selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads

Add coverage to the verifier tests and tests for reading bpf_sock fields to ensure that 32-bit, 16-bit, and 8-bit loads from dst_port field are allowed only at intended offsets and produce expected values. While 16-bit and 8-bit access to dst_port field is straight-forward, 32-bit wide loads need be allowed and produce a zero-padded 16-bit value for backward compatibility.

Jakub Sitnicki committed 4 years ago

Commit 8f50f161 parent 4421a584 files · +162 −21Browse files

Showing the changes to tools/include/uapi (1 of 4 files). Show all

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tools/include/uapi/linux/bpf.h+2−1

@@ -5574,7 +5574,8 @@ struct bpf_sock { · 5573 unmodified lines
5574	5574	__u32 src_ip4;
5575	5575	__u32 src_ip6[4];
5576	5576	__u32 src_port; /* host byte order */
5577		− __u32 dst_port; /* network byte order */
	5577	+ __be16 dst_port; /* network byte order */
	5578	+ __u16 :16; /* zero padding */
5578	5579	__u32 dst_ip4;
5579	5580	__u32 dst_ip6[4];
5580	5581	__u32 state;