Alexei Starovoitov | 3c731eb | 2014-09-26 00:17:07 -0700 | [diff] [blame] | 1 | /* eBPF mini library */ |
| 2 | #include <stdlib.h> |
| 3 | #include <stdio.h> |
| 4 | #include <linux/unistd.h> |
| 5 | #include <unistd.h> |
| 6 | #include <string.h> |
| 7 | #include <linux/netlink.h> |
| 8 | #include <linux/bpf.h> |
| 9 | #include <errno.h> |
Alexei Starovoitov | 03f4723 | 2014-12-01 15:06:36 -0800 | [diff] [blame] | 10 | #include <net/ethernet.h> |
| 11 | #include <net/if.h> |
| 12 | #include <linux/if_packet.h> |
| 13 | #include <arpa/inet.h> |
Alexei Starovoitov | 3c731eb | 2014-09-26 00:17:07 -0700 | [diff] [blame] | 14 | #include "libbpf.h" |
| 15 | |
| 16 | static __u64 ptr_to_u64(void *ptr) |
| 17 | { |
| 18 | return (__u64) (unsigned long) ptr; |
| 19 | } |
| 20 | |
| 21 | int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size, |
| 22 | int max_entries) |
| 23 | { |
| 24 | union bpf_attr attr = { |
| 25 | .map_type = map_type, |
| 26 | .key_size = key_size, |
| 27 | .value_size = value_size, |
| 28 | .max_entries = max_entries |
| 29 | }; |
| 30 | |
| 31 | return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr)); |
| 32 | } |
| 33 | |
Alexei Starovoitov | ffb65f2 | 2014-11-13 17:36:48 -0800 | [diff] [blame] | 34 | int bpf_update_elem(int fd, void *key, void *value, unsigned long long flags) |
Alexei Starovoitov | 3c731eb | 2014-09-26 00:17:07 -0700 | [diff] [blame] | 35 | { |
| 36 | union bpf_attr attr = { |
| 37 | .map_fd = fd, |
| 38 | .key = ptr_to_u64(key), |
| 39 | .value = ptr_to_u64(value), |
Alexei Starovoitov | ffb65f2 | 2014-11-13 17:36:48 -0800 | [diff] [blame] | 40 | .flags = flags, |
Alexei Starovoitov | 3c731eb | 2014-09-26 00:17:07 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | return syscall(__NR_bpf, BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); |
| 44 | } |
| 45 | |
| 46 | int bpf_lookup_elem(int fd, void *key, void *value) |
| 47 | { |
| 48 | union bpf_attr attr = { |
| 49 | .map_fd = fd, |
| 50 | .key = ptr_to_u64(key), |
| 51 | .value = ptr_to_u64(value), |
| 52 | }; |
| 53 | |
| 54 | return syscall(__NR_bpf, BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); |
| 55 | } |
| 56 | |
| 57 | int bpf_delete_elem(int fd, void *key) |
| 58 | { |
| 59 | union bpf_attr attr = { |
| 60 | .map_fd = fd, |
| 61 | .key = ptr_to_u64(key), |
| 62 | }; |
| 63 | |
| 64 | return syscall(__NR_bpf, BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); |
| 65 | } |
| 66 | |
| 67 | int bpf_get_next_key(int fd, void *key, void *next_key) |
| 68 | { |
| 69 | union bpf_attr attr = { |
| 70 | .map_fd = fd, |
| 71 | .key = ptr_to_u64(key), |
| 72 | .next_key = ptr_to_u64(next_key), |
| 73 | }; |
| 74 | |
| 75 | return syscall(__NR_bpf, BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); |
| 76 | } |
| 77 | |
| 78 | #define ROUND_UP(x, n) (((x) + (n) - 1u) & ~((n) - 1u)) |
| 79 | |
| 80 | char bpf_log_buf[LOG_BUF_SIZE]; |
| 81 | |
| 82 | int bpf_prog_load(enum bpf_prog_type prog_type, |
| 83 | const struct bpf_insn *insns, int prog_len, |
Alexei Starovoitov | b896c4f | 2015-03-25 12:49:23 -0700 | [diff] [blame] | 84 | const char *license, int kern_version) |
Alexei Starovoitov | 3c731eb | 2014-09-26 00:17:07 -0700 | [diff] [blame] | 85 | { |
| 86 | union bpf_attr attr = { |
| 87 | .prog_type = prog_type, |
| 88 | .insns = ptr_to_u64((void *) insns), |
| 89 | .insn_cnt = prog_len / sizeof(struct bpf_insn), |
| 90 | .license = ptr_to_u64((void *) license), |
| 91 | .log_buf = ptr_to_u64(bpf_log_buf), |
| 92 | .log_size = LOG_BUF_SIZE, |
| 93 | .log_level = 1, |
| 94 | }; |
| 95 | |
Alexei Starovoitov | b896c4f | 2015-03-25 12:49:23 -0700 | [diff] [blame] | 96 | /* assign one field outside of struct init to make sure any |
| 97 | * padding is zero initialized |
| 98 | */ |
| 99 | attr.kern_version = kern_version; |
| 100 | |
Alexei Starovoitov | 3c731eb | 2014-09-26 00:17:07 -0700 | [diff] [blame] | 101 | bpf_log_buf[0] = 0; |
| 102 | |
| 103 | return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); |
| 104 | } |
Alexei Starovoitov | 03f4723 | 2014-12-01 15:06:36 -0800 | [diff] [blame] | 105 | |
Daniel Borkmann | 42984d7 | 2015-10-29 14:58:10 +0100 | [diff] [blame] | 106 | int bpf_obj_pin(int fd, const char *pathname) |
| 107 | { |
| 108 | union bpf_attr attr = { |
| 109 | .pathname = ptr_to_u64((void *)pathname), |
| 110 | .bpf_fd = fd, |
| 111 | }; |
| 112 | |
| 113 | return syscall(__NR_bpf, BPF_OBJ_PIN, &attr, sizeof(attr)); |
| 114 | } |
| 115 | |
| 116 | int bpf_obj_get(const char *pathname) |
| 117 | { |
| 118 | union bpf_attr attr = { |
| 119 | .pathname = ptr_to_u64((void *)pathname), |
| 120 | }; |
| 121 | |
| 122 | return syscall(__NR_bpf, BPF_OBJ_GET, &attr, sizeof(attr)); |
| 123 | } |
| 124 | |
Alexei Starovoitov | 03f4723 | 2014-12-01 15:06:36 -0800 | [diff] [blame] | 125 | int open_raw_sock(const char *name) |
| 126 | { |
| 127 | struct sockaddr_ll sll; |
| 128 | int sock; |
| 129 | |
| 130 | sock = socket(PF_PACKET, SOCK_RAW | SOCK_NONBLOCK | SOCK_CLOEXEC, htons(ETH_P_ALL)); |
| 131 | if (sock < 0) { |
| 132 | printf("cannot create raw socket\n"); |
| 133 | return -1; |
| 134 | } |
| 135 | |
| 136 | memset(&sll, 0, sizeof(sll)); |
| 137 | sll.sll_family = AF_PACKET; |
| 138 | sll.sll_ifindex = if_nametoindex(name); |
| 139 | sll.sll_protocol = htons(ETH_P_ALL); |
| 140 | if (bind(sock, (struct sockaddr *)&sll, sizeof(sll)) < 0) { |
| 141 | printf("bind to %s: %s\n", name, strerror(errno)); |
| 142 | close(sock); |
| 143 | return -1; |
| 144 | } |
| 145 | |
| 146 | return sock; |
| 147 | } |
Alexei Starovoitov | b896c4f | 2015-03-25 12:49:23 -0700 | [diff] [blame] | 148 | |
| 149 | int perf_event_open(struct perf_event_attr *attr, int pid, int cpu, |
| 150 | int group_fd, unsigned long flags) |
| 151 | { |
| 152 | return syscall(__NR_perf_event_open, attr, pid, cpu, |
| 153 | group_fd, flags); |
| 154 | } |