@@ -11,14 +11,17 @@
*/
#define _GNU_SOURCE
-#include <fcntl.h>
+
+#include <arpa/inet.h>
#include <linux/limits.h>
#include <linux/sysctl.h>
+#include <linux/if_tun.h>
+#include <linux/if.h>
#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/stat.h>
-#include <sys/types.h>
+#include <sys/mount.h>
#include "test_progs.h"
#include "network_helpers.h"
@@ -32,18 +35,25 @@
#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 "::1:dead:beef:cafe"
-#define IP6_DST "::2:dead:beef:cafe"
+#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 "-c 3 -w 10 -q"
+#define PING_ARGS "-i 0.2 -c 3 -w 10 -q"
#define SRC_PROG_PIN_FILE "/sys/fs/bpf/test_tc_src"
#define DST_PROG_PIN_FILE "/sys/fs/bpf/test_tc_dst"
@@ -51,120 +61,104 @@
#define TIMEOUT_MILLIS 10000
-#define MAX_PROC_MODS 128
-#define MAX_PROC_VALUE_LEN 16
-
#define log_err(MSG, ...) \
fprintf(stderr, "(%s:%d: errno: %s) " MSG "\n", \
__FILE__, __LINE__, strerror(errno), ##__VA_ARGS__)
-struct proc_mod {
- char path[PATH_MAX];
- char oldval[MAX_PROC_VALUE_LEN];
- int oldlen;
-};
-
static const char * const namespaces[] = {NS_SRC, NS_FWD, NS_DST, NULL};
-static int root_netns_fd = -1;
-static int num_proc_mods;
-static struct proc_mod proc_mods[MAX_PROC_MODS];
-/**
- * modify_proc() - Modify entry in /proc
- *
- * Modifies an entry in /proc and saves the original value for later
- * restoration with restore_proc().
- */
-static int modify_proc(const char *path, const char *newval)
+static int write_file(const char *path, const char *newval)
{
- struct proc_mod *mod;
FILE *f;
- if (num_proc_mods + 1 > MAX_PROC_MODS)
- return -1;
-
f = fopen(path, "r+");
if (!f)
return -1;
-
- mod = &proc_mods[num_proc_mods];
- num_proc_mods++;
-
- strncpy(mod->path, path, PATH_MAX);
-
- if (!fread(mod->oldval, 1, MAX_PROC_VALUE_LEN, f)) {
- log_err("reading from %s failed", path);
- goto fail;
- }
- rewind(f);
if (fwrite(newval, strlen(newval), 1, f) != 1) {
log_err("writing to %s failed", path);
- goto fail;
+ fclose(f);
+ return -1;
}
-
fclose(f);
return 0;
-
-fail:
- fclose(f);
- num_proc_mods--;
- return -1;
}
-/**
- * restore_proc() - Restore all /proc modifications
- */
-static void restore_proc(void)
+struct nstoken {
+ int orig_netns_fd;
+};
+
+static int setns_by_fd(int nsfd)
{
- int i;
+ int err;
- for (i = 0; i < num_proc_mods; i++) {
- struct proc_mod *mod = &proc_mods[i];
- FILE *f;
+ err = setns(nsfd, CLONE_NEWNET);
+ close(nsfd);
- f = fopen(mod->path, "w");
- if (!f) {
- log_err("fopen of %s failed", mod->path);
- continue;
- }
+ if (!ASSERT_OK(err, "setns"))
+ return err;
- if (fwrite(mod->oldval, mod->oldlen, 1, f) != 1)
- log_err("fwrite to %s failed", mod->path);
+ /* Switch /sys to the new namespace so that e.g. /sys/class/net
+ * reflects the devices in the new namespace.
