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)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/module.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/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/ax25.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <net/sock.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) static DEFINE_SPINLOCK(ax25_frag_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) ax25_cb *ax25_send_frame(struct sk_buff *skb, int paclen, ax25_address *src, ax25_address *dest, ax25_digi *digi, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	ax25_dev *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	ax25_cb *ax25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	 * Take the default packet length for the device if zero is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	 * specified.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (paclen == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		paclen = ax25_dev->values[AX25_VALUES_PACLEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	 * Look for an existing connection.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if ((ax25 = ax25_find_cb(src, dest, digi, dev)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		ax25_output(ax25, paclen, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return ax25;		/* It already existed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if ((ax25 = ax25_create_cb()) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	ax25_fillin_cb(ax25, ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ax25->source_addr = *src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	ax25->dest_addr   = *dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (digi != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		ax25->digipeat = kmemdup(digi, sizeof(*digi), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		if (ax25->digipeat == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			ax25_cb_put(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		}
^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) 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	case AX25_PROTO_STD_SIMPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	case AX25_PROTO_STD_DUPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		ax25_std_establish_data_link(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) #ifdef CONFIG_AX25_DAMA_SLAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	case AX25_PROTO_DAMA_SLAVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		if (ax25_dev->dama.slave)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			ax25_ds_establish_data_link(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			ax25_std_establish_data_link(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * There is one ref for the state machine; a caller needs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * one more to put it back, just like with the existing one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	ax25_cb_hold(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	ax25_cb_add(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	ax25->state = AX25_STATE_1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	ax25_start_heartbeat(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	ax25_output(ax25, paclen, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	return ax25;			/* We had to create it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) EXPORT_SYMBOL(ax25_send_frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  *	All outgoing AX.25 I frames pass via this routine. Therefore this is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  *	where the fragmentation of frames takes place. If fragment is set to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  *	zero then we are not allowed to do fragmentation, even if the frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)  *	is too large.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	struct sk_buff *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	unsigned char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	int frontlen, len, fragno, ka9qfrag, first = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (paclen < 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if ((skb->len - 1) > paclen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		if (*skb->data == AX25_P_TEXT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			skb_pull(skb, 1); /* skip PID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			ka9qfrag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			paclen -= 2;	/* Allow for fragment control info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			ka9qfrag = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		fragno = skb->len / paclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		if (skb->len % paclen == 0) fragno--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		frontlen = skb_headroom(skb);	/* Address space + CTRL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		while (skb->len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			spin_lock_bh(&ax25_frag_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			if ((skbn = alloc_skb(paclen + 2 + frontlen, GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 				spin_unlock_bh(&ax25_frag_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 				printk(KERN_CRIT "AX.25: ax25_output - out of memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				return;
^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) 			if (skb->sk != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 				skb_set_owner_w(skbn, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			spin_unlock_bh(&ax25_frag_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			len = (paclen > skb->len) ? skb->len : paclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			if (ka9qfrag == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 				skb_reserve(skbn, frontlen + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 				skb_set_network_header(skbn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 						      skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				skb_copy_from_linear_data(skb, skb_put(skbn, len), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 				p = skb_push(skbn, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 				*p++ = AX25_P_SEGMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				*p = fragno--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 				if (first) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 					*p |= AX25_SEG_FIRST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 					first = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 				skb_reserve(skbn, frontlen + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				skb_set_network_header(skbn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 						      skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 				skb_copy_from_linear_data(skb, skb_put(skbn, len), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				p = skb_push(skbn, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				*p = AX25_P_TEXT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			skb_pull(skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			skb_queue_tail(&ax25->write_queue, skbn); /* Throw it on the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		skb_queue_tail(&ax25->write_queue, skb);	  /* Throw it on the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	case AX25_PROTO_STD_SIMPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	case AX25_PROTO_STD_DUPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		ax25_kick(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) #ifdef CONFIG_AX25_DAMA_SLAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	 * A DAMA slave is _required_ to work as normal