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 #include "testing_helpers.h" 12 13 char bpf_log_buf[BPF_LOG_BUF_SIZE]; 14 15 #define TEST_CGROUP "/test-bpf-cgroup-storage-buf/" 16 17 int main(int argc, char **argv) 18 { 19 struct bpf_insn prog[] = { 20 BPF_LD_MAP_FD(BPF_REG_1, 0), /* percpu map fd */ 21 BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */ 22 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 23 BPF_FUNC_get_local_storage), 24 BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0), 25 BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1), 26 BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0), 27 28 BPF_LD_MAP_FD(BPF_REG_1, 0), /* map fd */ 29 BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */ 30 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 31 BPF_FUNC_get_local_storage), 32 BPF_MOV64_IMM(BPF_REG_1, 1), 33 BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0), 34 BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0), 35 BPF_ALU64_IMM(BPF_AND, BPF_REG_1, 0x1), 36 BPF_MOV64_REG(BPF_REG_0, BPF_REG_1), 37 BPF_EXIT_INSN(), 38 }; 39 size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn); 40 int error = EXIT_FAILURE; 41 int map_fd, percpu_map_fd, prog_fd, cgroup_fd; 42 struct bpf_cgroup_storage_key key; 43 unsigned long long value; 44 unsigned long long *percpu_value; 45 int cpu, nproc; 46 47 nproc = get_nprocs_conf(); 48 percpu_value = malloc(sizeof(*percpu_value) * nproc); 49 if (!percpu_value) { 50 printf("Not enough memory for per-cpu area (%d cpus)\n", nproc); 51 goto err; 52 } 53 54 map_fd = bpf_map_create(BPF_MAP_TYPE_CGROUP_STORAGE, NULL, sizeof(key), 55 sizeof(value), 0, NULL); 56 if (map_fd < 0) { 57 printf("Failed to create map: %s\n", strerror(errno)); 58 goto out; 59 } 60 61 percpu_map_fd = bpf_map_create(BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE, NULL, 62 sizeof(key), sizeof(value), 0, NULL); 63 if (percpu_map_fd < 0) { 64 printf("Failed to create map: %s\n", strerror(errno)); 65 goto out; 66 } 67 68 prog[0].imm = percpu_map_fd; 69 prog[7].imm = map_fd; 70 prog_fd = bpf_test_load_program(BPF_PROG_TYPE_CGROUP_SKB, 71 prog, insns_cnt, "GPL", 0, 72 bpf_log_buf, BPF_LOG_BUF_SIZE); 73 if (prog_fd < 0) { 74 printf("Failed to load bpf program: %s\n", bpf_log_buf); 75 goto out; 76 } 77 78 cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); 79 80 /* Attach the bpf program */ 81 if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) { 82 printf("Failed to attach bpf program\n"); 83 goto err; 84 } 85 86 if (bpf_map_get_next_key(map_fd, NULL, &key)) { 87 printf("Failed to get the first key in cgroup storage\n"); 88 goto err; 89 } 90 91 if (bpf_map_lookup_elem(map_fd, &key, &value)) { 92 printf("Failed to lookup cgroup storage 0\n"); 93 goto err; 94 } 95 96 for (cpu = 0; cpu < nproc; cpu++) 97 percpu_value[cpu] = 1000; 98 99 if (bpf_map_update_elem(percpu_map_fd, &key, percpu_value, 0)) { 100 printf("Failed to update the data in the cgroup storage\n"); 101 goto err; 102 } 103 104 /* Every second packet should be dropped */ 105 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 106 assert(system("ping localhost -c 1 -W 1 -q > /dev/null")); 107 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 108 109 /* Check the counter in the cgroup local storage */ 110 if (bpf_map_lookup_elem(map_fd, &key, &value)) { 111 printf("Failed to lookup cgroup storage\n"); 112 goto err; 113 } 114 115 if (value != 3) { 116 printf("Unexpected data in the cgroup storage: %llu\n", value); 117 goto err; 118 } 119 120 /* Bump the counter in the cgroup local storage */ 121 value++; 122 if (bpf_map_update_elem(map_fd, &key, &value, 0)) { 123 printf("Failed to update the data in the cgroup storage\n"); 124 goto err; 125 } 126 127 /* Every second packet should be dropped */ 128 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 129 assert(system("ping localhost -c 1 -W 1 -q > /dev/null")); 130 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0); 131 132 /* Check the final value of the counter in the cgroup local storage */ 133 if (bpf_map_lookup_elem(map_fd, &key, &value)) { 134 printf("Failed to lookup the cgroup storage\n"); 135 goto err; 136 } 137 138 if (value != 7) { 139 printf("Unexpected data in the cgroup storage: %llu\n", value); 140 goto err; 141 } 142 143 /* Check the final value of the counter in the percpu local storage */ 144 145 for (cpu = 0; cpu < nproc; cpu++) 146 percpu_value[cpu] = 0; 147 148 if (bpf_map_lookup_elem(percpu_map_fd, &key, percpu_value)) { 149 printf("Failed to lookup the per-cpu cgroup storage\n"); 150 goto err; 151 } 152 153 value = 0; 154 for (cpu = 0; cpu < nproc; cpu++) 155 value += percpu_value[cpu]; 156 157 if (value != nproc * 1000 + 6) { 158 printf("Unexpected data in the per-cpu cgroup storage\n"); 159 goto err; 160 } 161 162 error = 0; 163 printf("test_cgroup_storage:PASS\n"); 164 165 err: 166 cleanup_cgroup_environment(); 167 free(percpu_value); 168 169 out: 170 return error; 171 } 172