/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Header for use in defining a given L4 protocol for connection tracking.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalized L3 protocol dependent part.
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*
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* Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
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*/
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#ifndef _NF_CONNTRACK_L4PROTO_H
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#define _NF_CONNTRACK_L4PROTO_H
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#include <linux/netlink.h>
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#include <net/netlink.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netns/generic.h>
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struct seq_file;
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struct nf_conntrack_l4proto {
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/* L4 Protocol number. */
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u_int8_t l4proto;
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/* Resolve clashes on insertion races. */
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bool allow_clash;
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/* protoinfo nlattr size, closes a hole */
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u16 nlattr_size;
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/* called by gc worker if table is full */
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bool (*can_early_drop)(const struct nf_conn *ct);
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/* convert protoinfo to nfnetink attributes */
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int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
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struct nf_conn *ct);
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/* convert nfnetlink attributes to protoinfo */
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int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
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int (*tuple_to_nlattr)(struct sk_buff *skb,
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const struct nf_conntrack_tuple *t);
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/* Calculate tuple nlattr size */
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unsigned int (*nlattr_tuple_size)(void);
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int (*nlattr_to_tuple)(struct nlattr *tb[],
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struct nf_conntrack_tuple *t,
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u_int32_t flags);
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const struct nla_policy *nla_policy;
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struct {
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int (*nlattr_to_obj)(struct nlattr *tb[],
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struct net *net, void *data);
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int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
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u16 obj_size;
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u16 nlattr_max;
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const struct nla_policy *nla_policy;
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} ctnl_timeout;
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#ifdef CONFIG_NF_CONNTRACK_PROCFS
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/* Print out the private part of the conntrack. */
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void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
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#endif
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};
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bool icmp_pkt_to_tuple(const struct sk_buff *skb,
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unsigned int dataoff,
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struct net *net,
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struct nf_conntrack_tuple *tuple);
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bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
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unsigned int dataoff,
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struct net *net,
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struct nf_conntrack_tuple *tuple);
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bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple *orig);
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bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple *orig);
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int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
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unsigned int dataoff,
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const struct nf_hook_state *state,
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u8 l4proto,
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union nf_inet_addr *outer_daddr);
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int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
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struct sk_buff *skb,
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unsigned int dataoff,
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const struct nf_hook_state *state);
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int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
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struct sk_buff *skb,
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unsigned int dataoff,
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const struct nf_hook_state *state);
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int nf_conntrack_icmp_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_udp_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_udplite_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_tcp_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_dccp_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_sctp_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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int nf_conntrack_gre_packet(struct nf_conn *ct,
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struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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const struct nf_hook_state *state);
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void nf_conntrack_generic_init_net(struct net *net);
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void nf_conntrack_tcp_init_net(struct net *net);
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void nf_conntrack_udp_init_net(struct net *net);
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void nf_conntrack_gre_init_net(struct net *net);
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void nf_conntrack_dccp_init_net(struct net *net);
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void nf_conntrack_sctp_init_net(struct net *net);
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void nf_conntrack_icmp_init_net(struct net *net);
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void nf_conntrack_icmpv6_init_net(struct net *net);
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/* Existing built-in generic protocol */
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extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
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#define MAX_NF_CT_PROTO IPPROTO_UDPLITE
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const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
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/* Generic netlink helpers */
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int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
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const struct nf_conntrack_tuple *tuple);
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int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
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struct nf_conntrack_tuple *t,
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u_int32_t flags);
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unsigned int nf_ct_port_nlattr_tuple_size(void);
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extern const struct nla_policy nf_ct_port_nla_policy[];
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#ifdef CONFIG_SYSCTL
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__printf(3, 4) __cold
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void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
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const struct nf_conn *ct,
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const char *fmt, ...);
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__printf(5, 6) __cold
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void nf_l4proto_log_invalid(const struct sk_buff *skb,
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struct net *net,
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u16 pf, u8 protonum,
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const char *fmt, ...);
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#else
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static inline __printf(5, 6) __cold
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void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
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u16 pf, u8 protonum, const char *fmt, ...) {}
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static inline __printf(3, 4) __cold
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void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
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const struct nf_conn *ct,
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const char *fmt, ...) { }
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#endif /* CONFIG_SYSCTL */
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.generic;
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}
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static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.tcp;
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}
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static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.udp;
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}
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static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.icmp;
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}
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static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.icmpv6;
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}
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#endif
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#ifdef CONFIG_NF_CT_PROTO_DCCP
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static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.dccp;
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}
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#endif
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#ifdef CONFIG_NF_CT_PROTO_SCTP
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static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.sctp;
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}
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#endif
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#ifdef CONFIG_NF_CT_PROTO_GRE
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static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.gre;
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}
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#endif
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#endif /*_NF_CONNTRACK_PROTOCOL_H*/
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