// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* * This test sets up 3 netns (src <-> fwd <-> dst). There is no direct veth link * between src and dst. The netns fwd has veth links to each src and dst. The * client is in src and server in dst. The test installs a TC BPF program to each * host facing veth in fwd which calls into i) bpf_redirect_neigh() to perform the * neigh addr population and redirect or ii) bpf_redirect_peer() for namespace * switch from ingress side; it also installs a checker prog on the egress side * to drop unexpected traffic. */ #include <arpa/inet.h> #include <linux/if_tun.h> #include <linux/limits.h> #include <linux/sysctl.h> #include <linux/time_types.h> #include <linux/net_tstamp.h> #include <net/if.h> #include <stdbool.h> #include <stdio.h> #include <sys/stat.h> #include <unistd.h> #include "test_progs.h" #include "network_helpers.h" #include "test_tc_neigh_fib.skel.h" #include "test_tc_neigh.skel.h" #include "test_tc_peer.skel.h" #include "test_tc_dtime.skel.h" #ifndef TCP_TX_DELAY #define TCP_TX_DELAY 37 #endif #define NS_SRC "ns_src" #define NS_FWD "ns_fwd" #define NS_DST "ns_dst" #define IP4_SRC "172.16.1.100" #define IP4_DST "172.16.2.100" #define IP4_TUN_SRC "172.17.1.100" #define IP4_TUN_FWD "172.17.1.200" #define IP4_PORT 9004 #define IP6_SRC "0::1:dead:beef:cafe" #define IP6_DST "0::2:dead:beef:cafe" #define IP6_TUN_SRC "1::1:dead:beef:cafe" #define IP6_TUN_FWD "1::2:dead:beef:cafe" #define IP6_PORT 9006 #define IP4_SLL "169.254.0.1" #define IP4_DLL "169.254.0.2" #define IP4_NET "169.254.0.0" #define MAC_DST_FWD "00:11:22:33:44:55" #define MAC_DST "00:22:33:44:55:66" #define IFADDR_STR_LEN 18 #define PING_ARGS "-i 0.2 -c 3 -w 10 -q" #define TIMEOUT_MILLIS 10000 #define NSEC_PER_SEC 1000000000ULL #define log_err(MSG, ...) \ fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \ __FILE__, __LINE__, strerror(errno), ##__VA_ARGS__) static const char * const namespaces[] = {NS_SRC, NS_FWD, NS_DST, NULL}; static int write_file(const char *path, const char *newval) { FILE *f; f = fopen(path, "r+"); if (!f) return -1; if (fwrite(newval, strlen(newval), 1, f) != 1) { log_err("writing to %s failed", path); fclose(f); return -1; } fclose(f); return 0; } static int netns_setup_namespaces(const char *verb) { const char * const *ns = namespaces; char cmd[128]; while (*ns) { snprintf(cmd, sizeof(cmd), "ip netns %s %s", verb, *ns); if (!ASSERT_OK(system(cmd), cmd)) return -1; ns++; } return 0; } static void netns_setup_namespaces_nofail(const char *verb) { const char * const *ns = namespaces; char cmd[128]; while (*ns) { snprintf(cmd, sizeof(cmd), "ip netns %s %s > /dev/null 2>&1", verb, *ns); system(cmd); ns++; } } struct netns_setup_result { int ifindex_veth_src; int ifindex_veth_src_fwd; int ifindex_veth_dst; int ifindex_veth_dst_fwd; }; static int get_ifaddr(const char *name, char *ifaddr) { char path[PATH_MAX]; FILE *f; int ret; snprintf(path, PATH_MAX, "/sys/class/net/%s/address", name); f = fopen(path, "r"); if (!ASSERT_OK_PTR(f, path)) return -1; ret = fread(ifaddr, 1, IFADDR_STR_LEN, f); if (!ASSERT_EQ(ret, IFADDR_STR_LEN, "fread ifaddr")) { fclose(f); return -1; } fclose(f); return 0; } static int netns_setup_links_and_routes(struct netns_setup_result *result) { struct nstoken *nstoken = NULL; char veth_src_fwd_addr[IFADDR_STR_LEN+1] = {}; SYS(fail, "ip link add veth_src type veth peer name veth_src_fwd"); SYS(fail, "ip link add veth_dst type veth peer name veth_dst_fwd"); SYS(fail, "ip link set veth_dst_fwd address " MAC_DST_FWD); SYS(fail, "ip link set veth_dst address " MAC_DST); if (get_ifaddr("veth_src_fwd", veth_src_fwd_addr)) goto fail; result->ifindex_veth_src = if_nametoindex("veth_src"); if (!ASSERT_GT(result->ifindex_veth_src, 0, "ifindex_veth_src")) goto fail; result->ifindex_veth_src_fwd = if_nametoindex("veth_src_fwd"); if (!ASSERT_GT(result->ifindex_veth_src_fwd, 0, "ifindex_veth_src_fwd")) goto fail; result->ifindex_veth_dst = if_nametoindex("veth_dst"); if (!ASSERT_GT(result->ifindex_veth_dst, 0, "ifindex_veth_dst")) goto fail; result->ifindex_veth_dst_fwd = if_nametoindex("veth_dst_fwd"); if (!ASSERT_GT(result->ifindex_veth_dst_fwd, 0, "ifindex_veth_dst_fwd")) goto fail; SYS(fail, "ip link set veth_src netns " NS_SRC); SYS(fail, "ip link set veth_src_fwd netns " NS_FWD); SYS(fail, "ip link set veth_dst_fwd netns " NS_FWD); SYS(fail, "ip link set veth_dst netns " NS_DST); /** setup in 'src' namespace */ nstoken = open_netns(NS_SRC); if (!ASSERT_OK_PTR(nstoken, "setns src")) goto fail; SYS(fail, "ip addr add " IP4_SRC "/32 dev veth_src"); SYS(fail, "ip addr add " IP6_SRC "/128 dev veth_src nodad"); SYS(fail, "ip link set dev veth_src up"); SYS(fail, "ip route add " IP4_DST "/32 dev veth_src scope global"); SYS(fail, "ip route add " IP4_NET "/16 dev veth_src scope global"); SYS(fail, "ip route add " IP6_DST "/128 dev veth_src scope global"); SYS(fail, "ip neigh add " IP4_DST " dev veth_src lladdr %s", veth_src_fwd_addr); SYS(fail, "ip neigh add " IP6_DST " dev veth_src lladdr %s", veth_src_fwd_addr); close_netns(nstoken); /** setup in 'fwd' namespace */ nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns fwd")) goto fail; /* The fwd netns automatically gets a v6 LL address / routes, but also * needs v4 one in order to start ARP probing. IP4_NET route is added * to the endpoints so that the ARP processing will reply. */ SYS(fail, "ip addr add " IP4_SLL "/32 dev veth_src_fwd"); SYS(fail, "ip addr add " IP4_DLL "/32 dev veth_dst_fwd"); SYS(fail, "ip link set dev veth_src_fwd up"); SYS(fail, "ip link set dev veth_dst_fwd up"); SYS(fail, "ip route add " IP4_SRC "/32 dev veth_src_fwd scope global"); SYS(fail, "ip route add " IP6_SRC "/128 dev veth_src_fwd scope global"); SYS(fail, "ip route add " IP4_DST "/32 dev veth_dst_fwd scope global"); SYS(fail, "ip route add " IP6_DST "/128 dev veth_dst_fwd scope global"); close_netns(nstoken); /** setup in 'dst' namespace */ nstoken = open_netns(NS_DST); if (!ASSERT_OK_PTR(nstoken, "setns dst")) goto fail; SYS(fail, "ip addr add " IP4_DST "/32 dev veth_dst"); SYS(fail, "ip addr add " IP6_DST "/128 dev veth_dst nodad"); SYS(fail, "ip link set dev veth_dst up"); SYS(fail, "ip route add " IP4_SRC "/32 dev veth_dst scope global"); SYS(fail, "ip route add " IP4_NET "/16 dev veth_dst scope global"); SYS(fail, "ip route add " IP6_SRC "/128 dev veth_dst scope global"); SYS(fail, "ip neigh add " IP4_SRC " dev veth_dst lladdr " MAC_DST_FWD); SYS(fail, "ip neigh add " IP6_SRC " dev veth_dst lladdr " MAC_DST_FWD); close_netns(nstoken); return 0; fail: if (nstoken) close_netns(nstoken); return -1; } static int qdisc_clsact_create(struct bpf_tc_hook *qdisc_hook, int ifindex) { char err_str[128], ifname[16]; int err; qdisc_hook->ifindex = ifindex; qdisc_hook->attach_point = BPF_TC_INGRESS | BPF_TC_EGRESS; err = bpf_tc_hook_create(qdisc_hook); snprintf(err_str, sizeof(err_str), "qdisc add dev %s clsact", if_indextoname(qdisc_hook->ifindex, ifname) ? : "<unknown_iface>"); err_str[sizeof(err_str) - 1] = 0; ASSERT_OK(err, err_str); return err; } static int xgress_filter_add(struct bpf_tc_hook *qdisc_hook, enum bpf_tc_attach_point xgress, const struct bpf_program *prog, int priority) { LIBBPF_OPTS(bpf_tc_opts, tc_attach); char err_str[128], ifname[16]; int err; qdisc_hook->attach_point = xgress; tc_attach.prog_fd = bpf_program__fd(prog); tc_attach.priority = priority; err = bpf_tc_attach(qdisc_hook, &tc_attach); snprintf(err_str, sizeof(err_str), "filter add dev %s %s prio %d bpf da %s", if_indextoname(qdisc_hook->ifindex, ifname) ? : "<unknown_iface>", xgress == BPF_TC_INGRESS ? "ingress" : "egress", priority, bpf_program__name(prog)); err_str[sizeof(err_str) - 1] = 0; ASSERT_OK(err, err_str); return err; } #define QDISC_CLSACT_CREATE(qdisc_hook, ifindex) ({ \ if ((err = qdisc_clsact_create(qdisc_hook, ifindex))) \ goto fail; \ }) #define XGRESS_FILTER_ADD(qdisc_hook, xgress, prog, priority) ({ \ if ((err = xgress_filter_add(qdisc_hook, xgress, prog, priority))) \ goto fail; \ }) static int netns_load_bpf(const struct bpf_program *src_prog, const struct bpf_program *dst_prog, const struct bpf_program *chk_prog, const struct netns_setup_result *setup_result) { LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_src_fwd); LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_dst_fwd); int err; /* tc qdisc add dev veth_src_fwd clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_src_fwd, setup_result->ifindex_veth_src_fwd); /* tc filter add dev veth_src_fwd ingress bpf da src_prog */ XGRESS_FILTER_ADD(&qdisc_veth_src_fwd, BPF_TC_INGRESS, src_prog, 0); /* tc filter add dev veth_src_fwd egress bpf da chk_prog */ XGRESS_FILTER_ADD(&qdisc_veth_src_fwd, BPF_TC_EGRESS, chk_prog, 0); /* tc qdisc add dev veth_dst_fwd clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_dst_fwd, setup_result->ifindex_veth_dst_fwd); /* tc filter add dev veth_dst_fwd ingress bpf da dst_prog */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_INGRESS, dst_prog, 0); /* tc filter add dev veth_dst_fwd egress bpf da chk_prog */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_EGRESS, chk_prog, 0); return 0; fail: return -1; } static void test_tcp(int family, const char *addr, __u16 port) { int listen_fd = -1, accept_fd = -1, client_fd = -1; char buf[] = "testing testing"; int n; struct nstoken *nstoken; nstoken = open_netns(NS_DST); if (!ASSERT_OK_PTR(nstoken, "setns dst")) return; listen_fd = start_server(family, SOCK_STREAM, addr, port, 0); if (!ASSERT_GE(listen_fd, 0, "listen")) goto done; close_netns(nstoken); nstoken = open_netns(NS_SRC); if (!ASSERT_OK_PTR(nstoken, "setns src")) goto done; client_fd = connect_to_fd(listen_fd, TIMEOUT_MILLIS); if (!ASSERT_GE(client_fd, 0, "connect_to_fd")) goto done; accept_fd = accept(listen_fd, NULL, NULL); if (!ASSERT_GE(accept_fd, 0, "accept")) goto done; if (!ASSERT_OK(settimeo(accept_fd, TIMEOUT_MILLIS), "settimeo")) goto done; n = write(client_fd, buf, sizeof(buf)); if (!ASSERT_EQ(n, sizeof(buf), "send to server")) goto done; n = read(accept_fd, buf, sizeof(buf)); ASSERT_EQ(n, sizeof(buf), "recv from server"); done: if (nstoken) close_netns(nstoken); if (listen_fd >= 0) close(listen_fd); if (accept_fd >= 0) close(accept_fd); if (client_fd >= 0) close(client_fd); } static int test_ping(int family, const char *addr) { SYS(fail, "ip netns exec " NS_SRC " %s " PING_ARGS " %s > /dev/null", ping_command(family), addr); return 0; fail: return -1; } static void test_connectivity(void) { test_tcp(AF_INET, IP4_DST, IP4_PORT); test_ping(AF_INET, IP4_DST); test_tcp(AF_INET6, IP6_DST, IP6_PORT); test_ping(AF_INET6, IP6_DST); } static int set_forwarding(bool enable) { int err; err = write_file("/proc/sys/net/ipv4/ip_forward", enable ? "1" : "0"); if (!ASSERT_OK(err, "set ipv4.ip_forward=0")) return err; err = write_file("/proc/sys/net/ipv6/conf/all/forwarding", enable ? "1" : "0"); if (!ASSERT_OK(err, "set ipv6.forwarding=0")) return err; return 0; } static void rcv_tstamp(int fd, const char *expected, size_t s) { struct __kernel_timespec pkt_ts = {}; char ctl[CMSG_SPACE(sizeof(pkt_ts))]; struct timespec now_ts; struct msghdr msg = {}; __u64 now_ns, pkt_ns; struct cmsghdr *cmsg; struct iovec iov; char data[32]; int ret; iov.iov_base = data; iov.iov_len = sizeof(data); msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_control = &ctl; msg.msg_controllen = sizeof(ctl); ret = recvmsg(fd, &msg, 0); if (!ASSERT_EQ(ret, s, "recvmsg")) return; ASSERT_STRNEQ(data, expected, s, "expected rcv data"); cmsg = CMSG_FIRSTHDR(&msg); if (cmsg && cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMPNS_NEW) memcpy(&pkt_ts, CMSG_DATA(cmsg), sizeof(pkt_ts)); pkt_ns = pkt_ts.tv_sec * NSEC_PER_SEC + pkt_ts.tv_nsec; ASSERT_NEQ(pkt_ns, 0, "pkt rcv tstamp"); ret = clock_gettime(CLOCK_REALTIME, &now_ts); ASSERT_OK(ret, "clock_gettime"); now_ns = now_ts.tv_sec * NSEC_PER_SEC + now_ts.tv_nsec; if (ASSERT_GE(now_ns, pkt_ns, "check rcv tstamp")) ASSERT_LT(now_ns - pkt_ns, 5 * NSEC_PER_SEC, "check rcv tstamp"); } static void snd_tstamp(int fd, char *b, size_t s) { struct sock_txtime opt = { .clockid = CLOCK_TAI }; char ctl[CMSG_SPACE(sizeof(__u64))]; struct timespec now_ts; struct msghdr msg = {}; struct cmsghdr *cmsg; struct iovec iov; __u64 now_ns; int ret; ret = clock_gettime(CLOCK_TAI, &now_ts); ASSERT_OK(ret, "clock_get_time(CLOCK_TAI)"); now_ns = now_ts.tv_sec * NSEC_PER_SEC + now_ts.tv_nsec; iov.iov_base = b; iov.iov_len = s; msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_control = &ctl; msg.msg_controllen = sizeof(ctl); cmsg = CMSG_FIRSTHDR(&msg); cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = SCM_TXTIME; cmsg->cmsg_len = CMSG_LEN(sizeof(now_ns)); *(__u64 *)CMSG_DATA(cmsg) = now_ns; ret = setsockopt(fd, SOL_SOCKET, SO_TXTIME, &opt, sizeof(opt)); ASSERT_OK(ret, "setsockopt(SO_TXTIME)"); ret = sendmsg(fd, &msg, 0); ASSERT_EQ(ret, s, "sendmsg"); } static void test_inet_dtime(int family, int type, const char *addr, __u16 port) { int opt = 1, accept_fd = -1, client_fd = -1, listen_fd, err; char buf[] = "testing testing"; struct nstoken *nstoken; nstoken = open_netns(NS_DST); if (!ASSERT_OK_PTR(nstoken, "setns dst")) return; listen_fd = start_server(family, type, addr, port, 0); close_netns(nstoken); if (!ASSERT_GE(listen_fd, 0, "listen")) return; /* Ensure the kernel puts the (rcv) timestamp for all skb */ err = setsockopt(listen_fd, SOL_SOCKET, SO_TIMESTAMPNS_NEW, &opt, sizeof(opt)); if (!ASSERT_OK(err, "setsockopt(SO_TIMESTAMPNS_NEW)")) goto done; if (type == SOCK_STREAM) { /* Ensure the kernel set EDT when sending out rst/ack * from the kernel's ctl_sk. */ err = setsockopt(listen_fd, SOL_TCP, TCP_TX_DELAY, &opt, sizeof(opt)); if (!ASSERT_OK(err, "setsockopt(TCP_TX_DELAY)")) goto done; } nstoken = open_netns(NS_SRC); if (!ASSERT_OK_PTR(nstoken, "setns src")) goto done; client_fd = connect_to_fd(listen_fd, TIMEOUT_MILLIS); close_netns(nstoken); if (!ASSERT_GE(client_fd, 0, "connect_to_fd")) goto done; if (type == SOCK_STREAM) { int n; accept_fd = accept(listen_fd, NULL, NULL); if (!ASSERT_GE(accept_fd, 0, "accept")) goto done; n = write(client_fd, buf, sizeof(buf)); if (!ASSERT_EQ(n, sizeof(buf), "send to server")) goto done; rcv_tstamp(accept_fd, buf, sizeof(buf)); } else { snd_tstamp(client_fd, buf, sizeof(buf)); rcv_tstamp(listen_fd, buf, sizeof(buf)); } done: close(listen_fd); if (accept_fd != -1) close(accept_fd); if (client_fd != -1) close(client_fd); } static int netns_load_dtime_bpf(struct test_tc_dtime *skel, const struct netns_setup_result *setup_result) { LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_src_fwd); LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_dst_fwd); LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_src); LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_dst); struct nstoken *nstoken; int err; /* setup ns_src tc progs */ nstoken = open_netns(NS_SRC); if (!ASSERT_OK_PTR(nstoken, "setns " NS_SRC)) return -1; /* tc qdisc add dev veth_src clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_src, setup_result->ifindex_veth_src); /* tc filter add dev veth_src ingress bpf da ingress_host */ XGRESS_FILTER_ADD(&qdisc_veth_src, BPF_TC_INGRESS, skel->progs.ingress_host, 0); /* tc filter add dev veth_src egress bpf da egress_host */ XGRESS_FILTER_ADD(&qdisc_veth_src, BPF_TC_EGRESS, skel->progs.egress_host, 0); close_netns(nstoken); /* setup ns_dst tc progs */ nstoken = open_netns(NS_DST); if (!ASSERT_OK_PTR(nstoken, "setns " NS_DST)) return -1; /* tc qdisc add dev veth_dst clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_dst, setup_result->ifindex_veth_dst); /* tc filter add dev veth_dst ingress bpf da ingress_host */ XGRESS_FILTER_ADD(&qdisc_veth_dst, BPF_TC_INGRESS, skel->progs.ingress_host, 0); /* tc filter add dev veth_dst egress bpf da egress_host */ XGRESS_FILTER_ADD(&qdisc_veth_dst, BPF_TC_EGRESS, skel->progs.egress_host, 0); close_netns(nstoken); /* setup ns_fwd tc progs */ nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns " NS_FWD)) return -1; /* tc qdisc add dev veth_dst_fwd clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_dst_fwd, setup_result->ifindex_veth_dst_fwd); /* tc filter add dev veth_dst_fwd ingress prio 100 bpf da ingress_fwdns_prio100 */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_INGRESS, skel->progs.ingress_fwdns_prio100, 100); /* tc filter add dev veth_dst_fwd ingress prio 101 bpf da ingress_fwdns_prio101 */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_INGRESS, skel->progs.ingress_fwdns_prio101, 101); /* tc filter add dev veth_dst_fwd egress prio 100 bpf da egress_fwdns_prio100 */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_EGRESS, skel->progs.egress_fwdns_prio100, 100); /* tc filter add dev veth_dst_fwd egress prio 101 bpf da egress_fwdns_prio101 */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_EGRESS, skel->progs.egress_fwdns_prio101, 101); /* tc qdisc add dev veth_src_fwd clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_src_fwd, setup_result->ifindex_veth_src_fwd); /* tc filter add dev veth_src_fwd ingress prio 100 bpf da ingress_fwdns_prio100 */ XGRESS_FILTER_ADD(&qdisc_veth_src_fwd, BPF_TC_INGRESS, skel->progs.ingress_fwdns_prio100, 100); /* tc filter add dev veth_src_fwd ingress prio 101 bpf da ingress_fwdns_prio101 */ XGRESS_FILTER_ADD(&qdisc_veth_src_fwd, BPF_TC_INGRESS, skel->progs.ingress_fwdns_prio101, 101); /* tc filter add dev veth_src_fwd egress prio 100 bpf da egress_fwdns_prio100 */ XGRESS_FILTER_ADD(&qdisc_veth_src_fwd, BPF_TC_EGRESS, skel->progs.egress_fwdns_prio100, 100); /* tc filter add dev veth_src_fwd egress prio 101 bpf da egress_fwdns_prio101 */ XGRESS_FILTER_ADD(&qdisc_veth_src_fwd, BPF_TC_EGRESS, skel->progs.egress_fwdns_prio101, 101); close_netns(nstoken); return 0; fail: close_netns(nstoken); return err; } enum { INGRESS_FWDNS_P100, INGRESS_FWDNS_P101, EGRESS_FWDNS_P100, EGRESS_FWDNS_P101, INGRESS_ENDHOST, EGRESS_ENDHOST, SET_DTIME, __MAX_CNT, }; const char *cnt_names[] = { "ingress_fwdns_p100", "ingress_fwdns_p101", "egress_fwdns_p100", "egress_fwdns_p101", "ingress_endhost", "egress_endhost", "set_dtime", }; enum { TCP_IP6_CLEAR_DTIME, TCP_IP4, TCP_IP6, UDP_IP4, UDP_IP6, TCP_IP4_RT_FWD, TCP_IP6_RT_FWD, UDP_IP4_RT_FWD, UDP_IP6_RT_FWD, UKN_TEST, __NR_TESTS, }; const char *test_names[] = { "tcp ip6 clear dtime", "tcp ip4", "tcp ip6", "udp ip4", "udp ip6", "tcp ip4 rt fwd", "tcp ip6 rt fwd", "udp ip4 rt fwd", "udp ip6 rt fwd", }; static const char *dtime_cnt_str(int test, int cnt) { static char name[64]; snprintf(name, sizeof(name), "%s %s", test_names[test], cnt_names[cnt]); return name; } static const char *dtime_err_str(int test, int cnt) { static char name[64]; snprintf(name, sizeof(name), "%s %s errs", test_names[test], cnt_names[cnt]); return name; } static void test_tcp_clear_dtime(struct test_tc_dtime *skel) { int i, t = TCP_IP6_CLEAR_DTIME; __u32 *dtimes = skel->bss->dtimes[t]; __u32 *errs = skel->bss->errs[t]; skel->bss->test = t; test_inet_dtime(AF_INET6, SOCK_STREAM, IP6_DST, 50000 + t); ASSERT_EQ(dtimes[INGRESS_FWDNS_P100], 0, dtime_cnt_str(t, INGRESS_FWDNS_P100)); ASSERT_EQ(dtimes[INGRESS_FWDNS_P101], 0, dtime_cnt_str(t, INGRESS_FWDNS_P101)); ASSERT_GT(dtimes[EGRESS_FWDNS_P100], 0, dtime_cnt_str(t, EGRESS_FWDNS_P100)); ASSERT_EQ(dtimes[EGRESS_FWDNS_P101], 0, dtime_cnt_str(t, EGRESS_FWDNS_P101)); ASSERT_GT(dtimes[EGRESS_ENDHOST], 0, dtime_cnt_str(t, EGRESS_ENDHOST)); ASSERT_GT(dtimes[INGRESS_ENDHOST], 0, dtime_cnt_str(t, INGRESS_ENDHOST)); for (i = INGRESS_FWDNS_P100; i < __MAX_CNT; i++) ASSERT_EQ(errs[i], 0, dtime_err_str(t, i)); } static void test_tcp_dtime(struct test_tc_dtime *skel, int family, bool bpf_fwd) { __u32 *dtimes, *errs; const char *addr; int i, t; if (family == AF_INET) { t = bpf_fwd ? TCP_IP4 : TCP_IP4_RT_FWD; addr = IP4_DST; } else { t = bpf_fwd ? TCP_IP6 : TCP_IP6_RT_FWD; addr = IP6_DST; } dtimes = skel->bss->dtimes[t]; errs = skel->bss->errs[t]; skel->bss->test = t; test_inet_dtime(family, SOCK_STREAM, addr, 50000 + t); /* fwdns_prio100 prog does not read delivery_time_type, so * kernel puts the (rcv) timetamp in __sk_buff->tstamp */ ASSERT_EQ(dtimes[INGRESS_FWDNS_P100], 0, dtime_cnt_str(t, INGRESS_FWDNS_P100)); for (i = INGRESS_FWDNS_P101; i < SET_DTIME; i++) ASSERT_GT(dtimes[i], 0, dtime_cnt_str(t, i)); for (i = INGRESS_FWDNS_P100; i < __MAX_CNT; i++) ASSERT_EQ(errs[i], 0, dtime_err_str(t, i)); } static void test_udp_dtime(struct test_tc_dtime *skel, int family, bool bpf_fwd) { __u32 *dtimes, *errs; const char *addr; int i, t; if (family == AF_INET) { t = bpf_fwd ? UDP_IP4 : UDP_IP4_RT_FWD; addr = IP4_DST; } else { t = bpf_fwd ? UDP_IP6 : UDP_IP6_RT_FWD; addr = IP6_DST; } dtimes = skel->bss->dtimes[t]; errs = skel->bss->errs[t]; skel->bss->test = t; test_inet_dtime(family, SOCK_DGRAM, addr, 50000 + t); ASSERT_EQ(dtimes[INGRESS_FWDNS_P100], 0, dtime_cnt_str(t, INGRESS_FWDNS_P100)); /* non mono delivery time is not forwarded */ ASSERT_EQ(dtimes[INGRESS_FWDNS_P101], 0, dtime_cnt_str(t, INGRESS_FWDNS_P101)); for (i = EGRESS_FWDNS_P100; i < SET_DTIME; i++) ASSERT_GT(dtimes[i], 0, dtime_cnt_str(t, i)); for (i = INGRESS_FWDNS_P100; i < __MAX_CNT; i++) ASSERT_EQ(errs[i], 0, dtime_err_str(t, i)); } static void test_tc_redirect_dtime(struct netns_setup_result *setup_result) { struct test_tc_dtime *skel; struct nstoken *nstoken; int err; skel = test_tc_dtime__open(); if (!ASSERT_OK_PTR(skel, "test_tc_dtime__open")) return; skel->rodata->IFINDEX_SRC = setup_result->ifindex_veth_src_fwd; skel->rodata->IFINDEX_DST = setup_result->ifindex_veth_dst_fwd; err = test_tc_dtime__load(skel); if (!ASSERT_OK(err, "test_tc_dtime__load")) goto done; if (netns_load_dtime_bpf(skel, setup_result)) goto done; nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns fwd")) goto done; err = set_forwarding(false); close_netns(nstoken); if (!ASSERT_OK(err, "disable forwarding")) goto done; test_tcp_clear_dtime(skel); test_tcp_dtime(skel, AF_INET, true); test_tcp_dtime(skel, AF_INET6, true); test_udp_dtime(skel, AF_INET, true); test_udp_dtime(skel, AF_INET6, true); /* Test the kernel ip[6]_forward path instead * of bpf_redirect_neigh(). */ nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns fwd")) goto done; err = set_forwarding(true); close_netns(nstoken); if (!ASSERT_OK(err, "enable forwarding")) goto done; test_tcp_dtime(skel, AF_INET, false); test_tcp_dtime(skel, AF_INET6, false); test_udp_dtime(skel, AF_INET, false); test_udp_dtime(skel, AF_INET6, false); done: test_tc_dtime__destroy(skel); } static void test_tc_redirect_neigh_fib(struct netns_setup_result *setup_result) { struct nstoken *nstoken = NULL; struct test_tc_neigh_fib *skel = NULL; nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns fwd")) return; skel = test_tc_neigh_fib__open(); if (!ASSERT_OK_PTR(skel, "test_tc_neigh_fib__open")) goto done; if (!ASSERT_OK(test_tc_neigh_fib__load(skel), "test_tc_neigh_fib__load")) goto done; if (netns_load_bpf(skel->progs.tc_src, skel->progs.tc_dst, skel->progs.tc_chk, setup_result)) goto done; /* bpf_fib_lookup() checks if forwarding is enabled */ if (!ASSERT_OK(set_forwarding(true), "enable forwarding")) goto done; test_connectivity(); done: if (skel) test_tc_neigh_fib__destroy(skel); close_netns(nstoken); } static void test_tc_redirect_neigh(struct netns_setup_result *setup_result) { struct nstoken *nstoken = NULL; struct test_tc_neigh *skel = NULL; int err; nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns fwd")) return; skel = test_tc_neigh__open(); if (!ASSERT_OK_PTR(skel, "test_tc_neigh__open")) goto done; skel->rodata->IFINDEX_SRC = setup_result->ifindex_veth_src_fwd; skel->rodata->IFINDEX_DST = setup_result->ifindex_veth_dst_fwd; err = test_tc_neigh__load(skel); if (!ASSERT_OK(err, "test_tc_neigh__load")) goto done; if (netns_load_bpf(skel->progs.tc_src, skel->progs.tc_dst, skel->progs.tc_chk, setup_result)) goto done; if (!ASSERT_OK(set_forwarding(false), "disable forwarding")) goto done; test_connectivity(); done: if (skel) test_tc_neigh__destroy(skel); close_netns(nstoken); } static void test_tc_redirect_peer(struct netns_setup_result *setup_result) { struct nstoken *nstoken; struct test_tc_peer *skel; int err; nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns fwd")) return; skel = test_tc_peer__open(); if (!ASSERT_OK_PTR(skel, "test_tc_peer__open")) goto done; skel->rodata->IFINDEX_SRC = setup_result->ifindex_veth_src_fwd; skel->rodata->IFINDEX_DST = setup_result->ifindex_veth_dst_fwd; err = test_tc_peer__load(skel); if (!ASSERT_OK(err, "test_tc_peer__load")) goto done; if (netns_load_bpf(skel->progs.tc_src, skel->progs.tc_dst, skel->progs.tc_chk, setup_result)) goto done; if (!ASSERT_OK(set_forwarding(false), "disable forwarding")) goto done; test_connectivity(); done: if (skel) test_tc_peer__destroy(skel); close_netns(nstoken); } static int tun_open(char *name) { struct ifreq ifr; int fd, err; fd = open("/dev/net/tun", O_RDWR); if (!ASSERT_GE(fd, 0, "open /dev/net/tun")) return -1; memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = IFF_TUN | IFF_NO_PI; if (*name) strncpy(ifr.ifr_name, name, IFNAMSIZ); err = ioctl(fd, TUNSETIFF, &ifr); if (!ASSERT_OK(err, "ioctl TUNSETIFF")) goto fail; SYS(fail, "ip link set dev %s up", name); return fd; fail: close(fd); return -1; } enum { SRC_TO_TARGET = 0, TARGET_TO_SRC = 1, }; static int tun_relay_loop(int src_fd, int target_fd) { fd_set rfds, wfds; FD_ZERO(&rfds); FD_ZERO(&wfds); for (;;) { char buf[1500]; int direction, nread, nwrite; FD_SET(src_fd, &rfds); FD_SET(target_fd, &rfds); if (select(1 + MAX(src_fd, target_fd), &rfds, NULL, NULL, NULL) < 0) { log_err("select failed"); return 1; } direction = FD_ISSET(src_fd, &rfds) ? SRC_TO_TARGET : TARGET_TO_SRC; nread = read(direction == SRC_TO_TARGET ? src_fd : target_fd, buf, sizeof(buf)); if (nread < 0) { log_err("read failed"); return 1; } nwrite = write(direction == SRC_TO_TARGET ? target_fd : src_fd, buf, nread); if (nwrite != nread) { log_err("write failed"); return 1; } } } static void test_tc_redirect_peer_l3(struct netns_setup_result *setup_result) { LIBBPF_OPTS(bpf_tc_hook, qdisc_tun_fwd); LIBBPF_OPTS(bpf_tc_hook, qdisc_veth_dst_fwd); struct test_tc_peer *skel = NULL; struct nstoken *nstoken = NULL; int err; int tunnel_pid = -1; int src_fd, target_fd = -1; int ifindex; /* Start a L3 TUN/TAP tunnel between the src and dst namespaces. * This test is using TUN/TAP instead of e.g. IPIP or GRE tunnel as those * expose the L2 headers encapsulating the IP packet to BPF and hence * don't have skb in suitable state for this test. Alternative to TUN/TAP * would be e.g. Wireguard which would appear as a pure L3 device to BPF, * but that requires much more complicated setup. */ nstoken = open_netns(NS_SRC); if (!ASSERT_OK_PTR(nstoken, "setns " NS_SRC)) return; src_fd = tun_open("tun_src"); if (!ASSERT_GE(src_fd, 0, "tun_open tun_src")) goto fail; close_netns(nstoken); nstoken = open_netns(NS_FWD); if (!ASSERT_OK_PTR(nstoken, "setns " NS_FWD)) goto fail; target_fd = tun_open("tun_fwd"); if (!ASSERT_GE(target_fd, 0, "tun_open tun_fwd")) goto fail; tunnel_pid = fork(); if (!ASSERT_GE(tunnel_pid, 0, "fork tun_relay_loop")) goto fail; if (tunnel_pid == 0) exit(tun_relay_loop(src_fd, target_fd)); skel = test_tc_peer__open(); if (!ASSERT_OK_PTR(skel, "test_tc_peer__open")) goto fail; ifindex = if_nametoindex("tun_fwd"); if (!ASSERT_GT(ifindex, 0, "if_indextoname tun_fwd")) goto fail; skel->rodata->IFINDEX_SRC = ifindex; skel->rodata->IFINDEX_DST = setup_result->ifindex_veth_dst_fwd; err = test_tc_peer__load(skel); if (!ASSERT_OK(err, "test_tc_peer__load")) goto fail; /* Load "tc_src_l3" to the tun_fwd interface to redirect packets * towards dst, and "tc_dst" to redirect packets * and "tc_chk" on veth_dst_fwd to drop non-redirected packets. */ /* tc qdisc add dev tun_fwd clsact */ QDISC_CLSACT_CREATE(&qdisc_tun_fwd, ifindex); /* tc filter add dev tun_fwd ingress bpf da tc_src_l3 */ XGRESS_FILTER_ADD(&qdisc_tun_fwd, BPF_TC_INGRESS, skel->progs.tc_src_l3, 0); /* tc qdisc add dev veth_dst_fwd clsact */ QDISC_CLSACT_CREATE(&qdisc_veth_dst_fwd, setup_result->ifindex_veth_dst_fwd); /* tc filter add dev veth_dst_fwd ingress bpf da tc_dst_l3 */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_INGRESS, skel->progs.tc_dst_l3, 0); /* tc filter add dev veth_dst_fwd egress bpf da tc_chk */ XGRESS_FILTER_ADD(&qdisc_veth_dst_fwd, BPF_TC_EGRESS, skel->progs.tc_chk, 0); /* Setup route and neigh tables */ SYS(fail, "ip -netns " NS_SRC " addr add dev tun_src " IP4_TUN_SRC "/24"); SYS(fail, "ip -netns " NS_FWD " addr add dev tun_fwd " IP4_TUN_FWD "/24"); SYS(fail, "ip -netns " NS_SRC " addr add dev tun_src " IP6_TUN_SRC "/64 nodad"); SYS(fail, "ip -netns " NS_FWD " addr add dev tun_fwd " IP6_TUN_FWD "/64 nodad"); SYS(fail, "ip -netns " NS_SRC " route del " IP4_DST "/32 dev veth_src scope global"); SYS(fail, "ip -netns " NS_SRC " route add " IP4_DST "/32 via " IP4_TUN_FWD " dev tun_src scope global"); SYS(fail, "ip -netns " NS_DST " route add " IP4_TUN_SRC "/32 dev veth_dst scope global"); SYS(fail, "ip -netns " NS_SRC " route del " IP6_DST "/128 dev veth_src scope global"); SYS(fail, "ip -netns " NS_SRC " route add " IP6_DST "/128 via " IP6_TUN_FWD " dev tun_src scope global"); SYS(fail, "ip -netns " NS_DST " route add " IP6_TUN_SRC "/128 dev veth_dst scope global"); SYS(fail, "ip -netns " NS_DST " neigh add " IP4_TUN_SRC " dev veth_dst lladdr " MAC_DST_FWD); SYS(fail, "ip -netns " NS_DST " neigh add " IP6_TUN_SRC " dev veth_dst lladdr " MAC_DST_FWD); if (!ASSERT_OK(set_forwarding(false), "disable forwarding")) goto fail; test_connectivity(); fail: if (tunnel_pid > 0) { kill(tunnel_pid, SIGTERM); waitpid(tunnel_pid, NULL, 0); } if (src_fd >= 0) close(src_fd); if (target_fd >= 0) close(target_fd); if (skel) test_tc_peer__destroy(skel); if (nstoken) close_netns(nstoken); } #define RUN_TEST(name) \ ({ \ struct netns_setup_result setup_result; \ if (test__start_subtest(#name)) \ if (ASSERT_OK(netns_setup_namespaces("add"), "setup namespaces")) { \ if (ASSERT_OK(netns_setup_links_and_routes(&setup_result), \ "setup links and routes")) \ test_ ## name(&setup_result); \ netns_setup_namespaces("delete"); \ } \ }) static void *test_tc_redirect_run_tests(void *arg) { netns_setup_namespaces_nofail("delete"); RUN_TEST(tc_redirect_peer); RUN_TEST(tc_redirect_peer_l3); RUN_TEST(tc_redirect_neigh); RUN_TEST(tc_redirect_neigh_fib); RUN_TEST(tc_redirect_dtime); return NULL; } void test_tc_redirect(void) { pthread_t test_thread; int err; /* Run the tests in their own thread to isolate the namespace changes * so they do not affect the environment of other tests. * (specifically needed because of unshare(CLONE_NEWNS) in open_netns()) */ err = pthread_create(&test_thread, NULL, &test_tc_redirect_run_tests, NULL); if (ASSERT_OK(err, "pthread_create")) ASSERT_OK(pthread_join(test_thread, NULL), "pthread_join"); }