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selftests/bpf: move ip checksum helper to network helpers

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xdp_metadata test has a small helper computing ipv4 checksums to allow
manually building packets.

Move this helper to network_helpers to share it with other tests.

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-v3-9-45b46494f937@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2024-11-20 08:43:19 +01:00
committed by Alexei Starovoitov
parent c24010821a
commit f4504af685
2 changed files with 25 additions and 18 deletions
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24
tools/testing/selftests/bpf/network_helpers.h
View File

@@ -105,6 +105,30 @@ static __u16 csum_fold(__u32 csum)
return (__u16)~csum;
}
static __wsum csum_partial(const void *buf, int len, __wsum sum)
{
__u16 *p = (__u16 *)buf;
int num_u16 = len >> 1;
int i;
for (i = 0; i < num_u16; i++)
sum += p[i];
return sum;
}
static inline __sum16 build_ip_csum(struct iphdr *iph)
{
__u32 sum = 0;
__u16 *p;
iph->check = 0;
p = (void *)iph;
sum = csum_partial(p, iph->ihl << 2, 0);
return csum_fold(sum);
}
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto,
__wsum csum)

19
tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
View File

@@ -133,23 +133,6 @@ static void close_xsk(struct xsk *xsk)
munmap(xsk->umem_area, UMEM_SIZE);
}
static void ip_csum(struct iphdr *iph)
{
__u32 sum = 0;
__u16 *p;
int i;
iph->check = 0;
p = (void *)iph;
for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
sum += p[i];
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
iph->check = ~sum;
}
static int generate_packet(struct xsk *xsk, __u16 dst_port)
{
struct xsk_tx_metadata *meta;
@@ -192,7 +175,7 @@ static int generate_packet(struct xsk *xsk, __u16 dst_port)
iph->protocol = IPPROTO_UDP;
ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
ip_csum(iph);
iph->check = build_ip_csum(iph);
udph->source = htons(UDP_SOURCE_PORT);
udph->dest = htons(dst_port);