[linux-block.git] / net / mac802154 / rx.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2007-2012 Siemens AG
 *
 * 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;
	struct wpan_phy *wpan_phy = sdata->local->hw.phy;
	__le16 span, sshort;
	int rc;

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

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

	/* Level 3 filtering: Only beacons are accepted during scans */
	if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN &&
	    sdata->required_filtering > wpan_phy->filtering) {
		if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) {
			dev_dbg(&sdata->dev->dev,
				"drop non-beacon frame (0x%x) during scan\n",
				mac_cb(skb)->type);
			goto fail;
		}
	}

	switch (mac_cb(skb)->dest.mode) {
	case IEEE802154_ADDR_NONE:
		if (hdr->source.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:
		pr_debug("invalid dest mode\n");
		goto fail;
	}

	skb->dev = sdata->dev;

	/* TODO this should be moved after netif_receive_skb call, otherwise
	 * wireshark will show a mac header with security fields and the
	 * payload is already decrypted.
	 */
	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_BEACON:
	case IEEE802154_FC_TYPE_ACK:
	case IEEE802154_FC_TYPE_MAC_CMD:
		goto fail;

	case IEEE802154_FC_TYPE_DATA:
		return ieee802154_deliver_skb(skb);
	default:
		pr_warn_ratelimited("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);
		return;
	}

	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(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;
	struct sk_buff *skb2;

	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->wpan_dev.iftype == NL802154_IFTYPE_MONITOR)
			continue;

		if (!ieee802154_sdata_running(sdata))
			continue;

		/* Do not deliver packets received on interfaces expecting
		 * AACK=1 if the address filters where disabled.
		 */
		if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS &&
		    sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS)
			continue;

		skb2 = skb_clone(skb, GFP_ATOMIC);
		if (skb2) {
			skb2->dev = sdata->dev;
			ieee802154_subif_frame(sdata, skb2, &hdr);
		}
	}
}

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->wpan_dev.iftype != 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_local *local, struct sk_buff *skb)
{
	u16 crc;

	WARN_ON_ONCE(softirq_count() == 0);

	if (local->suspended)
		goto free_skb;

	/* 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);

	/* Level 1 filtering: Check the FCS by software when relevant */
	if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) {
		crc = crc_ccitt(0, skb->data, skb->len);
		if (crc)
			goto drop;
	}
	/* remove crc */
	skb_trim(skb, skb->len - 2);

	__ieee802154_rx_handle_packet(local, skb);

drop:
	rcu_read_unlock();
free_skb:
	kfree_skb(skb);
}

void
ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
{
	struct ieee802154_local *local = hw_to_local(hw);
	struct ieee802154_mac_cb *cb = mac_cb_init(skb);

