diff options
| author | David S. Miller | 2016-03-13 23:55:14 -0400 |
|---|---|---|
| committer | David S. Miller | 2016-03-13 23:55:14 -0400 |
| commit | 20db778e51d569e8260c40e06473a639d6d01393 (patch) | |
| tree | 6cb060f2472662019329028c10af017473a5549e /include | |
| parent | fbd40ea0180a2d328c5adc61414dc8bab9335ce2 (diff) | |
| parent | 08334824951dd6d1295860da07b1236d18b0b8df (diff) | |
Merge branch 'ipv4-ipv6-csums'
Alexander Duyck says:
====================
Fix differences between IPv4 and IPv6 TCP/UDP checksum calculation
This patch series is meant to address the differences that exist between
IPv4 and IPv6 in terms of checksum calculation. Specifically the IPv6
function csum_ipv6_magic treated length as a value that could be greater
than 64K, while csum_tcpudp_magic was truncating the length at 16 bits.
After looking over the code and giving it some thought I decided it would
be best to update the IPv4 function so that it worked the same way the IPv6
one did. This allows us to get the same results given the same inputs for
both functions. As a result we can use the same processes to reverse the
calculation in the event we need to do something like remove the length of
the pseudo-header checksum.
I also took the opportunity to standardize things so that the parameters
for these functions all use the correct types. IPv4 addresses are __be32,
length should always be __u32, and protocol is a __u8.
With this change in place it corrects an issue with UDP tunnels in which we
were getting a checksum that was off by 1 when performing fragmentation on
inner UDP packets.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/checksum.h | 8 | ||||
| -rw-r--r-- | include/net/ip6_checksum.h | 3 |
2 files changed, 5 insertions, 6 deletions
diff --git a/include/asm-generic/checksum.h b/include/asm-generic/checksum.h index 59811df58c5b..3150cbd8eb21 100644 --- a/include/asm-generic/checksum.h +++ b/include/asm-generic/checksum.h @@ -65,14 +65,14 @@ static inline __sum16 csum_fold(__wsum csum) * returns a 16-bit checksum, already complemented */ extern __wsum -csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, - unsigned short proto, __wsum sum); +csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, + __u8 proto, __wsum sum); #endif #ifndef csum_tcpudp_magic static inline __sum16 -csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, - unsigned short proto, __wsum sum) +csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, + __u8 proto, __wsum sum) { return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); } diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h index 1a49b73f7f6e..cca840584c88 100644 --- a/include/net/ip6_checksum.h +++ b/include/net/ip6_checksum.h @@ -37,8 +37,7 @@ #ifndef _HAVE_ARCH_IPV6_CSUM __sum16 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, - __u32 len, unsigned short proto, - __wsum csum); + __u32 len, __u8 proto, __wsum csum); #endif static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto) |