skb_shared(9)

🌸 skb_shared(9) — Kernel API Manual 🌸

okay so bestie, welcome to the skb_shared page, straight out of the Kernel API Manual 💖 this one is short and sweet and honestly kind of iconic for it — no giant wall of text, just one clean little question: is anybody else holding a ref to this buffer? let's get into it 💅

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✨ NAME ✨

skb_shared — is the buffer shared

like… that's the whole name. that's the whole vibe. 🦋

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✨ SYNOPSIS ✨

int skb_shared (const struct sk_buff *skb );

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✨ ARGUMENTS ✨

• skb — the buffer you wanna check 🎀 this is the thing you're asking about, the little guy you're side-eyeing.

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✨ DESCRIPTION ✨

Returns true if more than one person has a reference to this buffer. 👑

that's it. that's the function. it's giving "are we sharing this or is it all mine" energy — you hand it an skb and it tells you whether the refcount situation is >1 (shared, be careful, other people are looking at this memory too) or not (just you, main character energy, do what you want). ngl the simplicity is lowkey iconic — one question, one answer, no drama 💀✨

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✨ SEE ALSO ✨

okay this is the part where the page goes absolutely feral — the related-pages list is long long, so buckle up bestie, we're reading the whole thing fr fr 🫶

Still chilling in the kernel file ./include/linux/skbuff.h, and these skb checksums(9) friends:

skb_frag_size(9), skb_frag_size_set(9), skb_frag_size_add(9), skb_frag_size_sub(9), skb_frag_must_loop(9), skb_frag_foreach_page(9), struct skb_shared_hwtstamps(9), dataref and headerless skbs(9), Basic sk_buff geometry(9), struct sk_buff(9), skb_pfmemalloc(9), skb_dst(9), skb_dstref_steal(9), skb_dstref_restore(9), skb_dst_set(9), skb_dst_set_noref(9), skb_dst_is_noref(9), skb_napi_id(9), skb_unref(9), kfree_skb(9), alloc_skb(9), skb_fclone_busy(9), alloc_skb_fclone(9), skb_pad(9), skb_queue_empty(9), skb_queue_empty_lockless(9), skb_queue_is_last(9), skb_queue_is_first(9), skb_queue_next(9), skb_queue_prev(9), skb_get(9), skb_cloned(9), skb_header_cloned(9), __skb_header_release(9), skb_share_check(9), skb_unshare(9), skb_peek(9), __skb_peek(9), skb_peek_next(9), skb_peek_tail(9), skb_queue_len(9), skb_queue_len_lockless(9), __skb_queue_head_init(9), skb_queue_splice(9), skb_queue_splice_init(9), skb_queue_splice_tail(9), skb_queue_splice_tail_init(9), __skb_queue_after(9), __skb_queue_head(9), __skb_queue_tail(9), __skb_dequeue(9), __skb_dequeue_tail(9), skb_len_add(9), __skb_fill_netmem_desc(9), skb_fill_page_desc(9), skb_fill_page_desc_noacc(9), skb_headroom(9), skb_tailroom(9), skb_availroom(9), skb_reserve(9), skb_tailroom_reserve(9), skb_reset_transport_header_careful(9), skb_set_transport_header_careful(9), pskb_trim_unique(9), skb_orphan(9), skb_orphan_frags(9), __skb_queue_purge_reason(9), netdev_alloc_frag(9), netdev_alloc_skb(9), __dev_alloc_pages(9), __dev_alloc_page(9), dev_page_is_reusable(9), skb_propagate_pfmemalloc(9), skb_frag_off(9), skb_frag_off_add(9), skb_frag_off_set(9), skb_frag_off_copy(9), skb_frag_net_iov(9), skb_frag_page(9), skb_frag_netmem(9), skb_frag_address(9), skb_frag_address_safe(9), skb_frag_phys(9), skb_frag_page_copy(9), __skb_frag_dma_map(9), skb_clone_writable(9), skb_cow(9), skb_cow_head(9), skb_padto(9), __skb_put_padto(9), skb_put_padto(9), skb_linearize(9), skb_has_shared_frag(9), skb_linearize_cow(9), skb_postpull_rcsum(9), skb_postpush_rcsum(9), skb_push_rcsum(9), pskb_trim_rcsum(9), skb_needs_linearize(9), skb_get_timestamp(9), skb_data_move(9), skb_postpull_data_move(9), skb_postpush_data_move(9), skb_complete_tx_timestamp(9), skb_tstamp_tx(9), skb_tx_timestamp(9), skb_complete_wifi_ack(9), skb_checksum_complete(9), struct skb_ext(9), skb_checksum_none_assert(9), skb_head_is_locked(9)

like. that's the whole guest list. every single one of them showed up to the party 🔥 no gatekeeping, no plus-one limits 💜

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and yeah — if you were wondering, this page lives in ./include/linux, dated October 2026, and it's filed under skb_shared(9). 🎀 mwah, that's the wrap bestie, go be safe with your refcounts 💖✨🌸