iptfs_skb_can_add_frags(9)

🎀 NAME 🎀

Bestie, we’re on the iptfs_skb_can_add_frags(9) page in the Kernel API Manual, and this one is short but iconic: iptfs_skb_can_add_frags — check if ok to add frags from walk to skb. That’s the whole vibe check, no cap.

✨ SYNOPSIS ✨

bool iptfs_skb_can_add_frags (const struct sk_buff *skb , struct
       iptfs_skb_frag_walk *walk , u32 offset , u32 len );

🌸 ARGUMENTS 🌸

• skb — the skb to check for adding frags to. Like, this is the one we’re asking about before we start adding stuff 💅
• walk — the walk that will be used as source for frags. It’s literally the source supply for the frags.
• offset — offset from beginning of original skb to start from. So it tells you where in the original skb this starts from.
• len — amount of data to add frag references to in skb. Basically how much data in the skb is getting frag references added to it.

💖 RETURN 💖

It returns true if ok to add frags. That’s the answer the page gives: true means ok to add frags. Periodt.

🦋 SEE ALSO 🦋

Kernel file ./net/xfrm/xfrm_iptfs.c, plus the whole friend group:

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

xoxo, signing off from ./net/xfrm, dated October 2026, on the iptfs_skb_can_add_frags(9) page 💅🫶