llc_find_sap_trans(9)

💅 llc_find_sap_trans(9) 💅

okay so bestie, you're reading a page from the Kernel API Manual and it's literally about llc_find_sap_trans — the little function that finds a transition for an event. yes that's the whole vibe. let's get into it 🦋

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✨ NAME ✨

llc_find_sap_trans — finds transition for event 🎯

🌸 SYNOPSIS 🌸

const struct llc_sap_state_trans * llc_find_sap_trans (struct llc_sap
*sap , struct sk_buff *skb );

like… it returns a const struct llc_sap_state_trans *, and it takes a sap and an skb. that's the signature, don't @ me, copy it exactly ✨

🎀 ARGUMENTS 🎀

• sap — pointer to SAP. yes babe, it's a pointer, and it points at a SAP. iconic 👑
• skb — the happened event. it's the thing that happened. the event. that one. 💫

💖 DESCRIPTION 💖

so what this function does: it finds the transition that matches with the happened event. like, event happens → function goes looking for the transition that goes with it. that's the whole plot 🍓

and the return? it returns the pointer to the found transition on success, or NULL for failure. literally that's it. NULL means no luck, bestie 😭

ngl, NULL on failure is the entire failure story here — no error codes, no drama, just a sad little NULL 🫶

🌈 SEE ALSO 🌈

the kernel file is ./net/llc/llc_sap.c, and honestly you should also peek at these besties:

• llc_alloc_frame(9)
• llc_sap_rtn_pdu(9)
• llc_exec_sap_trans_actions(9)
• llc_sap_next_state(9)
• llc_sap_state_process(9)
• llc_build_and_send_test_pkt(9)
• llc_build_and_send_xid_pkt(9)
• llc_sap_rcv(9)
• llc_lookup_dgram(9)
• llc_sap_mcast(9)

like a whole friend group, fr fr 💜

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and that's the page!! this one ships out of ./net/llc, dated October 2026, and it's filed under llc_find_sap_trans(9) — mwah, go read some kernel source bestie 💅✨🎀