lapb_in.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:17k
- /*
- * LAPB release 002
- *
- * This code REQUIRES 2.1.15 or higher/ NET3.038
- *
- * This module:
- * This module is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * History
- * LAPB 001 Jonathan Naulor Started Coding
- * LAPB 002 Jonathan Naylor New timer architecture.
- * 2000-10-29 Henner Eisen lapb_data_indication() return status.
- */
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <linux/inet.h>
- #include <linux/netdevice.h>
- #include <linux/skbuff.h>
- #include <net/sock.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <linux/fcntl.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <net/lapb.h>
- /*
- * State machine for state 0, Disconnected State.
- * The handling of the timer(s) is in file lapb_timer.c.
- */
- static void lapb_state0_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
- {
- switch (frame->type) {
- case LAPB_SABM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 RX SABM(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S0 -> S3n", lapb->token);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_3;
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_connect_indication(lapb, LAPB_OK);
- }
- break;
- case LAPB_SABME:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 RX SABME(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S0 -> S3n", lapb->token);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_3;
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_connect_indication(lapb, LAPB_OK);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- }
- break;
- case LAPB_DISC:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S0 RX DISC(%d)n", lapb->token, frame->pf);
- printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- break;
- default:
- break;
- }
- kfree_skb(skb);
- }
- /*
- * State machine for state 1, Awaiting Connection State.
- * The handling of the timer(s) is in file lapb_timer.c.
- */
- static void lapb_state1_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
- {
- switch (frame->type) {
- case LAPB_SABM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 RX SABM(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- }
- break;
- case LAPB_SABME:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 RX SABME(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- }
- break;
- case LAPB_DISC:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 RX DISC(%d)n", lapb->token, frame->pf);
- printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- break;
- case LAPB_UA:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 RX UA(%d)n", lapb->token, frame->pf);
- #endif
- if (frame->pf) {
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S1 -> S3n", lapb->token);
- #endif
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_3;
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_connect_confirmation(lapb, LAPB_OK);
- }
- break;
- case LAPB_DM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S1 RX DM(%d)n", lapb->token, frame->pf);
- #endif
- if (frame->pf) {
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S1 -> S0n", lapb->token);
- #endif
- lapb_clear_queues(lapb);
- lapb->state = LAPB_STATE_0;
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb_disconnect_indication(lapb, LAPB_REFUSED);
- }
- break;
- default:
- break;
- }
- kfree_skb(skb);
- }
- /*
- * State machine for state 2, Awaiting Release State.
- * The handling of the timer(s) is in file lapb_timer.c
- */
- static void lapb_state2_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
- {
- switch (frame->type) {
- case LAPB_SABM:
- case LAPB_SABME:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S2 RX {SABM,SABME}(%d)n", lapb->token, frame->pf);
- printk(KERN_DEBUG "lapb: (%p) S2 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- break;
- case LAPB_DISC:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S2 RX DISC(%d)n", lapb->token, frame->pf);
- printk(KERN_DEBUG "lapb: (%p) S2 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- break;
- case LAPB_UA:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S2 RX UA(%d)n", lapb->token, frame->pf);
- #endif
- if (frame->pf) {
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S2 -> S0n", lapb->token);
- #endif
- lapb->state = LAPB_STATE_0;
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb_disconnect_confirmation(lapb, LAPB_OK);
- }
- break;
- case LAPB_DM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)n", lapb->token, frame->pf);
- #endif
- if (frame->pf) {
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S2 -> S0n", lapb->token);
- #endif
- lapb->state = LAPB_STATE_0;
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED);
- }
- break;
- case LAPB_I:
- case LAPB_REJ:
- case LAPB_RNR:
- case LAPB_RR:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S2 RX {I,REJ,RNR,RR}(%d)n", lapb->token, frame->pf);
- printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)n", lapb->token, frame->pf);
- #endif
- if (frame->pf) lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- break;
-
- default:
- break;
- }
- kfree_skb(skb);
- }
- /*
- * State machine for state 3, Connected State.
