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bpf: Add PROG_TEST_RUN support for sk_lookup programs

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Allow to pass sk_lookup programs to PROG_TEST_RUN. User space
provides the full bpf_sk_lookup struct as context. Since the
context includes a socket pointer that can't be exposed
to user space we define that PROG_TEST_RUN returns the cookie
of the selected socket or zero in place of the socket pointer.

We don't support testing programs that select a reuseport socket,
since this would mean running another (unrelated) BPF program
from the sk_lookup test handler.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210303101816.36774-3-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer 2021-03-03 10:18:13 +00:00 • committed by Alexei Starovoitov
parent 607b9cc92b
commit 7c32e8f8bc
5 changed files with 124 additions and 2 deletions
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5
tools/include/uapi/linux/bpf.h
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@ -5953,7 +5953,10 @@ struct bpf_pidns_info {
/* User accessible data for SK_LOOKUP programs. Add new fields at the end. */
struct bpf_sk_lookup {
__bpf_md_ptr(struct bpf_sock *, sk); /* Selected socket */
union {
__bpf_md_ptr(struct bpf_sock *, sk); /* Selected socket */
__u64 cookie; /* Non-zero if socket was selected in PROG_TEST_RUN */
};
__u32 family; /* Protocol family (AF_INET, AF_INET6) */
__u32 protocol; /* IP protocol (IPPROTO_TCP, IPPROTO_UDP) */