diff options
Diffstat (limited to 'man2/bpf.2')
| -rw-r--r-- | man2/bpf.2 | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/man2/bpf.2 b/man2/bpf.2 index a5d08703a..d32435a1d 100644 --- a/man2/bpf.2 +++ b/man2/bpf.2 @@ -175,7 +175,7 @@ union bpf_attr { __u32 max_entries; /* maximum number of entries in a map */ }; - +\& struct { /* Used by BPF_MAP_*_ELEM and BPF_MAP_GET_NEXT_KEY commands */ __u32 map_fd; @@ -186,7 +186,7 @@ union bpf_attr { }; __u64 flags; }; - +\& struct { /* Used by BPF_PROG_LOAD */ __u32 prog_type; __u32 insn_cnt; @@ -247,7 +247,7 @@ bpf_create_map(enum bpf_map_type map_type, .value_size = value_size, .max_entries = max_entries }; - +\& return bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); } .EE @@ -392,7 +392,7 @@ bpf_lookup_elem(int fd, const void *key, void *value) .key = ptr_to_u64(key), .value = ptr_to_u64(value), }; - +\& return bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); } .EE @@ -431,7 +431,7 @@ bpf_update_elem(int fd, const void *key, const void *value, .value = ptr_to_u64(value), .flags = flags, }; - +\& return bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); } .EE @@ -500,7 +500,7 @@ bpf_delete_elem(int fd, const void *key) .map_fd = fd, .key = ptr_to_u64(key), }; - +\& return bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); } .EE @@ -533,7 +533,7 @@ bpf_get_next_key(int fd, const void *key, void *next_key) .key = ptr_to_u64(key), .next_key = ptr_to_u64(next_key), }; - +\& return bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); } .EE @@ -714,7 +714,7 @@ with this eBPF program. .in +4n .EX char bpf_log_buf[LOG_BUF_SIZE]; - +\& int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, int insn_cnt, @@ -729,7 +729,7 @@ bpf_prog_load(enum bpf_prog_type type, .log_size = LOG_BUF_SIZE, .log_level = 1, }; - +\& return bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); } .EE @@ -1197,7 +1197,7 @@ main(int argc, char *argv[]) { int sock, map_fd, prog_fd, key; long long value = 0, tcp_cnt, udp_cnt; - +\& map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(key), sizeof(value), 256); if (map_fd < 0) { @@ -1205,7 +1205,7 @@ main(int argc, char *argv[]) /* likely not run as root */ return 1; } - +\& struct bpf_insn prog[] = { BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), /* r6 = r1 */ BPF_LD_ABS(BPF_B, ETH_HLEN + offsetof(struct iphdr, protocol)), @@ -1226,15 +1226,15 @@ main(int argc, char *argv[]) BPF_MOV64_IMM(BPF_REG_0, 0), /* r0 = 0 */ BPF_EXIT_INSN(), /* return r0 */ }; - +\& prog_fd = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, prog, sizeof(prog) / sizeof(prog[0]), "GPL"); - +\& sock = open_raw_sock("lo"); - +\& assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, sizeof(prog_fd)) == 0); - +\& for (;;) { key = IPPROTO_TCP; assert(bpf_lookup_elem(map_fd, &key, &tcp_cnt) == 0); @@ -1243,7 +1243,7 @@ main(int argc, char *argv[]) printf("TCP %lld UDP %lld packets\en", tcp_cnt, udp_cnt); sleep(1); } - +\& return 0; } .EE |