git://bbs.cooldavid.org / net-next-2.6.git / blame
| 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 | |
| 9fb9cbb1 YK |
12 | #include <net/netfilter/nf_conntrack.h> |
| 13 | ||
| 14 | struct seq_file; | |
| c1d10adb | 15 | struct nfattr; |
| 9fb9cbb1 | 16 | |
| 605dcad6 | 17 | struct nf_conntrack_l4proto |
| 9fb9cbb1 | 18 | { |
| 9fb9cbb1 YK |
19 | /* L3 Protocol number. */ |
| 20 | u_int16_t l3proto; | |
| 21 | ||
| 605dcad6 MJ |
22 | /* L4 Protocol number. */ |
| 23 | u_int8_t l4proto; | |
| 9fb9cbb1 YK |
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 | ||
| c1d10adb PNA |
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 | ||
| 9fb9cbb1 YK |
79 | /* Module (if any) which this is connected to. */ |
| 80 | struct module *me; | |
| 81 | }; | |
| 82 | ||
| 83 | /* Existing built-in protocols */ | |
| 605dcad6 MJ |
84 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6; |
| 85 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4; | |
| 86 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6; | |
| 87 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; | |
| 9fb9cbb1 YK |
88 | |
| 89 | #define MAX_NF_CT_PROTO 256 | |
| 605dcad6 | 90 | extern struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX]; |
| 9fb9cbb1 | 91 | |
| 605dcad6 MJ |
92 | extern struct nf_conntrack_l4proto * |
| 93 | __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto); | |
| c1d10adb | 94 | |
| 605dcad6 MJ |
95 | extern struct nf_conntrack_l4proto * |
| 96 | nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol); | |
| c1d10adb | 97 | |
| 605dcad6 | 98 | extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p); |
| 9fb9cbb1 YK |
99 | |
| 100 | /* Protocol registration. */ | |
| 605dcad6 | 101 | extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto); |
| ae5718fb | 102 | extern int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto); |
| 9fb9cbb1 | 103 | |
| c1d10adb PNA |
104 | /* Generic netlink helpers */ |
| 105 | extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb, | |
| 106 | const struct nf_conntrack_tuple *tuple); | |
| 107 | extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[], | |
| 108 | struct nf_conntrack_tuple *t); | |
| 109 | ||
| 9fb9cbb1 YK |
110 | /* Log invalid packets */ |
| 111 | extern unsigned int nf_ct_log_invalid; | |
| 112 | ||
| 113 | #ifdef CONFIG_SYSCTL | |
| 114 | #ifdef DEBUG_INVALID_PACKETS | |
| 115 | #define LOG_INVALID(proto) \ | |
| 116 | (nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) | |
| 117 | #else | |
| 118 | #define LOG_INVALID(proto) \ | |
| 119 | ((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \ | |
| 120 | && net_ratelimit()) | |
| 121 | #endif | |
| 122 | #else | |
| 123 | #define LOG_INVALID(proto) 0 | |
| 124 | #endif /* CONFIG_SYSCTL */ | |
| 125 | ||
| 126 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |