mptcp_token_new_connect(9)

💅 mptcp_token_new_connect — kernel API realness ✨

okay so bestie, this one lives in the Kernel API Manual and it's literally the function that kicks off a brand-new outgoing MPTCP connection 🫶

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🌸 NAME 🌸

mptcp_token_new_connect — create new key/idsn/token for subflow 💖

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✨ SYNOPSIS ✨

int mptcp_token_new_connect (struct sock *ssk );

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🎀 ARGUMENTS 🎀

• ssk — the socket that will initiate a connection 👑 that's the main character right there

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🦋 DESCRIPTION 🦋

So this function gets called when a new outgoing mptcp connection is initiated 💫 like, the moment a fresh connection is trying to leave the house, this is the vibe check it goes through.

It creates a unique token to identify the new mptcp connection, a secret local key and the initial data sequence number (idsn) 🔥 three little besties, one function.

On success, the mptcp connection can be found again using the computed token at a later time, this is needed to process join requests 🌈 no cap, that token is the whole point — it's how the connection gets recognized later when join requests come knocking.

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⭐ RETURN ⭐

0 on success 💅 that's it, that's the whole return situation.

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🌟 SEE ALSO 🌟

Kernel file ./net/mptcp/token.c — plus the whole friend group:

• mptcp_token_new_request(9)
• mptcp_token_accept(9)
• mptcp_token_get_sock(9)
• mptcp_token_iter_next(9)
• mptcp_token_destroy_request(9)
• mptcp_token_destroy(9)

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ngl bestie, if you're messing with tokens, read the friends too — they're all in the same file and they all ate 💀✨

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that's the whole page, mwah 💋 it lives in ./net/mptcp, dated October 2026, straight from the Kernel API Manual — go off and make some iconic connections 🧚‍♀️💜