/*- * Copyright (c) 2007 Michael Taylor, Apprion * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $Id: ieee80211_skb.h 2647 2007-08-09 08:43:58Z mtaylor $ */ #ifndef _NET80211_IEEE80211_SKB_H_ #define _NET80211_IEEE80211_SKB_H_ /******************************************************************************* * Globals ******************************************************************************/ #ifdef IEEE80211_DEBUG_REFCNT /* Count of currently tracked skbs */ extern atomic_t skb_total_counter; /* Count of currently tracked skbs' references */ extern atomic_t skb_refs_counter; #endif /* #ifdef IEEE80211_DEBUG_REFCNT */ /******************************************************************************* * Public API ******************************************************************************/ /* SKB_XX(...) macros will blow up if _skb is NULL (detect problems early) */ #define SKB_CB(_skb) ((struct ieee80211_cb *)(_skb)->cb) #define SKB_NI(_skb) (SKB_CB(_skb)->ni) #define M_FLAG_SET(_skb, _flag) \ (SKB_CB(_skb)->flags |= (_flag)) #define M_FLAG_CLR(_skb, _flag) \ (SKB_CB(_skb)->flags &= ~(_flag)) #define M_FLAG_GET(_skb, _flag) \ (SKB_CB(_skb)->flags & (_flag)) #define M_FLAG_KEEP_ONLY(_skb, _flag) \ (SKB_CB(_skb)->flags &= (_flag)) #define M_PWR_SAV_SET(skb) M_FLAG_SET((skb), M_PWR_SAV) #define M_PWR_SAV_CLR(skb) M_FLAG_CLR((skb), M_PWR_SAV) #define M_PWR_SAV_GET(skb) M_FLAG_GET((skb), M_PWR_SAV) /* SKBs on the power save queue are tagged with an age and * timed out. We reuse the hardware checksum field in the * mbuf packet header to store this data. * XXX: use private CB area. */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20) #define skb_age csum_offset #else #define skb_age csum #endif #define M_AGE_SET(_skb,_v) ((_skb)->skb_age = (_v)) #define M_AGE_GET(_skb) ((_skb)->skb_age) #define M_AGE_SUB(_skb,_adj) ((_skb)->skb_age -= (_adj)) /* ieee80211_dev_kfree_skb will release one reference from SKB. * If SKB refcount is going to zero: * - Free the node reference and set it to null. * - Break the linked list, clearing next skb's prev pointer if possible. */ void ieee80211_dev_kfree_skb(struct sk_buff **pskb); static inline void ieee80211_skb_copy_noderef(struct sk_buff *src, struct sk_buff *dst) { if (SKB_NI(src) != NULL) SKB_NI(dst) = ieee80211_ref_node(SKB_NI(src)); } /* ieee80211_dev_kfree_skb_list will invoke ieee80211_dev_kfree_skb on each node in * a list of skbs, starting with the first. */ void ieee80211_dev_kfree_skb_list(struct sk_buff **pskb); struct sk_buff *ieee80211_dev_alloc_skb(int size); void ieee80211_skb_track(struct sk_buff *skb); void ieee80211_skb_untrack(struct sk_buff *skb); #ifdef IEEE80211_DEBUG_REFCNT int ieee80211_skb_counter(void); int ieee80211_skb_references(void); #else #define ieee80211_skb_counter() (0) #define ieee80211_skb_references() (0) #endif /******************************************************************************* * skbuff leak/refcount debugging Replacement Functions ******************************************************************************/ #ifdef IEEE80211_DEBUG_REFCNT int vlan_hwaccel_rx_debug(struct sk_buff *skb, struct vlan_group *grp, unsigned short vlan_tag, const char *func, int line); int netif_rx_debug(struct sk_buff *skb, const char *func, int line); struct sk_buff *alloc_skb_debug(unsigned int length, gfp_t gfp_mask, const char *func, int line); struct sk_buff *dev_alloc_skb_debug(unsigned int length, const char *func, int line); struct sk_buff *skb_clone_debug(struct sk_buff *skb, gfp_t pri, const char *func, int line); struct sk_buff *skb_copy_debug(struct sk_buff *skb, gfp_t pri, const char *func, int line); struct sk_buff *skb_get_debug(struct sk_buff *skb, const char *func, int line); struct sk_buff *skb_realloc_headroom_debug(struct sk_buff *skb, unsigned int headroom, const char *func, int line); struct sk_buff *pskb_copy_debug(struct sk_buff *skb, gfp_t pri, const char *func, int line); int dev_queue_xmit_debug(struct sk_buff *skb, const char *func, int line); struct sk_buff *skb_share_check_debug(struct sk_buff *skb, gfp_t pri, const char *func, int line); void kfree_skb_fast_debug(struct sk_buff *skb, const char *func, int line); struct sk_buff *skb_unshare_debug(struct sk_buff *skb, gfp_t pri, const char *func, int line); struct sk_buff *skb_copy_expand_debug(const struct sk_buff *skb, int newheadroom, int newtailroom, gfp_t gfp_mask, const char *func, int line); #undef alloc_skb #undef dev_alloc_skb #undef dev_kfree_skb #undef dev_kfree_skb_any #undef dev_kfree_skb_irq #undef dev_queue_xmit #undef kfree_skb #undef kfree_skb_fast #undef netif_rx #undef pskb_copy #undef skb_clone #undef skb_copy #undef skb_copy_expand #undef skb_get #undef skb_realloc_headroom #undef skb_share_check #undef skb_unshare #undef vlan_hwaccel_rx #define skb_unshare(_skb, _pri) \ skb_unshare_debug(_skb, _pri, __func__, __LINE__) #define skb_copy_expand(_skb, _newheadroom, _newtailroom, _gfp_mask) \ skb_copy_expand_debug(_skb, _newheadroom, _newtailroom, _gfp_mask, __func__, __LINE__) #define vlan_hwaccel_rx(_skb, _grp, _tag) \ vlan_hwaccel_rx_debug(_skb, _grp, _tag, __func__, __LINE__) #define netif_rx(_skb) \ netif_rx_debug(_skb, __func__, __LINE__) #define alloc_skb(_length, _gfp_mask) \ alloc_skb_debug(_length, _gfp_mask, __func__, __LINE__) #define dev_alloc_skb(_length) \ dev_alloc_skb_debug(_length, __func__, __LINE__) #define dev_kfree_skb_irq(_skb) \ unref_skb(_skb, UNREF_USE_DEV_KFREE_SKB_IRQ, __func__, __LINE__) #define dev_kfree_skb_any(_skb) \ unref_skb(_skb, UNREF_USE_DEV_KFREE_SKB_ANY, __func__, __LINE__) #define dev_kfree_skb(_skb) \ unref_skb(_skb, UNREF_USE_DEV_KFREE_SKB, __func__, __LINE__) #define kfree_skb(_skb) \ unref_skb(_skb, UNREF_USE_KFREE_SKB, __func__, __LINE__) #define skb_clone(_skb, _pri) \ skb_clone_debug(_skb, _pri, __func__, __LINE__) #define skb_share_check(_skb, _pri) \ skb_share_check_debug(_skb, _pri, __func__, __LINE__) #define kfree_skb_fast(_skb) \ kfree_skb_fast_debug(_skb, __func__, __LINE__) #define skb_realloc_headroom(_skb, _headroom) \ skb_realloc_headroom_debug(_skb, _headroom, __func__, __LINE__) #define pskb_copy(_skb, _pri) \ pskb_copy_debug(_skb, _pri, __func__, __LINE__) #define skb_get(_skb) \ skb_get_debug(_skb, __func__, __LINE__) #define skb_copy(_skb, _pri) \ skb_copy_debug(_skb, _pri, __func__, __LINE__) #define dev_queue_xmit(_skb) \ dev_queue_xmit_debug(_skb, __func__, __LINE__) #endif /* #ifdef IEEE80211_DEBUG_REFCNT */ #endif /* _NET80211_IEEE80211_SKB_H_ */