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Message-ID: <20230831153455.1867110-10-daan.j.demeyer@gmail.com>
Date: Thu, 31 Aug 2023 17:34:53 +0200
From: Daan De Meyer <daan.j.demeyer@...il.com>
To: bpf@...r.kernel.org
Cc: Daan De Meyer <daan.j.demeyer@...il.com>,
martin.lau@...ux.dev,
kernel-team@...a.com,
netdev@...r.kernel.org
Subject: [PATCH bpf-next v3 9/9] selftests/bpf: Add tests for cgroup unix socket address hooks
These selftests are written in prog_tests style instead of adding
them to the existing test_sock_addr tests. Migrating the existing
sock addr tests to prog_tests style is left for future work.
Signed-off-by: Daan De Meyer <daan.j.demeyer@...il.com>
---
tools/testing/selftests/bpf/bpf_kfuncs.h | 14 +
tools/testing/selftests/bpf/network_helpers.c | 34 ++
tools/testing/selftests/bpf/network_helpers.h | 1 +
.../selftests/bpf/prog_tests/section_names.c | 30 ++
.../selftests/bpf/prog_tests/sock_addr.c | 461 ++++++++++++++++++
.../testing/selftests/bpf/progs/bindun_prog.c | 39 ++
.../selftests/bpf/progs/connectun_prog.c | 40 ++
.../selftests/bpf/progs/recvmsgun_prog.c | 39 ++
.../selftests/bpf/progs/sendmsgun_prog.c | 40 ++
9 files changed, 698 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/sock_addr.c
create mode 100644 tools/testing/selftests/bpf/progs/bindun_prog.c
create mode 100644 tools/testing/selftests/bpf/progs/connectun_prog.c
create mode 100644 tools/testing/selftests/bpf/progs/recvmsgun_prog.c
create mode 100644 tools/testing/selftests/bpf/progs/sendmsgun_prog.c
diff --git a/tools/testing/selftests/bpf/bpf_kfuncs.h b/tools/testing/selftests/bpf/bpf_kfuncs.h
index 642dda0e758a..aa376792c4a4 100644
--- a/tools/testing/selftests/bpf/bpf_kfuncs.h
+++ b/tools/testing/selftests/bpf/bpf_kfuncs.h
@@ -1,6 +1,8 @@
#ifndef __BPF_KFUNCS__
#define __BPF_KFUNCS__
+struct bpf_sock_addr_kern;
+
/* Description
* Initializes an skb-type dynptr
* Returns
@@ -41,4 +43,16 @@ extern bool bpf_dynptr_is_rdonly(const struct bpf_dynptr *ptr) __ksym;
extern __u32 bpf_dynptr_size(const struct bpf_dynptr *ptr) __ksym;
extern int bpf_dynptr_clone(const struct bpf_dynptr *ptr, struct bpf_dynptr *clone__init) __ksym;
+/* Description
+ * Modify the address of a AF_UNIX sockaddr.
+ * Returns__bpf_kfunc
+ * -EINVAL if the address size is too big or, 0 if the sockaddr was successfully modified.
+ */
+extern int bpf_sock_addr_set_unix_addr(struct bpf_sock_addr_kern *sa_kern,
+ const __u8 *addr, __u32 addrlen__sz) __ksym;
+
+void *bpf_cast_to_kern_ctx(void *) __ksym;
+
+void *bpf_rdonly_cast(void *obj, __u32 btf_id) __ksym;
+
#endif
diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index da72a3a66230..6db27a9088e9 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -11,6 +11,7 @@
#include <arpa/inet.h>
#include <sys/mount.h>
#include <sys/stat.h>
+#include <sys/un.h>
#include <linux/err.h>
#include <linux/in.h>
@@ -257,6 +258,26 @@ static int connect_fd_to_addr(int fd,
return 0;
}
+int connect_to_addr(const struct sockaddr_storage *addr, socklen_t addrlen, int type)
+{
+ int fd;
+
+ fd = socket(addr->ss_family, type, 0);
+ if (fd < 0) {
+ log_err("Failed to create client socket");
+ return -1;
+ }
+
+ if (connect_fd_to_addr(fd, addr, addrlen, false))
+ goto error_close;
+
+ return fd;
+
+error_close:
+ save_errno_close(fd);
+ return -1;
+}
+
static const struct network_helper_opts default_opts;
int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
@@ -380,6 +401,19 @@ int make_sockaddr(int family, const char *addr_str, __u16 port,
if (len)
*len = sizeof(*sin6);
return 0;
+ } else if (family == AF_UNIX) {
+ /* Note that we always use abstract unix sockets to avoid having
+ * to clean up leftover files.
