1 // SPDX-License-Identifier: GPL-2.0 2 #include <assert.h> 3 #include <bpf/bpf.h> 4 #include <linux/filter.h> 5 #include <stdio.h> 6 #include <stdlib.h> 7 #include <sys/sysinfo.h> 8 9 #include "bpf_rlimit.h" 10 #include "cgroup_helpers.h" 11 12 char bpf_log_buf[BPF_LOG_BUF_SIZE]; 13 14 #define TEST_CGROUP "/test-bpf-cgroup-storage-buf/" 15 16 int main(int argc, char **argv) 17 { 18 struct bpf_insn prog[] = { 19 BPF_LD_MAP_FD(BPF_REG_1, 0), /* percpu map fd */ 20 BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */ 21 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 22 BPF_FUNC_get_local_storage), 23 BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0), 24 BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1), 25 BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0), 26 27 BPF_LD_MAP_FD(BPF_REG_1, 0), /* map fd */ 28 BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */ 29 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 30 BPF_FUNC_get_local_storage), 31 BPF_MOV64_IMM(BPF_REG_1, 1), 32 BPF_STX_XADD(BPF_DW, BPF_REG_0, BPF_REG_1, 0), 33 BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0), 34 BPF_ALU64_IMM(BPF_AND, BPF_REG_1, 0x1), 35 BPF_MOV64_REG(BPF_REG_0, BPF_REG_1), 36 BPF_EXIT_INSN(), 37 }; 38 size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn); 39 int error = EXIT_FAILURE; 40 int map_fd, percpu_map_fd, prog_fd, cgroup_fd; 41 struct bpf_cgroup_storage_key key; 42 unsigned long long value; 43 unsigned long long *percpu_value; 44 int cpu, nproc; 45 46 nproc = get_nprocs_conf(); 47 percpu_value = malloc(sizeof(*percpu_value) * nproc); 48 if (!percpu_value) { 49 printf("Not enough memory for per-cpu area (%d cpus)\n", nproc); 50 goto err; 51 } 52 53 map_fd = bpf_create_map(BPF_MAP_TYPE_CGROUP_STORAGE, sizeof(key), 54 sizeof(value), 0, 0); 55 if (map_fd < 0) { 56 printf("Failed to create map: %s\n", strerror(errno)); 57 goto out; 58 } 59 60 percpu_map_fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE, 61 sizeof(key), sizeof(value), 0, 0); 62 if (percpu_map_fd < 0) { 63 printf("Failed to create map: %s\n", strerror(errno)); 64 goto out; 65 } 66 67 prog[0].imm = percpu_map_fd; 68 prog[7].imm = map_fd; 69 prog_fd = bpf_load_program(BPF_PROG_TYPE_CGROUP_SKB, 70 prog, insns_cnt, "GPL", 0, 71 bpf_log_buf, BPF_LOG_BUF_SIZE); 72 if (prog_fd < 0) { 73 printf("Failed to load bpf program: %s\n", bpf_log_buf); 74 goto out; 75 } 76 77 cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); 78 79 /* Attach the bpf program */ 80 if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) { 81 printf("Failed to attach bpf program\n"); 82 goto err; 83 } 84 85 if (bpf_map_get_next_key(map_fd, NULL, &key)) { 86 printf("Failed to get the first key in cgroup storage\n"); 87 goto err; 88 } 89 90 if (bpf_map_lookup_elem(map_fd, &key, &value)) { 91 printf("Failed to lookup cgroup storage 0\n"); 92 goto err; 93 } 94 95 for (cpu = 0; cpu < nproc; cpu++) 96 percpu_value[cpu] = 1000; 97 98 if (bpf_map_update_elem(percpu_map_fd, &key, percpu_value, 0)) { 99 printf("Failed to update the data in the cgroup storage\n"); 100 goto err; 101 } 102 103 /* Every second packet should be dropped */ 104 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 105 assert(system("ping localhost -c 1 -W 1 -q > /dev/null")); 106 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 107 108 /* Check the counter in the cgroup local storage */ 109 if (bpf_map_lookup_elem(map_fd, &key, &value)) { 110 printf("Failed to lookup cgroup storage\n"); 111 goto err; 112 } 113 114 if (value != 3) { 115 printf("Unexpected data in the cgroup storage: %llu\n", value); 116 goto err; 117 } 118 119 /* Bump the counter in the cgroup local storage */ 120 value++; 121 if (bpf_map_update_elem(map_fd, &key, &value, 0)) { 122 printf("Failed to update the data in the cgroup storage\n"); 123 goto err; 124 } 125 126 /* Every second packet should be dropped */ 127 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 128 assert(system("ping localhost -c 1 -W 1 -q > /dev/null")); 129 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 130 131 /* Check the final value of the counter in the cgroup local storage */ 132 if (bpf_map_lookup_elem(map_fd, &key, &value)) { 133 printf("Failed to lookup the cgroup storage\n"); 134 goto err; 135 } 136 137 if (value != 7) { 138 printf("Unexpected data in the cgroup storage: %llu\n", value); 139 goto err; 140 } 141 142 /* Check the final value of the counter in the percpu local storage */ 143 144 for (cpu = 0; cpu < nproc; cpu++) 145 percpu_value[cpu] = 0; 146 147 if (bpf_map_lookup_elem(percpu_map_fd, &key, percpu_value)) { 148 printf("Failed to lookup the per-cpu cgroup storage\n"); 149 goto err; 150 } 151 152 value = 0; 153 for (cpu = 0; cpu < nproc; cpu++) 154 value += percpu_value[cpu]; 155 156 if (value != nproc * 1000 + 6) { 157 printf("Unexpected data in the per-cpu cgroup storage\n"); 158 goto err; 159 } 160 161 error = 0; 162 printf("test_cgroup_storage:PASS\n"); 163 164 err: 165 cleanup_cgroup_environment(); 166 free(percpu_value); 167 168 out: 169 return error; 170 } 171