Date: Tue, 9 Sep 2025 01:52:40 GMT From: Adrian Chadd <adrian@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 9bfb1405332c - main - net80211: add support for drivers to disable sending NULL data frames Message-ID: <202509090152.5891qequ058761@gitrepo.freebsd.org>
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The branch main has been updated by adrian: URL: https://cgit.FreeBSD.org/src/commit/?id=9bfb1405332c6c847dd29e4db4dd3afb56662021 commit 9bfb1405332c6c847dd29e4db4dd3afb56662021 Author: Adrian Chadd <adrian@FreeBSD.org> AuthorDate: 2025-08-27 17:03:22 +0000 Commit: Adrian Chadd <adrian@FreeBSD.org> CommitDate: 2025-09-09 01:48:10 +0000 net80211: add support for drivers to disable sending NULL data frames net80211 has various places where null data / null qos data frames are sent. However plenty of NICs shouldn't be sending them from net80211 and it may even upset their 802.11n window / sequence number tracking. So add support here. Differential Revision: https://reviews.freebsd.org/D52297 Reviewed by: bz --- sys/net80211/ieee80211_output.c | 6 ++++++ sys/net80211/ieee80211_var.h | 3 ++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/sys/net80211/ieee80211_output.c b/sys/net80211/ieee80211_output.c index 57fe687adffe..116fc76a9ce1 100644 --- a/sys/net80211/ieee80211_output.c +++ b/sys/net80211/ieee80211_output.c @@ -1082,6 +1082,12 @@ ieee80211_send_nulldata(struct ieee80211_node *ni) uint8_t *frm; int ret; + /* Don't send NULL frames if we've been configured not to do so. */ + if ((ic->ic_flags_ext & IEEE80211_FEXT_NO_NULLDATA) != 0) { + ieee80211_node_decref(ni); + return (0); + } + if (vap->iv_state == IEEE80211_S_CAC) { IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, ni, "block %s frame in CAC state", "null data"); diff --git a/sys/net80211/ieee80211_var.h b/sys/net80211/ieee80211_var.h index a0293f814899..b9bc2357428d 100644 --- a/sys/net80211/ieee80211_var.h +++ b/sys/net80211/ieee80211_var.h @@ -700,13 +700,14 @@ MALLOC_DECLARE(M_80211_VAP); #define IEEE80211_FEXT_QUIET_IE 0x00800000 /* STATUS: quiet IE in a beacon has been added */ #define IEEE80211_FEXT_UAPSD 0x01000000 /* CONF: enable U-APSD */ #define IEEE80211_FEXT_AMPDU_OFFLOAD 0x02000000 /* CONF: driver/fw handles AMPDU[-TX] itself */ +#define IEEE80211_FEXT_NO_NULLDATA 0x04000000 /* CONF: don't originate NULL data frames from net80211 */ #define IEEE80211_FEXT_BITS \ "\20\2INACT\3SCANWAIT\4BGSCAN\5WPS\6TSN\7SCANREQ\10RESUME" \ "\0114ADDR\12NONEPR_PR\13SWBMISS\14DFS\15DOTD\16STATEWAIT\17REINIT" \ "\20BPF\21WDSLEGACY\22PROBECHAN\23UNIQMAC\24SCAN_OFFLOAD\25SEQNO_OFFLOAD" \ "\26FRAG_OFFLOAD\27VHT" \ - "\30QUIET_IE\31UAPSD\32AMPDU_OFFLOAD" + "\30QUIET_IE\31UAPSD\32AMPDU_OFFLOAD\33NO_NULLDATA" /* ic_flags_ht/iv_flags_ht */ #define IEEE80211_FHT_NONHT_PR 0x00000001 /* STATUS: non-HT sta present */
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