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authorJohannes Berg <johannes.berg@intel.com>2022-02-02 10:49:36 +0200
committerJohannes Berg <johannes.berg@intel.com>2022-02-04 16:23:19 +0100
commit667aa7426454154ec1e0922f92625bb33ae9951f (patch)
tree68356ae71ecf9a9e0c5d77df179b160d27c11f1b /net/wireless
parentf39b7d62a19edd1fa391e9243bdc13cefca08b50 (diff)
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cfg80211/mac80211: assume CHECKSUM_COMPLETE includes SNAP
There's currently only one driver that reports CHECKSUM_COMPLETE, that is iwlwifi. The current hardware there calculates checksum after the SNAP header, but only RFC 1042 (and some other cases, but replicating the exact hardware logic for corner cases in the driver seemed awkward.) Newer generations of hardware will checksum _including_ the SNAP, which makes things easier. To handle that, simply always assume the checksum _includes_ the SNAP header, which this patch does, requiring to first add it for older iwlwifi hardware, and then remove it again later on conversion. Alternatively, we could have: 1) Always assumed the checksum starts _after_ the SNAP header; the problem with this is that we'd have to replace the exact "what is the SNAP" check in iwlwifi that cfg80211 has. 2) Made it configurable with some flag, but that seemed like too much complexity. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Link: https://lore.kernel.org/r/iwlwifi.20220202104617.230736e19e0e.I3e6745873585ad943c152fab9e23b5221f17a95f@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/util.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 41ea65deb6e1..e02f1702806e 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -5,7 +5,7 @@
* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright 2017 Intel Deutschland GmbH
- * Copyright (C) 2018-2020 Intel Corporation
+ * Copyright (C) 2018-2021 Intel Corporation
*/
#include <linux/export.h>
#include <linux/bitops.h>
@@ -634,12 +634,14 @@ int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
tmp.h_proto != htons(ETH_P_AARP) &&
tmp.h_proto != htons(ETH_P_IPX)) ||
- ether_addr_equal(payload.hdr, bridge_tunnel_header)))
+ ether_addr_equal(payload.hdr, bridge_tunnel_header))) {
/* remove RFC1042 or Bridge-Tunnel encapsulation and
* replace EtherType */
hdrlen += ETH_ALEN + 2;
- else
+ skb_postpull_rcsum(skb, &payload, ETH_ALEN + 2);
+ } else {
tmp.h_proto = htons(skb->len - hdrlen);
+ }
pskb_pull(skb, hdrlen);