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 |
Patrick McHardy | df6fb86 | 2007-09-28 14:37:03 -0700 | [diff] [blame] | 12 | #include <linux/netlink.h> |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 13 | #include <net/netlink.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 14 | #include <net/netfilter/nf_conntrack.h> |
Gao feng | 2c352f4 | 2012-05-28 21:04:09 +0000 | [diff] [blame] | 15 | #include <net/netns/generic.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 16 | |
| 17 | struct seq_file; |
| 18 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 19 | struct nf_conntrack_l4proto { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 20 | /* L3 Protocol number. */ |
| 21 | u_int16_t l3proto; |
| 22 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 23 | /* L4 Protocol number. */ |
| 24 | u_int8_t l4proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 25 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 26 | /* Try to fill in the third arg: dataoff is offset past network protocol |
| 27 | hdr. Return true if possible. */ |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 28 | bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, |
| 29 | struct nf_conntrack_tuple *tuple); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 | */ |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 34 | bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, |
| 35 | const struct nf_conntrack_tuple *orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 36 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 37 | /* Returns verdict for packet, or -1 for invalid. */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 38 | int (*packet)(struct nf_conn *ct, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 39 | const struct sk_buff *skb, |
| 40 | unsigned int dataoff, |
| 41 | enum ip_conntrack_info ctinfo, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 42 | u_int8_t pf, |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 43 | unsigned int hooknum, |
| 44 | unsigned int *timeouts); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 45 | |
| 46 | /* Called when a new connection for this protocol found; |
| 47 | * returns TRUE if it's OK. If so, packet() called next. */ |
Jan Engelhardt | 09f263c | 2008-04-14 11:15:53 +0200 | [diff] [blame] | 48 | bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 49 | unsigned int dataoff, unsigned int *timeouts); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 50 | |
| 51 | /* Called when a conntrack entry is destroyed */ |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 52 | void (*destroy)(struct nf_conn *ct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 53 | |
Patrick McHardy | 8fea97e | 2010-02-15 17:45:08 +0100 | [diff] [blame] | 54 | int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, |
| 55 | unsigned int dataoff, enum ip_conntrack_info *ctinfo, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 56 | u_int8_t pf, unsigned int hooknum); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 57 | |
Patrick McHardy | ffaa9c1 | 2008-01-31 04:41:14 -0800 | [diff] [blame] | 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. */ |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 63 | int (*print_conntrack)(struct seq_file *s, struct nf_conn *); |
Patrick McHardy | ffaa9c1 | 2008-01-31 04:41:14 -0800 | [diff] [blame] | 64 | |
Pablo Neira Ayuso | 2c8503f | 2012-02-28 18:23:31 +0100 | [diff] [blame] | 65 | /* Return the array of timeouts for this protocol. */ |
| 66 | unsigned int *(*get_timeouts)(struct net *net); |
| 67 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 68 | /* convert protoinfo to nfnetink attributes */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 69 | int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 70 | struct nf_conn *ct); |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 71 | /* Calculate protoinfo nlattr size */ |
| 72 | int (*nlattr_size)(void); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 73 | |
| 74 | /* convert nfnetlink attributes to protoinfo */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 75 | int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 76 | |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 77 | int (*tuple_to_nlattr)(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 78 | const struct nf_conntrack_tuple *t); |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 79 | /* Calculate tuple nlattr size */ |
| 80 | int (*nlattr_tuple_size)(void); |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 81 | int (*nlattr_to_tuple)(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 82 | struct nf_conntrack_tuple *t); |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 83 | const struct nla_policy *nla_policy; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 84 | |
Holger Eitzenberger | d0dba72 | 2009-03-25 18:24:48 +0100 | [diff] [blame] | 85 | size_t nla_size; |
| 86 | |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 87 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
| 88 | struct { |
| 89 | size_t obj_size; |
Gao feng | 8264deb | 2012-05-28 21:04:23 +0000 | [diff] [blame] | 90 | int (*nlattr_to_obj)(struct nlattr *tb[], |
| 91 | struct net *net, void *data); |
Pablo Neira Ayuso | 5097846 | 2012-02-28 19:13:48 +0100 | [diff] [blame] | 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; |
| 97 | #endif |
Gao feng | 2c352f4 | 2012-05-28 21:04:09 +0000 | [diff] [blame] | 98 | int *net_id; |
| 99 | /* Init l4proto pernet data */ |
Gao feng | f1caad2 | 2012-06-21 04:36:39 +0000 | [diff] [blame] | 100 | int (*init_net)(struct net *net, u_int16_t proto); |
Gao feng | 2c352f4 | 2012-05-28 21:04:09 +0000 | [diff] [blame] | 101 | |
Pablo Neira Ayuso | 0891147 | 2012-06-29 05:23:24 +0000 | [diff] [blame] | 102 | /* Return the per-net protocol part. */ |
| 103 | struct nf_proto_net *(*get_net_proto)(struct net *net); |
| 104 | |
Patrick McHardy | ffaa9c1 | 2008-01-31 04:41:14 -0800 | [diff] [blame] | 105 | /* Protocol name */ |
| 106 | const char *name; |
Patrick McHardy | d62f9ed | 2006-11-29 02:35:17 +0100 | [diff] [blame] | 107 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 108 | /* Module (if any) which this is connected to. */ |
| 109 | struct module *me; |
| 110 | }; |
| 111 | |
Christoph Paasch | 9d2493f | 2009-03-16 15:15:35 +0100 | [diff] [blame] | 112 | /* Existing built-in generic protocol */ |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 113 | extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 114 | |
| 115 | #define MAX_NF_CT_PROTO 256 |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 116 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 117 | extern struct nf_conntrack_l4proto * |
| 118 | __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] | 119 | |
Pablo Neira Ayuso | c1ebd7d | 2012-03-22 23:40:01 +0100 | [diff] [blame] | 120 | extern struct nf_conntrack_l4proto * |
| 121 | nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t l4proto); |
| 122 | extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p); |
| 123 | |
Gao feng | c296bb4 | 2013-01-23 12:51:10 +0100 | [diff] [blame^] | 124 | /* Protocol pernet registration. */ |
| 125 | extern int nf_ct_l4proto_pernet_register(struct net *net, |
Gao feng | 2c352f4 | 2012-05-28 21:04:09 +0000 | [diff] [blame] | 126 | struct nf_conntrack_l4proto *proto); |
Gao feng | c296bb4 | 2013-01-23 12:51:10 +0100 | [diff] [blame^] | 127 | extern void nf_ct_l4proto_pernet_unregister(struct net *net, |
Gao feng | 2c352f4 | 2012-05-28 21:04:09 +0000 | [diff] [blame] | 128 | struct nf_conntrack_l4proto *proto); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 129 | |
Gao feng | c296bb4 | 2013-01-23 12:51:10 +0100 | [diff] [blame^] | 130 | /* Protocol global registration. */ |
| 131 | extern int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto); |
| 132 | extern void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto); |
| 133 | |
Gao feng | f28997e | 2012-06-21 04:36:40 +0000 | [diff] [blame] | 134 | static inline void nf_ct_kfree_compat_sysctl_table(struct nf_proto_net *pn) |
| 135 | { |
| 136 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) |
| 137 | kfree(pn->ctl_compat_table); |
| 138 | pn->ctl_compat_table = NULL; |
| 139 | #endif |
| 140 | } |
| 141 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 142 | /* Generic netlink helpers */ |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 143 | extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 144 | const struct nf_conntrack_tuple *tuple); |
Patrick McHardy | fdf7083 | 2007-09-28 14:37:41 -0700 | [diff] [blame] | 145 | extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 146 | struct nf_conntrack_tuple *t); |
Holger Eitzenberger | 5c0de29 | 2009-03-25 21:52:17 +0100 | [diff] [blame] | 147 | extern int nf_ct_port_nlattr_tuple_size(void); |
Patrick McHardy | f73e924 | 2007-09-28 14:39:55 -0700 | [diff] [blame] | 148 | extern const struct nla_policy nf_ct_port_nla_policy[]; |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 149 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 150 | #ifdef CONFIG_SYSCTL |
| 151 | #ifdef DEBUG_INVALID_PACKETS |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 152 | #define LOG_INVALID(net, proto) \ |
| 153 | ((net)->ct.sysctl_log_invalid == (proto) || \ |
| 154 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 155 | #else |
Alexey Dobriyan | c2a2c7e | 2008-10-08 11:35:08 +0200 | [diff] [blame] | 156 | #define LOG_INVALID(net, proto) \ |
| 157 | (((net)->ct.sysctl_log_invalid == (proto) || \ |
| 158 | (net)->ct.sysctl_log_invalid == IPPROTO_RAW) \ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 159 | && net_ratelimit()) |
| 160 | #endif |
| 161 | #else |
Ingo Molnar | 65f233f | 2008-11-25 18:20:13 +0100 | [diff] [blame] | 162 | static inline int LOG_INVALID(struct net *net, int proto) { return 0; } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 163 | #endif /* CONFIG_SYSCTL */ |
| 164 | |
| 165 | #endif /*_NF_CONNTRACK_PROTOCOL_H*/ |