+ */
+ struct sockaddr_un *sun = (void *)addr;
+
+ memset(addr, 0, sizeof(*sun));
+ sun->sun_family = family;
+ sun->sun_path[0] = 0;
+ strcpy(sun->sun_path + 1, addr_str);
+ if (len)
+ *len = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(addr_str);
+ return 0;
}
return -1;
}
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index 5eccc67d1a99..34f1200a781b 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -51,6 +51,7 @@ int *start_reuseport_server(int family, int type, const char *addr_str,
__u16 port, int timeout_ms,
unsigned int nr_listens);
void free_fds(int *fds, unsigned int nr_close_fds);
+int connect_to_addr(const struct sockaddr_storage *addr, socklen_t len, int type);
int connect_to_fd(int server_fd, int timeout_ms);
int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms);
diff --git a/tools/testing/selftests/bpf/prog_tests/section_names.c b/tools/testing/selftests/bpf/prog_tests/section_names.c
index fc5248e94a01..51ebc8e6065d 100644
--- a/tools/testing/selftests/bpf/prog_tests/section_names.c
+++ b/tools/testing/selftests/bpf/prog_tests/section_names.c
@@ -113,6 +113,11 @@ static struct sec_name_test tests[] = {
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_INET6_BIND},
{0, BPF_CGROUP_INET6_BIND},
},
+ {
+ "cgroup/bindun",
+ {0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UNIX_BIND},
+ {0, BPF_CGROUP_UNIX_BIND},
+ },
{
"cgroup/connect4",
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_INET4_CONNECT},
@@ -123,6 +128,11 @@ static struct sec_name_test tests[] = {
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_INET6_CONNECT},
{0, BPF_CGROUP_INET6_CONNECT},
},
+ {
+ "cgroup/connectun",
+ {0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UNIX_CONNECT},
+ {0, BPF_CGROUP_UNIX_CONNECT},
+ },
{
"cgroup/sendmsg4",
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UDP4_SENDMSG},
@@ -133,6 +143,11 @@ static struct sec_name_test tests[] = {
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UDP6_SENDMSG},
{0, BPF_CGROUP_UDP6_SENDMSG},
},
+ {
+ "cgroup/sendmsgun",
+ {0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UNIX_SENDMSG},
+ {0, BPF_CGROUP_UNIX_SENDMSG},
+ },
{
"cgroup/recvmsg4",
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UDP4_RECVMSG},
@@ -143,6 +158,11 @@ static struct sec_name_test tests[] = {
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UDP6_RECVMSG},
{0, BPF_CGROUP_UDP6_RECVMSG},
},
+ {
+ "cgroup/recvmsgun",
+ {0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UNIX_RECVMSG},
+ {0, BPF_CGROUP_UNIX_RECVMSG},
+ },
{
"cgroup/sysctl",
{0, BPF_PROG_TYPE_CGROUP_SYSCTL, BPF_CGROUP_SYSCTL},
@@ -168,6 +188,11 @@ static struct sec_name_test tests[] = {
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_INET6_GETPEERNAME},
{0, BPF_CGROUP_INET6_GETPEERNAME},
},
+ {
+ "cgroup/getpeernameun",
+ {0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UNIX_GETPEERNAME},
+ {0, BPF_CGROUP_UNIX_GETPEERNAME},
+ },
{
"cgroup/getsockname4",
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_INET4_GETSOCKNAME},
@@ -178,6 +203,11 @@ static struct sec_name_test tests[] = {
{0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_INET6_GETSOCKNAME},
{0, BPF_CGROUP_INET6_GETSOCKNAME},
},
+ {
+ "cgroup/getsocknameun",
+ {0, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, BPF_CGROUP_UNIX_GETSOCKNAME},
+ {0, BPF_CGROUP_UNIX_GETSOCKNAME},
+ },
};
static void test_prog_type_by_name(const struct sec_name_test *test)
diff --git a/tools/testing/selftests/bpf/prog_tests/sock_addr.c b/tools/testing/selftests/bpf/prog_tests/sock_addr.c
new file mode 100644
index 000000000000..07941dd48efb
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/sock_addr.c
@@ -0,0 +1,461 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <sys/un.h>
+
+#include "test_progs.h"
+
+#include "bindun_prog.skel.h"
+#include "connectun_prog.skel.h"
+#include "sendmsgun_prog.skel.h"
+#include "recvmsgun_prog.skel.h"
+#include "network_helpers.h"
+
+#define SERVUN_ADDRESS "bpf_cgroup_unix_test"
+#define SERVUN_REWRITE_ADDRESS "bpf_cgroup_unix_test_rewrite"
+#define SRCUN_ADDRESS "bpf_cgroup_unix_test_src"
+
+enum sock_addr_test_type {
+ SOCK_ADDR_TEST_BIND,
+ SOCK_ADDR_TEST_CONNECT,
+ SOCK_ADDR_TEST_SENDMSG,
+ SOCK_ADDR_TEST_RECVMSG,
+};
+
+struct sock_addr_test;
+
+typedef void *(*load_fn)(int cgroup_fd);
+typedef void (*destroy_fn)(void *skel);
+
+struct sock_addr_test {
+ enum sock_addr_test_type type;
+ const char *name;
+ /* BPF prog properties */
+ load_fn loadfn;
+ destroy_fn destroyfn;
+ /* Socket properties */
+ int socket_family;
+ int socket_type;
+ /* IP:port pairs for BPF prog to override */
+ const char *requested_addr;
+ unsigned short requested_port;
+ const char *expected_addr;
+ unsigned short expected_port;
+ const char *expected_src_addr;
+};
+
+static void *bindun_prog_load(int cgroup_fd)
+{
+ struct bindun_prog *skel;
+
+ skel = bindun_prog__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ goto cleanup;
+
+ skel->links.bindun_prog = bpf_program__attach_cgroup(
+ skel->progs.bindun_prog, cgroup_fd);
+ if (!ASSERT_OK_PTR(skel->links.bindun_prog, "prog_attach"))
+ goto cleanup;
+
+ return skel;
+cleanup:
+ bindun_prog__destroy(skel);
+ return NULL;
+}
+
+static void bindun_prog_destroy(void *skel)
+{
+ bindun_prog__destroy(skel);
+}
+
+static void *connectun_prog_load(int cgroup_fd)
+{
+ struct connectun_prog *skel;
+
+ skel = connectun_prog__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ goto cleanup;
+
+ skel->links.connectun_prog = bpf_program__attach_cgroup(
+ skel->progs.connectun_prog, cgroup_fd);
+ if (!ASSERT_OK_PTR(skel->links.connectun_prog, "prog_attach"))
+ goto cleanup;
+
+ return skel;
+cleanup:
+ connectun_prog__destroy(skel);
+ return NULL;
+}
+
+static void connectun_prog_destroy(void *skel)
+{
+ connectun_prog__destroy(skel);
+}
+
+static void *sendmsgun_prog_load(int cgroup_fd)
+{
+ struct sendmsgun_prog *skel;
+
+ skel = sendmsgun_prog__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ goto cleanup;
+
+ skel->links.sendmsgun_prog = bpf_program__attach_cgroup(
+ skel->progs.sendmsgun_prog, cgroup_fd);
+ if (!ASSERT_OK_PTR(skel->links.sendmsgun_prog, "prog_attach"))
+ goto cleanup;
+
+ return skel;
+cleanup:
+ sendmsgun_prog__destroy(skel);
+ return NULL;
+}
+
+static void sendmsgun_prog_destroy(void *skel)
+{
+ sendmsgun_prog__destroy(skel);
+}
+
+static void *recvmsgun_prog_load(int cgroup_fd)
+{
+ struct recvmsgun_prog *skel;
+
+ skel = recvmsgun_prog__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ goto cleanup;
+
+ skel->links.recvmsgun_prog = bpf_program__attach_cgroup(
+ skel->progs.recvmsgun_prog, cgroup_fd);
+ if (!ASSERT_OK_PTR(skel->links.recvmsgun_prog, "prog_attach"))
+ goto cleanup;
+
+ return skel;
+cleanup:
+ recvmsgun_prog__destroy(skel);
+ return NULL;
+}
+
+static void recvmsgun_prog_destroy(void *skel)
+{
+ recvmsgun_prog__destroy(skel);
+}
+
+static struct sock_addr_test tests[] = {
+ {
+ SOCK_ADDR_TEST_BIND,
+ "bindun",
+ bindun_prog_load,
+ bindun_prog_destroy,
+ AF_UNIX,
+ SOCK_STREAM,
+ SERVUN_ADDRESS,
+ 0,
+ SERVUN_REWRITE_ADDRESS,
+ 0,
+ NULL,
+ },
+ {
+ SOCK_ADDR_TEST_CONNECT,
+ "connectun",
+ connectun_prog_load,
+ connectun_prog_destroy,
+ AF_UNIX,
+ SOCK_STREAM,
+ SERVUN_ADDRESS,
+ 0,
+ SERVUN_REWRITE_ADDRESS,
+ 0,
+ NULL,
+ },
+ {
+ SOCK_ADDR_TEST_SENDMSG,
+ "sendmsgun",
+ sendmsgun_prog_load,
+ sendmsgun_prog_destroy,
+ AF_UNIX,
+ SOCK_DGRAM,
+ SERVUN_ADDRESS,
+ 0,
+ SERVUN_REWRITE_ADDRESS,
+ 0,
+ NULL,
+ },
+ {
+ SOCK_ADDR_TEST_RECVMSG,
+ "recvmsgun",
+ recvmsgun_prog_load,
+ recvmsgun_prog_destroy,
+ AF_UNIX,
+ SOCK_DGRAM,
+ SERVUN_REWRITE_ADDRESS,
+ 0,
+ SERVUN_REWRITE_ADDRESS,
+ 0,
+ SERVUN_ADDRESS,
+ },
+};
+
+typedef int (*info_fn)(int, struct sockaddr *, socklen_t *);
+
+static int cmp_addr(const struct sockaddr_storage *addr1, socklen_t addr1_len,
+ const struct sockaddr_storage *addr2, socklen_t addr2_len,
+ bool cmp_port)
+{
+ const struct sockaddr_in *four1, *four2;
+ const struct sockaddr_in6 *six1, *six2;
+ const struct sockaddr_un *un1, *un2;
+
+ if (addr1->ss_family != addr2->ss_family)
+ return -1;
+
+ if (addr1_len != addr2_len)
+ return -1;
+
+ if (addr1->ss_family == AF_INET) {
+ four1 = (const struct sockaddr_in *)addr1;
+ four2 = (const struct sockaddr_in *)addr2;
+ return !((four1->sin_port == four2->sin_port || !cmp_port) &&
+ four1->sin_addr.s_addr == four2->sin_addr.s_addr);
+ } else if (addr1->ss_family == AF_INET6) {
+ six1 = (const struct sockaddr_in6 *)addr1;
+ six2 = (const struct sockaddr_in6 *)addr2;
+ return !((six1->sin6_port == six2->sin6_port || !cmp_port) &&
+ !memcmp(&six1->sin6_addr, &six2->sin6_addr,
+ sizeof(struct in6_addr)));
+ } else if (addr1->ss_family == AF_UNIX) {
+ un1 = (const struct sockaddr_un *)addr1;
+ un2 = (const struct sockaddr_un *)addr2;
+ return memcmp(un1, un2, addr1_len);
+ }
+
+ return -1;
+}
+
+static int cmp_sock_addr(info_fn fn, int sock1,
+ const struct sockaddr_storage *addr2,
+ socklen_t addr2_len, bool cmp_port)
+{
+ struct sockaddr_storage addr1;
+ socklen_t len1 = sizeof(addr1);
+
+ memset(&addr1, 0, len1);
+ if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0)
+ return -1;
+
+ return cmp_addr(&addr1, len1, addr2, addr2_len, cmp_port);
+}
+
+static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2,
+ socklen_t addr2_len, bool cmp_port)
+{
+ return cmp_sock_addr(getsockname, sock1, addr2, addr2_len, cmp_port);
