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_zerocopy – Zero copy skb to skb Synopsis int skb_zerocopy(struct sk_buff *to, struct sk_buff *from, int len, int hlen); Arguments to destination buffer from source buffer len number of bytes to copy from source buffer hlen size of linear headroom in destination buffer Description Copies up to `len` bytes from `from` to `to` by creating…
skb_unshare – make a copy of a shared buffer Synopsis struct sk_buff *skb_unshare(struct sk_buff *skb, gfp_t pri); Arguments skb buffer to check pri priority for memory allocation Description If the socket buffer is a clone then this function creates a new copy of the data, drops a reference count on the old copy and returns…
skb_unlink – remove a buffer from a list Synopsis void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list); Arguments skb buffer to remove list list to use Description Remove a packet from a list. The list locks are taken and this function is atomic with respect to other list locked calls You must know what list the…
skb_tx_timestamp – Driver hook for transmit timestamping Synopsis void skb_tx_timestamp(struct sk_buff *skb); Arguments skb A socket buffer. Description Ethernet MAC Drivers should call this function in their hard_xmit function immediately before giving the sk_buff to the MAC hardware. Specifically, one should make absolutely sure that this function is called before TX completion of this packet…
skb_tx_error – report an sk_buff xmit error Synopsis void skb_tx_error(struct sk_buff *skb); Arguments skb buffer that triggered an error Description Report xmit error if a device callback is tracking this skb. skb must be freed afterwards. Copyright
skb_try_coalesce – try to merge skb to prior one Synopsis bool skb_try_coalesce(struct sk_buff * to, struct sk_buff * from, bool * fragstolen, int * delta_truesize); Arguments to prior buffer from buffer to add fragstolen pointer to boolean delta_truesize how much more was allocated than was requested Copyright
skb_trim – remove end from a buffer Synopsis void skb_trim(struct sk_buff *skb, unsigned int len); Arguments skb buffer to alter len new length Description Cut the length of a buffer down by removing data from the tail. If the buffer is already under the length specified it is not modified. The skb must be linear….
skb_tailroom_reserve – adjust reserved_tailroom Synopsis void skb_tailroom_reserve(struct sk_buff *skb, unsigned int mtu, unsigned int needed_tailroom); Arguments skb buffer to alter mtu maximum amount of headlen permitted needed_tailroom minimum amount of reserved_tailroom Description Set reserved_tailroom so that headlen can be as large as possible but not larger than mtu and tailroom cannot be smaller than needed_tailroom….
skb_tailroom – bytes at buffer end Synopsis int skb_tailroom(const struct sk_buff *skb); Arguments skb buffer to check Description Return the number of bytes of free space at the tail of an sk_buff Copyright
skb_store_bits – store bits from kernel buffer to skb Synopsis int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len); Arguments skb destination buffer offset offset in destination from source buffer len number of bytes to copy Description Copy the specified number of bytes from the source buffer to the destination skb. This function…
skb_split – Split fragmented skb to two parts at length len. Synopsis void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len); Arguments skb the buffer to split skb1 the buffer to receive the second part len new length for skb Copyright
skb_shared – is the buffer shared Synopsis int skb_shared(const struct sk_buff *skb); Arguments skb buffer to check Description Returns true if more than one person has a reference to this buffer. Copyright
skb_share_check – check if buffer is shared and if so clone it Synopsis struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri); Arguments skb buffer to check pri priority for memory allocation Description If the buffer is shared the buffer is cloned and the old copy drops a reference. A new clone with a single reference is…
skb_seq_read – Sequentially read skb data Synopsis unsigned int skb_seq_read(unsigned int consumed, const u8 **data, struct skb_seq_state *st); Arguments consumed number of bytes consumed by the caller so far data destination pointer for data to be returned st state variable Description Reads a block of skb data at consumed relative to the lower offset specified…
skb_segment – Perform protocol segmentation on skb. Synopsis struct sk_buff *skb_segment(struct sk_buff *head_skb, netdev_features_t features); Arguments head_skb buffer to segment features features for the output path (see dev->features) Description This function performs segmentation on the given skb. It returns a pointer to the first in a list of new skbs for the segments. In case…
skb_scrub_packet – scrub an skb Synopsis void skb_scrub_packet(struct sk_buff *skb, bool xnet); Arguments skb buffer to clean xnet packet is crossing netns Description skb_scrub_packet can be used after encapsulating or decapsulting a packet into/from a tunnel. Some information have to be cleared during these operations. skb_scrub_packet can also be used to clean a skb before…
skb_reserve – adjust headroom Synopsis void skb_reserve(struct sk_buff *skb, int len); Arguments skb buffer to alter len bytes to move Description Increase the headroom of an empty sk_buff by reducing the tail room. This is only allowed for an empty buffer. Copyright
skb_queue_tail – queue a buffer at the list tail Synopsis void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk); Arguments list list to use newsk buffer to queue Description Queue a buffer at the tail of the list. This function takes the list lock and can be used safely with other locking sk_buff functions safely. A buffer…
skb_queue_splice_tail_init – join two skb lists and reinitialise the emptied list Synopsis void skb_queue_splice_tail_init(struct sk_buff_head *list, struct sk_buff_head *head); Arguments list the new list to add head the place to add it in the first list Description Each of the lists is a queue. The list at list is reinitialised Copyright
skb_queue_splice_tail – join two skb lists, each list being a queue Synopsis void skb_queue_splice_tail(const struct sk_buff_head *list, struct sk_buff_head *head); Arguments list the new list to add head the place to add it in the first list Copyright