iptfs_prepare_output(9)

💖 NAME 💖

okay so bestie, this is iptfs_prepare_output from the Kernel API Manual — it's the function that prepares the skb for output. iconic behavior only. 🎀✨

✨ SYNOPSIS ✨

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

🦋 ARGUMENTS 🦋

• x — xfrm state. literally the xfrm_state, no cap. 💅
• skb — the packet. the packet itself, bestie. 🫶

🔥 RETURN 🔥

It gives back an error value. If it comes back 0, then the skb values should be set up like this, periodt:

• transport_header should point at the ESP header
• network_header should point at the Outer IP header
• mac_header should point at protocol/nexthdr of the outer IP

🌈 SEE ALSO 🌈

Kernel file ./net/xfrm/xfrm_iptfs.c, plus all these iconic little besties:

• 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_input(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_get_inner_mtu(9)
• iptfs_get_inner_mtu(9)
• iptfs_user_init(9)

mwah 💅 — that’s the whole page, bestie! source/version: ./net/xfrm; date: October 2026; page: iptfs_prepare_output(9); manual: Kernel API Manual. 🫶✨