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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 | ||
9fb9cbb1 YK |
30 | /* Try to fill in the third arg: dataoff is offset past network protocol |
31 | hdr. Return true if possible. */ | |
09f263cd | 32 | bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, |
a31f1adc | 33 | struct net *net, struct nf_conntrack_tuple *tuple); |
9fb9cbb1 YK |
34 | |
35 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. | |
36 | * Some packets can't be inverted: return 0 in that case. | |
37 | */ | |
09f263cd JE |
38 | bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
39 | const struct nf_conntrack_tuple *orig); | |
9fb9cbb1 | 40 | |
9fb9cbb1 | 41 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 42 | int (*packet)(struct nf_conn *ct, |
9fb9cbb1 YK |
43 | const struct sk_buff *skb, |
44 | unsigned int dataoff, | |
45 | enum ip_conntrack_info ctinfo, | |
2c8503f5 | 46 | unsigned int *timeouts); |
9fb9cbb1 YK |
47 | |
48 | /* Called when a new connection for this protocol found; | |
49 | * returns TRUE if it's OK. If so, packet() called next. */ | |
09f263cd | 50 | bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 51 | unsigned int dataoff, unsigned int *timeouts); |
9fb9cbb1 YK |
52 | |
53 | /* Called when a conntrack entry is destroyed */ | |
c88130bc | 54 | void (*destroy)(struct nf_conn *ct); |
9fb9cbb1 | 55 | |
8fea97ec | 56 | int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
11df4b76 | 57 | unsigned int dataoff, |
76108cea | 58 | u_int8_t pf, unsigned int hooknum); |
9fb9cbb1 | 59 | |
c6dd940b FW |
60 | /* called by gc worker if table is full */ |
61 | bool (*can_early_drop)(const struct nf_conn *ct); | |
62 | ||
2c8503f5 PNA |
63 | /* Return the array of timeouts for this protocol. */ |
64 | unsigned int *(*get_timeouts)(struct net *net); | |
65 | ||
c1d10adb | 66 | /* convert protoinfo to nfnetink attributes */ |
fdf70832 | 67 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 68 | struct nf_conn *ct); |
d0dba725 HE |
69 | /* Calculate protoinfo nlattr size */ |
70 | int (*nlattr_size)(void); | |
c1d10adb PNA |
71 | |
72 | /* convert nfnetlink attributes to protoinfo */ | |
fdf70832 | 73 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
c1d10adb | 74 | |
fdf70832 | 75 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
c1d10adb | 76 | const struct nf_conntrack_tuple *t); |
d0dba725 | 77 | /* Calculate tuple nlattr size */ |
5caaed15 | 78 | unsigned int (*nlattr_tuple_size)(void); |
fdf70832 | 79 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
c1d10adb | 80 | struct nf_conntrack_tuple *t); |
f73e924c | 81 | const struct nla_policy *nla_policy; |
c1d10adb | 82 | |
d0dba725 HE |
83 | size_t nla_size; |
84 | ||
50978462 PNA |
85 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
86 | struct { | |
8264deb8 G |
87 | int (*nlattr_to_obj)(struct nlattr *tb[], |
88 | struct net *net, void *data); | |
50978462 PNA |
89 | int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); |
90 | ||
036c6940 FW |
91 | u16 obj_size; |
92 | u16 nlattr_max; | |
50978462 PNA |
93 | const struct nla_policy *nla_policy; |
94 | } ctnl_timeout; | |
ea48cc83 FW |
95 | #endif |
96 | #ifdef CONFIG_NF_CONNTRACK_PROCFS | |
97 | /* Print out the private part of the conntrack. */ | |
98 | void (*print_conntrack)(struct seq_file *s, struct nf_conn *); | |
a999e683 | 99 | #endif |
c7d03a00 | 100 | unsigned int *net_id; |
2c352f44 | 101 | /* Init l4proto pernet data */ |
