#include <linux/if_tun.h>
#include <linux/limits.h>
#include <linux/sysctl.h>
+#include <linux/time_types.h>
+#include <linux/net_tstamp.h>
#include <sched.h>
#include <stdbool.h>
#include <stdio.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 CHK_PROG_PIN_FILE "/sys/fs/bpf/test_tc_chk"
#define TIMEOUT_MILLIS 10000
+#define NSEC_PER_SEC 1000000000ULL
#define log_err(MSG, ...) \
fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
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)
+{
+ struct nstoken *nstoken;
+
+#define PIN_FNAME(__file) "/sys/fs/bpf/" #__file
+#define PIN(__prog) ({ \
+ int err = bpf_program__pin(skel->progs.__prog, PIN_FNAME(__prog)); \
+ if (!ASSERT_OK(err, "pin " #__prog)) \
+ goto fail; \
+ })
+
+ /* setup ns_src tc progs */
+ nstoken = open_netns(NS_SRC);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS_SRC))
+ return -1;
+ PIN(egress_host);
+ PIN(ingress_host);
+ SYS("tc qdisc add dev veth_src clsact");
+ SYS("tc filter add dev veth_src ingress bpf da object-pinned "
+ PIN_FNAME(ingress_host));
+ SYS("tc filter add dev veth_src egress bpf da object-pinned "
+ PIN_FNAME(egress_host));
+ close_netns(nstoken);
+
+ /* setup ns_dst tc progs */
+ nstoken = open_netns(NS_DST);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS_DST))
+ return -1;
+ PIN(egress_host);
+ PIN(ingress_host);
+ SYS("tc qdisc add dev veth_dst clsact");
+ SYS("tc filter add dev veth_dst ingress bpf da object-pinned "
+ PIN_FNAME(ingress_host));
+ SYS("tc filter add dev veth_dst egress bpf da object-pinned "
+ PIN_FNAME(egress_host));
+ close_netns(nstoken);
+
+ /* setup ns_fwd tc progs */
+ nstoken = open_netns(NS_FWD);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS_FWD))
+ return -1;
+ PIN(ingress_fwdns_prio100);
+ PIN(egress_fwdns_prio100);
+ PIN(ingress_fwdns_prio101);
+ PIN(egress_fwdns_prio101);
+ SYS("tc qdisc add dev veth_dst_fwd clsact");
+ SYS("tc filter add dev veth_dst_fwd ingress prio 100 bpf da object-pinned "
+ PIN_FNAME(ingress_fwdns_prio100));
+ SYS("tc filter add dev veth_dst_fwd ingress prio 101 bpf da object-pinned "
+ PIN_FNAME(ingress_fwdns_prio101));
+ SYS("tc filter add dev veth_dst_fwd egress prio 100 bpf da object-pinned "
+ PIN_FNAME(egress_fwdns_prio100));
+ SYS("tc filter add dev veth_dst_fwd egress prio 101 bpf da object-pinned "
+ PIN_FNAME(egress_fwdns_prio101));
+ SYS("tc qdisc add dev veth_src_fwd clsact");
+ SYS("tc filter add dev veth_src_fwd ingress prio 100 bpf da object-pinned "
+ PIN_FNAME(ingress_fwdns_prio100));
+ SYS("tc filter add dev veth_src_fwd ingress prio 101 bpf da object-pinned "
+ PIN_FNAME(ingress_fwdns_prio101));
+ SYS("tc filter add dev veth_src_fwd egress prio 100 bpf da object-pinned "
+ PIN_FNAME(egress_fwdns_prio100));
+ SYS("tc filter add dev veth_src_fwd egress prio 101 bpf da object-pinned "
+ PIN_FNAME(egress_fwdns_prio101));
+ close_netns(nstoken);
+
+#undef PIN
+
