/* * Copyright (C) 2007-2012 Siemens AG * * 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. * * Written by: * Pavel Smolenskiy * Maxim Gorbachyov * Dmitry Eremin-Solenikov * Alexander Smirnov */ #include #include #include #include #include #include #include #include #include "ieee802154_i.h" static int ieee802154_deliver_skb(struct net_device *dev, 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) { __le16 span, sshort; int rc; pr_debug("getting packet via slave interface %s\n", sdata->dev->name); spin_lock_bh(&sdata->mib_lock); span = sdata->pan_id; sshort = sdata->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 == sdata->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: spin_unlock_bh(&sdata->mib_lock); pr_debug("invalid dest mode\n"); kfree_skb(skb); return NET_RX_DROP; } spin_unlock_bh(&sdata->mib_lock); skb->dev = sdata->dev; 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_DATA: return ieee802154_deliver_skb(sdata->dev, skb); default: pr_warn("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->type != IEEE802154_DEV_WPAN || !netif_running(sdata->dev)) continue; ieee802154_subif_frame(sdata, skb, &hdr); skb = NULL; break; } if (skb) 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; u16 crc = crc_ccitt(0, skb->data, skb->len); u8 *data; 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->type != IEEE802154_DEV_MONITOR || !netif_running(sdata->dev)) continue; skb2 = skb_clone(skb, GFP_ATOMIC); skb2->dev = sdata->dev; skb2->pkt_type = PACKET_HOST; data = skb_put(skb2, 2); data[0] = crc & 0xff; data[1] = crc >> 8; netif_rx_ni(skb2); } } void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb) { struct ieee802154_local *local = hw_to_local(hw); WARN_ON_ONCE(softirq_count() == 0); if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { u16 crc; if (skb->len < 2) { pr_debug("got invalid frame\n"); goto fail; } crc = crc_ccitt(0, skb->data, skb->len); if (crc) { pr_debug("CRC mismatch\n"); goto fail; } skb_trim(skb, skb->len - 2); /* CRC */ } rcu_read_lock(); ieee802154_monitors_rx(local, skb); __ieee802154_rx_handle_packet(local, skb); rcu_read_unlock(); return; fail: kfree_skb(skb); } EXPORT_SYMBOL(ieee802154_rx); 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);