include/net/netfilter/nf_log.h

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