Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 2 | * Header for use in defining a given L4 protocol for connection tracking. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 10 | #ifndef _NF_CONNTRACK_L4PROTO_H |
| 11 | #define _NF_CONNTRACK_L4PROTO_H |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 12 | #include <net/netfilter/nf_conntrack.h> |
| 13 | |
| 14 | struct seq_file; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 15 | struct nfattr; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 16 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 17 | struct nf_conntrack_l4proto |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 18 | { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 19 | /* L3 Protocol number. */ |
| 20 | u_int16_t l3proto; |
| 21 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 22 | /* L4 Protocol number. */ |
| 23 | u_int8_t l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 24 | |
| 25 | /* Protocol name */ |
| 26 | const char *name; |
| 27 | |
| 28 | /* Try to fill in the third arg: dataoff is offset past network protocol |
| 29 | hdr. Return true if possible. */ |
| 30 | int (*pkt_to_tuple)(const struct sk_buff *skb, |
| 31 | unsigned int dataoff, |
| 32 | struct nf_conntrack_tuple *tuple); |
| 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 | */ |
| 37 | int (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
| 38 | const struct nf_conntrack_tuple *orig); |
| 39 | |
| 40 | /* Print out the per-protocol part of the tuple. Return like seq_* */ |
| 41 | int (*print_tuple)(struct seq_file *s, |
| 42 | const struct nf_conntrack_tuple *); |
| 43 | |
| 44 | /* Print out the private part of the conntrack. */ |
| 45 | int (*print_conntrack)(struct seq_file *s, const struct nf_conn *); |
| 46 | |
| 47 | /* Returns verdict for packet, or -1 for invalid. */ |
| 48 | int (*packet)(struct nf_conn *conntrack, |
| 49 | const struct sk_buff *skb, |
| 50 | unsigned int dataoff, |
| 51 | enum ip_conntrack_info ctinfo, |
| 52 | int pf, |
| 53 | unsigned int hooknum); |
| 54 | |
| 55 | /* Called when a new connection for this protocol found; |
| 56 | * returns TRUE if it's OK. If so, packet() called next. */ |
| 57 | int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb, |
| 58 | unsigned int dataoff); |
| 59 | |
| 60 | /* Called when a conntrack entry is destroyed */ |
| 61 | void (*destroy)(struct nf_conn *conntrack); |
| 62 | |
| 63 | int (*error)(struct sk_buff *skb, unsigned int dataoff, |
| 64 | enum ip_conntrack_info *ctinfo, |
| 65 | int pf, unsigned int hooknum); |
| 66 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 67 | /* convert protoinfo to nfnetink attributes */ |
| 68 | int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa, |
| 69 | const struct nf_conn *ct); |
| 70 | |
| 71 | /* convert nfnetlink attributes to protoinfo */ |
| 72 | int (*from_nfattr)(struct nfattr *tb[], struct nf_conn *ct); |
| 73 | |
| 74 | int (*tuple_to_nfattr)(struct sk_buff *skb, |
| 75 | const struct nf_conntrack_tuple *t); |
| 76 | int (*nfattr_to_tuple)(struct nfattr *tb[], |
| 77 | struct nf_conntrack_tuple *t); |
| 78 | |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 79 | #ifdef CONFIG_SYSCTL |
| 80 | struct ctl_table_header **ctl_table_header; |
| 81 | struct ctl_table *ctl_table; |
| 82 | unsigned int *ctl_table_users; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 83 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 84 | struct ctl_table_header *ctl_compat_table_header; |
| 85 | struct ctl_table *ctl_compat_table; |
| 86 | #endif |
| 87 | #endif |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 88 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 89 | /* Module (if any) which this is connected to. */ |
| 90 | struct module *me; |
| 91 | }; |
| 92 | |
| 93 | /* Existing built-in protocols */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 94 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6; |
| 95 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4; |
| 96 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6; |
| 97 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 98 | |
| 99 | #define MAX_NF_CT_PROTO 256 |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 100 | extern struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 101 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 102 | extern struct nf_conntrack_l4proto * |
| 103 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 104 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 105 | extern struct nf_conntrack_l4proto * |
| 106 | nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 107 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 108 | extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 109 | |
| 110 | /* Protocol registration. */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 111 | extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto); |
Martin Josefsson | ae5718f | 2006-11-29 02:35:08 +0100 | [diff] [blame] | 112 | extern int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 113 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 114 | /* Generic netlink helpers */ |
| 115 | extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb, |
| 116 | const struct nf_conntrack_tuple *tuple); |
| 117 | extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[], |
| 118 | struct nf_conntrack_tuple *t); |
| 119 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 120 | /* Log invalid packets */ |
| 121 | extern unsigned int nf_ct_log_invalid; |
| 122 | |
| 123 | #ifdef CONFIG_SYSCTL |
| 124 | #ifdef DEBUG_INVALID_PACKETS |
| 125 | #define LOG_INVALID(proto) \ |
| 126 | (nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) |
| 127 | #else |
| 128 | #define LOG_INVALID(proto) \ |
| 129 | ((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \ |
| 130 | && net_ratelimit()) |
| 131 | #endif |
| 132 | #else |
| 133 | #define LOG_INVALID(proto) 0 |
| 134 | #endif /* CONFIG_SYSCTL */ |
| 135 | |
| 136 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |