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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 | // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2023 Isovalent */ #include <uapi/linux/if_link.h> #include <test_progs.h> #include <netinet/tcp.h> #include <netinet/udp.h> #include "network_helpers.h" #include "test_assign_reuse.skel.h" #define NS_TEST "assign_reuse" #define LOOPBACK 1 #define PORT 4443 static int attach_reuseport(int sock_fd, int prog_fd) { return setsockopt(sock_fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &prog_fd, sizeof(prog_fd)); } static __u64 cookie(int fd) { __u64 cookie = 0; socklen_t cookie_len = sizeof(cookie); int ret; ret = getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len); ASSERT_OK(ret, "cookie"); ASSERT_GT(cookie, 0, "cookie_invalid"); return cookie; } static int echo_test_udp(int fd_sv) { struct sockaddr_storage addr = {}; socklen_t len = sizeof(addr); char buff[1] = {}; int fd_cl = -1, ret; fd_cl = connect_to_fd(fd_sv, 100); ASSERT_GT(fd_cl, 0, "create_client"); ASSERT_EQ(getsockname(fd_cl, (void *)&addr, &len), 0, "getsockname"); ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client"); ret = recv(fd_sv, buff, sizeof(buff), 0); if (ret < 0) { close(fd_cl); return errno; } ASSERT_EQ(ret, 1, "recv_server"); ASSERT_EQ(sendto(fd_sv, buff, sizeof(buff), 0, (void *)&addr, len), 1, "send_server"); ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client"); close(fd_cl); return 0; } static int echo_test_tcp(int fd_sv) { char buff[1] = {}; int fd_cl = -1, fd_sv_cl = -1; fd_cl = connect_to_fd(fd_sv, 100); if (fd_cl < 0) return errno; fd_sv_cl = accept(fd_sv, NULL, NULL); ASSERT_GE(fd_sv_cl, 0, "accept_fd"); ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client"); ASSERT_EQ(recv(fd_sv_cl, buff, sizeof(buff), 0), 1, "recv_server"); ASSERT_EQ(send(fd_sv_cl, buff, sizeof(buff), 0), 1, "send_server"); ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client"); close(fd_sv_cl); close(fd_cl); return 0; } void run_assign_reuse(int family, int sotype, const char *ip, __u16 port) { DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook, .ifindex = LOOPBACK, .attach_point = BPF_TC_INGRESS, ); DECLARE_LIBBPF_OPTS(bpf_tc_opts, tc_opts, .handle = 1, .priority = 1, ); bool hook_created = false, tc_attached = false; int ret, fd_tc, fd_accept, fd_drop, fd_map; int *fd_sv = NULL; __u64 fd_val; struct test_assign_reuse *skel; const int zero = 0; skel = test_assign_reuse__open(); if (!ASSERT_OK_PTR(skel, "skel_open")) goto cleanup; skel->rodata->dest_port = port; ret = test_assign_reuse__load(skel); if (!ASSERT_OK(ret, "skel_load")) goto cleanup; ASSERT_EQ(skel->bss->sk_cookie_seen, 0, "cookie_init"); fd_tc = bpf_program__fd(skel->progs.tc_main); fd_accept = bpf_program__fd(skel->progs.reuse_accept); fd_drop = bpf_program__fd(skel->progs.reuse_drop); fd_map = bpf_map__fd(skel->maps.sk_map); fd_sv = start_reuseport_server(family, sotype, ip, port, 100, 1); if (!ASSERT_NEQ(fd_sv, NULL, "start_reuseport_server")) goto cleanup; ret = attach_reuseport(*fd_sv, fd_drop); if (!ASSERT_OK(ret, "attach_reuseport")) goto cleanup; fd_val = *fd_sv; ret = bpf_map_update_elem(fd_map, &zero, &fd_val, BPF_NOEXIST); if (!ASSERT_OK(ret, "bpf_sk_map")) goto cleanup; ret = bpf_tc_hook_create(&tc_hook); if (ret == 0) hook_created = true; ret = ret == -EEXIST ? 0 : ret; if (!ASSERT_OK(ret, "bpf_tc_hook_create")) goto cleanup; tc_opts.prog_fd = fd_tc; ret = bpf_tc_attach(&tc_hook, &tc_opts); if (!ASSERT_OK(ret, "bpf_tc_attach")) goto cleanup; tc_attached = true; if (sotype == SOCK_STREAM) ASSERT_EQ(echo_test_tcp(*fd_sv), ECONNREFUSED, "drop_tcp"); else ASSERT_EQ(echo_test_udp(*fd_sv), EAGAIN, "drop_udp"); ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once"); skel->bss->sk_cookie_seen = 0; skel->bss->reuseport_executed = 0; ASSERT_OK(attach_reuseport(*fd_sv, fd_accept), "attach_reuseport(accept)"); if (sotype == SOCK_STREAM) ASSERT_EQ(echo_test_tcp(*fd_sv), 0, "echo_tcp"); else ASSERT_EQ(echo_test_udp(*fd_sv), 0, "echo_udp"); ASSERT_EQ(skel->bss->sk_cookie_seen, cookie(*fd_sv), "cookie_mismatch"); ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once"); cleanup: if (tc_attached) { tc_opts.flags = tc_opts.prog_fd = tc_opts.prog_id = 0; ret = bpf_tc_detach(&tc_hook, &tc_opts); ASSERT_OK(ret, "bpf_tc_detach"); } if (hook_created) { tc_hook.attach_point = BPF_TC_INGRESS | BPF_TC_EGRESS; bpf_tc_hook_destroy(&tc_hook); } test_assign_reuse__destroy(skel); free_fds(fd_sv, 1); } void test_assign_reuse(void) { struct nstoken *tok = NULL; SYS(out, "ip netns add %s", NS_TEST); SYS(cleanup, "ip -net %s link set dev lo up", NS_TEST); tok = open_netns(NS_TEST); if (!ASSERT_OK_PTR(tok, "netns token")) return; if (test__start_subtest("tcpv4")) run_assign_reuse(AF_INET, SOCK_STREAM, "127.0.0.1", PORT); if (test__start_subtest("tcpv6")) run_assign_reuse(AF_INET6, SOCK_STREAM, "::1", PORT); if (test__start_subtest("udpv4")) run_assign_reuse(AF_INET, SOCK_DGRAM, "127.0.0.1", PORT); if (test__start_subtest("udpv6")) run_assign_reuse(AF_INET6, SOCK_DGRAM, "::1", PORT); cleanup: close_netns(tok); SYS_NOFAIL("ip netns delete %s", NS_TEST); out: return; } |