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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
303 lines
7.1 KiB
C
303 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007-2012 Siemens AG
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*
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* Written by:
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* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/crc-ccitt.h>
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#include <asm/unaligned.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/nl802154.h>
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#include "ieee802154_i.h"
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static int ieee802154_deliver_skb(struct sk_buff *skb)
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{
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->protocol = htons(ETH_P_IEEE802154);
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return netif_receive_skb(skb);
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}
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static int
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ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
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struct sk_buff *skb, const struct ieee802154_hdr *hdr)
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{
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struct wpan_dev *wpan_dev = &sdata->wpan_dev;
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__le16 span, sshort;
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int rc;
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pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
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span = wpan_dev->pan_id;
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sshort = wpan_dev->short_addr;
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switch (mac_cb(skb)->dest.mode) {
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case IEEE802154_ADDR_NONE:
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if (mac_cb(skb)->dest.mode != IEEE802154_ADDR_NONE)
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/* FIXME: check if we are PAN coordinator */
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skb->pkt_type = PACKET_OTHERHOST;
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else
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/* ACK comes with both addresses empty */
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skb->pkt_type = PACKET_HOST;
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break;
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case IEEE802154_ADDR_LONG:
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if (mac_cb(skb)->dest.pan_id != span &&
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mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
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skb->pkt_type = PACKET_OTHERHOST;
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else if (mac_cb(skb)->dest.extended_addr == wpan_dev->extended_addr)
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skb->pkt_type = PACKET_HOST;
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else
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skb->pkt_type = PACKET_OTHERHOST;
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break;
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case IEEE802154_ADDR_SHORT:
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if (mac_cb(skb)->dest.pan_id != span &&
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mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
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skb->pkt_type = PACKET_OTHERHOST;
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else if (mac_cb(skb)->dest.short_addr == sshort)
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skb->pkt_type = PACKET_HOST;
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else if (mac_cb(skb)->dest.short_addr ==
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cpu_to_le16(IEEE802154_ADDR_BROADCAST))
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skb->pkt_type = PACKET_BROADCAST;
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else
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skb->pkt_type = PACKET_OTHERHOST;
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break;
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default:
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pr_debug("invalid dest mode\n");
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goto fail;
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}
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skb->dev = sdata->dev;
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/* TODO this should be moved after netif_receive_skb call, otherwise
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* wireshark will show a mac header with security fields and the
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* payload is already decrypted.
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*/
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rc = mac802154_llsec_decrypt(&sdata->sec, skb);
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if (rc) {
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pr_debug("decryption failed: %i\n", rc);
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goto fail;
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}
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sdata->dev->stats.rx_packets++;
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sdata->dev->stats.rx_bytes += skb->len;
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switch (mac_cb(skb)->type) {
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case IEEE802154_FC_TYPE_BEACON:
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case IEEE802154_FC_TYPE_ACK:
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case IEEE802154_FC_TYPE_MAC_CMD:
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goto fail;
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case IEEE802154_FC_TYPE_DATA:
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return ieee802154_deliver_skb(skb);
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default:
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pr_warn_ratelimited("ieee802154: bad frame received "
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"(type = %d)\n", mac_cb(skb)->type);
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goto fail;
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}
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fail:
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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static void
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ieee802154_print_addr(const char *name, const struct ieee802154_addr *addr)
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{
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if (addr->mode == IEEE802154_ADDR_NONE)
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pr_debug("%s not present\n", name);
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pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
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if (addr->mode == IEEE802154_ADDR_SHORT) {
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pr_debug("%s is short: %04x\n", name,
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le16_to_cpu(addr->short_addr));
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} else {
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u64 hw = swab64((__force u64)addr->extended_addr);
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pr_debug("%s is hardware: %8phC\n", name, &hw);
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}
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}
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static int
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ieee802154_parse_frame_start(struct sk_buff *skb, struct ieee802154_hdr *hdr)
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{
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int hlen;
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struct ieee802154_mac_cb *cb = mac_cb_init(skb);
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skb_reset_mac_header(skb);
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hlen = ieee802154_hdr_pull(skb, hdr);
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if (hlen < 0)
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return -EINVAL;
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skb->mac_len = hlen;
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pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
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hdr->seq);
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cb->type = hdr->fc.type;
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cb->ackreq = hdr->fc.ack_request;
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cb->secen = hdr->fc.security_enabled;
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ieee802154_print_addr("destination", &hdr->dest);
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ieee802154_print_addr("source", &hdr->source);
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cb->source = hdr->source;
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cb->dest = hdr->dest;
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if (hdr->fc.security_enabled) {
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u64 key;
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pr_debug("seclevel %i\n", hdr->sec.level);
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switch (hdr->sec.key_id_mode) {
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case IEEE802154_SCF_KEY_IMPLICIT:
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pr_debug("implicit key\n");
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break;
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case IEEE802154_SCF_KEY_INDEX:
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pr_debug("key %02x\n", hdr->sec.key_id);
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break;
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case IEEE802154_SCF_KEY_SHORT_INDEX:
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pr_debug("key %04x:%04x %02x\n",
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le32_to_cpu(hdr->sec.short_src) >> 16,
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le32_to_cpu(hdr->sec.short_src) & 0xffff,
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hdr->sec.key_id);
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break;
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case IEEE802154_SCF_KEY_HW_INDEX:
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key = swab64((__force u64)hdr->sec.extended_src);
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pr_debug("key source %8phC %02x\n", &key,
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hdr->sec.key_id);
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break;
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}
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}
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return 0;
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}
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static void
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__ieee802154_rx_handle_packet(struct ieee802154_local *local,
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struct sk_buff *skb)
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{
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int ret;
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struct ieee802154_sub_if_data *sdata;
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struct ieee802154_hdr hdr;
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ret = ieee802154_parse_frame_start(skb, &hdr);
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if (ret) {
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pr_debug("got invalid frame\n");
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kfree_skb(skb);
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return;
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}
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->wpan_dev.iftype != NL802154_IFTYPE_NODE)
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continue;
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if (!ieee802154_sdata_running(sdata))
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continue;
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ieee802154_subif_frame(sdata, skb, &hdr);
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skb = NULL;
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break;
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}
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kfree_skb(skb);
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}
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static void
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ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
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{
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struct sk_buff *skb2;
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struct ieee802154_sub_if_data *sdata;
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skb_reset_mac_header(skb);
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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skb->pkt_type = PACKET_OTHERHOST;
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skb->protocol = htons(ETH_P_IEEE802154);
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->wpan_dev.iftype != NL802154_IFTYPE_MONITOR)
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continue;
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if (!ieee802154_sdata_running(sdata))
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continue;
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skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2) {
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skb2->dev = sdata->dev;
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ieee802154_deliver_skb(skb2);
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sdata->dev->stats.rx_packets++;
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sdata->dev->stats.rx_bytes += skb->len;
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}
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}
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}
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void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb)
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{
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u16 crc;
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WARN_ON_ONCE(softirq_count() == 0);
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if (local->suspended)
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goto drop;
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/* TODO: When a transceiver omits the checksum here, we
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* add an own calculated one. This is currently an ugly
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* solution because the monitor needs a crc here.
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*/
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if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
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crc = crc_ccitt(0, skb->data, skb->len);
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put_unaligned_le16(crc, skb_put(skb, 2));
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}
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rcu_read_lock();
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ieee802154_monitors_rx(local, skb);
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/* Check if transceiver doesn't validate the checksum.
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* If not we validate the checksum here.
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*/
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if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
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crc = crc_ccitt(0, skb->data, skb->len);
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if (crc) {
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rcu_read_unlock();
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goto drop;
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}
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}
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/* remove crc */
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skb_trim(skb, skb->len - 2);
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__ieee802154_rx_handle_packet(local, skb);
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rcu_read_unlock();
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return;
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drop:
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kfree_skb(skb);
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}
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void
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ieee802154_rx_irqsafe(struct ieee802154_hw *hw, struct sk_buff *skb, u8 lqi)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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mac_cb(skb)->lqi = lqi;
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skb->pkt_type = IEEE802154_RX_MSG;
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skb_queue_tail(&local->skb_queue, skb);
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tasklet_schedule(&local->tasklet);
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}
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EXPORT_SYMBOL(ieee802154_rx_irqsafe);
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