hdlc_fr.c

linux-2.6.15.6

static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	pvc_device *pvc;
	u8 rxseq, txseq;
	int lmi = hdlc->state.fr.settings.lmi;
	int dce = hdlc->state.fr.settings.dce;
	int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;

	if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
			LMI_CCITT_CISCO_LENGTH)) {
		printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
		return 1;
	}

	if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
			     NLPID_CCITT_ANSI_LMI)) {
		printk(KERN_INFO "%s: Received non-LMI frame with LMI"
		       " DLCI\n", dev->name);
		return 1;
	}

	if (skb->data[4] != LMI_CALLREF) {
		printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
		       dev->name, skb->data[4]);
		return 1;
	}

	if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
		printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
		       dev->name, skb->data[5]);
		return 1;
	}

	if (lmi == LMI_ANSI) {
		if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
			printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
			       " message (0x%02X)\n", dev->name, skb->data[6]);
			return 1;
		}
		i = 7;
	} else
		i = 6;

	if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
			     LMI_ANSI_CISCO_REPTYPE)) {
		printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
		       dev->name, skb->data[i]);
		return 1;
	}

	if (skb->data[++i] != LMI_REPT_LEN) {
		printk(KERN_INFO "%s: Invalid LMI Report type IE length"
		       " (%u)\n", dev->name, skb->data[i]);
		return 1;
	}

	reptype = skb->data[++i];
	if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
		printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
		       dev->name, reptype);
		return 1;
	}

	if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
			       LMI_ANSI_CISCO_ALIVE)) {
		printk(KERN_INFO "%s: Not an LMI Link integrity verification"
		       " IE (0x%02X)\n", dev->name, skb->data[i]);
		return 1;
	}

	if (skb->data[++i] != LMI_INTEG_LEN) {
		printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
		       " IE length (%u)\n", dev->name, skb->data[i]);
		return 1;
	}
	i++;

	hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
	rxseq = skb->data[i++];	/* Should confirm our sequence */

	txseq = hdlc->state.fr.txseq;

	if (dce)
		hdlc->state.fr.last_poll = jiffies;

	error = 0;
	if (!hdlc->state.fr.reliable)
		error = 1;

	if (rxseq == 0 || rxseq != txseq) {
		hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
		error = 1;
	}

	if (dce) {
		if (hdlc->state.fr.fullrep_sent && !error) {
/* Stop sending full report - the last one has been confirmed by DTE */
			hdlc->state.fr.fullrep_sent = 0;
			pvc = hdlc->state.fr.first_pvc;
			while (pvc) {
				if (pvc->state.new) {
					pvc->state.new = 0;

/* Tell DTE that new PVC is now active */
					hdlc->state.fr.dce_changed = 1;
				}
				pvc = pvc->next;
			}
		}

		if (hdlc->state.fr.dce_changed) {
			reptype = LMI_FULLREP;
			hdlc->state.fr.fullrep_sent = 1;
			hdlc->state.fr.dce_changed = 0;
		}

		hdlc->state.fr.request = 1; /* got request */
		fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
		return 0;
	}

	/* DTE */

	hdlc->state.fr.request = 0; /* got response, no request pending */

	if (error)
		return 0;

	if (reptype != LMI_FULLREP)
		return 0;

	pvc = hdlc->state.fr.first_pvc;

	while (pvc) {
		pvc->state.deleted = 1;
		pvc = pvc->next;
	}

	no_ram = 0;
	while (skb->len >= i + 2 + stat_len) {
		u16 dlci;
		u32 bw;
		unsigned int active, new;

		if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
				       LMI_ANSI_CISCO_PVCSTAT)) {
			printk(KERN_INFO "%s: Not an LMI PVC status IE"
			       " (0x%02X)\n", dev->name, skb->data[i]);
			return 1;
		}

		if (skb->data[++i] != stat_len) {
			printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
			       " (%u)\n", dev->name, skb->data[i]);
			return 1;
		}
		i++;

		new = !! (skb->data[i + 2] & 0x08);
		active = !! (skb->data[i + 2] & 0x02);
		if (lmi == LMI_CISCO) {
			dlci = (skb->data[i] << 8) | skb->data[i + 1];
			bw = (skb->data[i + 3] << 16) |
				(skb->data[i + 4] << 8) |
				(skb->data[i + 5]);
		} else {
			dlci = ((skb->data[i] & 0x3F) << 4) |
				((skb->data[i + 1] & 0x78) >> 3);
			bw = 0;
		}

		pvc = add_pvc(dev, dlci);

