skb_push(9)

🌸 NAME 🌸

okay so this is the skb_push(9) page from the Kernel API Manual, and bestie, it’s short but it’s iconic. The whole serve: skb_push — add data to the start of a buffer. No cap. 💅

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✨ SYNOPSIS ✨

This is the entire synopsis, crystal clear, fr fr:

void * skb_push (struct sk_buff *skb , unsigned int len );

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🎀 ARGUMENTS 🎀

• skb — the buffer to use, bestie. That’s the one we’re working with. 🫶
• len — the amount of data to add. Yep, that many bytes of extra-data energy. ✨

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💖 DESCRIPTION 💖

So here’s the vibe: this function extends the used data area of the buffer at the buffer start. It’s giving “make room at the front,” lowkey. 🦋

⚠️ Important, no cap: if this would exceed the total buffer headroom, the kernel will panic. Like, actual kernel panic. Not a vibe check. Not a cute little warning. Panic. 💀

A pointer to the first byte of the extra data is returned. That’s the return value, bestie — void *, first byte of the extra data. Periodt. 👑

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🦋 SEE ALSO 🦋

Okay so the SEE ALSO section ate and left no crumbs — here’s the whole squad, every single one, exactly as listed. 🌈

• Kernel file: ./net/core/skbuff.c 🧚
• 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_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_set(9), skb_ext_add(9), skb_attempt_defer_free(9), skb_splice_from_iter(9).

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xoxo, your kernel bestie 🫶 — source/version: ./net/core, date: October 2026, and yes bestie, this is the skb_push(9) page from the Kernel API Manual. periodt. 💜