[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);
}

void mac802154_rx_beacon_worker(struct work_struct *work)
{
	struct ieee802154_local *local =
		container_of(work, struct ieee802154_local, rx_beacon_work);
	struct cfg802154_mac_pkt *mac_pkt;

	mac_pkt = list_first_entry_or_null(&local->rx_beacon_list,
					   struct cfg802154_mac_pkt, node);
	if (!mac_pkt)
		return;

	mac802154_process_beacon(local, mac_pkt->skb, mac_pkt->page, mac_pkt->channel);

	list_del(&mac_pkt->node);
	kfree_skb(mac_pkt->skb);
	kfree(mac_pkt);
}

static int
ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
		       struct sk_buff *skb, const struct ieee802154_hdr *hdr)
{
	struct wpan_phy *wpan_phy = sdata->local->hw.phy;
	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
	struct cfg802154_mac_pkt *mac_pkt;
	__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:
		dev_dbg(&sdata->dev->dev, "BEACON received\n");
		if (!mac802154_is_scanning(sdata->local))
			goto fail;

		mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC);
		if (!mac_pkt)
			goto fail;

		mac_pkt->skb = skb_get(skb);
		mac_pkt->sdata = sdata;
		mac_pkt->page = sdata->local->scan_page;
		mac_pkt->channel = sdata->local->scan_channel;
		list_add_tail(&mac_pkt->node, &sdata->local->rx_beacon_list);
		queue_work(sdata->local->mac_wq, &sdata->local->rx_beacon_work);
		return NET_RX_SUCCESS;
	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");
		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
57588c71 MR	32	void mac802154_rx_beacon_worker(struct work_struct *work)
	33	{
	34	struct ieee802154_local *local =
	35	container_of(work, struct ieee802154_local, rx_beacon_work);
	36	struct cfg802154_mac_pkt *mac_pkt;
	37
	38	mac_pkt = list_first_entry_or_null(&local->rx_beacon_list,
	39	struct cfg802154_mac_pkt, node);
	40	if (!mac_pkt)
	41	return;
	42
	43	mac802154_process_beacon(local, mac_pkt->skb, mac_pkt->page, mac_pkt->channel);
	44
	45	list_del(&mac_pkt->node);
	46	kfree_skb(mac_pkt->skb);
	47	kfree(mac_pkt);
	48	}
	49
2a9820c9	50	static int
be9d215f AA	51	ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
be9d215f AA	52	struct sk_buff skb, const struct ieee802154_hdr hdr)
2a9820c9	53	{
4161634b	54	struct wpan_phy *wpan_phy = sdata->local->hw.phy;
57588c71 MR	55	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
57588c71 MR	56	struct cfg802154_mac_pkt *mac_pkt;
2a9820c9 AA	57	__le16 span, sshort;
	58	int rc;
	59
	60	pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
	61
863e88f2 AA	62	span = wpan_dev->pan_id;
863e88f2 AA	63	sshort = wpan_dev->short_addr;
2a9820c9	64
4161634b MR	65	/* Level 3 filtering: Only beacons are accepted during scans */
	66	if (sdata->required_filtering == IEEE802154_FILTERING_3_SCAN &&
	67	sdata->required_filtering > wpan_phy->filtering) {
	68	if (mac_cb(skb)->type != IEEE802154_FC_TYPE_BEACON) {
	69	dev_dbg(&sdata->dev->dev,
	70	"drop non-beacon frame (0x%x) during scan\n",
	71	mac_cb(skb)->type);
	72	goto fail;
	73	}
	74	}
	75
2a9820c9 AA	76	switch (mac_cb(skb)->dest.mode) {
