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pkt_cls.h

#ifndef __LINUX_PKT_CLS_H
#define __LINUX_PKT_CLS_H

/* I think i could have done better macros ; for now this is stolen from
 * some arch/mips code - jhs
*/
#define _TC_MAKE32(x) ((x))

#define _TC_MAKEMASK1(n) (_TC_MAKE32(1) << _TC_MAKE32(n))
#define _TC_MAKEMASK(v,n) (_TC_MAKE32((_TC_MAKE32(1)<<(v))-1) << _TC_MAKE32(n))
#define _TC_MAKEVALUE(v,n) (_TC_MAKE32(v) << _TC_MAKE32(n))
#define _TC_GETVALUE(v,n,m) ((_TC_MAKE32(v) & _TC_MAKE32(m)) >> _TC_MAKE32(n))

/* verdict bit breakdown 
 *
bit 0: when set -> this packet has been munged already

bit 1: when set -> It is ok to munge this packet

bit 2,3,4,5: Reclassify counter - sort of reverse TTL - if exceeded
assume loop

bit 6,7: Where this packet was last seen 
0: Above the transmit example at the socket level
1: on the Ingress
2: on the Egress

bit 8: when set --> Request not to classify on ingress. 

bits 9,10,11: redirect counter -  redirect TTL. Loop avoidance

 *
 * */

#define TC_MUNGED          _TC_MAKEMASK1(0)
#define SET_TC_MUNGED(v)   ( TC_MUNGED | (v & ~TC_MUNGED))
#define CLR_TC_MUNGED(v)   ( v & ~TC_MUNGED)

#define TC_OK2MUNGE        _TC_MAKEMASK1(1)
#define SET_TC_OK2MUNGE(v)   ( TC_OK2MUNGE | (v & ~TC_OK2MUNGE))
#define CLR_TC_OK2MUNGE(v)   ( v & ~TC_OK2MUNGE)

#define S_TC_VERD          _TC_MAKE32(2)
#define M_TC_VERD          _TC_MAKEMASK(4,S_TC_VERD)
#define G_TC_VERD(x)       _TC_GETVALUE(x,S_TC_VERD,M_TC_VERD)
#define V_TC_VERD(x)       _TC_MAKEVALUE(x,S_TC_VERD)
#define SET_TC_VERD(v,n)   ((V_TC_VERD(n)) | (v & ~M_TC_VERD))

#define S_TC_FROM          _TC_MAKE32(6)
#define M_TC_FROM          _TC_MAKEMASK(2,S_TC_FROM)
#define G_TC_FROM(x)       _TC_GETVALUE(x,S_TC_FROM,M_TC_FROM)
#define V_TC_FROM(x)       _TC_MAKEVALUE(x,S_TC_FROM)
#define SET_TC_FROM(v,n)   ((V_TC_FROM(n)) | (v & ~M_TC_FROM))
#define AT_STACK  0x0
#define AT_INGRESS      0x1
#define AT_EGRESS 0x2

#define TC_NCLS          _TC_MAKEMASK1(8)
#define SET_TC_NCLS(v)   ( TC_NCLS | (v & ~TC_NCLS))
#define CLR_TC_NCLS(v)   ( v & ~TC_NCLS)

#define S_TC_RTTL          _TC_MAKE32(9)
#define M_TC_RTTL          _TC_MAKEMASK(3,S_TC_RTTL)
#define G_TC_RTTL(x)       _TC_GETVALUE(x,S_TC_RTTL,M_TC_RTTL)
#define V_TC_RTTL(x)       _TC_MAKEVALUE(x,S_TC_RTTL)
#define SET_TC_RTTL(v,n)   ((V_TC_RTTL(n)) | (v & ~M_TC_RTTL))

#define S_TC_AT          _TC_MAKE32(12)
#define M_TC_AT          _TC_MAKEMASK(2,S_TC_AT)
#define G_TC_AT(x)       _TC_GETVALUE(x,S_TC_AT,M_TC_AT)
#define V_TC_AT(x)       _TC_MAKEVALUE(x,S_TC_AT)
#define SET_TC_AT(v,n)   ((V_TC_AT(n)) | (v & ~M_TC_AT))

/* Action attributes */
enum
{
      TCA_ACT_UNSPEC,
      TCA_ACT_KIND,
      TCA_ACT_OPTIONS,
      TCA_ACT_INDEX,
      __TCA_ACT_MAX
};

#define TCA_ACT_MAX __TCA_ACT_MAX
#define TCA_OLD_COMPAT (TCA_ACT_MAX+1)
#define TCA_ACT_MAX_PRIO 32
#define TCA_ACT_BIND    1
#define TCA_ACT_NOBIND  0
#define TCA_ACT_UNBIND  1
#define TCA_ACT_NOUNBIND      0
#define TCA_ACT_REPLACE       1
#define TCA_ACT_NOREPLACE     0
#define MAX_REC_LOOP 4
#define MAX_RED_LOOP 4

#define TC_ACT_UNSPEC   (-1)
#define TC_ACT_OK       0
#define TC_ACT_RECLASSIFY     1
#define TC_ACT_SHOT           2
#define TC_ACT_PIPE           3
#define TC_ACT_STOLEN         4
#define TC_ACT_QUEUED         5
#define TC_ACT_REPEAT         6
#define TC_ACT_JUMP           0x10000000

/* Action type identifiers*/
enum
{
      TCA_ID_UNSPEC=0,
      TCA_ID_POLICE=1,
      /* other actions go here */
      __TCA_ID_MAX=255
};

