skb_frag_unref – release a reference on a paged fragment of an skb. Synopsis void skb_frag_unref(struct sk_buff *skb, int f); Arguments skb the buffer f the fragment offset Description Releases a reference on the f‘th paged fragment of skb. Copyright
skb_frag_set_page – sets the page contained in a paged fragment of an skb Synopsis void skb_frag_set_page(struct sk_buff *skb, int f, struct page *page); Arguments skb the buffer f the fragment offset page the page to set Description Sets the f‘th fragment of skb to contain page. Copyright
skb_frag_ref – take an addition reference on a paged fragment of an skb. Synopsis void skb_frag_ref(struct sk_buff *skb, int f); Arguments skb the buffer f the fragment offset. Description Takes an additional reference on the f‘th paged fragment of skb. Copyright
skb_frag_page – retrieve the page referred to by a paged fragment Synopsis struct page *skb_frag_page(const skb_frag_t *frag); Arguments frag the paged fragment Description Returns the struct page associated with frag. Copyright
skb_frag_dma_map – maps a paged fragment via the DMA API Synopsis dma_addr_t skb_frag_dma_map(struct device * dev, const skb_frag_t * frag, size_t offset, size_t size, enum dma_data_direction dir); Arguments dev the device to map the fragment to frag the paged fragment to map offset the offset within the fragment (starting at the fragment’s own offset) size the number of bytes to map dir…
skb_frag_address_safe – gets the address of the data contained in a paged fragment Synopsis void *skb_frag_address_safe(const skb_frag_t *frag); Arguments frag the paged fragment buffer Description Returns the address of the data within frag. Checks that the page is mapped and returns NULL otherwise. Copyright
skb_frag_address – gets the address of the data contained in a paged fragment Synopsis void *skb_frag_address(const skb_frag_t *frag); Arguments frag the paged fragment buffer Description Returns the address of the data within frag. The page must already be mapped. Copyright
skb_find_text – Find a text pattern in skb data Synopsis unsigned int skb_find_text(struct sk_buff *skb, unsigned int from, unsigned int to, struct ts_config *config); Arguments skb the buffer to look in from search offset to search limit config textsearch configuration Description Finds a pattern in the skb data according to the specified textsearch configuration. Use…
skb_fill_page_desc – initialise a paged fragment in an skb Synopsis void skb_fill_page_desc(struct sk_buff *skb, int i, struct page *page, int off, int size); Arguments skb buffer containing fragment to be initialised i paged fragment index to initialise page the page to use for this fragment off the offset to the data with page size the…
skb_fclone_busy – check if fclone is busy Synopsis bool skb_fclone_busy(const struct sock * sk, const struct sk_buff * skb); Arguments sk socket skb buffer Description Returns true if skb is a fast clone, and its clone is not freed. Some drivers call skb_orphan in their ndo_start_xmit, so we also check that this didnt happen. Copyright
skb_dst_set_noref – sets skb dst, hopefully, without taking reference Synopsis void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst); Arguments skb buffer dst dst entry Description Sets skb dst, assuming a reference was not taken on dst. If dst entry is cached, we do not take reference and dst_release will be avoided by refdst_drop. If dst entry…
skb_dst_set – sets skb dst Synopsis void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst); Arguments skb buffer dst dst entry Description Sets skb dst, assuming a reference was taken on dst and should be released by skb_dst_drop Copyright
skb_dst_is_noref – Test if skb dst isn’t refcounted Synopsis bool skb_dst_is_noref(const struct sk_buff * skb); Arguments skb buffer Copyright
skb_dst – returns skb dst_entry Synopsis struct dst_entry *skb_dst(const struct sk_buff *skb); Arguments skb buffer Description Returns skb dst_entry, regardless of reference taken or not. Copyright
skb_dequeue_tail – remove from the tail of the queue Synopsis struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list); Arguments list list to dequeue from Description Remove the tail of the list. The list lock is taken so the function may be used safely with other locking list functions. The tail item is returned or NULL if the list…
skb_dequeue – remove from the head of the queue Synopsis struct sk_buff *skb_dequeue(struct sk_buff_head *list); Arguments list list to dequeue from Description Remove the head of the list. The list lock is taken so the function may be used safely with other locking list functions. The head item is returned or NULL if the list…
skb_cow_head – skb_cow but only making the head writable Synopsis int skb_cow_head(struct sk_buff *skb, unsigned int headroom); Arguments skb buffer to cow headroom needed headroom Description This function is identical to skb_cow except that we replace the skb_cloned check by skb_header_cloned. It should be used when you only need to push on some header and…
skb_cow_data – Check that a socket buffer’s data buffers are writable Synopsis int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer); Arguments skb The socket buffer to check. tailbits Amount of trailing space to be added trailer Returned pointer to the skb where the tailbits space begins Description Make sure that the data buffers attached…
skb_cow – copy header of skb when it is required Synopsis int skb_cow(struct sk_buff *skb, unsigned int headroom); Arguments skb buffer to cow headroom needed headroom Description If the skb passed lacks sufficient headroom or its data part is shared, data is reallocated. If reallocation fails, an error is returned and original skb is not…
skb_copy_ubufs – copy userspace skb frags buffers to kernel Synopsis int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask); Arguments skb the skb to modify gfp_mask allocation priority Description This must be called on SKBTX_DEV_ZEROCOPY skb. It will copy all frags into kernel and drop the reference to userspace pages. If this function is called from an interrupt…