AX.25L2V2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 * if no DAMA master is available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	case AX25_PROTO_DAMA_SLAVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (!ax25->ax25_dev->dama.slave) ax25_kick(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  *  This procedure is passed a buffer descriptor for an iframe. It builds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  *  the rest of the control part of the frame and then writes it out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static void ax25_send_iframe(ax25_cb *ax25, struct sk_buff *skb, int poll_bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	unsigned char *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (skb == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (ax25->modulus == AX25_MODULUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		frame = skb_push(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		*frame = AX25_I;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		*frame |= (poll_bit) ? AX25_PF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		*frame |= (ax25->vr << 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		*frame |= (ax25->vs << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		frame = skb_push(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		frame[0] = AX25_I;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		frame[0] |= (ax25->vs << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		frame[1] = (poll_bit) ? AX25_EPF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		frame[1] |= (ax25->vr << 1);
^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) 	ax25_start_idletimer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	ax25_transmit_buffer(ax25, skb, AX25_COMMAND);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) void ax25_kick(ax25_cb *ax25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct sk_buff *skb, *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	int last = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	unsigned short start, end, next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (ax25->state != AX25_STATE_3 && ax25->state != AX25_STATE_4)
^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->condition & AX25_COND_PEER_RX_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (skb_peek(&ax25->write_queue) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	start = (skb_peek(&ax25->ack_queue) == NULL) ? ax25->va : ax25->vs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	end   = (ax25->va + ax25->window) % ax25->modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (start == end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	 * Transmit data until either we're out of data to send or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	 * the window is full. Send a poll on the final I frame if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	 * the window is filled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	 * Dequeue the frame and copy it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	 * Check for race with ax25_clear_queues().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	skb  = skb_dequeue(&ax25->write_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	ax25->vs = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			skb_queue_head(&ax25->write_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		if (skb->sk != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			skb_set_owner_w(skbn, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		next = (ax25->vs + 1) % ax25->modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		last = (next == end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		 * Transmit the frame copy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		 * bke 960114: do not set the Poll bit on the last frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		 * in DAMA mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		case AX25_PROTO_STD_SIMPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		case AX25_PROTO_STD_DUPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			ax25_send_iframe(ax25, skbn, (last) ? AX25_POLLON : AX25_POLLOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) #ifdef CONFIG_AX25_DAMA_SLAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		case AX25_PROTO_DAMA_SLAVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			ax25_send_iframe(ax25, skbn, AX25_POLLOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		ax25->vs = next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		 * Requeue the original data frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		skb_queue_tail(&ax25->ack_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	} while (!last && (skb = skb_dequeue(&ax25->write_queue)) != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	ax25->condition &= ~AX25_COND_ACK_PENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	if (!ax25_t1timer_running(ax25)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		ax25_stop_t3timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		ax25_calculate_t1(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		ax25_start_t1timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) void ax25_transmit_buffer(ax25_cb *ax25, struct sk_buff *skb, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	struct sk_buff *skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	int headroom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (ax25->ax25_dev == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		ax25_disconnect(ax25, ENETUNREACH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	headroom = ax25_addr_size(ax25->digipeat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	if (skb_headroom(skb) < headroom) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		if ((skbn = skb_realloc_headroom(skb, headroom)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			printk(KERN_CRIT "AX.25: ax25_transmit_buffer - out of memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		if (skb->sk != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			skb_set_owner_w(skbn, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		skb = skbn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	ptr = skb_push(skb, headroom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	ax25_addr_build(ptr, &ax25->source_addr, &ax25->dest_addr, ax25->digipeat, type, ax25->modulus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	ax25_queue_xmit(skb, ax25->ax25_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)  *	A small shim to dev_queue_xmit to add the KISS control byte, and do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  *	any packet forwarding in operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	skb->protocol = ax25_type_trans(skb, ax25_fwd_dev(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	ptr  = skb_push(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	*ptr = 0x00;			/* KISS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	dev_queue_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) int ax25_check_iframes_acked(ax25_cb *ax25, unsigned short nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	if (ax25->vs == nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		ax25_frames_acked(ax25, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		ax25_calculate_rtt(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		ax25_stop_t1timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		ax25_start_t3timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		if (ax25->va != nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			ax25_frames_acked(ax25, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 			ax25_calculate_t1(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 			ax25_start_t1timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }