2a9820c9e2
This patch removes all relevant receiving functions inclusive frame parsing into rx file. Like mac80211 we should implement the complete receive handling and parsing in this file. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
295 lines
7.0 KiB
C
295 lines
7.0 KiB
C
/*
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* Copyright (C) 2007-2012 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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 <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/rtnetlink.h>
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#include <linux/nl802154.h>
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#include "ieee802154_i.h"
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static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
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{
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return netif_receive_skb(skb);
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}
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static int
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mac802154_subif_frame(struct ieee802154_sub_if_data *sdata, struct sk_buff *skb,
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const struct ieee802154_hdr *hdr)
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{
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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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spin_lock_bh(&sdata->mib_lock);
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span = sdata->pan_id;
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sshort = sdata->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 == sdata->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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spin_unlock_bh(&sdata->mib_lock);
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pr_debug("invalid dest mode\n");
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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spin_unlock_bh(&sdata->mib_lock);
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skb->dev = sdata->dev;
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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_DATA:
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return mac802154_process_data(sdata->dev, skb);
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default:
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pr_warn("ieee802154: bad frame received (type = %d)\n",
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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 mac802154_print_addr(const char *name,
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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 mac802154_parse_frame_start(struct sk_buff *skb,
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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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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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mac802154_print_addr("destination", &hdr->dest);
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mac802154_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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mac802154_wpans_rx(struct ieee802154_local *local, 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 = mac802154_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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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->type != IEEE802154_DEV_WPAN ||
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!netif_running(sdata->dev))
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continue;
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mac802154_subif_frame(sdata, skb, &hdr);
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skb = NULL;
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break;
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}
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rcu_read_unlock();
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if (skb)
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kfree_skb(skb);
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}
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void mac802154_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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u16 crc = crc_ccitt(0, skb->data, skb->len);
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u8 *data;
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rcu_read_lock();
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list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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if (sdata->type != IEEE802154_DEV_MONITOR ||
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!netif_running(sdata->dev))
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continue;
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skb2 = skb_clone(skb, GFP_ATOMIC);
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skb2->dev = sdata->dev;
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skb2->pkt_type = PACKET_HOST;
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data = skb_put(skb2, 2);
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data[0] = crc & 0xff;
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data[1] = crc >> 8;
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netif_rx_ni(skb2);
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}
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rcu_read_unlock();
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}
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static void
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mac802154_subif_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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skb->protocol = htons(ETH_P_IEEE802154);
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skb_reset_mac_header(skb);
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if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
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u16 crc;
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if (skb->len < 2) {
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pr_debug("got invalid frame\n");
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goto fail;
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}
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crc = crc_ccitt(0, skb->data, skb->len);
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if (crc) {
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pr_debug("CRC mismatch\n");
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goto fail;
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}
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skb_trim(skb, skb->len - 2); /* CRC */
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}
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mac802154_monitors_rx(local, skb);
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mac802154_wpans_rx(local, skb);
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return;
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fail:
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kfree_skb(skb);
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}
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void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
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{
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WARN_ON_ONCE(softirq_count() == 0);
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mac802154_subif_rx(hw, skb);
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}
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EXPORT_SYMBOL(ieee802154_rx);
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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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