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-rw-r--r--net/mac802154/rx.c479
1 files changed, 407 insertions, 72 deletions
diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
index 38548ec2098f..aac359b5c71d 100644
--- a/net/mac802154/rx.c
+++ b/net/mac802154/rx.c
@@ -1,19 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
* Written by:
* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
@@ -23,93 +11,440 @@
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/workqueue.h>
#include <linux/netdevice.h>
#include <linux/crc-ccitt.h>
+#include <linux/unaligned.h>
#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
+#include <net/nl802154.h>
-#include "mac802154.h"
+#include "ieee802154_i.h"
-/* The IEEE 802.15.4 standard defines 4 MAC packet types:
- * - beacon frame
- * - MAC command frame
- * - acknowledgement frame
- * - data frame
- *
- * and only the data frame should be pushed to the upper layers, other types
- * are just internal MAC layer management information. So only data packets
- * are going to be sent to the networking queue, all other will be processed
- * right here by using the device workqueue.
- */
-struct rx_work {
- struct sk_buff *skb;
- struct work_struct work;
- struct ieee802154_dev *dev;
- u8 lqi;
-};
+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 bool mac802154_should_answer_beacon_req(struct ieee802154_local *local)
+{
+ struct cfg802154_beacon_request *beacon_req;
+ unsigned int interval;
+
+ rcu_read_lock();
+ beacon_req = rcu_dereference(local->beacon_req);
+ if (!beacon_req) {
+ rcu_read_unlock();
+ return false;
+ }
+
+ interval = beacon_req->interval;
+ rcu_read_unlock();
+
+ if (!mac802154_is_beaconing(local))
+ return false;
+
+ return interval == IEEE802154_ACTIVE_SCAN_DURATION;
+}
+
+void mac802154_rx_mac_cmd_worker(struct work_struct *work)
+{
+ struct ieee802154_local *local =
+ container_of(work, struct ieee802154_local, rx_mac_cmd_work);
+ struct cfg802154_mac_pkt *mac_pkt;
+ u8 mac_cmd;
+ int rc;
+
+ mac_pkt = list_first_entry_or_null(&local->rx_mac_cmd_list,
+ struct cfg802154_mac_pkt, node);
+ if (!mac_pkt)
+ return;
+
+ rc = ieee802154_get_mac_cmd(mac_pkt->skb, &mac_cmd);
+ if (rc)
+ goto out;
+
+ switch (mac_cmd) {
+ case IEEE802154_CMD_BEACON_REQ:
+ dev_dbg(&mac_pkt->sdata->dev->dev, "processing BEACON REQ\n");
+ if (!mac802154_should_answer_beacon_req(local))
+ break;
+
+ queue_delayed_work(local->mac_wq, &local->beacon_work, 0);
+ break;
+
+ case IEEE802154_CMD_ASSOCIATION_RESP:
+ dev_dbg(&mac_pkt->sdata->dev->dev, "processing ASSOC RESP\n");
+ if (!mac802154_is_associating(local))
+ break;
+
+ mac802154_process_association_resp(mac_pkt->sdata, mac_pkt->skb);
+ break;
+
+ case IEEE802154_CMD_ASSOCIATION_REQ:
+ dev_dbg(&mac_pkt->sdata->dev->dev, "processing ASSOC REQ\n");
+ if (mac_pkt->sdata->wpan_dev.iftype != NL802154_IFTYPE_COORD)
+ break;
+
+ mac802154_process_association_req(mac_pkt->sdata, mac_pkt->skb);
+ break;
+
+ case IEEE802154_CMD_DISASSOCIATION_NOTIFY:
+ dev_dbg(&mac_pkt->sdata->dev->dev, "processing DISASSOC NOTIF\n");
+ if (mac_pkt->sdata->wpan_dev.iftype != NL802154_IFTYPE_COORD)
+ break;
+
+ mac802154_process_disassociation_notif(mac_pkt->sdata, mac_pkt->skb);
+ break;
+
+ default:
+ break;
+ }
+
+out:
+ 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)
+ /* ACK comes with both addresses empty */
+ skb->pkt_type = PACKET_HOST;
+ else if (!wpan_dev->parent)
+ /* No dest means PAN coordinator is the recipient */
+ skb->pkt_type = PACKET_HOST;
+ else
+ /* We are not the PAN coordinator, just relaying */
+ skb->pkt_type = PACKET_OTHERHOST;
+ 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_MAC_CMD:
+ dev_dbg(&sdata->dev->dev, "MAC COMMAND received\n");
+ mac_pkt = kzalloc(sizeof(*mac_pkt), GFP_ATOMIC);
+ if (!mac_pkt)
+ goto fail;
+
+ mac_pkt->skb = skb_get(skb);
+ mac_pkt->sdata = sdata;
+ list_add_tail(&mac_pkt->node, &sdata->local->rx_mac_cmd_list);
+ queue_work(sdata->local->mac_wq, &sdata->local->rx_mac_cmd_work);
+ return NET_RX_SUCCESS;
+
+ case IEEE802154_FC_TYPE_ACK:
+ 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
-mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi)
+ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
{
- struct mac802154_priv *priv = mac802154_to_priv(hw);
+ 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);
- mac_cb(skb)->lqi = lqi;
- skb->protocol = htons(ETH_P_IEEE802154);
skb_reset_mac_header(skb);
- BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
+ hlen = ieee802154_hdr_pull(skb, hdr);
+ if (hlen < 0)
+ return -EINVAL;
- if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
- u16 crc;
+ skb->mac_len = hlen;
- if (skb->len < 2) {
- pr_debug("got invalid frame\n");
- goto out;
- }
- crc = crc_ccitt(0, skb->data, skb->len);
- if (crc) {
- pr_debug("CRC mismatch\n");
- goto out;
+ 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;
}
- skb_trim(skb, skb->len - 2); /* CRC */
}
- mac802154_monitors_rx(priv, skb);
- mac802154_wpans_rx(priv, skb);
-out:
- dev_kfree_skb(skb);
- return;
+ 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 mac802154_rx_worker(struct work_struct *work)
+static void
+ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
{
- struct rx_work *rw = container_of(work, struct rx_work, work);
- struct sk_buff *skb = rw->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;
- mac802154_subif_rx(rw->dev, skb, rw->lqi);
- kfree(rw);
+ 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_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
+void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb)
{
- struct mac802154_priv *priv = mac802154_to_priv(dev);
- struct rx_work *work;
+ u16 crc;
- if (!skb)
- return;
+ WARN_ON_ONCE(softirq_count() == 0);
- work = kzalloc(sizeof(struct rx_work), GFP_ATOMIC);
- if (!work)
- return;
+ 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();
- INIT_WORK(&work->work, mac802154_rx_worker);
- work->skb = skb;
- work->dev = dev;
- work->lqi = lqi;
+ 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);
- queue_work(priv->dev_workqueue, &work->work);
+ 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);
generated by cgit (git 2.34.1) at 2025-12-25 07:34:47 +0000