+ */
+ err = unshare(CLONE_NEWNS);
+ if (!ASSERT_OK(err, "unshare"))
+ return err;
- fclose(f);
- }
- num_proc_mods = 0;
+ err = umount2("/sys", MNT_DETACH);
+ if (!ASSERT_OK(err, "umount2 /sys"))
+ return err;
+
+ err = mount("sysfs", "/sys", "sysfs", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys"))
+ return err;
+
+ err = mount("bpffs", "/sys/fs/bpf", "bpf", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys/fs/bpf"))
+ return err;
+
+ return 0;
}
/**
- * setns_by_name() - Set networks namespace by name
+ * open_netns() - Switch to specified network namespace by name.
+ *
+ * Returns token with which to restore the original namespace
+ * using close_netns().
*/
-static int setns_by_name(const char *name)
+static struct nstoken *open_netns(const char *name)
{
int nsfd;
char nspath[PATH_MAX];
int err;
+ struct nstoken *token;
+
+ token = malloc(sizeof(struct nstoken));
+ if (!ASSERT_OK_PTR(token, "malloc token"))
+ return NULL;
+
+ token->orig_netns_fd = open("/proc/self/ns/net", O_RDONLY);
+ if (!ASSERT_GE(token->orig_netns_fd, 0, "open /proc/self/ns/net"))
+ goto fail;
snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
- if (nsfd < 0)
- return nsfd;
+ if (!ASSERT_GE(nsfd, 0, "open netns fd"))
+ goto fail;
- err = setns(nsfd, CLONE_NEWNET);
- close(nsfd);
+ err = setns_by_fd(nsfd);
+ if (!ASSERT_OK(err, "setns_by_fd"))
+ goto fail;
- return err;
+ return token;
+fail:
+ free(token);
+ return NULL;
}
-/**
- * setns_root() - Set network namespace to original (root) namespace
- *
- * Not expected to ever fail, so error not returned, but failure logged
- * and test marked as failed.
- */
-static void setns_root(void)
+static void close_netns(struct nstoken *token)
{
- ASSERT_OK(setns(root_netns_fd, CLONE_NEWNET), "setns root");
+ ASSERT_OK(setns_by_fd(token->orig_netns_fd), "setns_by_fd");
+ free(token);
}
static int netns_setup_namespaces(const char *verb)
@@ -237,15 +231,17 @@ static int get_ifindex(const char *name)
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] = {};
- char veth_dst_fwd_addr[IFADDR_STR_LEN+1] = {};
SYS("ip link add veth_src type veth peer name veth_src_fwd");
SYS("ip link add veth_dst type veth peer name veth_dst_fwd");
+
+ SYS("ip link set veth_dst_fwd address " MAC_DST_FWD);
+ SYS("ip link set veth_dst address " MAC_DST);
+
if (get_ifaddr("veth_src_fwd", veth_src_fwd_addr))
goto fail;
- if (get_ifaddr("veth_dst_fwd", veth_dst_fwd_addr))
- goto fail;
result->ifindex_veth_src_fwd = get_ifindex("veth_src_fwd");
if (result->ifindex_veth_src_fwd < 0)
@@ -260,7 +256,8 @@ static int netns_setup_links_and_routes(struct netns_setup_result *result)
SYS("ip link set veth_dst netns " NS_DST);
/** setup in 'src' namespace */
- if (!ASSERT_OK(setns_by_name(NS_SRC), "setns src"))
+ nstoken = open_netns(NS_SRC);
+ if (!ASSERT_OK_PTR(nstoken, "setns src"))
goto fail;
SYS("ip addr add " IP4_SRC "/32 dev veth_src");
@@ -276,8 +273,11 @@ static int netns_setup_links_and_routes(struct netns_setup_result *result)
SYS("ip neigh add " IP6_DST " dev veth_src lladdr %s",
veth_src_fwd_addr);
+ close_netns(nstoken);
+
/** setup in 'fwd' namespace */
- if (!ASSERT_OK(setns_by_name(NS_FWD), "setns fwd"))
+ 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
@@ -294,8 +294,11 @@ static int netns_setup_links_and_routes(struct netns_setup_result *result)
SYS("ip route add " IP4_DST "/32 dev veth_dst_fwd scope global");
SYS("ip route add " IP6_DST "/128 dev veth_dst_fwd scope global");
+ close_netns(nstoken);
+
/** setup in 'dst' namespace */
- if (!ASSERT_OK(setns_by_name(NS_DST), "setns dst"))
+ nstoken = open_netns(NS_DST);
+ if (!ASSERT_OK_PTR(nstoken, "setns dst"))
goto fail;
SYS("ip addr add " IP4_DST "/32 dev veth_dst");
@@ -306,23 +309,20 @@ static int netns_setup_links_and_routes(struct netns_setup_result *result)
SYS("ip route add " IP4_NET "/16 dev veth_dst scope global");
SYS("ip route add " IP6_SRC "/128 dev veth_dst scope global");
- SYS("ip neigh add " IP4_SRC " dev veth_dst lladdr %s",
- veth_dst_fwd_addr);
- SYS("ip neigh add " IP6_SRC " dev veth_dst lladdr %s",
- veth_dst_fwd_addr);
+ SYS("ip neigh add " IP4_SRC " dev veth_dst lladdr " MAC_DST_FWD);
+ SYS("ip neigh add " IP6_SRC " dev veth_dst lladdr " MAC_DST_FWD);
+
+ close_netns(nstoken);
- setns_root();
return 0;
fail:
- setns_root();
+ if (nstoken)
+ close_netns(nstoken);
return -1;
}
static int netns_load_bpf(void)
{
- if (!ASSERT_OK(setns_by_name(NS_FWD), "setns fwd"))
- return -1;
-
SYS("tc qdisc add dev veth_src_fwd clsact");
SYS("tc filter add dev veth_src_fwd ingress bpf da object-pinned "
SRC_PROG_PIN_FILE);
@@ -335,42 +335,29 @@ static int netns_load_bpf(void)
SYS("tc filter add dev veth_dst_fwd egress bpf da object-pinned "
CHK_PROG_PIN_FILE);
- setns_root();
- return -1;
-fail:
- setns_root();
- return -1;
-}
-
-static int netns_unload_bpf(void)
-{
- if (!ASSERT_OK(setns_by_name(NS_FWD), "setns fwd"))
- goto fail;
- SYS("tc qdisc delete dev veth_src_fwd clsact");
- SYS("tc qdisc delete dev veth_dst_fwd clsact");
-
- setns_root();
return 0;
fail:
- setns_root();
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;
- if (!ASSERT_OK(setns_by_name(NS_DST), "setns dst"))
+ 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;
- if (!ASSERT_OK(setns_by_name(NS_SRC), "setns src"))
+ 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);
@@ -392,7 +379,8 @@ static void test_tcp(int family, const char *addr, __u16 port)
ASSERT_EQ(n, sizeof(buf), "recv from server");
done:
- setns_root();
+ if (nstoken)
+ close_netns(nstoken);
if (listen_fd >= 0)
close(listen_fd);
if (accept_fd >= 0)
@@ -405,7 +393,7 @@ static int test_ping(int family, const char *addr)
{
const char *ping = family == AF_INET6 ? "ping6" : "ping";
- SYS("ip netns exec " NS_SRC " %s " PING_ARGS " %s", ping, addr);
+ SYS("ip netns exec " NS_SRC " %s " PING_ARGS " %s > /dev/null", ping, addr);
return 0;
fail:
return -1;
@@ -419,19 +407,37 @@ static void test_connectivity(void)
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 test_tc_redirect_neigh_fib(struct netns_setup_result *setup_result)
{
- struct test_tc_neigh_fib *skel;
+ struct nstoken *nstoken = NULL;
+ struct test_tc_neigh_fib *skel = NULL;
int err;
+ 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"))
- return;
+ goto done;
- if (!ASSERT_OK(test_tc_neigh_fib__load(skel), "test_tc_neigh_fib__load")) {
- test_tc_neigh_fib__destroy(skel);
- return;
- }
+ if (!ASSERT_OK(test_tc_neigh_fib__load(skel), "test_tc_neigh_fib__load"))
+ goto done;
err = bpf_program__pin(skel->progs.tc_src, SRC_PROG_PIN_FILE);
if (!ASSERT_OK(err, "pin " SRC_PROG_PIN_FILE))
@@ -449,46 +455,37 @@ static void test_tc_redirect_neigh_fib(struct netns_setup_result *setup_result)
goto done;
/* bpf_fib_lookup() checks if forwarding is enabled */
- if (!ASSERT_OK(setns_by_name(NS_FWD), "setns fwd"))
+ if (!ASSERT_OK(set_forwarding(true), "enable forwarding"))
goto done;
- err = modify_proc("/proc/sys/net/ipv4/ip_forward", "1");
- if (!ASSERT_OK(err, "set ipv4.ip_forward"))
- goto done;
-
- err = modify_proc("/proc/sys/net/ipv6/conf/all/forwarding", "1");
- if (!ASSERT_OK(err, "set ipv6.forwarding"))
- goto done;
- setns_root();
-
test_connectivity();
+
done:
- bpf_program__unpin(skel->progs.tc_src, SRC_PROG_PIN_FILE);
- bpf_program__unpin(skel->progs.tc_chk, CHK_PROG_PIN_FILE);
- bpf_program__unpin(skel->progs.tc_dst, DST_PROG_PIN_FILE);
- test_tc_neigh_fib__destroy(skel);
- netns_unload_bpf();
- setns_root();
- restore_proc();
+ if (skel)
+ test_tc_neigh_fib__destroy(skel);
+ close_netns(nstoken);
}
static void test_tc_redirect_neigh(struct netns_setup_result *setup_result)
{
- struct test_tc_neigh *skel;
+ 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"))
- return;
+ 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")) {
- test_tc_neigh__destroy(skel);
- return;
- }
+ if (!ASSERT_OK(err, "test_tc_neigh__load"))
+ goto done;
err = bpf_program__pin(skel->progs.tc_src, SRC_PROG_PIN_FILE);
if (!ASSERT_OK(err, "pin " SRC_PROG_PIN_FILE))
@@ -505,34 +502,37 @@ static void test_tc_redirect_neigh(struct netns_setup_result *setup_result)
if (netns_load_bpf())
goto done;
+ if (!ASSERT_OK(set_forwarding(false), "disable forwarding"))
+ goto done;
+
test_connectivity();
done:
- bpf_program__unpin(skel->progs.tc_src, SRC_PROG_PIN_FILE);
- bpf_program__unpin(skel->progs.tc_chk, CHK_PROG_PIN_FILE);
- bpf_program__unpin(skel->progs.tc_dst, DST_PROG_PIN_FILE);
- test_tc_neigh__destroy(skel);
- netns_unload_bpf();
- setns_root();
+ 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"))
- return;
+ 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")) {
- test_tc_peer__destroy(skel);
- return;
- }
+ if (!ASSERT_OK(err, "test_tc_peer__load"))
+ goto done;
err = bpf_program__pin(skel->progs.tc_src, SRC_PROG_PIN_FILE);
if (!ASSERT_OK(err, "pin " SRC_PROG_PIN_FILE))
@@ -549,41 +549,238 @@ static void test_tc_redirect_peer(struct netns_setup_result *setup_result)
if (netns_load_bpf())
goto done;
+ if (!ASSERT_OK(set_forwarding(false), "disable forwarding"))
+ goto done;
+
test_connectivity();
done:
- bpf_program__unpin(skel->progs.tc_src, SRC_PROG_PIN_FILE);
- bpf_program__unpin(skel->progs.tc_chk, CHK_PROG_PIN_FILE);
- bpf_program__unpin(skel->progs.tc_dst, DST_PROG_PIN_FILE);
- test_tc_peer__destroy(skel);
- netns_unload_bpf();
- setns_root();
+ if (skel)
+ test_tc_peer__destroy(skel);
+ close_netns(nstoken);
}
-void test_tc_redirect(void)
+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("ip link set dev %s up", name);
+
+ return fd;
+fail:
+ close(fd);
+ return -1;
+}
+
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+enum {
+ SRC_TO_TARGET = 0,
+ TARGET_TO_SRC = 1,
+};
+
+static int tun_relay_loop(int src_fd, int target_fd)
{
- struct netns_setup_result setup_result;
+ fd_set rfds, wfds;
+
+ FD_ZERO(&rfds);
+ FD_ZERO(&wfds);
- root_netns_fd = open("/proc/self/ns/net", O_RDONLY);
- if (!ASSERT_GE(root_netns_fd, 0, "open /proc/self/ns/net"))
+ 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)
+{
+ struct test_tc_peer *skel = NULL;
+ struct nstoken *nstoken = NULL;
+ int err;
+ int tunnel_pid = -1;
+ int src_fd, target_fd;
+ 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;
- if (netns_setup_namespaces("add"))
- goto done;
+ src_fd = tun_open("tun_src");
+ if (!ASSERT_GE(src_fd, 0, "tun_open tun_src"))
+ goto fail;
- if (netns_setup_links_and_routes(&setup_result))
- goto done;
+ close_netns(nstoken);
+
+ nstoken = open_netns(NS_FWD);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS_FWD))
+ goto fail;
- if (test__start_subtest("tc_redirect_peer"))
- test_tc_redirect_peer(&setup_result);
+ target_fd = tun_open("tun_fwd");
+ if (!ASSERT_GE(target_fd, 0, "tun_open tun_fwd"))
+ goto fail;
- if (test__start_subtest("tc_redirect_neigh"))
- test_tc_redirect_neigh(&setup_result);
+ tunnel_pid = fork();
+ if (!ASSERT_GE(tunnel_pid, 0, "fork tun_relay_loop"))
+ goto fail;
- if (test__start_subtest("tc_redirect_neigh_fib"))
- test_tc_redirect_neigh_fib(&setup_result);
+ if (tunnel_pid == 0)
+ exit(tun_relay_loop(src_fd, target_fd));
-done:
- close(root_netns_fd);
- netns_setup_namespaces("delete");
+ skel = test_tc_peer__open();
+ if (!ASSERT_OK_PTR(skel, "test_tc_peer__open"))
+ goto fail;
+
+ ifindex = get_ifindex("tun_fwd");
+ if (!ASSERT_GE(ifindex, 0, "get_ifindex 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;
+
+ err = bpf_program__pin(skel->progs.tc_src_l3, SRC_PROG_PIN_FILE);
+ if (!ASSERT_OK(err, "pin " SRC_PROG_PIN_FILE))
+ goto fail;
+
+ err = bpf_program__pin(skel->progs.tc_dst_l3, DST_PROG_PIN_FILE);
+ if (!ASSERT_OK(err, "pin " DST_PROG_PIN_FILE))
+ goto fail;
+
+ err = bpf_program__pin(skel->progs.tc_chk, CHK_PROG_PIN_FILE);
+ if (!ASSERT_OK(err, "pin " CHK_PROG_PIN_FILE))
+ 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.