		if (!pvc && !no_ram) {
			printk(KERN_WARNING
			       "%s: Memory squeeze on fr_lmi_recv()\n",
			       dev->name);
			no_ram = 1;
		}

		if (pvc) {
			pvc->state.exist = 1;
			pvc->state.deleted = 0;
			if (active != pvc->state.active ||
			    new != pvc->state.new ||
			    bw != pvc->state.bandwidth ||
			    !pvc->state.exist) {
				pvc->state.new = new;
				pvc->state.active = active;
				pvc->state.bandwidth = bw;
				pvc_carrier(active, pvc);
				fr_log_dlci_active(pvc);
			}
		}

		i += stat_len;
	}

	pvc = hdlc->state.fr.first_pvc;

	while (pvc) {
		if (pvc->state.deleted && pvc->state.exist) {
			pvc_carrier(0, pvc);
			pvc->state.active = pvc->state.new = 0;
			pvc->state.exist = 0;
			pvc->state.bandwidth = 0;
			fr_log_dlci_active(pvc);
		}
		pvc = pvc->next;
	}

	/* Next full report after N391 polls */
	hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;

	return 0;
}



static int fr_rx(struct sk_buff *skb)
{
	struct net_device *ndev = skb->dev;
	hdlc_device *hdlc = dev_to_hdlc(ndev);
	fr_hdr *fh = (fr_hdr*)skb->data;
	u8 *data = skb->data;
	u16 dlci;
	pvc_device *pvc;
	struct net_device *dev = NULL;

	if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
		goto rx_error;

	dlci = q922_to_dlci(skb->data);

	if ((dlci == LMI_CCITT_ANSI_DLCI &&
	     (hdlc->state.fr.settings.lmi == LMI_ANSI ||
	      hdlc->state.fr.settings.lmi == LMI_CCITT)) ||
	    (dlci == LMI_CISCO_DLCI &&
	     hdlc->state.fr.settings.lmi == LMI_CISCO)) {
		if (fr_lmi_recv(ndev, skb))
			goto rx_error;
		dev_kfree_skb_any(skb);
		return NET_RX_SUCCESS;
	}

	pvc = find_pvc(hdlc, dlci);
	if (!pvc) {
#ifdef DEBUG_PKT
		printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
		       ndev->name, dlci);
#endif
		dev_kfree_skb_any(skb);
		return NET_RX_DROP;
	}

	if (pvc->state.fecn != fh->fecn) {
#ifdef DEBUG_ECN
		printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", ndev->name,
		       dlci, fh->fecn ? "N" : "FF");
#endif
		pvc->state.fecn ^= 1;
	}

	if (pvc->state.becn != fh->becn) {
#ifdef DEBUG_ECN
		printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", ndev->name,
		       dlci, fh->becn ? "N" : "FF");
#endif
		pvc->state.becn ^= 1;
	}


	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
		hdlc->stats.rx_dropped++;
		return NET_RX_DROP;
	}

	if (data[3] == NLPID_IP) {
		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
		dev = pvc->main;
		skb->protocol = htons(ETH_P_IP);

	} else if (data[3] == NLPID_IPV6) {
		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
		dev = pvc->main;
		skb->protocol = htons(ETH_P_IPV6);

	} else if (skb->len > 10 && data[3] == FR_PAD &&
		   data[4] == NLPID_SNAP && data[5] == FR_PAD) {
		u16 oui = ntohs(*(u16*)(data + 6));
		u16 pid = ntohs(*(u16*)(data + 8));
		skb_pull(skb, 10);

		switch ((((u32)oui) << 16) | pid) {
		case ETH_P_ARP: /* routed frame with SNAP */
		case ETH_P_IPX:
		case ETH_P_IP:	/* a long variant */
		case ETH_P_IPV6:
			dev = pvc->main;
			skb->protocol = htons(pid);
			break;

		case 0x80C20007: /* bridged Ethernet frame */
			if ((dev = pvc->ether) != NULL)
				skb->protocol = eth_type_trans(skb, dev);
			break;

		default:
			printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
			       "PID=%x\n", ndev->name, oui, pid);
			dev_kfree_skb_any(skb);
			return NET_RX_DROP;
		}
	} else {
		printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
		       "length = %i\n", ndev->name, data[3], skb->len);
		dev_kfree_skb_any(skb);
		return NET_RX_DROP;
	}

