skb_copy_bits(9)

✨ NAME ✨

From the Kernel API Manual, bestie: skb_copy_bits(9) — the function that copies bits from an skb to a kernel buffer. That’s the whole name, no cap. 💖

🌸 SYNOPSIS 🌸

int skb_copy_bits (const struct sk_buff *skb , int offset , void *to ,
       int len );

🎀 ARGUMENTS 🎀

• skb — source skb. Like, the actual source skb; she’s the main character here. 💅
• offset — offset in source. Where the copy starts inside the source, periodt.
• to — destination buffer. The destination buffer, aka where the copied bits are going. 🫶
• len — number of bytes to copy. The amount. The length. The vibe. ✨

🦋 DESCRIPTION 🦋

Okay so the serve is: copy the specified number of bytes from the source skb to the destination buffer. That’s it — iconic, focused, ate. 💖

CAUTION ! : If its prototype is ever changed, check arch/{*}/net/{*}.S files, since it is called from BPF assembly code.

Do not skip that one, bestie — it’s giving important lore. 😭🔥

🔥 SEE ALSO 🔥

Kernel file ./net/core/skbuff.c is the home base, and the whole friend group is: 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_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)

mwah 💋 — source/version: ./net/core · date: October 2026 · page: skb_copy_bits(9). Go copy those bits, bestie 💖🦋