Commit | Line | Data |
---|---|---|
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 | |
71d8c47f PNA |
26 | /* Resolve clashes on insertion races. */ |
27 | bool allow_clash; | |
28 | ||
9fb9cbb1 YK |
29 | /* Try to fill in the third arg: dataoff is offset past network protocol |
30 | hdr. Return true if possible. */ | |
09f263cd | 31 | bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, |
a31f1adc | 32 | struct net *net, struct nf_conntrack_tuple *tuple); |
9fb9cbb1 YK |
33 | |
34 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. | |
35 | * Some packets can't be inverted: return 0 in that case. | |
36 | */ | |
09f263cd JE |
37 | bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
38 | const struct nf_conntrack_tuple *orig); | |
9fb9cbb1 | 39 | |
9fb9cbb1 | 40 | /* Returns verdict for packet, or -1 for invalid. */ |
c88130bc | 41 | int (*packet)(struct nf_conn *ct, |
9fb9cbb1 YK |
42 | const struct sk_buff *skb, |
43 | unsigned int dataoff, | |
44 | enum ip_conntrack_info ctinfo, | |
76108cea | 45 | u_int8_t pf, |
2c8503f5 PNA |
46 | unsigned int hooknum, |
47 | unsigned int *timeouts); | |
9fb9cbb1 YK |
48 | |
49 | /* Called when a new connection for this protocol found; | |
50 | * returns TRUE if it's OK. If so, packet() called next. */ | |
09f263cd | 51 | bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 52 | unsigned int dataoff, unsigned int *timeouts); |
9fb9cbb1 YK |
53 | |
54 | /* Called when a conntrack entry is destroyed */ | |
c88130bc | 55 | void (*destroy)(struct nf_conn *ct); |
9fb9cbb1 | 56 | |
8fea97ec PM |
57 | int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
58 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, | |
76108cea | 59 | u_int8_t pf, unsigned int hooknum); |
9fb9cbb1 | 60 | |
ffaa9c10 | 61 | /* Print out the per-protocol part of the tuple. Return like seq_* */ |
824f1fbe JP |
62 | void (*print_tuple)(struct seq_file *s, |
63 | const struct nf_conntrack_tuple *); | |
ffaa9c10 PM |
64 | |
65 | /* Print out the private part of the conntrack. */ | |
37246a58 | 66 | void (*print_conntrack)(struct seq_file *s, struct nf_conn *); |
ffaa9c10 | 67 | |
2c8503f5 PNA |
68 | /* Return the array of timeouts for this protocol. */ |
69 | unsigned int *(*get_timeouts)(struct net *net); | |
70 | ||
c1d10adb | 71 | /* convert protoinfo to nfnetink attributes */ |
fdf70832 | 72 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
440f0d58 | 73 | struct nf_conn *ct); |
d0dba725 HE |
74 | /* Calculate protoinfo nlattr size */ |
75 | int (*nlattr_size)(void); | |
c1d10adb PNA |
76 | |
77 | /* convert nfnetlink attributes to protoinfo */ | |
fdf70832 | 78 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
c1d10adb | 79 | |
fdf70832 | 80 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
c1d10adb | 81 | const struct nf_conntrack_tuple *t); |
d0dba725 HE |
82 | /* Calculate tuple nlattr size */ |
83 | int (*nlattr_tuple_size)(void); | |
fdf70832 | 84 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
c1d10adb | 85 | struct nf_conntrack_tuple *t); |
f73e924c | 86 | const struct nla_policy *nla_policy; |
c1d10adb | 87 | |
d0dba725 HE |
88 | size_t nla_size; |
89 | ||
50978462 PNA |
90 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
91 | struct { | |
92 | size_t obj_size; | |
8264deb8 G |
93 | int (*nlattr_to_obj)(struct nlattr *tb[], |
94 | struct net *net, void *data); | |
50978462 PNA |
95 | int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); |
96 | ||
97 | unsigned int nlattr_max; | |
98 | const struct nla_policy *nla_policy; | |
99 | } ctnl_timeout; | |
a999e683 | 100 | #endif |
2c352f44 G |
101 | int *net_id; |
102 | /* Init l4proto pernet data */ | |
f1caad27 | 103 | int (*init_net)(struct net *net, u_int16_t proto); |
2c352f44 | 104 | |
08911475 PNA |
105 | /* Return the per-net protocol part. */ |
106 | struct nf_proto_net *(*get_net_proto)(struct net *net); | |
107 | ||
ffaa9c10 PM |
108 | /* Protocol name */ |
109 | const char *name; | |
d62f9ed4 | 110 | |
9fb9cbb1 YK |
111 | /* Module (if any) which this is connected to. */ |
112 | struct module *me; | |
113 | }; | |
114 | ||
9d2493f8 | 115 | /* Existing built-in generic protocol */ |
605dcad6 | 116 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
9fb9cbb1 YK |
117 | |
118 | #define MAX_NF_CT_PROTO 256 | |
9fb9cbb1 | 119 | |
4e77be46 JP |
120 | struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto, |
121 | u_int8_t l4proto); | |
c1d10adb | 122 | |
4e77be46 JP |
123 | struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto, |
124 | u_int8_t l4proto); | |
125 | void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p); | |
c1ebd7df | 126 | |
c296bb4d | 127 | /* Protocol pernet registration. */ |
4e77be46 JP |
128 | int nf_ct_l4proto_pernet_register(struct net *net, |
129 | struct nf_conntrack_l4proto *proto); | |
130 | void nf_ct_l4proto_pernet_unregister(struct net *net, | |
131 | struct nf_conntrack_l4proto *proto); | |
9fb9cbb1 | 132 | |
c296bb4d | 133 | /* Protocol global registration. */ |
4e77be46 JP |
134 | int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto); |
135 | void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto); | |
c296bb4d | 136 | |
f28997e2 G |
137 | static inline void nf_ct_kfree_compat_sysctl_table(struct nf_proto_net *pn) |
138 | { | |
139 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) | |
140 | kfree(pn->ctl_compat_table); | |
141 | pn->ctl_compat_table = NULL; | |
142 | #endif | |
143 | } | |
144 | ||
c1d10adb | 145 | /* Generic netlink helpers */ |
4e77be46 JP |
146 | int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
147 | const struct nf_conntrack_tuple *tuple); | |
148 | int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], | |
149 | struct nf_conntrack_tuple *t); | |
150 | int nf_ct_port_nlattr_tuple_size(void); | |
f73e924c | 151 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
c1d10adb | 152 | |
9fb9cbb1 | 153 | #ifdef CONFIG_SYSCTL |
c2a2c7e0 AD |
154 | #define LOG_INVALID(net, proto) \ |
155 | ((net)->ct.sysctl_log_invalid == (proto) || \ | |
156 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) | |
9fb9cbb1 | 157 | #else |
65f233fb | 158 | static inline int LOG_INVALID(struct net *net, int proto) { return 0; } |
9fb9cbb1 YK |
159 | #endif /* CONFIG_SYSCTL */ |
160 | ||
161 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |