static void nr_t2timer_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; if (sk->protinfo.nr->condition & NR_COND_ACK_PENDING) { sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING; nr_enquiry_response(sk); } }
static void nr_t2timer_expiry(unsigned long param) { struct sock *sk = (struct sock *)param; struct nr_sock *nr = nr_sk(sk); bh_lock_sock(sk); if (nr->condition & NR_COND_ACK_PENDING) { nr->condition &= ~NR_COND_ACK_PENDING; nr_enquiry_response(sk); } bh_unlock_sock(sk); }
/* * NET/ROM TIMER * * This routine is called every 100ms. Decrement timer by this * amount - if expired then process the event. */ static void nr_timer(unsigned long param) { struct sock *sk = (struct sock *)param; switch (sk->protinfo.nr->state) { case NR_STATE_0: /* Magic here: If we listen() and a new link dies before it is accepted() it isn't 'dead' so doesn't get removed. */ if (sk->destroy || (sk->state == TCP_LISTEN && sk->dead)) { del_timer(&sk->timer); nr_destroy_socket(sk); return; } break; case NR_STATE_3: /* * Check for the state of the receive buffer. */ if (sk->rmem_alloc < (sk->rcvbuf / 2) && (sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)) { sk->protinfo.nr->condition &= ~NR_COND_OWN_RX_BUSY; sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING; sk->protinfo.nr->vl = sk->protinfo.nr->vr; nr_write_internal(sk, NR_INFOACK); break; } /* * Check for frames to transmit. */ nr_kick(sk); break; default: break; } if (sk->protinfo.nr->t2timer > 0 && --sk->protinfo.nr->t2timer == 0) { if (sk->protinfo.nr->state == NR_STATE_3) { if (sk->protinfo.nr->condition & NR_COND_ACK_PENDING) { sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING; nr_enquiry_response(sk); } } } if (sk->protinfo.nr->t4timer > 0 && --sk->protinfo.nr->t4timer == 0) { sk->protinfo.nr->condition &= ~NR_COND_PEER_RX_BUSY; } if (sk->protinfo.nr->t1timer == 0 || --sk->protinfo.nr->t1timer > 0) { nr_set_timer(sk); return; } switch (sk->protinfo.nr->state) { case NR_STATE_1: if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) { nr_clear_queues(sk); sk->protinfo.nr->state = NR_STATE_0; sk->state = TCP_CLOSE; sk->err = ETIMEDOUT; sk->shutdown |= SEND_SHUTDOWN; if (!sk->dead) sk->state_change(sk); sk->dead = 1; } else { sk->protinfo.nr->n2count++; nr_write_internal(sk, NR_CONNREQ); } break; case NR_STATE_2: if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) { nr_clear_queues(sk); sk->protinfo.nr->state = NR_STATE_0; sk->state = TCP_CLOSE; sk->err = ETIMEDOUT; sk->shutdown |= SEND_SHUTDOWN; if (!sk->dead) sk->state_change(sk); sk->dead = 1; } else { sk->protinfo.nr->n2count++; nr_write_internal(sk, NR_DISCREQ); } break; case NR_STATE_3: if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) { nr_clear_queues(sk); sk->protinfo.nr->state = NR_STATE_0; sk->state = TCP_CLOSE; sk->err = ETIMEDOUT; sk->shutdown |= SEND_SHUTDOWN; if (!sk->dead) sk->state_change(sk); sk->dead = 1; } else { sk->protinfo.nr->n2count++; nr_requeue_frames(sk); } break; } sk->protinfo.nr->t1timer = sk->protinfo.nr->t1; nr_set_timer(sk); }
/* * State machine for state 3, Connected State. * The handling of the timer(s) is in file nr_timer.c * Handling of state 0 and connection release is in netrom.c. */ static int nr_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype) { struct nr_sock *nrom = nr_sk(sk); struct sk_buff_head temp_queue; struct sk_buff *skbn; unsigned short save_vr; unsigned short nr, ns; int queued = 0; nr = skb->data[18]; ns = skb->data[17]; switch (frametype) { case NR_CONNREQ: nr_write_internal(sk, NR_CONNACK); break; case NR_DISCREQ: nr_write_internal(sk, NR_DISCACK); nr_disconnect(sk, 0); break; case NR_CONNACK | NR_CHOKE_FLAG: case NR_DISCACK: nr_disconnect(sk, ECONNRESET); break; case NR_INFOACK: case NR_INFOACK | NR_CHOKE_FLAG: case NR_INFOACK | NR_NAK_FLAG: case NR_INFOACK | NR_NAK_FLAG | NR_CHOKE_FLAG: if (frametype & NR_CHOKE_FLAG) { nrom->condition |= NR_COND_PEER_RX_BUSY; nr_start_t4timer(sk); } else { nrom->condition &= ~NR_COND_PEER_RX_BUSY; nr_stop_t4timer(sk); } if (!nr_validate_nr(sk, nr)) { break; } if (frametype & NR_NAK_FLAG) { nr_frames_acked(sk, nr); nr_send_nak_frame(sk); } else { if (nrom->condition & NR_COND_PEER_RX_BUSY) { nr_frames_acked(sk, nr); } else { nr_check_iframes_acked(sk, nr); } } break; case NR_INFO: case NR_INFO | NR_NAK_FLAG: case NR_INFO | NR_CHOKE_FLAG: case NR_INFO | NR_MORE_FLAG: case NR_INFO | NR_NAK_FLAG | NR_CHOKE_FLAG: case NR_INFO | NR_CHOKE_FLAG | NR_MORE_FLAG: case NR_INFO | NR_NAK_FLAG | NR_MORE_FLAG: case NR_INFO | NR_NAK_FLAG | NR_CHOKE_FLAG | NR_MORE_FLAG: if (frametype & NR_CHOKE_FLAG) { nrom->condition |= NR_COND_PEER_RX_BUSY; nr_start_t4timer(sk); } else { nrom->condition &= ~NR_COND_PEER_RX_BUSY; nr_stop_t4timer(sk); } if (nr_validate_nr(sk, nr)) { if (frametype & NR_NAK_FLAG) { nr_frames_acked(sk, nr); nr_send_nak_frame(sk); } else { if (nrom->condition & NR_COND_PEER_RX_BUSY) { nr_frames_acked(sk, nr); } else { nr_check_iframes_acked(sk, nr); } } } queued = 1; skb_queue_head(&nrom->reseq_queue, skb); if (nrom->condition & NR_COND_OWN_RX_BUSY) break; skb_queue_head_init(&temp_queue); do { save_vr = nrom->vr; while ((skbn = skb_dequeue(&nrom->reseq_queue)) != NULL) { ns = skbn->data[17]; if (ns == nrom->vr) { if (nr_queue_rx_frame(sk, skbn, frametype & NR_MORE_FLAG) == 0) { nrom->vr = (nrom->vr + 1) % NR_MODULUS; } else { nrom->condition |= NR_COND_OWN_RX_BUSY; skb_queue_tail(&temp_queue, skbn); } } else if (nr_in_rx_window(sk, ns)) { skb_queue_tail(&temp_queue, skbn); } else { kfree_skb(skbn); } } while ((skbn = skb_dequeue(&temp_queue)) != NULL) { skb_queue_tail(&nrom->reseq_queue, skbn); } } while (save_vr != nrom->vr); /* * Window is full, ack it immediately. */ if (((nrom->vl + nrom->window) % NR_MODULUS) == nrom->vr) { nr_enquiry_response(sk); } else { if (!(nrom->condition & NR_COND_ACK_PENDING)) { nrom->condition |= NR_COND_ACK_PENDING; nr_start_t2timer(sk); } } break; case NR_RESET: if (sysctl_netrom_reset_circuit) nr_disconnect(sk, ECONNRESET); break; default: break; } return queued; }