136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
#ifndef __LINUX_SKBUFF_WRAPPER_H
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#define __LINUX_SKBUFF_WRAPPER_H 1
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#include_next <linux/skbuff.h>
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#define mac_header mac.raw
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#define network_header nh.raw
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/* Emulate Linux 2.6 behavior, in which kfree_skb silently ignores null pointer
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* arguments. */
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#define kfree_skb(skb) kfree_skb_maybe_null(skb)
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static inline void kfree_skb_maybe_null(struct sk_buff *skb)
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{
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if (likely(skb != NULL))
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(kfree_skb)(skb);
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}
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/* Note that CHECKSUM_PARTIAL is not implemented, but this allows us to at
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* least test against it: see update_csum() in forward.c. */
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#define CHECKSUM_PARTIAL 3
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#define CHECKSUM_COMPLETE CHECKSUM_HW
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static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
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{
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return skb->h.raw;
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}
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static inline void skb_reset_transport_header(struct sk_buff *skb)
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{
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skb->h.raw = skb->data;
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}
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static inline void skb_set_transport_header(struct sk_buff *skb,
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const int offset)
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{
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skb->h.raw = skb->data + offset;
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}
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static inline unsigned char *skb_network_header(const struct sk_buff *skb)
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{
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return skb->nh.raw;
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}
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static inline void skb_reset_network_header(struct sk_buff *skb)
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{
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skb->nh.raw = skb->data;
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}
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static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
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{
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skb->nh.raw = skb->data + offset;
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}
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static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
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{
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return skb->mac.raw;
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}
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static inline int skb_mac_header_was_set(const struct sk_buff *skb)
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{
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return skb->mac.raw != NULL;
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}
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static inline void skb_reset_mac_header(struct sk_buff *skb)
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{
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skb->mac.raw = skb->data;
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}
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static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
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{
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skb->mac.raw = skb->data + offset;
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}
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static inline int skb_transport_offset(const struct sk_buff *skb)
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{
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return skb_transport_header(skb) - skb->data;
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}
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static inline u32 skb_network_header_len(const struct sk_buff *skb)
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{
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return skb->h.raw - skb->nh.raw;
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}
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static inline int skb_network_offset(const struct sk_buff *skb)
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{
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return skb_network_header(skb) - skb->data;
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}
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static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
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{
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return skb->tail;
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}
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static inline void skb_reset_tail_pointer(struct sk_buff *skb)
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{
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skb->tail = skb->data;
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}
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static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
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{
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skb->tail = skb->data + offset;
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}
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/*
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* CPUs often take a performance hit when accessing unaligned memory
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* locations. The actual performance hit varies, it can be small if the
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* hardware handles it or large if we have to take an exception and fix it
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* in software.
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*
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* Since an ethernet header is 14 bytes network drivers often end up with
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* the IP header at an unaligned offset. The IP header can be aligned by
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* shifting the start of the packet by 2 bytes. Drivers should do this
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* with:
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*
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* skb_reserve(NET_IP_ALIGN);
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*
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* The downside to this alignment of the IP header is that the DMA is now
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* unaligned. On some architectures the cost of an unaligned DMA is high
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* and this cost outweighs the gains made by aligning the IP header.
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*
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* Since this trade off varies between architectures, we allow NET_IP_ALIGN
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* to be overridden.
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*/
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#ifndef NET_IP_ALIGN
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#define NET_IP_ALIGN 2
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#endif
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static inline void skb_copy_to_linear_data(struct sk_buff *skb,
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const void *from,
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const unsigned int len)
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{
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memcpy(skb->data, from, len);
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}
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#endif
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