mac802154: rx: move receive handling into rx.c

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>

1 files changed, 214 insertions, 0 deletions

diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
index c4df3210c5e6..d8498c5fc297 100644
--- a/net/mac802154/rx.c
+++ b/net/mac802154/rx.c
@@ -24,9 +24,223 @@
 
 #include <net/mac802154.h>
 #include <net/ieee802154_netdev.h>
+#include <net/rtnetlink.h>
+#include <linux/nl802154.h>
 
 #include "ieee802154_i.h"
 
+static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
+{
+        return netif_receive_skb(skb);
+}
+
+static int
+mac802154_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 mac802154_process_data(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 mac802154_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 mac802154_parse_frame_start(struct sk_buff *skb,
+                                       struct ieee802154_hdr *hdr)
+{
+        int hlen;
+        struct ieee802154_mac_cb *cb = mac_cb_init(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;
+
+        mac802154_print_addr("destination", &hdr->dest);
+        mac802154_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
+mac802154_wpans_rx(struct ieee802154_local *local, struct sk_buff *skb)
+{
+        int ret;
+        struct ieee802154_sub_if_data *sdata;
+        struct ieee802154_hdr hdr;
+
+        ret = mac802154_parse_frame_start(skb, &hdr);
+        if (ret) {
+                pr_debug("got invalid frame\n");
+                kfree_skb(skb);
+                return;
+        }
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+                if (sdata->type != IEEE802154_DEV_WPAN ||
+                    !netif_running(sdata->dev))
+                        continue;
+
+                mac802154_subif_frame(sdata, skb, &hdr);
+                skb = NULL;
+                break;
+        }
+        rcu_read_unlock();
+
+        if (skb)
+                kfree_skb(skb);
+}
+
+void mac802154_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;
+
+        rcu_read_lock();
+        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);
+        }
+        rcu_read_unlock();
+}
+
 static void
 mac802154_subif_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
 {