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net: Save software checksum complete

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In skb_checksum complete, if we need to compute the checksum for the
packet (via skb_checksum) save the result as CHECKSUM_COMPLETE.
Subsequent checksum verification can use this.

Also, added csum_complete_sw flag to distinguish between software and
hardware generated checksum complete, we should always be able to trust
the software computation.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2014-06-10 18:54:19 -07:00
committed by David S. Miller
parent 5d0c2b95bc
commit 7e3cead517
4 changed files with 17 additions and 9 deletions
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3
include/linux/skbuff.h
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@@ -573,7 +573,8 @@ struct sk_buff {
__u8 encapsulation:1;
__u8 encap_hdr_csum:1;
__u8 csum_valid:1;
/* 4/6 bit hole (depending on ndisc_nodetype presence) */
__u8 csum_complete_sw:1;
/* 3/5 bit hole (depending on ndisc_nodetype presence) */
kmemcheck_bitfield_end(flags2);
#if defined CONFIG_NET_DMA || defined CONFIG_NET_RX_BUSY_POLL