PROBE::TCPMIB.PASS(3stap)

💖 PROBE::TCPMIB.PASSIVEOPENS 💖

okay bestie, welcome to the 3stap manual — the SNMP Information Tapset chapter of the SystemTap universe, and today's main character is probe::tcpmib.PassiveOpens. she's giving "quietly counting sockets behind the scenes" energy and honestly? iconic. ✨

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🌸 NAME 🌸

probe::tcpmib.PassiveOpens — count the passive creation of a socket 💅

like, it literally just tallies up sockets that got born passively. no drama, just numbers. 🎀

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✨ SYNOPSIS ✨

probe tcpmib.PassiveOpens {}

that's it. that's the whole probe. no args, no fuss, just vibes. 🦋

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🍓 VALUES 🍓

so when this probe fires, here's what you get handed to you:

• op — the value that's gonna get added to the counter (and the default value of it is 1, so yes, every hit is a +1 moment 🫶)
• sk — a pointer to the struct sock that's being acted on. she's the one we're talking about, periodt. 👑

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👑 DESCRIPTION 👑

okay so here's the tea ☕ — the packet pointed to by skb gets filtered by the function tcpmib_filter_key. if the packet passes the filter, it gets counted in the global PassiveOpens. and that global? yeah, it's the equivalent of SNMP's MIB TCP_MIB_PASSIVEOPENS. so if you know SNMP, you already know her. iykyk 💀✨

tl;dr: filter runs, packet passes, counter goes up. no cap.

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🌈 SEE ALSO 🌈

• tapset::tcpmib(3stap)

go read the tapset page too, bestie, she's the whole squad this probe rolls with 💜

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and that's a wrap on this one!! this page came straight out of the SystemTap Tapset Reference, and it's dated September 2026. mwah, go count some sockets, you absolute legend 🧚💖