1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bpf.h> 3 #include <linux/if_link.h> 4 #include <assert.h> 5 #include <errno.h> 6 #include <signal.h> 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <string.h> 10 #include <net/if.h> 11 #include <unistd.h> 12 #include <libgen.h> 13 #include <sys/resource.h> 14 #include <sys/ioctl.h> 15 #include <sys/types.h> 16 #include <sys/socket.h> 17 #include <netinet/in.h> 18 19 #include "bpf_util.h" 20 #include <bpf/bpf.h> 21 #include <bpf/libbpf.h> 22 23 #define MAX_IFACE_NUM 32 24 #define MAX_INDEX_NUM 1024 25 26 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST; 27 static int ifaces[MAX_IFACE_NUM] = {}; 28 29 static void int_exit(int sig) 30 { 31 __u32 prog_id = 0; 32 int i; 33 34 for (i = 0; ifaces[i] > 0; i++) { 35 if (bpf_get_link_xdp_id(ifaces[i], &prog_id, xdp_flags)) { 36 printf("bpf_get_link_xdp_id failed\n"); 37 exit(1); 38 } 39 if (prog_id) 40 bpf_set_link_xdp_fd(ifaces[i], -1, xdp_flags); 41 } 42 43 exit(0); 44 } 45 46 static int get_mac_addr(unsigned int ifindex, void *mac_addr) 47 { 48 char ifname[IF_NAMESIZE]; 49 struct ifreq ifr; 50 int fd, ret = -1; 51 52 fd = socket(AF_INET, SOCK_DGRAM, 0); 53 if (fd < 0) 54 return ret; 55 56 if (!if_indextoname(ifindex, ifname)) 57 goto err_out; 58 59 strcpy(ifr.ifr_name, ifname); 60 61 if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) 62 goto err_out; 63 64 memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char)); 65 ret = 0; 66 67 err_out: 68 close(fd); 69 return ret; 70 } 71 72 static void usage(const char *prog) 73 { 74 fprintf(stderr, 75 "usage: %s [OPTS] <IFNAME|IFINDEX> <IFNAME|IFINDEX> ...\n" 76 "OPTS:\n" 77 " -S use skb-mode\n" 78 " -N enforce native mode\n" 79 " -F force loading prog\n" 80 " -X load xdp program on egress\n", 81 prog); 82 } 83 84 int main(int argc, char **argv) 85 { 86 int prog_fd, group_all, mac_map; 87 struct bpf_program *ingress_prog, *egress_prog; 88 struct bpf_prog_load_attr prog_load_attr = { 89 .prog_type = BPF_PROG_TYPE_UNSPEC, 90 }; 91 int i, ret, opt, egress_prog_fd = 0; 92 struct bpf_devmap_val devmap_val; 93 bool attach_egress_prog = false; 94 unsigned char mac_addr[6]; 95 char ifname[IF_NAMESIZE]; 96 struct bpf_object *obj; 97 unsigned int ifindex; 98 char filename[256]; 99 100 while ((opt = getopt(argc, argv, "SNFX")) != -1) { 101 switch (opt) { 102 case 'S': 103 xdp_flags |= XDP_FLAGS_SKB_MODE; 104 break; 105 case 'N': 106 /* default, set below */ 107 break; 108 case 'F': 109 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; 110 break; 111 case 'X': 112 attach_egress_prog = true; 113 break; 114 default: 115 usage(basename(argv[0])); 116 return 1; 117 } 118 } 119 120 if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) { 121 xdp_flags |= XDP_FLAGS_DRV_MODE; 122 } else if (attach_egress_prog) { 123 printf("Load xdp program on egress with SKB mode not supported yet\n"); 124 goto err_out; 125 } 126 127 if (optind == argc) { 128 printf("usage: %s <IFNAME|IFINDEX> <IFNAME|IFINDEX> ...\n", argv[0]); 129 goto err_out; 130 } 131 132 printf("Get interfaces:"); 133 for (i = 0; i < MAX_IFACE_NUM && argv[optind + i]; i++) { 134 ifaces[i] = if_nametoindex(argv[optind + i]); 135 if (!ifaces[i]) 136 ifaces[i] = strtoul(argv[optind + i], NULL, 0); 137 if (!if_indextoname(ifaces[i], ifname)) { 138 perror("Invalid interface name or i"); 139 goto err_out; 140 } 141 if (ifaces[i] > MAX_INDEX_NUM) { 142 printf(" interface index too large\n"); 143 goto err_out; 144 } 145 printf(" %d", ifaces[i]); 146 } 147 printf("\n"); 148 149 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 150 prog_load_attr.file = filename; 151 152 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) 153 goto err_out; 154 155 if (attach_egress_prog) 156 group_all = bpf_object__find_map_fd_by_name(obj, "map_egress"); 157 else 158 group_all = bpf_object__find_map_fd_by_name(obj, "map_all"); 159 mac_map = bpf_object__find_map_fd_by_name(obj, "mac_map"); 160 161 if (group_all < 0 || mac_map < 0) { 162 printf("bpf_object__find_map_fd_by_name failed\n"); 163 goto err_out; 164 } 165 166 if (attach_egress_prog) { 167 /* Find ingress/egress prog for 2nd xdp prog */ 168 ingress_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_all_prog"); 169 egress_prog = bpf_object__find_program_by_name(obj, "xdp_devmap_prog"); 170 if (!ingress_prog || !egress_prog) { 171 printf("finding ingress/egress_prog in obj file failed\n"); 172 goto err_out; 173 } 174 prog_fd = bpf_program__fd(ingress_prog); 175 egress_prog_fd = bpf_program__fd(egress_prog); 176 if (prog_fd < 0 || egress_prog_fd < 0) { 177 printf("find egress_prog fd failed\n"); 178 goto err_out; 179 } 180 } 181 182 signal(SIGINT, int_exit); 183 signal(SIGTERM, int_exit); 184 185 /* Init forward multicast groups and exclude group */ 186 for (i = 0; ifaces[i] > 0; i++) { 187 ifindex = ifaces[i]; 188 189 if (attach_egress_prog) { 190 ret = get_mac_addr(ifindex, mac_addr); 191 if (ret < 0) { 192 printf("get interface %d mac failed\n", ifindex); 193 goto err_out; 194 } 195 ret = bpf_map_update_elem(mac_map, &ifindex, mac_addr, 0); 196 if (ret) { 197 perror("bpf_update_elem mac_map failed\n"); 198 goto err_out; 199 } 200 } 201 202 /* Add all the interfaces to group all */ 203 devmap_val.ifindex = ifindex; 204 devmap_val.bpf_prog.fd = egress_prog_fd; 205 ret = bpf_map_update_elem(group_all, &ifindex, &devmap_val, 0); 206 if (ret) { 207 perror("bpf_map_update_elem"); 208 goto err_out; 209 } 210 211 /* bind prog_fd to each interface */ 212 ret = bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags); 213 if (ret) { 214 printf("Set xdp fd failed on %d\n", ifindex); 215 goto err_out; 216 } 217 } 218 219 /* sleep some time for testing */ 220 sleep(999); 221 222 return 0; 223 224 err_out: 225 return 1; 226 } 227