[PATCH net-next 7/8] net: Add calaulation of non folded IPV6 pseudo header checksum
From: Or Gerlitz <hidden>
Date: 2014-10-30 16:07:06
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
From: Shani Michaeli <redacted> Compute IPV6 pseudo header checksum without folding it to a 16 bit return value. Signed-off-by: Shani Michaeli <redacted> Signed-off-by: Matan Barak <redacted> --- include/net/ip6_checksum.h | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h
index 1a49b73..c45d690 100644
--- a/include/net/ip6_checksum.h
+++ b/include/net/ip6_checksum.h@@ -41,6 +41,27 @@ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, __wsum csum); #endif +static inline __wsum csum_ipv6_magic_nofold(const struct in6_addr *saddr, + const struct in6_addr *daddr, + __u32 len, unsigned short proto, + __wsum sum) +{ + __wsum res = sum; + + res = csum_add(res, (__force __wsum)saddr->in6_u.u6_addr32[0]); + res = csum_add(res, (__force __wsum)saddr->in6_u.u6_addr32[1]); + res = csum_add(res, (__force __wsum)saddr->in6_u.u6_addr32[2]); + res = csum_add(res, (__force __wsum)saddr->in6_u.u6_addr32[3]); + res = csum_add(res, (__force __wsum)daddr->in6_u.u6_addr32[0]); + res = csum_add(res, (__force __wsum)daddr->in6_u.u6_addr32[1]); + res = csum_add(res, (__force __wsum)daddr->in6_u.u6_addr32[2]); + res = csum_add(res, (__force __wsum)daddr->in6_u.u6_addr32[3]); + res = csum_add(res, (__force __wsum)htonl(len)); + res = csum_add(res, (__force __wsum)htonl(proto)); + + return res; +} + static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto) { return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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1.7.1