- * The handling of the timer(s) is in file lapb_timer.c
- */
- static void lapb_state3_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
- {
- int queued = 0;
- int modulus;
-
- modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
- switch (frame->type) {
- case LAPB_SABM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX SABM(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_requeue_frames(lapb);
- }
- break;
- case LAPB_SABME:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX SABME(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_requeue_frames(lapb);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- }
- break;
- case LAPB_DISC:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX DISC(%d)n", lapb->token, frame->pf);
- #endif
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S0n", lapb->token);
- #endif
- lapb_clear_queues(lapb);
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_0;
- lapb_disconnect_indication(lapb, LAPB_OK);
- break;
- case LAPB_DM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX DM(%d)n", lapb->token, frame->pf);
- #endif
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S0n", lapb->token);
- #endif
- lapb_clear_queues(lapb);
- lapb->state = LAPB_STATE_0;
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED);
- break;
- case LAPB_RNR:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX RNR(%d) R%dn", lapb->token, frame->pf, frame->nr);
- #endif
- lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION;
- lapb_check_need_response(lapb, frame->cr, frame->pf);
- if (lapb_validate_nr(lapb, frame->nr)) {
- lapb_check_iframes_acked(lapb, frame->nr);
- } else {
- lapb->frmr_data = *frame;
- lapb->frmr_type = LAPB_FRMR_Z;
- lapb_transmit_frmr(lapb);
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S4n", lapb->token);
- #endif
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_4;
- lapb->n2count = 0;
- }
- break;
- case LAPB_RR:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX RR(%d) R%dn", lapb->token, frame->pf, frame->nr);
- #endif
- lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION;
- lapb_check_need_response(lapb, frame->cr, frame->pf);
- if (lapb_validate_nr(lapb, frame->nr)) {
- lapb_check_iframes_acked(lapb, frame->nr);
- } else {
- lapb->frmr_data = *frame;
- lapb->frmr_type = LAPB_FRMR_Z;
- lapb_transmit_frmr(lapb);
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S4n", lapb->token);
- #endif
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_4;
- lapb->n2count = 0;
- }
- break;
- case LAPB_REJ:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX REJ(%d) R%dn", lapb->token, frame->pf, frame->nr);
- #endif
- lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION;
- lapb_check_need_response(lapb, frame->cr, frame->pf);
- if (lapb_validate_nr(lapb, frame->nr)) {
- lapb_frames_acked(lapb, frame->nr);
- lapb_stop_t1timer(lapb);
- lapb->n2count = 0;
- lapb_requeue_frames(lapb);
- } else {
- lapb->frmr_data = *frame;
- lapb->frmr_type = LAPB_FRMR_Z;
- lapb_transmit_frmr(lapb);
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S4n", lapb->token);
- #endif
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_4;
- lapb->n2count = 0;
- }
- break;
- case LAPB_I:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX I(%d) S%d R%dn", lapb->token, frame->pf, frame->ns, frame->nr);
- #endif
- if (!lapb_validate_nr(lapb, frame->nr)) {
- lapb->frmr_data = *frame;
- lapb->frmr_type = LAPB_FRMR_Z;
- lapb_transmit_frmr(lapb);
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S4n", lapb->token);
- #endif
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_4;
- lapb->n2count = 0;
- break;
- }
- if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) {
- lapb_frames_acked(lapb, frame->nr);
- } else {
- lapb_check_iframes_acked(lapb, frame->nr);
- }
- if (frame->ns == lapb->vr) {
- int cn;
- cn = lapb_data_indication(lapb, skb);
- queued = 1;
- /*
- * If upper layer has dropped the frame, we
- * basically ignore any further protocol
- * processing. This will cause the peer
- * to re-transmit the frame later like
- * a frame lost on the wire.
