pskb_put(9)

okay bestie, this is pskb_put(9) from the Kernel API Manual, and it's giving “add data to the tail of a potentially fragmented buffer” with zero chill. let's go 💅✨

💖 NAME 💖

pskb_put — add data to the tail of a potentially fragmented buffer. no cap, that's the whole name, and it ate.

✨ SYNOPSIS ✨

void * pskb_put (struct sk_buff *skb , struct sk_buff *tail , int len );

🎀 ARGUMENTS 🎀

• skb — start of the buffer to use. your main character buffer, basically.
• tail — tail fragment of the buffer to use. the final-fragment bestie.
• len — amount of data to add. the size of the extra data moment.

🦋 DESCRIPTION 🦋

so this function extends the used data area of the potentially fragmented buffer. yes, the whole “fragmented” situation is the point — it's not scared of a buffer that's split into pieces. 💅

real talk: tail must be the last fragment of skb -- or skb itself. like, not a random middle fragment, not your ex, not some other buffer. the last one, or the og. iykyk.

⚠️ if this would exceed the total buffer size, the kernel will panic. not a cute little error, not a vibe check, an actual panic. so maybe don't do that, bestie 😭

and the payoff? a pointer to the first byte of the extra data is returned. periodt. 🫶

🌈 SEE ALSO 🌈

Kernel file ./net/core/skbuff.c — plus the whole skb cinematic universe, fr fr:

• 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), 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_set(9), skb_ext_add(9), skb_attempt_defer_free(9), skb_splice_from_iter(9)

okay that's the whole page, bestie. source/version: ./net/core; date: October 2026; manual page: pskb_put(9). bye, slay, hydrate, and don't overflow the buffer 💖🎀🦋