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linux/net/mac802154/rx.c
Miquel Raynal e9dc1bc9b8 mac802154: Use the PAN coordinator parameter when stamping packets 
ACKs come with the source and destination address empty, this has been
clarified already. But there is something else: if the destination
address is empty but the source address is valid, it may be a way to
reach the PAN coordinator. Either the device receiving this frame is the
PAN coordinator itself and should process what it just received
(PACKET_HOST) or it is not and may, if supported, relay the packet as it
is targeted to another device in the network.

Right now we do not support relaying so the packet should be dropped in
the first place, but the stamping looks more accurate this way.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/linux-wpan/20231128111655.507479-3-miquel.raynal@bootlin.com
2023-12-15 11:14:51 +01:00

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// 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 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
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);
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