selftests/bpf: convert bpf_rdonly_cast() uses to bpf_core_cast() macro

Use more ergonomic bpf_core_cast() macro instead of bpf_rdonly_cast() in
selftests code.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240130212023.183765-3-andrii@kernel.orgSigned-off-by: Martin KaFai Lau <martin.lau@kernel.org>

tools/testing/selftests/bpf/progs/connect_unix_prog.c

@@ -28,8 +28,7 @@ int connect_unix_prog(struct bpf_sock_addr *ctx)
 	if (sa_kern->uaddrlen != unaddrlen)
 		return 0;
 
-	sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
-						bpf_core_type_id_kernel(struct sockaddr_un));
+	sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
 	if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
 			sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
 		return 0;

tools/testing/selftests/bpf/progs/getpeername_unix_prog.c

@@ -27,8 +27,7 @@ int getpeername_unix_prog(struct bpf_sock_addr *ctx)
 	if (sa_kern->uaddrlen != unaddrlen)
 		return 1;
 
-	sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
-						bpf_core_type_id_kernel(struct sockaddr_un));
+	sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
 	if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
 			sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
 		return 1;

tools/testing/selftests/bpf/progs/getsockname_unix_prog.c

@@ -27,8 +27,7 @@ int getsockname_unix_prog(struct bpf_sock_addr *ctx)
 	if (sa_kern->uaddrlen != unaddrlen)
 		return 1;
 
-	sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
-						bpf_core_type_id_kernel(struct sockaddr_un));
+	sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
 	if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
 			sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
 		return 1;

tools/testing/selftests/bpf/progs/recvmsg_unix_prog.c

@@ -27,8 +27,7 @@ int recvmsg_unix_prog(struct bpf_sock_addr *ctx)
 	if (sa_kern->uaddrlen != unaddrlen)
 		return 1;
 
-	sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
-						bpf_core_type_id_kernel(struct sockaddr_un));
+	sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
 	if (memcmp(sa_kern_unaddr->sun_path, SERVUN_ADDRESS,
 			sizeof(SERVUN_ADDRESS) - 1) != 0)
 		return 1;

tools/testing/selftests/bpf/progs/sendmsg_unix_prog.c

@@ -28,8 +28,7 @@ int sendmsg_unix_prog(struct bpf_sock_addr *ctx)
 	if (sa_kern->uaddrlen != unaddrlen)
 		return 0;
 
-	sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
-						bpf_core_type_id_kernel(struct sockaddr_un));
+	sa_kern_unaddr = bpf_core_cast(sa_kern->uaddr, struct sockaddr_un);
 	if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
 			sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
 		return 0;

tools/testing/selftests/bpf/progs/sk_storage_omem_uncharge.c

@@ -27,7 +27,7 @@ int BPF_PROG(bpf_local_storage_destroy, struct bpf_local_storage *local_storage)
 	if (local_storage_ptr != local_storage)
 		return 0;
 
-	sk = bpf_rdonly_cast(sk_ptr, bpf_core_type_id_kernel(struct sock));
+	sk = bpf_core_cast(sk_ptr, struct sock);
 	if (sk->sk_cookie.counter != cookie)
 		return 0;
 

tools/testing/selftests/bpf/progs/sock_iter_batch.c

@@ -32,7 +32,7 @@ int iter_tcp_soreuse(struct bpf_iter__tcp *ctx)
 	if (!sk)
 		return 0;
 
-	sk = bpf_rdonly_cast(sk, bpf_core_type_id_kernel(struct sock));
+	sk = bpf_core_cast(sk, struct sock);
 	if (sk->sk_family != AF_INET6 ||
 	    sk->sk_state != TCP_LISTEN ||
 	    !ipv6_addr_loopback(&sk->sk_v6_rcv_saddr))
@@ -68,7 +68,7 @@ int iter_udp_soreuse(struct bpf_iter__udp *ctx)
 	if (!sk)
 		return 0;
 
-	sk = bpf_rdonly_cast(sk, bpf_core_type_id_kernel(struct sock));
+	sk = bpf_core_cast(sk, struct sock);
 	if (sk->sk_family != AF_INET6 ||
 	    !ipv6_addr_loopback(&sk->sk_v6_rcv_saddr))
 		return 0;

tools/testing/selftests/bpf/progs/type_cast.c

@@ -46,13 +46,12 @@ int md_skb(struct __sk_buff *skb)
 	/* Simulate the following kernel macro:
 	 *   #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
 	 */
-	shared_info = bpf_rdonly_cast(kskb->head + kskb->end,
-		bpf_core_type_id_kernel(struct skb_shared_info));
+	shared_info = bpf_core_cast(kskb->head + kskb->end, struct skb_shared_info);
 	meta_len = shared_info->meta_len;
 	frag0_len = shared_info->frag_list->len;
 
 	/* kskb2 should be equal to kskb */
-	kskb2 = bpf_rdonly_cast(kskb, bpf_core_type_id_kernel(struct sk_buff));
+	kskb2 = bpf_core_cast(kskb, typeof(*kskb2));
 	kskb2_len = kskb2->len;
 	return 0;
 }
@@ -63,7 +62,7 @@ int BPF_PROG(untrusted_ptr, struct pt_regs *regs, long id)
 	struct task_struct *task, *task_dup;
 
 	task = bpf_get_current_task_btf();
-	task_dup = bpf_rdonly_cast(task, bpf_core_type_id_kernel(struct task_struct));
+	task_dup = bpf_core_cast(task, struct task_struct);
 	(void)bpf_task_storage_get(&enter_id, task_dup, 0, 0);
 	return 0;
 }
@@ -71,7 +70,7 @@ int BPF_PROG(untrusted_ptr, struct pt_regs *regs, long id)
 SEC("?tracepoint/syscalls/sys_enter_nanosleep")
 int kctx_u64(void *ctx)
 {
-	u64 *kctx = bpf_rdonly_cast(ctx, bpf_core_type_id_kernel(u64));
+	u64 *kctx = bpf_core_cast(ctx, u64);
 
 	(void)kctx;
 	return 0;