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derp/xdp: fix handling of zero value UDP checksums (#12510)

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validate_udp_checksum was previously indeterminate (not zero) at
declaration, and IPv4 zero value UDP checksum packets were being passed
to the kernel.

Updates tailscale/corp#20689

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2024-06-17 14:06:53 -07:00
committed by GitHub
parent 8cc2738609
commit 315f3d5df1
4 changed files with 49 additions and 1 deletions
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2
derp/xdp/xdp.c
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@@ -244,7 +244,7 @@ static __always_inline int handle_packet(struct xdp_md *ctx, struct packet_conte
struct ipv6hdr *ip6;
struct udphdr *udp;
int validate_udp_csum;
int validate_udp_csum = 0;
if (eth->h_proto == bpf_htons(ETH_P_IP)) {
pctx->af = COUNTER_KEY_AF_IPV4;
ip = (void *)(eth + 1);