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ieee802154: introduce wpan_dev_header_ops

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The current header_ops callback structure of net device are used mostly
from 802.15.4 upper-layers. Because this callback structure is a very
generic one, which is also used by e.g. DGRAM AF_PACKET sockets, we
can't make this callback structure 802.15.4 specific which is currently
is.

I saw the smallest "constraint" for calling this callback with
dev_hard_header/dev_parse_header by AF_PACKET which assign a 8 byte
array for address void pointers. Currently 802.15.4 specific protocols
like af802154 and 6LoWPAN will assign the "struct ieee802154_addr" as
these parameters which is greater than 8 bytes. The current callback
implementation for header_ops.create assumes always a complete
"struct ieee802154_addr" which AF_PACKET can't never handled and is
greater than 8 bytes.

For that reason we introduce now a "generic" create/parse header_ops
callback which allows handling with intra-pan extended addresses only.
This allows a small use-case with AF_PACKET to send "somehow" a valid
dataframe over DGRAM.

To keeping the current dev_hard_header behaviour we introduce a similar
callback structure "wpan_dev_header_ops" which contains 802.15.4 specific
upper-layer header creation functionality, which can be called by
wpan_dev_hard_header.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring
2015-09-18 11:30:42 +02:00
committed by Marcel Holtmann
parent a1da67b811
commit 838b83d63d
5 changed files with 118 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
include/net/cfg802154.h
View File

@@ -167,6 +167,26 @@ struct wpan_phy {
char priv[0] __aligned(NETDEV_ALIGN);
};
struct ieee802154_addr {
u8 mode;
__le16 pan_id;
union {
__le16 short_addr;
__le64 extended_addr;
};
};
struct wpan_dev_header_ops {
/* TODO create callback currently assumes ieee802154_mac_cb inside
* skb->cb. This should be changed to give these information as
* parameter.
*/
int (*create)(struct sk_buff *skb, struct net_device *dev,
const struct ieee802154_addr *daddr,
const struct ieee802154_addr *saddr,
unsigned int len);
};
struct wpan_dev {
struct wpan_phy *wpan_phy;
int iftype;
@@ -175,6 +195,8 @@ struct wpan_dev {
struct list_head list;
struct net_device *netdev;
const struct wpan_dev_header_ops *header_ops;
/* lowpan interface, set when the wpan_dev belongs to one lowpan_dev */
struct net_device *lowpan_dev;
@@ -205,6 +227,17 @@ struct wpan_dev {
#define to_phy(_dev) container_of(_dev, struct wpan_phy, dev)
static inline int
wpan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
const struct ieee802154_addr *daddr,
const struct ieee802154_addr *saddr,
unsigned int len)
{
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
return wpan_dev->header_ops->create(skb, dev, daddr, saddr, len);
}
struct wpan_phy *
wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size);
static inline void wpan_phy_set_dev(struct wpan_phy *phy, struct device *dev)

9
include/net/ieee802154_netdev.h
View File

@@ -50,15 +50,6 @@ struct ieee802154_sechdr {
};
};
struct ieee802154_addr {
u8 mode;
__le16 pan_id;
union {
__le16 short_addr;
__le64 extended_addr;
};
};
struct ieee802154_hdr_fc {
#if defined(__LITTLE_ENDIAN_BITFIELD)
u16 type:3,