[PATCH bpf-next 1/2] bpf: Expose bpf_get_socket_cookie to tracing programs

[Florent Revest]

This creates a new helper proto because the existing
bpf_get_socket_cookie_sock_proto has a ARG_PTR_TO_CTX argument and only
works for BPF programs where the context is a sock.

This helper could also be useful to other BPF program types such as LSM.

Signed-off-by: Florent Revest <rev...@google.com>
---
 kernel/trace/bpf_trace.c | 4 ++++
 net/core/filter.c        | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index d255bc9b2bfa..14ad96579813 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1725,6 +1725,8 @@ raw_tp_prog_func_proto(enum bpf_func_id func_id, const 
struct bpf_prog *prog)
        }
 }
 
+extern const struct bpf_func_proto bpf_get_socket_cookie_sock_tracing_proto;
+
 const struct bpf_func_proto *
 tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 {
@@ -1748,6 +1750,8 @@ tracing_prog_func_proto(enum bpf_func_id func_id, const 
struct bpf_prog *prog)
                return &bpf_sk_storage_get_tracing_proto;
        case BPF_FUNC_sk_storage_delete:
                return &bpf_sk_storage_delete_tracing_proto;
+       case BPF_FUNC_get_socket_cookie:
+               return &bpf_get_socket_cookie_sock_tracing_proto;
 #endif
        case BPF_FUNC_seq_printf:
                return prog->expected_attach_type == BPF_TRACE_ITER ?
diff --git a/net/core/filter.c b/net/core/filter.c
index 2ca5eecebacf..177c4e5e529d 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4631,6 +4631,13 @@ static const struct bpf_func_proto 
bpf_get_socket_cookie_sock_proto = {
        .arg1_type      = ARG_PTR_TO_CTX,
 };
 
+const struct bpf_func_proto bpf_get_socket_cookie_sock_tracing_proto = {
+       .func           = bpf_get_socket_cookie_sock,
+       .gpl_only       = false,
+       .ret_type       = RET_INTEGER,
+       .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
+};
+
 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
 {
        return __sock_gen_cookie(ctx->sk);
-- 
2.29.2.454.gaff20da3a2-goog