[deliverable/linux.git] / net / mac802154 / rx.c

/*
 * Copyright (C) 2007-2012 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by:
 * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/crc-ccitt.h>
#include <asm/unaligned.h>

#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
#include <net/rtnetlink.h>
#include <linux/nl802154.h>

#include "ieee802154_i.h"

static int ieee802154_deliver_skb(struct sk_buff *skb)
{
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->protocol = htons(ETH_P_IEEE802154);

	return netif_receive_skb(skb);
}

static int
ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
		       struct sk_buff *skb, const struct ieee802154_hdr *hdr)
{
	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
	__le16 span, sshort;
	int rc;

	pr_debug("getting packet via slave interface %s\n", sdata->dev->name);

	spin_lock_bh(&sdata->mib_lock);

	span = wpan_dev->pan_id;
	sshort = wpan_dev->short_addr;

	switch (mac_cb(skb)->dest.mode) {
	case IEEE802154_ADDR_NONE:
		if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
			/* FIXME: check if we are PAN coordinator */
			skb->pkt_type = PACKET_OTHERHOST;
		else
			/* ACK comes with both addresses empty */
			skb->pkt_type = PACKET_HOST;
		break;
	case IEEE802154_ADDR_LONG:
		if (mac_cb(skb)->dest.pan_id != span &&
		    mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
			skb->pkt_type = PACKET_OTHERHOST;
		else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
			skb->pkt_type = PACKET_HOST;
		else
			skb->pkt_type = PACKET_OTHERHOST;
		break;
	case IEEE802154_ADDR_SHORT:
		if (mac_cb(skb)->dest.pan_id != span &&
		    mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
			skb->pkt_type = PACKET_OTHERHOST;
		else if (mac_cb(skb)->dest.short_addr == sshort)
			skb->pkt_type = PACKET_HOST;
		else if (mac_cb(skb)->dest.short_addr ==
			  cpu_to_le16(IEEE802154_ADDR_BROADCAST))
			skb->pkt_type = PACKET_BROADCAST;
		else
			skb->pkt_type = PACKET_OTHERHOST;
		break;
	default:
		spin_unlock_bh(&sdata->mib_lock);
		pr_debug("invalid dest mode\n");
		kfree_skb(skb);
		return NET_RX_DROP;
	}

	spin_unlock_bh(&sdata->mib_lock);

	skb->dev = sdata->dev;

	rc = mac802154_llsec_decrypt(&sdata->sec, skb);
	if (rc) {
		pr_debug("decryption failed: %i\n", rc);
		goto fail;
	}

	sdata->dev->stats.rx_packets++;
	sdata->dev->stats.rx_bytes += skb->len;

	switch (mac_cb(skb)->type) {
	case IEEE802154_FC_TYPE_DATA:
		return ieee802154_deliver_skb(skb);
	default:
		pr_warn("ieee802154: bad frame received (type = %d)\n",
			mac_cb(skb)->type);
		goto fail;
	}

fail:
	kfree_skb(skb);
	return NET_RX_DROP;
}

static void
ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
{
	if (addr->mode == IEEE802154_ADDR_NONE)
		pr_debug("%s not present\n", name);

	pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
	if (addr->mode == IEEE802154_ADDR_SHORT) {
		pr_debug("%s is short: %04x\n", name,
			 le16_to_cpu(addr->short_addr));
	} else {
		u64 hw = swab64((__force u64)addr->extended_addr);

		pr_debug("%s is hardware: %8phC\n", name, &hw);
	}
}

static int
ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
{
	int hlen;
	struct ieee802154_mac_cb *cb = mac_cb_init(skb);

	skb_reset_mac_header(skb);

	hlen = ieee802154_hdr_pull(skb, hdr);
	if (hlen < 0)
		return -EINVAL;

	skb->mac_len = hlen;

	pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
		 hdr->seq);

	cb->type = hdr->fc.type;
	cb->ackreq = hdr->fc.ack_request;
	cb->secen = hdr->fc.security_enabled;

