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selftests/bpf: document pseudo-header checksum helpers

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network_helpers.h provides helpers to compute checksum for pseudo
headers but no helpers to compute the global checksums.

Before adding those, clarify csum_tcpudp_magic and csum_ipv6_magic
purpose by adding some documentation.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://lore.kernel.org/r/20241120-flow_dissector-v3-10-45b46494f937@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2024-11-20 08:43:20 +01:00
committed by Alexei Starovoitov
parent f4504af685
commit 752fddc050
1 changed files with 30 additions and 0 deletions
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30
tools/testing/selftests/bpf/network_helpers.h
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@@ -129,6 +129,21 @@ static inline __sum16 build_ip_csum(struct iphdr *iph)
return csum_fold(sum);
}
/**
* csum_tcpudp_magic - compute IP pseudo-header checksum
*
* Compute the IPv4 pseudo header checksum. The helper can take a
* accumulated sum from the transport layer to accumulate it and directly
* return the transport layer
*
* @saddr: IP source address
* @daddr: IP dest address
* @len: IP data size
* @proto: transport layer protocol
* @csum: The accumulated partial sum to add to the computation
*
* Returns the folded sum
*/
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto,
__wsum csum)
@@ -144,6 +159,21 @@ static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
return csum_fold((__u32)s);
}
/**
* csum_ipv6_magic - compute IPv6 pseudo-header checksum
*
* Compute the ipv6 pseudo header checksum. The helper can take a
* accumulated sum from the transport layer to accumulate it and directly
* return the transport layer
*
* @saddr: IPv6 source address
* @daddr: IPv6 dest address
* @len: IPv6 data size
* @proto: transport layer protocol
* @csum: The accumulated partial sum to add to the computation
*
* Returns the folded sum
*/
static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, __u8 proto,