+ */
+ SYS("tc qdisc add dev tun_fwd clsact");
+ SYS("tc filter add dev tun_fwd ingress bpf da object-pinned "
+ SRC_PROG_PIN_FILE);
+
+ SYS("tc qdisc add dev veth_dst_fwd clsact");
+ SYS("tc filter add dev veth_dst_fwd ingress bpf da object-pinned "
+ DST_PROG_PIN_FILE);
+ SYS("tc filter add dev veth_dst_fwd egress bpf da object-pinned "
+ CHK_PROG_PIN_FILE);
+
+ /* Setup route and neigh tables */
+ SYS("ip -netns " NS_SRC " addr add dev tun_src " IP4_TUN_SRC "/24");
+ SYS("ip -netns " NS_FWD " addr add dev tun_fwd " IP4_TUN_FWD "/24");
+
+ SYS("ip -netns " NS_SRC " addr add dev tun_src " IP6_TUN_SRC "/64 nodad");
+ SYS("ip -netns " NS_FWD " addr add dev tun_fwd " IP6_TUN_FWD "/64 nodad");
+
+ SYS("ip -netns " NS_SRC " route del " IP4_DST "/32 dev veth_src scope global");
+ SYS("ip -netns " NS_SRC " route add " IP4_DST "/32 via " IP4_TUN_FWD
+ " dev tun_src scope global");
+ SYS("ip -netns " NS_DST " route add " IP4_TUN_SRC "/32 dev veth_dst scope global");
+ SYS("ip -netns " NS_SRC " route del " IP6_DST "/128 dev veth_src scope global");
+ SYS("ip -netns " NS_SRC " route add " IP6_DST "/128 via " IP6_TUN_FWD
+ " dev tun_src scope global");
+ SYS("ip -netns " NS_DST " route add " IP6_TUN_SRC "/128 dev veth_dst scope global");
+
+ SYS("ip -netns " NS_DST " neigh add " IP4_TUN_SRC " dev veth_dst lladdr " MAC_DST_FWD);
+ SYS("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)
+{
+ RUN_TEST(tc_redirect_peer);
+ RUN_TEST(tc_redirect_peer_l3);
+ RUN_TEST(tc_redirect_neigh);
+ RUN_TEST(tc_redirect_neigh_fib);
+ 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");
+}
+
@@ -5,12 +5,17 @@
#include <linux/bpf.h>
#include <linux/stddef.h>
#include <linux/pkt_cls.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
#include <bpf/bpf_helpers.h>
volatile const __u32 IFINDEX_SRC;
volatile const __u32 IFINDEX_DST;
+static const __u8 src_mac[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55};
+static const __u8 dst_mac[] = {0x00, 0x22, 0x33, 0x44, 0x55, 0x66};
+
SEC("classifier/chk_egress")
int tc_chk(struct __sk_buff *skb)
{
@@ -29,4 +34,30 @@ int tc_src(struct __sk_buff *skb)
return bpf_redirect_peer(IFINDEX_DST, 0);
}
+SEC("classifier/dst_ingress_l3")
+int tc_dst_l3(struct __sk_buff *skb)
+{
+ return bpf_redirect(IFINDEX_SRC, 0);
+}
+
+SEC("classifier/src_ingress_l3")
+int tc_src_l3(struct __sk_buff *skb)
+{
+ __u16 proto = skb->protocol;
+
+ if (bpf_skb_change_head(skb, ETH_HLEN, 0) != 0)
+ return TC_ACT_SHOT;
+
+ if (bpf_skb_store_bytes(skb, 0, &src_mac, ETH_ALEN, 0) != 0)
+ return TC_ACT_SHOT;
+
+ if (bpf_skb_store_bytes(skb, ETH_ALEN, &dst_mac, ETH_ALEN, 0) != 0)
+ return TC_ACT_SHOT;
+
+ if (bpf_skb_store_bytes(skb, ETH_ALEN + ETH_ALEN, &proto, sizeof(__u16), 0) != 0)
+ return TC_ACT_SHOT;
+
+ return bpf_redirect_peer(IFINDEX_DST, 0);
+}
+
char __license[] SEC("license") = "GPL";
Add a test case for using bpf_skb_change_head in combination with bpf_redirect_peer to redirect a packet from a L3 device to veth and back. The test uses a BPF program that adds L2 headers to the packet coming from a L3 device and then calls bpf_redirect_peer to redirect the packet to a veth device. The test fails as skb->mac_len is not set properly and thus the ethernet headers are not properly skb_pull'd in cls_bpf_classify, causing tcp_v4_rcv to point the TCP header into middle of the IP header. Signed-off-by: Jussi Maki <joamaki@gmail.com> --- .../selftests/bpf/prog_tests/tc_redirect.c | 553 ++++++++++++------ .../selftests/bpf/progs/test_tc_peer.c | 31 + 2 files changed, 406 insertions(+), 178 deletions(-)