iptfs_encap_add_ipv6(9)

okay bestie, welcome to the Kernel API Manual page for iptfs_encap_add_ipv6(9) — yes, the outer-encaps one. Grab a strawberry 🍓 and let’s go.

🌸 NAME 🌸

iptfs_encap_add_ipv6 — add outer encaps. That’s the whole assignment, no cap. 💅

✨ SYNOPSIS ✨

int iptfs_encap_add_ipv6 (struct xfrm_state *x , struct sk_buff *skb );

🎀 ARGUMENTS 🎀

• x — the xfrm state.
• skb — the packet.

💜 DESCRIPTION 💜

okay so this was originally taken from xfrm6_tunnel_encap_add. Not a random copy-paste moment, bestie — the reason for the copy is that IP-TFS/AGGFRAG can have different functionality for how to set the flow label and TOS/DSCP bits.

It also sets the protocol to a different value and doesn’t do anything with inner headers as they aren’t pointing into a normal IP singleton inner packet. That’s the tea ☕✨

🦋 RETURN 🦋

0 on success or a negative error code on failure. Slay. ✅

🌈 SEE ALSO 🌈

Kernel file to check out: ./net/xfrm/xfrm_iptfs.c.

The rest of the gang:

• 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_prepare_output(9)
• __iptfs_get_inner_mtu(9)
• iptfs_get_inner_mtu(9)
• iptfs_user_init(9)

✨ sign-off bestie: source/version ./net/xfrm · date October 2026 · page iptfs_encap_add_ipv6(9) — bye, go slay those encaps 💅🫶