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 (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <net/tcp_states.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *	This routine purges all the queues of frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) void ax25_clear_queues(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	skb_queue_purge(&ax25->write_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	skb_queue_purge(&ax25->ack_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	skb_queue_purge(&ax25->reseq_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	skb_queue_purge(&ax25->frag_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * This routine purges the input queue of those frames that have been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * SDL diagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) void ax25_frames_acked(ax25_cb *ax25, unsigned short nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	 * Remove all the ack-ed frames from the ack queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	if (ax25->va != nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		while (skb_peek(&ax25->ack_queue) != NULL && ax25->va != nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			skb = skb_dequeue(&ax25->ack_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 			ax25->va = (ax25->va + 1) % ax25->modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) void ax25_requeue_frames(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	struct sk_buff *skb;
^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) 	 * Requeue all the un-ack-ed frames on the output queue to be picked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	 * up by ax25_kick called from the timer. This arrangement handles the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	 * possibility of an empty output queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	while ((skb = skb_dequeue_tail(&ax25->ack_queue)) != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		skb_queue_head(&ax25->write_queue, skb);
^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)  *	Validate that the value of nr is between va and vs. Return true or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  *	false for testing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) int ax25_validate_nr(ax25_cb *ax25, unsigned short nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	unsigned short vc = ax25->va;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	while (vc != ax25->vs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		if (nr == vc) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		vc = (vc + 1) % ax25->modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (nr == ax25->vs) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  *	This routine is the centralised routine for parsing the control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  *	information for the different frame formats.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) int ax25_decode(ax25_cb *ax25, struct sk_buff *skb, int *ns, int *nr, int *pf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	unsigned char *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int frametype = AX25_ILLEGAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	frame = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	*ns = *nr = *pf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (ax25->modulus == AX25_MODULUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		if ((frame[0] & AX25_S) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			frametype = AX25_I;			/* I frame - carries NR/NS/PF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			*ns = (frame[0] >> 1) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			*nr = (frame[0] >> 5) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			*pf = frame[0] & AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		} else if ((frame[0] & AX25_U) == 1) { 	/* S frame - take out PF/NR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			frametype = frame[0] & 0x0F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			*nr = (frame[0] >> 5) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			*pf = frame[0] & AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		} else if ((frame[0] & AX25_U) == 3) { 	/* U frame - take out PF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			frametype = frame[0] & ~AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			*pf = frame[0] & AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		if ((frame[0] & AX25_S) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			frametype = AX25_I;			/* I frame - carries NR/NS/PF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			*ns = (frame[0] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			*nr = (frame[1] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			*pf = frame[1] & AX25_EPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		} else if ((frame[0] & AX25_U) == 1) { 	/* S frame - take out PF/NR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			frametype = frame[0] & 0x0F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			*nr = (frame[1] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			*pf = frame[1] & AX25_EPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		} else if ((frame[0] & AX25_U) == 3) { 	/* U frame - take out PF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			frametype = frame[0] & ~AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			*pf = frame[0] & AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	return frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  *	This routine is called when the HDLC layer internally  generates a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  *	command or  response  for  the remote machine ( eg. RR, UA etc. ).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  *	Only supervisory or unnumbered frames are processed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void ax25_send_control(ax25_cb *ax25, int frametype, int poll_bit, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	unsigned char  *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if ((skb = alloc_skb(ax25->ax25_dev->dev->hard_header_len + 2, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	skb_reserve(skb, ax25->ax25_dev->dev->hard_header_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* Assume a response - address structure for DTE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (ax25->modulus == AX25_MODULUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		dptr = skb_put(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		*dptr = frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		*dptr |= (poll_bit) ? AX25_PF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		if ((frametype & AX25_U) == AX25_S)		/* S frames carry NR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			*dptr |= (ax25->vr << 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		if ((frametype & AX25_U) == AX25_U) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			dptr = skb_put(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			*dptr = frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			*dptr |= (poll_bit) ? AX25_PF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			dptr = skb_put(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			dptr[0] = frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			dptr[1] = (ax25->vr << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			dptr[1] |= (poll_bit) ? AX25_EPF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	ax25_transmit_buffer(ax25, skb, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  *	Send a 'DM' to an unknown connection attempt, or an invalid caller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  *	Note: src here is the sender, thus it's the target of the DM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) void ax25_return_dm(struct net_device *dev, ax25_address *src, ax25_address *dest, ax25_digi *digi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	ax25_digi retdigi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (dev == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	if ((skb = alloc_skb(dev->hard_header_len + 1, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		return;	/* Next SABM will get DM'd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	skb_reserve(skb, dev->hard_header_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	ax25_digi_invert(digi, &retdigi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	dptr = skb_put(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	*dptr = AX25_DM | AX25_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	 *	Do the address ourselves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	dptr  = skb_push(skb, ax25_addr_size(digi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	dptr += ax25_addr_build(dptr, dest, src, &retdigi, AX25_RESPONSE, AX25_MODULUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	ax25_queue_xmit(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  *	Exponential backoff for AX.25
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) void ax25_calculate_t1(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	int n, t = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	switch (ax25->backoff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		t += 2 * ax25->n2count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		for (n = 0; n < ax25->n2count; n++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			t *= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		if (t > 8) t = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	ax25->t1 = t * ax25->rtt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  *	Calculate the Round Trip Time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) void ax25_calculate_rtt(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (ax25->backoff == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (ax25_t1timer_running(ax25) && ax25->n2count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		ax25->rtt = (9 * ax25->rtt + ax25->t1 - ax25_display_timer(&ax25->t1timer)) / 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (ax25->rtt < AX25_T1CLAMPLO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		ax25->rtt = AX25_T1CLAMPLO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (ax25->rtt > AX25_T1CLAMPHI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		ax25->rtt = AX25_T1CLAMPHI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) void ax25_disconnect(ax25_cb *ax25, int reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	ax25_clear_queues(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (!ax25->sk || !sock_flag(ax25->sk, SOCK_DESTROY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		ax25_stop_heartbeat(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	ax25_stop_t1timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	ax25_stop_t2timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	ax25_stop_t3timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	ax25_stop_idletimer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	ax25->state = AX25_STATE_0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	ax25_link_failed(ax25, reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (ax25->sk != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		local_bh_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		bh_lock_sock(ax25->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		ax25->sk->sk_state     = TCP_CLOSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		ax25->sk->sk_err       = reason;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			ax25->sk->sk_state_change(ax25->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			sock_set_flag(ax25->sk, SOCK_DEAD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		bh_unlock_sock(ax25->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }