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e5659e4e19
since commit 450b167fb9be("libbpf: clean up SEC() handling"),
sec_def_matches() does not recognize "socket/xxx" as "socket", therefore,
the BPF program type is not recognized.
Instead of sockex3_user.c parsing section names to get the BPF program fd.
We use the program array map to assign a static index to each BPF program
(get inspired by selftests/bpf progs/test_prog_array_init.c).
Therefore, use SEC("socket") as section name instead of SEC("socket/xxx"),
so that the BPF program is parsed to SOCKET_FILTER type. The "missing BPF
prog type" problem is solved.
How to reproduce this error:
$ cd samples/bpf
$ sudo ./sockex3
libbpf: prog 'bpf_func_PARSE_IP': missing BPF prog type, check ELF section name 'socket/3'
libbpf: prog 'bpf_func_PARSE_IP': failed to load: -22
libbpf: failed to load object './sockex3_kern.o'
ERROR: loading BPF object file failed
Signed-off-by: Rong Tao <rongtao@cestc.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/tencent_EBA3C18864069E42175946973C2ACBAF5408@qq.com
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <assert.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "sock_example.h"
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#include <unistd.h>
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#include <arpa/inet.h>
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struct flow_key_record {
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__be32 src;
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__be32 dst;
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union {
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__be32 ports;
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__be16 port16[2];
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};
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__u32 ip_proto;
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};
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struct pair {
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__u64 packets;
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__u64 bytes;
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};
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int main(int argc, char **argv)
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{
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int i, sock, fd, main_prog_fd, hash_map_fd;
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struct bpf_program *prog;
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struct bpf_object *obj;
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char filename[256];
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FILE *f;
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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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/* 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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hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
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if (hash_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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/* find BPF main program */
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main_prog_fd = 0;
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bpf_object__for_each_program(prog, obj) {
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fd = bpf_program__fd(prog);
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if (!strcmp(bpf_program__name(prog), "main_prog"))
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main_prog_fd = fd;
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}
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if (main_prog_fd == 0) {
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fprintf(stderr, "ERROR: can't find main_prog\n");
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goto cleanup;
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}
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sock = open_raw_sock("lo");
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/* attach BPF program to socket */
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assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,
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sizeof(__u32)) == 0);
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if (argc > 1)
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f = popen("ping -4 -c5 localhost", "r");
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else
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f = popen("netperf -l 4 localhost", "r");
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(void) f;
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for (i = 0; i < 5; i++) {
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struct flow_key_record key = {}, next_key;
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struct pair value;
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sleep(1);
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printf("IP src.port -> dst.port bytes packets\n");
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while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {
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bpf_map_lookup_elem(hash_map_fd, &next_key, &value);
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printf("%s.%05d -> %s.%05d %12lld %12lld\n",
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inet_ntoa((struct in_addr){htonl(next_key.src)}),
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next_key.port16[0],
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inet_ntoa((struct in_addr){htonl(next_key.dst)}),
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next_key.port16[1],
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value.bytes, value.packets);
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key = next_key;
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}
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}
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cleanup:
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bpf_object__close(obj);
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return 0;
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}
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