1 #ifndef __LINUX_SKBUFF_WRAPPER_H
2 #define __LINUX_SKBUFF_WRAPPER_H 1
4 #include_next <linux/skbuff.h>
6 #include <linux/version.h>
8 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
9 /* In version 2.6.24 the return type of skb_headroom() changed from 'int' to
10 * 'unsigned int'. We use skb_headroom() as one arm of a min(a,b) invocation
11 * in make_writable() in actions.c, so we need the correct type. */
12 #define skb_headroom rpl_skb_headroom
13 static inline unsigned int rpl_skb_headroom(const struct sk_buff *skb)
15 return skb->data - skb->head;
19 #ifndef HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET
20 static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb,
21 const int offset, void *to,
22 const unsigned int len)
24 memcpy(to, skb->data + offset, len);
27 static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb,
30 const unsigned int len)
32 memcpy(skb->data + offset, from, len);
35 #endif /* !HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET */
38 * The networking layer reserves some headroom in skb data (via
39 * dev_alloc_skb). This is used to avoid having to reallocate skb data when
40 * the header has to grow. In the default case, if the header has to grow
41 * 16 bytes or less we avoid the reallocation.
43 * Unfortunately this headroom changes the DMA alignment of the resulting
44 * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
45 * on some architectures. An architecture can override this value,
46 * perhaps setting it to a cacheline in size (since that will maintain
47 * cacheline alignment of the DMA). It must be a power of 2.
49 * Various parts of the networking layer expect at least 16 bytes of
50 * headroom, you should not reduce this.
53 #define NET_SKB_PAD 16
56 #ifndef HAVE_SKB_COW_HEAD
57 static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
62 if (headroom < NET_SKB_PAD)
63 headroom = NET_SKB_PAD;
64 if (headroom > skb_headroom(skb))
65 delta = headroom - skb_headroom(skb);
68 return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
73 static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
75 return __skb_cow(skb, headroom, skb_header_cloned(skb));
77 #endif /* !HAVE_SKB_COW_HEAD */
79 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
80 static inline int skb_clone_writable(struct sk_buff *skb, int len)
86 #ifndef HAVE_SKB_DST_ACCESSOR_FUNCS
87 static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
89 return (struct dst_entry *)skb->dst;
92 static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
97 static inline struct rtable *skb_rtable(const struct sk_buff *skb)
99 return (struct rtable *)skb->dst;
103 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17)
104 /* Emulate Linux 2.6.17 and later behavior, in which kfree_skb silently ignores
105 * null pointer arguments. */
106 #define kfree_skb(skb) kfree_skb_maybe_null(skb)
107 static inline void kfree_skb_maybe_null(struct sk_buff *skb)
109 if (likely(skb != NULL))
115 #ifndef CHECKSUM_PARTIAL
116 #define CHECKSUM_PARTIAL CHECKSUM_HW
118 #ifndef CHECKSUM_COMPLETE
119 #define CHECKSUM_COMPLETE CHECKSUM_HW
123 #define mac_header mac.raw
124 #define network_header nh.raw
125 #define transport_header h.raw
128 #ifndef HAVE_SKBUFF_HEADER_HELPERS
129 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
134 static inline void skb_reset_transport_header(struct sk_buff *skb)
136 skb->h.raw = skb->data;
139 static inline void skb_set_transport_header(struct sk_buff *skb,
142 skb->h.raw = skb->data + offset;
145 static inline unsigned char *skb_network_header(const struct sk_buff *skb)
150 static inline void skb_reset_network_header(struct sk_buff *skb)
152 skb->nh.raw = skb->data;
155 static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
157 skb->nh.raw = skb->data + offset;
160 static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
165 static inline void skb_reset_mac_header(struct sk_buff *skb)
167 skb->mac_header = skb->data;
170 static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
172 skb->mac.raw = skb->data + offset;
175 static inline int skb_transport_offset(const struct sk_buff *skb)
177 return skb_transport_header(skb) - skb->data;
180 static inline int skb_network_offset(const struct sk_buff *skb)
182 return skb_network_header(skb) - skb->data;
185 static inline void skb_copy_to_linear_data(struct sk_buff *skb,
187 const unsigned int len)
189 memcpy(skb->data, from, len);
191 #endif /* !HAVE_SKBUFF_HEADER_HELPERS */
193 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
194 #warning "TSO/UFO not supported on kernels earlier than 2.6.18"
196 static inline int skb_is_gso(const struct sk_buff *skb)
201 static inline struct sk_buff *skb_gso_segment(struct sk_buff *skb,
206 #endif /* before 2.6.18 */
208 #ifndef HAVE_SKB_WARN_LRO
210 static inline bool skb_warn_if_lro(const struct sk_buff *skb)
215 extern void __skb_warn_lro_forwarding(const struct sk_buff *skb);
217 static inline bool skb_warn_if_lro(const struct sk_buff *skb)
219 /* LRO sets gso_size but not gso_type, whereas if GSO is really
220 * wanted then gso_type will be set. */
221 struct skb_shared_info *shinfo = skb_shinfo(skb);
222 if (shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) {
223 __skb_warn_lro_forwarding(skb);
228 #endif /* NETIF_F_LRO */
229 #endif /* HAVE_SKB_WARN_LRO */
231 #ifndef HAVE_NETDEV_ALLOC_SKB_IP_ALIGN
232 static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
235 struct sk_buff *skb = netdev_alloc_skb(dev, length + NET_IP_ALIGN);
237 if (NET_IP_ALIGN && skb)
238 skb_reserve(skb, NET_IP_ALIGN);