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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020 Facebook */ #define _GNU_SOURCE #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sched.h> #include <net/if.h> #include <linux/compiler.h> #include <bpf/libbpf.h> #include "network_helpers.h" #include "test_progs.h" #include "test_btf_skc_cls_ingress.skel.h" static struct test_btf_skc_cls_ingress *skel; static struct sockaddr_in6 srv_sa6; static __u32 duration; static int prepare_netns(void) { LIBBPF_OPTS(bpf_tc_hook, qdisc_lo, .attach_point = BPF_TC_INGRESS); LIBBPF_OPTS(bpf_tc_opts, tc_attach, .prog_fd = bpf_program__fd(skel->progs.cls_ingress)); if (CHECK(unshare(CLONE_NEWNET), "create netns", "unshare(CLONE_NEWNET): %s (%d)", strerror(errno), errno)) return -1; if (CHECK(system("ip link set dev lo up"), "ip link set dev lo up", "failed\n")) return -1; qdisc_lo.ifindex = if_nametoindex("lo"); if (!ASSERT_OK(bpf_tc_hook_create(&qdisc_lo), "qdisc add dev lo clsact")) return -1; if (!ASSERT_OK(bpf_tc_attach(&qdisc_lo, &tc_attach), "filter add dev lo ingress")) return -1; /* Ensure 20 bytes options (i.e. in total 40 bytes tcp header) for the * bpf_tcp_gen_syncookie() helper. */ if (write_sysctl("/proc/sys/net/ipv4/tcp_window_scaling", "1") || write_sysctl("/proc/sys/net/ipv4/tcp_timestamps", "1") || write_sysctl("/proc/sys/net/ipv4/tcp_sack", "1")) return -1; return 0; } static void reset_test(void) { memset(&skel->bss->srv_sa6, 0, sizeof(skel->bss->srv_sa6)); skel->bss->listen_tp_sport = 0; skel->bss->req_sk_sport = 0; skel->bss->recv_cookie = 0; skel->bss->gen_cookie = 0; skel->bss->linum = 0; } static void print_err_line(void) { if (skel->bss->linum) printf("bpf prog error at line %u\n", skel->bss->linum); } static void test_conn(void) { int listen_fd = -1, cli_fd = -1, srv_fd = -1, err; socklen_t addrlen = sizeof(srv_sa6); int srv_port; if (write_sysctl("/proc/sys/net/ipv4/tcp_syncookies", "1")) return; listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0); if (CHECK_FAIL(listen_fd == -1)) return; err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen); if (CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d\n", err, errno)) goto done; memcpy(&skel->bss->srv_sa6, &srv_sa6, sizeof(srv_sa6)); srv_port = ntohs(srv_sa6.sin6_port); cli_fd = connect_to_fd(listen_fd, 0); if (CHECK_FAIL(cli_fd == -1)) goto done; srv_fd = accept(listen_fd, NULL, NULL); if (CHECK_FAIL(srv_fd == -1)) goto done; if (CHECK(skel->bss->listen_tp_sport != srv_port || skel->bss->req_sk_sport != srv_port, "Unexpected sk src port", "listen_tp_sport:%u req_sk_sport:%u expected:%u\n", skel->bss->listen_tp_sport, skel->bss->req_sk_sport, srv_port)) goto done; if (CHECK(skel->bss->gen_cookie || skel->bss->recv_cookie, "Unexpected syncookie states", "gen_cookie:%u recv_cookie:%u\n", skel->bss->gen_cookie, skel->bss->recv_cookie)) goto done; CHECK(skel->bss->linum, "bpf prog detected error", "at line %u\n", skel->bss->linum); done: if (listen_fd != -1) close(listen_fd); if (cli_fd != -1) close(cli_fd); if (srv_fd != -1) close(srv_fd); } static void test_syncookie(void) { int listen_fd = -1, cli_fd = -1, srv_fd = -1, err; socklen_t addrlen = sizeof(srv_sa6); int srv_port; /* Enforce syncookie mode */ if (write_sysctl("/proc/sys/net/ipv4/tcp_syncookies", "2")) return; listen_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0); if (CHECK_FAIL(listen_fd == -1)) return; err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen); if (CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d\n", err, errno)) goto done; memcpy(&skel->bss->srv_sa6, &srv_sa6, sizeof(srv_sa6)); srv_port = ntohs(srv_sa6.sin6_port); cli_fd = connect_to_fd(listen_fd, 0); if (CHECK_FAIL(cli_fd == -1)) goto done; srv_fd = accept(listen_fd, NULL, NULL); if (CHECK_FAIL(srv_fd == -1)) goto done; if (CHECK(skel->bss->listen_tp_sport != srv_port, "Unexpected tp src port", "listen_tp_sport:%u expected:%u\n", skel->bss->listen_tp_sport, srv_port)) goto done; if (CHECK(skel->bss->req_sk_sport, "Unexpected req_sk src port", "req_sk_sport:%u expected:0\n", skel->bss->req_sk_sport)) goto done; if (CHECK(!skel->bss->gen_cookie || skel->bss->gen_cookie != skel->bss->recv_cookie, "Unexpected syncookie states", "gen_cookie:%u recv_cookie:%u\n", skel->bss->gen_cookie, skel->bss->recv_cookie)) goto done; CHECK(skel->bss->linum, "bpf prog detected error", "at line %u\n", skel->bss->linum); done: if (listen_fd != -1) close(listen_fd); if (cli_fd != -1) close(cli_fd); if (srv_fd != -1) close(srv_fd); } struct test { const char *desc; void (*run)(void); }; #define DEF_TEST(name) { #name, test_##name } static struct test tests[] = { DEF_TEST(conn), DEF_TEST(syncookie), }; void test_btf_skc_cls_ingress(void) { int i; skel = test_btf_skc_cls_ingress__open_and_load(); if (CHECK(!skel, "test_btf_skc_cls_ingress__open_and_load", "failed\n")) return; for (i = 0; i < ARRAY_SIZE(tests); i++) { if (!test__start_subtest(tests[i].desc)) continue; if (prepare_netns()) break; tests[i].run(); print_err_line(); reset_test(); } test_btf_skc_cls_ingress__destroy(skel); } |