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) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
^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)  *	Given a fragment, queue it on the fragment queue and if the fragment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  *	is complete, send it back to ax25_rx_iframe.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int ax25_rx_fragment(ax25_cb *ax25, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct sk_buff *skbn, *skbo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (ax25->fragno != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		if (!(*skb->data & AX25_SEG_FIRST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 			if ((ax25->fragno - 1) == (*skb->data & AX25_SEG_REM)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 				/* Enqueue fragment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 				ax25->fragno = *skb->data & AX25_SEG_REM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 				skb_pull(skb, 1);	/* skip fragno */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 				ax25->fraglen += skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 				skb_queue_tail(&ax25->frag_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 				/* Last fragment received ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 				if (ax25->fragno == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 					skbn = alloc_skb(AX25_MAX_HEADER_LEN +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 							 ax25->fraglen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 							 GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 					if (!skbn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 						skb_queue_purge(&ax25->frag_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 						return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 					}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 					skb_reserve(skbn, AX25_MAX_HEADER_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 					skbn->dev   = ax25->ax25_dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 					skb_reset_network_header(skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 					skb_reset_transport_header(skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 					/* Copy data from the fragments */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 					while ((skbo = skb_dequeue(&ax25->frag_queue)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 						skb_copy_from_linear_data(skbo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 							  skb_put(skbn, skbo->len),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 									  skbo->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 						kfree_skb(skbo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 					}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 					ax25->fraglen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 					if (ax25_rx_iframe(ax25, skbn) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 						kfree_skb(skbn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		/* First fragment received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		if (*skb->data & AX25_SEG_FIRST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			skb_queue_purge(&ax25->frag_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			ax25->fragno = *skb->data & AX25_SEG_REM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			skb_pull(skb, 1);		/* skip fragno */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			ax25->fraglen = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			skb_queue_tail(&ax25->frag_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			return 1;
^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) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  *	This is where all valid I frames are sent to, to be dispatched to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  *	whichever protocol requires them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) int ax25_rx_iframe(ax25_cb *ax25, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	int (*func)(struct sk_buff *, ax25_cb *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	unsigned char pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	int queued = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (skb == NULL) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	ax25_start_idletimer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	pid = *skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (pid == AX25_P_IP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		/* working around a TCP bug to keep additional listeners
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		 * happy. TCP re-uses the buffer and destroys the original
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		 * content.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		struct sk_buff *skbn = skb_copy(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		if (skbn != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			skb = skbn;
^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) 		skb_pull(skb, 1);	/* Remove PID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		skb->mac_header = skb->network_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		skb->dev      = ax25->ax25_dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		skb->pkt_type = PACKET_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		skb->protocol = htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (pid == AX25_P_SEGMENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		skb_pull(skb, 1);	/* Remove PID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		return ax25_rx_fragment(ax25, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if ((func = ax25_protocol_function(pid)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		skb_pull(skb, 1);	/* Remove PID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		return (*func)(skb, ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (ax25->sk != NULL && ax25->ax25_dev->values[AX25_VALUES_CONMODE] == 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		if ((!ax25->pidincl && ax25->sk->sk_protocol == pid) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		    ax25->pidincl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			if (sock_queue_rcv_skb(ax25->sk, skb) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 				queued = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				ax25->condition |= AX25_COND_OWN_RX_BUSY;
^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) 	return queued;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  *	Higher level upcall for a LAPB frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int ax25_process_rx_frame(ax25_cb *ax25, struct sk_buff *skb, int type, int dama)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	int queued = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (ax25->state == AX25_STATE_0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	case AX25_PROTO_STD_SIMPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	case AX25_PROTO_STD_DUPLEX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		queued = ax25_std_frame_in(ax25, skb, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) #ifdef CONFIG_AX25_DAMA_SLAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	case AX25_PROTO_DAMA_SLAVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		if (dama || ax25->ax25_dev->dama.slave)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			queued = ax25_ds_frame_in(ax25, skb, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			queued = ax25_std_frame_in(ax25, skb, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) #endif
^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) 	return queued;
^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) static int ax25_rcv(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	ax25_address *dev_addr, struct packet_type *ptype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	ax25_address src, dest, *next_digi = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	int type = 0, mine = 0, dama;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	struct sock *make, *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	ax25_digi dp, reverse_dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	ax25_cb *ax25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	ax25_dev *ax25_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	 *	Process the AX.25/LAPB frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 *	Parse the address header.
