From 32edc40ae65cf84e1ab69f6f8316ce81559e115d Mon Sep 17 00:00:00 2001 From: Phoebe Buckheister Date: Wed, 14 May 2014 17:43:08 +0200 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- include/net/ieee802154_netdev.h | 25 +++++++------------------ net/ieee802154/6lowpan_rtnl.c | 9 ++++----- net/ieee802154/dgram.c | 10 ++++------ net/mac802154/rx.c | 2 -- net/mac802154/wpan.c | 26 +++++++++++++------------- 5 files changed, 28 insertions(+), 44 deletions(-) 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 @@ static inline void ieee802154_addr_to_sa(struct ieee802154_addr_sa *sa, */ 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 @@ static inline struct ieee802154_mac_cb *mac_cb(struct sk_buff *skb) 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) -{ - return mac_cb(skb)->flags & MAC_CB_FLAG_ACKREQ; -} - -static inline bool mac_cb_is_secen(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_SECEN; -} + BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb)); -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 @@ static int lowpan_header_create(struct sk_buff *skb, 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 @@ static int lowpan_header_create(struct sk_buff *skb, * 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 @@ static int lowpan_header_create(struct sk_buff *skb, } 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 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, 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 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk, 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 @@ mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi) 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 @@ static int mac802154_header_create(struct sk_buff *skb, { 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 @@ mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb) 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 @@ static int mac802154_parse_frame_start(struct sk_buff *skb) { 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 @@ static int mac802154_parse_frame_start(struct sk_buff *skb) 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; -- 2.7.4