	if (dev) {
		struct net_device_stats *stats = pvc_get_stats(dev);
		stats->rx_packets++; /* PVC traffic */
		stats->rx_bytes += skb->len;
		if (pvc->state.becn)
			stats->rx_compressed++;
		skb->dev = dev;
		netif_rx(skb);
		return NET_RX_SUCCESS;
	} else {
		dev_kfree_skb_any(skb);
		return NET_RX_DROP;
	}

 rx_error:
	hdlc->stats.rx_errors++; /* Mark error */
	dev_kfree_skb_any(skb);
	return NET_RX_DROP;
}



static void fr_start(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
#ifdef DEBUG_LINK
	printk(KERN_DEBUG "fr_start\n");
#endif
	if (hdlc->state.fr.settings.lmi != LMI_NONE) {
		hdlc->state.fr.reliable = 0;
		hdlc->state.fr.dce_changed = 1;
		hdlc->state.fr.request = 0;
		hdlc->state.fr.fullrep_sent = 0;
		hdlc->state.fr.last_errors = 0xFFFFFFFF;
		hdlc->state.fr.n391cnt = 0;
		hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;

		init_timer(&hdlc->state.fr.timer);
		/* First poll after 1 s */
		hdlc->state.fr.timer.expires = jiffies + HZ;
		hdlc->state.fr.timer.function = fr_timer;
		hdlc->state.fr.timer.data = (unsigned long)dev;
		add_timer(&hdlc->state.fr.timer);
	} else
		fr_set_link_state(1, dev);
}



static void fr_stop(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
#ifdef DEBUG_LINK
	printk(KERN_DEBUG "fr_stop\n");
#endif
	if (hdlc->state.fr.settings.lmi != LMI_NONE)
		del_timer_sync(&hdlc->state.fr.timer);
	fr_set_link_state(0, dev);
}



static void fr_close(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	pvc_device *pvc = hdlc->state.fr.first_pvc;

	while (pvc) {		/* Shutdown all PVCs for this FRAD */
		if (pvc->main)
			dev_close(pvc->main);
		if (pvc->ether)
			dev_close(pvc->ether);
		pvc = pvc->next;
	}
}

static void dlci_setup(struct net_device *dev)
{
	dev->type = ARPHRD_DLCI;
	dev->flags = IFF_POINTOPOINT;
	dev->hard_header_len = 10;
	dev->addr_len = 2;
}

static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
{
	hdlc_device *hdlc = dev_to_hdlc(master);
	pvc_device *pvc = NULL;
	struct net_device *dev;
	int result, used;
	char * prefix = "pvc%d";

	if (type == ARPHRD_ETHER)
		prefix = "pvceth%d";

	if ((pvc = add_pvc(master, dlci)) == NULL) {
		printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
		       master->name);
		return -ENOBUFS;
	}

	if (*get_dev_p(pvc, type))
		return -EEXIST;

	used = pvc_is_used(pvc);

	if (type == ARPHRD_ETHER)
		dev = alloc_netdev(sizeof(struct net_device_stats),
				   "pvceth%d", ether_setup);
	else
		dev = alloc_netdev(sizeof(struct net_device_stats),
				   "pvc%d", dlci_setup);

	if (!dev) {
		printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
		       master->name);
		delete_unused_pvcs(hdlc);
		return -ENOBUFS;
	}

	if (type == ARPHRD_ETHER) {
		memcpy(dev->dev_addr, "\x00\x01", 2);
                get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
	} else {
		*(u16*)dev->dev_addr = htons(dlci);
		dlci_to_q922(dev->broadcast, dlci);
	}
	dev->hard_start_xmit = pvc_xmit;
	dev->get_stats = pvc_get_stats;
	dev->open = pvc_open;
	dev->stop = pvc_close;
	dev->do_ioctl = pvc_ioctl;
	dev->change_mtu = pvc_change_mtu;
	dev->mtu = HDLC_MAX_MTU;
	dev->tx_queue_len = 0;
	dev->priv = pvc;

	result = dev_alloc_name(dev, dev->name);
	if (result < 0) {
		free_netdev(dev);
		delete_unused_pvcs(hdlc);
		return result;
	}

	if (register_netdevice(dev) != 0) {
		free_netdev(dev);
		delete_unused_pvcs(hdlc);
		return -EIO;
	}

	dev->destructor = free_netdev;
	*get_dev_p(pvc, type) = dev;
	if (!used) {
		hdlc->state.fr.dce_changed = 1;
		hdlc->state.fr.dce_pvc_count++;
	}
	return 0;
}



static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
{
	pvc_device *pvc;
	struct net_device *dev;

	if ((pvc = find_pvc(hdlc, dlci)) == NULL)
		return -ENOENT;

