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Commit | Line | Data |
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9fb9cbb1 | 1 | /* |
605dcad6 | 2 | * Header for use in defining a given L4 protocol for connection tracking. |
9fb9cbb1 YK |
3 | * |
4 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
5 | * - generalized L3 protocol dependent part. | |
6 | * | |
7 | * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h | |
8 | */ | |
9 | ||
605dcad6 MJ |
10 | #ifndef _NF_CONNTRACK_L4PROTO_H |
11 | #define _NF_CONNTRACK_L4PROTO_H | |
df6fb868 | 12 | #include <linux/netlink.h> |
f73e924c | 13 | #include <net/netlink.h> |
9fb9cbb1 YK |
14 | #include <net/netfilter/nf_conntrack.h> |
15 | ||
16 | struct seq_file; | |
17 | ||
fd2c3ef7 | 18 | struct nf_conntrack_l4proto { |
9fb9cbb1 YK |
19 | /* L3 Protocol number. */ |
20 | u_int16_t l3proto; | |
21 | ||
605dcad6 MJ |
22 | /* L4 Protocol number. */ |
23 | u_int8_t l4proto; | |
9fb9cbb1 | 24 | |
9fb9cbb1 YK |
25 | /* Try to fill in the third arg: dataoff is offset past network protocol |
26 | hdr. Return true if possible. */ | |
09f263cd JE |
27 | bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, |
28 | struct nf_conntrack_tuple *tuple); | |
9fb9cbb1 YK |
29 | |
30 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. | |
31 | * Some packets can't be inverted: return 0 in that case. | |
32 | */ | |
09f263cd JE |
33 | bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
34 | const struct nf_conntrack_tuple *orig); | |
9fb9cbb1 | 35 | |
9fb9cbb1 | 36 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 37 | int (*packet)(struct nf_conn *ct, |
9fb9cbb1 YK |
38 | const struct sk_buff *skb, |
39 | unsigned int dataoff, | |
40 | enum ip_conntrack_info ctinfo, | |
76108cea | 41 | u_int8_t pf, |
2c8503f5 PNA |
42 | unsigned int hooknum, |
43 | unsigned int *timeouts); | |
9fb9cbb1 YK |
44 | |
45 | /* Called when a new connection for this protocol found; | |
46 | * returns TRUE if it's OK. If so, packet() called next. */ | |
09f263cd | 47 | bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 48 | unsigned int dataoff, unsigned int *timeouts); |
9fb9cbb1 YK |
49 | |
50 | /* Called when a conntrack entry is destroyed */ | |
c88130bc | 51 | void (*destroy)(struct nf_conn *ct); |
9fb9cbb1 | 52 | |
8fea97ec PM |
53 | int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
54 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, | |
76108cea | 55 | u_int8_t pf, unsigned int hooknum); |
9fb9cbb1 | 56 | |
ffaa9c10 PM |
57 | /* Print out the per-protocol part of the tuple. Return like seq_* */ |
58 | int (*print_tuple)(struct seq_file *s, | |
59 | const struct nf_conntrack_tuple *); | |
60 | ||
61 | /* Print out the private part of the conntrack. */ | |
440f0d58 | 62 | int (*print_conntrack)(struct seq_file *s, struct nf_conn *); |
ffaa9c10 | 63 | |
2c8503f5 PNA |
64 | /* Return the array of timeouts for this protocol. */ |
65 | unsigned int *(*get_timeouts)(struct net *net); | |
66 | ||
c1d10adb | 67 | /* convert protoinfo to nfnetink attributes */ |
fdf70832 | 68 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 69 | struct nf_conn *ct); |
d0dba725 HE |
70 | /* Calculate protoinfo nlattr size */ |
71 | int (*nlattr_size)(void); | |
c1d10adb PNA |
72 | |
73 | /* convert nfnetlink attributes to protoinfo */ | |
fdf70832 | 74 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
c1d10adb | 75 | |
fdf70832 | 76 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
c1d10adb | 77 | const struct nf_conntrack_tuple *t); |
d0dba725 HE |
78 | /* Calculate tuple nlattr size */ |
79 | int (*nlattr_tuple_size)(void); | |
fdf70832 | 80 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
c1d10adb | 81 | struct nf_conntrack_tuple *t); |
f73e924c | 82 | const struct nla_policy *nla_policy; |
c1d10adb | 83 | |
d0dba725 HE |
84 | size_t nla_size; |
85 | ||
50978462 PNA |
86 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
87 | struct { | |
88 | size_t obj_size; | |
89 | int (*nlattr_to_obj)(struct nlattr *tb[], void *data); | |
90 | int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); | |
91 | ||
92 | unsigned int nlattr_max; | |
93 | const struct nla_policy *nla_policy; | |
94 | } ctnl_timeout; | |
95 | #endif | |
96 | ||
d62f9ed4 PM |
97 | #ifdef CONFIG_SYSCTL |
98 | struct ctl_table_header **ctl_table_header; | |
99 | struct ctl_table *ctl_table; | |
100 | unsigned int *ctl_table_users; | |
a999e683 PM |
101 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
102 | struct ctl_table_header *ctl_compat_table_header; | |
103 | struct ctl_table *ctl_compat_table; | |
104 | #endif | |
105 | #endif | |
ffaa9c10 PM |
106 | /* Protocol name */ |
107 | const char *name; | |
d62f9ed4 | 108 | |
9fb9cbb1 YK |
109 | /* Module (if any) which this is connected to. */ |
110 | struct module *me; | |
111 | }; | |
112 | ||
9d2493f8 | 113 | /* Existing built-in generic protocol */ |
605dcad6 | 114 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
9fb9cbb1 YK |
115 | |
116 | #define MAX_NF_CT_PROTO 256 | |
9fb9cbb1 | 117 | |
605dcad6 MJ |
118 | extern struct nf_conntrack_l4proto * |
119 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto); | |
c1d10adb | 120 | |
9fb9cbb1 | 121 | /* Protocol registration. */ |
605dcad6 | 122 | extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto); |
fe3eb20c | 123 | extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto); |
9fb9cbb1 | 124 | |
c1d10adb | 125 | /* Generic netlink helpers */ |
fdf70832 | 126 | extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb | 127 | const struct nf_conntrack_tuple *tuple); |
fdf70832 | 128 | extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb | 129 | struct nf_conntrack_tuple *t); |
5c0de29d | 130 | extern int nf_ct_port_nlattr_tuple_size(void); |
f73e924c | 131 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
c1d10adb | 132 | |
9fb9cbb1 YK |
133 | #ifdef CONFIG_SYSCTL |
134 | #ifdef DEBUG_INVALID_PACKETS | |
c2a2c7e0 AD |
135 | #define LOG_INVALID(net, proto) \ |
136 | ((net)->ct.sysctl_log_invalid == (proto) || \ | |
137 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) | |
9fb9cbb1 | 138 | #else |
c2a2c7e0 AD |
139 | #define LOG_INVALID(net, proto) \ |
140 | (((net)->ct.sysctl_log_invalid == (proto) || \ | |
141 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) \ | |
9fb9cbb1 YK |
142 | && net_ratelimit()) |
143 | #endif | |
144 | #else | |
65f233fb | 145 | static inline int LOG_INVALID(struct net *net, int proto) { return 0; } |
9fb9cbb1 YK |
146 | #endif /* CONFIG_SYSCTL */ |
147 | ||
148 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |