| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io |
| 3 | */ |
| 4 | #include <linux/bpf.h> |
| 5 | #include <linux/if_link.h> |
| 6 | #include <assert.h> |
| 7 | #include <errno.h> |
| 8 | #include <signal.h> |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <stdbool.h> |
| 12 | #include <string.h> |
| 13 | #include <net/if.h> |
| 14 | #include <unistd.h> |
| 15 | #include <libgen.h> |
| 16 | #include <sys/resource.h> |
| 17 | #include <sys/ioctl.h> |
| 18 | #include <sys/types.h> |
| 19 | #include <sys/socket.h> |
| 20 | #include <netinet/in.h> |
| 21 | |
| 22 | #include "bpf_util.h" |
| 23 | #include <bpf/bpf.h> |
| 24 | #include <bpf/libbpf.h> |
| 25 | |
| 26 | static int ifindex_in; |
| 27 | static int ifindex_out; |
| 28 | static bool ifindex_out_xdp_dummy_attached = true; |
| 29 | static bool xdp_devmap_attached; |
| 30 | static __u32 prog_id; |
| 31 | static __u32 dummy_prog_id; |
| 32 | |
| 33 | static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST; |
| 34 | static int rxcnt_map_fd; |
| 35 | |
| 36 | static void int_exit(int sig) |
| 37 | { |
| 38 | __u32 curr_prog_id = 0; |
| 39 | |
| 40 | if (bpf_get_link_xdp_id(ifindex_in, &curr_prog_id, xdp_flags)) { |
| 41 | printf("bpf_get_link_xdp_id failed\n"); |
| 42 | exit(1); |
| 43 | } |
| 44 | if (prog_id == curr_prog_id) |
| 45 | bpf_set_link_xdp_fd(ifindex_in, -1, xdp_flags); |
| 46 | else if (!curr_prog_id) |
| 47 | printf("couldn't find a prog id on iface IN\n"); |
| 48 | else |
| 49 | printf("program on iface IN changed, not removing\n"); |
| 50 | |
| 51 | if (ifindex_out_xdp_dummy_attached) { |
| 52 | curr_prog_id = 0; |
| 53 | if (bpf_get_link_xdp_id(ifindex_out, &curr_prog_id, |
| 54 | xdp_flags)) { |
| 55 | printf("bpf_get_link_xdp_id failed\n"); |
| 56 | exit(1); |
| 57 | } |
| 58 | if (dummy_prog_id == curr_prog_id) |
| 59 | bpf_set_link_xdp_fd(ifindex_out, -1, xdp_flags); |
| 60 | else if (!curr_prog_id) |
| 61 | printf("couldn't find a prog id on iface OUT\n"); |
| 62 | else |
| 63 | printf("program on iface OUT changed, not removing\n"); |
| 64 | } |
| 65 | exit(0); |
| 66 | } |
| 67 | |
| 68 | static void poll_stats(int interval, int ifindex) |
| 69 | { |
| 70 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
| 71 | __u64 values[nr_cpus], prev[nr_cpus]; |
| 72 | |
| 73 | memset(prev, 0, sizeof(prev)); |
| 74 | |
| 75 | while (1) { |
| 76 | __u64 sum = 0; |
| 77 | __u32 key = 0; |
| 78 | int i; |
| 79 | |
| 80 | sleep(interval); |
| 81 | assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0); |
| 82 | for (i = 0; i < nr_cpus; i++) |
| 83 | sum += (values[i] - prev[i]); |
| 84 | if (sum) |
| 85 | printf("ifindex %i: %10llu pkt/s\n", |
| 86 | ifindex, sum / interval); |
| 87 | memcpy(prev, values, sizeof(values)); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | static int get_mac_addr(unsigned int ifindex_out, void *mac_addr) |
| 92 | { |
| 93 | char ifname[IF_NAMESIZE]; |
| 94 | struct ifreq ifr; |
| 95 | int fd, ret = -1; |
| 96 | |
| 97 | fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 98 | if (fd < 0) |
| 99 | return ret; |
| 100 | |
| 101 | if (!if_indextoname(ifindex_out, ifname)) |
| 102 | goto err_out; |
| 103 | |
| 104 | strcpy(ifr.ifr_name, ifname); |
| 105 | |
| 106 | if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) |
| 107 | goto err_out; |
| 108 | |
| 109 | memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char)); |
| 110 | ret = 0; |
| 111 | |
| 112 | err_out: |
| 113 | close(fd); |
| 114 | return ret; |
| 115 | } |
| 116 | |
| 117 | static void usage(const char *prog) |
| 118 | { |
| 119 | fprintf(stderr, |
| 120 | "usage: %s [OPTS] <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n\n" |
| 121 | "OPTS:\n" |
| 122 | " -S use skb-mode\n" |
| 123 | " -N enforce native mode\n" |
| 124 | " -F force loading prog\n" |
| 125 | " -X load xdp program on egress\n", |
| 126 | prog); |
| 127 | } |
| 128 | |
| 129 | int main(int argc, char **argv) |
| 130 | { |
| 131 | struct bpf_prog_load_attr prog_load_attr = { |
| 132 | .prog_type = BPF_PROG_TYPE_UNSPEC, |
| 133 | }; |
| 134 | struct bpf_program *prog, *dummy_prog, *devmap_prog; |
| 135 | int prog_fd, dummy_prog_fd, devmap_prog_fd = 0; |
| 136 | int tx_port_map_fd, tx_mac_map_fd; |
| 137 | struct bpf_devmap_val devmap_val; |
| 138 | struct bpf_prog_info info = {}; |
| 139 | __u32 info_len = sizeof(info); |
| 140 | const char *optstr = "FSNX"; |
| 141 | struct bpf_object *obj; |
| 142 | int ret, opt, key = 0; |
| 143 | char filename[256]; |
| 144 | |
| 145 | while ((opt = getopt(argc, argv, optstr)) != -1) { |
| 146 | switch (opt) { |
| 147 | case 'S': |
| 148 | xdp_flags |= XDP_FLAGS_SKB_MODE; |
| 149 | break; |
| 150 | case 'N': |
| 151 | /* default, set below */ |
| 152 | break; |
| 153 | case 'F': |
| 154 | xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; |
| 155 | break; |
| 156 | case 'X': |
| 157 | xdp_devmap_attached = true; |
| 158 | break; |
| 159 | default: |
| 160 | usage(basename(argv[0])); |
| 161 | return 1; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) { |
| 166 | xdp_flags |= XDP_FLAGS_DRV_MODE; |
| 167 | } else if (xdp_devmap_attached) { |
| 168 | printf("Load xdp program on egress with SKB mode not supported yet\n"); |
| 169 | return 1; |
| 170 | } |
| 171 | |
| 172 | if (optind == argc) { |
| 173 | printf("usage: %s <IFNAME|IFINDEX>_IN <IFNAME|IFINDEX>_OUT\n", argv[0]); |
| 174 | return 1; |
| 175 | } |
| 176 | |
| 177 | ifindex_in = if_nametoindex(argv[optind]); |
| 178 | if (!ifindex_in) |
| 179 | ifindex_in = strtoul(argv[optind], NULL, 0); |
| 180 | |
| 181 | ifindex_out = if_nametoindex(argv[optind + 1]); |
| 182 | if (!ifindex_out) |
| 183 | ifindex_out = strtoul(argv[optind + 1], NULL, 0); |
| 184 | |
| 185 | printf("input: %d output: %d\n", ifindex_in, ifindex_out); |
| 186 | |
| 187 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
| 188 | prog_load_attr.file = filename; |
| 189 | |
| 190 | if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) |
| 191 | return 1; |
| 192 | |
| 193 | if (xdp_flags & XDP_FLAGS_SKB_MODE) { |
| 194 | prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_general"); |
| 195 | tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port_general"); |
| 196 | } else { |
| 197 | prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_native"); |
| 198 | tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port_native"); |
| 199 | } |
| 200 | dummy_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_dummy_prog"); |
| 201 | if (!prog || dummy_prog < 0 || tx_port_map_fd < 0) { |
| 202 | printf("finding prog/dummy_prog/tx_port_map in obj file failed\n"); |
| 203 | goto out; |
| 204 | } |
| 205 | prog_fd = bpf_program__fd(prog); |
| 206 | dummy_prog_fd = bpf_program__fd(dummy_prog); |
| 207 | if (prog_fd < 0 || dummy_prog_fd < 0 || tx_port_map_fd < 0) { |
| 208 | printf("bpf_prog_load_xattr: %s\n", strerror(errno)); |
| 209 | return 1; |
| 210 | } |
| 211 | |
| 212 | tx_mac_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_mac"); |
| 213 | rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt"); |
| 214 | if (tx_mac_map_fd < 0 || rxcnt_map_fd < 0) { |
| 215 | printf("bpf_object__find_map_fd_by_name failed\n"); |
| 216 | return 1; |
| 217 | } |
| 218 | |
| 219 | if (bpf_set_link_xdp_fd(ifindex_in, prog_fd, xdp_flags) < 0) { |
| 220 | printf("ERROR: link set xdp fd failed on %d\n", ifindex_in); |
| 221 | return 1; |
| 222 | } |
| 223 | |
| 224 | ret = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len); |
| 225 | if (ret) { |
| 226 | printf("can't get prog info - %s\n", strerror(errno)); |
| 227 | return ret; |
| 228 | } |
| 229 | prog_id = info.id; |
| 230 | |
| 231 | /* Loading dummy XDP prog on out-device */ |
| 232 | if (bpf_set_link_xdp_fd(ifindex_out, dummy_prog_fd, |
| 233 | (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) { |
| 234 | printf("WARN: link set xdp fd failed on %d\n", ifindex_out); |
| 235 | ifindex_out_xdp_dummy_attached = false; |
| 236 | } |
| 237 | |
| 238 | memset(&info, 0, sizeof(info)); |
| 239 | ret = bpf_obj_get_info_by_fd(dummy_prog_fd, &info, &info_len); |
| 240 | if (ret) { |
| 241 | printf("can't get prog info - %s\n", strerror(errno)); |
| 242 | return ret; |
| 243 | } |
| 244 | dummy_prog_id = info.id; |
| 245 | |
| 246 | /* Load 2nd xdp prog on egress. */ |
| 247 | if (xdp_devmap_attached) { |
| 248 | unsigned char mac_addr[6]; |
| 249 | |
| 250 | devmap_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_egress"); |
| 251 | if (!devmap_prog) { |
| 252 | printf("finding devmap_prog in obj file failed\n"); |
| 253 | goto out; |
| 254 | } |
| 255 | devmap_prog_fd = bpf_program__fd(devmap_prog); |
| 256 | if (devmap_prog_fd < 0) { |
| 257 | printf("finding devmap_prog fd failed\n"); |
| 258 | goto out; |
| 259 | } |
| 260 | |
| 261 | if (get_mac_addr(ifindex_out, mac_addr) < 0) { |
| 262 | printf("get interface %d mac failed\n", ifindex_out); |
| 263 | goto out; |
| 264 | } |
| 265 | |
| 266 | ret = bpf_map_update_elem(tx_mac_map_fd, &key, mac_addr, 0); |
| 267 | if (ret) { |
| 268 | perror("bpf_update_elem tx_mac_map_fd"); |
| 269 | goto out; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | signal(SIGINT, int_exit); |
| 274 | signal(SIGTERM, int_exit); |
| 275 | |
| 276 | devmap_val.ifindex = ifindex_out; |
| 277 | devmap_val.bpf_prog.fd = devmap_prog_fd; |
| 278 | ret = bpf_map_update_elem(tx_port_map_fd, &key, &devmap_val, 0); |
| 279 | if (ret) { |
| 280 | perror("bpf_update_elem"); |
| 281 | goto out; |
| 282 | } |
| 283 | |
| 284 | poll_stats(2, ifindex_out); |
| 285 | |
| 286 | out: |
| 287 | return 0; |
| 288 | } |