+}
+
+static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2,
+ socklen_t addr2_len, bool cmp_port)
+{
+ return cmp_sock_addr(getpeername, sock1, addr2, addr2_len, cmp_port);
+}
+
+static void test_bind(struct sock_addr_test *test)
+{
+ struct sockaddr_storage expected_addr;
+ socklen_t expected_addr_len = sizeof(struct sockaddr_storage);
+ int serv = -1, client = -1, err;
+
+ serv = start_server(test->socket_family, test->socket_type,
+ test->requested_addr, test->requested_port, 0);
+ if (!ASSERT_GE(serv, 0, "start_server"))
+ goto cleanup;
+
+ err = make_sockaddr(test->socket_family,
+ test->expected_addr, test->expected_port,
+ &expected_addr, &expected_addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+
+ err = cmp_local_addr(serv, &expected_addr, expected_addr_len, true);
+ if (!ASSERT_EQ(err, 0, "cmp_local_addr"))
+ goto cleanup;
+
+ /* Try to connect to server just in case */
+ client = connect_to_addr(&expected_addr, expected_addr_len, test->socket_type);
+ if (!ASSERT_GE(client, 0, "connect_to_addr"))
+ goto cleanup;
+
+cleanup:
+ if (client != -1)
+ close(client);
+ if (serv != -1)
+ close(serv);
+}
+
+static void test_connect(struct sock_addr_test *test)
+{
+ struct sockaddr_storage addr, expected_addr, expected_src_addr;
+ socklen_t addr_len = sizeof(struct sockaddr_storage),
+ expected_addr_len = sizeof(struct sockaddr_storage),
+ expected_src_addr_len = sizeof(struct sockaddr_storage);
+ int serv = -1, client = -1, err;
+
+ serv = start_server(test->socket_family, test->socket_type,
+ test->expected_addr, test->expected_port, 0);
+ if (!ASSERT_GE(serv, 0, "start_server"))
+ goto cleanup;
+
+ err = make_sockaddr(test->socket_family, test->requested_addr, test->requested_port,
+ &addr, &addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+
+ client = connect_to_addr(&addr, addr_len, test->socket_type);
+ if (!ASSERT_GE(client, 0, "connect_to_addr"))
+ goto cleanup;
+
+ err = make_sockaddr(test->socket_family, test->expected_addr, test->expected_port,
+ &expected_addr, &expected_addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+
+ if (test->expected_src_addr) {
+ err = make_sockaddr(test->socket_family, test->expected_src_addr, 0,
+ &expected_src_addr, &expected_src_addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+ }
+
+ err = cmp_peer_addr(client, &expected_addr, expected_addr_len, true);
+ if (!ASSERT_EQ(err, 0, "cmp_peer_addr"))
+ goto cleanup;
+
+ if (test->expected_src_addr) {
+ err = cmp_local_addr(client, &expected_src_addr, expected_src_addr_len, false);
+ if (!ASSERT_EQ(err, 0, "cmp_local_addr"))
+ goto cleanup;
+ }
+cleanup:
+ if (client != -1)
+ close(client);
+ if (serv != -1)
+ close(serv);
+}
+
+static void test_xmsg(struct sock_addr_test *test)
+{
+ struct sockaddr_storage addr, src_addr;
+ socklen_t addr_len = sizeof(struct sockaddr_storage),
+ src_addr_len = sizeof(struct sockaddr_storage);
+ struct msghdr hdr;
+ struct iovec iov;
+ char data = 'a';
+ int serv = -1, client = -1, err;
+
+ /* Unlike the other tests, here we test that we can rewrite the src addr
+ * with a recvmsg() hook.