	ieee802154_print_addr("destination", &hdr->dest);
	ieee802154_print_addr("source", &hdr->source);

	cb->source = hdr->source;
	cb->dest = hdr->dest;

	if (hdr->fc.security_enabled) {
		u64 key;

		pr_debug("seclevel %i\n", hdr->sec.level);

		switch (hdr->sec.key_id_mode) {
		case IEEE802154_SCF_KEY_IMPLICIT:
			pr_debug("implicit key\n");
			break;

		case IEEE802154_SCF_KEY_INDEX:
			pr_debug("key %02x\n", hdr->sec.key_id);
			break;

		case IEEE802154_SCF_KEY_SHORT_INDEX:
			pr_debug("key %04x:%04x %02x\n",
				 le32_to_cpu(hdr->sec.short_src) >> 16,
				 le32_to_cpu(hdr->sec.short_src) & 0xffff,
				 hdr->sec.key_id);
			break;

		case IEEE802154_SCF_KEY_HW_INDEX:
			key = swab64((__force u64)hdr->sec.extended_src);
			pr_debug("key source %8phC %02x\n", &key,
				 hdr->sec.key_id);
			break;
		}
	}

	return 0;
}

static void
__ieee802154_rx_handle_packet(struct ieee802154_local *local,
			      struct sk_buff *skb)
{
	int ret;
	struct ieee802154_sub_if_data *sdata;
	struct ieee802154_hdr hdr;

	ret = ieee802154_parse_frame_start(skb, &hdr);
	if (ret) {
		pr_debug("got invalid frame\n");
		kfree_skb(skb);
		return;
	}

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (sdata->vif.type != IEEE802154_DEV_WPAN ||
		    !netif_running(sdata->dev))
			continue;

		ieee802154_subif_frame(sdata, skb, &hdr);
		skb = NULL;
		break;
	}

	if (skb)
		kfree_skb(skb);
}

static void
ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
{
	struct sk_buff *skb2;
	struct ieee802154_sub_if_data *sdata;

	skb_reset_mac_header(skb);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_IEEE802154);

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (sdata->vif.type != IEEE802154_DEV_MONITOR)
			continue;

		if (!ieee802154_sdata_running(sdata))
			continue;

		skb2 = skb_clone(skb, GFP_ATOMIC);
		if (skb2) {
			skb2->dev = sdata->dev;
			ieee802154_deliver_skb(skb2);

			sdata->dev->stats.rx_packets++;
			sdata->dev->stats.rx_bytes += skb->len;
		}
	}
}

void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
{
	struct ieee802154_local *local = hw_to_local(hw);
	u16 crc;

	WARN_ON_ONCE(softirq_count() == 0);

	/* TODO: When a transceiver omits the checksum here, we
	 * add an own calculated one. This is currently an ugly
	 * solution because the monitor needs a crc here.
	 */
	if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
		crc = crc_ccitt(0, skb->data, skb->len);
		put_unaligned_le16(crc, skb_put(skb, 2));
	}

	rcu_read_lock();

	ieee802154_monitors_rx(local, skb);

	/* Check if transceiver doesn't validate the checksum.
	 * If not we validate the checksum here.
	 */
	if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
		crc = crc_ccitt(0, skb->data, skb->len);
		if (crc) {
			rcu_read_unlock();
			kfree_skb(skb);
			return;
		}
	}
	/* remove crc */
	skb_trim(skb, skb->len - 2);

