[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/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 != NL802154_IFTYPE_NODE ||
		    !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 != NL802154_IFTYPE_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>
944742a3	28	#include <net/nl802154.h>
1cd829c8	29
0f1556bc	30	#include "ieee802154_i.h"
1cd829c8	31
08c511a7	32	static int ieee802154_deliver_skb(struct sk_buff *skb)
2a9820c9	33	{
75a46f0e	34	skb->ip_summed = CHECKSUM_UNNECESSARY;
702dcf99 AA	35	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	36
2a9820c9 AA	37	return netif_receive_skb(skb);
	38	}
	39
	40	static int
be9d215f AA	41	ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
be9d215f AA	42	struct sk_buff skb, const struct ieee802154_hdr hdr)
2a9820c9	43	{
863e88f2	44	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
2a9820c9 AA	45	__le16 span, sshort;
	46	int rc;
	47
	48	pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
	49
	50	spin_lock_bh(&sdata->mib_lock);
	51
863e88f2 AA	52	span = wpan_dev->pan_id;
863e88f2 AA	53	sshort = wpan_dev->short_addr;
2a9820c9 AA	54
	55	switch (mac_cb(skb)->dest.mode) {
	56	case IEEE802154_ADDR_NONE:
	57	if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
	58	/* FIXME: check if we are PAN coordinator */
	59	skb->pkt_type = PACKET_OTHERHOST;
	60	else
	61	/* ACK comes with both addresses empty */
	62	skb->pkt_type = PACKET_HOST;
	63	break;
	64	case IEEE802154_ADDR_LONG:
	65	if (mac_cb(skb)->dest.pan_id != span &&
	66	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	67	skb->pkt_type = PACKET_OTHERHOST;
863e88f2	68	else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
2a9820c9 AA	69	skb->pkt_type = PACKET_HOST;
	70	else
	71	skb->pkt_type = PACKET_OTHERHOST;
	72	break;
	73	case IEEE802154_ADDR_SHORT:
	74	if (mac_cb(skb)->dest.pan_id != span &&
	75	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	76	skb->pkt_type = PACKET_OTHERHOST;
	77	else if (mac_cb(skb)->dest.short_addr == sshort)
	78	skb->pkt_type = PACKET_HOST;
	79	else if (mac_cb(skb)->dest.short_addr ==
	80	cpu_to_le16(IEEE802154_ADDR_BROADCAST))
	81	skb->pkt_type = PACKET_BROADCAST;
	82	else
	83	skb->pkt_type = PACKET_OTHERHOST;
	84	break;
	85	default:
	86	spin_unlock_bh(&sdata->mib_lock);
	87	pr_debug("invalid dest mode\n");
	88	kfree_skb(skb);
	89	return NET_RX_DROP;
	90	}
	91
	92	spin_unlock_bh(&sdata->mib_lock);
	93
	94	skb->dev = sdata->dev;
	95
	96	rc = mac802154_llsec_decrypt(&sdata->sec, skb);
	97	if (rc) {
	98	pr_debug("decryption failed: %i\n", rc);
	99	goto fail;
	100	}
	101
	102	sdata->dev->stats.rx_packets++;
	103	sdata->dev->stats.rx_bytes += skb->len;
	104
	105	switch (mac_cb(skb)->type) {
	106	case IEEE802154_FC_TYPE_DATA:
08c511a7	107	return ieee802154_deliver_skb(skb);
2a9820c9 AA	108	default:
	109	pr_warn("ieee802154: bad frame received (type = %d)\n",
	110	mac_cb(skb)->type);
	111	goto fail;
	112	}
	113
	114	fail:
	115	kfree_skb(skb);
	116	return NET_RX_DROP;
	117	}
	118
be9d215f AA	119	static void
be9d215f AA	120	ieee802154_print_addr(const char name, const struct ieee802154_addr addr)
2a9820c9 AA	121	{
	122	if (addr->mode == IEEE802154_ADDR_NONE)
	123	pr_debug("%s not present\n", name);
	124
	125	pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
	126	if (addr->mode == IEEE802154_ADDR_SHORT) {
	127	pr_debug("%s is short: %04x\n", name,
	128	le16_to_cpu(addr->short_addr));
	129	} else {
	130	u64 hw = swab64((__force u64)addr->extended_addr);
	131
	132	pr_debug("%s is hardware: %8phC\n", name, &hw);
	133	}
	134	}
	135
be9d215f AA	136	static int
be9d215f AA	137	ieee802154_parse_frame_start(struct sk_buff skb, struct ieee802154_hdr hdr)
2a9820c9 AA	138	{
	139	int hlen;
	140	struct ieee802154_mac_cb *cb = mac_cb_init(skb);
	141
9cf215d0 AA	142	skb_reset_mac_header(skb);
9cf215d0 AA	143
2a9820c9 AA	144	hlen = ieee802154_hdr_pull(skb, hdr);
	145	if (hlen < 0)
	146	return -EINVAL;
	147
	148	skb->mac_len = hlen;
	149
	150	pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
	151	hdr->seq);
	152
	153	cb->type = hdr->fc.type;
	154	cb->ackreq = hdr->fc.ack_request;
	155	cb->secen = hdr->fc.security_enabled;
	156
be9d215f AA	157	ieee802154_print_addr("destination", &hdr->dest);
be9d215f AA	158	ieee802154_print_addr("source", &hdr->source);
2a9820c9 AA	159
	160	cb->source = hdr->source;
