projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9fb9cbb1 YK |
1 | /* |
| 2 | * Header for use in defining a given protocol for connection tracking. | |
| 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 | ||
| 10 | #ifndef _NF_CONNTRACK_PROTOCOL_H | |
| 11 | #define _NF_CONNTRACK_PROTOCOL_H | |
| 12 | #include <net/netfilter/nf_conntrack.h> | |
| 13 | ||
| 14 | struct seq_file; | |
| c1d10adb | 15 | struct nfattr; |
| 9fb9cbb1 YK |
16 | |
| 17 | struct nf_conntrack_protocol | |
| 18 | { | |
| 19 | /* Next pointer. */ | |
| 20 | struct list_head list; | |
| 21 | ||
| 22 | /* L3 Protocol number. */ | |
| 23 | u_int16_t l3proto; | |
| 24 | ||
| 25 | /* Protocol number. */ | |
| 26 | u_int8_t proto; | |
| 27 | ||
| 28 | /* Protocol name */ | |
| 29 | const char *name; | |
| 30 | ||
| 31 | /* Try to fill in the third arg: dataoff is offset past network protocol | |
| 32 | hdr. Return true if possible. */ | |
| 33 | int (*pkt_to_tuple)(const struct sk_buff *skb, | |
| 34 | unsigned int dataoff, | |
| 35 | struct nf_conntrack_tuple *tuple); | |
| 36 | ||
| 37 | /* Invert the per-proto part of the tuple: ie. turn xmit into reply. | |
| 38 | * Some packets can't be inverted: return 0 in that case. | |
| 39 | */ | |
| 40 | int (*invert_tuple)(struct nf_conntrack_tuple *inverse, | |
| 41 | const struct nf_conntrack_tuple *orig); | |
| 42 | ||
| 43 | /* Print out the per-protocol part of the tuple. Return like seq_* */ | |
| 44 | int (*print_tuple)(struct seq_file *s, | |
| 45 | const struct nf_conntrack_tuple *); | |
| 46 | ||
| 47 | /* Print out the private part of the conntrack. */ | |
| 48 | int (*print_conntrack)(struct seq_file *s, const struct nf_conn *); | |
| 49 | ||
| 50 | /* Returns verdict for packet, or -1 for invalid. */ | |
| 51 | int (*packet)(struct nf_conn *conntrack, | |
| 52 | const struct sk_buff *skb, | |
| 53 | unsigned int dataoff, | |
| 54 | enum ip_conntrack_info ctinfo, | |
| 55 | int pf, | |
| 56 | unsigned int hooknum); | |
| 57 | ||
| 58 | /* Called when a new connection for this protocol found; | |
| 59 | * returns TRUE if it's OK. If so, packet() called next. */ | |
| 60 | int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb, | |
| 61 | unsigned int dataoff); | |
| 62 | ||
| 63 | /* Called when a conntrack entry is destroyed */ | |
| 64 | void (*destroy)(struct nf_conn *conntrack); | |
| 65 | ||
| 66 | int (*error)(struct sk_buff *skb, unsigned int dataoff, | |
| 67 | enum ip_conntrack_info *ctinfo, | |
| 68 | int pf, unsigned int hooknum); | |
| 69 | ||
| c1d10adb PNA |
70 | /* convert protoinfo to nfnetink attributes */ |
| 71 | int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa, | |
| 72 | const struct nf_conn *ct); | |
| 73 | ||
| 74 | /* convert nfnetlink attributes to protoinfo */ | |
| 75 | int (*from_nfattr)(struct nfattr *tb[], struct nf_conn *ct); | |
| 76 | ||
| 77 | int (*tuple_to_nfattr)(struct sk_buff *skb, | |
| 78 | const struct nf_conntrack_tuple *t); | |
| 79 | int (*nfattr_to_tuple)(struct nfattr *tb[], | |
| 80 | struct nf_conntrack_tuple *t); | |
| 81 | ||
| 9fb9cbb1 YK |
82 | /* Module (if any) which this is connected to. */ |
| 83 | struct module *me; | |
| 84 | }; | |
| 85 | ||
| 86 | /* Existing built-in protocols */ | |
| 87 | extern struct nf_conntrack_protocol nf_conntrack_protocol_tcp6; | |
| 88 | extern struct nf_conntrack_protocol nf_conntrack_protocol_udp4; | |
| 89 | extern struct nf_conntrack_protocol nf_conntrack_protocol_udp6; | |
| 90 | extern struct nf_conntrack_protocol nf_conntrack_generic_protocol; | |
| 91 | ||
| 92 | #define MAX_NF_CT_PROTO 256 | |
| 93 | extern struct nf_conntrack_protocol **nf_ct_protos[PF_MAX]; | |
| 94 | ||
| 95 | extern struct nf_conntrack_protocol * | |
| c1d10adb PNA |
96 | __nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol); |
| 97 | ||
| 98 | extern struct nf_conntrack_protocol * | |
| 99 | nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol); | |
| 100 | ||
| 101 | extern void nf_ct_proto_put(struct nf_conntrack_protocol *p); | |
| 9fb9cbb1 YK |
102 | |
| 103 | /* Protocol registration. */ | |
| 104 | extern int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto); | |
| 105 | extern void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto); | |
| 106 | ||
| c1d10adb PNA |
107 | /* Generic netlink helpers */ |
| 108 | extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb, | |
| 109 | const struct nf_conntrack_tuple *tuple); | |
| 110 | extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[], | |
| 111 | struct nf_conntrack_tuple *t); | |
| 112 | ||
| 9fb9cbb1 YK |
113 | /* Log invalid packets */ |
| 114 | extern unsigned int nf_ct_log_invalid; | |
| 115 | ||
| 116 | #ifdef CONFIG_SYSCTL | |
| 117 | #ifdef DEBUG_INVALID_PACKETS | |
| 118 | #define LOG_INVALID(proto) \ | |
| 119 | (nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) | |
| 120 | #else | |
| 121 | #define LOG_INVALID(proto) \ | |
| 122 | ((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \ | |
| 123 | && net_ratelimit()) | |
| 124 | #endif | |
| 125 | #else | |
| 126 | #define LOG_INVALID(proto) 0 | |
| 127 | #endif /* CONFIG_SYSCTL */ | |
| 128 | ||
| 129 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |