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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9fb9cbb1 | 2 | /* |
605dcad6 | 3 | * Header for use in defining a given L4 protocol for connection tracking. |
9fb9cbb1 YK |
4 | * |
5 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
6 | * - generalized L3 protocol dependent part. | |
7 | * | |
8 | * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h | |
9 | */ | |
10 | ||
605dcad6 MJ |
11 | #ifndef _NF_CONNTRACK_L4PROTO_H |
12 | #define _NF_CONNTRACK_L4PROTO_H | |
df6fb868 | 13 | #include <linux/netlink.h> |
f73e924c | 14 | #include <net/netlink.h> |
9fb9cbb1 | 15 | #include <net/netfilter/nf_conntrack.h> |
2c352f44 | 16 | #include <net/netns/generic.h> |
9fb9cbb1 YK |
17 | |
18 | struct seq_file; | |
19 | ||
fd2c3ef7 | 20 | struct nf_conntrack_l4proto { |
9fb9cbb1 YK |
21 | /* L3 Protocol number. */ |
22 | u_int16_t l3proto; | |
23 | ||
605dcad6 MJ |
24 | /* L4 Protocol number. */ |
25 | u_int8_t l4proto; | |
9fb9cbb1 | 26 | |
71d8c47f PNA |
27 | /* Resolve clashes on insertion races. */ |
28 | bool allow_clash; | |
29 | ||
39215846 FW |
30 | /* protoinfo nlattr size, closes a hole */ |
31 | u16 nlattr_size; | |
32 | ||
9fb9cbb1 YK |
33 | /* Try to fill in the third arg: dataoff is offset past network protocol |
34 | hdr. Return true if possible. */ | |
09f263cd | 35 | bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, |
a31f1adc | 36 | struct net *net, struct nf_conntrack_tuple *tuple); |
9fb9cbb1 YK |
37 | |
38 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. | |
8b3892ea | 39 | * Only used by icmp, most protocols use a generic version. |
9fb9cbb1 | 40 | */ |
09f263cd JE |
41 | bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
42 | const struct nf_conntrack_tuple *orig); | |
9fb9cbb1 | 43 | |
9fb9cbb1 | 44 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 45 | int (*packet)(struct nf_conn *ct, |
83d213fd | 46 | struct sk_buff *skb, |
9fb9cbb1 | 47 | unsigned int dataoff, |
93e66024 FW |
48 | enum ip_conntrack_info ctinfo, |
49 | const struct nf_hook_state *state); | |
9fb9cbb1 | 50 | |
9fb9cbb1 | 51 | /* Called when a conntrack entry is destroyed */ |
c88130bc | 52 | void (*destroy)(struct nf_conn *ct); |
9fb9cbb1 | 53 | |
93e66024 | 54 | int (*error)(struct nf_conn *tmpl, struct sk_buff *skb, |
11df4b76 | 55 | unsigned int dataoff, |
93e66024 | 56 | const struct nf_hook_state *state); |
9fb9cbb1 | 57 | |
c6dd940b FW |
58 | /* called by gc worker if table is full */ |
59 | bool (*can_early_drop)(const struct nf_conn *ct); | |
60 | ||
c1d10adb | 61 | /* convert protoinfo to nfnetink attributes */ |
fdf70832 | 62 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 63 | struct nf_conn *ct); |
c1d10adb PNA |
64 | |
65 | /* convert nfnetlink attributes to protoinfo */ | |
fdf70832 | 66 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
c1d10adb | 67 | |
fdf70832 | 68 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
c1d10adb | 69 | const struct nf_conntrack_tuple *t); |
d0dba725 | 70 | /* Calculate tuple nlattr size */ |
5caaed15 | 71 | unsigned int (*nlattr_tuple_size)(void); |
fdf70832 | 72 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
c1d10adb | 73 | struct nf_conntrack_tuple *t); |
f73e924c | 74 | const struct nla_policy *nla_policy; |
c1d10adb | 75 | |
50978462 | 76 | struct { |
8264deb8 G |
77 | int (*nlattr_to_obj)(struct nlattr *tb[], |
78 | struct net *net, void *data); | |
50978462 PNA |
79 | int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); |
80 | ||
036c6940 FW |
81 | u16 obj_size; |
82 | u16 nlattr_max; | |
50978462 PNA |
83 | const struct nla_policy *nla_policy; |
