Message-ID: <20240412165230.2009746-3-jrife@google.com>
Date: Fri, 12 Apr 2024 11:52:23 -0500
From: Jordan Rife <jrife@...gle.com>
To: bpf@...r.kernel.org
Cc: Jordan Rife <jrife@...gle.com>, linux-kselftest@...r.kernel.org, 
	netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	Kui-Feng Lee <thinker.li@...il.com>, Artem Savkov <asavkov@...hat.com>, 
	Dave Marchevsky <davemarchevsky@...com>, Menglong Dong <imagedong@...cent.com>, Daniel Xu <dxu@...uu.xyz>, 
	David Vernet <void@...ifault.com>, Daan De Meyer <daan.j.demeyer@...il.com>, 
	Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: [PATCH v2 bpf-next 2/6] selftests/bpf: Implement socket kfuncs for bpf_testmod

This patch adds a set of kfuncs to bpf_testmod that can be used to
manipulate a socket from kernel space.

Signed-off-by: Jordan Rife <jrife@...gle.com>
---
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   | 139 ++++++++++++++++++
 .../bpf/bpf_testmod/bpf_testmod_kfunc.h       |  27 ++++
 2 files changed, 166 insertions(+)

diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index 39ad96a18123f..663df8148097e 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -10,18 +10,29 @@
 #include <linux/percpu-defs.h>
 #include <linux/sysfs.h>
 #include <linux/tracepoint.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/nsproxy.h>
+#include <linux/inet.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/un.h>
+#include <net/sock.h>
 #include "bpf_testmod.h"
 #include "bpf_testmod_kfunc.h"
 
 #define CREATE_TRACE_POINTS
 #include "bpf_testmod-events.h"
 
+#define CONNECT_TIMEOUT_SEC 1
+
 typedef int (*func_proto_typedef)(long);
 typedef int (*func_proto_typedef_nested1)(func_proto_typedef);
 typedef int (*func_proto_typedef_nested2)(func_proto_typedef_nested1);
 
 DEFINE_PER_CPU(int, bpf_testmod_ksym_percpu) = 123;
 long bpf_testmod_test_struct_arg_result;
+static struct socket *sock;
 
 struct bpf_testmod_struct_arg_1 {
 	int a;
@@ -494,6 +505,124 @@ __bpf_kfunc static u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused
 	return arg;
 }
 