	cb->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
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
1cd829c8	2	/*
	3	* Copyright (C) 2007-2012 Siemens AG
	4	*
1cd829c8	5	* Written by:
	6	* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
	7	* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
	8	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	9	* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
1cd829c8	14	#include <linux/netdevice.h>
1cd829c8	15	#include <linux/crc-ccitt.h>
b7889497	16	#include <asm/unaligned.h>
1cd829c8	17
	18	#include <net/mac802154.h>
	19	#include <net/ieee802154_netdev.h>
944742a3	20	#include <net/nl802154.h>
1cd829c8	21
0f1556bc	22	#include "ieee802154_i.h"
1cd829c8	23
08c511a7	24	static int ieee802154_deliver_skb(struct sk_buff *skb)
2a9820c9	25	{
75a46f0e	26	skb->ip_summed = CHECKSUM_UNNECESSARY;
702dcf99 AA	27	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	28
2a9820c9 AA	29	return netif_receive_skb(skb);
	30	}
	31
	32	static int
be9d215f AA	33	ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
be9d215f AA	34	struct sk_buff skb, const struct ieee802154_hdr hdr)
2a9820c9	35	{
863e88f2	36	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
4161634b	37	struct wpan_phy *wpan_phy = sdata->local->hw.phy;
2a9820c9 AA	38	__le16 span, sshort;
	39	int rc;
	40
	41	pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
	42
863e88f2 AA	43	span = wpan_dev->pan_id;
863e88f2 AA	44	sshort = wpan_dev->short_addr;
2a9820c9	45
4161634b MR	46	/* Level 3 filtering: Only beacons are accepted during scans */
	47	if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN &&
	48	sdata->required_filtering > wpan_phy->filtering) {
	49	if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) {
	50	dev_dbg(&sdata->dev->dev,
	51	"drop non-beacon frame (0x%x) during scan\n",
	52	mac_cb(skb)->type);
	53	goto fail;
	54	}
	55	}
	56
2a9820c9 AA	57	switch (mac_cb(skb)->dest.mode) {
2a9820c9 AA	58	case IEEE802154_ADDR_NONE:
f0da4711	59	if (hdr->source.mode != IEEE802154_ADDR_NONE)
2a9820c9 AA	60	/* FIXME: check if we are PAN coordinator */
	61	skb->pkt_type = PACKET_OTHERHOST;
	62	else
	63	/* ACK comes with both addresses empty */
	64	skb->pkt_type = PACKET_HOST;
	65	break;
	66	case IEEE802154_ADDR_LONG:
	67	if (mac_cb(skb)->dest.pan_id != span &&
	68	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	69	skb->pkt_type = PACKET_OTHERHOST;
863e88f2	70	else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
2a9820c9 AA	71	skb->pkt_type = PACKET_HOST;
	72	else
	73	skb->pkt_type = PACKET_OTHERHOST;
	74	break;
	75	case IEEE802154_ADDR_SHORT:
	76	if (mac_cb(skb)->dest.pan_id != span &&
	77	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	78	skb->pkt_type = PACKET_OTHERHOST;
	79	else if (mac_cb(skb)->dest.short_addr == sshort)
	80	skb->pkt_type = PACKET_HOST;
	81	else if (mac_cb(skb)->dest.short_addr ==
	82	cpu_to_le16(IEEE802154_ADDR_BROADCAST))
	83	skb->pkt_type = PACKET_BROADCAST;
	84	else
	85	skb->pkt_type = PACKET_OTHERHOST;
	86	break;
	87	default:
2a9820c9	88	pr_debug("invalid dest mode\n");
bcb47aab	89	goto fail;
2a9820c9 AA	90	}
2a9820c9 AA	91
2a9820c9 AA	92	skb->dev = sdata->dev;
2a9820c9 AA	93
d58a2fa9 AA	94	/* TODO this should be moved after netif_receive_skb call, otherwise
	95	* wireshark will show a mac header with security fields and the
	96	* payload is already decrypted.
	97	*/
2a9820c9 AA	98	rc = mac802154_llsec_decrypt(&sdata->sec, skb);
