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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 | ||
605dcad6 | 18 | struct nf_conntrack_l4proto |
9fb9cbb1 | 19 | { |
9fb9cbb1 YK |
20 | /* L3 Protocol number. */ |
21 | u_int16_t l3proto; | |
22 | ||
605dcad6 MJ |
23 | /* L4 Protocol number. */ |
24 | u_int8_t l4proto; | |
9fb9cbb1 | 25 | |
9fb9cbb1 YK |
26 | /* Try to fill in the third arg: dataoff is offset past network protocol |
27 | hdr. Return true if possible. */ | |
09f263cd JE |
28 | bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, |
29 | struct nf_conntrack_tuple *tuple); | |
9fb9cbb1 YK |
30 | |
31 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. | |
32 | * Some packets can't be inverted: return 0 in that case. | |
33 | */ | |
09f263cd JE |
34 | bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
35 | const struct nf_conntrack_tuple *orig); | |
9fb9cbb1 | 36 | |
9fb9cbb1 | 37 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 38 | int (*packet)(struct nf_conn *ct, |
9fb9cbb1 YK |
39 | const struct sk_buff *skb, |
40 | unsigned int dataoff, | |
41 | enum ip_conntrack_info ctinfo, | |
76108cea | 42 | u_int8_t pf, |
9fb9cbb1 YK |
43 | unsigned int hooknum); |
44 | ||
45 | /* Called when a new connection for this protocol found; | |
46 | * returns TRUE if it's OK. If so, packet() called next. */ | |
09f263cd JE |
47 | bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, |
48 | unsigned int dataoff); | |
9fb9cbb1 YK |
49 | |
50 | /* Called when a conntrack entry is destroyed */ | |
c88130bc | 51 | void (*destroy)(struct nf_conn *ct); |
9fb9cbb1 | 52 | |
74c51a14 | 53 | int (*error)(struct net *net, struct sk_buff *skb, unsigned int dataoff, |
9fb9cbb1 | 54 | 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 | |
c1d10adb | 64 | /* convert protoinfo to nfnetink attributes */ |
fdf70832 | 65 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 66 | struct nf_conn *ct); |
d0dba725 HE |
67 | /* Calculate protoinfo nlattr size */ |
68 | int (*nlattr_size)(void); | |
c1d10adb PNA |
69 | |
70 | /* convert nfnetlink attributes to protoinfo */ | |
fdf70832 | 71 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
c1d10adb | 72 | |
fdf70832 | 73 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
c1d10adb | 74 | const struct nf_conntrack_tuple *t); |
d0dba725 HE |
75 | /* Calculate tuple nlattr size */ |
76 | int (*nlattr_tuple_size)(void); | |
fdf70832 | 77 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
c1d10adb | 78 | struct nf_conntrack_tuple *t); |
f73e924c | 79 | const struct nla_policy *nla_policy; |
c1d10adb | 80 | |
d0dba725 HE |
81 | size_t nla_size; |
82 | ||
d62f9ed4 PM |
83 | #ifdef CONFIG_SYSCTL |
84 | struct ctl_table_header **ctl_table_header; | |
85 | struct ctl_table *ctl_table; | |
86 | unsigned int *ctl_table_users; | |
a999e683 PM |
87 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
88 | struct ctl_table_header *ctl_compat_table_header; | |
89 | struct ctl_table *ctl_compat_table; | |
90 | #endif | |
91 | #endif | |
ffaa9c10 PM |
92 | /* Protocol name */ |
93 | const char *name; | |
d62f9ed4 | 94 | |
9fb9cbb1 YK |
95 | /* Module (if any) which this is connected to. */ |
96 | struct module *me; | |
97 | }; | |
98 | ||
9d2493f8 | 99 | /* Existing built-in generic protocol */ |
605dcad6 | 100 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
9fb9cbb1 YK |
101 | |
102 | #define MAX_NF_CT_PROTO 256 | |
9fb9cbb1 | 103 | |
605dcad6 MJ |
104 | extern struct nf_conntrack_l4proto * |
105 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto); | |
c1d10adb | 106 | |
9fb9cbb1 | 107 | /* Protocol registration. */ |
605dcad6 | 108 | extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto); |
fe3eb20c | 109 | extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto); |
9fb9cbb1 | 110 | |
c1d10adb | 111 | /* Generic netlink helpers */ |
fdf70832 | 112 | extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb | 113 | const struct nf_conntrack_tuple *tuple); |
fdf70832 | 114 | extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb | 115 | struct nf_conntrack_tuple *t); |
5c0de29d | 116 | extern int nf_ct_port_nlattr_tuple_size(void); |
f73e924c | 117 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
c1d10adb | 118 | |
9fb9cbb1 YK |
119 | #ifdef CONFIG_SYSCTL |
120 | #ifdef DEBUG_INVALID_PACKETS | |
c2a2c7e0 AD |
121 | #define LOG_INVALID(net, proto) \ |
122 | ((net)->ct.sysctl_log_invalid == (proto) || \ | |
123 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) | |
9fb9cbb1 | 124 | #else |
c2a2c7e0 AD |
125 | #define LOG_INVALID(net, proto) \ |
126 | (((net)->ct.sysctl_log_invalid == (proto) || \ | |
127 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) \ | |
9fb9cbb1 YK |
128 | && net_ratelimit()) |
129 | #endif | |
130 | #else | |
65f233fb | 131 | static inline int LOG_INVALID(struct net *net, int proto) { return 0; } |
9fb9cbb1 YK |
132 | #endif /* CONFIG_SYSCTL */ |
133 | ||
134 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |