/********************************************************************* * * Filename: irlap_event.c * Version: 0.8 * Description: IrLAP state machine implementation * Status: Experimental. * Author: Dag Brattli * Created at: Sat Aug 16 00:59:29 1997 * Modified at: Sun Oct 10 11:14:22 1999 * Modified by: Dag Brattli * * Copyright (c) 1998-1999 Dag Brattli , * Thomas Davis * All Rights Reserved. * * This program 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. * * Neither Dag Brattli nor University of Tromsų admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. * ********************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #if CONFIG_IRDA_FAST_RR int sysctl_fast_poll_increase = 50; #endif static int irlap_state_ndm (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_query (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_reply (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_conn (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_setup (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_xmit_p (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_pclose (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_nrm_p (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_reset (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_nrm_s (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_xmit_s (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_sclose (struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info); static int irlap_state_reset_check(struct irlap_cb *, IRLAP_EVENT event, struct sk_buff *, struct irlap_info *); static const char *irlap_event[] = { "DISCOVERY_REQUEST", "CONNECT_REQUEST", "CONNECT_RESPONSE", "DISCONNECT_REQUEST", "DATA_REQUEST", "RESET_REQUEST", "RESET_RESPONSE", "SEND_I_CMD", "RECV_DISCOVERY_XID_CMD", "RECV_DISCOVERY_XID_RSP", "RECV_SNRM_CMD", "RECV_TEST_CMD", "RECV_TEST_RSP", "RECV_UA_RSP", "RECV_DM_RSP", "RECV_I_CMD", "RECV_I_RSP", "RECV_UI_FRAME", "RECV_FRMR_RSP", "RECV_RR_CMD", "RECV_RR_RSP", "RECV_RNR_FRAME", "RECV_DISC_FRAME", "SLOT_TIMER_EXPIRED", "QUERY_TIMER_EXPIRED", "FINAL_TIMER_EXPIRED", "POLL_TIMER_EXPIRED", "DISCOVERY_TIMER_EXPIRED", "WD_TIMER_EXPIRED", "BACKOFF_TIMER_EXPIRED", }; const char *irlap_state[] = { "LAP_NDM", "LAP_QUERY", "LAP_REPLY", "LAP_CONN", "LAP_SETUP", "LAP_OFFLINE", "LAP_XMIT_P", "LAP_PCLOSE", "LAP_NRM_P", "LAP_RESET_WAIT", "LAP_RESET", "LAP_NRM_S", "LAP_XMIT_S", "LAP_SCLOSE", "LAP_RESET_CHECK", }; static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) = { irlap_state_ndm, irlap_state_query, irlap_state_reply, irlap_state_conn, irlap_state_setup, irlap_state_offline, irlap_state_xmit_p, irlap_state_pclose, irlap_state_nrm_p, irlap_state_reset_wait, irlap_state_reset, irlap_state_nrm_s, irlap_state_xmit_s, irlap_state_sclose, irlap_state_reset_check, }; /* * Function irda_poll_timer_expired (data) * * Poll timer has expired. Normally we must now send a RR frame to the * remote device */ static void irlap_poll_timer_expired(void *data) { struct irlap_cb *self = (struct irlap_cb *) data; ASSERT(self != NULL, return;); ASSERT(self->magic == LAP_MAGIC, return;); irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); } void irlap_start_poll_timer(struct irlap_cb *self, int timeout) { ASSERT(self != NULL, return;); ASSERT(self->magic == LAP_MAGIC, return;); #ifdef CONFIG_IRDA_FAST_RR /* * Send out the RR frames faster if our own transmit queue is empty, or * if the peer is busy. The effect is a much faster conversation */ if ((skb_queue_len(&self->tx_list) == 0) || (self->remote_busy)) { if (self->fast_RR == TRUE) { /* * Assert that the fast poll timer has not reached the * normal poll timer yet */ if (self->fast_RR_timeout < timeout) { /* * FIXME: this should be a more configurable * function */ self->fast_RR_timeout += (sysctl_fast_poll_increase * HZ/1000); /* Use this fast(er) timeout instead */ timeout = self->fast_RR_timeout; } } else { self->fast_RR = TRUE; /* Start with just 0 ms */ self->fast_RR_timeout = 0; timeout = 0; } } else self->fast_RR = FALSE; IRDA_DEBUG(4, __FUNCTION__ "(), Timeout=%d\n", timeout); #endif if (timeout == 0) irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); else irda_start_timer(&self->poll_timer, timeout, self, irlap_poll_timer_expired); } /* * Function irlap_do_event (event, skb, info) * * Rushes through the state machine without any delay. If state == XMIT * then send queued data frames. */ void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret; if (!self || self->magic != LAP_MAGIC) return; IRDA_DEBUG(4, __FUNCTION__ "(), event = %s, state = %s\n", irlap_event[event], irlap_state[self->state]); ret = (*state[self->state])(self, event, skb, info); /* * Check if there are any pending events that needs to be executed */ switch (self->state) { case LAP_XMIT_P: /* FALLTHROUGH */ case LAP_XMIT_S: /* * Check if there are any queued data frames, and do not * try to disconnect link if we send any data frames, since * that will change the state away form XMIT */ if (skb_queue_len(&self->tx_list)) { /* Try to send away all queued data frames */ while ((skb = skb_dequeue(&self->tx_list)) != NULL) { ret = (*state[self->state])(self, SEND_I_CMD, skb, NULL); if (ret == -EPROTO) break; /* Try again later! */ } } else if (self->disconnect_pending) { self->disconnect_pending = FALSE; ret = (*state[self->state])(self, DISCONNECT_REQUEST, NULL, NULL); } break; case LAP_NDM: /* Check if we should try to connect */ if ((self->connect_pending) && !self->media_busy) { self->connect_pending = FALSE; ret = (*state[self->state])(self, CONNECT_REQUEST, NULL, NULL); } break; /* case LAP_CONN: */ /* case LAP_RESET_WAIT: */ /* case LAP_RESET_CHECK: */ default: break; } } /* * Function irlap_next_state (self, state) * * Switches state and provides debug information * */ void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state) { if (!self || self->magic != LAP_MAGIC) return; IRDA_DEBUG(4, "next LAP state = %s\n", irlap_state[ state]); self->state = state; /* * If we are swithing away from a XMIT state then we are allowed to * transmit a maximum number of bytes again when we enter the XMIT * state again. Since its possible to "switch" from XMIT to XMIT, * we cannot do this when swithing into the XMIT state :-) */ if ((state != LAP_XMIT_P) && (state != LAP_XMIT_S)) self->bytes_left = self->window_bytes; } /* * Function irlap_state_ndm (event, skb, frame) * * NDM (Normal Disconnected Mode) state * */ static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { discovery_t *discovery_rsp; int ret = 0; ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case CONNECT_REQUEST: ASSERT(self->netdev != NULL, return -1;); if (self->media_busy) { IRDA_DEBUG(0, __FUNCTION__ "(), CONNECT_REQUEST: media busy!\n"); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_MEDIA_BUSY); } else { irlap_send_snrm_frame(self, &self->qos_rx); /* Start Final-bit timer */ irlap_start_final_timer(self, self->final_timeout); self->retry_count = 0; irlap_next_state(self, LAP_SETUP); } break; case RECV_SNRM_CMD: /* Check if the frame contains and I field */ if (info) { self->daddr = info->daddr; self->caddr = info->caddr; irlap_next_state(self, LAP_CONN); irlap_connect_indication(self, skb); } else { IRDA_DEBUG(0, __FUNCTION__ "(), SNRM frame does not contain" " and I field!\n"); dev_kfree_skb(skb); } break; case DISCOVERY_REQUEST: ASSERT(info != NULL, return -1;); if (self->media_busy) { IRDA_DEBUG(0, __FUNCTION__ "(), media busy!\n"); /* irlap->log.condition = MEDIA_BUSY; */ /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); /* This will make IrLMP try again */ irlap_discovery_confirm(self, NULL); return 0; } self->S = info->S; self->s = info->s; irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE, info->discovery); self->s++; irlap_start_slot_timer(self, self->slot_timeout); irlap_next_state(self, LAP_QUERY); break; case RECV_DISCOVERY_XID_CMD: ASSERT(info != NULL, return -1;); /* Assert that this is not the final slot */ if (info->s <= info->S) { /* self->daddr = info->daddr; */ self->slot = irlap_generate_rand_time_slot(info->S, info->s); IRDA_DEBUG(4, "XID_CMD: S=%d, s=%d, slot %d\n", info->S, info->s, self->slot); if (self->slot == info->s) { discovery_rsp = irlmp_get_discovery_response(); discovery_rsp->daddr = info->daddr; irlap_send_discovery_xid_frame(self, info->S, self->slot, FALSE, discovery_rsp); self->frame_sent = TRUE; } else self->frame_sent = FALSE; /* * Remember to multiply the query timeout value with * the number of slots used */ irlap_start_query_timer(self, QUERY_TIMEOUT*info->S); irlap_next_state(self, LAP_REPLY); } dev_kfree_skb(skb); break; case RECV_TEST_CMD: /* Remove test frame header */ skb_pull(skb, sizeof(struct test_frame)); /* * Send response. This skb will not be sent out again, and * will only be used to send out the same info as the cmd */ irlap_send_test_frame(self, info->daddr, skb); dev_kfree_skb(skb); break; case RECV_TEST_RSP: IRDA_DEBUG(0, __FUNCTION__ "() not implemented!\n"); dev_kfree_skb(skb); break; default: IRDA_DEBUG(2, __FUNCTION__ "(), Unknown event %s\n", irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_query (event, skb, info) * * QUERY state * */ static int irlap_state_query(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch(event) { case RECV_DISCOVERY_XID_RSP: ASSERT(info != NULL, return -1;); ASSERT(info->discovery != NULL, return -1;); IRDA_DEBUG(4, __FUNCTION__ "(), daddr=%08x\n", info->discovery->daddr); if (!self->discovery_log) { WARNING(__FUNCTION__ "(), discovery log is gone! " "maybe the discovery timeout has been set to " "short?\n"); break; } hashbin_insert(self->discovery_log, (queue_t *) info->discovery, info->discovery->daddr, NULL); dev_kfree_skb(skb); /* Keep state */ irlap_next_state(self, LAP_QUERY); break; case SLOT_TIMER_EXPIRED: if (self->s < self->S) { irlap_send_discovery_xid_frame(self, self->S, self->s, TRUE, self->discovery_cmd); self->s++; irlap_start_slot_timer(self, self->slot_timeout); /* Keep state */ irlap_next_state(self, LAP_QUERY); } else { /* This is the final slot! */ irlap_send_discovery_xid_frame(self, self->S, 0xff, TRUE, self->discovery_cmd); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); /* * We are now finished with the discovery procedure, * so now we must return the results */ irlap_discovery_confirm(self, self->discovery_log); /* IrLMP should now have taken care of the log */ self->discovery_log = NULL; } break; default: IRDA_DEBUG(2, __FUNCTION__ "(), Unknown event %d, %s\n", event, irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_reply (self, event, skb, info) * * REPLY, we have received a XID discovery frame from a device and we * are waiting for the right time slot to send a response XID frame * */ static int irlap_state_reply(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { discovery_t *discovery_rsp; int ret=0; IRDA_DEBUG(4, __FUNCTION__ "()\n"); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case QUERY_TIMER_EXPIRED: IRDA_DEBUG(2, __FUNCTION__ "(), QUERY_TIMER_EXPIRED <%ld>\n", jiffies); irlap_next_state(self, LAP_NDM); break; case RECV_DISCOVERY_XID_CMD: ASSERT(info != NULL, return -1;); /* * Last frame? */ if (info->s == 0xff) { del_timer(&self->query_timer); /* info->log.condition = REMOTE; */ /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_discovery_indication(self, info->discovery); } else if ((info->s >= self->slot) && (!self->frame_sent)) { discovery_rsp = irlmp_get_discovery_response(); discovery_rsp->daddr = info->daddr; irlap_send_discovery_xid_frame(self, info->S, self->slot, FALSE, discovery_rsp); self->frame_sent = TRUE; irlap_next_state(self, LAP_REPLY); } dev_kfree_skb(skb); break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %d, %s\n", event, irlap_event[event]); if ( skb) dev_kfree_skb( skb); ret = -1; break; } return ret; } /* * Function irlap_state_conn (event, skb, info) * * CONN, we have received a SNRM command and is waiting for the upper * layer to accept or refuse connection * */ static int irlap_state_conn(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(4, __FUNCTION__ "(), event=%s\n", irlap_event[ event]); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case CONNECT_RESPONSE: /* skb_pull(skb, 11); */ skb_pull(skb, sizeof(struct snrm_frame)); ASSERT(self->netdev != NULL, return -1;); irlap_qos_negotiate(self, skb); irlap_initiate_connection_state( self); /* * We are allowed to send two frames! */ irlap_send_ua_response_frame(self, &self->qos_rx); irlap_send_ua_response_frame(self, &self->qos_rx); irlap_apply_connection_parameters(self, &self->qos_tx); /* * The WD-timer could be set to the duration of the P-timer * for this case, but it is recommended to use twice the * value (note 3 IrLAP p. 60). */ irlap_start_wd_timer(self, self->wd_timeout); irlap_next_state( self, LAP_NRM_S); break; case RECV_DISCOVERY_XID_CMD: IRDA_DEBUG( 3, __FUNCTION__ "(), event RECV_DISCOVER_XID_CMD!\n"); irlap_next_state( self, LAP_NDM); break; case DISCONNECT_REQUEST: irlap_send_dm_frame( self); irlap_next_state( self, LAP_CONN); break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %d, %s\n", event, irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_setup (event, skb, frame) * * SETUP state, The local layer has transmitted a SNRM command frame to * a remote peer layer and is awaiting a reply . * */ static int irlap_state_setup(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(4, __FUNCTION__ "()\n"); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch(event) { case FINAL_TIMER_EXPIRED: if (self->retry_count < self->N3) { /* * Perform random backoff, Wait a random number of time units, minimum * duration half the time taken to transmitt a SNRM frame, maximum duration * 1.5 times the time taken to transmit a SNRM frame. So this time should * between 15 msecs and 45 msecs. */ irlap_start_backoff_timer(self, MSECS_TO_JIFFIES(20 + (jiffies % 30))); } else { /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_FOUND_NONE); } break; case BACKOFF_TIMER_EXPIRED: irlap_send_snrm_frame(self, &self->qos_rx); irlap_start_final_timer(self, self->final_timeout); self->retry_count++; break; case RECV_SNRM_CMD: IRDA_DEBUG(4, __FUNCTION__ "(), SNRM battle!\n"); ASSERT(skb != NULL, return 0;); ASSERT(info != NULL, return 0;); /* * The device with the largest device address wins the battle * (both have sent a SNRM command!) */ if (info &&(info->daddr > self->saddr)) { del_timer(&self->final_timer); irlap_initiate_connection_state(self); ASSERT(self->netdev != NULL, return -1;); skb_pull(skb, sizeof(struct snrm_frame)); irlap_qos_negotiate(self, skb); irlap_send_ua_response_frame(self, &self->qos_rx); irlap_apply_connection_parameters(self, &self->qos_tx); irlap_connect_confirm(self, skb); /* * The WD-timer could be set to the duration of the * P-timer for this case, but it is recommended * to use twice the value (note 3 IrLAP p. 60). */ irlap_start_wd_timer(self, self->wd_timeout); irlap_next_state(self, LAP_NRM_S); } else { /* We just ignore the other device! */ dev_kfree_skb(skb); irlap_next_state(self, LAP_SETUP); } break; case RECV_UA_RSP: /* Stop F-timer */ del_timer(&self->final_timer); /* Initiate connection state */ irlap_initiate_connection_state(self); /* Negotiate connection parameters */ ASSERT(skb->len > 10, return -1;); skb_pull(skb, sizeof(struct ua_frame)); ASSERT(self->netdev != NULL, return -1;); irlap_qos_negotiate(self, skb); irlap_apply_connection_parameters(self, &self->qos_tx); self->retry_count = 0; /* This frame will just be sent at the old speed */ /* irlap_send_rr_frame( self, CMD_FRAME); */ irlap_start_final_timer(self, self->final_timeout/2); irlap_next_state(self, LAP_NRM_P); irlap_connect_confirm(self, skb); break; case RECV_DISC_FRAME: del_timer(&self->final_timer); irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_DISC_INDICATION); break; /* DM handled in irlap_frame.c, irlap_driver_rcv() */ default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %d, %s\n", event, irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_offline (self, event, skb, info) * * OFFLINE state, not used for now! * */ static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { IRDA_DEBUG( 0, __FUNCTION__ "(), Unknown event\n"); return -1; } /* * Function irlap_state_xmit_p (self, event, skb, info) * * XMIT, Only the primary station has right to transmit, and we * therefore do not expect to receive any transmissions from other * stations. * */ static int irlap_state_xmit_p(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; switch (event) { case SEND_I_CMD: /* * Only send frame if send-window > 0. */ if ((self->window > 0) && (!self->remote_busy)) { /* * Test if we have transmitted more bytes over the * link than its possible to do with the current * speed and turn-around-time. */ if ((skb->len+self->bofs_count) > self->bytes_left) { IRDA_DEBUG(4, __FUNCTION__ "(), Not allowed to " "transmit more bytes!\n"); skb_queue_head(&self->tx_list, skb); /* * We should switch state to LAP_NRM_P, but * that is not possible since we must be sure * that we poll the other side. Since we have * used up our time, the poll timer should * trigger anyway now,so we just wait for it * DB */ return -EPROTO; } self->bytes_left -= (skb->len + self->bofs_count); /* * Send data with poll bit cleared only if window > 1 * and there is more frames after this one to be sent */ if ((self->window > 1) && skb_queue_len( &self->tx_list) > 0) { irlap_send_data_primary(self, skb); irlap_next_state(self, LAP_XMIT_P); } else { irlap_send_data_primary_poll(self, skb); irlap_next_state(self, LAP_NRM_P); /* * Make sure state machine does not try to send * any more frames */ ret = -EPROTO; } #ifdef CONFIG_IRDA_FAST_RR /* Peer may want to reply immediately */ self->fast_RR = FALSE; #endif } else { IRDA_DEBUG(4, __FUNCTION__ "(), Unable to send! remote busy?\n"); skb_queue_head(&self->tx_list, skb); /* * The next ret is important, because it tells * irlap_next_state _not_ to deliver more frames */ ret = -EPROTO; } break; case POLL_TIMER_EXPIRED: irlap_send_rr_frame(self, CMD_FRAME); irlap_start_final_timer(self, self->final_timeout); irlap_next_state(self, LAP_NRM_P); break; case DISCONNECT_REQUEST: del_timer(&self->poll_timer); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_disc_frame(self); irlap_flush_all_queues(self); irlap_start_final_timer(self, self->final_timeout); self->retry_count = 0; irlap_next_state(self, LAP_PCLOSE); break; default: IRDA_DEBUG(0, __FUNCTION__ "(), Unknown event %s\n", irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -EINVAL; break; } return ret; } /* * Function irlap_state_pclose (event, skb, info) * * PCLOSE state */ static int irlap_state_pclose(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(1, __FUNCTION__ "()\n"); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case RECV_UA_RSP: del_timer(&self->final_timer); irlap_apply_default_connection_parameters(self); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_DISC_INDICATION); break; case FINAL_TIMER_EXPIRED: if (self->retry_count < self->N3) { irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_disc_frame(self); irlap_start_final_timer(self, self->final_timeout); self->retry_count++; /* Keep state */ } else { irlap_apply_default_connection_parameters(self); /* * Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_NO_RESPONSE); } break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %d\n", event); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_nrm_p (self, event, skb, info) * * NRM_P (Normal Response Mode as Primary), The primary station has given * permissions to a secondary station to transmit IrLAP resonse frames * (by sending a frame with the P bit set). The primary station will not * transmit any frames and is expecting to receive frames only from the * secondary to which transmission permissions has been given. */ static int irlap_state_nrm_p(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; int ns_status; int nr_status; switch (event) { case RECV_I_RSP: /* Optimize for the common case */ /* FIXME: must check for remote_busy below */ #ifdef CONFIG_IRDA_FAST_RR /* * Reset the fast_RR so we can use the fast RR code with * full speed the next time since peer may have more frames * to transmitt */ self->fast_RR = FALSE; #endif ASSERT( info != NULL, return -1;); ns_status = irlap_validate_ns_received(self, info->ns); nr_status = irlap_validate_nr_received(self, info->nr); /* * Check for expected I(nformation) frame */ if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { /* * poll bit cleared? */ if (!info->pf) { self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received( self, info->nr); self->ack_required = TRUE; /* Keep state, do not move this line */ irlap_next_state(self, LAP_NRM_P); irlap_data_indication(self, skb); } else { del_timer(&self->final_timer); self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received(self, info->nr); /* * Got expected NR, so reset the * retry_count. This is not done by IrLAP, * which is strange! */ self->retry_count = 0; self->ack_required = TRUE; irlap_wait_min_turn_around(self, &self->qos_tx); /* * Important to switch state before calling * upper layers */ irlap_next_state(self, LAP_XMIT_P); irlap_data_indication(self, skb); /* This is the last frame */ irlap_start_poll_timer(self, self->poll_timeout); } break; } /* * Unexpected next to send (Ns) */ if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) { if (!info->pf) { irlap_update_nr_received(self, info->nr); /* * Wait until the last frame before doing * anything */ /* Keep state */ irlap_next_state(self, LAP_NRM_P); } else { IRDA_DEBUG( 4, __FUNCTION__ "(), missing or duplicate frame!\n"); /* Update Nr received */ irlap_update_nr_received(self, info->nr); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, CMD_FRAME); self->ack_required = FALSE; irlap_start_final_timer(self, self->final_timeout); irlap_next_state(self, LAP_NRM_P); } dev_kfree_skb(skb); break; } /* * Unexpected next to receive (Nr) */ if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) { if (info->pf) { self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received(self, info->nr); /* Resend rejected frames */ irlap_resend_rejected_frames(self, CMD_FRAME); self->ack_required = FALSE; irlap_start_final_timer(self, self->final_timeout); /* Keep state, do not move this line */ irlap_next_state(self, LAP_NRM_P); irlap_data_indication(self, skb); } else { /* * Do not resend frames until the last * frame has arrived from the other * device. This is not documented in * IrLAP!! */ self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received(self, info->nr); self->ack_required = FALSE; /* Keep state, do not move this line!*/ irlap_next_state(self, LAP_NRM_P); irlap_data_indication(self, skb); } break; } /* * Unexpected next to send (Ns) and next to receive (Nr) * Not documented by IrLAP! */ if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_UNEXPECTED)) { IRDA_DEBUG( 4, "IrLAP: unexpected nr and ns!\n"); if (info->pf) { /* Resend rejected frames */ irlap_resend_rejected_frames(self, CMD_FRAME); /* Give peer some time to retransmit! */ irlap_start_final_timer(self, self->final_timeout); /* Keep state, do not move this line */ irlap_next_state(self, LAP_NRM_P); } else { /* Update Nr received */ /* irlap_update_nr_received( info->nr); */ self->ack_required = FALSE; } break; } /* * Invalid NR or NS */ if ((nr_status == NR_INVALID) || (ns_status == NS_INVALID)) { if (info->pf) { del_timer(&self->final_timer); irlap_next_state(self, LAP_RESET_WAIT); irlap_disconnect_indication(self, LAP_RESET_INDICATION); self->xmitflag = TRUE; } else { del_timer(&self->final_timer); irlap_disconnect_indication(self, LAP_RESET_INDICATION); self->xmitflag = FALSE; } break; } IRDA_DEBUG(1, __FUNCTION__ "(), Not implemented!\n"); IRDA_DEBUG(1, __FUNCTION__ "(), event=%s, ns_status=%d, nr_status=%d\n", irlap_event[ event], ns_status, nr_status); break; case RECV_UI_FRAME: /* poll bit cleared? */ if (!info->pf) { irlap_unit_data_indication(self, skb); irlap_next_state(self, LAP_NRM_P); } else { del_timer(&self->final_timer); irlap_unit_data_indication(self, skb); irlap_start_poll_timer(self, self->poll_timeout); } break; case RECV_RR_RSP: /* * If you get a RR, the remote isn't busy anymore, * no matter what the NR */ self->remote_busy = FALSE; /* * Nr as expected? */ ret = irlap_validate_nr_received(self, info->nr); if (ret == NR_EXPECTED) { /* Stop final timer */ del_timer(&self->final_timer); /* Update Nr received */ irlap_update_nr_received(self, info->nr); /* * Got expected NR, so reset the retry_count. This * is not done by the IrLAP standard , which is * strange! DB. */ self->retry_count = 0; irlap_wait_min_turn_around(self, &self->qos_tx); irlap_next_state(self, LAP_XMIT_P); /* Start poll timer */ irlap_start_poll_timer(self, self->poll_timeout); } else if (ret == NR_UNEXPECTED) { ASSERT(info != NULL, return -1;); /* * Unexpected nr! */ /* Update Nr received */ irlap_update_nr_received(self, info->nr); IRDA_DEBUG(4, "RECV_RR_FRAME: Retrans:%d, nr=%d, va=%d, " "vs=%d, vr=%d\n", self->retry_count, info->nr, self->va, self->vs, self->vr); /* Resend rejected frames */ irlap_resend_rejected_frames(self, CMD_FRAME); irlap_next_state(self, LAP_NRM_P); } else if (ret == NR_INVALID) { IRDA_DEBUG(1, __FUNCTION__ "(), Received RR with " "invalid nr !\n"); del_timer(&self->final_timer); irlap_next_state(self, LAP_RESET_WAIT); irlap_disconnect_indication(self, LAP_RESET_INDICATION); self->xmitflag = TRUE; } if (skb) dev_kfree_skb(skb); break; case RECV_RNR_FRAME: IRDA_DEBUG(4, "irlap_state_nrm_p: RECV_RNR_FRAME: Retrans:%d, " "nr=%d, va=%d, vs=%d, vr=%d\n", self->retry_count, info->nr, self->va, self->vs, self->vr); ASSERT(info != NULL, return -1;); /* Stop final timer */ del_timer(&self->final_timer); self->remote_busy = TRUE; /* Update Nr received */ irlap_update_nr_received(self, info->nr); irlap_next_state(self, LAP_XMIT_P); /* Start poll timer */ irlap_start_poll_timer(self, self->poll_timeout); if (skb) dev_kfree_skb(skb); break; case RECV_FRMR_RSP: del_timer(&self->final_timer); self->xmitflag = TRUE; irlap_next_state(self, LAP_RESET_WAIT); irlap_reset_indication(self); if (skb) dev_kfree_skb(skb); break; case FINAL_TIMER_EXPIRED: /* * We are allowed to wait for additional 300 ms if * final timer expires when we are in the middle * of receiving a frame (page 45, IrLAP). Check that * we only do this once for each frame. */ if (irda_device_is_receiving(self->netdev) && !self->add_wait) { IRDA_DEBUG(4, "FINAL_TIMER_EXPIRED when receiving a " "frame! Waiting a little bit more!\n"); irlap_start_final_timer(self, MSECS_TO_JIFFIES(300)); /* * Don't allow this to happen one more time in a row, * or else we can get a pretty tight loop here if * if we only receive half a frame. DB. */ self->add_wait = TRUE; break; } self->add_wait = FALSE; if ((self->retry_count < self->N2) && (self->retry_count != self->N1)) { irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, CMD_FRAME); irlap_start_final_timer(self, self->final_timeout); self->retry_count++; IRDA_DEBUG(4, "irlap_state_nrm_p: FINAL_TIMER_EXPIRED:" " retry_count=%d\n", self->retry_count); /* Keep state */ } else if (self->retry_count == self->N1) { irlap_status_indication(STATUS_NO_ACTIVITY); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, CMD_FRAME); irlap_start_final_timer(self, self->final_timeout); self->retry_count++; IRDA_DEBUG(4, "retry count = N1; retry_count=%d\n", self->retry_count); /* Keep state */ } else if (self->retry_count >= self->N2) { irlap_apply_default_connection_parameters(self); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_NO_RESPONSE); } break; case RECV_DISC_FRAME: /* FIXME: Check how this is in the standard! */ IRDA_DEBUG(1, __FUNCTION__ "(), RECV_DISC_FRAME()\n"); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_ua_response_frame(self, NULL); del_timer(&self->final_timer); /* del_timer( &self->poll_timer); */ irlap_flush_all_queues(self); irlap_apply_default_connection_parameters(self); irlap_disconnect_indication(self, LAP_DISC_INDICATION); if (skb) dev_kfree_skb(skb); break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %s\n", irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_reset_wait (event, skb, info) * * We have informed the service user of a reset condition, and is * awaiting reset of disconnect request. * */ static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(3, __FUNCTION__ "(), event = %s\n", irlap_event[event]); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case RESET_REQUEST: if (self->xmitflag) { irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_snrm_frame(self, NULL); irlap_start_final_timer(self, self->final_timeout); irlap_next_state(self, LAP_RESET); } else { irlap_start_final_timer(self, self->final_timeout); irlap_next_state(self, LAP_RESET); } break; case DISCONNECT_REQUEST: irlap_wait_min_turn_around( self, &self->qos_tx); irlap_send_disc_frame( self); irlap_flush_all_queues( self); irlap_start_final_timer( self, self->final_timeout); self->retry_count = 0; irlap_next_state( self, LAP_PCLOSE); break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %s\n", irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_reset (self, event, skb, info) * * We have sent a SNRM reset command to the peer layer, and is awaiting * reply. * */ static int irlap_state_reset(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(3, __FUNCTION__ "(), event = %s\n", irlap_event[event]); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case RECV_DISC_FRAME: del_timer(&self->final_timer); irlap_apply_default_connection_parameters(self); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_NO_RESPONSE); break; case RECV_UA_RSP: del_timer(&self->final_timer); /* Initiate connection state */ irlap_initiate_connection_state(self); irlap_reset_confirm(); self->remote_busy = FALSE; irlap_next_state(self, LAP_XMIT_P); irlap_start_poll_timer(self, self->poll_timeout); break; case FINAL_TIMER_EXPIRED: if (self->retry_count < 3) { irlap_wait_min_turn_around(self, &self->qos_tx); ASSERT(self->netdev != NULL, return -1;); irlap_send_snrm_frame(self, self->qos_dev); self->retry_count++; /* Experimental!! */ irlap_start_final_timer(self, self->final_timeout); irlap_next_state(self, LAP_RESET); } else if (self->retry_count >= self->N3) { irlap_apply_default_connection_parameters(self); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_NO_RESPONSE); } break; case RECV_SNRM_CMD: /* * SNRM frame is not allowed to contain an I-field in this * state */ if (!info) { IRDA_DEBUG(3, __FUNCTION__ "(), RECV_SNRM_CMD\n"); irlap_initiate_connection_state(self); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_ua_response_frame(self, &self->qos_rx); irlap_reset_confirm(); irlap_start_wd_timer(self, self->wd_timeout); irlap_next_state(self, LAP_NDM); } else { IRDA_DEBUG(0, __FUNCTION__ "(), SNRM frame contained an I " "field!\n"); dev_kfree_skb(skb); } break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %s\n", irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -1; break; } return ret; } /* * Function irlap_state_xmit_s (event, skb, info) * * XMIT_S, The secondary station has been given the right to transmit, * and we therefor do not expect to receive any transmissions from other * stations. */ static int irlap_state_xmit_s(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(4, __FUNCTION__ "(), event=%s\n", irlap_event[ event]); ASSERT(self != NULL, return -ENODEV;); ASSERT(self->magic == LAP_MAGIC, return -EBADR;); switch (event) { case SEND_I_CMD: /* * Send frame only if send window > 1 */ if ((self->window > 0) && (!self->remote_busy)) { /* * Test if we have transmitted more bytes over the * link than its possible to do with the current * speed and turn-around-time. */ if ((skb->len+self->bofs_count) > self->bytes_left) { skb_queue_head(&self->tx_list, skb); /* * Switch to NRM_S, this is only possible * when we are in secondary mode, since we * must be sure that we don't miss any RR * frames */ irlap_next_state(self, LAP_NRM_S); return -EPROTO; /* Try again later */ } self->bytes_left -= (skb->len + self->bofs_count); /* * Send data with final bit cleared only if window > 1 * and there is more frames to be sent */ if ((self->window > 1) && skb_queue_len(&self->tx_list) > 0) { irlap_send_data_secondary(self, skb); irlap_next_state(self, LAP_XMIT_S); } else { irlap_send_data_secondary_final(self, skb); irlap_next_state(self, LAP_NRM_S); /* * Make sure state machine does not try to send * any more frames */ ret = -EPROTO; } } else { IRDA_DEBUG(1, __FUNCTION__ "(), Unable to send!\n"); skb_queue_head( &self->tx_list, skb); ret = -EPROTO; } break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %s\n", irlap_event[event]); if (skb) dev_kfree_skb(skb); ret = -EINVAL; break; } return ret; } /* * Function irlap_state_nrm_s (event, skb, info) * * NRM_S (Normal Response Mode as Secondary) state, in this state we are * expecting to receive frames from the primary station * */ static int irlap_state_nrm_s(struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ns_status; int nr_status; int ret = 0; IRDA_DEBUG(4, __FUNCTION__ "(), event=%s\n", irlap_event[ event]); ASSERT(self != NULL, return -1;); ASSERT(self->magic == LAP_MAGIC, return -1;); switch (event) { case RECV_I_CMD: /* Optimize for the common case */ /* FIXME: must check for remote_busy below */ IRDA_DEBUG(4, __FUNCTION__ "(), event=%s nr=%d, vs=%d, ns=%d, " "vr=%d, pf=%d\n", irlap_event[event], info->nr, self->vs, info->ns, self->vr, info->pf); self->retry_count = 0; ns_status = irlap_validate_ns_received(self, info->ns); nr_status = irlap_validate_nr_received(self, info->nr); /* * Check for expected I(nformation) frame */ if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { /* * poll bit cleared? */ if (!info->pf) { self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received(self, info->nr); self->ack_required = TRUE; /* * Starting WD-timer here is optional, but * not recommended. Note 6 IrLAP p. 83 */ /* irda_start_timer(WD_TIMER, self->wd_timeout); */ /* Keep state, do not move this line */ irlap_next_state(self, LAP_NRM_S); irlap_data_indication( self, skb); break; } else { self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received( self, info->nr); /* * We should wait before sending RR, and * also before changing to XMIT_S * state. (note 1, IrLAP p. 82) */ irlap_wait_min_turn_around(self, &self->qos_tx); /* * Give higher layers a chance to * immediately reply with some data before * we decide if we should send a RR frame * or not */ irlap_data_indication(self, skb); /* Any pending data requests? */ if ((skb_queue_len(&self->tx_list) > 0) && (self->window > 0)) { self->ack_required = TRUE; del_timer(&self->wd_timer); irlap_next_state(self, LAP_XMIT_S); } else { irlap_send_rr_frame(self, RSP_FRAME); irlap_start_wd_timer(self, self->wd_timeout); /* Keep the state */ irlap_next_state(self, LAP_NRM_S); } break; } } /* * Check for Unexpected next to send (Ns) */ if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) { /* Unexpected next to send, with final bit cleared */ if (!info->pf) { irlap_update_nr_received(self, info->nr); irlap_start_wd_timer(self, self->wd_timeout); } else { /* Update Nr received */ irlap_update_nr_received(self, info->nr); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, CMD_FRAME); irlap_start_wd_timer(self, self->wd_timeout); } dev_kfree_skb(skb); break; } /* * Unexpected Next to Receive(NR) ? */ if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) { if (info->pf) { IRDA_DEBUG(4, "RECV_I_RSP: frame(s) lost\n"); self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received(self, info->nr); /* Resend rejected frames */ irlap_resend_rejected_frames(self, RSP_FRAME); /* Keep state, do not move this line */ irlap_next_state(self, LAP_NRM_S); irlap_data_indication(self, skb); irlap_start_wd_timer(self, self->wd_timeout); break; } /* * This is not documented in IrLAP!! Unexpected NR * with poll bit cleared */ if (!info->pf) { self->vr = (self->vr + 1) % 8; /* Update Nr received */ irlap_update_nr_received(self, info->nr); /* Keep state, do not move this line */ irlap_next_state(self, LAP_NRM_S); irlap_data_indication(self, skb); irlap_start_wd_timer(self, self->wd_timeout); } } if (ret == NR_INVALID) { IRDA_DEBUG(0, "NRM_S, NR_INVALID not implemented!\n"); } if (ret == NS_INVALID) { IRDA_DEBUG(0, "NRM_S, NS_INVALID not implemented!\n"); } break; case RECV_UI_FRAME: /* * poll bit cleared? */ if (!info->pf) { irlap_unit_data_indication(self, skb); irlap_next_state(self, LAP_NRM_S); /* Keep state */ } else { /* * Any pending data requests? */ if ((skb_queue_len(&self->tx_list) > 0) && (self->window > 0) && !self->remote_busy) { irlap_unit_data_indication(self, skb); del_timer(&self->wd_timer); irlap_next_state(self, LAP_XMIT_S); } else { irlap_unit_data_indication(self, skb); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, RSP_FRAME); self->ack_required = FALSE; irlap_start_wd_timer(self, self->wd_timeout); /* Keep the state */ irlap_next_state(self, LAP_NRM_S); } } break; case RECV_RR_CMD: self->retry_count = 0; /* * Nr as expected? */ nr_status = irlap_validate_nr_received(self, info->nr); if (nr_status == NR_EXPECTED) { if ((skb_queue_len( &self->tx_list) > 0) && (self->window > 0)) { self->remote_busy = FALSE; /* Update Nr received */ irlap_update_nr_received(self, info->nr); del_timer(&self->wd_timer); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_next_state(self, LAP_XMIT_S); } else { self->remote_busy = FALSE; /* Update Nr received */ irlap_update_nr_received(self, info->nr); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, RSP_FRAME); irlap_start_wd_timer(self, self->wd_timeout); irlap_next_state(self, LAP_NRM_S); } } else if (nr_status == NR_UNEXPECTED) { self->remote_busy = FALSE; irlap_update_nr_received(self, info->nr); irlap_resend_rejected_frames( self, RSP_FRAME); irlap_start_wd_timer(self, self->wd_timeout); /* Keep state */ irlap_next_state(self, LAP_NRM_S); } else { IRDA_DEBUG(1, __FUNCTION__ "(), invalid nr not implemented!\n"); } if (skb) dev_kfree_skb(skb); break; case RECV_SNRM_CMD: /* SNRM frame is not allowed to contain an I-field */ if (!info) { del_timer(&self->wd_timer); IRDA_DEBUG(1, __FUNCTION__ "(), received SNRM cmd\n"); irlap_next_state(self, LAP_RESET_CHECK); irlap_reset_indication(self); } else { IRDA_DEBUG(0, __FUNCTION__ "(), SNRM frame contained an " "I-field!\n"); dev_kfree_skb(skb); } break; case WD_TIMER_EXPIRED: /* * Wait until retry_count * n matches negotiated threshold/ * disconnect time (note 2 in IrLAP p. 82) */ IRDA_DEBUG(1, __FUNCTION__ "(), retry_count = %d\n", self->retry_count); if ((self->retry_count < (self->N2/2)) && (self->retry_count != self->N1/2)) { irlap_start_wd_timer(self, self->wd_timeout); self->retry_count++; } else if (self->retry_count == (self->N1/2)) { irlap_status_indication(STATUS_NO_ACTIVITY); irlap_start_wd_timer(self, self->wd_timeout); self->retry_count++; } else if (self->retry_count >= self->N2/2) { irlap_apply_default_connection_parameters(self); /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_disconnect_indication(self, LAP_NO_RESPONSE); } break; case RECV_DISC_FRAME: /* Always switch state before calling upper layers */ irlap_next_state(self, LAP_NDM); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_ua_response_frame(self, NULL); del_timer(&self->wd_timer); irlap_flush_all_queues(self); irlap_apply_default_connection_parameters(self); irlap_disconnect_indication(self, LAP_DISC_INDICATION); if (skb) dev_kfree_skb(skb); break; case RECV_DISCOVERY_XID_CMD: irlap_wait_min_turn_around(self, &self->qos_tx); irlap_send_rr_frame(self, RSP_FRAME); self->ack_required = TRUE; irlap_start_wd_timer(self, self->wd_timeout); irlap_next_state(self, LAP_NRM_S); break; case RECV_TEST_CMD: /* Remove test frame header */ skb_pull(skb, sizeof(struct test_frame)); irlap_wait_min_turn_around(self, &self->qos_tx); irlap_start_wd_timer(self, self->wd_timeout); /* Send response (info will be copied) */ irlap_send_test_frame(self, info->daddr, skb); dev_kfree_skb(skb); break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %d, (%s)\n", event, irlap_event[event]); ret = -1; break; } return ret; } /* * Function irlap_state_sclose (self, event, skb, info) * * * */ static int irlap_state_sclose( struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { IRDA_DEBUG( 0, __FUNCTION__ "(), Not implemented!\n"); return -1; } static int irlap_state_reset_check( struct irlap_cb *self, IRLAP_EVENT event, struct sk_buff *skb, struct irlap_info *info) { int ret = 0; IRDA_DEBUG(1, __FUNCTION__ "(), event=%s\n", irlap_event[ event]); ASSERT( self != NULL, return -ENODEV;); ASSERT( self->magic == LAP_MAGIC, return -EBADR;); switch(event) { case RESET_RESPONSE: irlap_send_ua_response_frame( self, &self->qos_rx); irlap_initiate_connection_state( self); irlap_start_wd_timer( self, WD_TIMEOUT); irlap_flush_all_queues( self); irlap_next_state( self, LAP_NRM_S); break; case DISCONNECT_REQUEST: irlap_wait_min_turn_around( self, &self->qos_tx); /* irlap_send_rd_frame(self); */ irlap_start_wd_timer( self, WD_TIMEOUT); break; default: IRDA_DEBUG(1, __FUNCTION__ "(), Unknown event %d, (%s)\n", event, irlap_event[event]); ret = -1; break; } return ret; }