__skb_ext_set(9)

💅 __skb_ext_set — the Kernel API Manual, but make it make sense

okay bestie, so this is a page straight out of the Kernel API Manual, and it's genuinely short and sweet — a little three-argument function that glues extension storage onto an skb. Let's get into it 🎀

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✨ NAME ✨

__skb_ext_set — literally "attach the specified extension storage to this skb" 💖 that's the whole job, no cap.

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🦋 SYNOPSIS 🦋

void * __skb_ext_set (struct sk_buff *skb , enum skb_ext_id id , struct skb_ext *ext );

look at her, she's serving void * realness — she gives you back a pointer, icon behaviour ✨

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🎀 ARGUMENTS 🎀

• skb — the buffer. yeah, that one. the whole reason we're here 🫶
• id — the extension id, aka which slot on the extension shelf you're pointing at 💅
• ext — the extension storage itself, and hear me out: it has to be storage that was previously allocated via __skb_ext_alloc 👑 no DIY storage, no vibes-based pointers, okay?

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💜 DESCRIPTION 💜

so here's the tea ☕ — existing extensions, if any, are cleared. like, gone. wiped. don't come crying to me if you had something in there 🙈

and then, bestie, she returns the pointer to the extension 🌸 that's it, that's the function, main character energy fr fr.

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🌈 SEE ALSO 🌈

kernel file ./net/core/skbuff.c — plus a whole friend group of skb function girlies, iykyk ✨

• drop_reasons_register_subsys(9), drop_reasons_unregister_subsys(9), skb_panic(9), napi_skb_cache_get_bulk(9), __build_skb(9), build_skb_around(9), __napi_build_skb(9), napi_build_skb(9), __alloc_skb(9), __netdev_alloc_skb(9), napi_alloc_skb(9), skb_pp_cow_data(9), skb_pp_frag_ref(9), __kfree_skb(9), sk_skb_reason_drop(9), skb_tx_error(9), consume_skb(9), __consume_stateless_skb(9), napi_consume_skb(9)
• alloc_skb_for_msg(9), skb_morph(9), skb_copy_ubufs(9), skb_clone(9), skb_copy(9), __pskb_copy_fclone(9), pskb_expand_head(9), skb_expand_head(9), skb_copy_expand(9), __skb_pad(9), pskb_put(9), skb_put(9), skb_push(9), skb_pull(9), skb_pull_data(9), skb_trim(9), __pskb_pull_tail(9), skb_copy_bits(9), skb_store_bits(9), skb_zerocopy(9)
• skb_dequeue(9), skb_dequeue_tail(9), skb_queue_purge_reason(9), skb_rbtree_purge(9), skb_queue_head(9), skb_queue_tail(9), skb_unlink(9), skb_append(9), skb_split(9), skb_shift(9)
• skb_prepare_seq_read(9), skb_seq_read(9), skb_abort_seq_read(9), skb_copy_seq_read(9), skb_find_text(9), skb_pull_rcsum(9), skb_segment(9), skb_to_sgvec(9), skb_cow_data(9), skb_clone_sk(9)
• skb_partial_csum_set(9), skb_checksum_setup(9), skb_checksum_maybe_trim(9), skb_checksum_trimmed(9), skb_try_coalesce(9), skb_scrub_packet(9), skb_eth_pop(9), skb_eth_push(9), skb_mpls_push(9), skb_mpls_pop(9), skb_mpls_update_lse(9), skb_mpls_dec_ttl(9)
• alloc_skb_with_frags(9), skb_condense(9), __skb_ext_alloc(9), skb_ext_add(9), skb_attempt_defer_free(9), skb_splice_from_iter(9)

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💀 tiny reminder bestie: that ext argument isn't a free-for-all — it's gotta be the storage that came from __skb_ext_alloc. your own random storage will not slay here, it will just break.

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🧚 sign-off 🧚

and that's the page!! brought to you from ./net/core, dated October 2026, filed under __skb_ext_set(9) — go forth and attach those extensions, bestie, you're gonna do amazing 💖✨🎀