	161	cb->dest = hdr->dest;
	162
	163	if (hdr->fc.security_enabled) {
	164	u64 key;
	165
	166	pr_debug("seclevel %i\n", hdr->sec.level);
	167
	168	switch (hdr->sec.key_id_mode) {
	169	case IEEE802154_SCF_KEY_IMPLICIT:
	170	pr_debug("implicit key\n");
	171	break;
	172
	173	case IEEE802154_SCF_KEY_INDEX:
	174	pr_debug("key %02x\n", hdr->sec.key_id);
	175	break;
	176
	177	case IEEE802154_SCF_KEY_SHORT_INDEX:
	178	pr_debug("key %04x:%04x %02x\n",
	179	le32_to_cpu(hdr->sec.short_src) >> 16,
	180	le32_to_cpu(hdr->sec.short_src) & 0xffff,
	181	hdr->sec.key_id);
	182	break;
	183
	184	case IEEE802154_SCF_KEY_HW_INDEX:
	185	key = swab64((__force u64)hdr->sec.extended_src);
	186	pr_debug("key source %8phC %02x\n", &key,
	187	hdr->sec.key_id);
	188	break;
	189	}
	190	}
	191
	192	return 0;
	193	}
	194
	195	static void
be9d215f AA	196	__ieee802154_rx_handle_packet(struct ieee802154_local *local,
be9d215f AA	197	struct sk_buff *skb)
2a9820c9 AA	198	{
	199	int ret;
	200	struct ieee802154_sub_if_data *sdata;
	201	struct ieee802154_hdr hdr;
	202
be9d215f	203	ret = ieee802154_parse_frame_start(skb, &hdr);
2a9820c9 AA	204	if (ret) {
	205	pr_debug("got invalid frame\n");
	206	kfree_skb(skb);
	207	return;
	208	}
	209
2a9820c9	210	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
944742a3	211	if (sdata->vif.type != NL802154_IFTYPE_NODE \|\|
2a9820c9 AA	212	!netif_running(sdata->dev))
	213	continue;
	214
be9d215f	215	ieee802154_subif_frame(sdata, skb, &hdr);
2a9820c9 AA	216	skb = NULL;
	217	break;
	218	}
2a9820c9 AA	219
	220	if (skb)
	221	kfree_skb(skb);
	222	}
	223
4ca18be5	224	static void
be9d215f	225	ieee802154_monitors_rx(struct ieee802154_local local, struct sk_buff skb)
2a9820c9 AA	226	{
	227	struct sk_buff *skb2;
	228	struct ieee802154_sub_if_data *sdata;
2a9820c9	229
9cf215d0	230	skb_reset_mac_header(skb);
75a46f0e	231	skb->ip_summed = CHECKSUM_UNNECESSARY;
c9ca6401	232	skb->pkt_type = PACKET_OTHERHOST;
702dcf99 AA	233	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	234
2a9820c9	235	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
944742a3	236	if (sdata->vif.type != NL802154_IFTYPE_MONITOR)
20b48120 AA	237	continue;
	238
	239	if (!ieee802154_sdata_running(sdata))
2a9820c9 AA	240	continue;
	241
	242	skb2 = skb_clone(skb, GFP_ATOMIC);
05f7de67 AA	243	if (skb2) {
	244	skb2->dev = sdata->dev;
	245	ieee802154_deliver_skb(skb2);
2a9820c9	246
05f7de67 AA	247	sdata->dev->stats.rx_packets++;
	248	sdata->dev->stats.rx_bytes += skb->len;
	249	}
2a9820c9	250	}
2a9820c9 AA	251	}
2a9820c9 AA	252
469100d6	253	void ieee802154_rx(struct ieee802154_hw hw, struct sk_buff skb)
1cd829c8	254	{
60741361	255	struct ieee802154_local *local = hw_to_local(hw);
ec718f3d	256	u16 crc;
1cd829c8	257
469100d6 AA	258	WARN_ON_ONCE(softirq_count() == 0);
469100d6 AA	259
b7889497 AA	260	/* TODO: When a transceiver omits the checksum here, we
	261	* add an own calculated one. This is currently an ugly
	262	* solution because the monitor needs a crc here.
	263	*/
	264	if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
ec718f3d	265	crc = crc_ccitt(0, skb->data, skb->len);
b7889497	266	put_unaligned_le16(crc, skb_put(skb, 2));
1cd829c8	267	}
1cd829c8	268
e176b681 AA	269	rcu_read_lock();
e176b681 AA	270
be9d215f	271	ieee802154_monitors_rx(local, skb);
2d3b5b0a	272
ec718f3d AA	273	/* Check if transceiver doesn't validate the checksum.
	274	* If not we validate the checksum here.
	275	*/
	276	if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
	277	crc = crc_ccitt(0, skb->data, skb->len);
	278	if (crc) {
	279	rcu_read_unlock();
	280	kfree_skb(skb);
	281	return;
	282	}
	283	}
b7889497 AA	284	/* remove crc */
b7889497 AA	285	skb_trim(skb, skb->len - 2);
e176b681	286
b7889497	287	__ieee802154_rx_handle_packet(local, skb);
2d3b5b0a	288
b7889497	289	rcu_read_unlock();
1cd829c8	290	}
c5c47e67	291	EXPORT_SYMBOL(ieee802154_rx);
1cd829c8	292
1cd829c8	293	void
5a504397	294	ieee802154_rx_irqsafe(struct ieee802154_hw hw, struct sk_buff skb, u8 lqi)
1cd829c8	295	{
60741361	296	struct ieee802154_local *local = hw_to_local(hw);
1cd829c8	297
c5c47e67 AA	298	mac_cb(skb)->lqi = lqi;
	299	skb->pkt_type = IEEE802154_RX_MSG;
	300	skb_queue_tail(&local->skb_queue, skb);
	301	tasklet_schedule(&local->tasklet);
1cd829c8	302	}
1cd829c8	303	EXPORT_SYMBOL(ieee802154_rx_irqsafe);