2a9820c9 AA	77	case IEEE802154_ADDR_NONE:
f0da4711	78	if (hdr->source.mode != IEEE802154_ADDR_NONE)
2a9820c9 AA	79	/* FIXME: check if we are PAN coordinator */
	80	skb->pkt_type = PACKET_OTHERHOST;
	81	else
	82	/* ACK comes with both addresses empty */
	83	skb->pkt_type = PACKET_HOST;
	84	break;
	85	case IEEE802154_ADDR_LONG:
	86	if (mac_cb(skb)->dest.pan_id != span &&
	87	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	88	skb->pkt_type = PACKET_OTHERHOST;
863e88f2	89	else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
2a9820c9 AA	90	skb->pkt_type = PACKET_HOST;
	91	else
	92	skb->pkt_type = PACKET_OTHERHOST;
	93	break;
	94	case IEEE802154_ADDR_SHORT:
	95	if (mac_cb(skb)->dest.pan_id != span &&
	96	mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
	97	skb->pkt_type = PACKET_OTHERHOST;
	98	else if (mac_cb(skb)->dest.short_addr == sshort)
	99	skb->pkt_type = PACKET_HOST;
	100	else if (mac_cb(skb)->dest.short_addr ==
	101	cpu_to_le16(IEEE802154_ADDR_BROADCAST))
	102	skb->pkt_type = PACKET_BROADCAST;
	103	else
	104	skb->pkt_type = PACKET_OTHERHOST;
	105	break;
	106	default:
2a9820c9	107	pr_debug("invalid dest mode\n");
bcb47aab	108	goto fail;
2a9820c9 AA	109	}
2a9820c9 AA	110
2a9820c9 AA	111	skb->dev = sdata->dev;
2a9820c9 AA	112
d58a2fa9 AA	113	/* TODO this should be moved after netif_receive_skb call, otherwise
	114	* wireshark will show a mac header with security fields and the
	115	* payload is already decrypted.
	116	*/
2a9820c9 AA	117	rc = mac802154_llsec_decrypt(&sdata->sec, skb);
	118	if (rc) {
	119	pr_debug("decryption failed: %i\n", rc);
	120	goto fail;
	121	}
	122
	123	sdata->dev->stats.rx_packets++;
	124	sdata->dev->stats.rx_bytes += skb->len;
	125
	126	switch (mac_cb(skb)->type) {
ca1de81a	127	case IEEE802154_FC_TYPE_BEACON:
57588c71 MR	128	dev_dbg(&sdata->dev->dev, "BEACON received\n");
	129	if (!mac802154_is_scanning(sdata->local))
	130	goto fail;
	131
	132	mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC);
	133	if (!mac_pkt)
	134	goto fail;
	135
	136	mac_pkt->skb = skb_get(skb);
	137	mac_pkt->sdata = sdata;
	138	mac_pkt->page = sdata->local->scan_page;
	139	mac_pkt->channel = sdata->local->scan_channel;
	140	list_add_tail(&mac_pkt->node, &sdata->local->rx_beacon_list);
	141	queue_work(sdata->local->mac_wq, &sdata->local->rx_beacon_work);
	142	return NET_RX_SUCCESS;
ca1de81a AR	143	case IEEE802154_FC_TYPE_ACK:
	144	case IEEE802154_FC_TYPE_MAC_CMD:
	145	goto fail;
	146
2a9820c9	147	case IEEE802154_FC_TYPE_DATA:
08c511a7	148	return ieee802154_deliver_skb(skb);
2a9820c9	149	default:
bd89bb6d AR	150	pr_warn_ratelimited("ieee802154: bad frame received "
bd89bb6d AR	151	"(type = %d)\n", mac_cb(skb)->type);
2a9820c9 AA	152	goto fail;
	153	}
	154
	155	fail:
	156	kfree_skb(skb);
	157	return NET_RX_DROP;
	158	}
	159
be9d215f AA	160	static void
be9d215f AA	161	ieee802154_print_addr(const char name, const struct ieee802154_addr addr)
2a9820c9	162	{
3a22550a	163	if (addr->mode == IEEE802154_ADDR_NONE) {
