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- /*
- * 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 net *net, 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*/
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