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303 lines
7.1 KiB
303 lines
7.1 KiB
// 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 <[email protected]> |
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* Maxim Gorbachyov <[email protected]> |
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* Dmitry Eremin-Solenikov <[email protected]> |
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* Alexander Smirnov <[email protected]> |
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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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