| // 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; |
| __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; |
| |
| 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: |
| 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); |
| |
| 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->wpan_dev.iftype != NL802154_IFTYPE_NODE) |
| continue; |
| |
| if (!ieee802154_sdata_running(sdata)) |
| continue; |
| |
| ieee802154_subif_frame(sdata, skb, &hdr); |
| skb = NULL; |
| break; |
| } |
| |
| 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->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 drop; |
| |
| /* 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(); |
| goto drop; |
| } |
| } |
| /* remove crc */ |
| skb_trim(skb, skb->len - 2); |
| |
| __ieee802154_rx_handle_packet(local, skb); |
| |
| rcu_read_unlock(); |
| |
| return; |
| drop: |
| 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); |
| |
| 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); |