Test redirection logic.
BPF_MAP_TYPE_SOCKMAP
BPF_MAP_TYPE_SOCKHASH
✕
sk_msg-to-egress
sk_msg-to-ingress
sk_skb-to-egress
sk_skb-to-ingress
✕
AF_INET, SOCK_STREAM
AF_INET6, SOCK_STREAM
AF_INET, SOCK_DGRAM
AF_INET6, SOCK_DGRAM
AF_UNIX, SOCK_STREAM
AF_UNIX, SOCK_DGRAM
AF_VSOCK, SOCK_STREAM
AF_VSOCK, SOCK_SEQPACKET
Suggested-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
Signed-off-by: Michal Luczaj <mhal@xxxxxxx>
---
.../bpf/prog_tests/sockmap_helpers.h | 58 ++++
.../selftests/bpf/prog_tests/sockmap_redir.c | 315 ++++++++++++++++++
2 files changed, 373 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/sockmap_redir.c
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h b/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
index c50efa834a11..db0a7b4dc8be 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
@@ -16,6 +16,9 @@
#define VMADDR_CID_LOCAL 1
#endif
+#define u32(v) ((u32){(v)})
+#define u64(v) ((u64){(v)})
+
#define __always_unused __attribute__((__unused__))
/* include/linux/cleanup.h */
@@ -485,4 +488,59 @@ static inline int create_socket_pairs(int family, int sotype, int *c0, int *c1,
return err;
}
+static inline const char *socket_kind_to_str(int sock_fd)
+{
+ int domain = 0, type = 0;
+ socklen_t opt_len;
+
+ opt_len = sizeof(domain);
+ if (getsockopt(sock_fd, SOL_SOCKET, SO_DOMAIN, &domain, &opt_len))
+ FAIL_ERRNO("getsockopt(SO_DOMAIN)");
+
+ opt_len = sizeof(type);
+ if (getsockopt(sock_fd, SOL_SOCKET, SO_TYPE, &type, &opt_len))
+ FAIL_ERRNO("getsockopt(SO_TYPE)");
+
+ switch (domain) {
+ case AF_INET:
+ switch (type) {
+ case SOCK_STREAM:
+ return "tcp4";
+ case SOCK_DGRAM:
+ return "udp4";
+ }
+ break;
+ case AF_INET6:
+ switch (type) {
+ case SOCK_STREAM:
+ return "tcp6";
+ case SOCK_DGRAM:
+ return "udp6";
+ }
+ break;
+ case AF_UNIX:
+ switch (type) {
+ case SOCK_STREAM:
+ return "u_str";
+ case SOCK_DGRAM:
+ return "u_dgr";
+ case SOCK_SEQPACKET:
+ return "u_seq";
+ }
+ break;
+ case AF_VSOCK:
+ switch (type) {
+ case SOCK_STREAM:
+ return "v_str";
+ case SOCK_DGRAM:
+ return "v_dgr";
+ case SOCK_SEQPACKET:
+ return "v_seq";
+ }
+ break;
+ }
+
+ return "???";
+}
+
#endif // __SOCKMAP_HELPERS__
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c b/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c
new file mode 100644
index 000000000000..335dd348b019
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c
@@ -0,0 +1,315 @@
+#include <stdio.h>
+#include <errno.h>
+#include <error.h>
+#include <sys/types.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <linux/vm_sockets.h>
+
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#include "test_progs.h"
+#include "sockmap_helpers.h"
+#include "test_sockmap_listen.skel.h"
+
+enum prog_kind {
+ SK_MSG_EGRESS,
+ SK_MSG_INGRESS,
+ SK_SKB_EGRESS,
+ SK_SKB_INGRESS,
+};
+
+struct {
+ enum prog_kind prog_kind;
+ const char *in, *out;
+} supported[] = {
+ /* Send to local: TCP -> any but vsock */
+ { SK_MSG_INGRESS, "tcp", "tcp" },
+ { SK_MSG_INGRESS, "tcp", "udp" },
+ { SK_MSG_INGRESS, "tcp", "u_str" },
+ { SK_MSG_INGRESS, "tcp", "u_dgr" },
+ /* Send to egress: TCP -> TCP */
+ { SK_MSG_EGRESS, "tcp", "tcp" },
+ /* Ingress to egress: any -> any */
+ { SK_SKB_EGRESS, "any", "any" },
+ /* Ingress to local: any -> any but vsock */
+ { SK_SKB_INGRESS, "any", "tcp" },
+ { SK_SKB_INGRESS, "any", "udp" },
+ { SK_SKB_INGRESS, "any", "u_str" },
+ { SK_SKB_INGRESS, "any", "u_dgr" },
+};
+
+enum {
+ SEND_INNER = 0,
+ SEND_OUTER,
+};
+
+enum {
+ RECV_INNER = 0,
+ RECV_OUTER,
+};
+
+enum map_kind {
+ SOCKMAP,
+ SOCKHASH,
+};
+
+struct redir_spec {
+ const char *name;
+ int idx_send;
+ int idx_recv;
+ enum prog_kind prog_kind;
+};
+
+struct socket_spec {
+ int family;
+ int sotype;
+ int send_flags;
+ int in[2];
+ int out[2];
+};
+
+static int socket_spec_pairs(struct socket_spec *s)
+{
+ return create_socket_pairs(s->family, s->sotype,
+ &s->in[0], &s->out[0],
+ &s->in[1], &s->out[1]);
+}
+
+static void socket_spec_close(struct socket_spec *s)
+{
+ xclose(s->in[0]);
+ xclose(s->in[1]);
+ xclose(s->out[0]);
+ xclose(s->out[1]);
+}
+
+static void get_redir_params(struct redir_spec *redir,
+ struct test_sockmap_listen *skel,
+ int *prog_fd, enum bpf_attach_type *attach_type,
+ bool *ingress_flag)
+{
+ enum prog_kind kind = redir->prog_kind;
+ struct bpf_program *prog;
+ bool sk_msg;
+
+ sk_msg = kind == SK_MSG_INGRESS || kind == SK_MSG_EGRESS;
+ prog = sk_msg ? skel->progs.prog_msg_verdict : skel->progs.prog_skb_verdict;
+
+ *prog_fd = bpf_program__fd(prog);
+ *attach_type = sk_msg ? BPF_SK_MSG_VERDICT : BPF_SK_SKB_VERDICT;
+ *ingress_flag = kind == SK_MSG_INGRESS || kind == SK_SKB_INGRESS;
+}
+
+static void test_send_redir_recv(int sd_send, int send_flags, int sd_in,
+ int sd_out, int sd_recv, int map_in, int map_out)
+{
+ char *send_buf = "ab";
+ char recv_buf = '\0';
+ ssize_t n, len = 1;
+
+ if (xbpf_map_update_elem(map_in, &u32(0), &u64(sd_in), BPF_NOEXIST))
+ return;
+
+ if (xbpf_map_update_elem(map_out, &u32(0), &u64(sd_out), BPF_NOEXIST))
+ goto del_in;
+
+ /* Last byte is OOB data when send_flags has MSG_OOB bit set */
+ if (send_flags & MSG_OOB)
+ len++;
+ n = send(sd_send, send_buf, len, send_flags);
+ if (n >= 0 && n < len)
+ FAIL("incomplete send");
+ if (n < len && errno != EACCES) {
+ FAIL_ERRNO("send");
+ goto out;
+ }
+
+ /* sk_msg redirect combo not supported */
+ if (errno == EACCES) {
+ test__skip();
+ goto out;
+ }
+
+ n = recv_timeout(sd_recv, &recv_buf, 1, 0, IO_TIMEOUT_SEC);
+ if (n != 1) {
+ FAIL_ERRNO("recv");
+ goto out;
+ }
+ if (recv_buf != send_buf[0])
+ FAIL("recv: payload check, %02x != %02x", recv_buf, send_buf[0]);
+
+ if (send_flags & MSG_OOB) {
+ /* Check that we can't read OOB while in sockmap */
+ errno = 0;
+ n = recv(sd_out, &recv_buf, 1, MSG_OOB | MSG_DONTWAIT);
+ if (n != -1)
+ FAIL("recv(MSG_OOB): expected failure: retval=%zd errno=%d",
+ n, errno);
+
+ /* Remove sd_out from sockmap */
+ xbpf_map_delete_elem(map_out, &u32(0));
+
+ /* Check that OOB was dropped on redirect */
+ errno = 0;
+ n = recv(sd_out, &recv_buf, 1, MSG_OOB | MSG_DONTWAIT);
+ if (n != -1)
+ FAIL("recv(MSG_OOB): expected failure: retval=%zd errno=%d",
+ n, errno);
+
+ goto del_in;
+ }
+out:
+ xbpf_map_delete_elem(map_out, &u32(0));
+del_in:
+ xbpf_map_delete_elem(map_in, &u32(0));
+}
+
+static bool is_supported(enum prog_kind prog_kind, const char *in, const char *out)
+{
+ for (int i = 0; i < ARRAY_SIZE(supported); ++i) {
+ if (supported[i].prog_kind == prog_kind &&
+ (!strcmp(supported[i].in, "any") || strstr(in, supported[i].in)) &&
+ (!strcmp(supported[i].out, "any") || strstr(out, supported[i].out)))
+ return true;
+ }
+
+ return false;
+}
+
+static void test_socket(enum map_kind map_kind, struct redir_spec *redir,
+ int map_in, int map_out, struct socket_spec *s_in,
+ struct socket_spec *s_out)
+{
+ int fd_in, fd_out, fd_send, fd_recv, send_flags;
+ const char *in_str, *out_str;
+ char s[MAX_TEST_NAME];
+
+ fd_in = s_in->in[0];
+ fd_out = s_out->out[0];
+ fd_send = s_in->in[redir->idx_send];
+ fd_recv = s_out->out[redir->idx_recv];
+ send_flags = s_in->send_flags;
+
+ in_str = socket_kind_to_str(fd_in);
+ out_str = socket_kind_to_str(fd_out);
+
+ snprintf(s, sizeof(s),
+ "%-4s %-17s %-5s → %-5s%6s",
+ /* hash sk_skb-to-ingress u_str → v_str (OOB) */
+ map_kind == SOCKMAP ? "map" : "hash",
+ redir->name,
+ in_str,
+ out_str,
+ send_flags & MSG_OOB ? "(OOB)" : "");
+
+ if (!test__start_subtest(s))
+ return;
+
+ if (!is_supported(redir->prog_kind, in_str, out_str)) {
+ test__skip();
+ return;
+ }
+
+ test_send_redir_recv(fd_send, send_flags, fd_in, fd_out, fd_recv,
+ map_in, map_out);
+}
+
+static void test_redir(enum map_kind map_kind, struct redir_spec *redir,
+ int map_in, int map_out)
+{
+ struct socket_spec *s, sockets[] = {
+ { AF_INET, SOCK_STREAM },
+ // { AF_INET, SOCK_STREAM, MSG_OOB }, /* Known to be broken */
+ { AF_INET6, SOCK_STREAM },
+ { AF_INET, SOCK_DGRAM },
+ { AF_INET6, SOCK_DGRAM },
+ { AF_UNIX, SOCK_STREAM },
+ { AF_UNIX, SOCK_STREAM, MSG_OOB },
+ { AF_UNIX, SOCK_DGRAM },
+ // { AF_UNIX, SOCK_SEQPACKET}, /* Not supported */
+ { AF_VSOCK, SOCK_STREAM },
+ // { AF_VSOCK, SOCK_DGRAM }, /* Not supported */
+ { AF_VSOCK, SOCK_SEQPACKET },
+ };
+
+ for (s = sockets; s < sockets + ARRAY_SIZE(sockets); s++)
+ if (socket_spec_pairs(s))
+ goto out;
+
+ /* Intra-proto */
+ for (s = sockets; s < sockets + ARRAY_SIZE(sockets); s++)
+ test_socket(map_kind, redir, map_in, map_out, s, s);
+
+ /* Cross-proto */
+ for (int i = 0; i < ARRAY_SIZE(sockets); i++) {
+ for (int j = 0; j < ARRAY_SIZE(sockets); j++) {
+ struct socket_spec *in = &sockets[i];
+ struct socket_spec *out = &sockets[j];
+
+ /* Skip intra-proto and between variants */
+ if (out->send_flags ||
+ (in->family == out->family &&
+ in->sotype == out->sotype))
+ continue;
+
+ test_socket(map_kind, redir, map_in, map_out, in, out);
+ }
+ }
+out:
+ while (--s >= sockets)
+ socket_spec_close(s);
+}
+
+static void test_map(enum map_kind map_kind)
+{
+ struct redir_spec *r, redirs[] = {
+ { "sk_msg-to-egress", SEND_INNER, RECV_OUTER, SK_MSG_EGRESS },
+ { "sk_msg-to-ingress", SEND_INNER, RECV_INNER, SK_MSG_INGRESS },
+ { "sk_skb-to-egress", SEND_OUTER, RECV_OUTER, SK_SKB_EGRESS },
+ { "sk_skb-to-ingress", SEND_OUTER, RECV_INNER, SK_SKB_INGRESS },
+ };
+
+ for (r = redirs; r < redirs + ARRAY_SIZE(redirs); r++) {
+ struct test_sockmap_listen *skel;
+ enum bpf_attach_type attach_type;
+ int prog, map_in, map_out;
+
+ skel = test_sockmap_listen__open_and_load();
+ if (!skel) {
+ FAIL("open_and_load");
+ return;
+ }
+
+ if (map_kind == SOCKMAP) {
+ skel->bss->test_sockmap = true;
+ map_out = bpf_map__fd(skel->maps.sock_map);
+ } else {
+ skel->bss->test_sockmap = false;
+ map_out = bpf_map__fd(skel->maps.sock_hash);
+ }
+
+ map_in = bpf_map__fd(skel->maps.nop_map);
+ get_redir_params(r, skel, &prog, &attach_type,
+ &skel->bss->test_ingress);
+
+ if (xbpf_prog_attach(prog, map_in, attach_type, 0))
+ return;
+
+ test_redir(map_kind, r, map_in, map_out);
+
+ if (xbpf_prog_detach2(prog, map_in, attach_type))
+ return;
+
+ test_sockmap_listen__destroy(skel);
+ }
+}
+
+void serial_test_sockmap_redir(void)
+{
+ test_map(SOCKMAP);
+ test_map(SOCKHASH);
+}
--
2.46.0