+ return 0;
+
+fail:
+ close_netns(nstoken);
+ return -1;
+}
+
+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, 0);
+
+ 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, 0);
+
+ /* 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, 0);
+
+ 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_P100));
+ 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))
+ 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;
RUN_TEST(tc_redirect_peer_l3);
RUN_TEST(tc_redirect_neigh);
RUN_TEST(tc_redirect_neigh_fib);
+ RUN_TEST(tc_redirect_dtime);
return NULL;
}
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2022 Meta
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <linux/bpf.h>
+#include <linux/stddef.h>
+#include <linux/pkt_cls.h>
+#include <linux/if_ether.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <sys/socket.h>
+
+/* veth_src --- veth_src_fwd --- veth_det_fwd --- veth_dst
+ * | |
+ * ns_src | ns_fwd | ns_dst
+ *
+ * ns_src and ns_dst: ENDHOST namespace
+ * ns_fwd: Fowarding namespace
+ */
+
+#define ctx_ptr(field) (void *)(long)(field)
+
+#define ip4_src __bpf_htonl(0xac100164) /* 172.16.1.100 */
+#define ip4_dst __bpf_htonl(0xac100264) /* 172.16.2.100 */
+
+#define ip6_src { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+ 0x00, 0x01, 0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe }
+#define ip6_dst { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+ 0x00, 0x02, 0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe }
+
+#define v6_equal(a, b) (a.s6_addr32[0] == b.s6_addr32[0] && \
+ a.s6_addr32[1] == b.s6_addr32[1] && \
+ a.s6_addr32[2] == b.s6_addr32[2] && \
+ a.s6_addr32[3] == b.s6_addr32[3])
+
+volatile const __u32 IFINDEX_SRC;
+volatile const __u32 IFINDEX_DST;
+
+#define EGRESS_ENDHOST_MAGIC 0x0b9fbeef
+#define INGRESS_FWDNS_MAGIC 0x1b9fbeef
+#define EGRESS_FWDNS_MAGIC 0x2b9fbeef
+
+enum {
+ INGRESS_FWDNS_P100,
+ INGRESS_FWDNS_P101,
+ EGRESS_FWDNS_P100,
+ EGRESS_FWDNS_P101,
+ INGRESS_ENDHOST,
+ EGRESS_ENDHOST,
+ SET_DTIME,
+ __MAX_CNT,
+};
+
+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,
+};
+
+enum {
+ SRC_NS = 1,
+ DST_NS,
+};
+
+__u32 dtimes[__NR_TESTS][__MAX_CNT] = {};
+__u32 errs[__NR_TESTS][__MAX_CNT] = {};
+__u32 test = 0;
+
+static void inc_dtimes(__u32 idx)
+{
+ if (test < __NR_TESTS)
+ dtimes[test][idx]++;
+ else
+ dtimes[UKN_TEST][idx]++;
+}
+
+static void inc_errs(__u32 idx)
+{
+ if (test < __NR_TESTS)
+ errs[test][idx]++;
+ else
+ errs[UKN_TEST][idx]++;
+}
+
+static int skb_proto(int type)
+{
+ return type & 0xff;
+}
+
+static int skb_ns(int type)
+{
+ return (type >> 8) & 0xff;
+}
+
+static bool fwdns_clear_dtime(void)
+{
+ return test == TCP_IP6_CLEAR_DTIME;
+}
+
+static bool bpf_fwd(void)
+{
+ return test < TCP_IP4_RT_FWD;
+}
+
+/* -1: parse error: TC_ACT_SHOT
+ * 0: not testing traffic: TC_ACT_OK
+ * >0: first byte is the inet_proto, second byte has the netns
+ * of the sender