- */
- if(cn == NET_RX_DROP){
- printk(KERN_DEBUG "LAPB: rx congestionn");
- break;
- }
- lapb->vr = (lapb->vr + 1) % modulus;
- lapb->condition &= ~LAPB_REJECT_CONDITION;
- if (frame->pf) {
- lapb_enquiry_response(lapb);
- } else {
- if (!(lapb->condition & LAPB_ACK_PENDING_CONDITION)) {
- lapb->condition |= LAPB_ACK_PENDING_CONDITION;
- lapb_start_t2timer(lapb);
- }
- }
- } else {
- if (lapb->condition & LAPB_REJECT_CONDITION) {
- if (frame->pf)
- lapb_enquiry_response(lapb);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 TX REJ(%d) R%dn", lapb->token, frame->pf, lapb->vr);
- #endif
- lapb->condition |= LAPB_REJECT_CONDITION;
- lapb_send_control(lapb, LAPB_REJ, frame->pf, LAPB_RESPONSE);
- lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
- }
- }
- break;
- case LAPB_FRMR:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX FRMR(%d) %02X %02X %02X %02X %02Xn", lapb->token, frame->pf, skb->data[0], skb->data[1], skb->data[2], skb->data[3], skb->data[4]);
- #endif
- lapb_establish_data_link(lapb);
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S1n", lapb->token);
- #endif
- lapb_requeue_frames(lapb);
- lapb->state = LAPB_STATE_1;
- break;
- case LAPB_ILLEGAL:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S3 RX ILLEGAL(%d)n", lapb->token, frame->pf);
- #endif
- lapb->frmr_data = *frame;
- lapb->frmr_type = LAPB_FRMR_W;
- lapb_transmit_frmr(lapb);
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S3 -> S4n", lapb->token);
- #endif
- lapb_start_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_4;
- lapb->n2count = 0;
- break;
- default:
- break;
- }
- if (!queued)
- kfree_skb(skb);
- }
- /*
- * State machine for state 4, Frame Reject State.
- * The handling of the timer(s) is in file lapb_timer.c.
- */
- static void lapb_state4_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
- {
- switch (frame->type) {
- case LAPB_SABM:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S4 RX SABM(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S4 -> S3n", lapb->token);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_3;
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_connect_indication(lapb, LAPB_OK);
- }
- break;
- case LAPB_SABME:
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S4 RX SABME(%d)n", lapb->token, frame->pf);
- #endif
- if (lapb->mode & LAPB_EXTENDED) {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)n", lapb->token, frame->pf);
- #endif
- #if LAPB_DEBUG > 0
- printk(KERN_DEBUG "lapb: (%p) S4 -> S3n", lapb->token);
- #endif
- lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
- lapb_stop_t1timer(lapb);
- lapb_stop_t2timer(lapb);
- lapb->state = LAPB_STATE_3;
- lapb->condition = 0x00;
- lapb->n2count = 0;
- lapb->vs = 0;
- lapb->vr = 0;
- lapb->va = 0;
- lapb_connect_indication(lapb, LAPB_OK);
- } else {
- #if LAPB_DEBUG > 1
- printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)n", lapb->token, frame->pf);
- #endif
- lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
- }
- break;
- default:
- break;
- }
- kfree_skb(skb);
- }
- /*
- * Process an incoming LAPB frame
- */
- void lapb_data_input(lapb_cb *lapb, struct sk_buff *skb)
- {
- struct lapb_frame frame;
- lapb_decode(lapb, skb, &frame);
- switch (lapb->state) {
- case LAPB_STATE_0:
- lapb_state0_machine(lapb, skb, &frame);
- break;
- case LAPB_STATE_1:
- lapb_state1_machine(lapb, skb, &frame);
- break;
- case LAPB_STATE_2:
- lapb_state2_machine(lapb, skb, &frame);
- break;
- case LAPB_STATE_3:
- lapb_state3_machine(lapb, skb, &frame);
- break;
- case LAPB_STATE_4:
- lapb_state4_machine(lapb, skb, &frame);
- break;
- }
- lapb_kick(lapb);
- }