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Date: Fri, 12 Apr 2024 18:26:32 -0700
From: Kui-Feng Lee <sinquersw@...il.com>
To: Jordan Rife <jrife@...gle.com>, bpf@...r.kernel.org
Cc: 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: Re: [PATCH v2 bpf-next 2/6] selftests/bpf: Implement socket kfuncs
for bpf_testmod
On 4/12/24 09:52, Jordan Rife wrote:
> 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;
It would be better to check if args->msglen > sizeof(arg->msg) although
this function is just for test cases. Same for args->addr.addrlen.
> +
> + 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 */
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