Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <net/netrom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *	This is where all NET/ROM frames pass, except for IP-over-NET/ROM which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *	cannot be fragmented in this manner.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) void nr_output(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct sk_buff *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	unsigned char transport[NR_TRANSPORT_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	int err, frontlen, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (skb->len - NR_TRANSPORT_LEN > NR_MAX_PACKET_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		/* Save a copy of the Transport Header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		skb_copy_from_linear_data(skb, transport, NR_TRANSPORT_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		skb_pull(skb, NR_TRANSPORT_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		frontlen = skb_headroom(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		while (skb->len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			if ((skbn = sock_alloc_send_skb(sk, frontlen + NR_MAX_PACKET_SIZE, 0, &err)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 				return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			skb_reserve(skbn, frontlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			len = (NR_MAX_PACKET_SIZE > skb->len) ? skb->len : NR_MAX_PACKET_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			/* Copy the user data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			skb_copy_from_linear_data(skb, skb_put(skbn, len), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			skb_pull(skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 			/* Duplicate the Transport Header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			skb_push(skbn, NR_TRANSPORT_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			skb_copy_to_linear_data(skbn, transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 						NR_TRANSPORT_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			if (skb->len > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 				skbn->data[4] |= NR_MORE_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			skb_queue_tail(&sk->sk_write_queue, skbn); /* Throw it on the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		skb_queue_tail(&sk->sk_write_queue, skb);		/* Throw it on the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	nr_kick(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  *	This procedure is passed a buffer descriptor for an iframe. It builds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  *	the rest of the control part of the frame and then writes it out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static void nr_send_iframe(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	struct nr_sock *nr = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (skb == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	skb->data[2] = nr->vs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	skb->data[3] = nr->vr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (nr->condition & NR_COND_OWN_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		skb->data[4] |= NR_CHOKE_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	nr_start_idletimer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	nr_transmit_buffer(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) void nr_send_nak_frame(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct sk_buff *skb, *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct nr_sock *nr = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if ((skb = skb_peek(&nr->ack_queue)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	skbn->data[2] = nr->va;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	skbn->data[3] = nr->vr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (nr->condition & NR_COND_OWN_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		skbn->data[4] |= NR_CHOKE_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	nr_transmit_buffer(sk, skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	nr->condition &= ~NR_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	nr->vl         = nr->vr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	nr_stop_t1timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void nr_kick(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	struct nr_sock *nr = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct sk_buff *skb, *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	unsigned short start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (nr->state != NR_STATE_3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (nr->condition & NR_COND_PEER_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (!skb_peek(&sk->sk_write_queue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	start = (skb_peek(&nr->ack_queue) == NULL) ? nr->va : nr->vs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	end   = (nr->va + nr->window) % NR_MODULUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	if (start == end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	nr->vs = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	 * Transmit data until either we're out of data to send or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 * the window is full.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	 * Dequeue the frame and copy it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	skb = skb_dequeue(&sk->sk_write_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			skb_queue_head(&sk->sk_write_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		skb_set_owner_w(skbn, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		 * Transmit the frame copy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		nr_send_iframe(sk, skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		nr->vs = (nr->vs + 1) % NR_MODULUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		 * Requeue the original data frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		skb_queue_tail(&nr->ack_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	} while (nr->vs != end &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		 (skb = skb_dequeue(&sk->sk_write_queue)) != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	nr->vl         = nr->vr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	nr->condition &= ~NR_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (!nr_t1timer_running(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		nr_start_t1timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) void nr_transmit_buffer(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	struct nr_sock *nr = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	unsigned char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	 *	Add the protocol byte and network header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	dptr = skb_push(skb, NR_NETWORK_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	memcpy(dptr, &nr->source_addr, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	dptr[6] &= ~AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	dptr[6] &= ~AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	dptr[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	dptr += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	memcpy(dptr, &nr->dest_addr, AX25_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	dptr[6] &= ~AX25_CBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	dptr[6] |= AX25_EBIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	dptr[6] |= AX25_SSSID_SPARE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	dptr += AX25_ADDR_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	*dptr++ = sysctl_netrom_network_ttl_initialiser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (!nr_route_frame(skb, NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		nr_disconnect(sk, ENETUNREACH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)  * The following routines are taken from page 170 of the 7th ARRL Computer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * Networking Conference paper, as is the whole state machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) void nr_establish_data_link(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	struct nr_sock *nr = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	nr->condition = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	nr->n2count   = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	nr_write_internal(sk, NR_CONNREQ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	nr_stop_t2timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	nr_stop_t4timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	nr_stop_idletimer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	nr_start_t1timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  * Never send a NAK when we are CHOKEd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) void nr_enquiry_response(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct nr_sock *nr = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	int frametype = NR_INFOACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (nr->condition & NR_COND_OWN_RX_BUSY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		frametype |= NR_CHOKE_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		if (skb_peek(&nr->reseq_queue) != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			frametype |= NR_NAK_FLAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	nr_write_internal(sk, frametype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	nr->vl         = nr->vr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	nr->condition &= ~NR_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) void nr_check_iframes_acked(struct sock *sk, unsigned short nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct nr_sock *nrom = nr_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (nrom->vs == nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		nr_frames_acked(sk, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		nr_stop_t1timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		nrom->n2count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		if (nrom->va != nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			nr_frames_acked(sk, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			nr_start_t1timer(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }