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195 lines
4.3 KiB
195 lines
4.3 KiB
#include <linux/unistd.h> |
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#include <linux/bpf.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <assert.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> |
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#include "bpf_insn.h" |
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#include "sock_example.h" |
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#include "bpf_util.h" |
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#define BPF_F_PIN (1 << 0) |
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#define BPF_F_GET (1 << 1) |
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#define BPF_F_PIN_GET (BPF_F_PIN | BPF_F_GET) |
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#define BPF_F_KEY (1 << 2) |
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#define BPF_F_VAL (1 << 3) |
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#define BPF_F_KEY_VAL (BPF_F_KEY | BPF_F_VAL) |
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#define BPF_M_UNSPEC 0 |
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#define BPF_M_MAP 1 |
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#define BPF_M_PROG 2 |
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char bpf_log_buf[BPF_LOG_BUF_SIZE]; |
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static void usage(void) |
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{ |
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printf("Usage: fds_example [...]\n"); |
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printf(" -F <file> File to pin/get object\n"); |
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printf(" -P |- pin object\n"); |
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printf(" -G `- get object\n"); |
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printf(" -m eBPF map mode\n"); |
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printf(" -k <key> |- map key\n"); |
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printf(" -v <value> `- map value\n"); |
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printf(" -p eBPF prog mode\n"); |
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printf(" -o <object> `- object file\n"); |
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printf(" -h Display this help.\n"); |
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} |
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static int bpf_prog_create(const char *object) |
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{ |
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static struct bpf_insn insns[] = { |
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BPF_MOV64_IMM(BPF_REG_0, 1), |
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BPF_EXIT_INSN(), |
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}; |
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size_t insns_cnt = ARRAY_SIZE(insns); |
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struct bpf_object *obj; |
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int err; |
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if (object) { |
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obj = bpf_object__open_file(object, NULL); |
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assert(!libbpf_get_error(obj)); |
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err = bpf_object__load(obj); |
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assert(!err); |
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return bpf_program__fd(bpf_object__next_program(obj, NULL)); |
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} else { |
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LIBBPF_OPTS(bpf_prog_load_opts, opts, |
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.log_buf = bpf_log_buf, |
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.log_size = BPF_LOG_BUF_SIZE, |
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); |
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return bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL", |
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insns, insns_cnt, &opts); |
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} |
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} |
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static int bpf_do_map(const char *file, uint32_t flags, uint32_t key, |
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uint32_t value) |
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{ |
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int fd, ret; |
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if (flags & BPF_F_PIN) { |
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fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(uint32_t), |
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sizeof(uint32_t), 1024, NULL); |
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printf("bpf: map fd:%d (%s)\n", fd, strerror(errno)); |
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assert(fd > 0); |
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ret = bpf_obj_pin(fd, file); |
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printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno)); |
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assert(ret == 0); |
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} else { |
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fd = bpf_obj_get(file); |
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printf("bpf: get fd:%d (%s)\n", fd, strerror(errno)); |
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assert(fd > 0); |
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} |
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if ((flags & BPF_F_KEY_VAL) == BPF_F_KEY_VAL) { |
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ret = bpf_map_update_elem(fd, &key, &value, 0); |
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printf("bpf: fd:%d u->(%u:%u) ret:(%d,%s)\n", fd, key, value, |
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ret, strerror(errno)); |
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assert(ret == 0); |
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} else if (flags & BPF_F_KEY) { |
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ret = bpf_map_lookup_elem(fd, &key, &value); |
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printf("bpf: fd:%d l->(%u):%u ret:(%d,%s)\n", fd, key, value, |
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ret, strerror(errno)); |
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assert(ret == 0); |
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} |
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return 0; |
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} |
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static int bpf_do_prog(const char *file, uint32_t flags, const char *object) |
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{ |
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int fd, sock, ret; |
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if (flags & BPF_F_PIN) { |
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fd = bpf_prog_create(object); |
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printf("bpf: prog fd:%d (%s)\n", fd, strerror(errno)); |
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assert(fd > 0); |
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ret = bpf_obj_pin(fd, file); |
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printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno)); |
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assert(ret == 0); |
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} else { |
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fd = bpf_obj_get(file); |
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printf("bpf: get fd:%d (%s)\n", fd, strerror(errno)); |
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assert(fd > 0); |
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} |
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sock = open_raw_sock("lo"); |
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assert(sock > 0); |
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ret = setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &fd, sizeof(fd)); |
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printf("bpf: sock:%d <- fd:%d attached ret:(%d,%s)\n", sock, fd, |
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ret, strerror(errno)); |
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assert(ret == 0); |
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return 0; |
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} |
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int main(int argc, char **argv) |
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{ |
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const char *file = NULL, *object = NULL; |
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uint32_t key = 0, value = 0, flags = 0; |
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int opt, mode = BPF_M_UNSPEC; |
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while ((opt = getopt(argc, argv, "F:PGmk:v:po:")) != -1) { |
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switch (opt) { |
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/* General args */ |
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case 'F': |
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file = optarg; |
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break; |
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case 'P': |
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flags |= BPF_F_PIN; |
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break; |
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case 'G': |
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flags |= BPF_F_GET; |
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break; |
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/* Map-related args */ |
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case 'm': |
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mode = BPF_M_MAP; |
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break; |
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case 'k': |
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key = strtoul(optarg, NULL, 0); |
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flags |= BPF_F_KEY; |
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break; |
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case 'v': |
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value = strtoul(optarg, NULL, 0); |
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flags |= BPF_F_VAL; |
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break; |
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/* Prog-related args */ |
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case 'p': |
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mode = BPF_M_PROG; |
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break; |
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case 'o': |
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object = optarg; |
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break; |
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default: |
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goto out; |
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} |
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} |
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if (!(flags & BPF_F_PIN_GET) || !file) |
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goto out; |
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switch (mode) { |
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case BPF_M_MAP: |
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return bpf_do_map(file, flags, key, value); |
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case BPF_M_PROG: |
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return bpf_do_prog(file, flags, object); |
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} |
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out: |
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usage(); |
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return -1; |
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}
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