Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Generic HDLC support routines for Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * X.25 support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^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/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/hdlc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/inetdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/lapb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/pkt_sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <net/x25device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct x25_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	x25_hdlc_proto settings;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	bool up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	spinlock_t up_lock; /* Protects "up" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static struct x25_state *state(hdlc_device *hdlc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	return hdlc->state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) /* These functions are callbacks called by LAPB layer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if ((skb = dev_alloc_skb(1)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		netdev_err(dev, "out of memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		return;
^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) 	ptr = skb_put(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	*ptr = code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	skb->protocol = x25_type_trans(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	netif_rx(skb);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static void x25_connected(struct net_device *dev, int reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static void x25_disconnected(struct net_device *dev, int reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (skb_cow(skb, 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	skb_push(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	ptr  = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	*ptr = X25_IFACE_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	skb->protocol = x25_type_trans(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	return netif_rx(skb);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	skb->protocol = hdlc_type_trans(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (dev_nit_active(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		dev_queue_xmit_nit(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	hdlc->xmit(skb, dev); /* Ignore return value :-( */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^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) static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	struct x25_state *x25st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	/* There should be a pseudo header of 1 byte added by upper layers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	 * Check to make sure it is there before reading it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (skb->len < 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return NETDEV_TX_OK;
^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) 	spin_lock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (!x25st->up) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	switch (skb->data[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	case X25_IFACE_DATA:	/* Data to be transmitted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			dev_kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	case X25_IFACE_CONNECT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		if ((result = lapb_connect_request(dev))!= LAPB_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			if (result == LAPB_CONNECTED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 				/* Send connect confirm. msg to level 3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 				x25_connected(dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 				netdev_err(dev, "LAPB connect request failed, error code = %i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 					   result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	case X25_IFACE_DISCONNECT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			if (result == LAPB_NOTCONNECTED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 				/* Send disconnect confirm. msg to level 3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				x25_disconnected(dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				netdev_err(dev, "LAPB disconnect request failed, error code = %i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 					   result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		}
^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) 	default:		/* to be defined */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		break;
^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) 	spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	dev_kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	return NETDEV_TX_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^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) static int x25_open(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	static const struct lapb_register_struct cb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		.connect_confirmation = x25_connected,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		.connect_indication = x25_connected,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		.disconnect_confirmation = x25_disconnected,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		.disconnect_indication = x25_disconnected,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		.data_indication = x25_data_indication,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		.data_transmit = x25_data_transmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct x25_state *x25st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	struct lapb_parms_struct params;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	result = lapb_register(dev, &cb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (result != LAPB_OK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	result = lapb_getparms(dev, &params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (result != LAPB_OK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (state(hdlc)->settings.dce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		params.mode = params.mode | LAPB_DCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (state(hdlc)->settings.modulo == 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		params.mode = params.mode | LAPB_EXTENDED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	params.window = state(hdlc)->settings.window;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	params.t1 = state(hdlc)->settings.t1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	params.t2 = state(hdlc)->settings.t2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	params.n2 = state(hdlc)->settings.n2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	result = lapb_setparms(dev, &params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (result != LAPB_OK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	spin_lock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	x25st->up = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return 0;
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static void x25_close(struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	struct x25_state *x25st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	spin_lock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	x25st->up = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	lapb_unregister(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int x25_rx(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	struct net_device *dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	struct x25_state *x25st = state(hdlc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		return NET_RX_DROP;
^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) 	spin_lock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (!x25st->up) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (lapb_data_received(dev, skb) == LAPB_OK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		return NET_RX_SUCCESS;
^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) 	spin_unlock_bh(&x25st->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^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) static struct hdlc_proto proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	.open		= x25_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	.close		= x25_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	.ioctl		= x25_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	.netif_rx	= x25_rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	.xmit		= x25_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	.module		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	x25_hdlc_proto __user *x25_s = ifr->ifr_settings.ifs_ifsu.x25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	const size_t size = sizeof(x25_hdlc_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	hdlc_device *hdlc = dev_to_hdlc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	x25_hdlc_proto new_settings;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	switch (ifr->ifr_settings.type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	case IF_GET_PROTO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		if (dev_to_hdlc(dev)->proto != &proto)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		ifr->ifr_settings.type = IF_PROTO_X25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		if (ifr->ifr_settings.size < size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			ifr->ifr_settings.size = size; /* data size wanted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		if (copy_to_user(x25_s, &state(hdlc)->settings, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	case IF_PROTO_X25:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		if (!capable(CAP_NET_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		if (dev->flags & IFF_UP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		/* backward compatibility */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		if (ifr->ifr_settings.size == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			new_settings.dce = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			new_settings.modulo = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			new_settings.window = 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			new_settings.t1 = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			new_settings.t2 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			new_settings.n2 = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			if (copy_from_user(&new_settings, x25_s, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 				return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 			if ((new_settings.dce != 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 			new_settings.dce != 1) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 			(new_settings.modulo != 8 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			new_settings.modulo != 128) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			new_settings.window < 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			(new_settings.modulo == 8 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 			new_settings.window > 7) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			(new_settings.modulo == 128 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			new_settings.window > 127) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			new_settings.t1 < 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 			new_settings.t1 > 255 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			new_settings.t2 < 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 			new_settings.t2 > 255 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 			new_settings.n2 < 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 			new_settings.n2 > 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 				return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		if ((result = attach_hdlc_protocol(dev, &proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 						   sizeof(struct x25_state))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		memcpy(&state(hdlc)->settings, &new_settings, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		state(hdlc)->up = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		spin_lock_init(&state(hdlc)->up_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		/* There's no header_ops so hard_header_len should be 0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		dev->hard_header_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		/* When transmitting data:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		 * first we'll remove a pseudo header of 1 byte,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		 * then we'll prepend an LAPB header of at most 3 bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		dev->needed_headroom = 3 - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		dev->type = ARPHRD_X25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		netif_dormant_off(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	return -EINVAL;
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static int __init mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	register_hdlc_protocol(&proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^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) static void __exit mod_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	unregister_hdlc_protocol(&proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^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) module_init(mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) module_exit(mod_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) MODULE_LICENSE("GPL v2");