	__ieee802154_rx_handle_packet(local, skb);

	rcu_read_unlock();
}
EXPORT_SYMBOL(ieee802154_rx);

void
ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
{
	struct ieee802154_local *local = hw_to_local(hw);

	mac_cb(skb)->lqi = lqi;
	skb->pkt_type = IEEE802154_RX_MSG;
	skb_queue_tail(&local->skb_queue, skb);
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee802154_rx_irqsafe);
Commit	Line	Data
1cd829c8	1	/*
	2	* Copyright (C) 2007-2012 Siemens AG
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
1cd829c8	13	* Written by:
	14	* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
	15	* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
	16	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	17	* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
1cd829c8	22	#include <linux/netdevice.h>
1cd829c8	23	#include <linux/crc-ccitt.h>
b7889497	24	#include <asm/unaligned.h>
1cd829c8	25
	26	#include <net/mac802154.h>
	27	#include <net/ieee802154_netdev.h>
2a9820c9 AA	28	#include <net/rtnetlink.h>
2a9820c9 AA	29	#include <linux/nl802154.h>
1cd829c8	30
0f1556bc	31	#include "ieee802154_i.h"
1cd829c8	32
08c511a7	33	static int ieee802154_deliver_skb(struct sk_buff *skb)
2a9820c9	34	{
75a46f0e	35	skb->ip_summed = CHECKSUM_UNNECESSARY;
702dcf99 AA	36	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	37
2a9820c9 AA	38	return netif_receive_skb(skb);
	39	}
	40
	41	static int
be9d215f AA	42	ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
be9d215f AA	43	struct sk_buff skb, const struct ieee802154_hdr hdr)
2a9820c9	44	{
863e88f2	45	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
2a9820c9 AA	46	__le16 span, sshort;
	47	int rc;
	48
	49	pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
	50
	51	spin_lock_bh(&sdata->mib_lock);
	52
863e88f2 AA	53	span = wpan_dev->pan_id;
863e88f2 AA	54	sshort = wpan_dev->short_addr;
2a9820c9 AA	55
	56	switch (mac_cb(skb)->dest.mode) {
	57	case IEEE802154_ADDR_NONE:
	58	if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
	59	/* FIXME: check if we are PAN coordinator */
	60	skb->pkt_type = PACKET_OTHERHOST;
	61	else
	62	/* ACK comes with both addresses empty */
	63	skb->pkt_type = PACKET_HOST;
	64	break;
	65	case IEEE802154_ADDR_LONG:
	66	if (mac_cb(skb)->dest.pan_id != span &&
	67	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	68	skb->pkt_type = PACKET_OTHERHOST;
863e88f2	69	else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
2a9820c9 AA	70	skb->pkt_type = PACKET_HOST;
	71	else
	72	skb->pkt_type = PACKET_OTHERHOST;
	73	break;
	74	case IEEE802154_ADDR_SHORT:
	75	if (mac_cb(skb)->dest.pan_id != span &&
	76	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	77	skb->pkt_type = PACKET_OTHERHOST;
	78	else if (mac_cb(skb)->dest.short_addr == sshort)
	79	skb->pkt_type = PACKET_HOST;
	80	else if (mac_cb(skb)->dest.short_addr ==
	81	cpu_to_le16(IEEE802154_ADDR_BROADCAST))
	82	skb->pkt_type = PACKET_BROADCAST;
	83	else
	84	skb->pkt_type = PACKET_OTHERHOST;
	85	break;
	86	default:
	87	spin_unlock_bh(&sdata->mib_lock);
	88	pr_debug("invalid dest mode\n");
	89	kfree_skb(skb);
	90	return NET_RX_DROP;
	91	}
	92
	93	spin_unlock_bh(&sdata->mib_lock);
	94
	95	skb->dev = sdata->dev;
	96
	97	rc = mac802154_llsec_decrypt(&sdata->sec, skb);
	98	if (rc) {
	99	pr_debug("decryption failed: %i\n", rc);
	100	goto fail;
	101	}
	102
	103	sdata->dev->stats.rx_packets++;
	104	sdata->dev->stats.rx_bytes += skb->len;
	105
	106	switch (mac_cb(skb)->type) {
	107	case IEEE802154_FC_TYPE_DATA:
08c511a7	108	return ieee802154_deliver_skb(skb);
2a9820c9 AA	109	default:
	110	pr_warn("ieee802154: bad frame received (type = %d)\n",
	111	mac_cb(skb)->type);
	112	goto fail;
	113	}
	114
	115	fail:
	116	kfree_skb(skb);
	117	return NET_RX_DROP;
	118	}
	119
be9d215f AA	120	static void
be9d215f AA	121	ieee802154_print_addr(const char name, const struct ieee802154_addr addr)
2a9820c9 AA	122	{
	123	if (addr->mode == IEEE802154_ADDR_NONE)
	124	pr_debug("%s not present\n", name);
	125
	126	pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
	127	if (addr->mode == IEEE802154_ADDR_SHORT) {
	128	pr_debug("%s is short: %04x\n", name,
	129	le16_to_cpu(addr->short_addr));
	130	} else {
	131	u64 hw = swab64((__force u64)addr->extended_addr);
	132
	133	pr_debug("%s is hardware: %8phC\n", name, &hw);
	134	}
	135	}
	136
be9d215f AA	137	static int
be9d215f AA	138	ieee802154_parse_frame_start(struct sk_buff skb, struct ieee802154_hdr hdr)
2a9820c9 AA	139	{
	140	int hlen;
	141	struct ieee802154_mac_cb *cb = mac_cb_init(skb);
	142
9cf215d0 AA	143	skb_reset_mac_header(skb);
9cf215d0 AA	144
2a9820c9 AA	145	hlen = ieee802154_hdr_pull(skb, hdr);
	146	if (hlen < 0)
	147	return -EINVAL;
	148
	149	skb->mac_len = hlen;
	150
	151	pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
	152	hdr->seq);
	153
	154	cb->type = hdr->fc.type;
	155	cb->ackreq = hdr->fc.ack_request;
	156	cb->secen = hdr->fc.security_enabled;
	157
be9d215f AA	158	ieee802154_print_addr("destination", &hdr->dest);
be9d215f AA	159	ieee802154_print_addr("source", &hdr->source);
2a9820c9 AA	160
	161	cb->source = hdr->source;
	162	cb->dest = hdr->dest;
	163
	164	if (hdr->fc.security_enabled) {
	165	u64 key;
	166
	167	pr_debug("seclevel %i\n", hdr->sec.level);
	168
	169	switch (hdr->sec.key_id_mode) {
	170	case IEEE802154_SCF_KEY_IMPLICIT:
	171	pr_debug("implicit key\n");
	172	break;
	173
	174	case IEEE802154_SCF_KEY_INDEX:
	175	pr_debug("key %02x\n", hdr->sec.key_id);
	176	break;
	177
	178	case IEEE802154_SCF_KEY_SHORT_INDEX:
	179	pr_debug("key %04x:%04x %02x\n",
	180	le32_to_cpu(hdr->sec.short_src) >> 16,
	181	le32_to_cpu(hdr->sec.short_src) & 0xffff,
	182	hdr->sec.key_id);
	183	break;
	184
	185	case IEEE802154_SCF_KEY_HW_INDEX:
	186	key = swab64((__force u64)hdr->sec.extended_src);
	187	pr_debug("key source %8phC %02x\n", &key,
	188	hdr->sec.key_id);
	189	break;
	190	}
	191	}
	192
	193	return 0;
	194	}
	195
	196	static void
be9d215f AA	197	__ieee802154_rx_handle_packet(struct ieee802154_local *local,
be9d215f AA	198	struct sk_buff *skb)
2a9820c9 AA	199	{
	200	int ret;
	201	struct ieee802154_sub_if_data *sdata;
	202	struct ieee802154_hdr hdr;
	203
be9d215f	204	ret = ieee802154_parse_frame_start(skb, &hdr);
2a9820c9 AA	205	if (ret) {
	206	pr_debug("got invalid frame\n");