+ */
+static int skb_get_type(struct __sk_buff *skb)
+{
+ void *data_end = ctx_ptr(skb->data_end);
+ void *data = ctx_ptr(skb->data);
+ __u8 inet_proto = 0, ns = 0;
+ struct ipv6hdr *ip6h;
+ struct iphdr *iph;
+
+ switch (skb->protocol) {
+ case __bpf_htons(ETH_P_IP):
+ iph = data + sizeof(struct ethhdr);
+ if (iph + 1 > data_end)
+ return -1;
+ if (iph->saddr == ip4_src)
+ ns = SRC_NS;
+ else if (iph->saddr == ip4_dst)
+ ns = DST_NS;
+ inet_proto = iph->protocol;
+ break;
+ case __bpf_htons(ETH_P_IPV6):
+ ip6h = data + sizeof(struct ethhdr);
+ if (ip6h + 1 > data_end)
+ return -1;
+ if (v6_equal(ip6h->saddr, (struct in6_addr)ip6_src))
+ ns = SRC_NS;
+ else if (v6_equal(ip6h->saddr, (struct in6_addr)ip6_dst))
+ ns = DST_NS;
+ inet_proto = ip6h->nexthdr;
+ break;
+ default:
+ return 0;
+ }
+
+ if ((inet_proto != IPPROTO_TCP && inet_proto != IPPROTO_UDP) || !ns)
+ return 0;
+
+ return (ns << 8 | inet_proto);
+}
+
+/* format: direction@iface@netns
+ * egress@veth_(src|dst)@ns_(src|dst)
+ */
+SEC("tc")
+int egress_host(struct __sk_buff *skb)
+{
+ int skb_type;
+
+ skb_type = skb_get_type(skb);
+ if (skb_type == -1)
+ return TC_ACT_SHOT;
+ if (!skb_type)
+ return TC_ACT_OK;
+
+ if (skb_proto(skb_type) == IPPROTO_TCP) {
+ if (skb->delivery_time_type == BPF_SKB_DELIVERY_TIME_MONO &&
+ skb->tstamp)
+ inc_dtimes(EGRESS_ENDHOST);
+ else
+ inc_errs(EGRESS_ENDHOST);
+ } else {
+ if (skb->delivery_time_type == BPF_SKB_DELIVERY_TIME_UNSPEC &&
+ skb->tstamp)
+ inc_dtimes(EGRESS_ENDHOST);
+ else
+ inc_errs(EGRESS_ENDHOST);
+ }
+
+ skb->tstamp = EGRESS_ENDHOST_MAGIC;
+
+ return TC_ACT_OK;
+}
+
+/* ingress@veth_(src|dst)@ns_(src|dst) */
+SEC("tc")
+int ingress_host(struct __sk_buff *skb)
+{
+ int skb_type;
+
+ skb_type = skb_get_type(skb);
+ if (skb_type == -1)
+ return TC_ACT_SHOT;
+ if (!skb_type)
+ return TC_ACT_OK;
+
+ if (skb->delivery_time_type == BPF_SKB_DELIVERY_TIME_MONO &&
+ skb->tstamp == EGRESS_FWDNS_MAGIC)
+ inc_dtimes(INGRESS_ENDHOST);
+ else
+ inc_errs(INGRESS_ENDHOST);
+
+ return TC_ACT_OK;
+}
+
+/* ingress@veth_(src|dst)_fwd@ns_fwd priority 100 */
+SEC("tc")
+int ingress_fwdns_prio100(struct __sk_buff *skb)
+{
+ int skb_type;
+
+ skb_type = skb_get_type(skb);
+ if (skb_type == -1)
+ return TC_ACT_SHOT;
+ if (!skb_type)
+ return TC_ACT_OK;
+
+ /* delivery_time is only available to the ingress
+ * if the tc-bpf checks the skb->delivery_time_type.
+ */
+ if (skb->tstamp == EGRESS_ENDHOST_MAGIC)
+ inc_errs(INGRESS_FWDNS_P100);
+
+ if (fwdns_clear_dtime())
+ skb->tstamp = 0;
+
+ return TC_ACT_UNSPEC;
+}
+
+/* egress@veth_(src|dst)_fwd@ns_fwd priority 100 */
+SEC("tc")
+int egress_fwdns_prio100(struct __sk_buff *skb)
+{
+ int skb_type;
+
+ skb_type = skb_get_type(skb);
+ if (skb_type == -1)
+ return TC_ACT_SHOT;
+ if (!skb_type)
+ return TC_ACT_OK;
+
+ /* delivery_time is always available to egress even
+ * the tc-bpf did not use the delivery_time_type.
