From 838b83d63d2909f9136f3030dc4fffa8230c31da Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Fri, 18 Sep 2015 11:30:42 +0200 Subject: ieee802154: introduce wpan_dev_header_ops 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 Signed-off-by: Marcel Holtmann --- include/net/cfg802154.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'include/net/cfg802154.h') diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h index 76b1ffaea863..242273ccf34b 100644 --- a/include/net/cfg802154.h +++ b/include/net/cfg802154.h @@ -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) -- cgit v1.2.3