ipv6_mc_check_mld(9)

💖 ipv6_mc_check_mld(9) 💖

okay bestie, welcome to the Kernel API Manual page for ipv6_mc_check_mld(9) — yes, the title is right there and we’re folding the manual name in near the top like a little name tag 🫶

✨ NAME ✨

ipv6_mc_check_mld — checks whether this is a sane MLD packet. Literally a vibe check for MLD packets 💅

🌸 SYNOPSIS 🌸

int ipv6_mc_check_mld (struct sk_buff *skb );

🎀 ARGUMENTS 🎀

• skb — the skb to validate. This is the packet cutie getting inspected 🕵️‍♀️

🦋 DESCRIPTION 🦋

So this function checks whether an IPv6 packet is a valid MLD packet. If it is, it sets the skb transport header accordingly and returns zero — slay, success, no notes ✨

If something’s off, you get one of these error returns:

• -EINVAL — a broken packet was detected, i.e. it violates some internet standard. Not iconic behavior 😭
• -ENOMSG — IP header validation succeeded but it is not an ICMPv6 packet with a hop-by-hop option.
• -ENODATA — IP+ICMPv6 header with hop-by-hop option validation succeeded but it is not an MLD packet.
• -ENOMEM — a memory allocation failure happened. The allocation said “not today” 💀

Bestie, important caller note: the caller needs to set the skb network header and free any returned skb if it differs from the provided skb. Do not forget, fr fr 🫶

🌈 SEE ALSO 🌈

Kernel file ./net/ipv6/mcast_snoop.c — go peek if you’re curious 👀

mwah 💋 this page is from ./net/ipv6, dated October 2026, and it’s serving Kernel API Manual realness. Bye bestie! 🎀💖