ieee80211_is_data_present(9)

💖 ieee80211_is_data_present(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — yes, that's the manual name, we're doing this, and today's main character is ieee80211_is_data_present. it's a whole vibe check for frame control bytes, no cap 🦋

---

✨ NAME ✨

ieee80211_is_data_present — check if type is IEEE80211_FTYPE_DATA and has data 💅

like, is this thing a data-type frame and does it actually carry data? two questions, one function, iconic behavior fr fr.

---

🌸 SYNOPSIS 🌸

bool ieee80211_is_data_present (__le16 fc );

she takes one little argument and gives you back a bool. simple. elegant. slay 🎀

---

🧚 ARGUMENTS 🧚

• fc — frame control bytes in little-endian byteorder 🫶

that's it, that's the whole input. just the raw frame control bytes, little-endian style. respect the byteorder or she will not respect you back 💀

---

👑 RETURN 👑

returns whether or not the frame is a QoS data frame that has data (i.e. is not null data) ⭐

so like — QoS data frame with actual data inside? yes bestie, true. null data? nope, false, that's giving "empty calories" energy 🙈

---

🌈 SEE ALSO 🌈

the kernel file ./include/linux/ieee80211.h and honestly the entire friend group:

• ieee80211_has_tods(9)
• ieee80211_has_fromds(9)
• ieee80211_has_a4(9)
• ieee80211_has_morefrags(9)
• ieee80211_has_retry(9)
• ieee80211_has_pm(9)
• ieee80211_has_moredata(9)
• ieee80211_has_protected(9)
• ieee80211_has_order(9)
• ieee80211_is_mgmt(9)
• ieee80211_is_ctl(9)
• ieee80211_is_data(9)
• ieee80211_is_ext(9)
• ieee80211_is_data_qos(9)
• ieee80211_is_assoc_req(9)
• ieee80211_is_assoc_resp(9)
• ieee80211_is_reassoc_req(9)
• ieee80211_is_reassoc_resp(9)
• ieee80211_is_assoc(9)
• ieee80211_is_probe_req(9)
• ieee80211_is_probe_resp(9)
• ieee80211_is_beacon(9)
• ieee80211_is_atim(9)
• ieee80211_is_disassoc(9)
• ieee80211_is_auth(9)
• ieee80211_is_deauth(9)
• ieee80211_is_action(9)
• ieee80211_is_back_req(9)
• ieee80211_is_back(9)
• ieee80211_is_pspoll(9)
• ieee80211_is_rts(9)
• ieee80211_is_cts(9)
• ieee80211_is_ack(9)
• ieee80211_is_cfend(9)
• ieee80211_is_cfendack(9)
• ieee80211_is_nullfunc(9)
• ieee80211_is_qos_nullfunc(9)
• ieee80211_is_trigger(9)
• ieee80211_is_any_nullfunc(9)
• ieee80211_is_first_frag(9)
• ieee80211_is_frag(9)
• struct ieee80211_quiet_ie(9)
• struct ieee80211_msrment_ie(9)
• struct ieee80211_channel_sw_ie(9)
• struct ieee80211_ext_chansw_ie(9)
• struct ieee80211_sec_chan_offs_ie(9)
• struct ieee80211_wide_bw_chansw_ie(9)
• struct ieee80211_tim_ie(9)
• struct ieee80211_tpc_report_ie(9)
• struct ieee80211_bss_load_elem(9)
• struct ieee80211_timeout_interval_ie(9)
• enum ieee80211_idle_options(9)
• struct ieee80211_bss_max_idle_period_ie(9)
• struct ieee80211_bssid_index(9)
• struct ieee80211_multiple_bssid_configuration(9)
• ieee80211_get_qos_ctl(9)
• ieee80211_get_tid(9)
• ieee80211_get_SA(9)
• ieee80211_get_DA(9)
• ieee80211_is_bufferable_mmpdu(9)
• _ieee80211_is_robust_mgmt_frame(9)
• ieee80211_is_robust_mgmt_frame(9)
• ieee80211_is_public_action(9)
• ieee80211_is_protected_dual_of_public_action(9)
• _ieee80211_is_group_privacy_action(9)
• ieee80211_is_group_privacy_action(9)
• ieee80211_tu_to_usec(9)
• ieee80211_get_tdls_action(9)
• ieee80211_action_contains_tpc(9)
• ieee80211_is_timing_measurement(9)
• ieee80211_is_ftm(9)
• for_each_element_completed(9)
• struct ieee80211_enh_crit_upd(9)
• ieee80211_check_tim(9)

like I said. the whole group chat. go say hi to all of them 💜

---

okay that's the page!! mwah 💋 this came from ./include/linux, dated October 2026 — so yeah, future girlies are still out here checking frame control bytes, and honestly? we love that for us. stay little-endian, bestie, and go read some kernel headers 🌟💖🎀