1 #ifndef __LINUX_SKBUFF_WRAPPER_H
2 #define __LINUX_SKBUFF_WRAPPER_H 1
4 #include <linux/version.h>
5 #include <linux/types.h>
7 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
8 /* This should be before skbuff.h to make sure that we rewrite
12 int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
14 #define pskb_expand_head rpl_pskb_expand_head
17 #include_next <linux/skbuff.h>
18 #include <linux/jhash.h>
20 #ifndef HAVE_IGNORE_DF_RENAME
21 #define ignore_df local_df
24 #ifndef HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET
25 static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb,
26 const int offset, void *to,
27 const unsigned int len)
29 memcpy(to, skb->data + offset, len);
32 static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb,
35 const unsigned int len)
37 memcpy(skb->data + offset, from, len);
40 #endif /* !HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET */
42 #ifndef HAVE_SKB_INNER_TRANSPORT_OFFSET
43 static inline int skb_inner_transport_offset(const struct sk_buff *skb)
45 return skb_inner_transport_header(skb) - skb->data;
49 #ifndef HAVE_SKB_RESET_TAIL_POINTER
50 static inline void skb_reset_tail_pointer(struct sk_buff *skb)
52 skb->tail = skb->data;
56 * The networking layer reserves some headroom in skb data (via
57 * dev_alloc_skb). This is used to avoid having to reallocate skb data when
58 * the header has to grow. In the default case, if the header has to grow
59 * 16 bytes or less we avoid the reallocation.
61 * Unfortunately this headroom changes the DMA alignment of the resulting
62 * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
63 * on some architectures. An architecture can override this value,
64 * perhaps setting it to a cacheline in size (since that will maintain
65 * cacheline alignment of the DMA). It must be a power of 2.
67 * Various parts of the networking layer expect at least 16 bytes of
68 * headroom, you should not reduce this.
71 #define NET_SKB_PAD 16
74 #ifndef HAVE_SKB_COW_HEAD
75 static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
80 if (headroom < NET_SKB_PAD)
81 headroom = NET_SKB_PAD;
82 if (headroom > skb_headroom(skb))
83 delta = headroom - skb_headroom(skb);
86 return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
91 static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
93 return __skb_cow(skb, headroom, skb_header_cloned(skb));
95 #endif /* !HAVE_SKB_COW_HEAD */
97 #ifndef HAVE_SKB_DST_ACCESSOR_FUNCS
98 static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
100 return (struct dst_entry *)skb->dst;
103 static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
108 static inline struct rtable *skb_rtable(const struct sk_buff *skb)
110 return (struct rtable *)skb->dst;
114 #ifndef CHECKSUM_PARTIAL
115 #define CHECKSUM_PARTIAL CHECKSUM_HW
117 #ifndef CHECKSUM_COMPLETE
118 #define CHECKSUM_COMPLETE CHECKSUM_HW
121 #ifndef HAVE_SKB_WARN_LRO
123 static inline bool skb_warn_if_lro(const struct sk_buff *skb)
128 extern void __skb_warn_lro_forwarding(const struct sk_buff *skb);
130 static inline bool skb_warn_if_lro(const struct sk_buff *skb)
132 /* LRO sets gso_size but not gso_type, whereas if GSO is really
133 * wanted then gso_type will be set. */
134 struct skb_shared_info *shinfo = skb_shinfo(skb);
135 if (shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) {
136 __skb_warn_lro_forwarding(skb);
141 #endif /* NETIF_F_LRO */
142 #endif /* HAVE_SKB_WARN_LRO */
144 #ifndef HAVE_CONSUME_SKB
145 #define consume_skb kfree_skb
148 #ifndef HAVE_SKB_FRAG_PAGE
149 #include <linux/mm.h>
151 static inline struct page *skb_frag_page(const skb_frag_t *frag)
156 static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page)
160 static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size)
164 static inline void __skb_frag_ref(skb_frag_t *frag)
166 get_page(skb_frag_page(frag));
168 static inline void __skb_frag_unref(skb_frag_t *frag)
170 put_page(skb_frag_page(frag));
173 static inline void skb_frag_ref(struct sk_buff *skb, int f)
175 __skb_frag_ref(&skb_shinfo(skb)->frags[f]);
178 static inline void skb_frag_unref(struct sk_buff *skb, int f)
180 __skb_frag_unref(&skb_shinfo(skb)->frags[f]);
185 #ifndef HAVE_SKB_RESET_MAC_LEN
186 static inline void skb_reset_mac_len(struct sk_buff *skb)
188 skb->mac_len = skb->network_header - skb->mac_header;