	if ((dev = *get_dev_p(pvc, type)) == NULL)
		return -ENOENT;

	if (dev->flags & IFF_UP)
		return -EBUSY;		/* PVC in use */

	unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
	*get_dev_p(pvc, type) = NULL;

	if (!pvc_is_used(pvc)) {
		hdlc->state.fr.dce_pvc_count--;
		hdlc->state.fr.dce_changed = 1;
	}
	delete_unused_pvcs(hdlc);
	return 0;
}



static void fr_destroy(hdlc_device *hdlc)
{
	pvc_device *pvc;

	pvc = hdlc->state.fr.first_pvc;
	hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
	hdlc->state.fr.dce_pvc_count = 0;
	hdlc->state.fr.dce_changed = 1;

	while (pvc) {
		pvc_device *next = pvc->next;
		/* destructors will free_netdev() main and ether */
		if (pvc->main)
			unregister_netdevice(pvc->main);

		if (pvc->ether)
			unregister_netdevice(pvc->ether);

		kfree(pvc);
		pvc = next;
	}
}



int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr)
{
	fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
	const size_t size = sizeof(fr_proto);
	fr_proto new_settings;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	fr_proto_pvc pvc;
	int result;

	switch (ifr->ifr_settings.type) {
	case IF_GET_PROTO:
		ifr->ifr_settings.type = IF_PROTO_FR;
		if (ifr->ifr_settings.size < size) {
			ifr->ifr_settings.size = size; /* data size wanted */
			return -ENOBUFS;
		}
		if (copy_to_user(fr_s, &hdlc->state.fr.settings, size))
			return -EFAULT;
		return 0;

	case IF_PROTO_FR:
		if(!capable(CAP_NET_ADMIN))
			return -EPERM;

		if(dev->flags & IFF_UP)
			return -EBUSY;

		if (copy_from_user(&new_settings, fr_s, size))
			return -EFAULT;

		if (new_settings.lmi == LMI_DEFAULT)
			new_settings.lmi = LMI_ANSI;

		if ((new_settings.lmi != LMI_NONE &&
		     new_settings.lmi != LMI_ANSI &&
		     new_settings.lmi != LMI_CCITT &&
		     new_settings.lmi != LMI_CISCO) ||
		    new_settings.t391 < 1 ||
		    new_settings.t392 < 2 ||
		    new_settings.n391 < 1 ||
		    new_settings.n392 < 1 ||
		    new_settings.n393 < new_settings.n392 ||
		    new_settings.n393 > 32 ||
		    (new_settings.dce != 0 &&
		     new_settings.dce != 1))
			return -EINVAL;

		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
		if (result)
			return result;

		if (hdlc->proto.id != IF_PROTO_FR) {
			hdlc_proto_detach(hdlc);
			hdlc->state.fr.first_pvc = NULL;
			hdlc->state.fr.dce_pvc_count = 0;
		}
		memcpy(&hdlc->state.fr.settings, &new_settings, size);
		memset(&hdlc->proto, 0, sizeof(hdlc->proto));

		hdlc->proto.close = fr_close;
		hdlc->proto.start = fr_start;
		hdlc->proto.stop = fr_stop;
		hdlc->proto.detach = fr_destroy;
		hdlc->proto.netif_rx = fr_rx;
		hdlc->proto.id = IF_PROTO_FR;
		dev->hard_start_xmit = hdlc->xmit;
		dev->hard_header = NULL;
		dev->type = ARPHRD_FRAD;
		dev->flags = IFF_POINTOPOINT | IFF_NOARP;
		dev->addr_len = 0;
		return 0;

	case IF_PROTO_FR_ADD_PVC:
	case IF_PROTO_FR_DEL_PVC:
	case IF_PROTO_FR_ADD_ETH_PVC:
	case IF_PROTO_FR_DEL_ETH_PVC:
		if(!capable(CAP_NET_ADMIN))
			return -EPERM;

		if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
				   sizeof(fr_proto_pvc)))
			return -EFAULT;

		if (pvc.dlci <= 0 || pvc.dlci >= 1024)
			return -EINVAL;	/* Only 10 bits, DLCI 0 reserved */

		if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
		    ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
			result = ARPHRD_ETHER; /* bridged Ethernet device */
		else
			result = ARPHRD_DLCI;

		if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
		    ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
			return fr_add_pvc(dev, pvc.dlci, result);
		else
			return fr_del_pvc(hdlc, pvc.dlci, result);
	}

	return -EINVAL;
}