gss_check_seq_num(9)

💅 gss_check_seq_num — a kernel API girly pops off

Okay bestie, so this is a page from the Kernel API Manual and the star of the show is gss_check_seq_num(9). Like, yes, the whole manual is literally named after her. Main character energy fr fr. 🎀

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✨ NAME ✨

gss_check_seq_num — the GSS sequence number window check, aka the little vibe check your sequence numbers have to pass 🦋

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🌸 SYNOPSIS 🌸

bool gss_check_seq_num (const struct svc_rqst *rqstp , struct rsc *rsci
, u32 seq_num );

That's the whole fit. One bool return, three args, no cap. 💜

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🌈 ARGUMENTS 🌈

• rqstp — the RPC Call, and it's the one we point at when we gotta report errors. Like, if something's wrong, this is the receipts. 📋
• rsci — the cached GSS context state. Heads up bestie: it gets updated on return, so she's not the same girl she was going in. 🙈
• seq_num — the sequence number we're checking. The actual number to vibe check. 🔥

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👑 DESCRIPTION 👑

So what does she actually do? She implements the sequence number algorithm exactly as specified in RFC 2203, Section 5.3.3.1. "Context Management". Periodt. That's the spec, we're not improvising here. ✨

Here's the tea on the return values:

• true — rqstp's GSS sequence number is inside the window. Slay, you're in. 🫶
• false — rqstp's GSS sequence number is outside the window. Sorry babe, no entry. 💀

It's giving bouncer at the club but for sequence numbers. Windows open, windows closed. iykyk. 🧚

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💖 SEE ALSO 💖

Go read up on your faves, bestie:

• Kernel file ./net/sunrpc/auth_gss/svcauth_gss.c
• svcauth_gss_accept(9)
• svcauth_gss_release(9)

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Mwah 💋 — this iconic little page lives in ./net/sunrpc/auth_gss, dated October 2026, and it's signed gss_check_seq_num(9). Go off, queen. 👑⭐