192 #ifndef HAVE_SKB_UNCLONE
193 static inline int skb_unclone(struct sk_buff *skb, gfp_t pri)
195 might_sleep_if(pri & __GFP_WAIT);
198 return pskb_expand_head(skb, 0, 0, pri);
204 #ifndef HAVE_SKB_ORPHAN_FRAGS
205 static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask)
211 #ifndef HAVE_SKB_GET_HASH
212 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0)
213 #define __skb_get_hash rpl__skb_get_rxhash
214 #define skb_get_hash rpl_skb_get_rxhash
216 extern u32 __skb_get_hash(struct sk_buff *skb);
217 static inline __u32 skb_get_hash(struct sk_buff *skb)
221 #ifndef HAVE_U16_RXHASH
224 return jhash_1word(skb->rxhash, 0);
227 return __skb_get_hash(skb);
231 #define skb_get_hash skb_get_rxhash
232 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0) */
233 #endif /* HAVE_SKB_GET_HASH */
235 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0)
236 static inline void skb_tx_error(struct sk_buff *skb)
240 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0) */
242 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
243 #define skb_zerocopy_headlen rpl_skb_zerocopy_headlen
244 unsigned int rpl_skb_zerocopy_headlen(const struct sk_buff *from);
247 #ifndef HAVE_SKB_ZEROCOPY
248 #define skb_zerocopy rpl_skb_zerocopy
249 int rpl_skb_zerocopy(struct sk_buff *to, struct sk_buff *from, int len,
253 #ifndef HAVE_SKB_CLEAR_HASH
254 static inline void skb_clear_hash(struct sk_buff *skb)
259 #if defined(HAVE_L4_RXHASH) && !defined(HAVE_RHEL_OVS_HOOK)
265 #ifndef HAVE_SKB_HAS_FRAG_LIST
266 #define skb_has_frag_list skb_has_frags
269 #ifndef HAVE___SKB_FILL_PAGE_DESC
270 static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
271 struct page *page, int off, int size)
273 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
275 __skb_frag_set_page(frag, page);
276 frag->page_offset = off;
277 skb_frag_size_set(frag, size);
281 #ifndef HAVE_SKB_ENSURE_WRITABLE
282 #define skb_ensure_writable rpl_skb_ensure_writable
283 int rpl_skb_ensure_writable(struct sk_buff *skb, int write_len);
286 #ifndef HAVE_SKB_VLAN_POP
287 #define skb_vlan_pop rpl_skb_vlan_pop
288 int rpl_skb_vlan_pop(struct sk_buff *skb);
291 #ifndef HAVE_SKB_VLAN_PUSH
292 #define skb_vlan_push rpl_skb_vlan_push
293 int rpl_skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci);
296 #ifndef HAVE_KFREE_SKB_LIST
297 void rpl_kfree_skb_list(struct sk_buff *segs);
298 #define kfree_skb_list rpl_kfree_skb_list
301 #ifndef HAVE_SKB_CHECKSUM_START_OFFSET
302 static inline int skb_checksum_start_offset(const struct sk_buff *skb)
304 return skb->csum_start - skb_headroom(skb);
308 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,3,0)
309 #define skb_postpull_rcsum rpl_skb_postpull_rcsum
310 static inline void skb_postpull_rcsum(struct sk_buff *skb,
311 const void *start, unsigned int len)
313 if (skb->ip_summed == CHECKSUM_COMPLETE)
314 skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0));
315 else if (skb->ip_summed == CHECKSUM_PARTIAL &&
316 skb_checksum_start_offset(skb) < 0)
317 skb->ip_summed = CHECKSUM_NONE;
320 #define skb_pull_rcsum rpl_skb_pull_rcsum
321 static inline unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len)
323 unsigned char *data = skb->data;
325 BUG_ON(len > skb->len);
326 __skb_pull(skb, len);
327 skb_postpull_rcsum(skb, data, len);
333 #ifndef HAVE_SKB_SCRUB_PACKET_XNET
334 #define skb_scrub_packet rpl_skb_scrub_packet
335 void rpl_skb_scrub_packet(struct sk_buff *skb, bool xnet);
338 #define skb_pop_mac_header rpl_skb_pop_mac_header
339 static inline void skb_pop_mac_header(struct sk_buff *skb)
341 skb->mac_header = skb->network_header;
344 #ifndef HAVE_SKB_CLEAR_HASH_IF_NOT_L4
345 static inline void skb_clear_hash_if_not_l4(struct sk_buff *skb)
352 #ifndef HAVE_SKB_POSTPUSH_RCSUM
353 static inline void skb_postpush_rcsum(struct sk_buff *skb,
354 const void *start, unsigned int len)
356 /* For performing the reverse operation to skb_postpull_rcsum(),
357 * we can instead of ...
359 * skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
361 * ... just use this equivalent version here to save a few
362 * instructions. Feeding csum of 0 in csum_partial() and later
363 * on adding skb->csum is equivalent to feed skb->csum in the
366 if (skb->ip_summed == CHECKSUM_COMPLETE)
367 skb->csum = csum_partial(start, len, skb->csum);