include/linux/divert.h

   1 /*
   2  * Frame Diversion, Benoit Locher <Benoit.Locher@skf.com>
   3  *
   4  * Changes:
   5  *              06/09/2000      BL:     initial version
   6  *
   7  */
   8
   9 #ifndef _LINUX_DIVERT_H
  10 #define _LINUX_DIVERT_H
  11
  12 #include <asm/types.h>
  13
  14 #define MAX_DIVERT_PORTS        8       /* Max number of ports to divert (tcp, udp) */
  15
  16 /* Divertable protocols */
  17 #define DIVERT_PROTO_NONE       0x0000
  18 #define DIVERT_PROTO_IP         0x0001
  19 #define DIVERT_PROTO_ICMP       0x0002
  20 #define DIVERT_PROTO_TCP        0x0004
  21 #define DIVERT_PROTO_UDP        0x0008
  22
  23 /*
  24  *      This is an Ethernet Frame Diverter option block
  25  */
  26 struct divert_blk
  27 {
  28         int             divert;  /* are we active */
  29         unsigned int protos;    /* protocols */
  30         __u16           tcp_dst[MAX_DIVERT_PORTS]; /* specific tcp dst ports to divert */
  31         __u16           tcp_src[MAX_DIVERT_PORTS]; /* specific tcp src ports to divert */
  32         __u16           udp_dst[MAX_DIVERT_PORTS]; /* specific udp dst ports to divert */
  33         __u16           udp_src[MAX_DIVERT_PORTS]; /* specific udp src ports to divert */
  34 };
  35
  36 /*
  37  * Diversion control block, for configuration with the userspace tool
  38  * divert
  39  */
  40
  41 typedef union _divert_cf_arg
  42 {
  43         __s16           int16;
  44         __u16           uint16;
  45         __s32           int32;
  46         __u32           uint32;
  47         __s64           int64;
  48         __u64           uint64;
  49         void    __user *ptr;
  50 } divert_cf_arg;
  51
  52
  53 struct divert_cf
  54 {
  55         int     cmd;                            /* Command */
  56         divert_cf_arg   arg1,
  57                                         arg2,
  58                                         arg3;
  59         int     dev_index;      /* device index (eth0=0, etc...) */
  60 };
  61
  62
  63 /* Diversion commands */
  64 #define DIVCMD_DIVERT                   1 /* ENABLE/DISABLE diversion */
  65 #define DIVCMD_IP                               2 /* ENABLE/DISABLE whold IP diversion */
  66 #define DIVCMD_TCP                              3 /* ENABLE/DISABLE whold TCP diversion */
  67 #define DIVCMD_TCPDST                   4 /* ADD/REMOVE TCP DST port for diversion */
  68 #define DIVCMD_TCPSRC                   5 /* ADD/REMOVE TCP SRC port for diversion */
  69 #define DIVCMD_UDP                              6 /* ENABLE/DISABLE whole UDP diversion */
  70 #define DIVCMD_UDPDST                   7 /* ADD/REMOVE UDP DST port for diversion */
  71 #define DIVCMD_UDPSRC                   8 /* ADD/REMOVE UDP SRC port for diversion */
  72 #define DIVCMD_ICMP                             9 /* ENABLE/DISABLE whole ICMP diversion */
  73 #define DIVCMD_GETSTATUS                10 /* GET the status of the diverter */
  74 #define DIVCMD_RESET                    11 /* Reset the diverter on the specified dev */
  75 #define DIVCMD_GETVERSION               12 /* Retrieve the diverter code version (char[32]) */
  76
  77 /* General syntax of the commands:
  78  *
  79  * DIVCMD_xxxxxx(arg1, arg2, arg3, dev_index)
  80  *
  81  * SIOCSIFDIVERT:
  82  *   DIVCMD_DIVERT(DIVARG1_ENABLE|DIVARG1_DISABLE, , ,ifindex)
  83  *   DIVCMD_IP(DIVARG1_ENABLE|DIVARG1_DISABLE, , , ifindex)
  84  *   DIVCMD_TCP(DIVARG1_ENABLE|DIVARG1_DISABLE, , , ifindex)
  85  *   DIVCMD_TCPDST(DIVARG1_ADD|DIVARG1_REMOVE, port, , ifindex)
  86  *   DIVCMD_TCPSRC(DIVARG1_ADD|DIVARG1_REMOVE, port, , ifindex)
  87  *   DIVCMD_UDP(DIVARG1_ENABLE|DIVARG1_DISABLE, , , ifindex)
  88  *   DIVCMD_UDPDST(DIVARG1_ADD|DIVARG1_REMOVE, port, , ifindex)
  89  *   DIVCMD_UDPSRC(DIVARG1_ADD|DIVARG1_REMOVE, port, , ifindex)
  90  *   DIVCMD_ICMP(DIVARG1_ENABLE|DIVARG1_DISABLE, , , ifindex)
  91  *   DIVCMD_RESET(, , , ifindex)
  92  *
  93  * SIOGIFDIVERT:
  94  *   DIVCMD_GETSTATUS(divert_blk, , , ifindex)
  95  *   DIVCMD_GETVERSION(string[3])
  96  */
  97
  98
  99 /* Possible values for arg1 */
 100 #define DIVARG1_ENABLE                  0 /* ENABLE something */
 101 #define DIVARG1_DISABLE                 1 /* DISABLE something */
 102 #define DIVARG1_ADD                             2 /* ADD something */
 103 #define DIVARG1_REMOVE                  3 /* REMOVE something */
 104
 105
 106 #ifdef __KERNEL__
 107
 108 /* diverter functions */
 109 #include <linux/skbuff.h>
 110
 111 #ifdef CONFIG_NET_DIVERT
 112 #include <linux/netdevice.h>
 113
 114 int alloc_divert_blk(struct net_device *);
 115 void free_divert_blk(struct net_device *);
 116 int divert_ioctl(unsigned int cmd, struct divert_cf __user *arg);
 117 void divert_frame(struct sk_buff *skb);
 118 static inline void handle_diverter(struct sk_buff *skb)
 119 {
 120         /* if diversion is supported on device, then divert */
 121         if (skb->dev->divert && skb->dev->divert->divert)
 122                 divert_frame(skb);
 123 }
 124
 125 #else
 126 # define alloc_divert_blk(dev)          (0)
 127 # define free_divert_blk(dev)           do {} while (0)
 128 # define divert_ioctl(cmd, arg)         (-ENOPKG)
 129 # define handle_diverter(skb)           do {} while (0)
 130 #endif
 131 #endif
 132 #endif  /* _LINUX_DIVERT_H */