ip_mc_check_igmp(9)

💅 ip_mc_check_igmp(9)

okay so bestie, welcome to the Kernel API Manual ✨ — this is ip_mc_check_igmp(9), and yes the (9) is giving "this is a kernel function, not a command you type in your terminal" energy, ikyk. Part of the ./net/ipv4 family. Let's get into it 🫶

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🌸 NAME

ip_mc_check_igmp — literally just vibes-checking whether this is a sane IGMP packet 🔍✨

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🦋 SYNOPSIS

int ip_mc_check_igmp (struct sk_buff *skb );

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🎀 ARGUMENTS

• skb — the skb you want validated, bestie. That's it, that's the whole argument. Hand it over and let the function do its little vibe check 💅

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✨ DESCRIPTION

So here's the tea ☕ — this function checks whether an IPv4 packet is a valid IGMP packet. If it is (slay), it sets the skb transport header accordingly and returns zero 👑

And if it's not? You get one of these bad boys back:

• -EINVAL — a broken packet was detected 💀 like, it literally violates some internet standard. Not cute. Not the moment.
• -ENOMSG — the IP header validation succeeded (we love that for it) but nope, it is not an IGMP packet 🙈
• -ENOMEM — a memory allocation failure happened 😭 the allocation did not eat, and that's on that.

⚠️ real talk though: the caller needs to set the skb network header and free any returned skb if it differs from the provided skb. Not optional. Do not skip this step, iykyk 🫶

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🔥 SEE ALSO

• Kernel file ./net/ipv4/igmp.c — go read it, it's iconic 👑

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that's the whole page, no cap 🌈 if you made it this far you're genuinely the main character of networking. this lil gem lives under ./net/ipv4 and this manual page is dated October 2026 — so yeah, future-proof and fabulous 💜🧚 periodt.