2a9820c9	164	pr_debug("%s not present\n", name);
3a22550a MR	165	return;
3a22550a MR	166	}
2a9820c9 AA	167
	168	pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
	169	if (addr->mode == IEEE802154_ADDR_SHORT) {
	170	pr_debug("%s is short: %04x\n", name,
	171	le16_to_cpu(addr->short_addr));
	172	} else {
	173	u64 hw = swab64((__force u64)addr->extended_addr);
	174
	175	pr_debug("%s is hardware: %8phC\n", name, &hw);
	176	}
	177	}
	178
be9d215f AA	179	static int
be9d215f AA	180	ieee802154_parse_frame_start(struct sk_buff skb, struct ieee802154_hdr hdr)
2a9820c9 AA	181	{
2a9820c9 AA	182	int hlen;
5a5c4e06	183	struct ieee802154_mac_cb *cb = mac_cb(skb);
2a9820c9	184
9cf215d0 AA	185	skb_reset_mac_header(skb);
9cf215d0 AA	186
2a9820c9 AA	187	hlen = ieee802154_hdr_pull(skb, hdr);
	188	if (hlen < 0)
	189	return -EINVAL;
	190
	191	skb->mac_len = hlen;
	192
	193	pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
	194	hdr->seq);
	195
	196	cb->type = hdr->fc.type;
	197	cb->ackreq = hdr->fc.ack_request;
	198	cb->secen = hdr->fc.security_enabled;
	199
be9d215f AA	200	ieee802154_print_addr("destination", &hdr->dest);
be9d215f AA	201	ieee802154_print_addr("source", &hdr->source);
2a9820c9 AA	202
	203	cb->source = hdr->source;
	204	cb->dest = hdr->dest;
	205
	206	if (hdr->fc.security_enabled) {
	207	u64 key;
	208
	209	pr_debug("seclevel %i\n", hdr->sec.level);
	210
	211	switch (hdr->sec.key_id_mode) {
	212	case IEEE802154_SCF_KEY_IMPLICIT:
	213	pr_debug("implicit key\n");
	214	break;
	215
	216	case IEEE802154_SCF_KEY_INDEX:
	217	pr_debug("key %02x\n", hdr->sec.key_id);
	218	break;
	219
	220	case IEEE802154_SCF_KEY_SHORT_INDEX:
	221	pr_debug("key %04x:%04x %02x\n",
	222	le32_to_cpu(hdr->sec.short_src) >> 16,
	223	le32_to_cpu(hdr->sec.short_src) & 0xffff,
	224	hdr->sec.key_id);
	225	break;
	226
	227	case IEEE802154_SCF_KEY_HW_INDEX:
	228	key = swab64((__force u64)hdr->sec.extended_src);
	229	pr_debug("key source %8phC %02x\n", &key,
	230	hdr->sec.key_id);
	231	break;
	232	}
	233	}
	234
	235	return 0;
	236	}
	237
	238	static void
be9d215f AA	239	__ieee802154_rx_handle_packet(struct ieee802154_local *local,
be9d215f AA	240	struct sk_buff *skb)
2a9820c9 AA	241	{
	242	int ret;
	243	struct ieee802154_sub_if_data *sdata;
	244	struct ieee802154_hdr hdr;
2622e785	245	struct sk_buff *skb2;
2a9820c9	246
be9d215f	247	ret = ieee802154_parse_frame_start(skb, &hdr);
2a9820c9 AA	248	if (ret) {
2a9820c9 AA	249	pr_debug("got invalid frame\n");
2a9820c9 AA	250	return;
	251	}
	252
2a9820c9	253	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2622e785	254	if (sdata->wpan_dev.iftype == NL802154_IFTYPE_MONITOR)
1bc1754e VB	255	continue;
	256
	257	if (!ieee802154_sdata_running(sdata))
2a9820c9 AA	258	continue;
2a9820c9 AA	259
0218277d MR	260	/* Do not deliver packets received on interfaces expecting
	261	* AACK=1 if the address filters where disabled.
	262	*/
	263	if (local->hw.phy->filtering < IEEE802154_FILTERING_4_FRAME_FIELDS &&
	264	sdata->required_filtering == IEEE802154_FILTERING_4_FRAME_FIELDS)