+__bpf_kfunc int bpf_kfunc_init_sock(struct init_sock_args *args)
+{
+	int proto;
+
+	if (sock)
+		pr_warn("%s called without releasing old sock", __func__);
+
+	switch (args->af) {
+	case AF_INET:
+	case AF_INET6:
+		proto = args->type == SOCK_STREAM ? IPPROTO_TCP : IPPROTO_UDP;
+		break;
+	case AF_UNIX:
+		proto = PF_UNIX;
+		break;
+	default:
+		pr_err("invalid address family %d\n", args->af);
+		return -EINVAL;
+	}
+
+	return sock_create_kern(&init_net, args->af, args->type, proto, &sock);
+}
+
+__bpf_kfunc void bpf_kfunc_close_sock(void)
+{
+	if (sock) {
+		sock_release(sock);
+		sock = NULL;
+	}
+}
+
+__bpf_kfunc int bpf_kfunc_call_kernel_connect(struct addr_args *args)
+{
+	/* Set timeout for call to kernel_connect() to prevent it from hanging,
+	 * and consider the connection attempt failed if it returns
+	 * -EINPROGRESS.
+	 */
+	sock->sk->sk_sndtimeo = CONNECT_TIMEOUT_SEC * HZ;
+
+	return kernel_connect(sock, (struct sockaddr *)&args->addr,
+			      args->addrlen, 0);
+}
+
+__bpf_kfunc int bpf_kfunc_call_kernel_bind(struct addr_args *args)
+{
+	return kernel_bind(sock, (struct sockaddr *)&args->addr, args->addrlen);
+}
+
+__bpf_kfunc int bpf_kfunc_call_kernel_listen(void)
+{
+	return kernel_listen(sock, 128);
+}
+
+__bpf_kfunc int bpf_kfunc_call_kernel_sendmsg(struct sendmsg_args *args)
+{
+	struct msghdr msg = {
+		.msg_name	= &args->addr.addr,
+		.msg_namelen	= args->addr.addrlen,
+	};
+	struct kvec iov;
+	int err;
+
+	iov.iov_base = args->msg;
+	iov.iov_len  = args->msglen;
+
+	err = kernel_sendmsg(sock, &msg, &iov, 1, args->msglen);
+	args->addr.addrlen = msg.msg_namelen;
+
+	return err;
+}
+
+__bpf_kfunc int bpf_kfunc_call_sock_sendmsg(struct sendmsg_args *args)
+{
+	struct msghdr msg = {
+		.msg_name	= &args->addr.addr,
+		.msg_namelen	= args->addr.addrlen,
+	};
+	struct kvec iov;
+	int err;
+
+	iov.iov_base = args->msg;
+	iov.iov_len  = args->msglen;
+
+	iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, &iov, 1, args->msglen);
+	err = sock_sendmsg(sock, &msg);
+	args->addr.addrlen = msg.msg_namelen;
+
+	return err;
+}
+
+__bpf_kfunc int bpf_kfunc_call_kernel_getsockname(struct addr_args *args)
+{
+	int err;
+
+	err = kernel_getsockname(sock, (struct sockaddr *)&args->addr);
+	if (err < 0)
+		goto out;
+
+	args->addrlen = err;
+	err = 0;
+out:
+	return err;
+}
+
+__bpf_kfunc int bpf_kfunc_call_kernel_getpeername(struct addr_args *args)
+{
+	int err;
+
+	err = kernel_getpeername(sock, (struct sockaddr *)&args->addr);
+	if (err < 0)
+		goto out;
+
+	args->addrlen = err;
+	err = 0;
+out:
+	return err;
+}
+
 BTF_KFUNCS_START(bpf_testmod_check_kfunc_ids)
 BTF_ID_FLAGS(func, bpf_testmod_test_mod_kfunc)
 BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
@@ -520,6 +649,15 @@ BTF_ID_FLAGS(func, bpf_kfunc_call_test_ref, KF_TRUSTED_ARGS | KF_RCU)
 BTF_ID_FLAGS(func, bpf_kfunc_call_test_destructive, KF_DESTRUCTIVE)
 BTF_ID_FLAGS(func, bpf_kfunc_call_test_static_unused_arg)
 BTF_ID_FLAGS(func, bpf_kfunc_call_test_offset)
+BTF_ID_FLAGS(func, bpf_kfunc_init_sock)
+BTF_ID_FLAGS(func, bpf_kfunc_close_sock)
+BTF_ID_FLAGS(func, bpf_kfunc_call_kernel_connect)
+BTF_ID_FLAGS(func, bpf_kfunc_call_kernel_bind)
+BTF_ID_FLAGS(func, bpf_kfunc_call_kernel_listen)
+BTF_ID_FLAGS(func, bpf_kfunc_call_kernel_sendmsg)
+BTF_ID_FLAGS(func, bpf_kfunc_call_sock_sendmsg)
+BTF_ID_FLAGS(func, bpf_kfunc_call_kernel_getsockname)
+BTF_ID_FLAGS(func, bpf_kfunc_call_kernel_getpeername)
 BTF_KFUNCS_END(bpf_testmod_check_kfunc_ids)
 
 static int bpf_testmod_ops_init(struct btf *btf)
@@ -650,6 +788,7 @@ static int bpf_testmod_init(void)
 		return ret;
 	if (bpf_fentry_test1(0) < 0)
 		return -EINVAL;
+	sock = NULL;
 	return sysfs_create_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
 }
 
diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h
index 7c664dd610597..cdf7769a7d8ca 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h
@@ -64,6 +64,22 @@ struct prog_test_fail3 {
 	char arr2[];
 };
 
+struct init_sock_args {
+	int af;
+	int type;
+};
+
+struct addr_args {
+	char addr[sizeof(struct __kernel_sockaddr_storage)];
+	int addrlen;
+};
+
+struct sendmsg_args {
+	struct addr_args addr;
+	char msg[10];
+	int msglen;
+};
+
 struct prog_test_ref_kfunc *
 bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr) __ksym;
 void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
@@ -106,4 +122,15 @@ void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p);
 void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len);
 
 void bpf_kfunc_common_test(void) __ksym;
+
+int bpf_kfunc_init_sock(struct init_sock_args *args) __ksym;
+void bpf_kfunc_close_sock(void) __ksym;
+int bpf_kfunc_call_kernel_connect(struct addr_args *args) __ksym;
+int bpf_kfunc_call_kernel_bind(struct addr_args *args) __ksym;
+int bpf_kfunc_call_kernel_listen(void) __ksym;
+int bpf_kfunc_call_kernel_sendmsg(struct sendmsg_args *args) __ksym;
+int bpf_kfunc_call_sock_sendmsg(struct sendmsg_args *args) __ksym;
+int bpf_kfunc_call_kernel_getsockname(struct addr_args *args) __ksym;
+int bpf_kfunc_call_kernel_getpeername(struct addr_args *args) __ksym;
+
 #endif /* _BPF_TESTMOD_KFUNC_H */
-- 
2.44.0.478.gd926399ef9-goog

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