iw_cm_map(9)

💅 iw_cm_map — bestie's guide to port mapping 💅

Okay so this is iw_cm_map, from the kernel API manual (section 9, the kernel-flavored one 🧚). Buckle up, it's shorter than your Situationship's attention span but every word matters, fr fr.

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✨ NAME ✨

iw_cm_map — the one that uses portmapper to map the ports 🗺️✨

Basically: portmapper does the mapping, and this is the function that asks it nicely.

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🌸 SYNOPSIS 🌸

int iw_cm_map(struct iw_cm_id *cm_id, bool active);

Two (2) whole arguments. Iconic. Minimalist. Slay. 💅

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🎀 ARGUMENTS 🎀

• cm_id — connection manager pointer 🫶. That's the connection-manager thingy you're handing over.
• active — tells us whether we're on the active side. When it's true (so, active side, bestie), the function returns nonzero for error only if iwpm_create_mapinfo fails 💀. Like, that's the only failure it's gonna flag. Noted!

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🦋 DESCRIPTION 🦋

So what it does: it tries to add a mapping for a port using the Portmapper. That's the whole bit. Try, map, hope it works. 🤞

And then — this is the cute part — if it successfully mapped the IP/Port, it goes and checks the remote mapped IP address for a wildcard IP address 👀. And if it finds one? It replaces that zero IP address with the remote_addr. Wildcard found → swipe left → swapped out for the real remote address. Main character behavior, honestly. 👑

Heads up bestie: the replace-the-zero-IP-with-remote_addr thing only happens after a successful IP/Port mapping. No mapping, no wildcard check. Don't skip steps. 🌈

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/infiniband/core/iwcm.c — go read the source, it's giving lore 📖
• iw_cm_check_wildcard(9) — the wildcard-checking sibling 🧚✨ iykyk

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And that's the whole page, no cap. Source/version bit: this comes from ./drivers/infiniband/core, dated October 2026 💖 — shoutout to the kernel maintainers, you ate 🍓✨ 🫶