skb_get_timestamp(9)

💅 skb_get_timestamp(9) — Kernel API Manual, section 9 🎀

okay so bestie, welcome to the Kernel API Manual, section 9, and we're talking about skb_get_timestamp — and yes it's way less scary than the name sounds, i promise 🫶

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✨ NAME ✨

skb_get_timestamp — get timestamp from a skb. that's it. that's the whole vibe check, she does exactly what she says 💖

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🦋 SYNOPSIS 🦋

void skb_get_timestamp (const struct sk_buff *skb , struct __kernel_old_timeval *stamp );

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🌸 ARGUMENTS 🌸

• skb — the skb you're pulling the stamp out of. like, the source of truth, the main character here 👑
• stamp — a pointer to a struct __kernel_old_timeval, and this is where the stamp gets stored. literally the drop-off address 📬

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💜 DESCRIPTION 💜

okay so this is the important part, listen up 🔥

Timestamps are not stored in the skb as full timestamps — they live in there as offsets to a base timestamp. ngl that's lowkey the whole trick.

What skb_get_timestamp does is convert that offset back into a struct timeval and stash it in stamp. so you hand her an skb, she does the math, and you get a real actual timeval in the struct you pointed at. slay ✨

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🌈 SEE ALSO 🌈

the kernel file is ./include/linux/skbuff.h, and buckle up bestie because this list is long, but every single one of these is here fr fr 💀

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),

and breathe, there's more 😭

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_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 i said. every single one. ate and left no crumbs 💅✨

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🧚 tiny reminder that skb_get_timestamp is converting here, not inventing — the offset math only makes sense against that base timestamp, so don't go treating random numbers as wall-clock time, bestie 🙈

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and that's the whole page!! mwah 💖 this one came out of ./include/linux, dated October 2026 — go forth and get those timestamps, you absolute icon 🎀🦋⭐