1 #ifndef _LAPB_H 2 #define _LAPB_H 3 #include <linux/lapb.h> 4 #include <linux/refcount.h> 5 6 #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */ 7 8 #define LAPB_ACK_PENDING_CONDITION 0x01 9 #define LAPB_REJECT_CONDITION 0x02 10 #define LAPB_PEER_RX_BUSY_CONDITION 0x04 11 12 /* Control field templates */ 13 #define LAPB_I 0x00 /* Information frames */ 14 #define LAPB_S 0x01 /* Supervisory frames */ 15 #define LAPB_U 0x03 /* Unnumbered frames */ 16 17 #define LAPB_RR 0x01 /* Receiver ready */ 18 #define LAPB_RNR 0x05 /* Receiver not ready */ 19 #define LAPB_REJ 0x09 /* Reject */ 20 21 #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */ 22 #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */ 23 #define LAPB_DISC 0x43 /* Disconnect */ 24 #define LAPB_DM 0x0F /* Disconnected mode */ 25 #define LAPB_UA 0x63 /* Unnumbered acknowledge */ 26 #define LAPB_FRMR 0x87 /* Frame reject */ 27 28 #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */ 29 30 #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */ 31 #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */ 32 33 #define LAPB_FRMR_W 0x01 /* Control field invalid */ 34 #define LAPB_FRMR_X 0x02 /* I field invalid */ 35 #define LAPB_FRMR_Y 0x04 /* I field too long */ 36 #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */ 37 38 #define LAPB_POLLOFF 0 39 #define LAPB_POLLON 1 40 41 /* LAPB C-bit */ 42 #define LAPB_COMMAND 1 43 #define LAPB_RESPONSE 2 44 45 #define LAPB_ADDR_A 0x03 46 #define LAPB_ADDR_B 0x01 47 #define LAPB_ADDR_C 0x0F 48 #define LAPB_ADDR_D 0x07 49 50 /* Define Link State constants. */ 51 enum { 52 LAPB_STATE_0, /* Disconnected State */ 53 LAPB_STATE_1, /* Awaiting Connection State */ 54 LAPB_STATE_2, /* Awaiting Disconnection State */ 55 LAPB_STATE_3, /* Data Transfer State */ 56 LAPB_STATE_4 /* Frame Reject State */ 57 }; 58 59 #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE) 60 #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */ 61 #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */ 62 #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */ 63 #define LAPB_DEFAULT_N2 20 /* N2=20 */ 64 65 #define LAPB_SMODULUS 8 66 #define LAPB_EMODULUS 128 67 68 /* 69 * Information about the current frame. 70 */ 71 struct lapb_frame { 72 unsigned short type; /* Parsed type */ 73 unsigned short nr, ns; /* N(R), N(S) */ 74 unsigned char cr; /* Command/Response */ 75 unsigned char pf; /* Poll/Final */ 76 unsigned char control[2]; /* Original control data*/ 77 }; 78 79 /* 80 * The per LAPB connection control structure. 81 */ 82 struct lapb_cb { 83 struct list_head node; 84 struct net_device *dev; 85 86 /* Link status fields */ 87 unsigned int mode; 88 unsigned char state; 89 unsigned short vs, vr, va; 90 unsigned char condition; 91 unsigned short n2, n2count; 92 unsigned short t1, t2; 93 struct timer_list t1timer, t2timer; 94 95 /* Internal control information */ 96 struct sk_buff_head write_queue; 97 struct sk_buff_head ack_queue; 98 unsigned char window; 99 const struct lapb_register_struct *callbacks; 100 101 /* FRMR control information */ 102 struct lapb_frame frmr_data; 103 unsigned char frmr_type; 104 105 refcount_t refcnt; 106 }; 107 108 /* lapb_iface.c */ 109 void lapb_connect_confirmation(struct lapb_cb *lapb, int); 110 void lapb_connect_indication(struct lapb_cb *lapb, int); 111 void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); 112 void lapb_disconnect_indication(struct lapb_cb *lapb, int); 113 int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); 114 int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); 115 116 /* lapb_in.c */ 117 void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); 118 119 /* lapb_out.c */ 120 void lapb_kick(struct lapb_cb *lapb); 121 void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); 122 void lapb_establish_data_link(struct lapb_cb *lapb); 123 void lapb_enquiry_response(struct lapb_cb *lapb); 124 void lapb_timeout_response(struct lapb_cb *lapb); 125 void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); 126 void lapb_check_need_response(struct lapb_cb *lapb, int, int); 127 128 /* lapb_subr.c */ 129 void lapb_clear_queues(struct lapb_cb *lapb); 130 void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); 131 void lapb_requeue_frames(struct lapb_cb *lapb); 132 int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); 133 int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); 134 void lapb_send_control(struct lapb_cb *lapb, int, int, int); 135 void lapb_transmit_frmr(struct lapb_cb *lapb); 136 137 /* lapb_timer.c */ 138 void lapb_start_t1timer(struct lapb_cb *lapb); 139 void lapb_start_t2timer(struct lapb_cb *lapb); 140 void lapb_stop_t1timer(struct lapb_cb *lapb); 141 void lapb_stop_t2timer(struct lapb_cb *lapb); 142 int lapb_t1timer_running(struct lapb_cb *lapb); 143 144 /* 145 * Debug levels. 146 * 0 = Off 147 * 1 = State Changes 148 * 2 = Packets I/O and State Changes 149 * 3 = Hex dumps, Packets I/O and State Changes. 150 */ 151 #define LAPB_DEBUG 0 152 153 #define lapb_dbg(level, fmt, ...) \ 154 do { \ 155 if (level < LAPB_DEBUG) \ 156 pr_debug(fmt, ##__VA_ARGS__); \ 157 } while (0) 158 159 #endif 160