From: Yossi Kuperman <yoss...@mellanox.com>
Both ip6_input_finish (non-GRO) and esp6_gro_receive (GRO) strip
the IPv6 header without adjusting skb->csum accordingly. As a
result CHECKSUM_COMPLETE breaks and "hw csum failure" is written
to the kernel log by netdev_rx_csum_fault (dev.c).
Fix skb->csum by substracting the checksum value of the pulled IPv6
header using a call to skb_postpull_rcsum.
This affects both transport and tunnel modes.
Note that the fix occurs far from the place that the header was
pulled. This is based on existing code, see:
ipv6_srh_rcv() in exthdrs.c and rawv6_rcv() in raw.c
Signed-off-by: Yossi Kuperman <yoss...@mellanox.com>
Signed-off-by: Ilan Tayari <il...@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
net/ipv6/esp6.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 0ca1db6..74bde20 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -495,6 +495,8 @@ int esp6_input_done2(struct sk_buff *skb, int err)
trimlen = alen + padlen + 2;
if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ skb_network_header_len(skb));
csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
skb->csum = csum_block_sub(skb->csum, csumdiff,
skb->len - trimlen);
--
2.7.4
