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Do not check sequence number for QoS Null frames; set it for generated QoS Null

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frames to 0

From IEEE Std. 802.11-2012, 8.3.2.1 "Data frame format", p. 415 (513):
"The Sequence Control field for QoS (+)Null frames is ignored by the receiver
upon reception."

At this moment, any <mode>_input() function interprets them as regular QoS data
frames with TID = 0. As a result, stations, that use another TX sequence for
QoS Null frames (e.g. wpi(4), where (QoS) Null frames are generated by the
firmware), may experience significant packet loss with any other NIC in hostap
mode.

Tested:

* wpi(4) (author)
* iwn(4) - Intel 5100, STA mode (me)

PR:		kern/200128
Submitted by:	Andriy Voskoboinyk <s3erios@gmail.com>
This commit is contained in:
Adrian Chadd 2015-05-12 16:55:50 +00:00
parent d27c74649b
commit c3ebe01919
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=282820
7 changed files with 24 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
sys/net80211/ieee80211.h
View File

@ -169,6 +169,11 @@ struct ieee80211_qosframe_addr4 {
#define IEEE80211_FC1_PROTECTED 0x40
#define IEEE80211_FC1_ORDER 0x80
#define IEEE80211_HAS_SEQ(type, subtype) \
((type) != IEEE80211_FC0_TYPE_CTL && \
!((type) == IEEE80211_FC0_TYPE_DATA && \
((subtype) & IEEE80211_FC0_SUBTYPE_QOS_NULL) == \
IEEE80211_FC0_SUBTYPE_QOS_NULL))
#define IEEE80211_SEQ_FRAG_MASK 0x000f
#define IEEE80211_SEQ_FRAG_SHIFT 0
#define IEEE80211_SEQ_SEQ_MASK 0xfff0

4
sys/net80211/ieee80211_adhoc.c
View File

@ -291,7 +291,6 @@ doprint(struct ieee80211vap *vap, int subtype)
static int
adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
{
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = vap->iv_ifp;
@ -414,7 +413,8 @@ adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
}
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if (HAS_SEQ(type) && IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
if (IEEE80211_HAS_SEQ(type, subtype) &&
IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
uint8_t tid = ieee80211_gettid(wh);
if (IEEE80211_QOS_HAS_SEQ(wh) &&
TID_TO_WME_AC(tid) >= WME_AC_VI)

3
sys/net80211/ieee80211_hostap.c
View File

@ -478,7 +478,6 @@ doprint(struct ieee80211vap *vap, int subtype)
static int
hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
{
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = vap->iv_ifp;
@ -571,7 +570,7 @@ hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if (HAS_SEQ(type)) {
if (IEEE80211_HAS_SEQ(type, subtype)) {
uint8_t tid = ieee80211_gettid(wh);
if (IEEE80211_QOS_HAS_SEQ(wh) &&
TID_TO_WME_AC(tid) >= WME_AC_VI)

12
sys/net80211/ieee80211_input.h
View File

@ -168,19 +168,22 @@ ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh)
{
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define SEQ_EQ(a,b) ((int)((a)-(b)) == 0)
#define HAS_SEQ(type) ((type & 0x4) == 0)
#define SEQNO(a) ((a) >> IEEE80211_SEQ_SEQ_SHIFT)
#define FRAGNO(a) ((a) & IEEE80211_SEQ_FRAG_MASK)
uint16_t rxseq;
uint8_t type;
uint8_t type, subtype;
uint8_t tid;
struct ieee80211_rx_ampdu *rap;
rxseq = le16toh(*(uint16_t *)wh->i_seq);
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
/* Types with no sequence number are always treated valid */
if (! HAS_SEQ(type))
/*
* Types with no sequence number (or QoS (+)Null frames)
* are always treated valid.
*/
if (! IEEE80211_HAS_SEQ(type, subtype))
return 1;
tid = ieee80211_gettid(wh);
@ -235,7 +238,6 @@ ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh)
return 1;
#undef SEQ_LEQ
#undef SEQ_EQ
#undef HAS_SEQ
#undef SEQNO
#undef FRAGNO
}

7
sys/net80211/ieee80211_output.c
View File

@ -730,7 +730,12 @@ ieee80211_send_setup(
if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap))
m->m_flags |= M_AMPDU_MPDU;
else {
seqno = ni->ni_txseqs[tid]++;
if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK,
type & IEEE80211_FC0_SUBTYPE_MASK))
seqno = ni->ni_txseqs[tid]++;
else
seqno = 0;
*(uint16_t *)&wh->i_seq[0] =
htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
M_SEQNO_SET(m, seqno);

4
sys/net80211/ieee80211_sta.c
View File

@ -527,7 +527,6 @@ doprint(struct ieee80211vap *vap, int subtype)
static int
sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
{
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = vap->iv_ifp;
@ -623,7 +622,8 @@ sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
if ( IEEE80211_HAS_SEQ(type, subtype) &&
!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
uint8_t tid = ieee80211_gettid(wh);
if (IEEE80211_QOS_HAS_SEQ(wh) &&
TID_TO_WME_AC(tid) >= WME_AC_VI)

3
sys/net80211/ieee80211_wds.c
View File

@ -406,7 +406,6 @@ wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
static int
wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
{
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = vap->iv_ifp;
@ -488,7 +487,7 @@ wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
}
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if (HAS_SEQ(type)) {
if (IEEE80211_HAS_SEQ(type, subtype)) {
uint8_t tid = ieee80211_gettid(wh);
if (IEEE80211_QOS_HAS_SEQ(wh) &&
TID_TO_WME_AC(tid) >= WME_AC_VI)