+ */
+
+ serv = start_server(test->socket_family, test->socket_type,
+ test->expected_addr, test->expected_port, 0);
+ if (!ASSERT_GE(serv, 0, "start_server"))
+ goto cleanup;
+
+ client = socket(test->socket_family, test->socket_type, 0);
+ if (!ASSERT_GE(client, 0, "socket"))
+ goto cleanup;
+
+ /* AF_UNIX sockets have to be bound to something to trigger the recvmsg bpf program. */
+ if (test->socket_family == AF_UNIX) {
+ err = make_sockaddr(AF_UNIX, SRCUN_ADDRESS, 0, &src_addr, &src_addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+
+ err = bind(client, (const struct sockaddr *) &src_addr, src_addr_len);
+ if (!ASSERT_OK(err, "bind"))
+ goto cleanup;
+ }
+
+ err = make_sockaddr(test->socket_family, test->requested_addr, test->requested_port,
+ &addr, &addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = &data;
+ iov.iov_len = sizeof(data);
+
+ memset(&hdr, 0, sizeof(hdr));
+ hdr.msg_name = (void *)&addr;
+ hdr.msg_namelen = addr_len;
+ hdr.msg_iov = &iov;
+ hdr.msg_iovlen = 1;
+
+ err = sendmsg(client, &hdr, 0);
+ if (!ASSERT_EQ(err, sizeof(data), "sendto"))
+ goto cleanup;
+
+ addr_len = src_addr_len = sizeof(struct sockaddr_storage);
+
+ err = recvfrom(serv, &data, sizeof(data), 0, (struct sockaddr *) &src_addr, &src_addr_len);
+ if (!ASSERT_EQ(err, sizeof(data), "recvfrom"))
+ goto cleanup;
+
+ ASSERT_EQ(data, 'a', "data mismatch");
+
+ if (test->expected_src_addr) {
+ err = make_sockaddr(test->socket_family, test->expected_src_addr, 0,
+ &addr, &addr_len);
+ if (!ASSERT_EQ(err, 0, "make_sockaddr"))
+ goto cleanup;
+
+ err = cmp_addr(&src_addr, src_addr_len, &addr, addr_len, false);
+ if (!ASSERT_EQ(err, 0, "cmp_addr"))
+ goto cleanup;
+ }
+
+cleanup:
+ if (client != -1)
+ close(client);
+ if (serv != -1)
+ close(serv);
+}
+
+void test_sock_addr(void)
+{
+ int cgroup_fd = -1;
+ void *skel;
+
+ cgroup_fd = test__join_cgroup("/sock_addr");
+ if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup"))
+ goto cleanup;
+
+ for (size_t i = 0; i < ARRAY_SIZE(tests); ++i) {
+ struct sock_addr_test *test = &tests[i];
+
+ if (!test__start_subtest(test->name))
+ continue;
+
+ skel = test->loadfn(cgroup_fd);
+ if (!skel)
+ continue;
+
+ switch (test->type) {
+ case SOCK_ADDR_TEST_BIND:
+ test_bind(test);
+ break;
+ case SOCK_ADDR_TEST_CONNECT:
+ test_connect(test);
+ break;
+ case SOCK_ADDR_TEST_SENDMSG:
+ case SOCK_ADDR_TEST_RECVMSG:
+ test_xmsg(test);
+ break;
+ default:
+ ASSERT_TRUE(false, "Unknown sock addr test type");
+ break;
+ }
+
+ test->destroyfn(skel);
+ }
+
+cleanup:
+ if (cgroup_fd >= 0)
+ close(cgroup_fd);
+}
diff --git a/tools/testing/selftests/bpf/progs/bindun_prog.c b/tools/testing/selftests/bpf/progs/bindun_prog.c
new file mode 100644
index 000000000000..c7bc93d5a904
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bindun_prog.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
+
+#include "vmlinux.h"
+
+#include <string.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_kfuncs.h"
+
+__u8 SERVUN_REWRITE_ADDRESS[] = "\0bpf_cgroup_unix_test_rewrite";
+
+SEC("cgroup/bindun")
+int bindun_prog(struct bpf_sock_addr *ctx)
+{
+ struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx);
+ struct sockaddr_un *sa_kern_unaddr;
+ __u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) +
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1;
+ int ret;
+
+ ret = bpf_sock_addr_set_unix_addr(sa_kern, SERVUN_REWRITE_ADDRESS,
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1);
+ if (ret)
+ return 0;
+
+ if (sa_kern->uaddrlen != unaddrlen)
+ return 0;
+
+ sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
+ bpf_core_type_id_kernel(struct sockaddr_un));
+ if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
+ return 0;
