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iwlwifi: pcie: don't consider IV len in A-MSDU 

From gen2 PN is totally offloaded to hardware (also the space for the
IV isn't part of the skb).  As you can see in mvm/mac80211.c:3545, the
MAC for cipher types CCMP/GCMP doesn't set
IEEE80211_KEY_FLAG_PUT_IV_SPACE for gen2 NICs.

This causes all the AMSDU data to be corrupted with cipher enabled.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Mordechay Goodstein 2019-11-07 13:51:47 +02:00 committed by Kalle Valo
parent 3d206e6899
commit cb1a4badf5
1 changed files with 7 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
View File

@ -251,27 +251,23 @@ static int iwl_pcie_gen2_build_amsdu(struct iwl_trans *trans,
struct ieee80211_hdr *hdr = (void *)skb->data;
unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room;
unsigned int mss = skb_shinfo(skb)->gso_size;
u16 length, iv_len, amsdu_pad;
u16 length, amsdu_pad;
u8 *start_hdr;
struct iwl_tso_hdr_page *hdr_page;
struct page **page_ptr;
struct tso_t tso;
/* if the packet is protected, then it must be CCMP or GCMP */
iv_len = ieee80211_has_protected(hdr->frame_control) ?
IEEE80211_CCMP_HDR_LEN : 0;
trace_iwlwifi_dev_tx(trans->dev, skb, tfd, sizeof(*tfd),
&dev_cmd->hdr, start_len, 0);
ip_hdrlen = skb_transport_header(skb) - skb_network_header(skb);
snap_ip_tcp_hdrlen = 8 + ip_hdrlen + tcp_hdrlen(skb);
total_len = skb->len - snap_ip_tcp_hdrlen - hdr_len - iv_len;
total_len = skb->len - snap_ip_tcp_hdrlen - hdr_len;
amsdu_pad = 0;
/* total amount of header we may need for this A-MSDU */
hdr_room = DIV_ROUND_UP(total_len, mss) *
(3 + snap_ip_tcp_hdrlen + sizeof(struct ethhdr)) + iv_len;
(3 + snap_ip_tcp_hdrlen + sizeof(struct ethhdr));
/* Our device supports 9 segments at most, it will fit in 1 page */
hdr_page = get_page_hdr(trans, hdr_room);
@ -282,14 +278,12 @@ static int iwl_pcie_gen2_build_amsdu(struct iwl_trans *trans,
start_hdr = hdr_page->pos;
page_ptr = (void *)((u8 *)skb->cb + trans_pcie->page_offs);
*page_ptr = hdr_page->page;
memcpy(hdr_page->pos, skb->data + hdr_len, iv_len);
hdr_page->pos += iv_len;
/*
* Pull the ieee80211 header + IV to be able to use TSO core,
* Pull the ieee80211 header to be able to use TSO core,
* we will restore it for the tx_status flow.
*/
skb_pull(skb, hdr_len + iv_len);
skb_pull(skb, hdr_len);
/*
* Remove the length of all the headers that we don't actually
@ -364,8 +358,8 @@ static int iwl_pcie_gen2_build_amsdu(struct iwl_trans *trans,
}
}
/* re -add the WiFi header and IV */
skb_push(skb, hdr_len + iv_len);
/* re -add the WiFi header */
skb_push(skb, hdr_len);
return 0;