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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/samples/bpf/test_probe_write_user_user.c
..
..
@@ -1,21 +1,22 @@
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1
 // SPDX-License-Identifier: GPL-2.0
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2
 #include <stdio.h>
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3
 #include <assert.h>
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-#include <linux/bpf.h>
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4
 #include <unistd.h>
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5
 #include <bpf/bpf.h>
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-#include "bpf_load.h"
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+#include <bpf/libbpf.h>
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 #include <sys/socket.h>
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-#include <string.h>
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8
 #include <netinet/in.h>
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9
 #include <arpa/inet.h>
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10
 
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 int main(int ac, char **argv)
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 {
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-	int serverfd, serverconnfd, clientfd;
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-	socklen_t sockaddr_len;
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-	struct sockaddr serv_addr, mapped_addr, tmp_addr;
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 	struct sockaddr_in *serv_addr_in, *mapped_addr_in, *tmp_addr_in;
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+	struct sockaddr serv_addr, mapped_addr, tmp_addr;
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+	int serverfd, serverconnfd, clientfd, map_fd;
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+	struct bpf_link *link = NULL;
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+	struct bpf_program *prog;
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+	struct bpf_object *obj;
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+	socklen_t sockaddr_len;
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 	char filename[256];
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 	char *ip;
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22
 
..
..
@@ -24,10 +25,35 @@
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 	tmp_addr_in = (struct sockaddr_in *)&tmp_addr;
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26
 
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 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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+	obj = bpf_object__open_file(filename, NULL);
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+	if (libbpf_get_error(obj)) {
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+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
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+		return 0;
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+	}
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-	if (load_bpf_file(filename)) {
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-		printf("%s", bpf_log_buf);
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-		return 1;
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+	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
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+	if (libbpf_get_error(prog)) {
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+		fprintf(stderr, "ERROR: finding a prog in obj file failed\n");
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+		goto cleanup;
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+	}
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+
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+	/* load BPF program */
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+	if (bpf_object__load(obj)) {
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+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
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+		goto cleanup;
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+	}
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+
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+	map_fd = bpf_object__find_map_fd_by_name(obj, "dnat_map");
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+	if (map_fd < 0) {
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+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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+		goto cleanup;
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+	}
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+
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+	link = bpf_program__attach(prog);
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+	if (libbpf_get_error(link)) {
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+		fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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+		link = NULL;
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+		goto cleanup;
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57
 	}
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58
 
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 	assert((serverfd = socket(AF_INET, SOCK_STREAM, 0)) > 0);
..
..
@@ -51,7 +77,7 @@
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 	mapped_addr_in->sin_port = htons(5555);
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 	mapped_addr_in->sin_addr.s_addr = inet_addr("255.255.255.255");
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79
 
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-	assert(!bpf_map_update_elem(map_fd[0], &mapped_addr, &serv_addr, BPF_ANY));
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+	assert(!bpf_map_update_elem(map_fd, &mapped_addr, &serv_addr, BPF_ANY));
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81
 
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 	assert(listen(serverfd, 5) == 0);
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83
 
..
..
@@ -75,5 +101,8 @@
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 	/* Is the server's getsockname = the socket getpeername */
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 	assert(memcmp(&serv_addr, &tmp_addr, sizeof(struct sockaddr_in)) == 0);
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103
 
104
+cleanup:
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+	bpf_link__destroy(link);
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+	bpf_object__close(obj);
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 	return 0;
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 }