+ */
+ if (skb->tstamp == INGRESS_FWDNS_MAGIC)
+ inc_dtimes(EGRESS_FWDNS_P100);
+ else
+ inc_errs(EGRESS_FWDNS_P100);
+
+ if (fwdns_clear_dtime())
+ skb->tstamp = 0;
+
+ return TC_ACT_UNSPEC;
+}
+
+/* ingress@veth_(src|dst)_fwd@ns_fwd priority 101 */
+SEC("tc")
+int ingress_fwdns_prio101(struct __sk_buff *skb)
+{
+ __u64 expected_dtime = EGRESS_ENDHOST_MAGIC;
+ int skb_type;
+
+ skb_type = skb_get_type(skb);
+ if (skb_type == -1 || !skb_type)
+ /* Should have handled in prio100 */
+ return TC_ACT_SHOT;
+
+ if (skb_proto(skb_type) == IPPROTO_UDP)
+ expected_dtime = 0;
+
+ if (skb->delivery_time_type) {
+ if (fwdns_clear_dtime() ||
+ skb->delivery_time_type != BPF_SKB_DELIVERY_TIME_MONO ||
+ skb->tstamp != expected_dtime)
+ inc_errs(INGRESS_FWDNS_P101);
+ else
+ inc_dtimes(INGRESS_FWDNS_P101);
+ } else {
+ if (!fwdns_clear_dtime() && expected_dtime)
+ inc_errs(INGRESS_FWDNS_P101);
+ }
+
+ if (skb->delivery_time_type == BPF_SKB_DELIVERY_TIME_MONO) {
+ skb->tstamp = INGRESS_FWDNS_MAGIC;
+ } else {
+ if (bpf_skb_set_delivery_time(skb, INGRESS_FWDNS_MAGIC,
+ BPF_SKB_DELIVERY_TIME_MONO))
+ inc_errs(SET_DTIME);
+ if (!bpf_skb_set_delivery_time(skb, INGRESS_FWDNS_MAGIC,
+ BPF_SKB_DELIVERY_TIME_UNSPEC))
+ inc_errs(SET_DTIME);
+ }
+
+ if (skb_ns(skb_type) == SRC_NS)
+ return bpf_fwd() ?
+ bpf_redirect_neigh(IFINDEX_DST, NULL, 0, 0) : TC_ACT_OK;
+ else
+ return bpf_fwd() ?
+ bpf_redirect_neigh(IFINDEX_SRC, NULL, 0, 0) : TC_ACT_OK;
+}
+
+/* egress@veth_(src|dst)_fwd@ns_fwd priority 101 */
+SEC("tc")
+int egress_fwdns_prio101(struct __sk_buff *skb)
+{
+ int skb_type;
+
+ skb_type = skb_get_type(skb);
+ if (skb_type == -1 || !skb_type)
+ /* Should have handled in prio100 */
+ return TC_ACT_SHOT;
+
+ if (skb->delivery_time_type) {
+ if (fwdns_clear_dtime() ||
+ skb->delivery_time_type != BPF_SKB_DELIVERY_TIME_MONO ||
+ skb->tstamp != INGRESS_FWDNS_MAGIC)
+ inc_errs(EGRESS_FWDNS_P101);
+ else
+ inc_dtimes(EGRESS_FWDNS_P101);
+ } else {
+ if (!fwdns_clear_dtime())
+ inc_errs(EGRESS_FWDNS_P101);
+ }
+
+ if (skb->delivery_time_type == BPF_SKB_DELIVERY_TIME_MONO) {
+ skb->tstamp = EGRESS_FWDNS_MAGIC;
+ } else {
+ if (bpf_skb_set_delivery_time(skb, EGRESS_FWDNS_MAGIC,
+ BPF_SKB_DELIVERY_TIME_MONO))
+ inc_errs(SET_DTIME);
+ if (!bpf_skb_set_delivery_time(skb, EGRESS_FWDNS_MAGIC,
+ BPF_SKB_DELIVERY_TIME_UNSPEC))
+ inc_errs(SET_DTIME);
+ }
+
+ return TC_ACT_OK;
+}
+
+char __license[] SEC("license") = "GPL";
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