/* SPDX-License-Identifier: GPL-2.0 */
/*
* Header for use in defining a given L4 protocol for connection tracking.
*
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <[email protected]>
* - 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 {
/* L4 Protocol number. */
u_int8_t l4proto;
/* Resolve clashes on insertion races. */
bool allow_clash;
/* protoinfo nlattr size, closes a hole */
u16 nlattr_size;
/* called by gc worker if table is full */
bool (*can_early_drop)(const struct nf_conn *ct);
/* convert protoinfo to nfnetink attributes */
int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
struct nf_conn *ct, bool destroy);
/* 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 */
unsigned int (*nlattr_tuple_size)(void);
int (*nlattr_to_tuple)(struct nlattr *tb[],
struct nf_conntrack_tuple *t,
u_int32_t flags);
const struct nla_policy *nla_policy;
struct {
int (*nlattr_to_obj)(struct nlattr *tb[],
struct net *net, void *data);
int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
u16 obj_size;
u16 nlattr_max;
const struct nla_policy *nla_policy;
} ctnl_timeout;
#ifdef CONFIG_NF_CONNTRACK_PROCFS
/* Print out the private part of the conntrack. */
void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
#endif
};
bool icmp_pkt_to_tuple(const struct sk_buff *skb,
unsigned int dataoff,
struct net *net,
struct nf_conntrack_tuple *tuple);
bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
unsigned int dataoff,
struct net *net,
struct nf_conntrack_tuple *tuple);
bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig);
bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig);
int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
unsigned int dataoff,
const struct nf_hook_state *state,
u8 l4proto,
union nf_inet_addr *outer_daddr);
int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
const struct nf_hook_state *state);
int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
const struct nf_hook_state *state);
int nf_conntrack_icmp_packet(struct nf_conn *ct,
struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_udp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_udplite_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_tcp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_dccp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_sctp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_gre_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
void nf_conntrack_generic_init_net(struct net *net);
void nf_conntrack_tcp_init_net(struct net *net);
void nf_conntrack_udp_init_net(struct net *net);
void nf_conntrack_gre_init_net(struct net *net);
void nf_conntrack_dccp_init_net(struct net *net);
void nf_conntrack_sctp_init_net(struct net *net);
void nf_conntrack_icmp_init_net(struct net *net);
void nf_conntrack_icmpv6_init_net(struct net *net);
/* Existing built-in generic protocol */
extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
#define MAX_NF_CT_PROTO IPPROTO_UDPLITE
const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
/* 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,
u_int32_t flags);
unsigned int nf_ct_port_nlattr_tuple_size(void);
extern const struct nla_policy nf_ct_port_nla_policy[];
#ifdef CONFIG_SYSCTL
__printf(4, 5) __cold
void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
const struct nf_conn *ct,
const struct nf_hook_state *state,
const char *fmt, ...);
__printf(4, 5) __cold
void nf_l4proto_log_invalid(const struct sk_buff *skb,
const struct nf_hook_state *state,
u8 protonum,
const char *fmt, ...);
#else
static inline __printf(4, 5) __cold
void nf_l4proto_log_invalid(const struct sk_buff *skb,
const struct nf_hook_state *state,
u8 protonum,
const char *fmt, ...) {}
static inline __printf(4, 5) __cold
void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
const struct nf_conn *ct,
const struct nf_hook_state *state,
const char *fmt, ...) { }
#endif /* CONFIG_SYSCTL */
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.generic;
}
static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.tcp;
}
static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.udp;
}
static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.icmp;
}
static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.icmpv6;
}
/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */
static inline void nf_ct_set_tcp_be_liberal(struct nf_conn *ct)
{
ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
}
/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */
static inline bool nf_conntrack_tcp_established(const struct nf_conn *ct)
{
return ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED &&
test_bit(IPS_ASSURED_BIT, &ct->status);
}
#endif
#ifdef CONFIG_NF_CT_PROTO_DCCP
static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.dccp;
}
#endif
#ifdef CONFIG_NF_CT_PROTO_SCTP
static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.sctp;
}
#endif
#ifdef CONFIG_NF_CT_PROTO_GRE
static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.gre;
}
#endif
#endif /*_NF_CONNTRACK_PROTOCOL_H*/
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