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  • linux-arm
  • linux-coresight-backports
  • Repository
  • linux-coresight-backports
  • net
  • core
  • utils.c
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  • Praveen Chaudhary's avatar
    net: Fix skb->csum update in inet_proto_csum_replace16(). · 189c9b1e
    Praveen Chaudhary authored Jan 23, 2020
    
    
    skb->csum is updated incorrectly, when manipulation for
    NF_NAT_MANIP_SRC\DST is done on IPV6 packet.
    
    Fix:
    There is no need to update skb->csum in inet_proto_csum_replace16(),
    because update in two fields a.) IPv6 src/dst address and b.) L4 header
    checksum cancels each other for skb->csum calculation. Whereas
    inet_proto_csum_replace4 function needs to update skb->csum, because
    update in 3 fields a.) IPv4 src/dst address, b.) IPv4 Header checksum
    and c.) L4 header checksum results in same diff as L4 Header checksum
    for skb->csum calculation.
    
    [ pablo@netfilter.org: a few comestic documentation edits ]
    Signed-off-by: default avatarPraveen Chaudhary <pchaudhary@linkedin.com>
    Signed-off-by: default avatarZhenggen Xu <zxu@linkedin.com>
    Signed-off-by: default avatarAndy Stracner <astracner@linkedin.com>
    Reviewed-by: default avatarFlorian Westphal <fw@strlen.de>
    Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
    189c9b1e