From 667aa7426454154ec1e0922f92625bb33ae9951f Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 2 Feb 2022 10:49:36 +0200
Subject: [PATCH] cfg80211/mac80211: assume CHECKSUM_COMPLETE includes SNAP
Git-commit: 667aa7426454154ec1e0922f92625bb33ae9951f
Patch-mainline: v5.18-rc1
References: bsc#1202131
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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 3 +++
net/mac80211/rx.c | 2 ++
net/wireless/util.c | 8 +++++---
3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 295629c5c035..5f3128fc1066 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -209,6 +209,9 @@ static int iwl_mvm_create_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
shdr->type != htons(ETH_P_PAE) &&
shdr->type != htons(ETH_P_TDLS))))
skb->ip_summed = CHECKSUM_NONE;
+ else
+ /* mac80211 assumes full CSUM including SNAP header */
+ skb_postpush_rcsum(skb, shdr, sizeof(*shdr));
}
fraglen = len - headlen;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 93680af62c47..d54a4d98c648 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4629,6 +4629,8 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
/* do the header conversion - first grab the addresses */
ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
+ skb_postpull_rcsum(skb, skb->data + snap_offs,
+ sizeof(rfc1042_header) + 2);
/* remove the SNAP but leave the ethertype */
skb_pull(skb, snap_offs + sizeof(rfc1042_header));
/* push the addresses in front */
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);
--
2.35.3