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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 | 14 | #include <net/netfilter/nf_conntrack.h> |
2c352f44 | 15 | #include <net/netns/generic.h> |
9fb9cbb1 YK |
16 | |
17 | struct seq_file; | |
18 | ||
fd2c3ef7 | 19 | struct nf_conntrack_l4proto { |
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, |
2c8503f5 PNA |
43 | unsigned int hooknum, |
44 | unsigned int *timeouts); | |
9fb9cbb1 YK |
45 | |
46 | /* Called when a new connection for this protocol found; | |
47 | * returns TRUE if it's OK. If so, packet() called next. */ | |
09f263cd | 48 | bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 49 | unsigned int dataoff, unsigned int *timeouts); |
9fb9cbb1 YK |
50 | |
51 | /* Called when a conntrack entry is destroyed */ | |
c88130bc | 52 | void (*destroy)(struct nf_conn *ct); |
9fb9cbb1 | 53 | |
8fea97ec PM |
54 | int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
55 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, | |
76108cea | 56 | u_int8_t pf, unsigned int hooknum); |
9fb9cbb1 | 57 | |
ffaa9c10 PM |
58 | /* Print out the per-protocol part of the tuple. Return like seq_* */ |
59 | int (*print_tuple)(struct seq_file *s, | |
60 | const struct nf_conntrack_tuple *); | |
61 | ||
62 | /* Print out the private part of the conntrack. */ | |
440f0d58 | 63 | int (*print_conntrack)(struct seq_file *s, struct nf_conn *); |
ffaa9c10 | 64 | |
2c8503f5 PNA |
65 | /* Return the array of timeouts for this protocol. */ |
66 | unsigned int *(*get_timeouts)(struct net *net); | |
67 | ||
c1d10adb | 68 | /* convert protoinfo to nfnetink attributes */ |
fdf70832 | 69 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 70 | struct nf_conn *ct); |
d0dba725 HE |
71 | /* Calculate protoinfo nlattr size */ |
72 | int (*nlattr_size)(void); | |
c1d10adb PNA |
73 | |
74 | /* convert nfnetlink attributes to protoinfo */ | |
fdf70832 | 75 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
c1d10adb | 76 | |
fdf70832 | 77 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
c1d10adb | 78 | const struct nf_conntrack_tuple *t); |
d0dba725 HE |
79 | /* Calculate tuple nlattr size */ |
80 | int (*nlattr_tuple_size)(void); | |
fdf70832 | 81 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
c1d10adb | 82 | struct nf_conntrack_tuple *t); |
f73e924c | 83 | const struct nla_policy *nla_policy; |
c1d10adb | 84 | |
d0dba725 HE |
85 | size_t nla_size; |
86 | ||
50978462 PNA |
87 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
88 | struct { | |
89 | size_t obj_size; | |
8264deb8 G |
90 | int (*nlattr_to_obj)(struct nlattr *tb[], |
91 | struct net *net, void *data); | |
50978462 PNA |
92 | int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); |
93 | ||
94 | unsigned int nlattr_max; | |
95 | const struct nla_policy *nla_policy; | |
96 | } ctnl_timeout; | |
a999e683 | 97 | #endif |
2c352f44 G |
98 | int *net_id; |
99 | /* Init l4proto pernet data */ | |
f1caad27 | 100 | int (*init_net)(struct net *net, u_int16_t proto); |
2c352f44 | 101 | |
ffaa9c10 PM |
102 | /* Protocol name */ |
103 | const char *name; | |
d62f9ed4 | 104 | |
9fb9cbb1 YK |
105 | /* Module (if any) which this is connected to. */ |
106 | struct module *me; | |
107 | }; | |
108 | ||
9d2493f8 | 109 | /* Existing built-in generic protocol */ |
605dcad6 | 110 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
9fb9cbb1 YK |
111 | |
112 | #define MAX_NF_CT_PROTO 256 | |
9fb9cbb1 | 113 | |
605dcad6 MJ |
114 | extern struct nf_conntrack_l4proto * |
115 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto); | |
c1d10adb | 116 | |
c1ebd7df PNA |
117 | extern struct nf_conntrack_l4proto * |
118 | nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t l4proto); | |
119 | extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p); | |
120 | ||
9fb9cbb1 | 121 | /* Protocol registration. */ |
2c352f44 G |
122 | extern int nf_conntrack_l4proto_register(struct net *net, |
123 | struct nf_conntrack_l4proto *proto); | |
124 | extern void nf_conntrack_l4proto_unregister(struct net *net, | |
125 | struct nf_conntrack_l4proto *proto); | |
9fb9cbb1 | 126 | |
f28997e2 G |
127 | static inline void nf_ct_kfree_compat_sysctl_table(struct nf_proto_net *pn) |
128 | { | |
129 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
130 | kfree(pn->ctl_compat_table); | |
131 | pn->ctl_compat_table = NULL; | |
132 | #endif | |
133 | } | |
134 | ||
c1d10adb | 135 | /* Generic netlink helpers */ |
fdf70832 | 136 | extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb | 137 | const struct nf_conntrack_tuple *tuple); |
fdf70832 | 138 | extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb | 139 | struct nf_conntrack_tuple *t); |
5c0de29d | 140 | extern int nf_ct_port_nlattr_tuple_size(void); |
f73e924c | 141 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
c1d10adb | 142 | |
9fb9cbb1 YK |
143 | #ifdef CONFIG_SYSCTL |
144 | #ifdef DEBUG_INVALID_PACKETS | |
c2a2c7e0 AD |
145 | #define LOG_INVALID(net, proto) \ |
146 | ((net)->ct.sysctl_log_invalid == (proto) || \ | |
147 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) | |
9fb9cbb1 | 148 | #else |
c2a2c7e0 AD |
149 | #define LOG_INVALID(net, proto) \ |
150 | (((net)->ct.sysctl_log_invalid == (proto) || \ | |
151 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) \ | |
9fb9cbb1 YK |
152 | && net_ratelimit()) |
153 | #endif | |
154 | #else | |
65f233fb | 155 | static inline int LOG_INVALID(struct net *net, int proto) { return 0; } |
9fb9cbb1 YK |
156 | #endif /* CONFIG_SYSCTL */ |
157 | ||
158 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |