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bpf: Support narrow loads from bpf_sock_addr.user_port
bpf_sock_addr.user_port supports only 4-byte load and it leads to ugly code in BPF programs, like: volatile __u32 user_port = ctx->user_port; __u16 port = bpf_ntohs(user_port); Since otherwise clang may optimize the load to be 2-byte and it's rejected by verifier. Add support for 1- and 2-byte loads same way as it's supported for other fields in bpf_sock_addr like user_ip4, msg_src_ip4, etc. Signed-off-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/c1e983f4c17573032601d0b2b1f9d1274f24bc16.1589420814.git.rdna@fb.com
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@ -3728,7 +3728,7 @@ struct bpf_sock_addr {
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__u32 user_ip6[4]; /* Allows 1,2,4,8-byte read and 4,8-byte write.
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* Stored in network byte order.
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*/
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__u32 user_port; /* Allows 4-byte read and write.
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__u32 user_port; /* Allows 1,2,4-byte read and 4-byte write.
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* Stored in network byte order
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*/
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__u32 family; /* Allows 4-byte read, but no write */
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