include/linux/netfilter_bridge/ebt_802_3.h

   1 #ifndef __LINUX_BRIDGE_EBT_802_3_H
   2 #define __LINUX_BRIDGE_EBT_802_3_H
   3
   4 #define EBT_802_3_SAP 0x01
   5 #define EBT_802_3_TYPE 0x02
   6
   7 #define EBT_802_3_MATCH "802_3"
   8
   9 /*
  10  * If frame has DSAP/SSAP value 0xaa you must check the SNAP type
  11  * to discover what kind of packet we're carrying.
  12  */
  13 #define CHECK_TYPE 0xaa
  14
  15 /*
  16  * Control field may be one or two bytes.  If the first byte has
  17  * the value 0x03 then the entire length is one byte, otherwise it is two.
  18  * One byte controls are used in Unnumbered Information frames.
  19  * Two byte controls are used in Numbered Information frames.
  20  */
  21 #define IS_UI 0x03
  22
  23 #define EBT_802_3_MASK (EBT_802_3_SAP | EBT_802_3_TYPE | EBT_802_3)
  24
  25 /* ui has one byte ctrl, ni has two */
  26 struct hdr_ui {
  27         uint8_t dsap;
  28         uint8_t ssap;
  29         uint8_t ctrl;
  30         uint8_t orig[3];
  31         uint16_t type;
  32 };
  33
  34 struct hdr_ni {
  35         uint8_t dsap;
  36         uint8_t ssap;
  37         uint16_t ctrl;
  38         uint8_t  orig[3];
  39         uint16_t type;
  40 };
  41
  42 struct ebt_802_3_hdr {
  43         uint8_t  daddr[6];
  44         uint8_t  saddr[6];
  45         uint16_t len;
  46         union {
  47                 struct hdr_ui ui;
  48                 struct hdr_ni ni;
  49         } llc;
  50 };
  51
  52 #ifdef __KERNEL__
  53 #include <linux/skbuff.h>
  54
  55 static inline struct ebt_802_3_hdr *ebt_802_3_hdr(const struct sk_buff *skb)
  56 {
  57         return (struct ebt_802_3_hdr *)skb->mac.raw;
  58 }
  59 #endif
  60
  61 struct ebt_802_3_info
  62 {
  63         uint8_t  sap;
  64         uint16_t type;
  65         uint8_t  bitmask;
  66         uint8_t  invflags;
  67 };
  68
  69 #endif