/* 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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/* L3 Protocol number. */
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u_int16_t l3proto;
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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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/* Try to fill in the third arg: dataoff is offset past network protocol
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hdr. Return true if possible. */
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bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
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struct net *net, struct nf_conntrack_tuple *tuple);
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/* Invert the per-proto part of the tuple: ie. turn xmit into reply.
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* Only used by icmp, most protocols use a generic version.
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*/
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bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
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const struct nf_conntrack_tuple *orig);
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/* Returns verdict for packet, or -1 for invalid. */
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int (*packet)(struct nf_conn *ct,
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const struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo);
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/* Called when a new connection for this protocol found;
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* returns TRUE if it's OK. If so, packet() called next. */
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bool (*new)(struct nf_conn *ct, const struct sk_buff *skb,
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unsigned int dataoff);
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/* Called when a conntrack entry is destroyed */
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void (*destroy)(struct nf_conn *ct);
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int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
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unsigned int dataoff,
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u_int8_t pf, unsigned int hooknum);
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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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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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unsigned int *net_id;
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/* Init l4proto pernet data */
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int (*init_net)(struct net *net, u_int16_t proto);
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/* Return the per-net protocol part. */
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struct nf_proto_net *(*get_net_proto)(struct net *net);
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/* Module (if any) which this is connected to. */
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struct module *me;
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};
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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 256
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const struct nf_conntrack_l4proto *__nf_ct_l4proto_find(u_int16_t l3proto,
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u_int8_t l4proto);
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const struct nf_conntrack_l4proto *nf_ct_l4proto_find_get(u_int16_t l3proto,
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u_int8_t l4proto);
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void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p);
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/* Protocol pernet registration. */
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int nf_ct_l4proto_pernet_register_one(struct net *net,
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const struct nf_conntrack_l4proto *proto);
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void nf_ct_l4proto_pernet_unregister_one(struct net *net,
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const struct nf_conntrack_l4proto *proto);
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int nf_ct_l4proto_pernet_register(struct net *net,
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const struct nf_conntrack_l4proto *const proto[],
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unsigned int num_proto);
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void nf_ct_l4proto_pernet_unregister(struct net *net,
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const struct nf_conntrack_l4proto *const proto[],
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unsigned int num_proto);
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/* Protocol global registration. */
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int nf_ct_l4proto_register_one(const struct nf_conntrack_l4proto *proto);
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void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *proto);
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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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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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#endif /*_NF_CONNTRACK_PROTOCOL_H*/
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