The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
skb_header_cloned – is the header a clone Synopsis int skb_header_cloned(const struct sk_buff *skb); Arguments skb buffer to check Description Returns true if modifying the header part of the buffer requires the data to be copied. Copyright
skb_head_is_locked – Determine if the skb->head is locked down Synopsis bool skb_head_is_locked(const struct sk_buff * skb); Arguments skb skb to check Description The head on skbs build around a head frag can be removed if they are not cloned. This function returns true if the skb head is locked down due to either being allocated via kmalloc,…
skb_has_shared_frag – can any frag be overwritten Synopsis bool skb_has_shared_frag(const struct sk_buff * skb); Arguments skb buffer to test Description Return true if the skb has at least one frag that might be modified by an external entity (as in vmsplice/sendfile) Copyright
skb_gso_validate_mtu – Return in case such skb fits a given MTU Synopsis bool skb_gso_validate_mtu(const struct sk_buff * skb, unsigned int mtu); Arguments skb GSO skb mtu MTU to validate against Description skb_gso_validate_mtu validates if a given skb will fit a wanted MTU once split. Copyright
skb_gso_transport_seglen – Return length of individual segments of a gso packet Synopsis unsigned int skb_gso_transport_seglen(const struct sk_buff *skb); Arguments skb GSO skb Description skb_gso_transport_seglen is used to determine the real size of the individual segments, including Layer4 headers (TCP/UDP). The MAC/L2 or network (IP, IPv6) headers are not accounted for. Copyright
skb_gso_network_seglen – Return length of individual segments of a gso packet Synopsis unsigned int skb_gso_network_seglen(const struct sk_buff *skb); Arguments skb GSO skb Description skb_gso_network_seglen is used to determine the real size of the individual segments, including Layer3 (IP, IPv6) and L4 headers (TCP/UDP). The MAC/L2 header is not accounted for. Copyright
skb_get_timestamp – get timestamp from a skb Synopsis void skb_get_timestamp(const struct sk_buff *skb, struct timeval *stamp); Arguments skb skb to get stamp from stamp pointer to struct timeval to store stamp in Description Timestamps are stored in the skb as offsets to a base timestamp. This function converts the offset back to a struct timeval…
skb_get – reference buffer Synopsis struct sk_buff *skb_get(struct sk_buff *skb); Arguments skb buffer to reference Description Makes another reference to a socket buffer and returns a pointer to the buffer. Copyright
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