include/net/netfilter/nf_log.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NF_LOG_H
   3 #define _NF_LOG_H
   4
   5 #include <linux/netfilter.h>
   6 #include <linux/netfilter/nf_log.h>
   7
   8 /* Log tcp sequence, tcp options, ip options and uid owning local socket */
   9 #define NF_LOG_DEFAULT_MASK     0x0f
  10
  11 /* This flag indicates that copy_len field in nf_loginfo is set */
  12 #define NF_LOG_F_COPY_LEN       0x1
  13
  14 enum nf_log_type {
  15         NF_LOG_TYPE_LOG         = 0,
  16         NF_LOG_TYPE_ULOG,
  17         NF_LOG_TYPE_MAX
  18 };
  19
  20 struct nf_loginfo {
  21         u_int8_t type;
  22         union {
  23                 struct {
  24                         /* copy_len will be used iff you set
  25                          * NF_LOG_F_COPY_LEN in flags
  26                          */
  27                         u_int32_t copy_len;
  28                         u_int16_t group;
  29                         u_int16_t qthreshold;
  30                         u_int16_t flags;
  31                 } ulog;
  32                 struct {
  33                         u_int8_t level;
  34                         u_int8_t logflags;
  35                 } log;
  36         } u;
  37 };
  38
  39 typedef void nf_logfn(struct net *net,
  40                       u_int8_t pf,
  41                       unsigned int hooknum,
  42                       const struct sk_buff *skb,
  43                       const struct net_device *in,
  44                       const struct net_device *out,
  45                       const struct nf_loginfo *li,
  46                       const char *prefix);
  47
  48 struct nf_logger {
  49         char                    *name;
  50         enum nf_log_type        type;
  51         nf_logfn                *logfn;
  52         struct module           *me;
  53 };
  54
  55 /* sysctl_nf_log_all_netns - allow LOG target in all network namespaces */
  56 extern int sysctl_nf_log_all_netns;
  57
  58 /* Function to register/unregister log function. */
  59 int nf_log_register(u_int8_t pf, struct nf_logger *logger);
  60 void nf_log_unregister(struct nf_logger *logger);
  61
  62 int nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger);
  63 void nf_log_unset(struct net *net, const struct nf_logger *logger);
  64
  65 int nf_log_bind_pf(struct net *net, u_int8_t pf,
  66                    const struct nf_logger *logger);
  67 void nf_log_unbind_pf(struct net *net, u_int8_t pf);
  68
  69 int nf_logger_find_get(int pf, enum nf_log_type type);
  70 void nf_logger_put(int pf, enum nf_log_type type);
  71 void nf_logger_request_module(int pf, enum nf_log_type type);
  72
  73 #define MODULE_ALIAS_NF_LOGGER(family, type) \
  74         MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
  75
  76 /* Calls the registered backend logging function */
  77 __printf(8, 9)
  78 void nf_log_packet(struct net *net,
  79                    u_int8_t pf,
  80                    unsigned int hooknum,
  81                    const struct sk_buff *skb,
  82                    const struct net_device *in,
  83                    const struct net_device *out,
  84                    const struct nf_loginfo *li,
  85                    const char *fmt, ...);
  86
  87 __printf(8, 9)
  88 void nf_log_trace(struct net *net,
  89                   u_int8_t pf,
  90                   unsigned int hooknum,
  91                   const struct sk_buff *skb,
  92                   const struct net_device *in,
  93                   const struct net_device *out,
  94                   const struct nf_loginfo *li,
  95                   const char *fmt, ...);
  96
  97 struct nf_log_buf;
  98
  99 struct nf_log_buf *nf_log_buf_open(void);
 100 __printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
 101 void nf_log_buf_close(struct nf_log_buf *m);
 102
 103 /* common logging functions */
 104 int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
 105                            u8 proto, int fragment, unsigned int offset);
 106 int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
 107                            u8 proto, int fragment, unsigned int offset,
 108                            unsigned int logflags);
 109 void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk);
 110 void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
 111                                unsigned int hooknum, const struct sk_buff *skb,
 112                                const struct net_device *in,
 113                                const struct net_device *out,
 114                                const struct nf_loginfo *loginfo,
 115                                const char *prefix);
 116 void nf_log_l2packet(struct net *net, u_int8_t pf,
 117                      __be16 protocol,
 118                      unsigned int hooknum,
 119                      const struct sk_buff *skb,
 120                      const struct net_device *in,
 121                      const struct net_device *out,
 122                      const struct nf_loginfo *loginfo, const char *prefix);
 123
 124 #endif /* _NF_LOG_H */