bpf_dynptr_from_skb_meta(9)

🦋 bpf_dynptr_from_skb_meta 🦋

okay bestie, welcome to the Kernel API Manual ✨ this page is literally about setting up a dynptr so you can vibe with skb metadata. no cap 💅

🌸 NAME 🌸

bpf_dynptr_from_skb_meta — initialize a dynptr to the skb metadata area. periodt.

🎀 SYNOPSIS 🎀

__bpf_kfunc int bpf_dynptr_from_skb_meta (struct __sk_buff *skb_ , u64
       flags , struct bpf_dynptr *ptr__uninit );

💅 ARGUMENTS 💅

• skb_ — the socket buffer carrying the metadata. main character energy fr 🫶
• flags — future use, must be zero. no funny business, bestie 🫠
• ptr__uninit — the dynptr to initialize. get it ready ✨

🌟 DESCRIPTION 🌟

Set up a dynptr for access to the metadata area earlier allocated from the XDP context with bpf_xdp_adjust_meta. This serves as an alternative to __sk_buff->data_meta. lowkey iconic, iykyk 💖

🔥 RETURN 🔥

• 0 — dynptr ready to use. slay ✨
• -EINVAL — invalid flags, dynptr set to null. not the vibe, but important 🫠

🌈 SEE ALSO 🌈

okay so the whole squad is here, bestie 👑

• Kernel file ./net/core/filter.c
• sk_filter_trim_cap(9)
• bpf_convert_filter(9)
• bpf_check_classic(9)
• sk_filter_release_rcu(9)
• sk_filter_release(9)
• bpf_prog_create(9)
• bpf_prog_create_from_user(9)
• sk_attach_filter(9)
• xdp redirect(9)
• bpf_skb_meta_pointer(9)
• bpf_xdp_pull_data(9)
• bpf_icmp_send(9)

mwah 💋 — source/version ./net/core, date October 2026, bestie 🫶