dev_set_promiscuity(9)

🦋 dev_set_promiscuity 🦋

okay bestie, welcome to the dev_set_promiscuity(9) page from the Kernel API Manual 💖 this one is literally about updating the promiscuity count on a device, and it’s giving very specific little gremlin energy in the best way.

---

✨ NAME ✨

dev_set_promiscuity — update promiscuity count on a device 💅

---

🎀 SYNOPSIS 🎀

int dev_set_promiscuity (struct net_device *dev , int inc );

---

🌸 ARGUMENTS 🌸

• dev — the device, aka the struct net_device * we’re messing with 🫶
• inc — the modifier, aka the little number that nudges the promiscuity count up or down ✨

---

💅 DESCRIPTION 💅

okay so this function adds or removes promiscuity from a device. the way it works is: while the count in the device remains above zero, the interface remains promiscuous. once it hits zero, the device reverts back to normal filtering operation. periodt 💀

a negative inc value is used to drop promiscuity on the device. and it returns 0 if successful or a negative errno code on error. no cap, that’s the whole vibe check 🔥

---

🦋 SEE ALSO 🦋

the kernel file to peek at is ./net/core/dev_api.c, and the whole friend group is:

• dev_change_name(9)
• dev_set_alias(9)
• dev_change_flags(9)
• dev_set_group(9)
• dev_change_net_namespace(9)
• dev_change_carrier(9)
• dev_change_tx_queue_len(9)
• dev_change_proto_down(9)
• dev_open(9)
• dev_close(9)
• dev_disable_lro(9)
• dev_set_allmulti(9)
• dev_set_mac_address(9)
• netdev_state_change(9)

---

source/version: ./net/core • date: October 2026 • manual: dev_set_promiscuity(9) — xoxo, your kernel bestie 💖🎀