bpf: selftests add sockmap tests

This generates a set of sockets, attaches BPF programs, and sends some
simple traffic using basic send/recv pattern. Additionally, we do a bunch
of negative tests to ensure adding/removing socks out of the sockmap fail
correctly.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/lib/bpf/libbpf.c

@@ -1744,3 +1744,32 @@ long libbpf_get_error(const void *ptr)
 		return PTR_ERR(ptr);
 	return 0;
 }
+
+int bpf_prog_load(const char *file, enum bpf_prog_type type,
+		  struct bpf_object **pobj, int *prog_fd)
+{
+	struct bpf_program *prog;
+	struct bpf_object *obj;
+	int err;
+
+	obj = bpf_object__open(file);
+	if (IS_ERR(obj))
+		return -ENOENT;
+
+	prog = bpf_program__next(NULL, obj);
+	if (!prog) {
+		bpf_object__close(obj);
+		return -ENOENT;
+	}
+
+	bpf_program__set_type(prog, type);
+	err = bpf_object__load(obj);
+	if (err) {
+		bpf_object__close(obj);
+		return -EINVAL;
+	}
+
+	*pobj = obj;
+	*prog_fd = bpf_program__fd(prog);
+	return 0;
+}

tools/lib/bpf/libbpf.h

@@ -243,4 +243,6 @@ int bpf_map__pin(struct bpf_map *map, const char *path);
 
 long libbpf_get_error(const void *ptr);
 
+int bpf_prog_load(const char *file, enum bpf_prog_type type,
+		  struct bpf_object **pobj, int *prog_fd);
 #endif

tools/testing/selftests/bpf/Makefile

@@ -15,7 +15,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
 	test_align
 
 TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
-	test_pkt_md_access.o test_xdp_redirect.o
+	test_pkt_md_access.o test_xdp_redirect.o sockmap_parse_prog.o sockmap_verdict_prog.o
 
 TEST_PROGS := test_kmod.sh test_xdp_redirect.sh
 

tools/testing/selftests/bpf/sockmap_parse_prog.c

+#include <linux/bpf.h>
+#include "bpf_helpers.h"
+#include "bpf_util.h"
+#include "bpf_endian.h"
+
+int _version SEC("version") = 1;
+
+#define bpf_printk(fmt, ...)					\
+({								\
+	       char ____fmt[] = fmt;				\
+	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
+				##__VA_ARGS__);			\
+})
+
+SEC("sk_skb1")
+int bpf_prog1(struct __sk_buff *skb)
+{
+	void *data_end = (void *)(long) skb->data_end;
+	void *data = (void *)(long) skb->data;
+	__u32 lport = skb->local_port;
+	__u32 rport = skb->remote_port;
+	char *d = data;
+
+	if (data + 8 > data_end)
+		return skb->len;
+
+	/* This write/read is a bit pointless but tests the verifier and
+	 * strparser handler for read/write pkt data and access into sk
+	 * fields.
+	 */
+	d[0] = 1;
+
+	bpf_printk("data[0] = (%u): local_port %i remote %i\n",
+		   d[0], lport, bpf_ntohl(rport));
+	return skb->len;
+}
+
+char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/sockmap_verdict_prog.c

+#include <linux/bpf.h>
+#include "bpf_helpers.h"
+#include "bpf_util.h"
+#include "bpf_endian.h"
+
+int _version SEC("version") = 1;
+
+#define bpf_printk(fmt, ...)					\
+({								\
+	       char ____fmt[] = fmt;				\
+	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
+				##__VA_ARGS__);			\
+})
+
+struct bpf_map_def SEC("maps") sock_map = {
+	.type = BPF_MAP_TYPE_SOCKMAP,
+	.key_size = sizeof(int),
+	.value_size = sizeof(int),
+	.max_entries = 20,
+};
+
+SEC("sk_skb2")
+int bpf_prog2(struct __sk_buff *skb)
+{
+	void *data_end = (void *)(long) skb->data_end;
+	void *data = (void *)(long) skb->data;
+	__u32 lport = skb->local_port;
+	__u32 rport = skb->remote_port;
+	char *d = data;
+
+	if (data + 8 > data_end)
+		return SK_DROP;
+
+	d[0] = 0xd;
+	d[1] = 0xe;
+	d[2] = 0xa;
+	d[3] = 0xd;
+	d[4] = 0xb;
+	d[5] = 0xe;
+	d[6] = 0xe;
+	d[7] = 0xf;
+
+	bpf_printk("data[0] = (%u): local_port %i remote %i\n",
+		   d[0], lport, bpf_ntohl(rport));
+	return bpf_sk_redirect_map(&sock_map, 5, 0);
+}
+
+char _license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/test_maps.c

@@ -22,6 +22,7 @@
 #include <linux/bpf.h>
 
 #include <bpf/bpf.h>
+#include <bpf/libbpf.h>
 #include "bpf_util.h"
 
 static int map_flags;
@@ -453,6 +454,312 @@ static void test_devmap(int task, void *data)
 	close(fd);
 }
 
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <sys/select.h>
+#include <linux/err.h>
+#define SOCKMAP_PARSE_PROG "./sockmap_parse_prog.o"
+#define SOCKMAP_VERDICT_PROG "./sockmap_verdict_prog.o"
+static void test_sockmap(int task, void *data)
+{
+	int ports[] = {50200, 50201, 50202, 50204};
+	int err, i, fd, sfd[6] = {0xdeadbeef};
+	char buf[] = "hello sockmap user\n";
+	int one = 1, map_fd, s, sc, rc;
+	int parse_prog, verdict_prog;
+	struct bpf_map *bpf_map;
+	struct sockaddr_in addr;
+	struct bpf_object *obj;
+	struct timeval to;
+	__u32 key, value;
+	fd_set w;
+
+	/* Create some sockets to use with sockmap */
+	for (i = 0; i < 2; i++) {
+		sfd[i] = socket(AF_INET, SOCK_STREAM, 0);
+		if (sfd[i] < 0)
+			goto out;
+		err = setsockopt(sfd[i], SOL_SOCKET, SO_REUSEADDR,
+				 (char *)&one, sizeof(one));
+		if (err) {
+			printf("failed to setsockopt\n");
+			goto out;
+		}
+		err = ioctl(sfd[i], FIONBIO, (char *)&one);
+		if (err < 0) {
+			printf("failed to ioctl\n");
+			goto out;
+		}
+		memset(&addr, 0, sizeof(struct sockaddr_in));
+		addr.sin_family = AF_INET;
+		addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+		addr.sin_port = htons(ports[i]);
+		err = bind(sfd[i], (struct sockaddr *)&addr, sizeof(addr));
+		if (err < 0) {
+			printf("failed to bind: err %i: %i:%i\n",
+			       err, i, sfd[i]);
+			goto out;
+		}
+		err = listen(sfd[i], 32);
+		if (err < 0) {
+			printf("failed to listeen\n");
+			goto out;
+		}
+	}
+
+	for (i = 2; i < 4; i++) {
+		sfd[i] = socket(AF_INET, SOCK_STREAM, 0);
+		if (sfd[i] < 0)
+			goto out;
+		err = setsockopt(sfd[i], SOL_SOCKET, SO_REUSEADDR,
+				 (char *)&one, sizeof(one));
+		if (err) {
+			printf("set sock opt\n");
+			goto out;
+		}
+		memset(&addr, 0, sizeof(struct sockaddr_in));
+		addr.sin_family = AF_INET;
+		addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+		addr.sin_port = htons(ports[i - 2]);
+		err = connect(sfd[i], (struct sockaddr *)&addr, sizeof(addr));
+		if (err) {
+			printf("failed to conenct\n");
+			goto out;
+		}
+	}
+
+
+	for (i = 4; i < 6; i++) {
+		sfd[i] = accept(sfd[i - 4], NULL, NULL);
+		if (sfd[i] < 0) {
+			printf("accept failed\n");
+			goto out;
+		}
+	}
+
+	/* Test sockmap with connected sockets */
+	fd = bpf_create_map(BPF_MAP_TYPE_SOCKMAP,
+			    sizeof(key), sizeof(value),
+			    6, 0);
+	if (fd < 0) {
+		printf("Failed to create sockmap %i\n", fd);
+		goto out_sockmap;
+	}
+
+	/* Nothing attached so these should fail */
+	for (i = 0; i < 6; i++) {
+		err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
+		if (!err) {
+			printf("Failed invalid update sockmap '%i:%i'\n",
+			       i, sfd[i]);
+			goto out_sockmap;
+		}
+	}
+
+	/* Test attaching bad fds */
+	err = __bpf_prog_attach(-1, -2, fd, BPF_CGROUP_SMAP_INGRESS, 0);
+	if (!err) {
+		printf("Failed invalid prog attach\n");
+		goto out_sockmap;
+	}
+
+	/* Load SK_SKB program and Attach */
+	err = bpf_prog_load(SOCKMAP_PARSE_PROG,
+			    BPF_PROG_TYPE_SK_SKB, &obj, &parse_prog);
+	if (err) {
+		printf("Failed to load SK_SKB parse prog\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_prog_load(SOCKMAP_VERDICT_PROG,
+			    BPF_PROG_TYPE_SK_SKB, &obj, &verdict_prog);
+	if (err) {
+		printf("Failed to load SK_SKB verdict prog\n");
+		goto out_sockmap;
+	}
+
+	bpf_map = bpf_object__find_map_by_name(obj, "sock_map");
+	if (IS_ERR(bpf_map)) {
+		printf("Failed to load map from verdict prog\n");
+		goto out_sockmap;
+	}
+
+	map_fd = bpf_map__fd(bpf_map);
+	if (map_fd < 0) {
+		printf("Failed to get map fd\n");
+		goto out_sockmap;
+	}
+
+	err = __bpf_prog_attach(parse_prog, verdict_prog, map_fd,
+				BPF_CGROUP_SMAP_INGRESS, 0);
+	if (err) {
+		printf("Failed bpf prog attach\n");
+		goto out_sockmap;
+	}
+
+	/* Test map update elem */
+	for (i = 0; i < 6; i++) {
+		err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_ANY);
+		if (err) {
+			printf("Failed map_fd update sockmap %i '%i:%i'\n",
+			       err, i, sfd[i]);
+			goto out_sockmap;
+		}
+	}
+
+	/* Test map delete elem and remove send/recv sockets */
+	for (i = 2; i < 4; i++) {
+		err = bpf_map_delete_elem(map_fd, &i);
+		if (err) {
+			printf("Failed delete  sockmap %i '%i:%i'\n",
+			       err, i, sfd[i]);
+			goto out_sockmap;
+		}
+	}
+
+	/* Test map send/recv */
+	sc = send(sfd[2], buf, 10, 0);
+	if (sc < 0) {
+		printf("Failed sockmap send\n");
+		goto out_sockmap;
+	}
+
+	FD_ZERO(&w);
+	FD_SET(sfd[3], &w);
+	to.tv_sec = 1;
+	to.tv_usec = 0;
+	s = select(sfd[3] + 1, &w, NULL, NULL, &to);
+	if (s == -1) {
+		perror("Failed sockmap select()");
+		goto out_sockmap;
+	} else if (!s) {
+		printf("Failed sockmap unexpected timeout\n");
+		goto out_sockmap;
+	}
+
+	if (!FD_ISSET(sfd[3], &w)) {
+		printf("Failed sockmap select/recv\n");
+		goto out_sockmap;
+	}
+
+	rc = recv(sfd[3], buf, sizeof(buf), 0);
+	if (rc < 0) {
+		printf("Failed sockmap recv\n");
+		goto out_sockmap;
+	}
+
+	/* Delete the reset of the elems include some NULL elems */
+	for (i = 0; i < 6; i++) {
+		err = bpf_map_delete_elem(map_fd, &i);
+		if (err && (i == 0 || i == 1 || i >= 4)) {
+			printf("Failed delete  sockmap %i '%i:%i'\n",
+			       err, i, sfd[i]);
+			goto out_sockmap;
+		} else if (!err && (i == 2 || i == 3)) {
+			printf("Failed null delete sockmap %i '%i:%i'\n",
+			       err, i, sfd[i]);
+			goto out_sockmap;
+		}
+	}
+
+	/* Test having multiple SMAPs open and active on same fds */
+	err = __bpf_prog_attach(parse_prog, verdict_prog, fd,
+				BPF_CGROUP_SMAP_INGRESS, 0);
+	if (err) {
+		printf("Failed fd bpf prog attach\n");
+		goto out_sockmap;
+	}
+
+	for (i = 0; i < 6; i++) {
+		err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
+		if (err) {
+			printf("Failed fd update sockmap %i '%i:%i'\n",
+			       err, i, sfd[i]);
+			goto out_sockmap;
+		}
+	}
+
+	/* Test duplicate socket add of NOEXIST, ANY and EXIST */
+	i = 0;
+	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
+	if (!err) {
+		printf("Failed BPF_NOEXIST create\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
+	if (err) {
+		printf("Failed sockmap update BPF_ANY\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
+	if (err) {
+		printf("Failed sockmap update BPF_EXIST\n");
+		goto out_sockmap;
+	}
+
+	/* The above were pushing fd into same slot try different slot now */
+	i = 2;
+	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
+	if (!err) {
+		printf("Failed BPF_NOEXIST create\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
+	if (err) {
+		printf("Failed sockmap update BPF_ANY\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
+	if (err) {
+		printf("Failed sockmap update BPF_EXIST\n");
+		goto out_sockmap;
+	}
+
+	/* Try pushing fd into different map, this is not allowed at the
+	 * moment. Which programs would we use?
+	 */
+	err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_NOEXIST);
+	if (!err) {
+		printf("Failed BPF_NOEXIST create\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_ANY);
+	if (!err) {
+		printf("Failed sockmap update BPF_ANY\n");
+		goto out_sockmap;
+	}
+
+	err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_EXIST);
+	if (!err) {
+		printf("Failed sockmap update BPF_EXIST\n");
+		goto out_sockmap;
+	}
+
+	/* Test map close sockets */
+	for (i = 0; i < 6; i++)
+		close(sfd[i]);
+	close(fd);
+	close(map_fd);
+	bpf_object__close(obj);
+	return;
+out:
+	for (i = 0; i < 6; i++)
+		close(sfd[i]);
+	printf("Failed to create sockmap '%i:%s'!\n", i, strerror(errno));
+	exit(1);
+out_sockmap:
+	for (i = 0; i < 6; i++)
+		close(sfd[i]);
+	close(fd);
+	exit(1);
+}
+
 #define MAP_SIZE (32 * 1024)
 
 static void test_map_large(void)
@@ -621,6 +928,7 @@ static void run_all_tests(void)
 	test_arraymap_percpu_many_keys();
 
 	test_devmap(0, NULL);
+	test_sockmap(0, NULL);
 
 	test_map_large();
 	test_map_parallel();

tools/testing/selftests/bpf/test_progs.c

@@ -75,39 +75,6 @@ static struct {
 	__ret;								\
 })
 
-static int bpf_prog_load(const char *file, enum bpf_prog_type type,
-			 struct bpf_object **pobj, int *prog_fd)
-{
-	struct bpf_program *prog;
-	struct bpf_object *obj;
-	int err;
-
-	obj = bpf_object__open(file);
-	if (IS_ERR(obj)) {
-		error_cnt++;
-		return -ENOENT;
-	}
-
-	prog = bpf_program__next(NULL, obj);
-	if (!prog) {
-		bpf_object__close(obj);
-		error_cnt++;
-		return -ENOENT;
-	}
-
-	bpf_program__set_type(prog, type);
-	err = bpf_object__load(obj);
-	if (err) {
-		bpf_object__close(obj);
-		error_cnt++;
-		return -EINVAL;
-	}
-
-	*pobj = obj;
-	*prog_fd = bpf_program__fd(prog);
-	return 0;
-}
-
 static int bpf_find_map(const char *test, struct bpf_object *obj,
 			const char *name)
 {
@@ -130,8 +97,10 @@ static void test_pkt_access(void)
 	int err, prog_fd;
 
 	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
-	if (err)
+	if (err) {
+		error_cnt++;
 		return;
+	}
 
 	err = bpf_prog_test_run(prog_fd, 100000, &pkt_v4, sizeof(pkt_v4),
 				NULL, NULL, &retval, &duration);
@@ -162,8 +131,10 @@ static void test_xdp(void)
 	int err, prog_fd, map_fd;
 
 	err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
-	if (err)
+	if (err) {
+		error_cnt++;
 		return;
+	}
 
 	map_fd = bpf_find_map(__func__, obj, "vip2tnl");
 	if (map_fd < 0)
@@ -223,8 +194,10 @@ static void test_l4lb(void)
 	u32 *magic = (u32 *)buf;
 
 	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
-	if (err)
+	if (err) {
+		error_cnt++;
 		return;
+	}
 
 	map_fd = bpf_find_map(__func__, obj, "vip_map");
 	if (map_fd < 0)
@@ -280,8 +253,10 @@ static void test_tcp_estats(void)
 
 	err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
 	CHECK(err, "", "err %d errno %d\n", err, errno);
-	if (err)
+	if (err) {
+		error_cnt++;
 		return;
+	}
 
 	bpf_object__close(obj);
 }
@@ -336,6 +311,8 @@ static void test_bpf_obj_id(void)
 		/* test_obj_id.o is a dumb prog. It should never fail
 		 * to load.
 		 */
+		if (err)
+			error_cnt++;
 		assert(!err);
 
 		/* Check getting prog info */
@@ -496,8 +473,10 @@ static void test_pkt_md_access(void)
 	int err, prog_fd;
 
 	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
-	if (err)
+	if (err) {
+		error_cnt++;
 		return;
+	}
 
 	err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4),
 				NULL, NULL, &retval, &duration);