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authorDaniel Borkmann <daniel@iogearbox.net>2016-03-04 17:15:02 +0300
committerDavid S. Miller <davem@davemloft.net>2016-03-08 21:55:15 +0300
commit8050c0f0274a15841756968857cfb07b3ab809ae (patch)
tree2fd53b4ddbff894e5bb3db8ce8e3f952b79cc77d /include/net
parent810813c47a564416f6306ae214e2661366c987a7 (diff)
downloadlinux-8050c0f0274a15841756968857cfb07b3ab809ae.tar.xz
bpf: allow bpf_csum_diff to feed bpf_l3_csum_replace as well
Commit 7d672345ed29 ("bpf: add generic bpf_csum_diff helper") added a generic checksum diff helper that can feed bpf_l4_csum_replace() with a target __wsum diff that is to be applied to the L4 checksum. This facility is very flexible, can be cascaded, allows for adding, removing, or diffing data, or for calculating the pseudo header checksum from scratch, but it can also be reused for working with the IPv4 header checksum. Thus, analogous to bpf_l4_csum_replace(), add a case for header field value of 0 to change the checksum at a given offset through a new helper csum_replace_by_diff(). Also, in addition to that, this provides an easy to use interface for feeding precalculated diffs f.e. coming from a map. It nicely complements bpf_l3_csum_replace() that currently allows only for csum updates of 2 and 4 byte diffs. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/checksum.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 10a16b5bd1c7..abffc64e7300 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -120,6 +120,11 @@ static inline __wsum csum_partial_ext(const void *buff, int len, __wsum sum)
#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
+static inline void csum_replace_by_diff(__sum16 *sum, __wsum diff)
+{
+ *sum = csum_fold(csum_add(diff, ~csum_unfold(*sum)));
+}
+
static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
{
__wsum tmp = csum_sub(~csum_unfold(*sum), (__force __wsum)from);