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| author | Patrick McHardy <kaber@trash.net> | 2012-08-26 19:14:10 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-08-30 03:00:16 +0200 |
| commit | 2cf545e835aae92173ef0b1f4af385e9c40f21e8 (patch) | |
| tree | b03bf5a155eed859a9852922a4311340a598c725 /net/core/utils.c | |
| parent | 0ad352cb433ed2b05921a32b5ee20410512e2320 (diff) | |
| download | linux-3.10-2cf545e835aae92173ef0b1f4af385e9c40f21e8.tar.gz linux-3.10-2cf545e835aae92173ef0b1f4af385e9c40f21e8.tar.bz2 linux-3.10-2cf545e835aae92173ef0b1f4af385e9c40f21e8.zip | |
net: core: add function for incremental IPv6 pseudo header checksum updates
Add inet_proto_csum_replace16 for incrementally updating IPv6 pseudo header
checksums for IPv6 NAT.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/utils.c')
| -rw-r--r-- | net/core/utils.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/net/core/utils.c b/net/core/utils.c index 39895a65e54..f5613d569c2 100644 --- a/net/core/utils.c +++ b/net/core/utils.c @@ -294,6 +294,26 @@ void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, } EXPORT_SYMBOL(inet_proto_csum_replace4); +void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb, + const __be32 *from, const __be32 *to, + int pseudohdr) +{ + __be32 diff[] = { + ~from[0], ~from[1], ~from[2], ~from[3], + to[0], to[1], to[2], to[3], + }; + if (skb->ip_summed != CHECKSUM_PARTIAL) { + *sum = csum_fold(csum_partial(diff, sizeof(diff), + ~csum_unfold(*sum))); + if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr) + skb->csum = ~csum_partial(diff, sizeof(diff), + ~skb->csum); + } else if (pseudohdr) + *sum = ~csum_fold(csum_partial(diff, sizeof(diff), + csum_unfold(*sum))); +} +EXPORT_SYMBOL(inet_proto_csum_replace16); + int mac_pton(const char *s, u8 *mac) { int i; |