STRUCT STM32_FIREWALL(9)

🎀 NAME 🎀

struct stm32_firewall — it's the lowdown on a device's firewall, bestie. And heads up: one single device can have more than one firewall, so don't come for me when you see a whole list of these. 💅

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✨ SYNOPSIS ✨

struct stm32_firewall {
    struct stm32_firewall_controller *firewall_ctrl;
    u32 extra_args[STM32_FIREWALL_MAX_EXTRA_ARGS];
    const char *entry;
    size_t extra_args_size;
    u32 firewall_id;
 };

Like, that's the whole vibe right there. 🌸

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💖 Members 💖

Okay so let's meet the cast, lower-case field by field, no skips:

• firewall_ctrl — a pointer that references a firewall controller of the device. And the icon of this whole thing is that it's opaque — meaning a device literally cannot mess with the controller's ops or go snooping through the controller's data. Not me protecting the controller's privacy 😭. It's giving locked phone, no cap.
• extra_args — extra arguments, and they are implementation dependent, so like… whatever the implementation feels like, iykyk. Don't ask me to predict them. 💀
• entry — the name of the firewall entry. Just a name. A little string. Main character energy for a label. ✨
• extra_args_size — the number of extra arguments. Yes bestie, a count. Somebody has to keep track. 🫶
• firewall_id — the firewall ID associated the device for this firewall controller. That's your ID, your little number, tied to this controller specifically. 🦋

Fr fr, read the descriptions again if you skimmed — firewall_ctrl being opaque is the important one. A device can't touch the controller's ops or data. That's not a vibe, that's a rule. 💅

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👑 SEE ALSO 👑

Go read the kernel file, it's right here:

./include/linux/bus/stm32_firewall_device.h

And then these iconic functions, all of them, in order, slay:

• stm32_firewall_get_firewall(9)
• stm32_firewall_grant_access(9)
• stm32_firewall_release_access(9)
• stm32_firewall_grant_access_by_id(9)
• stm32_firewall_release_access_by_id(9)
• stm32_firewall_get_grant_all_access(9)

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🌈 Okay that's the whole page, bestie, you ate that. This little love letter lives in ./include/linux/bus and it's dated October 2026, and the manual it's calling home is struct stm32_firewall(9). Mwah, go forth and firewall responsibly 💖