/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NF_LOG_H
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#define _NF_LOG_H
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_log.h>
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/* Log tcp sequence, tcp options, ip options and uid owning local socket */
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#define NF_LOG_DEFAULT_MASK 0x0f
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/* This flag indicates that copy_len field in nf_loginfo is set */
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#define NF_LOG_F_COPY_LEN 0x1
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enum nf_log_type {
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NF_LOG_TYPE_LOG = 0,
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NF_LOG_TYPE_ULOG,
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NF_LOG_TYPE_MAX
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};
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struct nf_loginfo {
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u_int8_t type;
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union {
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struct {
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/* copy_len will be used iff you set
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* NF_LOG_F_COPY_LEN in flags
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*/
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u_int32_t copy_len;
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u_int16_t group;
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u_int16_t qthreshold;
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u_int16_t flags;
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} ulog;
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struct {
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u_int8_t level;
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u_int8_t logflags;
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} log;
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} u;
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};
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typedef void nf_logfn(struct net *net,
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u_int8_t pf,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *li,
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const char *prefix);
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struct nf_logger {
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char *name;
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enum nf_log_type type;
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nf_logfn *logfn;
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struct module *me;
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};
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/* sysctl_nf_log_all_netns - allow LOG target in all network namespaces */
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extern int sysctl_nf_log_all_netns;
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/* Function to register/unregister log function. */
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int nf_log_register(u_int8_t pf, struct nf_logger *logger);
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void nf_log_unregister(struct nf_logger *logger);
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int nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger);
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void nf_log_unset(struct net *net, const struct nf_logger *logger);
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int nf_log_bind_pf(struct net *net, u_int8_t pf,
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const struct nf_logger *logger);
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void nf_log_unbind_pf(struct net *net, u_int8_t pf);
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int nf_logger_find_get(int pf, enum nf_log_type type);
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void nf_logger_put(int pf, enum nf_log_type type);
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void nf_logger_request_module(int pf, enum nf_log_type type);
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#define MODULE_ALIAS_NF_LOGGER(family, type) \
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MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
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/* Calls the registered backend logging function */
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__printf(8, 9)
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void nf_log_packet(struct net *net,
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u_int8_t pf,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *li,
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const char *fmt, ...);
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__printf(8, 9)
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void nf_log_trace(struct net *net,
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u_int8_t pf,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *li,
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const char *fmt, ...);
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struct nf_log_buf;
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struct nf_log_buf *nf_log_buf_open(void);
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__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
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void nf_log_buf_close(struct nf_log_buf *m);
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/* common logging functions */
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int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
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u8 proto, int fragment, unsigned int offset);
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int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
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u8 proto, int fragment, unsigned int offset,
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unsigned int logflags);
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void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
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struct sock *sk);
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void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb);
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void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
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unsigned int hooknum, const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo,
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const char *prefix);
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void nf_log_l2packet(struct net *net, u_int8_t pf,
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__be16 protocol,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo, const char *prefix);
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#endif /* _NF_LOG_H */
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