ieee802154: change _cb handling slightly
The current mac_cb handling of ieee802154 is rather awkward and limited.
Decompose the single flags field into multiple fields with the meanings
of each subfield of the flags field to make future extensions (for
example, link-layer security) easier. Also don't set the frame sequence
number in upper layers, since that's a thing the MAC is supposed to set
on frame transmit - we set it on header creation, but assuming that
upper layers do not blindly duplicate our headers, this is fine.
Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h
index 6e4d3e1..bc9a747 100644
--- a/include/net/ieee802154_netdev.h
+++ b/include/net/ieee802154_netdev.h
@@ -222,8 +222,9 @@
*/
struct ieee802154_mac_cb {
u8 lqi;
- u8 flags;
- u8 seq;
+ u8 type;
+ bool ackreq;
+ bool secen;
struct ieee802154_addr source;
struct ieee802154_addr dest;
};
@@ -233,24 +234,12 @@
return (struct ieee802154_mac_cb *)skb->cb;
}
-#define MAC_CB_FLAG_TYPEMASK ((1 << 3) - 1)
-
-#define MAC_CB_FLAG_ACKREQ (1 << 3)
-#define MAC_CB_FLAG_SECEN (1 << 4)
-
-static inline bool mac_cb_is_ackreq(struct sk_buff *skb)
+static inline struct ieee802154_mac_cb *mac_cb_init(struct sk_buff *skb)
{
- return mac_cb(skb)->flags & MAC_CB_FLAG_ACKREQ;
-}
+ BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
-static inline bool mac_cb_is_secen(struct sk_buff *skb)
-{
- return mac_cb(skb)->flags & MAC_CB_FLAG_SECEN;
-}
-
-static inline int mac_cb_type(struct sk_buff *skb)
-{
- return mac_cb(skb)->flags & MAC_CB_FLAG_TYPEMASK;
+ memset(skb->cb, 0, sizeof(struct ieee802154_mac_cb));
+ return mac_cb(skb);
}
#define IEEE802154_MAC_SCAN_ED 0
diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c
index 0f5a69e..d0191c5 100644
--- a/net/ieee802154/6lowpan_rtnl.c
+++ b/net/ieee802154/6lowpan_rtnl.c
@@ -92,6 +92,7 @@
const u8 *saddr = _saddr;
const u8 *daddr = _daddr;
struct ieee802154_addr sa, da;
+ struct ieee802154_mac_cb *cb = mac_cb_init(skb);
/* TODO:
* if this package isn't ipv6 one, where should it be routed?
@@ -115,8 +116,7 @@
* from MAC subif of the 'dev' and 'real_dev' network devices, but
* this isn't implemented in mainline yet, so currently we assign 0xff
*/
- mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
- mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
+ cb->type = IEEE802154_FC_TYPE_DATA;
/* prepare wpan address data */
sa.mode = IEEE802154_ADDR_LONG;
@@ -135,11 +135,10 @@
} else {
da.mode = IEEE802154_ADDR_LONG;
da.extended_addr = ieee802154_devaddr_from_raw(daddr);
-
- /* request acknowledgment */
- mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
}
+ cb->ackreq = !lowpan_is_addr_broadcast(daddr);
+
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
type, (void *)&da, (void *)&sa, 0);
}
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index 786437b..d95e2e1b 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -209,6 +209,7 @@
struct net_device *dev;
unsigned int mtu;
struct sk_buff *skb;
+ struct ieee802154_mac_cb *cb;
struct dgram_sock *ro = dgram_sk(sk);
int hlen, tlen;
int err;
@@ -249,18 +250,15 @@
skb_reset_network_header(skb);
- mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
- if (ro->want_ack)
- mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
+ cb = mac_cb_init(skb);
+ cb->type = IEEE802154_FC_TYPE_DATA;
+ cb->ackreq = ro->want_ack;
- mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
err = dev_hard_header(skb, dev, ETH_P_IEEE802154, &ro->dst_addr,
ro->bound ? &ro->src_addr : NULL, size);
if (err < 0)
goto out_skb;
- skb_reset_mac_header(skb);
-
err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
if (err < 0)
goto out_skb;
diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
index 03855b0..0597b96 100644
--- a/net/mac802154/rx.c
+++ b/net/mac802154/rx.c
@@ -59,8 +59,6 @@
skb->protocol = htons(ETH_P_IEEE802154);
skb_reset_mac_header(skb);
- BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
-
if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
u16 crc;
diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index cb34064..bb49e88 100644
--- a/net/mac802154/wpan.c
+++ b/net/mac802154/wpan.c
@@ -192,15 +192,17 @@
{
struct ieee802154_hdr hdr;
struct mac802154_sub_if_data *priv = netdev_priv(dev);
+ struct ieee802154_mac_cb *cb = mac_cb(skb);
int hlen;
if (!daddr)
return -EINVAL;
memset(&hdr.fc, 0, sizeof(hdr.fc));
- hdr.fc.type = mac_cb_type(skb);
- hdr.fc.security_enabled = mac_cb_is_secen(skb);
- hdr.fc.ack_request = mac_cb_is_ackreq(skb);
+ hdr.fc.type = cb->type;
+ hdr.fc.security_enabled = cb->secen;
+ hdr.fc.ack_request = cb->ackreq;
+ hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
if (!saddr) {
spin_lock_bh(&priv->mib_lock);
@@ -391,12 +393,12 @@
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
- switch (mac_cb_type(skb)) {
+ 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_type(skb));
+ mac_cb(skb)->type);
kfree_skb(skb);
return NET_RX_DROP;
}
@@ -423,6 +425,7 @@
{
int hlen;
struct ieee802154_hdr hdr;
+ struct ieee802154_mac_cb *cb = mac_cb_init(skb);
hlen = ieee802154_hdr_pull(skb, &hdr);
if (hlen < 0)
@@ -433,18 +436,15 @@
pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr.fc),
hdr.seq);
- mac_cb(skb)->flags = hdr.fc.type;
-
- if (hdr.fc.ack_request)
- mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
- if (hdr.fc.security_enabled)
- mac_cb(skb)->flags |= MAC_CB_FLAG_SECEN;
+ 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);
- mac_cb(skb)->source = hdr.source;
- mac_cb(skb)->dest = hdr.dest;
+ cb->source = hdr.source;
+ cb->dest = hdr.dest;
if (hdr.fc.security_enabled) {
u64 key;