1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LAPB_H 3 #define _LAPB_H 4 #include <linux/lapb.h> 5 #include <linux/refcount.h> 6 7 #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */ 8 9 #define LAPB_ACK_PENDING_CONDITION 0x01 10 #define LAPB_REJECT_CONDITION 0x02 11 #define LAPB_PEER_RX_BUSY_CONDITION 0x04 12 13 /* Control field templates */ 14 #define LAPB_I 0x00 /* Information frames */ 15 #define LAPB_S 0x01 /* Supervisory frames */ 16 #define LAPB_U 0x03 /* Unnumbered frames */ 17 18 #define LAPB_RR 0x01 /* Receiver ready */ 19 #define LAPB_RNR 0x05 /* Receiver not ready */ 20 #define LAPB_REJ 0x09 /* Reject */ 21 22 #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */ 23 #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */ 24 #define LAPB_DISC 0x43 /* Disconnect */ 25 #define LAPB_DM 0x0F /* Disconnected mode */ 26 #define LAPB_UA 0x63 /* Unnumbered acknowledge */ 27 #define LAPB_FRMR 0x87 /* Frame reject */ 28 29 #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */ 30 31 #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */ 32 #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */ 33 34 #define LAPB_FRMR_W 0x01 /* Control field invalid */ 35 #define LAPB_FRMR_X 0x02 /* I field invalid */ 36 #define LAPB_FRMR_Y 0x04 /* I field too long */ 37 #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */ 38 39 #define LAPB_POLLOFF 0 40 #define LAPB_POLLON 1 41 42 /* LAPB C-bit */ 43 #define LAPB_COMMAND 1 44 #define LAPB_RESPONSE 2 45 46 #define LAPB_ADDR_A 0x03 47 #define LAPB_ADDR_B 0x01 48 #define LAPB_ADDR_C 0x0F 49 #define LAPB_ADDR_D 0x07 50 51 /* Define Link State constants. */ 52 enum { 53 LAPB_STATE_0, /* Disconnected State */ 54 LAPB_STATE_1, /* Awaiting Connection State */ 55 LAPB_STATE_2, /* Awaiting Disconnection State */ 56 LAPB_STATE_3, /* Data Transfer State */ 57 LAPB_STATE_4 /* Frame Reject State */ 58 }; 59 60 #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE) 61 #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */ 62 #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */ 63 #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */ 64 #define LAPB_DEFAULT_N2 20 /* N2=20 */ 65 66 #define LAPB_SMODULUS 8 67 #define LAPB_EMODULUS 128 68 69 /* 70 * Information about the current frame. 71 */ 72 struct lapb_frame { 73 unsigned short type; /* Parsed type */ 74 unsigned short nr, ns; /* N(R), N(S) */ 75 unsigned char cr; /* Command/Response */ 76 unsigned char pf; /* Poll/Final */ 77 unsigned char control[2]; /* Original control data*/ 78 }; 79 80 /* 81 * The per LAPB connection control structure. 82 */ 83 struct lapb_cb { 84 struct list_head node; 85 struct net_device *dev; 86 87 /* Link status fields */ 88 unsigned int mode; 89 unsigned char state; 90 unsigned short vs, vr, va; 91 unsigned char condition; 92 unsigned short n2, n2count; 93 unsigned short t1, t2; 94 struct timer_list t1timer, t2timer; 95 bool t1timer_stop, t2timer_stop; 96 97 /* Internal control information */ 98 struct sk_buff_head write_queue; 99 struct sk_buff_head ack_queue; 100 unsigned char window; 101 const struct lapb_register_struct *callbacks; 102 103 /* FRMR control information */ 104 struct lapb_frame frmr_data; 105 unsigned char frmr_type; 106 107 spinlock_t lock; 108 refcount_t refcnt; 109 }; 110 111 /* lapb_iface.c */ 112 void lapb_connect_confirmation(struct lapb_cb *lapb, int); 113 void lapb_connect_indication(struct lapb_cb *lapb, int); 114 void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); 115 void lapb_disconnect_indication(struct lapb_cb *lapb, int); 116 int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); 117 int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); 118 119 /* lapb_in.c */ 120 void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); 121 122 /* lapb_out.c */ 123 void lapb_kick(struct lapb_cb *lapb); 124 void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); 125 void lapb_establish_data_link(struct lapb_cb *lapb); 126 void lapb_enquiry_response(struct lapb_cb *lapb); 127 void lapb_timeout_response(struct lapb_cb *lapb); 128 void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); 129 void lapb_check_need_response(struct lapb_cb *lapb, int, int); 130 131 /* lapb_subr.c */ 132 void lapb_clear_queues(struct lapb_cb *lapb); 133 void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); 134 void lapb_requeue_frames(struct lapb_cb *lapb); 135 int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); 136 int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); 137 void lapb_send_control(struct lapb_cb *lapb, int, int, int); 138 void lapb_transmit_frmr(struct lapb_cb *lapb); 139 140 /* lapb_timer.c */ 141 void lapb_start_t1timer(struct lapb_cb *lapb); 142 void lapb_start_t2timer(struct lapb_cb *lapb); 143 void lapb_stop_t1timer(struct lapb_cb *lapb); 144 void lapb_stop_t2timer(struct lapb_cb *lapb); 145 int lapb_t1timer_running(struct lapb_cb *lapb); 146 147 /* 148 * Debug levels. 149 * 0 = Off 150 * 1 = State Changes 151 * 2 = Packets I/O and State Changes 152 * 3 = Hex dumps, Packets I/O and State Changes. 153 */ 154 #define LAPB_DEBUG 0 155 156 #define lapb_dbg(level, fmt, ...) \ 157 do { \ 158 if (level < LAPB_DEBUG) \ 159 pr_debug(fmt, ##__VA_ARGS__); \ 160 } while (0) 161 162 #endif 163