iptfs_input(9)

💖 NAME 💖

iptfs_input — handle receipt of iptfs payload

Ok so real talk, this is the Kernel API Manual entry for iptfs_input(9), and it's lowkey the main character of the receiving side of IPTFS. Let's get into it ✨

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🦋 SYNOPSIS 🦋

int iptfs_input (struct xfrm_state *x , struct sk_buff *skb );

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🎀 ARGUMENTS 🎀

• x — the xfrm state, bestie. it's giving "who am I and what are my parameters" energy 💅
• skb — the packet itself. the actual little guy we're dealing with 🫶

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🌸 DESCRIPTION 🌸

okay so picture this: we've got an IPTFS payload, right? we order it if needed, and then we process the newly in-order packets. that's the whole vibe. reorder first, then handle whatever just became processable. no cap, that's literally the job 💜

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⭐ RETURN ⭐

returns -EINPROGRESS to inform xfrm_input to stop processing the skb. yes bestie, that's the signal, that's the whole point — we're telling xfrm_input to chill and stop touching the skb 🙈

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🌈 SEE ALSO 🌈

• Kernel file ./net/xfrm/xfrm_iptfs.c
• IPTFS_DEFAULT_DROP_TIME_USECS(9)
• IPTFS_DEFAULT_REORDER_WINDOW(9)
• IPTFS_DEFAULT_INIT_DELAY_USECS(9)
• IPTFS_DEFAULT_MAX_QUEUE_SIZE(9)
• struct xfrm_iptfs_config(9)
• struct xfrm_iptfs_data(9)
• iptfs_alloc_skb(9)
• iptfs_skb_head_to_frag(9)
• struct iptfs_skb_frag_walk(9)
• iptfs_skb_prepare_frag_walk(9)
• iptfs_skb_can_add_frags(9)
• iptfs_skb_add_frags(9)
• iptfs_pskb_add_frags(9)
• iptfs_pskb_extract_seq(9)
• iptfs_input_save_runt(9)
• __iptfs_iphlen(9)
• __iptfs_iplen(9)
• iptfs_complete_inner_skb(9)
• iptfs_reassem_abort(9)
• iptfs_reassem_done(9)
• iptfs_reassem_cont(9)
• iptfs_input_ordered(9)
• iptfs_drop_timer(9)
• iptfs_enqueue(9)
• iptfs_copy_create_frag(9)
• iptfs_copy_create_frags(9)
• iptfs_first_skb(9)
• iptfs_encap_add_ipv4(9)
• iptfs_encap_add_ipv6(9)
• iptfs_prepare_output(9)
• __iptfs_get_inner_mtu(9)
• iptfs_get_inner_mtu(9)
• iptfs_user_init(9)

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ngl that's a whole lot of functions, but every single one of them said "i'm in this photo and i don't like it" — go read them, iykyk 💀

and that's the whole page, bestie!! this one's from the ./net/xfrm section, dated October 2026, and it's the iptfs_input(9) entry — slay, go reorder some packets, periodt 💅✨🎀