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authorJakub Sitnicki <jakub@cloudflare.com>2022-02-09 19:43:33 +0100
committerAlexei Starovoitov <ast@kernel.org>2022-02-09 20:40:45 +0100
commit2ed0dc5937d38f282841d22c5a5354ec264c7b8d (patch)
tree427e6ef1e3229dae55160bdb5c69896f5ddfa7f5 /tools/testing
parentbpf: Make remote_port field in struct bpf_sk_lookup 16-bit wide (diff)
downloadlinux-2ed0dc5937d38f282841d22c5a5354ec264c7b8d.tar.xz
linux-2ed0dc5937d38f282841d22c5a5354ec264c7b8d.zip
selftests/bpf: Cover 4-byte load from remote_port in bpf_sk_lookup
Extend the context access tests for sk_lookup prog to cover the surprising case of a 4-byte load from the remote_port field, where the expected value is actually shifted by 16 bits. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20220209184333.654927-3-jakub@cloudflare.com
Diffstat (limited to 'tools/testing')
-rw-r--r--tools/testing/selftests/bpf/progs/test_sk_lookup.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_sk_lookup.c b/tools/testing/selftests/bpf/progs/test_sk_lookup.c
index 83b0aaa52ef7..bf5b7caefdd0 100644
--- a/tools/testing/selftests/bpf/progs/test_sk_lookup.c
+++ b/tools/testing/selftests/bpf/progs/test_sk_lookup.c
@@ -392,6 +392,7 @@ int ctx_narrow_access(struct bpf_sk_lookup *ctx)
{
struct bpf_sock *sk;
int err, family;
+ __u32 val_u32;
bool v4;
v4 = (ctx->family == AF_INET);
@@ -418,6 +419,11 @@ int ctx_narrow_access(struct bpf_sk_lookup *ctx)
if (LSW(ctx->remote_port, 0) != SRC_PORT)
return SK_DROP;
+ /* Load from remote_port field with zero padding (backward compatibility) */
+ val_u32 = *(__u32 *)&ctx->remote_port;
+ if (val_u32 != bpf_htonl(bpf_ntohs(SRC_PORT) << 16))
+ return SK_DROP;
+
/* Narrow loads from local_port field. Expect DST_PORT. */
if (LSB(ctx->local_port, 0) != ((DST_PORT >> 0) & 0xff) ||
LSB(ctx->local_port, 1) != ((DST_PORT >> 8) & 0xff) ||