llc_pdu_init_as_xid_cmd(9)

💅 llc_pdu_init_as_xid_cmd — from the Kernel API Manual (section 9, bestie)

okay so picture this: you're deep in kernel-land, right, and there's this little function called llc_pdu_init_as_xid_cmd and honestly? it has one job and it does it immaculately. It's the "sets bytes 3, 4 & 5 of LLC header as XID" girlie. That's the whole name, that's the whole vibe. 🎀

---

✨ SYNOPSIS ✨

void llc_pdu_init_as_xid_cmd (struct sk_buff *skb , u8 svcs_supported ,
       u8 rx_window );

notice how it's void? yeah, it gives you nothing back. no return value, no little treat, it just does its thing to the skb and dips. main character behavior honestly 💅

---

🌸 ARGUMENTS 🌸

• skb — the input skb, aka the packet whose header needs to get set up. it's giving "put the header in here please." 🫶
• svcs_supported — the class of the LLC. your options are I or II, and that's it, that's the menu. 🍓
• rx_window — the size of the receive window of the LLC. just a number letting everyone know how much room there is to work with. ✨

---

🦋 DESCRIPTION 🦋

so what does it actually do? bestie, it sets the third, fourth, fifth and sixth bytes of the LLC header as a XID PDU. that's it. that's the whole function. no cap, no plot twist, no drama — just bytes getting placed exactly where they belong and looking iconic while doing it. 👑

quick heads up: the NAME up top says bytes 3, 4 & 5, and the DESCRIPTION says third, fourth, fifth and sixth. both of those are straight from the source, so I'm not gonna gaslight you by picking one — that's just how it's written, periodt. 💀

---

💜 SEE ALSO 💜

okay the friend group is large and they all showed up to support:

• the kernel file ./include/net/llc_pdu.h — the mothership, the home base, the address book 🏠
• llc_pdu_header_init(9)
• llc_pdu_decode_sa(9)
• llc_pdu_decode_da(9)
• llc_pdu_decode_ssap(9)
• llc_pdu_decode_dsap(9)
• llc_pdu_init_as_ui_cmd(9)
• llc_pdu_init_as_test_cmd(9)
• llc_pdu_init_as_test_rsp(9)
• llc_pdu_init_as_xid_rsp(9) — yes, there's a response one too, she has a sibling, they're both slaying 🌈

---

and that's the page, bestie!! sourced from ./include/net, dated October 2026, and filed under llc_pdu_init_as_xid_cmd(9) in the Kernel API Manual. go forth and set those header bytes, ily, don't forget to vibe check your skb first 💖🧚⭐