	207	kfree_skb(skb);
	208	return;
	209	}
	210
2a9820c9	211	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
7c118c1a	212	if (sdata->vif.type != IEEE802154_DEV_WPAN \|\|
2a9820c9 AA	213	!netif_running(sdata->dev))
	214	continue;
	215
be9d215f	216	ieee802154_subif_frame(sdata, skb, &hdr);
2a9820c9 AA	217	skb = NULL;
	218	break;
	219	}
2a9820c9 AA	220
	221	if (skb)
	222	kfree_skb(skb);
	223	}
	224
4ca18be5	225	static void
be9d215f	226	ieee802154_monitors_rx(struct ieee802154_local local, struct sk_buff skb)
2a9820c9 AA	227	{
	228	struct sk_buff *skb2;
	229	struct ieee802154_sub_if_data *sdata;
2a9820c9	230
9cf215d0	231	skb_reset_mac_header(skb);
75a46f0e	232	skb->ip_summed = CHECKSUM_UNNECESSARY;
c9ca6401	233	skb->pkt_type = PACKET_OTHERHOST;
702dcf99 AA	234	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	235
2a9820c9	236	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
7c118c1a	237	if (sdata->vif.type != IEEE802154_DEV_MONITOR)
20b48120 AA	238	continue;
	239
	240	if (!ieee802154_sdata_running(sdata))
2a9820c9 AA	241	continue;
	242
	243	skb2 = skb_clone(skb, GFP_ATOMIC);
05f7de67 AA	244	if (skb2) {
	245	skb2->dev = sdata->dev;
	246	ieee802154_deliver_skb(skb2);
2a9820c9	247
05f7de67 AA	248	sdata->dev->stats.rx_packets++;
	249	sdata->dev->stats.rx_bytes += skb->len;
	250	}
2a9820c9	251	}
2a9820c9 AA	252	}
2a9820c9 AA	253
469100d6	254	void ieee802154_rx(struct ieee802154_hw hw, struct sk_buff skb)
1cd829c8	255	{
60741361	256	struct ieee802154_local *local = hw_to_local(hw);
ec718f3d	257	u16 crc;
1cd829c8	258
469100d6 AA	259	WARN_ON_ONCE(softirq_count() == 0);
469100d6 AA	260
b7889497 AA	261	/* TODO: When a transceiver omits the checksum here, we
	262	* add an own calculated one. This is currently an ugly
	263	* solution because the monitor needs a crc here.
	264	*/
	265	if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
ec718f3d	266	crc = crc_ccitt(0, skb->data, skb->len);
b7889497	267	put_unaligned_le16(crc, skb_put(skb, 2));
1cd829c8	268	}
1cd829c8	269
e176b681 AA	270	rcu_read_lock();
e176b681 AA	271
be9d215f	272	ieee802154_monitors_rx(local, skb);
2d3b5b0a	273
ec718f3d AA	274	/* Check if transceiver doesn't validate the checksum.
	275	* If not we validate the checksum here.
	276	*/
	277	if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
	278	crc = crc_ccitt(0, skb->data, skb->len);
	279	if (crc) {
	280	rcu_read_unlock();
	281	kfree_skb(skb);
	282	return;
	283	}
	284	}
b7889497 AA	285	/* remove crc */
b7889497 AA	286	skb_trim(skb, skb->len - 2);
e176b681	287
b7889497	288	__ieee802154_rx_handle_packet(local, skb);
2d3b5b0a	289
b7889497	290	rcu_read_unlock();
1cd829c8	291	}
c5c47e67	292	EXPORT_SYMBOL(ieee802154_rx);
1cd829c8	293
1cd829c8	294	void
5a504397	295	ieee802154_rx_irqsafe(struct ieee802154_hw hw, struct sk_buff skb, u8 lqi)
1cd829c8	296	{
60741361	297	struct ieee802154_local *local = hw_to_local(hw);
1cd829c8	298
c5c47e67 AA	299	mac_cb(skb)->lqi = lqi;
	300	skb->pkt_type = IEEE802154_RX_MSG;
	301	skb_queue_tail(&local->skb_queue, skb);
	302	tasklet_schedule(&local->tasklet);
1cd829c8	303	}
1cd829c8	304	EXPORT_SYMBOL(ieee802154_rx_irqsafe);