datapath/linux/compat/include/linux/skbuff.h

   1 #ifndef __LINUX_SKBUFF_WRAPPER_H
   2 #define __LINUX_SKBUFF_WRAPPER_H 1
   3
   4 #include_next <linux/skbuff.h>
   5
   6 #include <linux/version.h>
   7
   8 #ifndef HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET
   9 static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb,
  10                                                     const int offset, void *to,
  11                                                     const unsigned int len)
  12 {
  13         memcpy(to, skb->data + offset, len);
  14 }
  15
  16 static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb,
  17                                                   const int offset,
  18                                                   const void *from,
  19                                                   const unsigned int len)
  20 {
  21         memcpy(skb->data + offset, from, len);
  22 }
  23
  24 #endif  /* !HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET */
  25
  26 #ifndef HAVE_SKB_RESET_TAIL_POINTER
  27 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
  28 {
  29         skb->tail = skb->data;
  30 }
  31 #endif
  32 /*
  33  * The networking layer reserves some headroom in skb data (via
  34  * dev_alloc_skb). This is used to avoid having to reallocate skb data when
  35  * the header has to grow. In the default case, if the header has to grow
  36  * 16 bytes or less we avoid the reallocation.
  37  *
  38  * Unfortunately this headroom changes the DMA alignment of the resulting
  39  * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
  40  * on some architectures. An architecture can override this value,
  41  * perhaps setting it to a cacheline in size (since that will maintain
  42  * cacheline alignment of the DMA). It must be a power of 2.
  43  *
  44  * Various parts of the networking layer expect at least 16 bytes of
  45  * headroom, you should not reduce this.
  46  */
  47 #ifndef NET_SKB_PAD
  48 #define NET_SKB_PAD     16
  49 #endif
  50
  51 #ifndef HAVE_SKB_COW_HEAD
  52 static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
  53                             int cloned)
  54 {
  55         int delta = 0;
  56
  57         if (headroom < NET_SKB_PAD)
  58                 headroom = NET_SKB_PAD;
  59         if (headroom > skb_headroom(skb))
  60                 delta = headroom - skb_headroom(skb);
  61
  62         if (delta || cloned)
  63                 return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
  64                                         GFP_ATOMIC);
  65         return 0;
  66 }
  67
  68 static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
  69 {
  70         return __skb_cow(skb, headroom, skb_header_cloned(skb));
  71 }
  72 #endif  /* !HAVE_SKB_COW_HEAD */
  73
  74 #ifndef HAVE_SKB_DST_ACCESSOR_FUNCS
  75 static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
  76 {
  77         return (struct dst_entry *)skb->dst;
  78 }
  79
  80 static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
  81 {
  82         skb->dst = dst;
  83 }
  84
  85 static inline struct rtable *skb_rtable(const struct sk_buff *skb)
  86 {
  87         return (struct rtable *)skb->dst;
  88 }
  89 #endif
  90
  91 #ifndef CHECKSUM_PARTIAL
  92 #define CHECKSUM_PARTIAL CHECKSUM_HW
  93 #endif
  94 #ifndef CHECKSUM_COMPLETE
  95 #define CHECKSUM_COMPLETE CHECKSUM_HW
  96 #endif
  97
  98 #ifndef HAVE_SKBUFF_HEADER_HELPERS
  99 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 100 {
 101         return skb->h.raw;
 102 }
 103
 104 static inline void skb_reset_transport_header(struct sk_buff *skb)
 105 {
 106         skb->h.raw = skb->data;
 107 }
 108
 109 static inline void skb_set_transport_header(struct sk_buff *skb,
 110                         const int offset)
 111 {
 112         skb->h.raw = skb->data + offset;
 113 }
 114
 115 static inline unsigned char *skb_network_header(const struct sk_buff *skb)
 116 {
 117         return skb->nh.raw;
 118 }
 119
 120 static inline void skb_reset_network_header(struct sk_buff *skb)
 121 {
 122         skb->nh.raw = skb->data;
 123 }
 124
 125 static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
 126 {
 127         skb->nh.raw = skb->data + offset;
 128 }
 129
 130 static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
 131 {
 132         return skb->mac.raw;
 133 }
 134
 135 static inline void skb_reset_mac_header(struct sk_buff *skb)
 136 {
 137         skb->mac_header = skb->data;
 138 }
 139
 140 static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
 141 {
 142         skb->mac.raw = skb->data + offset;
 143 }
 144
 145 static inline int skb_transport_offset(const struct sk_buff *skb)
 146 {
 147         return skb_transport_header(skb) - skb->data;
 148 }
 149
 150 static inline int skb_network_offset(const struct sk_buff *skb)
 151 {
 152         return skb_network_header(skb) - skb->data;
 153 }
 154
 155 static inline void skb_copy_to_linear_data(struct sk_buff *skb,
 156                                            const void *from,
 157                                            const unsigned int len)
 158 {
 159         memcpy(skb->data, from, len);
 160 }
 161 #endif  /* !HAVE_SKBUFF_HEADER_HELPERS */
 162
 163 #ifndef HAVE_SKB_WARN_LRO
 164 #ifndef NETIF_F_LRO
 165 static inline bool skb_warn_if_lro(const struct sk_buff *skb)
 166 {
 167         return false;
 168 }
 169 #else
 170 extern void __skb_warn_lro_forwarding(const struct sk_buff *skb);
 171
 172 static inline bool skb_warn_if_lro(const struct sk_buff *skb)
 173 {
 174         /* LRO sets gso_size but not gso_type, whereas if GSO is really
 175          * wanted then gso_type will be set. */
 176         struct skb_shared_info *shinfo = skb_shinfo(skb);
 177         if (shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) {
 178                 __skb_warn_lro_forwarding(skb);
 179                 return true;
 180         }
 181         return false;
 182 }
 183 #endif /* NETIF_F_LRO */
 184 #endif /* HAVE_SKB_WARN_LRO */
 185
 186 #ifndef HAVE_CONSUME_SKB
 187 #define consume_skb kfree_skb
 188 #endif
 189
 190 #ifndef HAVE_SKB_FRAG_PAGE
 191 static inline struct page *skb_frag_page(const skb_frag_t *frag)
 192 {
 193         return frag->page;
 194 }
 195 #endif
 196
 197 #ifndef HAVE_SKB_RESET_MAC_LEN
 198 static inline void skb_reset_mac_len(struct sk_buff *skb)
 199 {
 200         skb->mac_len = skb->network_header - skb->mac_header;
 201 }
 202 #endif
 203
 204 #ifndef HAVE_SKB_UNCLONE
 205 static inline int skb_unclone(struct sk_buff *skb, gfp_t pri)
 206 {
 207         might_sleep_if(pri & __GFP_WAIT);
 208
 209         if (skb_cloned(skb))
 210                 return pskb_expand_head(skb, 0, 0, pri);
 211
 212         return 0;
 213 }
 214 #endif
 215
 216 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 217 extern u32 __skb_get_rxhash(struct sk_buff *skb);
 218 static inline __u32 skb_get_rxhash(struct sk_buff *skb)
 219 {
 220 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34)
 221         if (skb->rxhash)
 222                 return skb->rxhash;
 223 #endif
 224         return __skb_get_rxhash(skb);
 225 }
 226 #endif
 227
 228 #endif