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selftests/bpf: add network helpers to generate udp checksums

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network_helpers.c provides some helpers to generate ip checksums or ip
pseudo-header checksums, but not for upper layers (eg: udp checksums)

Add helpers for udp checksum to allow manually building udp packets.

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-v3-12-45b46494f937@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2024-11-20 08:43:22 +01:00
committed by Alexei Starovoitov
parent a2f482c34a
commit bcc00987bc
1 changed files with 42 additions and 0 deletions
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42
tools/testing/selftests/bpf/network_helpers.h
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@@ -14,6 +14,7 @@ typedef __u16 __sum16;
#include <linux/sockios.h>
#include <linux/err.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <bpf/bpf_endian.h>
#include <net/if.h>
@@ -193,6 +194,47 @@ static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
return csum_fold((__u32)s);
}
/**
* build_udp_v4_csum - compute UDP checksum for UDP over IPv4
*
* Compute the checksum to embed in UDP header, composed of the sum of IP
* pseudo-header checksum, UDP header checksum and UDP data checksum
* @iph IP header
* @udph UDP header, which must be immediately followed by UDP data
*
* Returns the total checksum
*/
static inline __sum16 build_udp_v4_csum(const struct iphdr *iph,
const struct udphdr *udph)
{
unsigned long sum;
sum = csum_partial(udph, ntohs(udph->len), 0);
return csum_tcpudp_magic(iph->saddr, iph->daddr, ntohs(udph->len),
IPPROTO_UDP, sum);
}
/**
* build_udp_v6_csum - compute UDP checksum for UDP over IPv6
*
* Compute the checksum to embed in UDP header, composed of the sum of IPv6
* pseudo-header checksum, UDP header checksum and UDP data checksum
* @ip6h IPv6 header
* @udph UDP header, which must be immediately followed by UDP data
*
* Returns the total checksum
*/
static inline __sum16 build_udp_v6_csum(const struct ipv6hdr *ip6h,
const struct udphdr *udph)
{
unsigned long sum;
sum = csum_partial(udph, ntohs(udph->len), 0);
return csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ntohs(udph->len),
IPPROTO_UDP, sum);
}
struct tmonitor_ctx;
#ifdef TRAFFIC_MONITOR