	99	if (rc) {
	100	pr_debug("decryption failed: %i\n", rc);
	101	goto fail;
	102	}
	103
	104	sdata->dev->stats.rx_packets++;
	105	sdata->dev->stats.rx_bytes += skb->len;
	106
	107	switch (mac_cb(skb)->type) {
ca1de81a AR	108	case IEEE802154_FC_TYPE_BEACON:
	109	case IEEE802154_FC_TYPE_ACK:
	110	case IEEE802154_FC_TYPE_MAC_CMD:
	111	goto fail;
	112
2a9820c9	113	case IEEE802154_FC_TYPE_DATA:
08c511a7	114	return ieee802154_deliver_skb(skb);
2a9820c9	115	default:
bd89bb6d AR	116	pr_warn_ratelimited("ieee802154: bad frame received "
bd89bb6d AR	117	"(type = %d)\n", mac_cb(skb)->type);
2a9820c9 AA	118	goto fail;
	119	}
	120
	121	fail:
	122	kfree_skb(skb);
	123	return NET_RX_DROP;
	124	}
	125
be9d215f AA	126	static void
be9d215f AA	127	ieee802154_print_addr(const char name, const struct ieee802154_addr addr)
2a9820c9	128	{
3a22550a	129	if (addr->mode == IEEE802154_ADDR_NONE) {
2a9820c9	130	pr_debug("%s not present\n", name);
3a22550a MR	131	return;
3a22550a MR	132	}
2a9820c9 AA	133
	134	pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
	135	if (addr->mode == IEEE802154_ADDR_SHORT) {
	136	pr_debug("%s is short: %04x\n", name,
	137	le16_to_cpu(addr->short_addr));
	138	} else {
	139	u64 hw = swab64((__force u64)addr->extended_addr);
	140
	141	pr_debug("%s is hardware: %8phC\n", name, &hw);
	142	}
	143	}
	144
be9d215f AA	145	static int
be9d215f AA	146	ieee802154_parse_frame_start(struct sk_buff skb, struct ieee802154_hdr hdr)
2a9820c9 AA	147	{
2a9820c9 AA	148	int hlen;
5a5c4e06	149	struct ieee802154_mac_cb *cb = mac_cb(skb);
2a9820c9	150
9cf215d0 AA	151	skb_reset_mac_header(skb);
9cf215d0 AA	152
2a9820c9 AA	153	hlen = ieee802154_hdr_pull(skb, hdr);
	154	if (hlen < 0)
	155	return -EINVAL;
	156
	157	skb->mac_len = hlen;
	158
	159	pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
	160	hdr->seq);
	161
	162	cb->type = hdr->fc.type;
	163	cb->ackreq = hdr->fc.ack_request;
	164	cb->secen = hdr->fc.security_enabled;
	165
be9d215f AA	166	ieee802154_print_addr("destination", &hdr->dest);
be9d215f AA	167	ieee802154_print_addr("source", &hdr->source);
2a9820c9 AA	168
	169	cb->source = hdr->source;
	170	cb->dest = hdr->dest;
	171
	172	if (hdr->fc.security_enabled) {
	173	u64 key;
	174
	175	pr_debug("seclevel %i\n", hdr->sec.level);
	176
	177	switch (hdr->sec.key_id_mode) {
	178	case IEEE802154_SCF_KEY_IMPLICIT:
	179	pr_debug("implicit key\n");
	180	break;
	181
	182	case IEEE802154_SCF_KEY_INDEX:
	183	pr_debug("key %02x\n", hdr->sec.key_id);
	184	break;
	185
	186	case IEEE802154_SCF_KEY_SHORT_INDEX:
	187	pr_debug("key %04x:%04x %02x\n",
	188	le32_to_cpu(hdr->sec.short_src) >> 16,
	189	le32_to_cpu(hdr->sec.short_src) & 0xffff,
	190	hdr->sec.key_id);
	191	break;
	192
	193	case IEEE802154_SCF_KEY_HW_INDEX:
	194	key = swab64((__force u64)hdr->sec.extended_src);
	195	pr_debug("key source %8phC %02x\n", &key,
	196	hdr->sec.key_id);
	197	break;
	198	}
	199	}
	200
	201	return 0;
	202	}
	203
	204	static void
be9d215f AA	205	__ieee802154_rx_handle_packet(struct ieee802154_local *local,
be9d215f AA	206	struct sk_buff *skb)
2a9820c9 AA	207	{
	208	int ret;
	209	struct ieee802154_sub_if_data *sdata;
	210	struct ieee802154_hdr hdr;
2622e785	211	struct sk_buff *skb2;
2a9820c9	212
be9d215f	213	ret = ieee802154_parse_frame_start(skb, &hdr);
2a9820c9 AA	214	if (ret) {
	215	pr_debug("got invalid frame\n");
	216	kfree_skb(skb);
	217	return;
	218	}
	219
2a9820c9	220	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2622e785	221	if (sdata->wpan_dev.iftype == NL802154_IFTYPE_MONITOR)
1bc1754e VB	222	continue;
	223
	224	if (!ieee802154_sdata_running(sdata))
2a9820c9 AA	225	continue;
2a9820c9 AA	226
0218277d MR	227	/* Do not deliver packets received on interfaces expecting
	228	* AACK=1 if the address filters where disabled.
	229	*/
	230	if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS &&
	231	sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS)
	232	continue;
	233
2622e785 MR	234	skb2 = skb_clone(skb, GFP_ATOMIC);
	235	if (skb2) {
	236	skb2->dev = sdata->dev;
	237	ieee802154_subif_frame(sdata, skb2, &hdr);
	238	}
2a9820c9	239	}
2a9820c9 AA	240	}
2a9820c9 AA	241
4ca18be5	242	static void
be9d215f	243	ieee802154_monitors_rx(struct ieee802154_local local, struct sk_buff skb)
2a9820c9 AA	244	{
	245	struct sk_buff *skb2;
	246	struct ieee802154_sub_if_data *sdata;
2a9820c9	247
9cf215d0	248	skb_reset_mac_header(skb);
75a46f0e	249	skb->ip_summed = CHECKSUM_UNNECESSARY;
c9ca6401	250	skb->pkt_type = PACKET_OTHERHOST;
702dcf99 AA	251	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	252
2a9820c9	253	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
ed65963b	254	if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR)
20b48120 AA	255	continue;
	256
	257	if (!ieee802154_sdata_running(sdata))
2a9820c9 AA	258	continue;
	259
	260	skb2 = skb_clone(skb, GFP_ATOMIC);
05f7de67 AA	261	if (skb2) {
	262	skb2->dev = sdata->dev;
	263	ieee802154_deliver_skb(skb2);
2a9820c9	264
05f7de67 AA	265	sdata->dev->stats.rx_packets++;
	266	sdata->dev->stats.rx_bytes += skb->len;
	267	}
2a9820c9	268	}
2a9820c9 AA	269	}
2a9820c9 AA	270
d10270ce	271	void ieee802154_rx(struct ieee802154_local local, struct sk_buff skb)
1cd829c8	272	{
ec718f3d	273	u16 crc;
1cd829c8	274
469100d6 AA	275	WARN_ON_ONCE(softirq_count() == 0);
469100d6 AA	276
3cf24cf8	277	if (local->suspended)
4d1c7d87	278	goto free_skb;
3cf24cf8	279
b7889497 AA	280	/* TODO: When a transceiver omits the checksum here, we
	281	* add an own calculated one. This is currently an ugly
	282	* solution because the monitor needs a crc here.
	283	*/
	284	if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
ec718f3d	285	crc = crc_ccitt(0, skb->data, skb->len);
b7889497	286	put_unaligned_le16(crc, skb_put(skb, 2));
1cd829c8	287	}
1cd829c8	288
e176b681 AA	289	rcu_read_lock();
e176b681 AA	290
be9d215f	291	ieee802154_monitors_rx(local, skb);
2d3b5b0a	292
a4b5b4c5 MR	293	/* Level 1 filtering: Check the FCS by software when relevant */
a4b5b4c5 MR	294	if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) {
ec718f3d	295	crc = crc_ccitt(0, skb->data, skb->len);
4d1c7d87	296	if (crc)
3cf24cf8	297	goto drop;
ec718f3d	298	}
b7889497 AA	299	/* remove crc */
b7889497 AA	300	skb_trim(skb, skb->len - 2);
e176b681	301
b7889497	302	__ieee802154_rx_handle_packet(local, skb);
2d3b5b0a	303
3cf24cf8	304	drop:
4d1c7d87 MR	305	rcu_read_unlock();
4d1c7d87 MR	306	free_skb:
3cf24cf8	307	kfree_skb(skb);
1cd829c8	308	}
1cd829c8	309
1cd829c8	310	void
5a504397	311	ieee802154_rx_irqsafe(struct ieee802154_hw hw, struct sk_buff skb, u8 lqi)
1cd829c8	312	{
60741361	313	struct ieee802154_local *local = hw_to_local(hw);
5a5c4e06	314	struct ieee802154_mac_cb *cb = mac_cb_init(skb);
1cd829c8	315
5a5c4e06	316	cb->lqi = lqi;
c5c47e67 AA	317	skb->pkt_type = IEEE802154_RX_MSG;
	318	skb_queue_tail(&local->skb_queue, skb);
	319	tasklet_schedule(&local->tasklet);
1cd829c8	320	}
1cd829c8	321	EXPORT_SYMBOL(ieee802154_rx_irqsafe);