skb_frag_address_safe(9)

💅 skb_frag_address_safe — a Kernel API Manual moment ✨

okay bestie, listen. this one is from the Kernel API Manual (yes, the whole manual, we're fancy now) and it's a tiny little function that does exactly one job and does it safely. icon behavior, honestly.

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🌸 NAME 🌸

skb_frag_address_safe — gets the address of the data contained in a paged fragment

like… it hands you the address. safely. that's the whole vibe. 🫶

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✨ SYNOPSIS ✨

void * skb_frag_address_safe (const skb_frag_t *frag );

that's it. that's the whole signature. no cap, she's compact. 💅

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🎀 ARGUMENTS 🎀

• frag — the paged fragment buffer. this is the thing you're pointing at, bestie. const, so you're just looking, not touching. respectful. 🙈

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💖 RETURN 💖

returns the address of the data within frag.

but — and this is the main character detail — it checks that the page is mapped first, and returns NULL otherwise. so if the page isn't mapped, you get NULL, not a crash, not chaos, not a segfault at 3am. it's giving responsible. it's giving safe. 🔥

ngl, that NULL check is the entire reason the _safe is in the name. if you see NULL come back, the page wasn't mapped. periodt.

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🦋 SEE ALSO 🦋

the source file lives at kernel file ./include/linux/skbuff.h — that's where the realest of the skb lore is kept 🧚

and then there's the extended family, fr fr, every single one of them:

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_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_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)

like, that is a whole friend group. iykyk. 👑

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and that's the page!! 🍓

cute little sign-off for the girlies who read to the bottom: this beauty lives over in ./include/linux and the version we're looking at is dated October 2026 — screenshot it, memorize it, live it. mwah. 💜🌸✨