skb_has_shared_frag(9)

💅 skb_has_shared_frag 💅

okay so bestie, welcome to a section 9 kernel API man page (skb_has_shared_frag(9), if we're being formal) — this one is short and sweet and honestly kind of iconic for how much it does with one question. Let's get into it 🫶

---

🎀 NAME 🎀

skb_has_shared_frag — can any frag be overwritten

like. that's the whole vibe. it's a yes/no gut-check on whether some frag in your skb is out here living its best shared life and could get rewritten by somebody else. 😭

---

✨ SYNOPSIS ✨

bool skb_has_shared_frag (const struct sk_buff *skb );

a bool going in, a const struct sk_buff *skb going in, and yes the space before the closing paren is literally part of the source, we do not touch it, periodt 💅

---

🌸 ARGUMENTS 🌸

• skb — buffer to test. that's it. that's the whole argument. hand it your skb and let it do its little vibe check 🔍

---

⭐ RETURN ⭐

returns true if the skb has at least one frag that might be modified by an external entity (as in vmsplice/sendfile) 👑

so like — if anything outside your own code could reach in and mess with a frag, this tells you true. no cap, that's the entire contract. 🦋

---

👑 SEE ALSO 👑

bestie there are SO many cousins, I'm not kidding, this function has the biggest family group chat in ./include/linux/skbuff.h. kernel file ./include/linux/skbuff.h skb checksums(9), 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_shared(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_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)

go read them all, iykyk 🌈✨

---

that's the whole page, bestie — short, sweet, and it ate 💖 this one lives under ./include/linux, dated October 2026 (version vibes: kernel API manual, section 9), and it's signed skb_has_shared_frag(9) like a little autograph at the bottom 🎀🦋 slay, bye! 👋