f1caad27 | 102 | int (*init_net)(struct net *net, u_int16_t proto); |
2c352f44 | 103 | |
08911475 PNA |
104 | /* Return the per-net protocol part. */ |
105 | struct nf_proto_net *(*get_net_proto)(struct net *net); | |
106 | ||
9fb9cbb1 YK |
107 | /* Module (if any) which this is connected to. */ |
108 | struct module *me; | |
109 | }; | |
110 | ||
9d2493f8 | 111 | /* Existing built-in generic protocol */ |
605dcad6 | 112 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
9fb9cbb1 YK |
113 | |
114 | #define MAX_NF_CT_PROTO 256 | |
9fb9cbb1 | 115 | |
b3480fe0 | 116 | const struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto, |
4e77be46 | 117 | u_int8_t l4proto); |
c1d10adb | 118 | |
b3480fe0 | 119 | const struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto, |
4e77be46 | 120 | u_int8_t l4proto); |
2a04aabf | 121 | void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p); |
c1ebd7df | 122 | |
c296bb4d | 123 | /* Protocol pernet registration. */ |
0e54d217 | 124 | int nf_ct_l4proto_pernet_register_one(struct net *net, |
2a04aabf | 125 | const struct nf_conntrack_l4proto *proto); |
0e54d217 | 126 | void nf_ct_l4proto_pernet_unregister_one(struct net *net, |
2a04aabf | 127 | const struct nf_conntrack_l4proto *proto); |
4e77be46 | 128 | int nf_ct_l4proto_pernet_register(struct net *net, |
2a04aabf | 129 | struct nf_conntrack_l4proto *const proto[], |
0e54d217 | 130 | unsigned int num_proto); |
4e77be46 | 131 | void nf_ct_l4proto_pernet_unregister(struct net *net, |
2a04aabf JL |
132 | struct nf_conntrack_l4proto *const proto[], |
133 | unsigned int num_proto); | |
9fb9cbb1 | 134 | |
c296bb4d | 135 | /* Protocol global registration. */ |
0e54d217 | 136 | int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *proto); |
2a04aabf | 137 | void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *proto); |
0e54d217 DC |
138 | int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto[], |
139 | unsigned int num_proto); | |
140 | void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto[], | |
141 | unsigned int num_proto); | |
c296bb4d | 142 | |
c1d10adb | 143 | /* Generic netlink helpers */ |
4e77be46 JP |
144 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
145 | const struct nf_conntrack_tuple *tuple); | |
146 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], | |
147 | struct nf_conntrack_tuple *t); | |
5caaed15 | 148 | unsigned int nf_ct_port_nlattr_tuple_size(void); |
f73e924c | 149 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
c1d10adb | 150 | |
9fb9cbb1 | 151 | #ifdef CONFIG_SYSCTL |
3d0b527b FW |
152 | __printf(3, 4) __cold |
153 | void nf_ct_l4proto_log_invalid(const struct sk_buff *skb, | |
154 | const struct nf_conn *ct, | |
155 | const char *fmt, ...); | |
c4f3db15 FW |
156 | __printf(5, 6) __cold |
157 | void nf_l4proto_log_invalid(const struct sk_buff *skb, | |
158 | struct net *net, | |
159 | u16 pf, u8 protonum, | |
160 | const char *fmt, ...); | |
9fb9cbb1 | 161 | #else |
c4f3db15 FW |
162 | static inline __printf(5, 6) __cold |
163 | void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net, | |
164 | u16 pf, u8 protonum, const char *fmt, ...) {} | |
3d0b527b FW |
165 | static inline __printf(3, 4) __cold |
166 | void nf_ct_l4proto_log_invalid(const struct sk_buff *skb, | |
167 | const struct nf_conn *ct, | |
168 | const char *fmt, ...) { } | |
9fb9cbb1 YK |
169 | #endif /* CONFIG_SYSCTL */ |
170 | ||
171 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |