diff options
Diffstat (limited to 'include/net/netfilter/nf_conntrack_l4proto.h')
| -rw-r--r-- | include/net/netfilter/nf_conntrack_l4proto.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h new file mode 100644 index 000000000..1f7061313 --- /dev/null +++ b/include/net/netfilter/nf_conntrack_l4proto.h @@ -0,0 +1,158 @@ +/* + * Header for use in defining a given L4 protocol for connection tracking. + * + * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> + * - generalized L3 protocol dependent part. + * + * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h + */ + +#ifndef _NF_CONNTRACK_L4PROTO_H +#define _NF_CONNTRACK_L4PROTO_H +#include <linux/netlink.h> +#include <net/netlink.h> +#include <net/netfilter/nf_conntrack.h> +#include <net/netns/generic.h> + +struct seq_file; + +struct nf_conntrack_l4proto { + /* L3 Protocol number. */ + u_int16_t l3proto; + + /* L4 Protocol number. */ + u_int8_t l4proto; + + /* Try to fill in the third arg: dataoff is offset past network protocol + hdr. Return true if possible. */ + bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff, + struct nf_conntrack_tuple *tuple); + + /* Invert the per-proto part of the tuple: ie. turn xmit into reply. + * Some packets can't be inverted: return 0 in that case. + */ + bool (*invert_tuple)(struct nf_conntrack_tuple *inverse, + const struct nf_conntrack_tuple *orig); + + /* Returns verdict for packet, or -1 for invalid. */ + int (*packet)(struct nf_conn *ct, + const struct sk_buff *skb, + unsigned int dataoff, + enum ip_conntrack_info ctinfo, + u_int8_t pf, + unsigned int hooknum, + unsigned int *timeouts); + + /* Called when a new connection for this protocol found; + * returns TRUE if it's OK. If so, packet() called next. */ + bool (*new)(struct nf_conn *ct, const struct sk_buff *skb, + unsigned int dataoff, unsigned int *timeouts); + + /* Called when a conntrack entry is destroyed */ + void (*destroy)(struct nf_conn *ct); + + int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, + unsigned int dataoff, enum ip_conntrack_info *ctinfo, + u_int8_t pf, unsigned int hooknum); + + /* Print out the per-protocol part of the tuple. Return like seq_* */ + void (*print_tuple)(struct seq_file *s, + const struct nf_conntrack_tuple *); + + /* Print out the private part of the conntrack. */ + void (*print_conntrack)(struct seq_file *s, struct nf_conn *); + + /* Return the array of timeouts for this protocol. */ + unsigned int *(*get_timeouts)(struct net *net); + + /* convert protoinfo to nfnetink attributes */ + int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla, + struct nf_conn *ct); + /* Calculate protoinfo nlattr size */ + int (*nlattr_size)(void); + + /* convert nfnetlink attributes to protoinfo */ + int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct); + + int (*tuple_to_nlattr)(struct sk_buff *skb, + const struct nf_conntrack_tuple *t); + /* Calculate tuple nlattr size */ + int (*nlattr_tuple_size)(void); + int (*nlattr_to_tuple)(struct nlattr *tb[], + struct nf_conntrack_tuple *t); + const struct nla_policy *nla_policy; + + size_t nla_size; + +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + struct { + size_t obj_size; + int (*nlattr_to_obj)(struct nlattr *tb[], + struct net *net, void *data); + int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); + + unsigned int nlattr_max; + const struct nla_policy *nla_policy; + } ctnl_timeout; +#endif + int *net_id; + /* Init l4proto pernet data */ + int (*init_net)(struct net *net, u_int16_t proto); + + /* Return the per-net protocol part. */ + struct nf_proto_net *(*get_net_proto)(struct net *net); + + /* Protocol name */ + const char *name; + + /* Module (if any) which this is connected to. */ + struct module *me; +}; + +/* Existing built-in generic protocol */ +extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic; + +#define MAX_NF_CT_PROTO 256 + +struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto, + u_int8_t l4proto); + +struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto, + u_int8_t l4proto); +void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p); + +/* Protocol pernet registration. */ +int nf_ct_l4proto_pernet_register(struct net *net, + struct nf_conntrack_l4proto *proto); +void nf_ct_l4proto_pernet_unregister(struct net *net, + struct nf_conntrack_l4proto *proto); + +/* Protocol global registration. */ +int nf_ct_l4proto_register(struct nf_conntrack_l4proto *proto); +void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *proto); + +static inline void nf_ct_kfree_compat_sysctl_table(struct nf_proto_net *pn) +{ +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) + kfree(pn->ctl_compat_table); + pn->ctl_compat_table = NULL; +#endif +} + +/* Generic netlink helpers */ +int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, + const struct nf_conntrack_tuple *tuple); +int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], + struct nf_conntrack_tuple *t); +int nf_ct_port_nlattr_tuple_size(void); +extern const struct nla_policy nf_ct_port_nla_policy[]; + +#ifdef CONFIG_SYSCTL +#define LOG_INVALID(net, proto) \ + ((net)->ct.sysctl_log_invalid == (proto) || \ + (net)->ct.sysctl_log_invalid == IPPROTO_RAW) +#else +static inline int LOG_INVALID(struct net *net, int proto) { return 0; } +#endif /* CONFIG_SYSCTL */ + +#endif /*_NF_CONNTRACK_PROTOCOL_H*/ |