net: Add inet_proto_csum_replace_by_diff utility function
This function updates a checksum field value and skb->csum based on a value which is the difference between the old and new checksum. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -144,6 +144,8 @@ void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
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void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
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void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
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const __be32 *from, const __be32 *to,
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const __be32 *from, const __be32 *to,
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bool pseudohdr);
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bool pseudohdr);
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void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
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__wsum diff, bool pseudohdr);
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static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
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static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
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__be16 from, __be16 to,
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__be16 from, __be16 to,
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@ -336,6 +336,19 @@ void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
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}
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}
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EXPORT_SYMBOL(inet_proto_csum_replace16);
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EXPORT_SYMBOL(inet_proto_csum_replace16);
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void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb,
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__wsum diff, bool pseudohdr)
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{
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if (skb->ip_summed != CHECKSUM_PARTIAL) {
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*sum = csum_fold(csum_add(diff, ~csum_unfold(*sum)));
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if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
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skb->csum = ~csum_add(diff, ~skb->csum);
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} else if (pseudohdr) {
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*sum = ~csum_fold(csum_add(diff, csum_unfold(*sum)));
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}
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}
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EXPORT_SYMBOL(inet_proto_csum_replace_by_diff);
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struct __net_random_once_work {
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struct __net_random_once_work {
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struct work_struct work;
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struct work_struct work;
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struct static_key *key;
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struct static_key *key;
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