ip6_tnl_parse_tlv_enc_lim(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ip6_tnl_parse_tlv_enc_lim(9)

okay bestie, welcome to the Kernel API Manual ✨ — this one's a kernel function page, lowercase-name-core, and it's literally all about handling the encapsulation limit option. no cap. let's get into it 🫶

🌸 NAME 🌸

ip6_tnl_parse_tlv_enc_lim — handle encapsulation limit option 🎀

like, that's the whole gig. it handles the encapsulation limit option. iconic behavior honestly.

✨ SYNOPSIS ✨

__u16 ip6_tnl_parse_tlv_enc_lim (struct sk_buff *skb , __u8 *raw );

that's the exact signature, don't @ me 💅 — __u16 in, __u16 out, it's giving tidy.

🦋 ARGUMENTS 🦋

  • skb — received socket buffer. yes bestie, the skb, the main character of every networking function ever 👑
  • raw — the ICMPv6 error message data. this is where the data lives 🍓

⭐ RETURN ⭐

returns 0 if none was found 👀 — otherwise it returns the index to encapsulation limit. so like, zero means "nope, nothing here", and anything else is the actual answer. periodt 💀

💜 SEE ALSO 💜

this function is not doing this alone, she's got a whole friend group fr fr. all of these live in the kernel file ./net/ipv6/ip6_tunnel.c:

go read all of them, i'll wait 💖 (jk, but like, they're all in ./net/ipv6 so at least you know where to look 🧚)

also this page lives under ./net/ipv6 and it's dated October 2026 — yes, future girl autumn 🌈 — and it came out of the Kernel API Manual source, so that's the vibe check on provenance 💅</p>

mwah, that's the whole page, slay, go parse those TLVs, and remember: 0 means none found 😭💜

📦 where this page comes from