| .. SPDX-License-Identifier: GPL-2.0 |
| |
| struct sk_buff |
| ============== |
| |
| :c:type:`sk_buff` is the main networking structure representing |
| a packet. |
| |
| Basic sk_buff geometry |
| ---------------------- |
| |
| .. kernel-doc:: include/linux/skbuff.h |
| :doc: Basic sk_buff geometry |
| |
| Shared skbs and skb clones |
| -------------------------- |
| |
| :c:member:`sk_buff.users` is a simple refcount allowing multiple entities |
| to keep a struct sk_buff alive. skbs with a ``sk_buff.users != 1`` are referred |
| to as shared skbs (see skb_shared()). |
| |
| skb_clone() allows for fast duplication of skbs. None of the data buffers |
| get copied, but caller gets a new metadata struct (struct sk_buff). |
| &skb_shared_info.refcount indicates the number of skbs pointing at the same |
| packet data (i.e. clones). |
| |
| dataref and headerless skbs |
| --------------------------- |
| |
| .. kernel-doc:: include/linux/skbuff.h |
| :doc: dataref and headerless skbs |
| |
| Checksum information |
| -------------------- |
| |
| .. kernel-doc:: include/linux/skbuff.h |
| :doc: skb checksums |
