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ieee80211: Fix the handling of padding in Trigger frames and the FCS. 

Change-Id: I6af9d04bcaafabf57c485c76da5d4e87fe5eb0e9
This commit is contained in:
Richard Sharpe 2021-05-25 14:31:34 -07:00
parent 8cc61aa8cd
commit 11cd298ae8
1 changed files with 32 additions and 5 deletions
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37
epan/dissectors/packet-ieee80211.c
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@ -3758,6 +3758,8 @@ static int hf_ieee80211_he_trigger_doppler = -1;
static int hf_ieee80211_he_trigger_ul_he_sig_a_reserved = -1;
static int hf_ieee80211_he_trigger_reserved = -1;
static int hf_ieee80211_he_trigger_user_info = -1;
static int hf_ieee80211_he_trigger_user_info_padding_start = -1;
static int hf_ieee80211_he_trigger_padding = -1;
static int hf_ieee80211_he_trigger_bar_ctrl = -1;
static int hf_ieee80211_he_trigger_bar_ctrl_ba_ack_policy = -1;
static int hf_ieee80211_he_trigger_bar_ctrl_ba_type = -1;
@ -31057,7 +31059,8 @@ static int * const user_info_headers_no_2045[] = {
static int
add_he_trigger_user_info(proto_tree *tree, tvbuff_t *tvb, int offset,
packet_info *pinfo, guint8 trigger_type, guint8 subtype, int *frame_len)
packet_info *pinfo, guint8 trigger_type, guint8 subtype, int *frame_len,
guint fcs_len)
{
proto_item *pi = NULL;
proto_tree *user_info = NULL;
@ -31136,8 +31139,24 @@ add_he_trigger_user_info(proto_tree *tree, tvbuff_t *tvb, int offset,
aid12_subfield = tvb_get_letohs(tvb, offset);
}
if (aid12_subfield == 4095) {
/* Show the Start of Padding field. */
proto_tree_add_item(user_info,
hf_ieee80211_he_trigger_user_info_padding_start,
tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
}
proto_item_set_len(pi, offset - start_offset);
/* Now, treat all the rest of the frame as padding */
if (aid12_subfield == 4095) {
proto_tree_add_item(tree, hf_ieee80211_he_trigger_padding, tvb, offset,
tvb_reported_length_remaining(tvb, offset) - fcs_len,
ENC_NA);
}
*frame_len += length;
return length;
}
@ -31168,7 +31187,7 @@ static int * const ranging_headers2[] = {
static int
dissect_ieee80211_he_trigger(tvbuff_t *tvb, packet_info *pinfo _U_,
proto_tree *tree, int offset)
proto_tree *tree, int offset, guint fcs_len)
{
const gchar *ether_name = tvb_get_ether_name(tvb, offset);
proto_item *hidden_item;
@ -31234,7 +31253,7 @@ dissect_ieee80211_he_trigger(tvbuff_t *tvb, packet_info *pinfo _U_,
}
add_he_trigger_user_info(tree, tvb, offset, pinfo, trigger_type, subtype,
&length);
&length, fcs_len);
/*
* Padding should commence here ... TODO, deal with it.
@ -32827,9 +32846,9 @@ dissect_ieee80211_common(tvbuff_t *tvb, packet_info *pinfo,
/*
* The len returned will be adjusted to include any padding required
*/
hdr_len = dissect_ieee80211_he_trigger(tvb, pinfo, hdr_tree, offset);
hdr_len = dissect_ieee80211_he_trigger(tvb, pinfo, hdr_tree, offset,
phdr->fcs_len);
ohdr_len = hdr_len;
has_fcs = FALSE; /* Not sure at this stage */
break;
case CTRL_TACK:
@ -47021,6 +47040,14 @@ proto_register_ieee80211(void)
{"User Info", "wlan.trigger.he.user_info",
FT_UINT40, BASE_HEX, NULL, 0, NULL, HFILL }},
{&hf_ieee80211_he_trigger_user_info_padding_start,
{"Start of Padding", "wlan.trigger.he.user_info.start_of_padding",
FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
{&hf_ieee80211_he_trigger_padding,
{"Padding", "wlan.trigger.he.padding",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
{&hf_ieee80211_he_trigger_mpdu_mu_spacing,
{"MPDU MU Spacing Factor", "wlan.trigger.he.mpdu_mu_spacing_factor",
FT_UINT8, BASE_DEC, NULL, 0x03, NULL, HFILL }},