CT_PROTO_GRE
223static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
224{
225 return &net->ct.nf_ct_proto.gre;
226}
227#endif
228
229#endif
230