+
+ return 1;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/connectun_prog.c b/tools/testing/selftests/bpf/progs/connectun_prog.c
new file mode 100644
index 000000000000..8ab5b5d1fc3b
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/connectun_prog.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
+
+#include "vmlinux.h"
+
+#include <string.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_kfuncs.h"
+
+__u8 SERVUN_REWRITE_ADDRESS[] = "\0bpf_cgroup_unix_test_rewrite";
+
+SEC("cgroup/connectun")
+int connectun_prog(struct bpf_sock_addr *ctx)
+{
+ struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx);
+ struct sockaddr_un *sa_kern_unaddr;
+ __u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) +
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1;
+ int ret;
+
+ /* Rewrite destination. */
+ ret = bpf_sock_addr_set_unix_addr(sa_kern, SERVUN_REWRITE_ADDRESS,
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1);
+ if (ret)
+ return 0;
+
+ if (sa_kern->uaddrlen != unaddrlen)
+ return 0;
+
+ sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
+ bpf_core_type_id_kernel(struct sockaddr_un));
+ if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
+ return 0;
+
+ return 1;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/recvmsgun_prog.c b/tools/testing/selftests/bpf/progs/recvmsgun_prog.c
new file mode 100644
index 000000000000..2baeaebac57e
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/recvmsgun_prog.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
+
+#include "vmlinux.h"
+
+#include <string.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_kfuncs.h"
+
+__u8 SERVUN_ADDRESS[] = "\0bpf_cgroup_unix_test";
+
+SEC("cgroup/recvmsgun")
+int recvmsgun_prog(struct bpf_sock_addr *ctx)
+{
+ struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx);
+ struct sockaddr_un *sa_kern_unaddr;
+ __u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) +
+ sizeof(SERVUN_ADDRESS) - 1;
+ int ret;
+
+ ret = bpf_sock_addr_set_unix_addr(sa_kern, SERVUN_ADDRESS,
+ sizeof(SERVUN_ADDRESS) - 1);
+ if (ret)
+ return 1;
+
+ if (sa_kern->uaddrlen != unaddrlen)
+ return 1;
+
+ sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
+ bpf_core_type_id_kernel(struct sockaddr_un));
+ if (memcmp(sa_kern_unaddr->sun_path, SERVUN_ADDRESS,
+ sizeof(SERVUN_ADDRESS) - 1) != 0)
+ return 1;
+
+ return 1;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/sendmsgun_prog.c b/tools/testing/selftests/bpf/progs/sendmsgun_prog.c
new file mode 100644
index 000000000000..23f2135c6eb0
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/sendmsgun_prog.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
+
+#include "vmlinux.h"
+
+#include <string.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_kfuncs.h"
+
+__u8 SERVUN_REWRITE_ADDRESS[] = "\0bpf_cgroup_unix_test_rewrite";
+
+SEC("cgroup/sendmsgun")
+int sendmsgun_prog(struct bpf_sock_addr *ctx)
+{
+ struct bpf_sock_addr_kern *sa_kern = bpf_cast_to_kern_ctx(ctx);
+ struct sockaddr_un *sa_kern_unaddr;
+ __u32 unaddrlen = offsetof(struct sockaddr_un, sun_path) +
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1;
+ int ret;
+
+ /* Rewrite destination. */
+ ret = bpf_sock_addr_set_unix_addr(sa_kern, SERVUN_REWRITE_ADDRESS,
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1);
+ if (ret)
+ return 0;
+
+ if (sa_kern->uaddrlen != unaddrlen)
+ return 0;
+
+ sa_kern_unaddr = bpf_rdonly_cast(sa_kern->uaddr,
+ bpf_core_type_id_kernel(struct sockaddr_un));
+ if (memcmp(sa_kern_unaddr->sun_path, SERVUN_REWRITE_ADDRESS,
+ sizeof(SERVUN_REWRITE_ADDRESS) - 1) != 0)
+ return 0;
+
+ return 1;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.41.0
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