#define TCA_ID_MAX __TCA_ID_MAX

00117 struct tc_police
{
      __u32             index;
      int               action;
#define TC_POLICE_UNSPEC      TC_ACT_UNSPEC
#define TC_POLICE_OK          TC_ACT_OK
#define TC_POLICE_RECLASSIFY  TC_ACT_RECLASSIFY
#define TC_POLICE_SHOT        TC_ACT_SHOT
#define TC_POLICE_PIPE        TC_ACT_PIPE

      __u32             limit;
      __u32             burst;
      __u32             mtu;
      struct tc_ratespec      rate;
      struct tc_ratespec      peakrate;
      int               refcnt;
      int               bindcnt;
      __u32             capab;
};

00137 struct tcf_t
{
      __u32   install;
      __u32   lastuse;
      __u32   expires;
};

00144 struct tc_cnt
{
      int                   refcnt; 
      int                   bindcnt;
};

#define tc_gen \
      __u32                 index; \
      __u32                 capab; \
      int                   action; \
      int                   refcnt; \
      int                   bindcnt

enum
{
      TCA_POLICE_UNSPEC,
      TCA_POLICE_TBF,
      TCA_POLICE_RATE,
      TCA_POLICE_PEAKRATE,
      TCA_POLICE_AVRATE,
      TCA_POLICE_RESULT,
      __TCA_POLICE_MAX
#define TCA_POLICE_RESULT TCA_POLICE_RESULT
};

#define TCA_POLICE_MAX (__TCA_POLICE_MAX - 1)

/* U32 filters */

#define TC_U32_HTID(h) ((h)&0xFFF00000)
#define TC_U32_USERHTID(h) (TC_U32_HTID(h)>>20)
#define TC_U32_HASH(h) (((h)>>12)&0xFF)
#define TC_U32_NODE(h) ((h)&0xFFF)
#define TC_U32_KEY(h) ((h)&0xFFFFF)
#define TC_U32_UNSPEC   0
#define TC_U32_ROOT     (0xFFF00000)

enum
{
      TCA_U32_UNSPEC,
      TCA_U32_CLASSID,
      TCA_U32_HASH,
      TCA_U32_LINK,
      TCA_U32_DIVISOR,
      TCA_U32_SEL,
      TCA_U32_POLICE,
      TCA_U32_ACT,   
      TCA_U32_INDEV,
      TCA_U32_PCNT,
      __TCA_U32_MAX
};

#define TCA_U32_MAX (__TCA_U32_MAX - 1)

00198 struct tc_u32_key
{
      __u32       mask;
      __u32       val;
      int         off;
      int         offmask;
};

00206 struct tc_u32_sel
{
      unsigned char           flags;
      unsigned char           offshift;
      unsigned char           nkeys;

      __u16             offmask;
      __u16             off;
      short             offoff;

      short             hoff;
      __u32             hmask;
      struct tc_u32_key keys[0];
};

00221 struct tc_u32_pcnt
{
      __u64 rcnt;
      __u64 rhit;
      __u64 kcnts[0];
};
/* Flags */

#define TC_U32_TERMINAL       1
#define TC_U32_OFFSET         2
#define TC_U32_VAROFFSET      4
#define TC_U32_EAT            8

#define TC_U32_MAXDEPTH 8


/* RSVP filter */

enum
{
      TCA_RSVP_UNSPEC,
      TCA_RSVP_CLASSID,
      TCA_RSVP_DST,
      TCA_RSVP_SRC,
      TCA_RSVP_PINFO,
      TCA_RSVP_POLICE,
      __TCA_RSVP_MAX
};

#define TCA_RSVP_MAX (__TCA_RSVP_MAX - 1 )

00252 struct tc_rsvp_gpi
{
      __u32 key;
      __u32 mask;
      int   offset;
};

00259 struct tc_rsvp_pinfo
{
      struct tc_rsvp_gpi dpi;
      struct tc_rsvp_gpi spi;
      __u8  protocol;
      __u8  tunnelid;
      __u8  tunnelhdr;
};

/* ROUTE filter */

enum
{
      TCA_ROUTE4_UNSPEC,
      TCA_ROUTE4_CLASSID,
      TCA_ROUTE4_TO,
      TCA_ROUTE4_FROM,
      TCA_ROUTE4_IIF,
      TCA_ROUTE4_POLICE,
      __TCA_ROUTE4_MAX
};

#define TCA_ROUTE4_MAX (__TCA_ROUTE4_MAX - 1)


/* FW filter */

enum
{
      TCA_FW_UNSPEC,
      TCA_FW_CLASSID,
      TCA_FW_POLICE,
      TCA_FW_INDEV, /*  used by CONFIG_NET_CLS_IND */
      TCA_FW_ACT, /* used by CONFIG_NET_CLS_ACT */
      __TCA_FW_MAX
};

#define TCA_FW_MAX (__TCA_FW_MAX - 1)

/* TC index filter */

enum
{
      TCA_TCINDEX_UNSPEC,
      TCA_TCINDEX_HASH,
      TCA_TCINDEX_MASK,
      TCA_TCINDEX_SHIFT,
      TCA_TCINDEX_FALL_THROUGH,
      TCA_TCINDEX_CLASSID,
      TCA_TCINDEX_POLICE,
      __TCA_TCINDEX_MAX
};

#define TCA_TCINDEX_MAX     (__TCA_TCINDEX_MAX - 1)

#endif

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