	265	continue;
	266
2622e785 MR	267	skb2 = skb_clone(skb, GFP_ATOMIC);
	268	if (skb2) {
	269	skb2->dev = sdata->dev;
	270	ieee802154_subif_frame(sdata, skb2, &hdr);
	271	}
2a9820c9	272	}
2a9820c9 AA	273	}
2a9820c9 AA	274
4ca18be5	275	static void
be9d215f	276	ieee802154_monitors_rx(struct ieee802154_local local, struct sk_buff skb)
2a9820c9 AA	277	{
	278	struct sk_buff *skb2;
	279	struct ieee802154_sub_if_data *sdata;
2a9820c9	280
9cf215d0	281	skb_reset_mac_header(skb);
75a46f0e	282	skb->ip_summed = CHECKSUM_UNNECESSARY;
c9ca6401	283	skb->pkt_type = PACKET_OTHERHOST;
702dcf99 AA	284	skb->protocol = htons(ETH_P_IEEE802154);
702dcf99 AA	285
2a9820c9	286	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
ed65963b	287	if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR)
20b48120 AA	288	continue;
	289
	290	if (!ieee802154_sdata_running(sdata))
2a9820c9 AA	291	continue;
	292
	293	skb2 = skb_clone(skb, GFP_ATOMIC);
05f7de67 AA	294	if (skb2) {
	295	skb2->dev = sdata->dev;
	296	ieee802154_deliver_skb(skb2);
2a9820c9	297
05f7de67 AA	298	sdata->dev->stats.rx_packets++;
	299	sdata->dev->stats.rx_bytes += skb->len;
	300	}
2a9820c9	301	}
2a9820c9 AA	302	}
2a9820c9 AA	303
d10270ce	304	void ieee802154_rx(struct ieee802154_local local, struct sk_buff skb)
1cd829c8	305	{
ec718f3d	306	u16 crc;
1cd829c8	307
469100d6 AA	308	WARN_ON_ONCE(softirq_count() == 0);
469100d6 AA	309
3cf24cf8	310	if (local->suspended)
4d1c7d87	311	goto free_skb;
3cf24cf8	312
b7889497 AA	313	/* TODO: When a transceiver omits the checksum here, we
	314	* add an own calculated one. This is currently an ugly
	315	* solution because the monitor needs a crc here.
	316	*/
	317	if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
ec718f3d	318	crc = crc_ccitt(0, skb->data, skb->len);
b7889497	319	put_unaligned_le16(crc, skb_put(skb, 2));
1cd829c8	320	}
1cd829c8	321
e176b681 AA	322	rcu_read_lock();
e176b681 AA	323
be9d215f	324	ieee802154_monitors_rx(local, skb);
2d3b5b0a	325
a4b5b4c5 MR	326	/* Level 1 filtering: Check the FCS by software when relevant */
a4b5b4c5 MR	327	if (local->hw.phy->filtering == IEEE802154_FILTERING_NONE) {
ec718f3d	328	crc = crc_ccitt(0, skb->data, skb->len);
4d1c7d87	329	if (crc)
3cf24cf8	330	goto drop;
ec718f3d	331	}
b7889497 AA	332	/* remove crc */
b7889497 AA	333	skb_trim(skb, skb->len - 2);
e176b681	334
b7889497	335	__ieee802154_rx_handle_packet(local, skb);
2d3b5b0a	336
3cf24cf8	337	drop:
4d1c7d87 MR	338	rcu_read_unlock();
4d1c7d87 MR	339	free_skb:
3cf24cf8	340	kfree_skb(skb);
1cd829c8	341	}
1cd829c8	342
1cd829c8	343	void
5a504397	344	ieee802154_rx_irqsafe(struct ieee802154_hw hw, struct sk_buff skb, u8 lqi)
1cd829c8	345	{
60741361	346	struct ieee802154_local *local = hw_to_local(hw);
5a5c4e06	347	struct ieee802154_mac_cb *cb = mac_cb_init(skb);
1cd829c8	348
5a5c4e06	349	cb->lqi = lqi;
c5c47e67 AA	350	skb->pkt_type = IEEE802154_RX_MSG;
	351	skb_queue_tail(&local->skb_queue, skb);
	352	tasklet_schedule(&local->tasklet);
1cd829c8	353	}
1cd829c8	354	EXPORT_SYMBOL(ieee802154_rx_irqsafe);