include/net/netfilter/nf_log.h

   1 #ifndef _NF_LOG_H
   2 #define _NF_LOG_H
   3
   4 #include <linux/netfilter.h>
   5
   6 /* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
   7  * disappear once iptables is replaced with pkttables.  Please DO NOT use them
   8  * for any new code! */
   9 #define NF_LOG_TCPSEQ           0x01    /* Log TCP sequence numbers */
  10 #define NF_LOG_TCPOPT           0x02    /* Log TCP options */
  11 #define NF_LOG_IPOPT            0x04    /* Log IP options */
  12 #define NF_LOG_UID              0x08    /* Log UID owning local socket */
  13 #define NF_LOG_MASK             0x0f
  14
  15 enum nf_log_type {
  16         NF_LOG_TYPE_LOG         = 0,
  17         NF_LOG_TYPE_ULOG,
  18         NF_LOG_TYPE_MAX
  19 };
  20
  21 struct nf_loginfo {
  22         u_int8_t type;
  23         union {
  24                 struct {
  25                         u_int32_t copy_len;
  26                         u_int16_t group;
  27                         u_int16_t qthreshold;
  28                 } ulog;
  29                 struct {
  30                         u_int8_t level;
  31                         u_int8_t logflags;
  32                 } log;
  33         } u;
  34 };
  35
  36 typedef void nf_logfn(struct net *net,
  37                       u_int8_t pf,
  38                       unsigned int hooknum,
  39                       const struct sk_buff *skb,
  40                       const struct net_device *in,
  41                       const struct net_device *out,
  42                       const struct nf_loginfo *li,
  43                       const char *prefix);
  44
  45 struct nf_logger {
  46         char                    *name;
  47         enum nf_log_type        type;
  48         nf_logfn                *logfn;
  49         struct module           *me;
  50 };
  51
  52 /* Function to register/unregister log function. */
  53 int nf_log_register(u_int8_t pf, struct nf_logger *logger);
  54 void nf_log_unregister(struct nf_logger *logger);
  55
  56 void nf_log_set(struct net *net, u_int8_t pf,
  57                 const struct nf_logger *logger);
  58 void nf_log_unset(struct net *net, const struct nf_logger *logger);
  59
  60 int nf_log_bind_pf(struct net *net, u_int8_t pf,
  61                    const struct nf_logger *logger);
  62 void nf_log_unbind_pf(struct net *net, u_int8_t pf);
  63
  64 int nf_logger_find_get(int pf, enum nf_log_type type);
  65 void nf_logger_put(int pf, enum nf_log_type type);
  66 void nf_logger_request_module(int pf, enum nf_log_type type);
  67
  68 #define MODULE_ALIAS_NF_LOGGER(family, type) \
  69         MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
  70
  71 /* Calls the registered backend logging function */
  72 __printf(8, 9)
  73 void nf_log_packet(struct net *net,
  74                    u_int8_t pf,
  75                    unsigned int hooknum,
  76                    const struct sk_buff *skb,
  77                    const struct net_device *in,
  78                    const struct net_device *out,
  79                    const struct nf_loginfo *li,
  80                    const char *fmt, ...);
  81
  82 struct nf_log_buf;
  83
  84 struct nf_log_buf *nf_log_buf_open(void);
  85 __printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
  86 void nf_log_buf_close(struct nf_log_buf *m);
  87
  88 /* common logging functions */
  89 int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
  90                            u8 proto, int fragment, unsigned int offset);
  91 int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
  92                            u8 proto, int fragment, unsigned int offset,
  93                            unsigned int logflags);
  94 void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk);
  95 void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
  96                                unsigned int hooknum, const struct sk_buff *skb,
  97                                const struct net_device *in,
  98                                const struct net_device *out,
  99                                const struct nf_loginfo *loginfo,
 100                                const char *prefix);
 101
 102 #endif /* _NF_LOG_H */