^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) 	if (ax25_addr_parse(skb->data, skb->len, &src, &dest, &dp, &type, &dama) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	 *	Ours perhaps ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (dp.lastrepeat + 1 < dp.ndigi)		/* Not yet digipeated completely */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		next_digi = &dp.calls[dp.lastrepeat + 1];
^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) 	 *	Pull of the AX.25 headers leaving the CTRL/PID bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	skb_pull(skb, ax25_addr_size(&dp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	/* For our port addresses ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (ax25cmp(&dest, dev_addr) == 0 && dp.lastrepeat + 1 == dp.ndigi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		mine = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	/* Also match on any registered callsign from L3/4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (!mine && ax25_listen_mine(&dest, dev) && dp.lastrepeat + 1 == dp.ndigi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		mine = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/* UI frame - bypass LAPB processing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if ((*skb->data & ~0x10) == AX25_UI && dp.lastrepeat + 1 == dp.ndigi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		skb_set_transport_header(skb, 2); /* skip control and pid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		ax25_send_to_raw(&dest, skb, skb->data[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		if (!mine && ax25cmp(&dest, (ax25_address *)dev->broadcast) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		/* Now we are pointing at the pid byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		switch (skb->data[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		case AX25_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			skb_pull(skb,2);		/* drop PID/CTRL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			skb->dev      = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			skb->pkt_type = PACKET_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			skb->protocol = htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		case AX25_P_ARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			skb_pull(skb,2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			skb->dev      = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			skb->pkt_type = PACKET_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 			skb->protocol = htons(ETH_P_ARP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		case AX25_P_TEXT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			/* Now find a suitable dgram socket */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			sk = ax25_get_socket(&dest, &src, SOCK_DGRAM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			if (sk != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 				bh_lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 				if (atomic_read(&sk->sk_rmem_alloc) >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 				    sk->sk_rcvbuf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 					kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 				} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 					/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 					 *	Remove the control and PID.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 					 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 					skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 					if (sock_queue_rcv_skb(sk, skb) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 						kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 				bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 				sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 				kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			kfree_skb(skb);	/* Will scan SOCK_AX25 RAW sockets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	 *	Is connected mode supported on this device ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	 *	If not, should we DM the incoming frame (except DMs) or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	 *	silently ignore them. For now we stay quiet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	if (ax25_dev->values[AX25_VALUES_CONMODE] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	/* LAPB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	/* AX.25 state 1-4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	ax25_digi_invert(&dp, &reverse_dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if ((ax25 = ax25_find_cb(&dest, &src, &reverse_dp, dev)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		 *	Process the frame. If it is queued up internally it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		 *	returns one otherwise we free it immediately. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		 *	routine itself wakes the user context layers so we do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		 *	no further work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		if (ax25_process_rx_frame(ax25, skb, type, dama) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		ax25_cb_put(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	/* AX.25 state 0 (disconnected) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	/* a) received not a SABM(E) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if ((*skb->data & ~AX25_PF) != AX25_SABM &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	    (*skb->data & ~AX25_PF) != AX25_SABME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		 *	Never reply to a DM. Also ignore any connects for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		 *	addresses that are not our interfaces and not a socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		if ((*skb->data & ~AX25_PF) != AX25_DM && mine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 			ax25_return_dm(dev, &src, &dest, &dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	/* b) received SABM(E) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	if (dp.lastrepeat + 1 == dp.ndigi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		sk = ax25_find_listener(&dest, 0, dev, SOCK_SEQPACKET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		sk = ax25_find_listener(next_digi, 1, dev, SOCK_SEQPACKET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (sk != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		bh_lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		if (sk_acceptq_is_full(sk) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		    (make = ax25_make_new(sk, ax25_dev)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 			if (mine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 				ax25_return_dm(dev, &src, &dest, &dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			return 0;
^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) 		ax25 = sk_to_ax25(make);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		skb_set_owner_r(skb, make);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		skb_queue_head(&sk->sk_receive_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		make->sk_state = TCP_ESTABLISHED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		sk_acceptq_added(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		if (!mine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 			goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		if ((ax25 = ax25_create_cb()) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			ax25_return_dm(dev, &src, &dest, &dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 			goto free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		ax25_fillin_cb(ax25, ax25_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	ax25->source_addr = dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	ax25->dest_addr   = src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	 *	Sort out any digipeated paths.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	if (dp.ndigi && !ax25->digipeat &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	    (ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		ax25_destroy_socket(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		if (sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 			sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	if (dp.ndigi == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		kfree(ax25->digipeat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		ax25->digipeat = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		/* Reverse the source SABM's path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		memcpy(ax25->digipeat, &reverse_dp, sizeof(ax25_digi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	if ((*skb->data & ~AX25_PF) == AX25_SABME) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		ax25->modulus = AX25_EMODULUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		ax25->window  = ax25_dev->values[AX25_VALUES_EWINDOW];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		ax25->modulus = AX25_MODULUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		ax25->window  = ax25_dev->values[AX25_VALUES_WINDOW];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	ax25_send_control(ax25, AX25_UA, AX25_POLLON, AX25_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) #ifdef CONFIG_AX25_DAMA_SLAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (dama && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		ax25_dama_on(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	ax25->state = AX25_STATE_3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	ax25_cb_add(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	ax25_start_heartbeat(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	ax25_start_t3timer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	ax25_start_idletimer(ax25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	if (sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 			sk->sk_data_ready(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)  *	Receive an AX.25 frame via a SLIP interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) int ax25_kiss_rcv(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		  struct packet_type *ptype, struct net_device *orig_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	skb_orphan(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	if (!net_eq(dev_net(dev), &init_net)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	if ((*skb->data & 0x0F) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		kfree_skb(skb);	/* Not a KISS data frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	skb_pull(skb, AX25_KISS_HEADER_LEN);	/* Remove the KISS byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	return ax25_rcv(skb, dev, (ax25_address *)dev->dev_addr, ptype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }