diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c b/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c new file mode 100644 index 000000000000..4ce0e8a25bc5 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c @@ -0,0 +1,234 @@ +// 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 <linux/compiler.h> +#include <bpf/libbpf.h> + +#include "network_helpers.h" +#include "test_progs.h" +#include "test_btf_skc_cls_ingress.skel.h" + +struct test_btf_skc_cls_ingress *skel; +struct sockaddr_in6 srv_sa6; +static __u32 duration; + +#define PROG_PIN_FILE "/sys/fs/bpf/btf_skc_cls_ingress" + +static int write_sysctl(const char *sysctl, const char *value) +{ + int fd, err, len; + + fd = open(sysctl, O_WRONLY); + if (CHECK(fd == -1, "open sysctl", "open(%s): %s (%d)\n", + sysctl, strerror(errno), errno)) + return -1; + + len = strlen(value); + err = write(fd, value, len); + close(fd); + if (CHECK(err != len, "write sysctl", + "write(%s, %s, %d): err:%d %s (%d)\n", + sysctl, value, len, err, strerror(errno), errno)) + return -1; + + return 0; +} + +static int prepare_netns(void) +{ + 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; + + if (CHECK(system("tc qdisc add dev lo clsact"), + "tc qdisc add dev lo clsact", "failed\n")) + return -1; + + if (CHECK(system("tc filter add dev lo ingress bpf direct-action object-pinned " PROG_PIN_FILE), + "install tc cls-prog at ingress", "failed\n")) + 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, 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; + + 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); +} + +static void test_syncookie(void) +{ + int listen_fd = -1, cli_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; + + 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); +} + +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, err; + + skel = test_btf_skc_cls_ingress__open_and_load(); + if (CHECK(!skel, "test_btf_skc_cls_ingress__open_and_load", "failed\n")) + return; + + err = bpf_program__pin(skel->progs.cls_ingress, PROG_PIN_FILE); + if (CHECK(err, "bpf_program__pin", + "cannot pin bpf prog to %s. err:%d\n", PROG_PIN_FILE, err)) { + test_btf_skc_cls_ingress__destroy(skel); + 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(); + } + + bpf_program__unpin(skel->progs.cls_ingress, PROG_PIN_FILE); + test_btf_skc_cls_ingress__destroy(skel); +} |