84 | } ctnl_timeout; | |
ea48cc83 FW |
85 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
86 | /* Print out the private part of the conntrack. */ | |
87 | void (*print_conntrack)(struct seq_file *s, struct nf_conn *); | |
a999e683 | 88 | #endif |
c7d03a00 | 89 | unsigned int *net_id; |
2c352f44 | 90 | /* Init l4proto pernet data */ |
f1caad27 | 91 | int (*init_net)(struct net *net, u_int16_t proto); |
2c352f44 | 92 | |
08911475 PNA |
93 | /* Return the per-net protocol part. */ |
94 | struct nf_proto_net *(*get_net_proto)(struct net *net); | |
95 | ||
9fb9cbb1 YK |
96 | /* Module (if any) which this is connected to. */ |
97 | struct module *me; | |
98 | }; | |
99 | ||
9d2493f8 | 100 | /* Existing built-in generic protocol */ |
9dae47ab | 101 | extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
9fb9cbb1 YK |
102 | |
103 | #define MAX_NF_CT_PROTO 256 | |
9fb9cbb1 | 104 | |
b3480fe0 | 105 | const struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto, |
4e77be46 | 106 | u_int8_t l4proto); |
c1d10adb | 107 | |
b3480fe0 | 108 | const struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto, |
4e77be46 | 109 | u_int8_t l4proto); |
2a04aabf | 110 | void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p); |
c1ebd7df | 111 | |
c296bb4d | 112 | /* Protocol pernet registration. */ |
0e54d217 | 113 | int nf_ct_l4proto_pernet_register_one(struct net *net, |
2a04aabf | 114 | const struct nf_conntrack_l4proto *proto); |
0e54d217 | 115 | void nf_ct_l4proto_pernet_unregister_one(struct net *net, |
2a04aabf | 116 | const struct nf_conntrack_l4proto *proto); |
4e77be46 | 117 | int nf_ct_l4proto_pernet_register(struct net *net, |
cd9ceafc | 118 | const struct nf_conntrack_l4proto *const proto[], |
0e54d217 | 119 | unsigned int num_proto); |
4e77be46 | 120 | void nf_ct_l4proto_pernet_unregister(struct net *net, |
cd9ceafc | 121 | const struct nf_conntrack_l4proto *const proto[], |
2a04aabf | 122 | unsigned int num_proto); |
9fb9cbb1 | 123 | |
c296bb4d | 124 | /* Protocol global registration. */ |
cd9ceafc | 125 | int nf_ct_l4proto_register_one(const struct nf_conntrack_l4proto *proto); |
2a04aabf | 126 | void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *proto); |
c296bb4d | 127 | |
c1d10adb | 128 | /* Generic netlink helpers */ |
4e77be46 JP |
129 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
130 | const struct nf_conntrack_tuple *tuple); | |
131 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], | |
132 | struct nf_conntrack_tuple *t); | |
5caaed15 | 133 | unsigned int nf_ct_port_nlattr_tuple_size(void); |
f73e924c | 134 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
c1d10adb | 135 | |
9fb9cbb1 | 136 | #ifdef CONFIG_SYSCTL |
3d0b527b FW |
137 | __printf(3, 4) __cold |
138 | void nf_ct_l4proto_log_invalid(const struct sk_buff *skb, | |
139 | const struct nf_conn *ct, | |
140 | const char *fmt, ...); | |
c4f3db15 FW |
141 | __printf(5, 6) __cold |
142 | void nf_l4proto_log_invalid(const struct sk_buff *skb, | |
143 | struct net *net, | |
144 | u16 pf, u8 protonum, | |
145 | const char *fmt, ...); | |
9fb9cbb1 | 146 | #else |
c4f3db15 FW |
147 | static inline __printf(5, 6) __cold |
148 | void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net, | |
149 | u16 pf, u8 protonum, const char *fmt, ...) {} | |
3d0b527b FW |
150 | static inline __printf(3, 4) __cold |
151 | void nf_ct_l4proto_log_invalid(const struct sk_buff *skb, | |
152 | const struct nf_conn *ct, | |
153 | const char *fmt, ...) { } | |
9fb9cbb1 YK |
154 | #endif /* CONFIG_SYSCTL */ |
155 | ||
156 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |