From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/net/ax25/ax25_ds_in.c | 302 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 302 insertions(+) create mode 100644 kernel/net/ax25/ax25_ds_in.c (limited to 'kernel/net/ax25/ax25_ds_in.c') diff --git a/kernel/net/ax25/ax25_ds_in.c b/kernel/net/ax25/ax25_ds_in.c new file mode 100644 index 000000000..9bd31e88a --- /dev/null +++ b/kernel/net/ax25/ax25_ds_in.c @@ -0,0 +1,302 @@ +/* + * 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. + * + * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * State machine for state 1, Awaiting Connection State. + * The handling of the timer(s) is in file ax25_ds_timer.c. + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_ds_state1_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type) +{ + switch (frametype) { + case AX25_SABM: + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + break; + + case AX25_SABME: + ax25->modulus = AX25_EMODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW]; + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_DM, pf, AX25_RESPONSE); + break; + + case AX25_UA: + ax25_calculate_rtt(ax25); + ax25_stop_t1timer(ax25); + ax25_start_t3timer(ax25); + ax25_start_idletimer(ax25); + ax25->vs = 0; + ax25->va = 0; + ax25->vr = 0; + ax25->state = AX25_STATE_3; + ax25->n2count = 0; + if (ax25->sk != NULL) { + bh_lock_sock(ax25->sk); + ax25->sk->sk_state = TCP_ESTABLISHED; + /* + * For WAIT_SABM connections we will produce an accept + * ready socket here + */ + if (!sock_flag(ax25->sk, SOCK_DEAD)) + ax25->sk->sk_state_change(ax25->sk); + bh_unlock_sock(ax25->sk); + } + ax25_dama_on(ax25); + + /* according to DK4EG's spec we are required to + * send a RR RESPONSE FINAL NR=0. + */ + + ax25_std_enquiry_response(ax25); + break; + + case AX25_DM: + if (pf) + ax25_disconnect(ax25, ECONNREFUSED); + break; + + default: + if (pf) + ax25_send_control(ax25, AX25_SABM, AX25_POLLON, AX25_COMMAND); + break; + } + + return 0; +} + +/* + * State machine for state 2, Awaiting Release State. + * The handling of the timer(s) is in file ax25_ds_timer.c + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_ds_state2_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int pf, int type) +{ + switch (frametype) { + case AX25_SABM: + case AX25_SABME: + ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); + ax25_dama_off(ax25); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_dama_off(ax25); + ax25_disconnect(ax25, 0); + break; + + case AX25_DM: + case AX25_UA: + if (pf) { + ax25_dama_off(ax25); + ax25_disconnect(ax25, 0); + } + break; + + case AX25_I: + case AX25_REJ: + case AX25_RNR: + case AX25_RR: + if (pf) { + ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND); + ax25_dama_off(ax25); + } + break; + + default: + break; + } + + return 0; +} + +/* + * State machine for state 3, Connected State. + * The handling of the timer(s) is in file ax25_timer.c + * Handling of state 0 and connection release is in ax25.c. + */ +static int ax25_ds_state3_machine(ax25_cb *ax25, struct sk_buff *skb, int frametype, int ns, int nr, int pf, int type) +{ + int queued = 0; + + switch (frametype) { + case AX25_SABM: + case AX25_SABME: + if (frametype == AX25_SABM) { + ax25->modulus = AX25_MODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_WINDOW]; + } else { + ax25->modulus = AX25_EMODULUS; + ax25->window = ax25->ax25_dev->values[AX25_VALUES_EWINDOW]; + } + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_stop_t1timer(ax25); + ax25_start_t3timer(ax25); + ax25_start_idletimer(ax25); + ax25->condition = 0x00; + ax25->vs = 0; + ax25->va = 0; + ax25->vr = 0; + ax25_requeue_frames(ax25); + ax25_dama_on(ax25); + break; + + case AX25_DISC: + ax25_send_control(ax25, AX25_UA, pf, AX25_RESPONSE); + ax25_dama_off(ax25); + ax25_disconnect(ax25, 0); + break; + + case AX25_DM: + ax25_dama_off(ax25); + ax25_disconnect(ax25, ECONNRESET); + break; + + case AX25_RR: + case AX25_RNR: + if (frametype == AX25_RR) + ax25->condition &= ~AX25_COND_PEER_RX_BUSY; + else + ax25->condition |= AX25_COND_PEER_RX_BUSY; + + if (ax25_validate_nr(ax25, nr)) { + if (ax25_check_iframes_acked(ax25, nr)) + ax25->n2count=0; + if (type == AX25_COMMAND && pf) + ax25_ds_enquiry_response(ax25); + } else { + ax25_ds_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + + case AX25_REJ: + ax25->condition &= ~AX25_COND_PEER_RX_BUSY; + + if (ax25_validate_nr(ax25, nr)) { + if (ax25->va != nr) + ax25->n2count=0; + + ax25_frames_acked(ax25, nr); + ax25_calculate_rtt(ax25); + ax25_stop_t1timer(ax25); + ax25_start_t3timer(ax25); + ax25_requeue_frames(ax25); + + if (type == AX25_COMMAND && pf) + ax25_ds_enquiry_response(ax25); + } else { + ax25_ds_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + } + break; + + case AX25_I: + if (!ax25_validate_nr(ax25, nr)) { + ax25_ds_nr_error_recovery(ax25); + ax25->state = AX25_STATE_1; + break; + } + if (ax25->condition & AX25_COND_PEER_RX_BUSY) { + ax25_frames_acked(ax25, nr); + ax25->n2count = 0; + } else { + if (ax25_check_iframes_acked(ax25, nr)) + ax25->n2count = 0; + } + if (ax25->condition & AX25_COND_OWN_RX_BUSY) { + if (pf) ax25_ds_enquiry_response(ax25); + break; + } + if (ns == ax25->vr) { + ax25->vr = (ax25->vr + 1) % ax25->modulus; + queued = ax25_rx_iframe(ax25, skb); + if (ax25->condition & AX25_COND_OWN_RX_BUSY) + ax25->vr = ns; /* ax25->vr - 1 */ + ax25->condition &= ~AX25_COND_REJECT; + if (pf) { + ax25_ds_enquiry_response(ax25); + } else { + if (!(ax25->condition & AX25_COND_ACK_PENDING)) { + ax25->condition |= AX25_COND_ACK_PENDING; + ax25_start_t2timer(ax25); + } + } + } else { + if (ax25->condition & AX25_COND_REJECT) { + if (pf) ax25_ds_enquiry_response(ax25); + } else { + ax25->condition |= AX25_COND_REJECT; + ax25_ds_enquiry_response(ax25); + ax25->condition &= ~AX25_COND_ACK_PENDING; + } + } + break; + + case AX25_FRMR: + case AX25_ILLEGAL: + ax25_ds_establish_data_link(ax25); + ax25->state = AX25_STATE_1; + break; + + default: + break; + } + + return queued; +} + +/* + * Higher level upcall for a LAPB frame + */ +int ax25_ds_frame_in(ax25_cb *ax25, struct sk_buff *skb, int type) +{ + int queued = 0, frametype, ns, nr, pf; + + frametype = ax25_decode(ax25, skb, &ns, &nr, &pf); + + switch (ax25->state) { + case AX25_STATE_1: + queued = ax25_ds_state1_machine(ax25, skb, frametype, pf, type); + break; + case AX25_STATE_2: + queued = ax25_ds_state2_machine(ax25, skb, frametype, pf, type); + break; + case AX25_STATE_3: + queued = ax25_ds_state3_machine(ax25, skb, frametype, ns, nr, pf, type); + break; + } + + return queued; +} + -- cgit 1.2.3-korg